CN115290342B - Agricultural wheeled tractor security performance test system - Google Patents

Abstract

The invention discloses a safety performance test system of an agricultural wheeled tractor, which comprises a pavement test system and a vehicle-mounted test system; the pavement testing system comprises a testing pavement, a testing control cabinet, a speed testing subsystem, a noise testing subsystem and a brake testing subsystem; the vehicle-mounted test system comprises a test control terminal and two trigger mechanisms. The safety performance testing system utilizes the testing control cabinet to coordinate and control the speed testing subsystem, the noise testing subsystem and the brake testing subsystem, and meanwhile, the safety performance testing system is in wireless communication with the testing control terminal, can interact with a driver, and achieves automatic centralized detection of speed, noise, braking distance and jolt road vibration of the agricultural wheeled tractor, and has high testing efficiency and accuracy.

Description

Agricultural wheeled tractor security performance test system

Technical Field

The invention relates to a safety performance testing system, in particular to a safety performance testing system for an agricultural wheeled tractor.

Background

Aiming at the safety performance requirement of the tractor in the popularization and identification of agricultural machinery, the noise, the acceleration, the highest speed per hour and the braking of the agricultural wheeled tractor are required to be tested. However, the existing test methods are all single-item detection, and each test item is scattered, so that the test efficiency is low. Therefore, it is necessary to design a safety performance test system for the agricultural wheeled tractor, which can perform centralized test on multiple performances of the agricultural wheeled tractor and effectively improve the test efficiency.

Disclosure of Invention

The invention aims to: the safety performance testing system for the agricultural wheeled tractor can be used for carrying out centralized testing on multiple performances of the agricultural wheeled tractor, and can effectively improve testing efficiency.

The technical scheme is as follows: the invention relates to a safety performance test system of an agricultural wheeled tractor, which comprises a pavement test system and a vehicle-mounted test system;

the pavement testing system comprises a testing pavement, a testing control cabinet, a speed testing subsystem, a noise testing subsystem and a brake testing subsystem; the vehicle-mounted test system comprises a test control terminal and two trigger mechanisms;

a running test area and a bump test area are arranged on the test pavement; the driving test area comprises a strip-shaped travel-out area and a strip-shaped return-in area, and road surface parameters of the travel-out area and the return-in area are consistent; undulating and bumpy protrusions are distributed on the bumpy test area; the bump test area, the trip area and the return area are transversely arranged in parallel; the speed test subsystem comprises a plurality of speed test units, and each speed test unit is arranged in the travel-out area and the return area at intervals and is used for measuring the running speed of the agricultural wheeled tractor at each position; the noise testing subsystem comprises various noise testing units, wherein the various noise testing units are arranged between the forward travel area and the return travel area and are used for measuring the noise of the agricultural wheeled tractor on the forward travel area and the return travel area in real time; the braking test subsystem is arranged between the travel-out area and the return area and is used for measuring the braking distance of the agricultural wheeled tractor on the travel-out area and the return area; the test control cabinet is electrically connected with the speed test subsystem, the noise test subsystem and the brake test subsystem respectively;

The two trigger mechanisms are respectively detachably arranged on an accelerator pedal and a brake pedal of the agricultural wheeled tractor and are used for respectively acquiring an accelerator pedal signal and a brake pedal signal; the test control terminal is electrically connected with the two trigger mechanisms and is used for testing the running acceleration, the cab noise and the vehicle body vibration of the agricultural wheeled tractor; the test control cabinet is in wireless communication connection with the test control terminal, and the test control terminal plays a test prompt tone.

Further, the test control cabinet is provided with a main controller, a main memory and a main wireless communication module; the main controller is electrically connected with the main memory and the main wireless communication module respectively; the test control terminal comprises a terminal shell, a start-stop button, a loudspeaker and an on-board noise sensor; a slave controller, a slave memory, an acceleration sensor, a vibration sensor and a slave wireless communication module are arranged in the terminal shell; the starting and stopping button, the loudspeaker and the vehicle-mounted noise sensor are all arranged on the terminal shell, and the slave controller is respectively and electrically connected with the starting and stopping button, the loudspeaker, the vehicle-mounted noise sensor, the slave memory, the acceleration sensor, the vibration sensor and the slave wireless communication module; the master wireless communication module is in wireless communication with the slave wireless communication module.

Further, a position detection mechanism is longitudinally arranged at the starting and stopping positions of the bump test area, the trip area and the return area and is used for detecting the running direction and the in-out position of the agricultural wheeled tractor; the test control cabinet is electrically connected with each position detection mechanism.

Further, the position detection mechanism comprises a strip-shaped supporting seat, four centering laser ranging sensors and each strip-shaped pressing plate; the strip-shaped supporting seat is longitudinally embedded into a test pavement at a corresponding position, each strip-shaped plugboard groove is formed in the strip-shaped supporting seat at intervals, and each strip-shaped pressing plate is transversely inserted into each strip-shaped plugboard groove; a limiting sleeve is vertically arranged at the center of the bottom of each strip-shaped plugboard groove, a limiting upright post is movably inserted on the limiting sleeve, and the upper end of the limiting upright post is hinged and installed in the middle of the lower side edge of the strip-shaped pressing plate; a middle supporting spring is sleeved on the limiting sleeve, and the middle supporting spring is elastically supported between the lower side edge of the strip-shaped pressing plate and the bottom of the strip-shaped plugboard groove; longitudinal distance measuring holes are longitudinally and penetratingly formed in the left side edge and the right side edge of the strip-shaped supporting seat; a flat cavity of the plugboard is vertically arranged in the strip-shaped supporting seat and positioned at the left side and the right side of each strip-shaped plugboard groove, and a baffle plugboard is vertically movably arranged in the flat cavity of the plugboard; the bottom of the flat cavity of the plugboard is provided with a rebound pressure spring which is elastically supported on the lower side edge of the baffle plugboard; a side layering which extends into the strip-shaped plugboard groove is arranged on the side edge of the baffle plugboard; the two ends of the lower side edge of the strip-shaped pressing plate are pressed on the two side edge pressing strips; two movable limit grooves are formed on the edges of the front side groove and the rear side groove of the strip-shaped plugboard groove, and movable limit posts extending into the movable limit grooves at the corresponding positions are formed at the two end positions of the front side surface and the rear side surface of the strip-shaped pressing plate; two distance measurement through holes are formed in the middle of each baffle plugboard and located at the longitudinal distance measurement holes, so that two distance measurement channels are formed in the left side and the right side of the strip-shaped supporting seat; the four centering laser ranging sensors are respectively and closely arranged at four orifices of the two longitudinal ranging holes, ranging beams of the four centering laser ranging sensors are respectively and longitudinally shot into the four ranging channels, and the ranging beams are blocked after the baffle plugboards at the corresponding positions are downwards moved; four laser rangefinder sensors placed in middle all are connected with test control cabinet electricity.

Further, the triggering mechanism comprises a treading triggering box, a triggering pressure sensor, two constraint driving mechanisms and four constraint steel wire ropes; a trigger window is arranged at the top of the treading trigger box, a trigger pressure sensor is arranged in the trigger window, and a treading panel protruding out of the trigger window is arranged on the sensing end of the trigger pressure sensor; two binding driving mechanisms are arranged in the middle of the left side edge and the right side edge of the treading trigger box; one end of each of the four binding steel wire ropes is respectively arranged at four vertex angles of the treading trigger box, and the other ends of the four binding steel wire ropes are respectively pulled and locked by two binding driving mechanisms; the test control terminal is electrically connected with the trigger pressure sensor.

Further, the binding driving mechanism comprises a binding driving worm, a binding driving worm wheel, a binding driving shaft and two binding reels; the binding driving worm wheel and the two binding reels are coaxially and fixedly arranged on the binding driving shaft, a winding cavity is formed in the middle of the left side edge and the right side edge of the stepping triggering box, the binding driving shaft is rotatably arranged on the stepping triggering box, and the binding driving worm wheel and the two binding reels are both positioned in the winding cavity; the constraint driving worm is rotatably arranged in the winding cavity, and the constraint driving worm wheel is meshed with the constraint driving worm; the end part of the constraint driving worm extends out of the trampling trigger box, and a rotating head is arranged on the extending end; the end part of the binding steel wire rope penetrates through the winding cavity extending into the corresponding side and is wound and fixed on the corresponding binding reel.

Further, the speed testing unit comprises a strip bottom shell, a speed measuring radar, a cantilever rod, an anti-collision rod and an elastic supporting mechanism; the strip-shaped bottom shell is transversely embedded and arranged on a test pavement at a corresponding position; one end of the cantilever rod is hinged in one end of the strip-shaped bottom shell, and the speed measuring radar is arranged at the other end of the cantilever rod; the elastic supporting mechanism is arranged on the inner bottom of the strip-shaped bottom shell and is used for elastically pushing the middle part of the cantilever rod so that the speed measuring radar extends out of the strip-shaped bottom shell; the anti-collision rod is longitudinally and fixedly arranged on the cantilever rod, and is close to the cantilever rotating shaft; the side shell which is convenient for the anti-collision rod to sink is communicated with the side of the strip-shaped bottom shell.

Further, the elastic supporting mechanism comprises a columnar shell, an elastic supporting column, a piston disc and a piston spring; the upper end of the elastic support column vertically penetrates through the top center of the columnar shell in a movable mode, and a hinge notch is formed in the upper end of the elastic support column; a hinged short shaft is arranged on the inner side groove edge of the hinged notch; a hinged chute is arranged on the cantilever rod along the length direction of the cantilever rod; the hinged notch is buckled on the cantilever rod, and the end part of the hinged short shaft stretches into the hinged chute in a sliding manner; the piston disc is movably and horizontally arranged in the columnar shell, and a piston sealing ring which is tightly attached to the inner wall of the columnar shell is arranged on the circumferential edge of the piston disc; the lower end of the elastic support column is fixedly arranged at the center of the piston disc in a penetrating way, and a spring mounting hole is formed in the lower end of the elastic support column; the upper end of the piston spring is fixedly arranged in the spring mounting hole, and the lower end of the piston spring is supported on the inner wall of the bottom of the columnar shell; a plurality of exhaust check valves are arranged on the piston disc and are used for exhausting air upwards in a one-way when the piston disc is pressed down; and the piston disc is also provided with an air return hole, and the aperture of the air return hole is smaller than the exhaust aperture of the exhaust one-way valve.

Further, the brake test subsystem comprises a sliding rail, two position sensors, a transverse sliding mechanism, a rotary supporting mechanism, a swinging driving mechanism, a position adjusting mechanism and a brake laser ranging sensor;

the two position sensors are respectively arranged at the positions of the starting points of the brake tests in the going-away area and the return area; the sliding rail is transversely arranged between the travel-out area and the return area, and the transverse sliding mechanism is movably arranged on the sliding rail; the rotary supporting mechanism is arranged on the transverse sliding mechanism, and is driven by the transverse sliding mechanism to transversely move along the sliding track; the swing driving mechanism is arranged on the rotary supporting mechanism, and is driven by the rotary supporting mechanism to horizontally rotate, so that the swing driving mechanism extends into the going-away area or the return area; the position adjusting mechanism is arranged on the swing driving mechanism, and the swing driving mechanism drives the position adjusting mechanism to swing up and down to adjust the height; the brake laser ranging sensor is arranged on the position adjusting mechanism, and the position of the brake laser ranging sensor on the swing driving mechanism is adjusted by the position adjusting mechanism; the brake laser ranging sensor and the two position sensors are electrically connected with the test control cabinet.

Further, the transverse sliding mechanism comprises a transverse sliding seat and a sliding driving motor; the rotary supporting mechanism comprises a rotary supporting column and a rotary driving motor; the swing driving mechanism comprises a swing driving motor and a swing driving shaft; the position adjusting mechanism comprises a translation supporting rod, a translation supporting seat and a translation driving motor;

a roller supporting groove is transversely formed in the front side surface and the rear side surface of the sliding rail; the lower side surface of the transverse sliding seat is transversely provided with a buckling chute, and a plurality of supporting rollers which support and walk in the corresponding side roller supporting grooves are rotatably arranged on the edges of the front side groove and the rear side groove of the buckling chute; a sliding driving rack is transversely arranged on the sliding rail, a sliding driving motor is fixedly arranged on the transverse sliding seat, and a sliding driving gear meshed with the sliding driving rack is arranged on the sliding driving motor; a rotary supporting seat is fixedly arranged on the upper side surface of the transverse sliding seat, and the lower end of the rotary supporting column is rotatably arranged on the rotary supporting seat; a rotary driving worm wheel is fixedly arranged at the lower end of the rotary supporting column, and a rotary driving worm meshed with the rotary driving worm wheel is rotatably arranged on the side edge of the transverse sliding seat; the rotary driving motor drives the rotary driving worm to rotate; a gear box is fixedly arranged at the upper end of the rotary support column; the swing driving shaft is transversely arranged in the gear box in a rotating way, and one end of the swing driving shaft extends out and is fixed on one end of the translation supporting rod; a swing driving worm wheel is fixedly arranged on the swing driving shaft, and a swing driving worm meshed with the swing driving worm wheel is rotatably arranged in the gear box; the swing driving motor is fixedly arranged on the gear box and used for driving the swing driving worm to rotate; the translation supporting seat is slidably arranged on the translation supporting rod, and a translation driving rack is arranged on the translation supporting rod along the length direction of the translation supporting rod; the translation driving motor is fixedly arranged on the translation supporting seat, and a translation driving gear meshed with the translation driving rack is arranged on an output shaft of the translation driving motor; the brake laser ranging sensor is fixedly arranged on the translation supporting seat; the sliding driving motor, the rotating driving motor, the swinging driving motor and the translation driving motor are all driven and controlled by the test control cabinet.

Compared with the prior art, the invention has the beneficial effects that: the speed test subsystem, the noise test subsystem and the brake test subsystem can be coordinated and controlled by the test control cabinet, and meanwhile, the speed test subsystem, the noise test subsystem and the brake test subsystem are in wireless communication with the test control terminal, and can interact with a driver, so that the automatic centralized detection of the speed, the noise, the brake distance and the vibration of a bumpy road surface of the agricultural wheeled tractor is realized, and the test efficiency and the accuracy are high; by using the arrangement of the travel-out area and the return-back area, the test can be realized twice, and the reliability of the test is ensured; the corresponding pedal can be triggered and detected by the triggering mechanism, so that the detection record of the operation action of the driver is realized, and the smooth proceeding of the test process is ensured.

Drawings

FIG. 1 is a schematic diagram of the overall top view of the pavement testing system of the present invention;

FIG. 2 is a schematic diagram of a vehicle test system according to the present invention;

FIG. 3 is a schematic view of a binding driving mechanism according to the present invention;

FIG. 4 is a schematic top view of a position detecting mechanism according to the present invention;

FIG. 5 is a schematic view of a position detection mechanism of the present invention in partial cross-section;

FIG. 6 is a schematic diagram of a brake testing subsystem of the present invention in partial cross-section;

FIG. 7 is a schematic top view of a speed testing unit according to the present invention;

FIG. 8 is a schematic view of a speed test unit of the present invention in partial cross-section;

FIG. 9 is a schematic view of a partially cut-away structure of the elastic support mechanism of the present invention;

FIG. 10 is a schematic view of the top structure of the cylindrical housing of the present invention;

fig. 11 is a schematic diagram of a system circuit structure according to the present invention.

Detailed Description

The technical scheme of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1 to 11, the system for testing the safety performance of the agricultural wheeled tractor provided by the invention comprises: the road surface test system and the vehicle-mounted test system;

the pavement testing system comprises a testing pavement 1, a testing control cabinet 2, a speed testing subsystem, a noise testing subsystem and a brake testing subsystem; the vehicle-mounted test system comprises a test control terminal and two trigger mechanisms;

a running test area 90 and a bump test area 8 are arranged on the test pavement 1; the driving test area 90 comprises a strip-shaped travel-out area and a strip-shaped return area, and the road surface parameters of the travel-out area and the return area are consistent; undulating bump protrusions 30 are distributed on the bump test area 8; the bump test area 8, the trip area and the return area are transversely arranged in parallel; the speed test subsystem comprises a plurality of speed test units, and each speed test unit is arranged in the travel-out area and the return area at intervals and is used for measuring the running speed of the agricultural wheeled tractor at each position; the noise testing subsystem comprises various noise testing units, wherein the various noise testing units are arranged between the forward travel area and the return travel area and are used for measuring the noise of the agricultural wheeled tractor on the forward travel area and the return travel area in real time; the braking test subsystem is arranged between the travel-out area and the return area and is used for measuring the braking distance of the agricultural wheeled tractor on the travel-out area and the return area; the test control cabinet 2 is electrically connected with the speed test subsystem, the noise test subsystem and the brake test subsystem respectively;

The two trigger mechanisms are respectively detachably arranged on an accelerator pedal and a brake pedal of the agricultural wheeled tractor and are used for respectively acquiring an accelerator pedal signal and a brake pedal signal; the test control terminal is electrically connected with the two trigger mechanisms and is used for testing the running acceleration, the cab noise and the vehicle body vibration of the agricultural wheeled tractor; the test control cabinet 2 is in wireless communication connection with the test control terminal, and the test control terminal plays a test prompt tone.

The speed test subsystem, the noise test subsystem and the brake test subsystem can be coordinated and controlled by the test control cabinet 2, and meanwhile, the speed test subsystem, the noise test subsystem and the brake test subsystem are in wireless communication with the test control terminal, so that interaction with a driver can be realized, and the automatic centralized detection of the speed, the noise, the brake distance and the vibration of a bumpy road surface of the agricultural wheeled tractor is realized, so that the test efficiency is high and the accuracy is high; by using the arrangement of the travel-out area and the return-back area, the test can be realized twice, and the reliability of the test is ensured; the corresponding pedal can be triggered and detected by the triggering mechanism, so that the detection record of the operation action of the driver is realized, and the smooth proceeding of the test process is ensured.

Further, the test control cabinet 2 is provided with a main controller, a main memory and a main wireless communication module; the main controller is electrically connected with the main memory and the main wireless communication module respectively; the test control terminal comprises a terminal shell 55, a start-stop button 56, a loudspeaker 58, a vehicle-mounted noise sensor 43 and an indicator lamp 57; a slave controller, a slave memory, an acceleration sensor, a vibration sensor, and a slave wireless communication module are provided in the terminal housing 55; the start-stop button 56, the loudspeaker 58, the vehicle-mounted noise sensor 43 and the indicator lamp 57 are all arranged on the terminal shell 55, and the slave controller is respectively and electrically connected with the start-stop button 56, the loudspeaker 58, the vehicle-mounted noise sensor 43, the indicator lamp 57, the slave memory, the acceleration sensor, the vibration sensor and the slave wireless communication module; the master wireless communication module is in wireless communication with the slave wireless communication module.

Cab noise can be measured by the vehicle-mounted noise sensor 43, flickering prompt can be carried out in the cab by the indicator lamp 57, running acceleration of the agricultural wheeled tractor can be detected by the acceleration sensor, and vehicle body vibration of the agricultural wheeled tractor can be detected by the vibration sensor; voice prompts can be provided by means of a speaker 58.

Further, a position detection mechanism is longitudinally arranged at the starting and stopping positions of the bump test area 8, the travel-out area and the return-in area and is used for detecting the traveling direction and the in-out position of the agricultural wheeled tractor; the test control cabinet 2 is electrically connected with each position detection mechanism.

The running direction and the in-out position of the agricultural wheeled tractor can be detected by using the position detection mechanism, so that the reliable test process is ensured.

Further, the position detection mechanism comprises a strip-shaped supporting seat 3, four centering laser ranging sensors 10 and each strip-shaped pressing plate 12; the strip-shaped supporting seat 3 is longitudinally embedded in the test pavement 1 at a corresponding position, each strip-shaped plugboard groove 11 is arranged on the strip-shaped supporting seat 3 at intervals, each strip-shaped pressing plate 12 is transversely inserted in each strip-shaped plugboard groove 11, and two ends of the upper side edge of each strip-shaped pressing plate 12 are provided with arc-shaped slope surfaces 13; a limiting sleeve 17 is vertically arranged at the center of the bottom of each strip-shaped plugboard groove 11, a limiting upright post 16 is movably inserted on the limiting sleeve 17, and the upper end of the limiting upright post 16 is hinged and installed in the middle of the lower side edge of the strip-shaped pressing plate 12; a middle supporting spring 18 is sleeved on the limit sleeve 17, and the middle supporting spring 18 is elastically supported between the lower side edge of the strip-shaped pressing plate 12 and the bottom of the strip-shaped plugboard groove 11; longitudinal distance measuring holes 27 are longitudinally and penetratingly arranged on the left side edge and the right side edge of the strip-shaped supporting seat 3; a flat flashboard cavity 19 is vertically arranged in the strip-shaped supporting seat 3 and positioned at the left side and the right side of each strip flashboard groove 11, and a baffle flashboard 20 is vertically movably arranged in the flat flashboard cavity 19; a rebound pressure spring 24 which is elastically supported on the lower side edge of the baffle plugboard 20 is arranged at the bottom of the plugboard flat cavity 19, and the elasticity of the rebound pressure spring 24 is smaller than that of the middle supporting spring 18; a strip-shaped communication hole 25 is arranged between the flat cavity 19 of the inserting plate and the end part of the strip-shaped inserting plate groove 11, and a side layering 21 which extends into the strip-shaped inserting plate groove 11 from the strip-shaped communication hole 25 is arranged on the side edge of the baffle inserting plate 20; the upper side of the side pressing strip 21 is provided with wear-resistant gaskets 28, two ends of the lower side of the strip-shaped pressing plate 12 are pressed on the two side pressing strips 21 through the two wear-resistant gaskets 28, and two ends of the lower side of the strip-shaped pressing plate 12 are provided with arc chamfers 14; two movable limit grooves 26 are arranged on the front and rear side groove edges of the strip-shaped plugboard groove 11, and movable limit posts 15 which extend into the movable limit grooves 26 at corresponding positions are arranged at the two end positions of the front and rear side surfaces of the strip-shaped pressing plate 12; the front and rear side cavity walls of the flashboard flat cavity 19 are vertically provided with flashboard guide sliding grooves 23, and the front and rear side surfaces of the lower part of the baffle flashboard 20 are respectively provided with a flashboard guide block 22 which is slidably embedded into the flashboard guide sliding grooves 23; two ranging through holes 88 are arranged at the middle part of each baffle insert plate 20 and at the longitudinal ranging holes 27, so that two ranging channels are formed at the left side and the right side of the strip-shaped supporting seat 3; the four centering laser ranging sensors 10 are respectively and closely arranged at four orifices of the two longitudinal ranging holes 27, and ranging beams of the four centering laser ranging sensors 10 are respectively and longitudinally shot into four ranging channels and block the ranging beams after the baffle plugboards 20 at corresponding positions are downwards moved; four centering laser ranging sensors 10 are all electrically connected with the main controller of the test control cabinet 2.

By arranging the two distance measurement through holes 88 on the baffle plugboard 20, the test light of the centering laser distance measurement sensor 10 can be blocked when the baffle plugboard 20 is pressed down, the distance of the pressed baffle plugboard 20 is detected by the centering laser distance measurement sensor 10, and the measurement results of the two centering laser distance measurement sensors 10 corresponding to each other in front and back are compared and calculated, so that the distance of the agricultural wheeled tractor deviated from the central line of the area can be judged, and the centering running detection of the agricultural wheeled tractor is realized; the elastic supporting point can be formed at the middle position by utilizing the limiting sleeve 17, the limiting upright post 16 and the middle supporting spring 18 which are arranged at the middle part of the strip-shaped pressing plate 12, when one end of the strip-shaped pressing plate 12 is pressed down, the other end can be slightly lifted up without pressing down the side pressing bar 21 at the corresponding position, so that the time of data change of the two pairs of centering laser ranging sensors 10 at the left side and the right side has a sequence relationship, and the running direction of the agricultural wheeled tractor can be conveniently judged; the bar-shaped pressing plate 12 can be movably limited by utilizing the matching of the movable limiting groove 26 and the movable limiting column 15, but the up-and-down movement and the left-and-right slight shaking are not influenced; the stability of lifting and lowering of the baffle insert plate 20 can be enhanced by the cooperation of the insert plate guide chute 23 and the insert plate guide block 22.

Further, the triggering mechanism comprises a treading triggering box 59, a triggering pressure sensor, two constraint driving mechanisms and four constraint steel wire ropes 62; a trigger window 61 is arranged at the top of the treading trigger box 59, a trigger pressure sensor is arranged in the trigger window 61, and a treading panel 60 protruding out of the trigger window 61 is arranged on the sensing end of the trigger pressure sensor; two binding driving mechanisms are installed in the middle of the left and right sides of the tread trigger box 59; one end of each of the four binding steel wire ropes 62 is respectively arranged at four vertex angles of the stepping trigger box 59, and the other ends of the four binding steel wire ropes are respectively pulled and locked by two binding driving mechanisms; the test control terminal is electrically connected with the trigger pressure sensor.

Whether the driver presses the corresponding pedal or not can be sensed in real time by utilizing the trigger pressure sensor, so that the driving operation of the driver is tracked and collected.

Further, the binding driving mechanism includes a binding driving worm 65, a binding driving worm wheel 66, a binding driving shaft 63, and two binding reels 67; the binding driving worm gear 66 and the two binding reels 67 are coaxially and fixedly arranged on the binding driving shaft 63, a winding cavity is formed in the middle of the left side edge and the right side edge of the stepping trigger box 59, the binding driving shaft 63 is rotatably arranged on the stepping trigger box 59, and the binding driving worm gear 66 and the two binding reels 67 are both positioned in the winding cavity; the constraint driving worm 65 is rotatably arranged in the winding cavity, and the constraint driving worm gear 66 is meshed with the constraint driving worm 65; the end of the binding driving worm 65 extends out of the stepping trigger box 59, and a rotating head 64 is arranged on the extending end; the end of the binding wire 62 extends through the winding cavity on the corresponding side and is wound and fixed on the corresponding binding reel 67.

Utilize constraint drive worm wheel 66 and constraint drive worm 65's cooperation, can realize constraint reel 67's rotary drive and location to realize constraint wire rope 62's tightening up constraint, also can be convenient for release constraint wire rope 62, realize four constraint wire rope 62 demountable installation in four apex angles department of corresponding footboard of constraint actuating mechanism.

Further, the speed testing unit comprises a strip bottom shell 9, a speed measuring radar 71, a cantilever rod 70, an anti-collision rod 80 and an elastic supporting mechanism; the strip-shaped bottom shell 9 is transversely embedded and arranged on the test pavement 1 at the corresponding position; one end of the cantilever rod 70 is hinged in one end of the strip-shaped bottom shell 9 through a cantilever rotating shaft 69, and a speed measuring radar 71 is arranged on the other end of the cantilever rod 70 through a connecting short rod 72; the elastic supporting mechanism is arranged on the inner bottom of the strip-shaped bottom shell 9 and is used for elastically pushing the middle part of the cantilever rod 70 so that the speed measuring radar 71 horizontally extends out of the strip-shaped bottom shell 9; the anti-collision rod 80 is longitudinally and fixedly arranged on the cantilever rod 70, and the anti-collision rod 80 is close to the cantilever rotating shaft 69; a side shell 68 which is convenient for the anti-collision rod 80 to sink into is communicated with the side of the strip-shaped bottom shell 9; a pressing slope 81 is provided on the upper side of the anti-collision bar 80; a water collecting tank 73 is arranged at the bottom of the strip-shaped bottom shell 9, and a drain hole 74 is communicated with the side edge of the water collecting tank 73; the speed measuring radar 71 is electrically connected with the main controller of the test control cabinet 2.

The tyre of the agricultural wheeled tractor can be pressed in a certain longitudinal range by utilizing the longitudinally arranged anti-collision rod 80, so that the agricultural wheeled tractor can be pressed and swung into the strip-shaped bottom shell 9 when the agricultural wheeled tractor does not run to the speed measuring radar 71, and mechanical anti-collision is realized, and the agricultural wheeled tractor is safe and reliable; the pressing slope 81 can play a role of buffering when the tire is pressed; by the arrangement of the water collection tank 73 and the drain hole 74, accumulated water in the strip-shaped bottom case 9 can be rapidly discharged in a rainy day.

Further, the elastic support mechanism includes a columnar housing 75, an elastic support column 76, a piston disc 82, and a piston spring 83; the upper ends of elastomeric support columns 76 extend vertically movably through the top center of columnar housing 75 and are provided with hinge slots 77 at the upper ends of elastomeric support columns 76; a hinge stub shaft 78 is provided on the inner slot side of the hinge slot 77; a hinge chute 79 is provided on the cantilever lever 70 along the length direction thereof; the hinge notch 77 is snapped onto the cantilever lever 70, and the end of the hinge stub shaft 78 slidably extends into the hinge runner 79; the piston disc 82 is movably and horizontally arranged in the columnar shell 75, and a piston sealing ring 84 which is closely attached to the inner wall of the columnar shell 75 is arranged on the circumferential edge of the piston disc 82; the lower end of elastomeric support column 76 is fixedly mounted through the center of piston disc 82 and is provided with a spring mounting hole 87 on the lower end of elastomeric support column 76; the upper end of the piston spring 83 is fixedly installed in the spring installation hole 87, and the lower end is supported on the bottom inner wall of the columnar housing 75; a plurality of air discharge check valves 86 are provided on the piston disc 82 for upwardly and unidirectionally discharging air when the piston disc 82 is depressed; an air return hole 85 is further formed in the piston disc 82, and the aperture of the air return hole 85 is smaller than the air discharge aperture of the air discharge check valve 86.

By means of the arrangement that the aperture of the air return hole 85 is smaller than that of the air exhaust one-way valve 86, the air can be quickly recycled into the strip-shaped bottom shell 9 when the cantilever 70 is pressed down, and can slowly rise to a recovery lifting state under the support of the piston spring 83, so that collision to the speed measuring radar 71 is avoided when the agricultural wheeled tractor deviates from the center, and the speed measuring radar 71 can be slowly lifted to a detection state after the agricultural wheeled tractor deviates from the center, so that next detection is facilitated; the cooperation of the hinge short shaft 78 and the hinge sliding groove 79 can realize the pressing driving without influencing the vertical state of the elastic support column 76; the sealing properties of the edges can be enhanced by the piston seal 84.

Further, the noise test subsystem comprises each noise test unit; the noise testing unit comprises a mounting base plate 7, an L-shaped bracket 5 and an environmental noise sensor 6; the lower end of a vertical rod of the L-shaped bracket 5 is fixedly arranged on the mounting bottom plate 7, and the environmental noise sensor 6 is fixedly arranged at the tail end of a horizontal rod of the L-shaped bracket 5; the mounting bottom plates 7 of the noise test units are arranged between the travel-out area and the return area at intervals, and the tail ends of the horizontal rods of the L-shaped brackets 5 are overhung and extend to the upper part of the edges of the travel-out area or the return area; each of the environmental noise sensors 6 is electrically connected with the main controller of the test control cabinet 2.

The noise detection can be carried out on the agricultural wheeled tractor in the travel-out area and the return-in area by utilizing the environment noise sensors 6 arranged at intervals, the maximum value of the noise can be taken as a final measurement result, and the noise test requirement of the agricultural wheeled tractor is met.

Further, the brake test subsystem comprises a sliding rail 31, two position sensors 4, a transverse sliding mechanism, a rotary supporting mechanism, a swinging driving mechanism, a position adjusting mechanism and a brake laser ranging sensor 49;

the two position sensors 4 are respectively arranged at the positions of the starting points of the brake test in the going-away area and the return area; the sliding rail 31 is transversely arranged between the travel-out area and the return area, and the transverse sliding mechanism is movably arranged on the sliding rail 31; the rotary supporting mechanism is arranged on the transverse sliding mechanism, and is driven by the transverse sliding mechanism to transversely move along the sliding rail 31; the swing driving mechanism is arranged on the rotary supporting mechanism, and is driven by the rotary supporting mechanism to horizontally rotate, so that the swing driving mechanism extends into the going-away area or the return area; the position adjusting mechanism is arranged on the swing driving mechanism, and the swing driving mechanism drives the position adjusting mechanism to swing up and down to adjust the height; the brake laser ranging sensor 49 is arranged on the position adjusting mechanism, and the position of the brake laser ranging sensor 49 on the swing driving mechanism is adjusted by the position adjusting mechanism; the brake laser ranging sensor 49 and the two position sensors 4 are electrically connected with the main controller of the test control cabinet 2.

The position sensor 4 is utilized to detect the position of the agricultural wheeled tractor, and relevant control of the braking distance test is started after the position is reached, so that the accuracy and the automatic control performance of the braking test are improved.

Further, the lateral sliding mechanism comprises a lateral sliding seat 37 and a sliding driving motor 34; the rotation support mechanism includes a rotation support column 39, a rotation drive motor 41; the swing drive mechanism includes a swing drive motor 29 and a swing drive shaft 46; the position adjusting mechanism comprises a translation supporting rod 52, a translation supporting seat 48 and a translation driving motor 50;

a roller support groove 32 is transversely arranged on the front side surface and the rear side surface of the sliding rail 31; a buckling chute is transversely arranged on the lower side surface of the transverse sliding seat 37, and a plurality of supporting rollers 36 which support and walk in the corresponding side roller supporting grooves 32 are rotatably arranged on the front side groove edge and the rear side groove edge of the buckling chute; a sliding driving rack 33 is transversely arranged on the sliding rail 31, a sliding driving motor 34 is fixedly arranged on a transverse sliding seat 37, and a sliding driving gear 35 meshed with the sliding driving rack 33 is arranged on the sliding driving motor 34; a rotary supporting seat 38 is fixedly arranged on the upper side surface of the transverse sliding seat 37, and the lower end of a rotary supporting column 39 is rotatably arranged on the rotary supporting seat 38; a rotary driving worm wheel 54 is fixedly arranged at the lower end of the rotary supporting column 39, a rotary driving worm 42 meshed with the rotary driving worm wheel 54 is rotatably arranged on the side edge of the transverse sliding seat 37, and a stable and reliable driving and positioning effect can be achieved by utilizing a worm wheel and worm structure; the rotation driving motor 41 drives the rotation driving worm 42 to rotate; the protective cover 40 is arranged on the transverse sliding seat 37, and the rotary driving motor 41, the rotary driving worm wheel 54 and the rotary driving worm 42 are all positioned in the protective cover 40, so that the safety protection function is realized; a gear case 44 is fixedly provided on the upper end of the rotary support column 39; the swing drive shaft 46 is rotatably and transversely mounted in the gear box 44, and one end of the swing drive shaft 46 extends out and is fixed to one end of the translation support bar 52; a swing driving worm wheel 47 is fixedly arranged on the swing driving shaft 46, a swing driving worm 45 meshed with the swing driving worm wheel 47 is rotatably arranged in the gear box 44, and a stable and reliable driving and positioning effect can be achieved by utilizing a worm wheel and worm structure; the swing driving motor 29 is fixedly arranged on the gear box 44 and is used for driving the swing driving worm 45 to rotate; the translation supporting seat 48 is slidably mounted on the translation supporting rod 52, and a translation driving rack 53 is arranged on the translation supporting rod 52 along the length direction thereof; the translation driving motor 50 is fixedly arranged on the translation supporting seat 48, and a translation driving gear 51 meshed with a translation driving rack 53 is arranged on an output shaft of the translation driving motor 50; the brake laser ranging sensor 49 is fixedly arranged on the translation supporting seat 48; the slide driving motor 34, the rotation driving motor 41, the swing driving motor 29 and the translation driving motor 50 are all driven and controlled by the test control cabinet 2, specifically, a main controller is electrically connected with the slide driving circuit, the rotation driving circuit, the swing driving circuit and the translation driving circuit respectively, and the slide driving circuit, the rotation driving circuit, the swing driving circuit and the translation driving circuit are electrically connected with the slide driving motor 34, the rotation driving motor 41, the swing driving motor 29 and the translation driving motor 50 respectively.

The brake test subsystem can be moved from the right end to the left end by utilizing the transverse sliding mechanism, so that the brake distance of the return region can be tested after the brake distance test of the travel region is finished, the sharing of the systems is realized, and the cost of the systems is reduced; the swing driving mechanism can be horizontally driven in a rotating manner by utilizing the rotating supporting mechanism, so that the translation supporting rod 52 is rotated into a corresponding area after the left end and the right end are moved; the height and the front and back positions of the braking laser ranging sensor 49 can be adjusted by utilizing the cooperation of the swing driving mechanism and the position adjusting mechanism, so that the braking ranging requirements of agricultural wheeled tractors with different sizes can be met; by the cooperation of the supporting roller 36 and the roller supporting groove 32, stable sliding of the transverse sliding seat 37 on the sliding rail 31 can be realized, and sliding resistance can be reduced.

In the agricultural wheeled tractor safety performance test system disclosed by the invention, the main controller and the auxiliary controller both adopt the existing singlechip control module, so that the coordination control of the system can be realized; the main memory and the slave memory are all existing memory modules and are used for storing data required by the operation of the system; the master wireless communication module and the slave wireless communication module adopt the existing wireless communication modules, so that wireless communication can be realized, such as a WiFi module or a 5G module and the like; the environmental noise sensor 6 and the vehicle-mounted noise sensor 43 are both existing digital noise sensors; the speaker 58 adopts the existing speaker module, and can broadcast prompt tone; the indicator lamp 57 adopts the existing LED indicator lamp; the acceleration sensor adopts the existing acceleration sensor and is used for detecting the acceleration information of the agricultural wheeled tractor; the vibration sensor adopts the existing digital vibration sensor and is used for detecting vibration data when the agricultural wheeled tractor runs; the triggering pressure sensor adopts the existing pressure sensor and is used for detecting a trampling pressure signal when a driver tramples; the centering laser ranging sensor 10 and the braking laser ranging sensor 49 are all existing digital laser ranging sensors; the position sensor 4 adopts the existing infrared geminate-transistor position sensor and is used for detecting whether the agricultural wheeled tractor passes through the detection position; the speed measuring radar 71 adopts the existing ultrasonic speed measuring radar and is used for detecting the real-time running speed of the agricultural wheeled tractor; the slip driving circuit, the rotation driving circuit, the swing driving circuit and the translation driving circuit all adopt the existing motor driving circuit for respectively driving the slip driving motor 34, the rotation driving motor 41, the swing driving motor 29 and the translation driving motor 50 in forward and reverse rotation.

When the agricultural wheeled tractor safety performance testing system disclosed by the invention works, firstly, a detector determines the central detection position of the braking laser ranging sensor 49 according to the model of the agricultural wheeled tractor, so that the central position of the braking laser ranging sensor 49 is regulated through the swing driving mechanism and the position regulating mechanism, and the agricultural wheeled tractor can be detected in a certain area; then, a noise test, a brake test and a speed test are performed in the driving test area 90, and then, a vibration test is performed in the bump test area 8;

the driver drives the agricultural wheeled tractor to the left side of the central position of the travel area of the travel test area 90, then presses the start-stop button 56, at this time, a prompt tone of 'please step on the accelerator and travel transversely along the central position of the travel area' is played from the controller through the loudspeaker 58, and when the agricultural wheeled tractor passes through the position detection mechanism at the starting point, as the tire is pressed to the bar-shaped pressing plate 12 at the corresponding position and is pressed from the left end to the right end of the bar-shaped pressing plate 12, the baffle insert plate 20 at the corresponding position can block the detection light of the central laser ranging sensor 10 in a dislocation manner;

If the driving direction of the driver is forward, the two central laser ranging sensors 10 on the left side of the starting point position detect the change of the measured distance first, and the two central laser ranging sensors 10 on the right side detect the change of the measured distance later; judging the longitudinal position of the agricultural wheeled tractor according to the measurement distances of the two centering laser ranging sensors 10 on the same side, judging whether the agricultural wheeled tractor runs at the centering position of the travel-out area by a main controller, for example, the measurement results of the two centering laser ranging sensors 10 on the left side and the front and rear side are respectively 1.6 meters and 2.2 meters, judging that the agricultural wheeled tractor deviates from the center line by 0.3 meter, judging that the agricultural wheeled tractor deviates from the center line by 0.2 meter according to the set deviation threshold value, sending a command through wireless communication, and controlling a loudspeaker 58 to send a prompting voice of 'deviating from the center and requesting centering adjustment' according to a guiding arrow by a slave controller;

if the driving direction of the driver is reverse, the two central laser ranging sensors 10 on the right side of the starting point position detect the change of the measured distance first, the two central laser ranging sensors 10 on the left side detect the change of the measured distance later, at this time, the main controller judges that the agricultural wheeled tractor is in reverse driving, and sends an instruction through wireless communication, the slave controller controls the loudspeaker 58 to send a 'reverse driving warning, please turn the direction immediately' prompting voice, and the indicator lamp 57 blinks to remind;

When the driving direction of the driver is forward and the value deviating from the central line is smaller than 0.2 m from the threshold value, the main controller sends an instruction through wireless communication, the slave controller controls the loudspeaker 58 to send out prompt voice of 'please step on the accelerator and control the vehicle speed to be 40 km/h', meanwhile, the trigger pressure sensor of the trigger mechanism fixed on the accelerator pedal detects whether to detect the stepping pressure exceeding the stepping pressure threshold value, the stepping pressure threshold value is measured in advance, and the accelerator pedal is judged to be stepped on only if the stepping pressure threshold value is larger than the stepping pressure threshold value, and the prompt voice is stopped after the slave controller judges that the accelerator pedal is stepped on;

the speed measuring radar 71 of each speed testing unit is used for measuring the speed of the agricultural wheeled tractor, and meanwhile, the main controller is used for collecting noise data detected by each environmental noise sensor 6, cab noise collected by the vehicle-mounted noise sensor 43 and real-time acceleration of the agricultural wheeled tractor collected by the acceleration sensor and vehicle body vibration data collected by the vibration sensor;

after the position sensor 4 detects that the agricultural wheeled tractor reaches the position, the main controller sends an instruction through wireless communication, the slave controller controls the loudspeaker 58 to send a voice prompt of requesting braking, meanwhile, the trigger pressure sensor of the trigger mechanism fixed on the brake pedal detects whether to detect the stepping pressure exceeding a stepping pressure threshold, the stepping pressure threshold is measured in advance, the brake pedal is judged to be stepped down only when the stepping pressure threshold is larger than the stepping pressure threshold, after the slave controller judges that the brake pedal is stepped down, the prompt voice is stopped, the brake information is sent to the main controller, at the moment, the brake laser ranging sensor 49 records the starting point distance data, and then when the brake laser ranging sensor 49 acquires the data unchanged, the main controller records the final measured value when the brake laser ranging sensor 49 does not change, and the brake distance data can be obtained by subtracting the final measured value from the starting point distance data;

After the position detection mechanism at the right end of the forward travel area detects that the agricultural wheeled tractor drives away, the agricultural wheeled tractor is turned by a driver to enter from the right end of the return area, and the measurement process on the similar forward travel area is repeated;

after the test in the travel-out area and the return-in area is finished, the driver runs to the bump test area 8 to perform vibration test, the centering measurement and the direction determination of the position detection mechanism are similar to those described above, after the driver presses the start-stop button 56, the controller controls the loudspeaker 58 to send out prompt voice of 'please step on the accelerator and control the vehicle speed to be 20 km/h', meanwhile, the triggering pressure sensor of the triggering mechanism fixed on the accelerator pedal detects whether to detect the stepping pressure exceeding the stepping pressure threshold value, after the controller judges that the vehicle is stepped on, the prompt voice is stopped, the driver increases the speed of the agricultural wheeled tractor to 20km/h and keeps the speed, and the vehicle noise collected by the vehicle-mounted noise sensor 43, the real-time acceleration of the agricultural wheeled tractor collected by the acceleration sensor and the vehicle body vibration data collected by the vibration sensor are collected by the controller;

after the detection is completed, the slave controller sends detection data to the master controller through wireless communication, and the master controller uploads all detection data to the control center through a wired network so as to be convenient for detection personnel to observe.

As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides an agricultural wheeled tractor security performance test system which characterized in that: the system comprises a pavement testing system and a vehicle-mounted testing system;

the pavement testing system comprises a testing pavement (1), a testing control cabinet (2), a speed testing subsystem, a noise testing subsystem and a brake testing subsystem; the vehicle-mounted test system comprises a test control terminal and two trigger mechanisms;

a driving test area (90) and a bump test area (8) are arranged on the test pavement (1); the driving test area (90) comprises a strip-shaped travel-out area and a strip-shaped return area, and road surface parameters of the travel-out area and the return area are consistent; undulating and bumpy protrusions (30) are distributed on the bumpy test area (8); the bump test area (8), the trip area and the return area are transversely arranged in parallel; the speed test subsystem comprises a plurality of speed test units, and each speed test unit is arranged in the travel-out area and the return area at intervals and is used for measuring the running speed of the agricultural wheeled tractor at each position; the noise testing subsystem comprises various noise testing units, wherein the various noise testing units are arranged between the forward travel area and the return travel area and are used for measuring the noise of the agricultural wheeled tractor on the forward travel area and the return travel area in real time; the braking test subsystem is arranged between the travel-out area and the return area and is used for measuring the braking distance of the agricultural wheeled tractor on the travel-out area and the return area; the test control cabinet (2) is electrically connected with the speed test subsystem, the noise test subsystem and the brake test subsystem respectively;

The two trigger mechanisms are respectively detachably arranged on an accelerator pedal and a brake pedal of the agricultural wheeled tractor and are used for respectively acquiring an accelerator pedal signal and a brake pedal signal; the test control terminal is electrically connected with the two trigger mechanisms and is used for testing the running acceleration, the cab noise and the vehicle body vibration of the agricultural wheeled tractor; the test control cabinet (2) is in wireless communication connection with the test control terminal, and the test control terminal plays a test prompt tone.

2. The agricultural wheeled tractor safety performance testing system of claim 1, wherein: the test control cabinet (2) is provided with a main controller, a main memory and a main wireless communication module; the main controller is electrically connected with the main memory and the main wireless communication module respectively; the test control terminal comprises a terminal shell (55), a start-stop button (56), a loudspeaker (58) and a vehicle-mounted noise sensor (43); a slave controller, a slave memory, an acceleration sensor, a vibration sensor, and a slave wireless communication module are provided in the terminal housing (55); the start-stop button (56), the loudspeaker (58) and the vehicle-mounted noise sensor (43) are all arranged on the terminal shell (55), and the slave controller is respectively and electrically connected with the start-stop button (56), the loudspeaker (58), the vehicle-mounted noise sensor (43), the slave memory, the acceleration sensor, the vibration sensor and the slave wireless communication module; the master wireless communication module is in wireless communication with the slave wireless communication module.

3. The agricultural wheeled tractor safety performance testing system of claim 1, wherein: a position detection mechanism is longitudinally arranged at the starting and stopping positions of the bump test area (8), the travel-out area and the return-in area and is used for detecting the traveling direction and the in-out position of the agricultural wheeled tractor; the test control cabinet (2) is electrically connected with each position detection mechanism.

4. The agricultural wheeled tractor safety performance testing system of claim 3, wherein: the position detection mechanism comprises a strip-shaped supporting seat (3), four centering laser ranging sensors (10) and each strip-shaped pressing plate (12); the strip-shaped supporting seat (3) is longitudinally embedded into the test pavement (1) at the corresponding position, each strip-shaped plugboard groove (11) is arranged on the strip-shaped supporting seat (3) at intervals, and each strip-shaped pressing plate (12) is transversely inserted into each strip-shaped plugboard groove (11); a limiting sleeve (17) is vertically arranged at the center of the bottom of each strip-shaped plugboard groove (11), a limiting upright post (16) is movably inserted on the limiting sleeve (17), and the upper end of the limiting upright post (16) is hinged and installed in the middle of the lower side edge of the strip-shaped pressing plate (12); a middle supporting spring (18) is sleeved on the limit sleeve (17), and the middle supporting spring (18) is elastically supported between the lower side edge of the strip-shaped pressing plate (12) and the bottom of the strip-shaped plugboard groove (11); longitudinal distance measuring holes (27) are longitudinally and penetratingly formed in the left side edge and the right side edge of the strip-shaped supporting seat (3); a plugboard flat cavity (19) is vertically arranged in the strip-shaped supporting seat (3) and positioned at the left side and the right side of each strip-shaped plugboard groove (11), and a baffle plugboard (20) is vertically and movably arranged in the plugboard flat cavity (19); a rebound compression spring (24) which is elastically supported on the lower side edge of the baffle plugboard (20) is arranged at the bottom of the plugboard flat cavity (19); a side layering (21) extending into the strip-shaped plugboard groove (11) is arranged on the side edge of the baffle plugboard (20); the two ends of the lower side edge of the strip-shaped pressing plate (12) are pressed on the two side edge pressing strips (21); two movable limit grooves (26) are formed on the edges of the front side and the rear side of the strip-shaped plugboard groove (11), and movable limit columns (15) extending into the movable limit grooves (26) at the corresponding positions are formed at the two end positions of the front side and the rear side of the strip-shaped pressing plate (12); two ranging through holes (88) are formed in the middle of each baffle plugboard (20) and located at the longitudinal ranging holes (27), so that two ranging channels are formed on the left side and the right side of the strip-shaped supporting seat (3); the four centering laser ranging sensors (10) are respectively and closely arranged at four orifices of the two longitudinal ranging holes (27), and ranging beams of the four centering laser ranging sensors (10) are respectively and longitudinally injected into the four ranging channels and blocked after the baffle plugboards (20) at corresponding positions are downwards moved; four centering laser ranging sensors (10) are electrically connected with the test control cabinet (2).

5. The agricultural wheeled tractor safety performance testing system of claim 1, wherein: the triggering mechanism comprises a treading triggering box (59), a triggering pressure sensor, two constraint driving mechanisms and four constraint steel wire ropes (62); a trigger window (61) is arranged at the top of the treading trigger box (59), a trigger pressure sensor is arranged in the trigger window (61), and a treading panel (60) protruding out of the trigger window (61) is arranged at the sensing end of the trigger pressure sensor; the two binding driving mechanisms are arranged in the middle of the left side edge and the right side edge of the treading trigger box (59); one end of each of the four binding steel wire ropes (62) is respectively arranged at four vertex angles of the treading trigger box (59), and the other ends of the four binding steel wire ropes are respectively pulled and locked by two binding driving mechanisms; the test control terminal is electrically connected with the trigger pressure sensor.

6. The agricultural wheeled tractor safety performance testing system of claim 5, wherein: the binding driving mechanism comprises a binding driving worm (65), a binding driving worm wheel (66), a binding driving shaft (63) and two binding reels (67); the binding driving worm wheel (66) and the two binding reels (67) are coaxially and fixedly arranged on the binding driving shaft (63), a winding cavity is formed in the middle of the left side edge and the right side edge of the stepping triggering box (59), the binding driving shaft (63) is rotatably arranged on the stepping triggering box (59), and the binding driving worm wheel (66) and the two binding reels (67) are both positioned in the winding cavity; the constraint driving worm (65) is rotatably arranged in the winding cavity, and the constraint driving worm wheel (66) is meshed with the constraint driving worm (65); the end part of the binding driving worm (65) extends out of the treading trigger box (59), and a rotating head (64) is arranged on the extending end; the end of the binding wire rope (62) penetrates through the winding cavity on the corresponding side and is wound and fixed on the corresponding binding reel (67).

7. The agricultural wheeled tractor safety performance testing system of claim 1, wherein: the speed testing unit comprises a strip bottom shell (9), a speed measuring radar (71), a cantilever rod (70), an anti-collision rod (80) and an elastic supporting mechanism; the strip-shaped bottom shell (9) is transversely embedded into the test pavement (1) at the corresponding position; one end of the cantilever rod (70) is hinged in one end of the strip-shaped bottom shell (9), and the speed measuring radar (71) is arranged at the other end of the cantilever rod (70); the elastic supporting mechanism is arranged on the inner bottom of the strip-shaped bottom shell (9) and is used for elastically pushing the middle part of the cantilever rod (70) to enable the speed measuring radar (71) to extend out of the strip-shaped bottom shell (9); the anti-collision rod (80) is longitudinally and fixedly arranged on the cantilever rod (70), and the anti-collision rod (80) is close to the cantilever rotating shaft (69); the side edge of the strip-shaped bottom shell (9) is communicated with a side edge shell (68) which is convenient for the anti-collision rod (80) to sink into.

8. The agricultural wheeled tractor safety performance testing system of claim 7, wherein: the elastic supporting mechanism comprises a columnar shell (75), an elastic supporting column (76), a piston disc (82) and a piston spring (83); the upper ends of the elastic support columns (76) vertically movably penetrate through the top center of the columnar shell (75), and hinge notches (77) are formed in the upper ends of the elastic support columns (76); a hinge short shaft (78) is arranged on the inner side groove edge of the hinge notch (77); a hinged chute (79) is arranged on the cantilever lever (70) along the length direction thereof; the hinge notch (77) is buckled on the cantilever rod (70), and the end part of the hinge short shaft (78) stretches into the hinge chute (79) in a sliding manner; the piston disc (82) is movably and horizontally arranged in the columnar shell (75), and a piston sealing ring (84) which is closely attached to the inner wall of the columnar shell (75) is arranged on the circumferential edge of the piston disc (82); the lower end of the elastic support column (76) is fixedly arranged at the center of the piston disc (82) in a penetrating way, and a spring mounting hole (87) is arranged on the lower end of the elastic support column (76); the upper end of the piston spring (83) is fixedly arranged in the spring mounting hole (87), and the lower end of the piston spring is supported on the inner wall of the bottom of the columnar shell (75); a plurality of exhaust check valves (86) are arranged on the piston disc (82) and are used for exhausting air upwards in a one-way when the piston disc (82) is pressed down; and the piston disc (82) is also provided with an air return hole (85), and the aperture of the air return hole (85) is smaller than the exhaust aperture of the exhaust one-way valve (86).

9. The agricultural wheeled tractor safety performance testing system of claim 1, wherein: the brake test subsystem comprises a sliding rail (31), two position sensors (4), a transverse sliding mechanism, a rotary supporting mechanism, a swinging driving mechanism, a position adjusting mechanism and a brake laser ranging sensor (49);

two position sensors (4) are respectively arranged at the positions of the starting points of the brake tests in the going-away area and the return area; the sliding rail (31) is transversely arranged between the travel-out area and the return area, and the transverse sliding mechanism is movably arranged on the sliding rail (31); the rotary supporting mechanism is arranged on the transverse sliding mechanism, and is driven by the transverse sliding mechanism to transversely move along the sliding rail (31); the swing driving mechanism is arranged on the rotary supporting mechanism, and is driven by the rotary supporting mechanism to horizontally rotate, so that the swing driving mechanism extends into the going-away area or the return area; the position adjusting mechanism is arranged on the swing driving mechanism, and the swing driving mechanism drives the position adjusting mechanism to swing up and down to adjust the height; the brake laser ranging sensor (49) is arranged on the position adjusting mechanism, and the position of the brake laser ranging sensor (49) on the swing driving mechanism is adjusted by the position adjusting mechanism; the brake laser ranging sensor (49) and the two position sensors (4) are electrically connected with the test control cabinet (2).

10. The agricultural wheeled tractor safety performance testing system of claim 9, wherein: the transverse sliding mechanism comprises a transverse sliding seat (37) and a sliding driving motor (34); the rotary supporting mechanism comprises a rotary supporting column (39) and a rotary driving motor (41); the swing driving mechanism comprises a swing driving motor (29) and a swing driving shaft (46); the position adjusting mechanism comprises a translation supporting rod (52), a translation supporting seat (48) and a translation driving motor (50);

a roller supporting groove (32) is transversely arranged on the front side surface and the rear side surface of the sliding rail (31); a buckling chute is transversely arranged on the lower side surface of the transverse sliding seat (37), and a plurality of supporting rollers (36) which support and walk in the corresponding side roller supporting grooves (32) are rotatably arranged on the edges of the front side groove and the rear side groove of the buckling chute; a sliding driving rack (33) is transversely arranged on the sliding rail (31), a sliding driving motor (34) is fixedly arranged on a transverse sliding seat (37), and a sliding driving gear (35) meshed with the sliding driving rack (33) is arranged on the sliding driving motor (34); a rotary supporting seat (38) is fixedly arranged on the upper side surface of the transverse sliding seat (37), and the lower end of a rotary supporting column (39) is rotatably arranged on the rotary supporting seat (38); a rotary driving worm wheel (54) is fixedly arranged at the lower end of the rotary supporting column (39), and a rotary driving worm (42) meshed with the rotary driving worm wheel (54) is rotatably arranged on the side edge of the transverse sliding seat (37); the rotation driving motor (41) drives the rotation driving worm (42) to rotate; a gear box (44) is fixedly arranged at the upper end of the rotary support column (39); the swing driving shaft (46) is transversely arranged in the gear box (44) in a rotating mode, and one end of the swing driving shaft (46) extends out and is fixed on one end of the translation supporting rod (52); a swing drive worm wheel (47) is fixedly arranged on the swing drive shaft (46), and a swing drive worm (45) meshed with the swing drive worm wheel (47) is rotatably arranged in the gear box (44); the swing driving motor (29) is fixedly arranged on the gear box (44) and is used for driving the swing driving worm (45) to rotate; the translation supporting seat (48) is slidably arranged on the translation supporting rod (52), and a translation driving rack (53) is arranged on the translation supporting rod (52) along the length direction of the translation supporting rod; the translation driving motor (50) is fixedly arranged on the translation supporting seat (48), and a translation driving gear (51) meshed with the translation driving rack (53) is arranged on an output shaft of the translation driving motor (50); the brake laser ranging sensor (49) is fixedly arranged on the translation supporting seat (48); the sliding driving motor (34), the rotating driving motor (41), the swinging driving motor (29) and the translation driving motor (50) are all driven and controlled by the test control cabinet (2).