CN211178990U - Mining four-wheel drive braking system detection equipment - Google Patents
Mining four-wheel drive braking system detection equipment Download PDFInfo
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- CN211178990U CN211178990U CN202020102960.XU CN202020102960U CN211178990U CN 211178990 U CN211178990 U CN 211178990U CN 202020102960 U CN202020102960 U CN 202020102960U CN 211178990 U CN211178990 U CN 211178990U
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Abstract
The utility model discloses a mining four-wheel drive braking system check out test set, including detecting roller set, free roller set, lifting device, hydraulic platform, electrical system and data processor. The free roller groups are respectively arranged in front of and behind the detection roller group; a lifting device is respectively arranged between the front roller and the rear roller of each group of detection roller groups and free roller groups; a hydraulic platform is respectively arranged below each group of detection roller groups and free roller groups, and the data processor is used for storing the detection process; the electric control system is used for driving the hydraulic platform to move. The utility model discloses combine the practical application environment and the power transmission characteristic of mining car, can accurately detect the brake force of mining car.
Description
Technical Field
The utility model relates to a mining four-wheel drive performance detects technical field, especially relates to a mining four-wheel drive braking system check out test set.
Background
The braking performance of an automobile refers to the ability of the automobile to stop in a short time while traveling and to maintain the stability of the traveling direction and to maintain a constant vehicle speed on a long downhill. The braking performance of the automobile directly influences the driving safety. Therefore, the method has important practical significance for accurately detecting the braking performance of the vehicle.
At present, a single-shaft counter-force type braking force detection table is generally adopted when the braking performance of an automobile is detected, and the experiment table can only detect the braking performance of a single-shaft driving automobile. Because of the unique power transmission system of the mining four-wheel drive vehicle and the special environment (the channel is used inside, the mining four-wheel drive vehicle is always in an up-down slope state, the slope is long, the slope is large, and the road is rugged), if the existing single-shaft reaction type braking force detection platform is used for detection, when the detection wheel is driven to rotate by a roller of the single-shaft reaction type braking force detection platform, the non-detection wheel can rotate along with the detection wheel. And the existing detection platform can not simulate the actual application environment of the mining vehicle, and the detection result has great deviation.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model aims to provide a four driving car braking system check out test set for mine, this equipment can combine the practical application environment and the power transmission characteristic of mining car, accurately detects the brake force of mining car.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize.
Technical scheme one
A detection device for a four-wheel drive vehicle braking system for a mine comprises a detection roller set, a free roller set, a lifting device, a hydraulic platform, an electric control system and a data processor.
The detection roller sets comprise a left detection roller set and a right detection roller set, each detection roller set comprises a front detection roller and a rear detection roller, and the detection roller sets are used for driving wheels of a detected vehicle to rotate so as to detect the retardation of the wheels;
the free roller groups are respectively arranged in front of and behind the detection roller group along the advancing direction of the vehicle; the free roller groups are provided with a plurality of groups, and each free roller group comprises a front free roller and a rear free roller;
the lifting devices are multiple, and one lifting device is respectively arranged between the front roller and the rear roller of each group of detection roller groups and each group of free roller groups; the lifting device is used for enabling the tested vehicle to stably enter and exit the brake test bed;
the number of the hydraulic platforms is multiple; a hydraulic platform is arranged below each group of detection roller groups and is used for controlling the detection roller groups to move up and down; a hydraulic platform is arranged below each free roller group and is used for controlling the free roller groups to move up and down and move back and forth;
the data processor is used for storing the detection process; and the electric control system is used for respectively driving the hydraulic platforms to move according to the output of the data processor.
The utility model discloses technical scheme one's characteristics lie in with further improvement:
preferably, at least 2 free roller sets are arranged in front of the detection roller set.
Preferably, at least 2 free roller groups are arranged behind the detection roller group.
Preferably, a gap is reserved between the front free roller group and the rear free roller group respectively.
Further preferably, an active zone is provided in the gap.
Further preferably, the active zone is a steel plate.
Technical scheme two
A detection method of a mining four-wheel drive vehicle brake system is based on the detection equipment of the mining four-wheel drive vehicle brake system, and comprises the following steps:
step 1, detecting the gradient of a road in an actual place applied to a mining four-wheel drive vehicle and the degree of jolt on each gradient, extracting N representative gradient indexes and detection results of representative jolt degree indexes of running vehicles according to the detection results, and storing the N representative gradient indexes and the detection results in a data processor;
step 4, measuring the axle weight;
and 7, detecting the parking brake performance.
The utility model discloses technical scheme two's characteristics lie in with further improvement:
preferably, step 6 comprises the following substeps:
substep 6.1, detecting the maximum braking force of the front axle wheels;
substep 6.1.1, detecting the braking force of the horizontal road surface with gradient i1And the maximum braking force obtained by detection is recorded as F1；
Substep 6.1.2, brake force detection during horizontal road bump is carried out, and the gradient is i1And the maximum braking force obtained by detection is recorded as F1d；
Substep 6.1.3, brake force detection is carried out when simulating an uphill slope, wherein the gradient is i2And the maximum braking force obtained by detection is recorded as F2；
Substep 6.1.4, performing gradient i2The braking force during the simulated uphill pitching is detected, and the maximum braking force obtained by the detection is recorded as F2d；
Substep 6.1.5, respectively carrying out the gradient i according to the method of the substeps 6.1.1 to 6.1.43、i4、…、in、…、iNThe braking force detection of the simulated uphill and the simulated uphill jolt is carried out, and the maximum braking force obtained by detection is respectively recorded as F3、F3d、F4、F4d、…Fn、Fnd、…、FN、FNd；
Substep 6.1.6 of performing gradient j according to the method of steps 6.1-6.4, respectively2、j3、…、jn、…、jNThe braking force detection of the simulated downhill and the simulated downhill bump is carried out, and the maximum braking force obtained by the detection is respectively recorded as D2、D2d、D3、D3d、…Dj、Djd、…、DN、DNd；
A substep 6.1.7 of weighted averaging the maximum braking force obtained at each detection stage, and outputting the final braking force detection result of the front axle, denoted as FFront side：
Wherein f isn、fnd、dj、djdIn order to be the weighting coefficients,
and is
Substep 6.2, detecting the maximum braking force of the rear axle wheel;
the detection method is the same as the substep 6.1, and the final braking force detection result of the rear axle is output and is marked as FRear end。
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a mining four-wheel drive braking system check out test set is to the improvement that current unipolar reaction formula braking force detected the platform, makes its practical application environment that can combine mining four-wheel drive, realizes the accurate detection of mining four-wheel drive braking force.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic top view of an embodiment of a detection device for a mining four-wheel drive vehicle brake system provided by the present invention;
fig. 2 is a schematic side view of an embodiment of the detection device for a mining four-wheel drive vehicle brake system provided by the present invention;
FIG. 3 is a schematic diagram of a mining four-wheel drive vehicle ascending a certain slope under the action of a hydraulic platform;
fig. 4 is the utility model provides a detection project schematic diagram in mining four-wheel drive vehicle braking system detection method.
In the above fig. 1-4: 1, detecting a roller group; 101, detecting a roller before; detecting the roller after 102; 2 free roller sets; 201 front free roller; 202 rear free drum; 3 lifting device; 4, a hydraulic platform; 5, an electric control system; 6 a data processor; 7, a counter-force type roller braking test bed; 8, a reduction gearbox; 9, a motor; 10 active zones; 11 wheels.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a mining four-wheel drive braking system check out test set, including detecting roller set 1, free roller set 2, lifting device 3, hydraulic pressure platform 4, electrical system 5 and data processor 6.
The detection roller group 1 comprises a left detection roller group and a right detection roller group, wherein each detection roller group 1 comprises a front detection roller 101 and a rear detection roller 102; the detection roller set 1 is used for driving a wheel 11 of a detected vehicle to rotate so as to detect the retardation of the wheel 11;
the free roller group 2 is respectively arranged in front of and behind the detection roller group 1 along the advancing direction of the vehicle; the free roller sets 2 have a plurality of groups, and the number of the groups of the free roller sets 2 is set according to different wheel bases of the four-wheel drive mining vehicle. In this embodiment, for convenience of description, the free roller group 2 disposed on the front side is referred to as a front free roller group, and the free roller group disposed on the rear side is referred to as a rear free roller group. Referring to fig. 1, in the present embodiment, the front free roller group and the rear free roller group are provided with 6 groups, respectively. Each free roller group 2 comprises a front free roller 201 and a rear free roller 202 which are respectively marked as a front free roller and a rear free roller;
referring to fig. 1 and 2, there are a plurality of lifting devices 3, and a lifting device 3 is respectively arranged between the front and rear rollers of each detection roller group 1 and each free roller group 2; the lifting device 3 is used for enabling the tested vehicle to stably enter and exit the brake test bed;
referring to fig. 2, the hydraulic platform 4 is plural; a hydraulic platform 4 is arranged below each group of detection roller groups 1 and is used for controlling the up-and-down movement of the detection roller groups 1; and a hydraulic platform 4 is arranged below each free roller group 2 and used for controlling the free roller groups 2 to move up and down and move back and forth so as to realize the purpose of simulating the actual application environment of the mining truck.
In the above embodiment, when the braking force is detected by simulating the actual environment, since the wheel base of the vehicle is a fixed value, the horizontal distance between the detection roller set 1 and the free roller set 2 required for detecting the vehicle is changed to a certain extent when different gradients are simulated. Therefore, gaps are reserved between the front free roller set and the rear free roller set respectively, a movable zone 10 is arranged in each gap, when the movable zone 10 is connected with the free roller sets 2, the movable zone is used for enabling a detected vehicle to stably drive into a brake test bed, when the movable zone 10 is disconnected with the free roller sets 2, the reserved gaps create conditions for the front and rear movement of the free roller sets 2, and the free roller sets 2 cannot be interfered by other free roller sets 2 when moving forwards and backwards.
Specifically, the active zone 10 may be composed of two equally large steel plates, provided at the edge position of each free drum. The steel plate is horizontally placed to play a role in connecting the free rollers, so that a vehicle can stably drive into the test bed, and the free rollers are vertically placed to generate a gap, so that conditions are provided for detecting driving braking force when the vehicle runs up and down a slope.
In the above embodiment, the detection roller set 1 and the lifting device 3 are part of a counter-force type roller braking test bed in the prior art, and the counter-force type roller braking test bed is a braking force detection test bed widely used at present, and is composed of a left and right set of symmetric wheel braking force test units with the same structure and a set of indication and control device. Each set of wheel braking force testing unit comprises a frame, a driving device, a detection roller, a measuring device, a lifting device, an indicating and controlling device and the like.
Referring to fig. 2, the electronic control system 5 is used for driving each hydraulic platform 4 to move and lift, and the data processor is used for storing the detection process, so that the hydraulic platforms 4 can perform predetermined movements at a specified time to simulate the road gradient and the degree of jolt (i.e. uneven road surface), and monitoring and recording the braking force detection data of the reaction type roller braking test bed in real time.
Additionally, the embodiment of the utility model provides a still provide a mining four-wheel drive braking system detection method, based on the mining four-wheel drive braking system check out test set that above embodiment provided, including following step:
step 1, detecting the gradient of a road in an actual place applied to a mining four-wheel drive vehicle and the degree of jolt on each gradient, extracting N representative gradient indexes and detection results of representative jolt degree indexes of running vehicles according to the detection results, and storing the N representative gradient indexes and the detection results in a data processor 5;
the representative gradient index and the representative jolt degree index of the running vehicle are extracted according to the actual environment of the mining four-wheel drive vehicle application.
Each slope is divided intoIs otherwise denoted as i1、i2、…、in、…、iNWherein i1For horizontal disposition of the vehicle, i.e. i1Is equal to 0 and has i1<i2<…<in<…<iN。
And 2, driving the detected vehicle into the test bed in a direction perpendicular to the rollers, so that front axle wheels of the detected vehicle are positioned between the detection rollers, and rear axle wheels of the detected vehicle are positioned between a group of free rollers.
Specifically, a power switch of the test bed is turned on, the lifting device is located at a lifting position, the vehicle to be tested is driven into the test bed in a direction perpendicular to the rollers, the front axle wheel is located on a lifting flat plate between two detection rollers, and the rear axle wheel is located on the lifting flat plate between two free rollers.
And 3, after the detected vehicle is stopped stably, the transmission is placed in a neutral position, and the service brake and the parking brake are respectively in a completely relaxed state. And the pedal switch is sleeved on the brake pedal, and then the lifting device is lowered until the tire of the vehicle to be tested is completely separated from the lifting device.
And 4, measuring the axle weight by using an axle weight measuring device of the test bed.
And 5, starting the motor, and detecting the wheel retarding force after the detection roller drives the wheel to rotate for 2 s.
Referring to fig. 4, the following sub-steps are included:
substep 6.1, detecting the maximum braking force of the front axle wheels;
substep 6.1.1, detecting the braking force of the horizontal road surface with gradient i1And the maximum braking force obtained by detection is recorded as F1；
Substep 6.1.2, carry out horizontal pathDetection of braking force during surface jounce with a gradient i1And the maximum braking force obtained by detection is recorded as F1d；
Substep 6.1.3, brake force detection is carried out when simulating an uphill slope, wherein the gradient is i2And the maximum braking force obtained by detection is recorded as F2；
Substep 6.1.4, performing gradient i2The braking force during the simulated uphill pitching is detected, and the maximum braking force obtained by the detection is recorded as F2d；
Substep 6.1.5, respectively carrying out the gradient i according to the method of the substeps 6.1.1 to 6.1.43、i4、…、in、…、iNThe braking force detection of the simulated uphill and the simulated uphill jolt is carried out, and the maximum braking force obtained by detection is respectively recorded as F3、F3d、F4、F4d、…Fn、Fnd、…、FN、FNd；
Substep 6.1.6 of performing gradient j according to the method of steps 6.1-6.4, respectively2、j3、…、jn、…、jNThe braking force detection of the simulated downhill and the simulated downhill bump is carried out, and the maximum braking force obtained by the detection is respectively recorded as D2、D2d、D3、D3d、…Dj、Djd、…、DN、DNd；
A substep 6.1.7 of weighted averaging the maximum braking force obtained at each detection stage, and outputting the final braking force detection result of the front axle, denoted as FFront side：
Wherein f isn、fnd、dj、djdIn order to be the weighting coefficients,
and is
Substep 6.2, detecting the maximum braking force of the rear axle wheel;
the detection method is the same as the substep 6.1, and the final braking force detection result of the rear axle is output and is marked as FRear end。
Specifically, the present embodiment sets i1、i2、i3And 3 gradients, and respectively detecting the running braking force of the detected vehicle under the 3 gradients. And (3) stepping on the brake pedal for multiple times, measuring the braking force of the left and right wheels of the front axle and the left and right wheels of the rear axle in the whole process of the increase of the braking force and the maximum value of the braking force of each wheel, and respectively recording the sum of the maximum braking force of the left and right wheels of the front axle and the left and right wheels of the rear axle, thus obtaining the maximum braking force of the roller on the wheels of the detection axle. And meanwhile, the brake coordination time is measured. At this stage, the following procedure is specifically followed:
and substep 6.1, detecting the maximum braking force of the front axle wheels.
Substep 6.1.1, detecting the braking force of the horizontal road surface with gradient i1And the maximum braking force obtained by detection is recorded as F1(ii) a At this stage, the free rollers and the detection rollers are at the same height, and the vehicle is horizontally placed.
Substep 6.1.2, brake force detection during horizontal road bump is carried out, and the gradient is i1And the maximum braking force obtained by detection is recorded as F1d。
At this stage, the data processor transmits a pre-stored bumping signal to the electric control system, the electric control system drives the hydraulic platform to drive the rollers corresponding to the tires of the vehicle to bump up and down, the bumping is a continuous dynamic process, namely, the rollers corresponding to the tires perform uneven continuous motion (the bumping degree is extracted in an actual application scene), and the maximum braking force obtained by detection is recorded as F1d. After the detection of the stage is finished, the detection rollers stop working, each roller device returns to the original position, and the vehicle is kept horizontal.
Substep 6.1.3, brake force detection is carried out when simulating an uphill slope, wherein the gradient is i2And the maximum braking force obtained by detection is recorded as F2。
At this stage, the position of the detection roller is not changed, and the free roller is driven by the hydraulic platform to descend to the gradient i2The descent is stopped as shown in fig. 3. Then the detection roller starts to rotate to drive the front wheel to carry out i2And detecting the braking force of the gradient.
Substep 6.1.4, performing gradient i2The braking force during the simulated uphill pitching is detected, and the maximum braking force obtained by the detection is recorded as F2d。
In the stage, the data processor transmits the bumping signals stored in advance to the electric control system, and the electric control system drives the hydraulic platform to drive the rollers corresponding to the tires of the vehicle to bump up and down so as to simulate real road conditions of bumping up slopes.
Substep 6.1.5, proceeding with gradient i according to the method described above3The braking force detection during uphill and uphill jolt is simulated, and the maximum braking force obtained by the detection is recorded as F3、F3d。
And a substep 6.1.6, after the detection of the simulated uphill is finished, each roller returns to the initial position under the drive of the hydraulic platform. And then braking force detection simulating downhill and downhill bump is carried out. At this time, the detection roller is lifted up by the free roller without changing the position thereof, and the slope i is made2、i3Braking force detection simulating downhill and simulating downhill (bump) is performed. The maximum braking forces obtained by detection are respectively recorded as D2、D2d、D3、D3d。
A substep 6.1.7 of weighted averaging the maximum braking force obtained at each detection stage, and outputting the final braking force detection result of the front axle, denoted as FFront side：
Wherein f isn、fnd、dj、djdIn order to be the weighting coefficients,
and is
Substep 6.2, detecting the maximum braking force of the rear axle wheel;
after the maximum braking force of the front axle wheels is detected, the lifting device is lifted, the detected axle is driven out, the next axle is driven in, and the wheel retarding force, the braking force difference of the left wheel and the right wheel and the braking coordination time of the rear axle are detected according to the method. The maximum braking force of the rear axle wheels at each stage is outputted after the maximum braking force and the braking force of the rear axle left and right wheels in the whole process of increasing the braking force under each condition detected for a plurality of times. The detection method is the same as the substep 6.1, and the final braking force detection result of the rear axle is output and is marked as FRear end。
And 7, detecting the parking brake performance.
When the axle related to the parking brake is positioned on the test bed, after the service brake detection is finished, the motor is restarted, and under the condition that the service brake is completely released, the parking brake is tensioned by force, so that the parking brake performance is detected.
And after all the tests are finished, cutting off the power supply of the hole test bed to finish the test.
In the above embodiment, each detection phase lasts for 2 minutes at the time of the braking force detection.
In the above embodiment, the determination of the weighting coefficient is performed by a statistical analysis method, and the dispersion at each evaluation stage is analyzed by using the principle of normal distribution in mathematical statistics to assign weights. The evaluation stage with small dispersion degree has high evaluation reliability relatively, and the given weight is correspondingly large; otherwise, the weights are correspondingly smaller. And the sum of the respective weighting coefficients of the detection axes is 1.
In the above embodiment, when the gradient is changed, the detection roller should stop operating until the gradient is changed, and then continue operating, and the braking force is detected in the next stage.
In the above embodiment, when the slope needs to be changed, the detection roller is not changed, and the position of the free roller changes, in the process of changing the slope, the detection wheel generates pressure difference △ N between the front roller and the rear roller in the detection roller, during the change of the slope, the data processor senses △ N in real time and sends an instruction to the electronic control system to instruct the hydraulic platform to move (the movement includes the up-and-down movement of the hydraulic platform and the movement along the vehicle direction), the hydraulic platform drives the roller to move towards the side of the roller with large pressure along the vehicle direction until the pressure difference △ N is equal to 0, and the hydraulic platform stops moving and is locked after the roller rises to the preset slope.
In the above embodiments, the detection of the parking brake performance and the detection of the brake coordination time are both performed by using a conventional detection method.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The detection equipment for the mining four-wheel drive vehicle brake system is characterized by comprising a detection roller set, a free roller set, a lifting device, a hydraulic platform, an electric control system and a data processor;
the detection roller sets comprise a left detection roller set and a right detection roller set, each detection roller set comprises a front detection roller and a rear detection roller, and the detection roller sets are used for driving wheels of a detected vehicle to rotate so as to detect the retardation of the wheels;
the free roller groups are respectively arranged in front of and behind the detection roller group along the advancing direction of the vehicle; the free roller groups are provided with a plurality of groups, and each free roller group comprises a front free roller and a rear free roller;
the lifting devices are multiple, and one lifting device is respectively arranged between the front roller and the rear roller of each group of detection roller groups and each group of free roller groups; the lifting device is used for enabling the tested vehicle to stably enter and exit the brake test bed;
the number of the hydraulic platforms is multiple; a hydraulic platform is arranged below each group of detection roller groups and is used for controlling the detection roller groups to move up and down; a hydraulic platform is arranged below each free roller group and is used for controlling the free roller groups to move up and down and move back and forth;
the data processor is used for storing the detection process;
and the electric control system is used for driving the hydraulic platforms to move according to the output of the data processor.
2. The mining four-wheel drive vehicle brake system detection device according to claim 1, wherein at least 2 groups of free roller sets are arranged in front of the detection roller set.
3. The mining four-wheel drive vehicle brake system detection device according to claim 1, wherein at least 2 free roller sets are arranged behind the detection roller set.
4. The mining four-wheel drive vehicle brake system detection device according to claim 1, wherein gaps are reserved between the front free roller set and the rear free roller set respectively.
5. The mining four-wheel drive vehicle braking system detection device according to claim 4, characterized in that an active zone is provided in the gap.
6. The mining four-wheel drive vehicle brake system detection device according to claim 5, wherein the active zone is a steel plate.
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