CN115420361A - Vehicle-mounted dynamic calibration method of dynamic truck scale - Google Patents
Vehicle-mounted dynamic calibration method of dynamic truck scale Download PDFInfo
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- CN115420361A CN115420361A CN202210978157.6A CN202210978157A CN115420361A CN 115420361 A CN115420361 A CN 115420361A CN 202210978157 A CN202210978157 A CN 202210978157A CN 115420361 A CN115420361 A CN 115420361A
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- G01G—WEIGHING
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- G01G23/01—Testing or calibrating of weighing apparatus
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Abstract
The invention provides a vehicle-mounted dynamic calibration method of a dynamic truck scale, which comprises the following steps: s10, preparation stage: driving the vehicle-mounted dynamic calibration system to the position of the dynamic truck scale; s20, setting parameters: the parameters comprise a loading force value F, loading pulse time T and interval time T of the dynamic force source loading device, and the parameters are input into the control device; s30, loading test: the control device controls the dynamic force source loading device according to the parameters, so that the pressure-bearing bottom plate applies downward acting force to a weighing platform of the dynamic automobile scale; s40, calibration test: outputting a detection weight M by the dynamic truck scale, correspondingly outputting a reference weight M by the force sensor, and comparing the detection weight M with the reference weight M to obtain a dynamic weighing error of the dynamic truck scale; and S50, completing the calibration of the dynamic automobile scale. The invention has the advantages that: the loading condition of the vehicle passing through the dynamic truck scale is simulated, the control device controls the output of the dynamic force source loading device, and the calibration efficiency of the dynamic truck scale is improved.
Description
Technical Field
The invention relates to the technical field of truck scale calibration, in particular to a vehicle-mounted dynamic calibration method of a dynamic truck scale.
Background
The dynamic truck scale is an automatic weighing machine which is provided with a load carrier and a guide way, can automatically weigh a running vehicle, determine the total mass and/or axle load of the vehicle and can simultaneously determine the axle group load of the vehicle under certain conditions.
The dynamic verification and calibration of the current dynamic automobile scale are carried out according to verification regulations JJG 907 dynamic road vehicle automatic weighing apparatus, reference vehicles of different coaxial types are adopted to carry out 10 tests within a specified speed range, and the tests are carried out according to the following requirements: 6 times by the center of the carrier (weighing platform); 2 passes by the left side close to the carrier (weighing platform); 2 passes by the right side close to the carrier (scale platform). Dynamic tests should be performed at near maximum weighing Max (must not be less than 80% Max), near minimum weighing Min and usual weighing by properly loading or unloading the reference vehicle so that the total reference vehicle mass and axle load (if necessary) cover the weighing range of the dynamic car balance as much as possible.
The detection method has a plurality of problems: (1) The mass of the reference vehicle can not cover the weighing range of the dynamic automobile scale, and even can not reach the minimum weighing and the maximum weighing of the dynamic automobile scale; (2) The calibration efficiency is low, at least 4 shaft types of vehicles are needed for dynamic calibration, each shaft type is tested for 10 times, the workload is large, and the efficiency is low; (3) The safety is poor, the dynamic calibration needs to be tested on an actual road, the highest speed reaches 80km/h, and safety accidents are easy to happen when emergency situations occur; (4) The verification accuracy is low, and because the vehicle is controlled manually, the consistency of the speed, the acceleration and the loading position in the two driving processes cannot be ensured, so that the repeatability and the reproducibility in the calibration process cannot be ensured. (5) The inaccuracy of the calibration process of the dynamic automobile scale is caused by road factors in the driving process of the automobile, vehicle vibration and other interference factors.
Disclosure of Invention
The invention aims to provide a vehicle-mounted dynamic calibration method of a dynamic truck scale, and improve the calibration efficiency of the dynamic truck scale.
The invention is realized in the following way: a vehicle-mounted dynamic calibration method of a dynamic truck scale comprises the following steps:
s10, preparation stage: the vehicle-mounted dynamic calibration system is driven to the position of the dynamic truck scale, the vehicle-mounted dynamic calibration system comprises a transport vehicle, a dynamic force source loading device, a force sensor, a pressure-bearing bottom plate and a control device, the transport vehicle comprises a vehicle head and a carriage, the vehicle head is fixedly connected with the carriage, a through hole is formed in the bottom plate of the carriage, the dynamic force source loading device is fixedly arranged in the carriage, an output shaft of the dynamic force source loading device is in sliding connection with the through hole, the output shaft of the dynamic force source loading device is also fixedly connected with the upper side face of the force sensor, the pressure-bearing bottom plate is fixedly connected with the lower side face of the force sensor, the control device is electrically connected with the dynamic force source loading device, and the pressure-bearing bottom plate is positioned above a weighing platform of the dynamic truck scale;
s20, setting parameters: the parameters comprise a loading force value F, loading pulse time T and interval time T of the dynamic force source loading device, and are input into the control device;
s30, loading test: the control device controls the dynamic force source loading device according to the parameters, so that the pressure bearing bottom plate applies downward acting force to a weighing platform of the dynamic automobile scale;
s40, calibration test: the dynamic truck scale outputs a detection weight M, the force sensor correspondingly outputs a reference weight M, and the detection weight M is compared with the reference weight M to obtain a dynamic weighing error of the dynamic truck scale;
and S50, completing the calibration of the dynamic automobile scale.
Further, the parameters further comprise the wheel base L of two adjacent shafts of the vehicle, the running speed v of the vehicle and the weighing platform width L of the dynamic automobile scale, the loading pulse time T is equal to L/v, and the interval time T is equal to L/v.
Further, the parameters also comprise the axle type N of the vehicle, wherein N is more than or equal to 2, and the wheel base of two adjacent axles of the vehicle is L j J is more than or equal to 1 and less than or equal to N-1,N and j are positive integers, and the interval time is T specifically j ，T j ＝L j /v。
Further, the parameters also include a minimum loading force value F min Max, ofForce value of loading F max And increasing force value F inc Said load force value F being at a minimum load force value F min With the maximum loading force value F max The selection is performed from small to large in sequence.
Further, before the step S10, a step S1 is further included;
s1, calibrating a dynamic force source loading device: the vehicle-mounted dynamic calibration system is firstly driven to a calibration position, then the pressure-bearing bottom plate is tightly attached to the rigid ground, the input current value I of the dynamic force source loading device is adjusted, the dynamic force source loading device outputs a loading force value F, the loading force value F of the dynamic force source loading device is determined by the input current value I, so that the functional relationship F = F (I) between the loading force value F and the input current value I is obtained, and the functional relationship F = F (I) is stored in the control device.
Further, S11 is also included after S10;
s11, preloading test: an output shaft of the dynamic force source loading device moves towards the weighing platform of the dynamic automobile scale for a section of stroke H until a gap between the pressure bearing bottom plate and the weighing platform of the dynamic automobile scale is zero, the control device is initialized, and then the dynamic force source loading device applies a force value F with a proper magnitude to the weighing platform of the dynamic automobile scale 0 The pressure bearing bottom plate is ensured to be tightly pressed and attached with the weighing platform of the dynamic automobile scale, and at the moment, the force sensor outputs the reference weight M 0 The dynamic truck scale outputs a detection weight m 0 And simultaneously resetting the force sensor and the dynamic truck scale.
Further, S41 is also included after S40;
s41, repeatability test: and repeating S30 to S40 for multiple times, recording the test result, and calculating the repeatability error.
Further, S42 is also included after S40;
s42, unbalance loading test: dividing a weighing platform of the dynamic truck scale into a plurality of loading areas, adjusting the position of the vehicle-mounted dynamic calibration system to enable the pressure-bearing bottom plate to be in different loading areas, and turning to S30; when all the load regions are tested, go to S50.
Further, in S10, the vehicle-mounted dynamic calibration system further includes a support leg device, the support leg device is fixedly connected to the carriage, the control device is further electrically connected to the support leg device, and the support leg device is located above the base of the dynamic truck scale.
Furthermore, the support leg device comprises a support bottom plate, a vertical telescopic mechanism and a transverse telescopic mechanism, wherein a machine body of the transverse telescopic mechanism is fixedly arranged on the outer side wall of the carriage, a telescopic rod of the transverse telescopic mechanism is fixedly connected with the machine body of the vertical telescopic mechanism, and a telescopic rod of the vertical telescopic mechanism is fixedly connected with the support bottom plate;
after the transport vechicle reachd the position of developments truck scale, controlling means controls in proper order horizontal telescopic machanism with vertical telescopic machanism makes the supporting baseplate follow the carriage removes the base top of developments truck scale, supporting baseplate supports the base of developments truck scale.
The invention has the advantages that: 1. the loading condition of a vehicle passing through the dynamic truck scale is simulated, the control device controls the output of the dynamic force source loading device, the dynamic truck scale outputs a detection weight in the loading process of the dynamic force source loading device, the force sensor correspondingly outputs a reference weight, and the calibration of the dynamic truck scale is realized through data comparison; the transport vechicle is used for transporting dynamic force source loading device to the developments truck scale of waiting to calibrate, and transport vechicle still plays the supporting role during the calibration, reduces artifical intensity of labour, improves the calibration efficiency to developments truck scale. 2. The loading condition of the dynamic force source loading device is conveniently adjusted by changing the input parameters. 3. The repeatability test can be conveniently and efficiently carried out by setting the parameters of the test times in the control device. 4. The position of the dynamic force source loading device is adjusted by using the transport vehicle according to the loading area of the dynamic automobile balance. .
Drawings
The invention will be further described with reference to the following examples and embodiments with reference to the accompanying drawings.
Fig. 1 is an execution flow chart of the vehicle-mounted dynamic calibration method of the dynamic vehicle scale of the invention.
Fig. 2 is a schematic perspective view of the vehicle-mounted dynamic calibration system according to the present invention.
Fig. 3 is a schematic perspective view of the vehicle-mounted dynamic calibration system of the present invention.
Fig. 4 is a schematic plan front view of the vehicle-mounted dynamic calibration system of the present invention.
Fig. 5 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A in fig. 4.
Figure 6 is a schematic view of the location of the pressure bearing base plate, force sensor, adapter and scale platform of the present invention.
Fig. 7 is a schematic diagram showing the connection between the control device and the computer according to the present invention.
FIG. 8 is a schematic diagram of a prior art reference vehicle passing a dynamic truck scale.
FIG. 9 is a waveform of an output of a two-axis truck loading condition of a prior art dynamic truck scale.
FIG. 10 is a waveform of an output of a multiaxial vehicle loading condition of a prior art dynamic vehicle scale.
FIG. 11 is a schematic view of the loading area of a prior art dynamic truck scale.
Reference numerals: a transport vehicle 1; a vehicle head 11; a vehicle cabin 12; a storage tank 121; a dynamic force source loading device 2; an output shaft 21; an adapter 22; a force sensor 3; a pressure-bearing bottom plate 4; a control device 5; a keyboard 51; a computer 6; a display 61; a support leg device 7; a support base plate 71; a vertical telescoping mechanism 72; a lateral expansion mechanism 73; a dynamic truck scale 8; a base 81; a weighing platform 82; the middle 821; the left side 822; the right side 823; a vehicle 9; front axle wheels 91; rear axle wheels 92.
Detailed Description
The embodiment of the invention provides a vehicle-mounted dynamic calibration method of a dynamic truck scale, overcomes the defect that the dynamic truck scale is calibrated by adopting real vehicles in the prior art, and achieves the technical effect of improving the calibration efficiency of the dynamic truck scale.
In order to solve the above disadvantages, the technical solution in the embodiment of the present invention has the following general idea: simulating the loading condition of a vehicle passing through a dynamic truck scale, and manufacturing a vehicle-mounted dynamic calibration system, wherein the manufactured vehicle-mounted dynamic calibration system comprises a transport vehicle, a dynamic force source loading device, a force sensor, a pressure bearing bottom plate and a control device; the control device controls the output of the dynamic force source loading device, the dynamic truck scale outputs the detection weight in the loading process of the dynamic force source loading device, correspondingly the force sensor outputs the reference weight, the dynamic weighing error of the dynamic truck scale is obtained through data comparison, and the calibration of the dynamic truck scale is realized; the transport vehicle is used for transporting the dynamic force source loading device to the dynamic truck scale to be calibrated, and in the calibration process, the pressure bearing bottom plate is in contact with the weighing platform of the dynamic truck scale, and wheels of the transport vehicle are not in contact with the weighing platform of the dynamic truck scale.
Compared with the description in the background art: (1) The loading force value F of the dynamic force source loading device is determined by the input current value I, and the loading force value is the axle load of the simulated vehicle, namely the acting force applied to a weighing platform when the wheel of the running vehicle is on the weighing platform of the dynamic automobile scale; the control device adjusts the input current value I so as to adjust the loading force value F, thereby effectively covering the weighing range of the dynamic automobile scale. (2) Parameters are input through a keyboard, the loading condition of the dynamic force source loading device is conveniently adjusted, and the loading condition of different types of vehicles in the dynamic truck scale can be simulated. (3) Because the weighing platform of the dynamic automobile scale is not loaded by adopting a real vehicle, the dynamic calibration does not need to be tested on an actual road, and the transport vehicle is stopped at the position of the dynamic automobile scale in the calibration process, so that the safety accidents are greatly reduced. (4) The loading state and the loading position of the dynamic force source loading device are accurately adjusted, parameter deviation caused by manual vehicle control is avoided, and repeatability and reproducibility in a calibration process are guaranteed. (5) The interference factors such as vehicle vibration and the like in the running process of the vehicle on the road surface are avoided, and the accuracy of the dynamic vehicle scale calibration process is improved. (6) The calibration of the dynamic truck scale is realized through data comparison; the weighing platform of the dynamic automobile scale is not required to be loaded by a real vehicle, and the calibration efficiency of the dynamic automobile scale is improved.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.
Referring to fig. 1 to 11, a preferred embodiment of the present invention.
In the prior art, when a real reference vehicle is used to calibrate the dynamic vehicle scale, a schematic diagram is shown in fig. 8, where L is the wheel base of two adjacent axles of the vehicle, where the wheel base of two adjacent axles is the horizontal distance between the central axle of the front wheel and the central axle of the rear wheel of the vehicle in the diagram; l is the platform width of the dynamic truck scale, fig. 9 is the waveform diagram of the output when the two-axle vehicle passes the dynamic truck scale: the first row of waveforms is the waveform output by the front axle wheel of the vehicle on the weighing platform of the dynamic automobile scale, the second row of waveforms is the waveform output by the rear axle wheel of the vehicle on the weighing platform, wherein t 1.1 Time of weighing platform on wheel, t 1.2 The time for which the wheel is completely resting on the weighing platform, t 1.3 For the time of weighing the wheel down, the pulse time t is loaded 1 ＝t 1.1 +t 1.2 +t 1.3 ，t 1.1 And t 1.3 The time of (2) is extremely short; corresponding t 2 ＝t 2.1 +t 2.2 +t 2.3 ，t 1 ＝t 2 And (d) = l/v. The time T is the time interval of the front axle wheel and the rear axle wheel of the vehicle entering the weighing platform, T = L/v, and v is the running speed of the vehicle. The dynamic truck scale processes t through an internal self-contained dynamic processing algorithm 1 The time waveform data is used for obtaining the axle weight m exerted by the front axle wheel 1 Processing t 2 The waveform data of the time of day yields the axle weight m exerted by the rear axle wheels 2 Then, m is put 1 And m 2 Adding the weight m to obtain the total vehicle weight m; normally, the axle weight m exerted by the front axle wheels when the center of gravity of the vehicle is not in the neutral position 1 Axle weight m applied with rear axle wheels 2 Is not the same. And comparing the weights of the front axle, the rear axle and the whole vehicle in the static state of the reference vehicle, namely the dynamic weighing error. Reference herein to the static state of the vehicle is to the state in which the vehicle is stationary resting on the weighing platform of the dynamic truck scale.
Therefore, in order to ensure that the loading mode of the dynamic force source loading device of the invention is consistent with the loading mode of the reference vehicle, the loading output of the dynamic force source loading device of the invention is the loading waveform when the analog reference vehicle calibrates the dynamic automobile balance, as shown in fig. 10, the loading waveform schematic diagram of the multi-axle vehicle (2-axle, 3-axle, 4-axle, 5-axle and 6-axle).
The invention relates to a vehicle-mounted dynamic calibration method of a dynamic truck scale, which comprises the following steps:
s1, calibrating a dynamic force source loading device: firstly, the vehicle-mounted dynamic calibration system is driven to a calibration position, wherein the calibration position can be a flat open rigid ground; the rigid ground is, for example, a concrete ground or a rock ground. And then, tightly attaching the pressure-bearing bottom plate 4 to a rigid ground, adjusting the input current value I of the dynamic force source loading device, outputting a loading force value F by the dynamic force source loading device, and correspondingly outputting a reference weight M by the force sensor 3, wherein the reference weight M is a detection value of the loading force value F. Since the loading force value F of the dynamic force source loading device is determined by the input current value I, a functional relationship F = F (I) between the loading force value F and the input current value I is obtained, and the functional relationship F = F (I) is stored in the control device. For example, when I =10A, F =50kN; that is, when the input current of the dynamic force source loading unit 2 is set to 10A, the output loading force value of the output shaft 21 of the dynamic force source loading unit 2 is 50kN, that is, the reference weight output by the force sensor 3 is also 50kN. Thus, as long as the parameter of the required loading force value is input to the control device 5, the control device 5 automatically adjusts the input current value of the dynamic power loading device 2 according to the functional relationship, so that the dynamic power loading device 2 outputs the required loading force value.
S10, preparation stage: the method comprises the following steps that a vehicle-mounted dynamic calibration system is driven to the position of a dynamic truck scale, and the vehicle-mounted dynamic calibration system comprises a transport vehicle 1, a dynamic force source loading device 2, a force sensor 3, a pressure bearing bottom plate 4 and a control device 5; the transport vehicle 1 comprises a vehicle head 11 and a carriage 12, the vehicle head 11 is fixedly connected with the carriage 12, a through hole is formed in a bottom plate of the carriage 12, the dynamic force source loading device 2 is fixedly arranged in the carriage 12, and an output shaft 21 of the dynamic force source loading device 2 is in sliding connection with the through hole; the output shaft 21 of the dynamic force source loading device 2 is also fixedly connected with the upper side surface of the force sensor 3, the pressure-bearing bottom plate 4 is fixedly connected with the lower side surface of the force sensor 3, the control device 5 is electrically connected with the dynamic force source loading device 2, and the pressure-bearing bottom plate 4 is positioned above the weighing platform 82 of the dynamic truck scale 8.
The vehicle-mounted dynamic calibration system further comprises a support leg device 7, the support leg device 7 is fixedly connected with the carriage 12, the control device 5 is further electrically connected with the support leg device 7, and the support leg device 7 is located above a base 81 of the dynamic truck scale 8. The supporting leg device 7 supports the carriage 12, and improves the balance of the vehicle body of the transport vehicle 1 in the calibration process. The control device 5 adjusts the support state of the support leg device 7.
The support leg device 7 comprises a support bottom plate 71, a vertical telescopic mechanism 72 and a transverse telescopic mechanism 73, wherein a machine body of the transverse telescopic mechanism 73 is fixedly arranged on the outer side wall of the carriage 12, a telescopic rod of the transverse telescopic mechanism 73 is fixedly connected with the machine body of the vertical telescopic mechanism 72, and a telescopic rod of the vertical telescopic mechanism 72 is fixedly connected with the support bottom plate 71; after the transport vehicle 1 reaches the position of the dynamic motor truck scale 8, the control device 5 sequentially controls the horizontal telescopic mechanism 73 and the vertical telescopic mechanism 72, so that the supporting bottom plate 71 moves from the carriage 12 to above the base 81 of the dynamic motor truck scale 8, and the supporting bottom plate 71 abuts against the base 81 of the dynamic motor truck scale 8. The support leg arrangement 7 improves the body balance of the vehicle 1 during calibration.
The transporting vehicle 1 is stopped at the dynamic truck scale 8 and it is confirmed that the wheels of the transporting vehicle 1 are not in contact with the weighing platform 82. For the case that there is a certain travel H between the pressure-bearing base plate 4 and the weighing platform 82, a preload test needs to be performed.
S11, preloading test: the output shaft 21 of the dynamic force source loading device 2 moves a section of travel H towards the weighing platform 82 of the dynamic vehicle scale 8, as shown in fig. 5, until the gap between the pressure-bearing bottom plate 4 and the weighing platform 82 of the dynamic vehicle scale 8 is zero, the control device 5 is initialized, and then the dynamic force source loading device 2 applies a force value F with a proper magnitude to the weighing platform 82 of the dynamic vehicle scale 8 0 To ensure the bearingThe base plate 4 is pressed and attached to the weighing platform 82 of the dynamic motor truck scale 8, and the force sensor 3 outputs a reference weight M at this time 0 The dynamic truck scale 8 outputs the detection weight m 0 And simultaneously resetting the force sensor 3 and the dynamic automobile scale 8. The preloading test is to ensure that the output end of the dynamic force source loading device 2, namely the pressure-bearing bottom plate 4, is in gapless contact with the weighing platform 82 of the dynamic automobile scale 8, and prevent the impact effect generated by idle stroke in the loading process.
S20, setting parameters: the parameters comprise a loading force value F, a loading pulse time T and an interval time T of the dynamic force source loading device 2, and the parameters are input into the control device 5;
the parameters also comprise the wheel base L of two adjacent shafts of the vehicle, the running speed v of the vehicle and the weighing platform width L of the dynamic motor scale 8, the loading pulse time T is equal to L/v, and the interval time T is equal to L/v. The loading pulse time t is the time during which the wheels of the vehicle 9 travel on the weighing platform 82 of the dynamic motor scale 8. The interval time T is a time when the front axle wheels 91 of the vehicle 9 leave the weighing platform 82 of the dynamic vehicle scale 8 and the rear axle wheels 92 of the vehicle 9 do not yet enter the weighing platform 82 of the dynamic vehicle scale 8. According to the condition of the vehicle 9 to be simulated, the wheel base L of two adjacent shafts of the vehicle 9 can be measured; the width of the weighing platform 82 of the dynamic motor scale 8 can be directly measured; according to the calibration requirements, the travel speed v and the loading force value F of the vehicle 9 are set. For a two-axle type vehicle, there is only one wheel base L for two adjacent axles of the vehicle.
The parameters also comprise the axle type N of the vehicle, wherein N is more than or equal to 2, and the wheel base of two adjacent axles of the vehicle is L j J is more than or equal to 1 and less than or equal to N-1,N and j are positive integers, and the interval time is T specifically j ，T j ＝L j And/v. For vehicles of more than three-axle type, there are accordingly wheelbases of two adjacent axles of more than two vehicles. For example, a three-axle type vehicle: n =3, and the wheel base of two adjacent axles of the vehicle is L 1 、L 2 (ii) a Interval time of T 1 And T 2 . Four-axle vehicle: n =4, and the wheel base of two adjacent axles of the vehicle is L 1 、L 2 、L 3 (ii) a Interval time of T 1 、T 2 、T 3 . Thus, the non-physical dynamic calibration system of the dynamic motor scale 8 of the invention can simulate vehicles with various axle types to calibrate the dynamic motor scale 8.
The parameters also include a minimum load force value F min With the maximum loading force value F max Increasing the force value F inc Said load force value F being at a minimum load force value F min With the maximum loading force value F max The selection is carried out from small to large. Minimum load force value F min Is the minimum weighing and the maximum loading force value F of the dynamic automobile scale 8 max Is the maximum weighing of the dynamic truck scale. Therefore, dynamic loading covering the weighing range of the dynamic truck scale is realized.
S30, loading test: the control device 5 controls the dynamic force source loading device 2 according to the parameters, so that the pressure bearing bottom plate 4 applies downward acting force to the weighing platform 82 of the dynamic motor truck scale 8; the wheels of the vehicle 9 are driven into the weighing platform 82 of the dynamic automobile scale 8, and the loading force value is output corresponding to the dynamic force source loading device 2, so that the pressure bearing bottom plate 4 applies downward acting force to the weighing platform 82 of the dynamic automobile scale 8; the wheel of the vehicle 9 leaves the weighing platform 82 of the dynamic automobile balance 8, and the output loading force value is cancelled corresponding to the dynamic force source loading device 2.
S40, calibration test: the dynamic truck scale 8 outputs a detection weight M, correspondingly the force sensor 3 outputs a reference weight M, and the detection weight M is compared with the reference weight M to obtain a dynamic weighing error of the dynamic truck scale 8; the reference weight M output by the force sensor 3 is in accordance with the loading force value F of the set parameter. For the situation of simulating the two-axle vehicle, after the parameters related to the two-axle vehicle are input, the dynamic truck scale 8 outputs the detected weight m corresponding to the front axle wheel 91 through the loading test 1 Detected weight m corresponding to rear axle wheel 92 2 ，m 1 +m 2 Namely the whole weight of the two-axle vehicle. The reference weight M corresponding to the front axle wheel 91 output from the contrast force sensor 3 1 Reference weight M corresponding to rear axle wheel 92 2 Vehicle weight M 1 +M 2 . Namely the dynamic weighing error of the dynamic automobile scale 8 of the two-axle vehicle 9 at a certain speed, and the axle type data and the speed data are changed and then testedAnd obtaining the weighing errors of the dynamic truck scale 8 under different shaft types and different speeds.
S41, repeatability test: and repeating S30 to S40 for multiple times, recording the test result, and calculating the repeatability error. I.e. to simulate a real vehicle 9 driving multiple times over the weighing platform 82 of the dynamic motor scale 8. Because the real vehicle 9 is cancelled to calibrate the dynamic truck scale, the control device 5 is provided with parameters of the test times, and the non-physical dynamic calibration system of the dynamic truck scale 8 is adopted to conveniently and efficiently carry out the repeatability test.
S42, unbalance loading test: dividing the weighing platform 82 of the dynamic truck scale 8 into a plurality of loading areas, adjusting the position of the vehicle-mounted dynamic calibration system to enable the pressure-bearing bottom plate 4 to be in different loading areas, and turning to S30; when all the loading regions are tested, go to S50. As shown in FIG. 10, the scale platform 82 is divided into three load areas, a center 821, a left side 822, and a right side 823. The simulated real vehicle 9 travels from the middle 821, left 822, right 823 of the scale platform 82. The positions of the dynamic force source loading device 2 and the pressure bearing bottom plate 4 are adjusted to the middle 821, the left side 822 and the right side 823 of the weighing platform 82. The positions of the dynamic force source loading device 2 and the pressure-bearing bottom plate 4 are adjusted by driving the transport vehicle 1, and the supporting leg device 7 is firstly folded before driving the transport vehicle 1; after the position is confirmed, the support leg device 7 is placed on the base 81 of the dynamic car scale 8.
And S50, completing the calibration of the dynamic automobile scale 8. The transport vehicle 1 is driven to leave the dynamic truck scale 8, the dynamic force source loading device 2 does not need to be carried manually, the transport vehicle 1 and the dynamic force source loading device 2 are integrated into a whole product, and the calibration efficiency of the dynamic truck scale 8 is greatly improved.
In the present embodiment, the dynamic force source loading device 2 is a linear motor. The loading force value F of the dynamic force source loading device 2 is determined by the input current value I, and the control device 5 changes the loading force value F of the dynamic force source loading device 2 by adjusting the input current value I. The force sensor 3 accurately detects the loading force value by using the existing high-precision force sensor 3.
The vehicle-mounted dynamic calibration system further comprises a computer 6 and a display 61, wherein the computer 6 is provided with a first interface, a second interface and a third interface, the first interface is connected with the display 61, the second interface is connected with the force sensor 3, and the third interface is used for being connected with a dynamic truck scale 8. The computer 6 receives the data of the detected weight output by the dynamic vehicle scale 8 and the data of the reference weight output by the force sensor 3, then visually displays the data on the display 61, and displays the dynamic weighing error of the dynamic vehicle scale 8.
The computer 6, the display 61 and the control device 5 are all located inside the vehicle head 11. The vehicle head 11 is a cab and is also a place for a calibrator to input parameters. When the calibrating person sees the calibration result on the display 61, the calibrating person drives the transport vehicle 1 away from the dynamic motor vehicle scale 8, or drives the transport vehicle 1 to adjust the position of the pressure-bearing floor 4 on the weighing platform 82.
A storage groove 121 is formed in the outer side wall of the carriage 12, the body of the transverse telescopic mechanism 73 is located in the storage groove 121 and is fixedly connected, and the vertical telescopic mechanism 72 and the supporting bottom plate 71 can be accommodated in the storage groove 121. The control device 5 controls the telescopic rod of the transverse telescopic mechanism 73 to extend first, the supporting bottom plate 71 and the vertical telescopic mechanism 72 leave the storage tank 121, then the telescopic rod of the vertical telescopic mechanism 72 extends again, and the supporting bottom plate 71 moves downwards and abuts against the base 81 of the dynamic truck scale 8. When the supporting bottom plate 71 and the vertical telescopic mechanism 72 need to be stored, the control device 5 controls the telescopic rod of the vertical telescopic mechanism 72 to be firstly shortened, so that the supporting bottom plate 71 moves upwards, then the telescopic rod of the transverse telescopic mechanism 73 is shortened, and the supporting bottom plate 71 and the vertical telescopic mechanism 72 enter the storage tank 121.
The transverse telescopic mechanism 73 is an electric push rod, and the control device 5 controls the electric push rod through the existing electric system; the vertical telescopic mechanism 72 is a multi-stage oil cylinder, and the control device 5 controls the multi-stage oil cylinder through an existing hydraulic system.
The support leg devices 7 are four and are respectively positioned at four corners of the carriage 12 of the transport vehicle 1, and the dynamic force source loading device 2 is positioned at the middle position of the carriage 12. The body balance of the transport vehicle 1 during the calibration process is effectively improved.
The vehicle-mounted dynamic calibration system further comprises a joint 22, an output shaft 21 of the dynamic force source loading device 2 is fixedly connected with the joint 22, and the joint 22 is connected with the force sensor 3 through bolt locking. The force sensor 3 and the pressure-bearing bottom plate 4 are also connected through bolt locking. When the force sensor 3 breaks down, it is convenient to replace the force sensor 3.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. A vehicle-mounted dynamic calibration method of a dynamic truck scale is characterized by comprising the following steps:
s10, preparation stage: the vehicle-mounted dynamic calibration system is driven to the position of the dynamic truck scale, the vehicle-mounted dynamic calibration system comprises a transport vehicle, a dynamic force source loading device, a force sensor, a pressure-bearing bottom plate and a control device, the transport vehicle comprises a vehicle head and a carriage, the vehicle head is fixedly connected with the carriage, a through hole is formed in the bottom plate of the carriage, the dynamic force source loading device is fixedly arranged in the carriage, an output shaft of the dynamic force source loading device is in sliding connection with the through hole, the output shaft of the dynamic force source loading device is also fixedly connected with the upper side face of the force sensor, the pressure-bearing bottom plate is fixedly connected with the lower side face of the force sensor, the control device is electrically connected with the dynamic force source loading device, and the pressure-bearing bottom plate is positioned above a weighing platform of the dynamic truck scale;
s20, setting parameters: the parameters comprise a loading force value F, loading pulse time T and interval time T of the dynamic force source loading device, and are input into the control device;
s30, loading test: the control device controls the dynamic force source loading device according to the parameters, so that the pressure bearing bottom plate applies downward acting force to a weighing platform of the dynamic automobile scale;
s40, calibration test: the dynamic truck scale outputs a detection weight M, the force sensor correspondingly outputs a reference weight M, and the detection weight M is compared with the reference weight M to obtain a dynamic weighing error of the dynamic truck scale;
and S50, completing the calibration of the dynamic truck scale.
2. The method according to claim 1, wherein the parameters further include an axle distance L between two adjacent axles of the vehicle, a driving speed v of the vehicle, and a platform width L of the dynamic vehicle scale, the pulse loading time T is equal to L/v, and the interval time T is equal to L/v.
3. The vehicle-mounted dynamic calibration method of the dynamic vehicle scale according to claim 2, wherein the parameters further include a vehicle axle type N, N is more than or equal to 2, and an axle distance between two adjacent axles of the vehicle is L j J is more than or equal to 1 and less than or equal to N-1,N and j are positive integers, and the interval time is T j ，T j ＝L j /v。
4. The method of claim 1, wherein the parameters further include a minimum load force value F min Maximum load force value F max And increasing force value F inc Said load force value F being at a minimum load force value F min With the maximum loading force value F max The selection is performed from small to large in sequence.
5. The vehicle-mounted dynamic calibration method for the dynamic vehicle scale of claim 1, wherein before the step S10, the method further comprises the step S1;
s1, calibrating a dynamic force source loading device: the vehicle-mounted dynamic calibration system is firstly driven to a calibration position, then the pressure-bearing bottom plate is tightly attached to the rigid ground, the input current value I of the dynamic force source loading device is adjusted, the dynamic force source loading device outputs a loading force value F, the loading force value F of the dynamic force source loading device is determined by the input current value I, so that the functional relation F = F (I) between the loading force value F and the input current value I is obtained, and the functional relation F = F (I) is stored in the control device.
6. The vehicle-mounted dynamic calibration method for the dynamic vehicle scale of claim 1, further comprising S11 after the step S10;
s11, preloading test: an output shaft of the dynamic force source loading device moves towards the weighing platform of the dynamic automobile scale for a section of stroke H until a gap between the pressure bearing bottom plate and the weighing platform of the dynamic automobile scale is zero, the control device is initialized, and then the dynamic force source loading device applies a force value F with a proper magnitude to the weighing platform of the dynamic automobile scale 0 The pressure bearing bottom plate is ensured to be tightly pressed and attached with the weighing platform of the dynamic automobile scale, and at the moment, the force sensor outputs the reference weight M 0 The dynamic truck scale outputs a detection weight m 0 And simultaneously resetting the force sensor and the dynamic truck scale.
7. The vehicle-mounted dynamic calibration method for the dynamic vehicle scale of claim 1, further comprising, after the step S40, a step S41;
s41, repeatability test: and repeating S30 to S40 for multiple times, recording the test result, and calculating the repeatability error.
8. The vehicle-mounted dynamic calibration method for the dynamic vehicle scale of claim 1, further comprising, after the step S40, a step S42;
s42, unbalance loading test: dividing a weighing platform of the dynamic truck scale into a plurality of loading areas, adjusting the position of the vehicle-mounted dynamic calibration system to enable the pressure-bearing bottom plate to be in different loading areas, and turning to S30; when all the load regions are tested, go to S50.
9. The method according to claim 1, wherein in S10, the vehicle-mounted dynamic calibration system further includes a support leg device, the support leg device is fixedly connected to the carriage, the control device is further electrically connected to the support leg device, and the support leg device is located above a base of the dynamic vehicle scale.
10. The vehicle-mounted dynamic calibration method of the dynamic truck scale according to claim 9, wherein the support leg device comprises a support bottom plate, a vertical telescopic mechanism and a horizontal telescopic mechanism, a body of the horizontal telescopic mechanism is fixedly arranged on the outer side wall of the carriage, a telescopic rod of the horizontal telescopic mechanism is fixedly connected with the body of the vertical telescopic mechanism, and a telescopic rod of the vertical telescopic mechanism is fixedly connected with the support bottom plate;
after the transport vechicle reachd the position of developments truck scale, controlling means controls in proper order horizontal telescopic machanism with vertical telescopic machanism makes the supporting baseplate follow the carriage removes the base top of developments truck scale, supporting baseplate supports the base of developments truck scale.
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