CN112013942A - Dynamic calibration platform for vehicle load - Google Patents

Abstract

The invention relates to a dynamic calibration platform for vehicle loads, which is characterized in that: the calibration platform includes a left guide rail bracket and a right guide rail bracket, the left guide rail bracket and the right guide rail bracket are connected by a connecting beam, and a tie rod is arranged on the connecting beam, and the tie rod Connecting the cross beam and the frame of the vehicle; respectively setting a force measuring box mechanism corresponding to the number of wheels of the vehicle on the left rail bracket and the right rail bracket; the force measuring box mechanism includes a force measuring box, a jacking device and a measuring device. The force sensor, the force measuring box includes a box body and a cover plate, the cover plate is used to support the tires of the vehicle, the jacking device is located under the force measuring box, and the power output end of the jacking device outputs periodic pulsating force applied to the cover plate and its The load cell is arranged in the box to detect the jacking force of the jacking device. The invention adopts periodic pulsating force for calibration, can obtain a complete and accurate relationship curve between vehicle load and spring deformation, and improves accuracy.

Description

Dynamic Calibration Platform for Vehicle Loads

technical field

The invention relates to a dynamic calibration platform for vehicle loads, which belongs to a calibration and calibration device for vehicle loads.

Background technique

At present, various stress, strain, displacement, and angle sensors are mostly used in the field of automobile weighing at home and abroad to measure related parameters.

In recent years, with the advancement of sensor technology, the measurement accuracy of many sensors has been improved, which can reflect the changes in parameters caused by the load. Measure the spring force deformation of each wheel of the vehicle, and obtain the load of the vehicle through calculation, which requires firstly to determine the relationship between the vehicle load and the spring deformation. The traditional way of measuring the relationship between load force and deformation is always slow application of force, and the measurement of applied load force and spring deformation is static. When the relationship between load and deformation obtained by this calibration method is used to measure the vehicle load, the curves of load force and deformation force do not overlap at all when loading and unloading alone, as shown in Figure 1, and can only be used as a reference. Sometimes The error is more than 15%. This is because when loading and unloading slowly, there is static friction between the spring and the frame, and the coefficient of static friction is not a fixed value. The friction exists objectively and cannot be avoided.

Using the periodic pulsating force can obtain a complete and accurate relationship curve between vehicle load and spring deformation, and solve the influence of static friction in the calibration process of the relationship between vehicle load and spring deformation. The deformation sensor calculates the load data of the vehicle based on the deformation of the sensor. Due to the difference in the self-weight of the vehicle, the load-bearing method, the installation process, and the quality of the equipment, the load data reflected by the equipment installed on different vehicles is different. Carry out the setting and calibration of the basic parameters of the load-carrying equipment in the case of each vehicle. At present, manual calibration is mostly used, that is, comprehensive analysis is carried out according to the value of the load data when the vehicle is unloaded, half-loaded, and fully loaded. This method cannot guarantee the accuracy of parameter settings.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a dynamic calibration platform for vehicle load, which adopts periodic pulsating force for calibration, and can obtain a complete and accurate relationship curve between vehicle load and spring deformation, and improves the accuracy.

According to the technical solution provided by the present invention, the dynamic calibration platform for vehicle load is characterized in that: the calibration platform includes a left rail bracket and a right rail bracket for supporting the left and right tires of the vehicle, respectively, a left rail bracket and a right rail bracket. They are connected by a connecting beam, and a tie rod is arranged on the connecting beam, and the tie rod connects the connecting beam and the main beam of the vehicle; the left guide rail bracket and the right guide rail bracket are respectively provided with a force measuring box mechanism corresponding to the number of wheels of the vehicle; the said The force measuring box mechanism includes a force measuring box, a jacking device and a force measuring sensor, the force measuring box includes a box body and a cover plate, the cover plate is used to support the vehicle tires, the jacking device is located under the force measuring box, and the The power output end outputs periodic pulsating force applied to the cover plate and the vehicle on it; the load cell is arranged in the box body and is used for detecting the jacking force of the jacking device.

Further, the lower end of the tie rod is fixedly connected with the connecting beam, and the upper end of the tie rod is connected with the frame of the vehicle through a hook.

Further, a distance adjusting member is arranged on the pull rod to adjust the length of the pull rod.

Further, the front and rear ends of the left rail bracket and the right rail bracket are connected by connecting beams.

Further, three force measuring cell mechanisms are respectively arranged on the left rail bracket and the right rail bracket.

Further, the jacking device includes a bracket, a cam, an upper force block and a jacking drive mechanism, and the upper force block, the cam and the jacking drive mechanism are installed in the bracket, and the jacking drive mechanism and the upper force block are movable up and down. Installed in the bracket, the jacking drive mechanism is connected with the upper force block through the piston, and a cam is arranged below the jacking drive mechanism through the rotation of the camshaft, and the camshaft is connected with the driving device to drive the cam to rotate periodically.

Further, the jacking drive mechanism adopts a jack or an oil cylinder.

Further, the applied force of the jacking device is controlled by PLC or relay.

Further, the driving device adopts a motor.

The present invention has the following advantages:

On the one hand, the calibration platform adopted in the present invention is suitable for the dynamic calibration of the relationship between the load and the spring deformation of various vehicles, and can adjust the corresponding force-measuring box mechanism according to different vehicles to complete the calibration process; on the other hand, the present invention avoids the traditional measurement force and deformation All of them are static defects. By using dynamic and periodic changes around a certain load value, the measured deformation is also dynamically changed around a certain deformation value, so that the measured vehicle load-deformation relationship standard curve can exclude springs. The effect of friction, the precision is more accurate.

Description of drawings

FIG. 1 is a schematic diagram of a curve when loading and unloading individually in the prior art.

FIG. 2 is a working state diagram of the dynamic calibration platform for vehicle loads according to the present invention.

FIG. 3 is a top view of the dynamic calibration platform for the vehicle load.

FIG. 4 is a cross-sectional view of the dynamic calibration platform for the vehicle load.

FIG. 5 is a top view of the force cell.

FIG. 6 is a cross-sectional view of the force measurement.

FIG. 7 is a structural view of the vehicle on the guide rail bracket.

FIG. 8 is a schematic structural diagram of the jacking device.

Description of reference numerals: 1-left rail bracket, 2-right rail bracket, 3-contact beam, 4-force measuring box mechanism, 41-force measuring box, 411-box body, 412-cover plate, 42-jacking device , 421-bracket, 422-cam, 423-upload force block, 424-jacking drive mechanism, 425-piston, 426-camshaft, 43-load sensor, 5-tie rod, 6-hook, 7-beam, 8 -Distance adjuster, 9-leaf spring.

Detailed ways

The present invention will be further described below in conjunction with the specific drawings.

As shown in Figures 2-7, it is a schematic structural diagram of a dynamic calibration platform for vehicle loads according to the present invention. The calibration platform includes a left rail bracket 1 and a right rail bracket 2, and the front and rear of the left rail bracket 1 and the right rail bracket 2 The ends are connected by the connecting beam 3. The left rail bracket 1 and the right rail bracket 2 are used for vehicle support. The vehicle travels to the left rail bracket 1 and the right rail bracket 2. The tires on the left and right sides of the vehicle are respectively supported by the left rail bracket 1 and the right rail bracket 2. on the right rail bracket 2. The left rail bracket 1 and the right rail bracket 2 are respectively provided with load cell mechanisms 4 corresponding to the number of wheels of the vehicle. In this embodiment, three force cell mechanisms 4 are respectively arranged on the left rail bracket 1 and the right rail bracket 2 Force cell mechanism 4, suitable for three-axle six-wheel vehicles.

As shown in FIGS. 4-6 , the force measuring box mechanism 4 includes a force measuring box 41, a jacking device 42 and a force measuring sensor 43; the force measuring box 41 includes a box body 411 and a cover plate 412, and the cover plate 412 For supporting the vehicle tires, the jacking device 42 is located below the force measuring box 41, and the jacking device 42 is used for jacking up the force measuring box 41 and the vehicle supported on the force measuring box 41; the force measuring sensor 43 is arranged on the force measuring box 41. The box body 411 of the box 41 is used to detect the jacking force of the jacking device 42 .

As shown in FIG. 7 , the connecting beam 3 is provided with a pull rod 5 , the lower end of the pull rod 5 is fixedly connected with the connecting beam 3 , and the upper end of the pull rod 5 is connected with the frame 7 of the vehicle through the hook 6 . For different vehicle models, the distance between the frame 7 of the vehicle and the connecting beam 3 is different, so a distance adjusting member 8 is provided on the draw rod 5 to adjust the length of the draw rod 5 to ensure that the length of the draw rod 5 is the same as the length of the frame 7 of the vehicle. Consistent with the height between the connecting beams 3.

The applied force of the jacking device 42 is controlled by PLC or relay, and the jacking device 42 provides a pulsating force, that is, the applied force is applied to the cover plate of the force measuring box in a periodic pulsating manner to ensure the balance between force and deformation. is a dynamic relationship. As shown in FIG. 8 , it is a schematic structural diagram of the jacking device 42 capable of providing periodic pulsating force. The jacking device 42 includes a bracket 421 , a cam 422 , an upper force block 423 and a jacking drive mechanism 424 , and the upper force block 423 , the cam 422 and the jacking drive mechanism 424 are installed in the bracket 421 , and the jacking drive mechanism 424 The upper force block 423 and the upper force block 423 are movably installed up and down in the bracket 421, the jacking drive mechanism 424 is connected with the upper force block 423 through the piston 425, and the cam shaft 426 is rotated below the jacking drive mechanism 424 to set the cam 422, and the cam shaft 426 is connected to the motor connected to drive the cam 422 to rotate periodically; the jacking drive mechanism 424 drives the piston 425 to exert a force on the upper force block 423, and while the upper force block 423 acts upward, the cam 422 rotates to make the jacking drive mechanism 424 cycle Reciprocating linear displacement up and down. The working principle of the jacking device 42 is as follows: the jacking drive mechanism 424 exerts a force on the upper force block 423 through the piston 425, and during the rotation of the cam 422, the jacking drive mechanism 424 and the upper force 423 perform a reciprocating linear displacement up and down, so that the A pulsating cycle force is created by applying a force to the dynamometer cover plate and thus to the vehicle. The jacking drive mechanism 424 adopts a jack or an oil cylinder or the like.

The working principle of the vehicle load dynamic calibration platform of the present invention: a vehicle with three axles and six wheels is parked on the load cell cover plates 412 of the six load cell mechanisms 4 on the left guide rail bracket 1 and the right guide rail support 2, and the girder of the vehicle 7 is connected with the upper end of the pull rod 5 through the hook 6, and the lower end of the pull rod 5 is connected with the beam 3. The jacking device 42 starts to work, jacking up the vehicle, so that the leaf spring 9 at the tire is deformed, and the deformation of the leaf spring 9 is detected by the deformation sensor at the tire; The magnitude of the force on the leaf spring 9, so as to obtain the relationship curve between the force and the deformation of the leaf spring.

The dynamic calibration platform of the vehicle load of the present invention adopts a dynamic applied force that changes periodically around a certain load value, and the measurement and deformation are also dynamic and change periodically around a certain deformation value, so that the measurement remains dynamic. The kinetic friction coefficient is relatively stable, so the friction coefficient during loading and unloading is always stable, so the measured vehicle load-deformation standard curve, whether it is used for loading or unloading, is coincident.

Claims (9)

1. A dynamic calibration platform for vehicle load is characterized in that: the calibration platform comprises a left guide rail support (1) and a right guide rail support (2) which are used for respectively supporting left and right tires of a vehicle, the left guide rail support (1) and the right guide rail support (2) are connected through a connection cross beam (3), a pull rod (5) is arranged on the connection cross beam (3), and the pull rod (5) is connected with the connection cross beam (3) and a crossbeam (7) of the vehicle; force measuring box mechanisms (4) corresponding to the number of wheels of a vehicle are respectively arranged on the left guide rail bracket (1) and the right guide rail bracket (2); the force measuring box mechanism (4) comprises a force measuring box (41), a jacking device (42) and a force measuring sensor (43), wherein the force measuring box (41) comprises a box body (411) and a cover plate (412), the cover plate (412) is used for supporting a vehicle tire, the jacking device (42) is positioned below the force measuring box (41), and a power output end of the jacking device (42) outputs periodic pulsating force to be applied to the cover plate (412) and a vehicle thereon; the load cell (43) is arranged in the box body (411) and used for detecting the jacking force of the jacking device (42).

2. A dynamic calibration platform for vehicle loads according to claim 1, wherein: the lower end of the pull rod (5) is fixedly connected with the connection cross beam (3), and the upper end of the pull rod (5) is connected with a girder (7) of a vehicle through a hook (6).

3. A dynamic calibration platform for vehicle loads according to claim 2, wherein: a distance adjusting piece (8) is arranged on the pull rod (5) to adjust the length of the pull rod (5).

4. A dynamic calibration platform for vehicle loads according to claim 1, wherein: the front end and the rear end of the left guide rail bracket (1) and the front end and the rear end of the right guide rail bracket (2) are connected by a connection cross beam (3).

5. A dynamic calibration platform for vehicle loads according to claim 1, wherein: and three force measuring box mechanisms (4) are respectively arranged on the left guide rail bracket (1) and the right guide rail bracket (2).

6. A dynamic calibration platform for vehicle loads according to claim 1, wherein: jacking device (42) are including support (421), cam (422), upload power piece (423) and jacking actuating mechanism (424) install in support (421) and pass power piece (423), cam (422) and jacking actuating mechanism (424), jacking actuating mechanism (424) and upload power piece (423) are movable from top to bottom and are installed in support (421), jacking actuating mechanism (424) are connected with uploading power piece (423) through piston (425), the below of jacking actuating mechanism (424) is rotated through camshaft axle (426) and is set up cam (422), camshaft (426) are connected with drive arrangement to drive cam (422) periodic rotation.

7. The dynamic calibration platform for vehicle loads according to claim 6, wherein: the jacking driving mechanism (424) adopts a jack or an oil cylinder.

8. A dynamic calibration platform for vehicle loads according to claim 1, wherein: the force applied by the jacking device (42) is controlled by a PLC or a relay.

9. The dynamic calibration platform for vehicle loads according to claim 6, wherein: the driving device adopts a motor.

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