Vehicle-mounted weighing system and dumper

Abstract

The vehicle-mounted weighing system comprises a vehicle body, a balance shaft, a plate spring, a connecting mechanism, a sliding plate seat and a mechanical sensor, the connecting mechanism comprises a plate spring cover plate and a u-bolt, the mechanical sensor is arranged on the u-bolt, and when goods are loaded in the vehicle body of the dumper, the plate spring cover plate is connected with the sliding plate seat through the mechanical sensor. The u-bolt deforms under the action of the load, the mechanical sensor detects the strain value when the u-bolt deforms, and the weight of goods loaded on the vehicle body is obtained according to the strain value. The weighing precision is high, and the weighing system is simple in structure.

Description

Technical Field

[0001] The invention relates to the technical field of equipment manufacturing, and in particular to a vehicle-mounted weighing system and a dump truck. Background Art

[0002] The vehicle-mounted weighing system is a fully automatic weighing instrument used to obtain the mass of the cargo loaded on the vehicle. Existing vehicle-mounted weighing systems generally include weighing systems in the form of truck scales, suspension displacement sensors, etc. However, the existing weighing systems are often complex in structure, and when the above-mentioned weighing systems work under complex working conditions, measurement deviations often occur. For example, for the suspension displacement sensor, it directly measures the deformation of the suspension system, and indirectly calculates the vehicle's loading mass through the suspension deformation and the inherent stiffness properties of the suspension. This measurement method is more suitable for road conditions with smooth roads. If the road surface is uneven, the measurement accuracy is prone to deviations. It is impossible to accurately obtain the actual weight of the cargo carried in the vehicle body. Therefore, the detection accuracy of the existing weighing system is not ideal and needs to be further improved. Summary of the invention

[0003] The purpose of this application is to overcome the above technical deficiencies and propose a vehicle-mounted weighing system and a dump truck to solve the technical problem in the prior art that the weighing effect is not ideal when weighing the goods in the vehicle body.

[0004] In order to achieve the above technical objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a vehicle-mounted weighing system, comprising: Vehicle body; A balance shaft, which is located at the bottom of the vehicle body; a leaf spring, fixed on the balance shaft; A connecting mechanism, comprising a leaf spring cover plate and a plurality of riding bolts and nuts, wherein the leaf spring cover plate is clamped on the top of the leaf spring, one end of the riding bolt is connected to the leaf spring cover plate and fixed by the nut, and the other end of the riding bolt is arranged on one side of the balance shaft; A slide plate seat, the slide plate seat is arranged on both sides of the leaf spring; Among them, the vehicle-mounted weighing system also includes a mechanical sensor, which is arranged on the riding bolt. The riding bolt deforms under the action of load. The mechanical sensor detects the strain value of the riding bolt during deformation and obtains the vehicle body load based on the strain value.

[0005] In some embodiments, the leaf spring is provided in plurality, the plurality of leaf springs are stacked in sequence in the vertical direction, and the length of the leaf spring close to the balancing shaft is greater than the length of the leaf spring away from the balancing shaft.

[0006] In some embodiments, the vehicle-mounted weighing system further includes a center locating pin, and the leaf spring is further provided with a vertical hole at a middle position of the balance shaft, and the center locating pin is inserted into the vertical hole.

[0007] In some embodiments, the vehicle body also includes a front axle, a mid-axle and a rear axle arranged at different positions, the balance shaft is arranged on the mid-axle and the rear axle, and the leaf springs are arranged in two groups, each group of leaf springs is reversely installed on the balance shaft.

[0008] In some embodiments, two rows of the riding bolts and the nuts are correspondingly arranged on both sides of the leaf spring cover plate, the nuts are arranged at the ends of the riding bolts and cooperate with the riding bolts, and the number of the riding bolts in each row is set to an even number.

[0009] In some embodiments, a plurality of the leaf springs are stacked along a first direction, and the saddle bolts are tilted relative to the first direction.

[0010] In some embodiments, the riding bolt has a first angle with the first direction; Wherein, the first angle is set to be an acute angle.

[0011] In some embodiments, the riding bolts located on the same side of the leaf spring cover are symmetrically arranged relative to the first direction, and the riding bolts on both sides of the leaf spring cover are symmetrically arranged relative to the axis of the leaf spring cover.

[0012] In some embodiments, the connecting mechanism further includes a slide plate seat, and the slide plate seat is arranged at corresponding positions at both ends of the leaf spring.

[0013] In a second aspect, the present application also provides a dump truck, which includes the on-board weighing system provided in the embodiments of the present application.

[0014] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: In the embodiment of the present application, a vehicle-mounted weighing system and a dump truck are provided. The vehicle-mounted weighing system includes a vehicle body, a balance shaft, a leaf spring, a connecting mechanism, a slide plate seat and a mechanical sensor, wherein the connecting mechanism includes a leaf spring cover plate and a riding bolt, and the mechanical sensor is arranged on the riding bolt. When the cargo in the body of the dump truck is weighed, the riding bolt is deformed under the action of the load, and the mechanical sensor detects the strain value when the riding bolt is deformed, and obtains the weight of the cargo carried by the vehicle body according to the strain value. The weighing accuracy is high, and the weighing system structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution in this application, the following is a brief introduction to the drawings required for use in the embodiments: Figure 1 This is a schematic diagram of the structure of a mining dump truck provided in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the vehicle-mounted weighing system provided in an embodiment of the present application.

[0016] Reference numerals: Vehicle body 101, vehicle frame 102, vehicle front axle 103, vehicle middle axle 104, vehicle rear axle 105, vehicle-mounted weighing system 106, and wheels 107; Connecting mechanism 20 , leaf spring cover 201 , riding bolt 202 , leaf spring 203 , slide plate seat 204 , balancing shaft 205 , positioning part 206 , arch bridge 207 , support beam 208 , nut 209 , mechanical sensor 210 , reinforcing rib 211 , connecting platform 212 . DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] Those skilled in the art will appreciate that in this specification, the wording "including" is an open-ended expression, which means that the described features exist but does not exclude other features. The directional words "up", "down", "left", "right", etc. are exemplary directions based on the drawings. Features defined as "first" and "second" implicitly include one or more of the features. Singular expressions can also be used in the plural. "Multiple" means two or more. The terms "installed", "connected", and "connected" can be fixed connections, detachable connections, or integrated connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. In addition, "connected" can include wireless connections.

[0019] At present, for mining dump trucks, especially wide-body mining dump trucks, since the road surface on which the vehicle body travels is uneven and has large ups and downs, most vehicles need to be designed with buffer shock absorbers, which serve to reduce the impact load. At the same time, in the prior art, it is also necessary to set up a corresponding on-board weighing system in the mining dump truck, such as a vehicle scale structure, a suspension displacement sensor structure, a leaf spring strain and other structures. However, since the operating conditions of mining dump trucks are relatively complex, the above-mentioned on-board weighing system is prone to measurement deviations under complex conditions, which leads to the problem of unsatisfactory measurement accuracy.

[0020] The embodiment of the present application provides a mining dump truck and a vehicle-mounted weighing system in the mining dump truck. By improving the existing vehicle-mounted weighing system, the use effect of the mining dump truck in complex working conditions is effectively improved, and its measurement accuracy is improved.

[0021] like Figure 1 As shown, Figure 1 The structure diagram of a mining dump truck provided in the embodiment of the present application is shown in FIG. 1 , wherein the mining dump truck comprises a vehicle body 101 , a vehicle frame 102 , a front axle 103 , a middle axle 104 , a rear axle 105 , a vehicle-mounted weighing system 106 , and wheels 107 .

[0022] Specifically, the vehicle body 101 can be set according to the size and shape of different vehicle bodies. Optionally, the vehicle body 101 is set to a rectangular box, a square box or other shapes and specifications. The vehicle body 101 can be fixedly or detachably installed on the frame 102. The vehicle body 101 is fixed by the frame 102 to prevent the vehicle body 101 from sliding or shaking during the transportation of goods, so as to improve the stability of the mine car.

[0023] In the embodiment of the present application, the dump truck is mainly a mining dump truck, and therefore, the vehicle body 101 is usually set to a rectangular structure, such as a wide-body mining dump truck. When setting the structure of the dump truck, a reliable leaf spring rear suspension structure is adopted. By setting the leaf spring rear suspension structure as the vehicle-mounted weighing system in the embodiment of the present application, the installation cost is effectively reduced and its weighing accuracy and performance are improved.

[0024] For further details, see Figure 1 In the figure, the frame 102 is used to support the vehicle body 101. At the same time, on one side of the frame 102, such as the bottom of the frame 102, a plurality of supporting bridge parts are correspondingly arranged. Specifically, for a mining dump truck, the supporting bridge parts include a front bridge 103, a middle bridge 104 and a rear bridge 105. Different bridge parts are arranged at different positions of the vehicle body 101. For example, the front bridge 103 is correspondingly arranged at the front part of the vehicle, the middle bridge 104 is arranged in the middle part of the vehicle body, or at the rear part of the middle part, and the rear bridge 105 is arranged at the rear part of the vehicle body. In this way, different axles are arranged at different parts to improve the support and load-bearing effects.

[0025] In the embodiment of the present application, the front axle 103, the middle axle 104 and the rear axle 105 can be arranged with reference to conventional axle structures, which will not be described in detail here.

[0026] In the embodiment of the present application, the vehicle weighing system 106 is correspondingly arranged on the vehicle middle bridge 104 and the vehicle rear bridge 105, so as to detect the weight carried by the vehicle body through the vehicle weighing system. The size of the vehicle weighing system 106 can be set according to the structure of different vehicle bodies and the specifications of the axles.

[0027] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the vehicle weighing system provided in the embodiment of the present application, combined with Figure 1 In the vehicle body structure, in the embodiment of the present application, the vehicle-mounted weighing system includes: a connecting mechanism 20, a leaf spring 203, a skateboard seat 204, a balancing shaft 205, a positioning portion 206, an arch bridge 207, a support beam 208, a nut 209, and a mechanical sensor 210.

[0028] Specifically, when the above structure is set, the connecting mechanism 20 further includes a leaf spring cover plate 201 and a riding bolt 202. The leaf spring cover plate 201 is set on the leaf spring 203, such as the leaf spring cover plate 201 is set on the top of the leaf spring 203 near the vehicle body 101. The leaf spring cover plate 201 can be set as a square cover plate, and the lower surface of the leaf spring cover plate 201 is tightly abutted against the upper surface of the leaf spring 203, thereby ensuring the installation effect.

[0029] In the embodiment of the present application, when the leaf spring 203 is provided, the leaf spring 203 is provided in two groups, the two groups of leaf springs are provided on both sides of the vehicle body, and each group of leaf springs is reversely installed on the balance shaft. The leaf spring 203 may include multiple leaf springs 203, and multiple leaf springs 203 are provided in a stacked manner. Figure 2 As shown in the leaf spring stacking structure diagram, multiple leaf springs 203 are stacked in sequence, and the length of the leaf springs 203 can gradually increase from the bottom to the top of the vehicle-mounted weighing system, that is, the length of the leaf spring 203 at the bottom is the largest, and the length of the leaf spring 203 at the top is the smallest. The widths of the multiple leaf springs 203 can be set to the same width to ensure consistency during stacking.

[0030] Further, the materials of the leaf springs 203 can be set to be the same material, or different materials can be selected according to the use conditions, such as the bottom leaf spring 203 uses a first material, and the top leaf spring 203 uses another second material, the first material and the second material are different materials, and the stiffness of the first material can be greater than or equal to the stiffness of the second material, so that the support effect and reliability of the bottom leaf spring 203 can be further improved. The above different materials can be selected according to the use requirements, and will not be repeated here.

[0031] In the embodiment of the present application, when a plurality of different leaf springs 203 are combined into the leaf spring system of the present application, a vertical hole can be provided, such as a vertical hole is provided at the middle position of the leaf spring 203, and when each leaf spring is installed in position, the vertical holes of different leaf springs 203 are aligned, and after alignment, a center positioning pin is provided in the vertical hole, so that the center positioning pin can limit the movement of the leaf spring 203, thereby achieving the purpose of fixing and combining the leaf spring 203. In the embodiment of the present application, the vertical hole is provided inside the leaf spring, and the schematic diagram does not specifically illustrate the vertical hole structure.

[0032] Furthermore, in the embodiment of the present application, multiple vertical holes can be provided at corresponding positions of each leaf spring 203 according to the specifications of the leaf spring 203, and a center positioning pin can be provided in each vertical hole, so that the center positioning pin can enhance its reliability and avoid the problem of lateral displacement of the leaf spring 203 under the action of a large force. Furthermore, the thickness of the leaf spring 203 provided in the embodiment of the present application can be set according to actual use requirements, so as to ensure that the leaf spring 203 can bear a large force while also having high reliability.

[0033] Meanwhile, in the embodiment of the present application, a slide plate seat 204 is also provided at the edge of the leaf spring 203. Two slide plate seats 204 can be provided, and the two slide plate seats 204 are respectively provided on both sides of the leaf spring 203. Figure 2 In the structure, when setting the leaf spring 203, the length of the leaf spring 203 at the bottom can be set to the same length, such as from the bottom to the top, the length of the first layer of leaf spring 203 to the fifth layer of leaf spring 203 is set to the same length, at this time, the slide seat 204 clamps and fixes the first layer of leaf spring 203 to the fifth layer of leaf spring 203. Thereby avoiding the problem of side slip and deflection of the leaf spring 203 when subjected to lateral force. Among them, when connecting, the two slide seats 204 can contact the middle bridge 104 and the rear bridge 105 of the vehicle respectively. When transmitting force, it is transmitted to the leaf spring 203 through the slide seat 204 on the axle, so that the force in the vertical direction is transmitted to the leaf spring.

[0034] Furthermore, since the leaf spring 203 is engaged in the slide seat 204, when the leaf spring 203 is subjected to force, the leaf spring 203 will deform to a certain extent, such as changing in the length direction of the leaf spring 203, and then slide relative to the slide seat 204. Furthermore, in the embodiment of the present application, a balancing shaft 205 is also included. The balancing shaft 205 is arranged at the bottom of the vehicle body, and when installed, the balancing shaft 205 can be rigidly connected to the frame at the bottom of the vehicle body, so as to achieve the fixation of the balancing shaft 205. In the embodiment of the present application, the balancing shaft 205 can be arranged according to the structure of a conventional large vehicle, and will not be described in detail here.

[0035] In the embodiment of the present application, positioning parts 206 are further provided on both sides of the balancing shaft 205. Meanwhile, the leaf spring 203 is provided on the balancing shaft 205, and the balancing shaft 205 can be provided at the middle position of the leaf spring 203. Furthermore, the balancing shaft 205 can be provided protrudingly relative to one side of the leaf spring 203. In the embodiment of the present application, the positioning parts 206 are provided on both sides of the balancing shaft 205, and when provided, the two positioning parts 206 can be provided symmetrically relative to the center of the balancing shaft 205, thereby ensuring that the positioning parts 206 on the left and right sides have consistent effects on the riding bolts 202 fixed thereon, avoiding the problem of weighing deviation when weighing the load in the vehicle body, thereby improving the measurement accuracy of the weighing system in the embodiment of the present application.

[0036] Furthermore, the vehicle-mounted weighing system in the embodiment of the present application further includes a plurality of riding bolts 202 and a plurality of nuts 209, and each riding bolt 202 is fixed on the leaf spring cover 201 in cooperation with a nut 209. Specifically, a plurality of screw holes are also provided on the leaf spring cover 201. During installation, one end of the riding bolt 202 is set in the corresponding screw hole and is tightened and fixed by the nut 209. In the embodiment of the present application, when the nut 209 is tightened, the nut 209 is tightly fitted with the upper surface of the leaf spring cover 201 to prevent the problem of shaking of the riding bolt 202. At the same time, the other end of the riding bolt 202 is set in the positioning portion 206, such as in the screw hole of the positioning portion 206. At the same time, both ends of the riding bolt 202 are fixed by nuts, so that the leaf spring 203 is fixed and the purpose of force transmission is achieved.

[0037] In an embodiment of the present application, when setting the leaf spring cover 201, a row of screw holes are set on both sides of the leaf spring cover 201. Optionally, each row of screw holes is set to an even number. In this example, four screw holes are set in each row. In this way, a total of eight screw holes are set on the leaf spring cover 201. Correspondingly, a riding bolt 202 is set in each screw hole, and each riding bolt 202 is fixed by a nut 209.

[0038] Furthermore, for the riding bolts 202 on the same side, they are symmetrically arranged relative to the central axis BB' of the balancing shaft 205, and the direction of the central axis BB' can be a first direction. In this example, the first direction can be a vertical direction. The other end of the riding bolt is arranged on one side of the balancing shaft, such as two riding bolts 202 are arranged on the left side of the central axis of the balancing shaft 205, and two riding bolts 202 are arranged on the right side of the central axis of the balancing shaft 205. Furthermore, the riding bolts 202 on both sides of the leaf spring 203 can be symmetrically arranged relative to the axis CC of the leaf spring 203, wherein the axis of the leaf spring 203 can be an axis formed by the midpoints of the two short sides of the leaf spring 203, see Figure 2When subjected to force, since the riding bolts 202 on the same side are symmetrically arranged, the forces on both sides are also symmetrically distributed, thereby ensuring the balance of the force and further ensuring the measurement accuracy of the weighing system.

[0039] At the same time, each riding bolt 202 is tilted relative to the vertical center axis of the balance shaft 205. By tilting each riding bolt 202, the force on each riding bolt 202 is dispersed, thereby increasing the force borne by each riding bolt 202.

[0040] In the embodiment of the present application, two riding bolts 202 are respectively arranged on both sides of the central axis BB' of the balance shaft 205, and the spacing between each group of riding bolts 202 is the same. In each group, two riding bolts 202 are arranged in parallel, and the inclination angle between each riding bolt 202 and the central axis BB' is the same.

[0041] Furthermore, when multiple riding bolts 202 are provided, a smaller gap may be reserved between the riding bolts 202 and the inner leaf spring 203, or the riding bolts 202 on both sides may contact the leaf spring 203, so as to further strengthen the engagement with the inner leaf spring 203 through the contact. However, when the riding bolts 202 contact the leaf spring 203, the contact force will not affect the deformation force transmitted to the riding bolts 202 when the leaf spring 203 is deformed, so as to avoid the problem of measurement deviation during the measurement process.

[0042] Combination Figure 1 In the structure, the vertical center axis of the balance shaft 205 can also be DG. In this case, a first angle is set between the riding bolt 202 and the vertical center axis DG, and the first angle is α. Optionally, the first angle α is set to an acute angle, which can be set to 0°~30°. Optionally, the first angle α is selected to be 10°, 15°, 25°, or set according to a specific vehicle-mounted weighing system, and the first angle is adjustable. The values ​​of the angle α of different sizes are all within the protection scope of this application and will not be repeated here.

[0043] Furthermore, a mechanical sensor 210 is also provided on each riding bolt 202. For example, the mechanical sensor 210 is attached along the extension direction of the riding bolt 202. In this example, the mechanical sensor 210 includes a strain gauge, a sensor or other device that can measure stress or strain. In the following example, the mechanical sensor 210 is illustrated by taking a strain gauge as an example. When the leaf spring 203 is deformed, since the riding bolts 202 are fixed on both sides of the leaf spring 203, the riding bolt 202 will deform with the deformation of the leaf spring 203, so that the strain is transmitted to the riding bolt 202, and in this application, a strain gauge is provided on the riding bolt 202, so that the strain gauge can measure the strain of the riding bolt 202.

[0044] In the embodiment of the present application, when the strain gauges are installed, each strain gauge is set at the same height position, so that the force balance of the strain gauges can be effectively guaranteed to improve the measurement effect and accuracy.

[0045] Furthermore, when setting the strain gauge, it is set along the extension direction of each riding bolt 202 to ensure that the deformation of the riding bolt 202 is sensitively detected. At the same time, when affixing the strain gauge, it can be affixed to the middle part of each riding bolt 202 and symmetrically relative to the center of the riding bolt 202. In this way, when the riding bolt 202 is deformed, the deformation of the riding bolt 202 can be accurately detected, and the strain value of the riding bolt 202 can be accurately obtained, thereby improving the accuracy of subsequent on-board weighing.

[0046] Furthermore, the vehicle-mounted weighing system also includes a support beam 208, an arch bridge 207, and a connecting platform 212. Among them, the balance shaft 205 can be set on the support beam 208, the arch bridge 207 is set as an arc structure, and the two ends of the arch bridge 207 can be respectively connected to the two balance shafts 205. In the embodiment of the present application, when setting the shape and structure of the arch bridge 207, the arch height and length of the arch bridge 207 can be set according to the size of the actual product, and supported or fixed by the support beam 208. In this example, the support beam 208 can be set to support a flat steel plate structure, or according to the use requirements, the support beam 208 can be set to other rigid materials.

[0047] In the embodiment of the present application, when the connecting platform 212 is provided, a corresponding connecting hole is provided on the connecting platform 212 , and the connecting hole and the connecting rod are connected to the positioning portion 206 , so that the balancing shaft 205 can be correspondingly provided on the support beam 208 .

[0048] Furthermore, in the embodiment of the present application, when the leaf spring cover plate 201 is provided, a reinforcing rib 211 structure is also provided in the middle of the leaf spring cover plate 201, see Figure 2The leaf spring cover 201 in the embodiment of the present application has a straight strip-shaped reinforcing rib 211 arranged in the middle of the leaf spring cover 201 along the length direction of the leaf spring 203. In the embodiment of the present application, the height of the reinforcing rib 211 may be greater than the surface of the leaf spring cover 201, so as to enhance the rigidity of the reinforcing rib 211 and avoid the problem of breakage during use. In this way, by arranging the reinforcing rib 211 structure on the upper surface of the leaf spring cover 201, the strength of the leaf spring cover 201 is enhanced, thereby improving its quality and reliability. In the embodiment of the present application, after the above-mentioned components are arranged and installed, when the loading mass of the dump truck is weighed, the leaf spring will be deformed under the action of the vehicle body load, and the deformed leaf spring 203 will drive the riding bolt 202 to deform as well. In this way, the strain gauge arranged on the riding bolt 202 will monitor the stress magnitude when it is deformed, and then obtain the corresponding bearing load in the vehicle body according to the stress magnitude.

[0049] Combination Figure 1 The force diagram of the dump truck and Figure 2 In the weighing system, in the embodiment of the present application, for the body of the wide-body dump truck, the body 101 is relatively regular. After loading the crushed mineral material and sand and gravel, the conductive mass center of the loaded cargo mass is relatively fixed in the horizontal and longitudinal directions, wherein the longitudinal direction can be the direction of the vehicle body moving forward, and the transverse direction is opposite to the longitudinal direction, and the transverse direction can be the left and right direction. In this way, in the transverse direction, its mass center is at the transverse center of the vehicle body, and in the longitudinal direction, the distance from the center of the balance shaft 205 and the center of the front axle 103 is a predetermined value, that is, after the overall design of the wide-body dump truck is completed, the mass of the loaded cargo will be distributed to the balance shaft and the front axle 103 according to a predetermined ratio. The height of the cargo mass center changes according to the change of the cargo loading amount.

[0050] Based on the above principle, in the embodiment of the present application, the leaf spring is deformed under the action of the vehicle body load, the mechanical sensor detects the strain value of the riding bolt during deformation, and obtains the vehicle body load according to the strain value. Specifically, the vehicle-mounted weighing system can detect the change of tensile stress on the balance shaft 205 and the riding bolt 202, so as to detect the weight of the cargo on the vehicle in real time. Then, the center of gravity height of the vehicle can be calculated according to the predetermined density of the cargo. When the dump truck is working in bad road conditions, the dynamic load of the vehicle can be detected in real time according to the change of the riding bolt stress. The load weighing system provided in the embodiment of the present application can be used under complex working conditions with high measurement accuracy.

[0051] Specifically, before using the vehicle-mounted weighing system provided in the embodiment of the present application to weigh the loaded goods, the vehicle-mounted weighing system 106 needs to be calibrated. During the calibration, the dump truck needs to be unloaded and on a flat paved road surface, and the system will calibrate the strain of the strain gauge on the riding bolt 202.

[0052] Among them, if the strain of the strain gauge when no-load is consistent with the initial value calibrated in the system, the calibration is completed and weighing measurement can be performed. If there is a large deviation, it is necessary to tighten the nut on the side of the riding bolt 202 close to the leaf spring cover 201 to ensure the corresponding strain of the strain gauge when no-load. In the embodiment of the present application, the purpose of adjusting the preload force of the riding bolt can be achieved by directly tightening or loosening the nut on the leaf spring cover 201, which is simple to operate and highly practical.

[0053] See Figure 1 In the figure, since the installation angle of the riding bolt 202 is not consistent with the direction of gravity G, but presents a first angle α with the gravity G in the vertical direction, at this time, there will be a tensile force Q on the riding bolt 202 along its elongation direction. According to the decomposition of force, in the vertical direction, the component force corresponding to the riding bolt 202 is Q·cosα. At the same time, in the initial state, the riding bolt needs to have a relatively large pre-tightening force. On the one hand, the riding bolt 202 must withstand the downward pressure of the weight on the leaf spring, and on the other hand, the leaf spring 203 needs to be compressed to prevent the leaf spring 203 from loosening. Therefore, the riding bolt 202 is in a tensile state, and its internal stress is tensile stress. When the cargo is loaded in the vehicle body, the tensile stress of the riding bolt will increase due to the increase in the mass of the cargo.

[0054] For wide-body dump trucks for mining, the riding bolts 202 provided thereon need to exert a sufficiently large preload force, so that the leaf spring cover 201 presses the plurality of leaf springs 203 tightly against the balance shaft 205. In the following examples, it is assumed that the leaf spring cover 201 and the leaf spring 203 are always tightly fitted.

[0055] In this way, the vertical force is transmitted to the leaf spring 203 through the leaf spring slide plate seat 204 installed on the mid-car bridge 104 and the rear axle 105 on both sides of the balance shaft, causing the leaf spring 203 to deform. The deformed leaf spring 203 will cause strain in the riding bolt 202. By arranging a strain gauge on the riding bolt 202, the strain gauge can monitor the tensile stress value of the riding bolt 202 in real time and then weigh the weight inside the vehicle body 101.

[0056] Based on the above matching relationship and force transmission method, when the balancing shaft 205 is fixed and a unilateral load G / 2 is applied to the center of the leaf spring slide seat 204 on both sides of a set of leaf springs 203, the total load on the balancing shaft 205 is 2G=m0g+mg·L2 / (L1+L2), where m0 is the mass component of the leaf spring 203 at the balancing shaft 205 when unloaded (a constant value after the vehicle design is completed), G max =(1+k){(m0g+m maxg·L2 / (L1+L2))} / 2, g is the acceleration due to gravity, L1 is the distance between the center of mass of the loaded cargo and the balance shaft 205, L2 is the distance between the center of mass of the loaded cargo and the front axle 103, m max is the maximum allowable loading mass, and the variation range of G is 0~(1+k) times the mass on the leaf spring 203 when fully loaded, where k is the dynamic load coefficient. When determining the dynamic load coefficient k, k=3.5 is usually selected for severe road conditions.

[0057] In the embodiment of the present application, according to the above formula, by setting a reasonable pre-tightening force, the tensile stress on the riding bolt 202 is gradually increased from the unloaded state to the fully loaded state of the dump truck, and assuming that the riding bolt 202 set in the embodiment of the present application is 8 leaf springs 203 bearing force deformation, the force change of the leaf spring cover 201 is G-△Q=8(Q'-Q)cosα; Among them, Q is the preload force when the leaf spring 203 is not loaded, Q is the tension when the leaf spring 203 is loaded, △Q is the difference in external force required to overcome the deformation of the leaf spring cover plate 201 and the steel leaf spring 203 in the riding bolt 202 when the leaf spring 203 is loaded and unloaded, and δ is the difference in elastic deformation of the leaf spring cover plate 201 when the leaf spring 203 is loaded and unloaded; Among them, δ =(ε'-ε0)L / cosα; ε' is the strain of the riding bolt 202 when the leaf spring 203 is loaded, ε0 is the strain of the riding bolt 202 when the leaf spring 203 is not loaded, and L is the effective length of the riding bolt 202; 8(Cδ / cosα)·cosα=G-δ·(C1+C2); Among them, C is the stiffness of the riding bolt, C1 is the stiffness of the leaf spring cover, and C2 is the stiffness of each group of leaf springs. The above C, C1, and C2 can all be directly measured or obtained according to the product specification.

[0058] Furthermore, based on the above relationship, G=(8C+C1+C2)δ=(8C+C1+C2)(ε'-ε0)L / cosα; 2G = m0g + mg·L2 / (L1+L2); Then we can get: m=(2G-m0g)(L1+L2) / (g·L2); =2{(8C+C1+C2)δ-m0g}(L1+L2) / (g·L2); =2{(8C+C1+C2)(ε'-ε0)L / cosα-m0g}(L1+L2) / (g·L2); At the same time, let K = (8C + C1 + C2), where K is the vertical stiffness of the leaf spring system composed of multiple leaf springs.

[0059] From the above conclusions, it can be seen that there is a certain degree of linear relationship between the weight of the cargo loaded on the dump truck and the difference in the deformation of the steel plate cover. Since the above are theoretically derived data, in actual application, there will be certain deviations due to the operating conditions, but the deviation is within a small range and is acceptable and will not affect the above linear relationship.

[0060] Therefore, in the embodiment of the present application, by installing a mechanical sensor on the riding bolt, the mechanical sensor can accurately measure the strain value of the riding bolt after being subjected to tension.

[0061] The stiffness of the riding bolt 202, the leaf spring cover 201 and the leaf spring 203 is a constant after the design and production are completed. The effective length L of the riding bolt 202 is also a constant. The installation angle α of the riding bolt 202 is also a constant. A reasonable tightening torque is applied to the nut matching the riding bolt 202. The initial strain value ε0 of the riding bolt 202 can be measured by the strain gauge. ε' is the real-time strain value of the riding bolt 202 after the leaf spring is loaded.

[0062] The leaf spring 203 after pre-tightening the riding bolt 202 is subjected to a loading test. The loading force range of each set of leaf springs 203 is 0~G max , it can be concluded that K=C0+f(ε'-ε0), C0 is a constant, and f(ε'-ε0) is the corresponding relationship between the strain change of the riding bolt 202 and the change of the vertical stiffness of the leaf spring suspension system.

[0063] We can further obtain: m=2{[C0+f(ε'-ε0)](ε'-ε0)L / cosα-m0g}(L1+L2) / (g·L2).

[0064] The above strain value can be directly obtained from the data obtained by the strain gauge, and other parameters can also be directly obtained from the existing data. Substituting the strain value of the strain gauge into the above formula can directly obtain the total weight of the load in the dump truck body. The load obtained by the above weighing has higher accuracy and is more applicable.

[0065] The vehicle-mounted weighing system provided in the embodiment of the present application can detect the weight of the cargo on the vehicle in real time by detecting the change in the tensile stress of the balancing shaft riding bolt. By detecting the mass of the cargo on the vehicle, the center of gravity height of the vehicle can be calculated according to the predetermined cargo density. In bad road conditions, the dynamic load of the vehicle can be detected in real time according to the change in the stress of the riding bolt. The vehicle-mounted weighing system provided in the embodiment of the present application has high monitoring accuracy and a wide range of applications.

[0066] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, modified, rearranged, decomposed, combined, or deleted.

[0067] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A vehicle-mounted weighing system, characterized in that: include: Vehicle body; A balance shaft, arranged at the bottom of the vehicle body; a leaf spring, fixed on the balance shaft; A connecting mechanism, comprising a leaf spring cover plate and a plurality of riding bolts and nuts, wherein the leaf spring cover plate is clamped on the top of the leaf spring, one end of the riding bolt is connected to the leaf spring cover plate and fixed by the nut, and the other end of the riding bolt is arranged on one side of the balance shaft; A slide plate seat, the slide plate seat is arranged on both sides of the leaf spring; A mechanical sensor is provided on the riding bolt. The riding bolt is deformed under the action of the vehicle body load. The mechanical sensor detects the strain value of the riding bolt during deformation and obtains the vehicle body load according to the strain value.

2. The vehicle-mounted weighing system according to claim 1, characterized in that: The leaf spring is provided in plurality, and the plurality of leaf springs are stacked in sequence in a vertical direction, and the length of the leaf spring close to the balancing shaft is greater than the length of the leaf spring far from the balancing shaft.

3. The vehicle-mounted weighing system according to claim 2, characterized in that: The vehicle-mounted weighing system further includes a center positioning pin. The leaf spring is further provided with a vertical hole at the middle position of the balance shaft, and the center positioning pin is inserted into the vertical hole.

4. The vehicle-mounted weighing system according to claim 1, characterized in that: The vehicle body also includes a front axle, a middle axle and a rear axle arranged at different positions, the balance shaft is arranged on the middle axle and the rear axle, and the leaf springs are arranged in two groups, each group of leaf springs is reversely installed on the balance shaft.

5. The vehicle-mounted weighing system according to claim 1, characterized in that: Two rows of the riding bolts and the nuts are correspondingly arranged on both sides of the leaf spring cover plate. The nuts are arranged at the ends of the riding bolts and matched with the riding bolts, and the number of the riding bolts in each row is set to an even number.

6. The vehicle-mounted weighing system according to claim 1, characterized in that: The plurality of leaf springs are stacked along a first direction, and the saddle bolts are inclined relative to the first direction.

7. The vehicle-mounted weighing system according to claim 6, characterized in that: The riding bolt has a first angle with the first direction; Wherein, the first angle is set to be an acute angle.

8. The vehicle-mounted weighing system according to claim 6, characterized in that: The riding bolts located on the same side of the leaf spring cover are symmetrically arranged relative to the first direction, and the riding bolts on both sides of the leaf spring cover are symmetrically arranged relative to the axis of the leaf spring cover.

9. The vehicle-mounted weighing system according to claim 1, characterized in that: The connecting mechanism also includes a slide plate seat, and the slide plate seat is arranged at corresponding positions at both ends of the leaf spring.

10. A dump truck, characterized in that: The invention comprises the on-board weighing system as claimed in any one of claims 1 to 9.

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