Device for measuring vehicle weight

Abstract

The utility model relates to a device for measuring the weight of a vehicle, in particular to a device for measuring the weight of a vehicle, which comprises a vehicle girder, rectangular holes penetrating through the vehicle girder are symmetrically formed in two ends of the outer surface of the vehicle girder, and sliding rods are connected to the inner walls of the two rectangular holes in a sliding manner. The size and the shape of the outer surface of each sliding rod are matched with the size and the shape of the surface area of the inner wall of the corresponding rectangular hole, one ends of the two sliding rods extend out of one side of the vehicle girder, the two sliding rods horizontally move on the inner walls of the two rectangular holes correspondingly, and circular hooks are rotationally connected to the arc surfaces of the ends of the sides, extending out of the vehicle girder, of the two sliding rods correspondingly; the device for weighing the vehicle does not directly measure the load capacity of the vehicle, does not adopt a displacement sensor, skillfully utilizes a small-range force sensor to directly obtain the variable quantity of the force according to the variable quantity of the displacement, further obtains the load capacity of the vehicle according to the synchronous proportion, is simple to install and high in universality, and does not affect the structure of the original vehicle.

Description

Technical Field

[0001] The utility model relates to a device for measuring vehicle weight, in particular to a device for measuring vehicle weight. Background Art

[0002] Although there are many schemes for vehicle-mounted weighing sensor devices, they are generally divided into two categories: direct and indirect. The direct method uses a pressure sensor installed between the frame and the cargo box or on the spring steel plate of the car to directly detect the weight. Although this method has high measurement accuracy, the sensor group must bear the entire load and has high requirements for the sensor. However, due to the particularity of the structure of the load-carrying vehicle, such as compact vehicle structure, small installation space, frequent inertial impact, large wear and fatigue, and the installation process is very complicated, it is rarely used. The indirect method usually uses a displacement sensor to measure the deformation of the body structure such as leaf springs, tires, and frames due to load, and then indirectly obtains the load information through mathematical methods. The indirect method sensor has low accuracy and large errors due to the addition of an intermediate process. In addition, the above two types of weighing sensor devices (direct and indirect) will affect the original structural performance of the vehicle during installation, especially the direct vehicle-mounted weighing sensor device. The existence of the above factors makes it impossible to be widely used in the market, although the vehicle-mounted weighing market has a huge demand. Even in the car companies that produce vehicles, there are currently no such mature products in the current front-end market.

[0003] At present, although the direct vehicle-mounted weighing sensor device can directly obtain the vehicle weight, it mainly relies on a small and large-tonnage pressure sensor. This large-range pressure sensor is difficult to manufacture, has unstable performance, high cost, and is difficult to install and maintain. At the same time, due to the compact structure of the truck, small installation space, frequent inertial impact, large wear and fatigue, and the installation often affects the original vehicle structure, this greatly limits the application of vehicle-mounted direct sensing devices. Currently, there are very few applications on the market. The displacement sensor used in the indirect method is relatively low in cost, but due to the addition of an intermediate process, the accuracy is low, and the weight calculation usually simplifies the load-bearing component into a linear mechanical model, so the error is large. At the same time, the frame structure of different models is different, so the versatility is poor. There are many types of displacement sensors, which can be divided into contact and non-contact according to the measurement method. Non-contact sensors mainly include eddy current sensors, ultrasonic sensors, grating sensors and photoelectric sensors. Eddy current sensors have high measurement accuracy and resolution of um level, but small range and expensive price. Ultrasonic sensors are cheap, but the measurement accuracy is relatively low and they are suitable for long-distance measurement. Grating sensors also have high measurement accuracy and large range, but large size. Trucks work in harsh environment and are often subjected to various impact loads when driving. Contact sensors vibrate up and down with the body together with the springs and are easily damaged. Utility Model Content

[0004] The main purpose of the utility model is to provide a device for measuring vehicle weighing to solve the problems raised in the relevant technology. At present, although the direct vehicle-mounted weighing sensor device can directly obtain the vehicle-mounted weight, it mainly relies on a small-sized and large-tonnage range pressure sensor. This large-range pressure sensor is difficult to manufacture, has unstable performance, high cost, and is difficult to install and maintain. At the same time, due to the compact structure of the load-carrying vehicle, small installation space, frequent inertial impact, large wear and fatigue, and the installation often affects the original vehicle structure, this greatly limits the application of the vehicle-mounted direct sensor device. At present, it is rarely used in the market. The displacement sensor used in the indirect method has a lower cost, but due to the increase of the intermediate process, the accuracy is low, and the weight meter is The calculation usually simplifies the loaded parts into a linear mechanical model, so the error is large. At the same time, the frame structures of different models are different, so the versatility is poor. There are many types of displacement sensors, which can be divided into contact and non-contact according to the measurement method. The non-contact types mainly include eddy current sensors, ultrasonic sensors, grating sensors and photoelectric sensors. Eddy current sensors have high measurement accuracy and resolution of um level, but the range is small and the price is expensive. Ultrasonic sensors are cheap, but the measurement accuracy is relatively low and they are suitable for long-distance measurements. Grating sensors also have relatively high measurement accuracy and a large range, but they are large in size. Trucks work in harsh environments and are often subjected to various impact loads when driving. Contact sensors vibrate up and down with the body together with the springs and are easily damaged.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a device for measuring vehicle weight is provided, including a vehicle beam, and rectangular holes penetrating the vehicle beam are symmetrically opened at both ends of the outer surface of the vehicle beam, and the inner walls of the two rectangular holes are slidably connected with sliding rods, and the size and shape of the outer surface of the sliding rods are adapted to the size and shape of the surface area of ​​the inner wall of the rectangular holes. One end of the two sliding rods extends out of one side of the vehicle beam, and the two sliding rods move horizontally on the inner walls of the two rectangular holes respectively. The arc surfaces of the two sliding rods extending out of the end of one side of the vehicle beam are rotatably connected with round hooks, and the two round hooks are located in front of the two rectangular holes.

[0006] Furthermore, a spring steel plate is fixedly connected to the bottom of the outer surface of the two circular hooks, a horizontal spring is fixedly connected to the outer surface of the circular hook, a length adjuster is fixedly connected to the other end of the outer surface of the horizontal spring, the length adjuster and the horizontal spring are both located above the spring steel plate, and the length adjuster and the horizontal spring are both located on the side of the vehicle frame close to the circular hook.

[0007] Furthermore, the horizontal spring is parallel to the vehicle beam.

[0008] Furthermore, a force sensor is fixedly connected to one end of the outer surface of the length adjuster away from the horizontal spring, one side of the outer surface of the force sensor is fixedly installed to one side of the outer surface of the vehicle beam, and the force sensor is located above the spring steel plate.

[0009] Furthermore, the top end of the outer surface of the rectangular block overlaps with the bottom end of the spring steel plate, and the inner wall of the rectangular block is rotatably connected to an axle.

[0010] Furthermore, wheels are fixedly mounted on both ends of the axle, and the rectangular block and the spring steel plate are located between opposite surfaces of two wheels.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the vehicle weighing device does not directly measure the vehicle load weight, nor does it use a displacement sensor. It cleverly uses a spring displacement and a small-range force sensor to directly obtain the force change from the displacement change, and then obtains the vehicle load weight in a synchronous ratio. The utility model is simple to install, has strong versatility, and does not affect the structure of the original vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0013] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0014] Figure 3 This is a schematic diagram of the overall structure of Example 3 of the utility model.

[0015] Illustration: 1. Vehicle frame; 2. Rectangular hole; 3. Sliding rod; 4. Round hook; 5. Spring steel plate; 6. Force sensor; 7. Length adjuster; 8. Horizontal spring; 9. Rectangular block; 10. Axle; 11. Auxiliary plate; 12. Suspension connecting rod. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation method, structure, characteristics and effects of the utility model are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0017] Example 1

[0018] See also Figure 1As shown, the purpose of this embodiment is to provide a device for measuring vehicle weight, including a vehicle beam 1, and rectangular holes 2 penetrating the vehicle beam 1 are symmetrically opened at both ends of the outer surface of the vehicle beam 1, and the inner walls of the two rectangular holes 2 are slidably connected with slide bars 3, and the size and shape of the outer surface of the slide bars 3 are adapted to the size and shape of the inner wall surface area of ​​the rectangular holes 2. One end of the two slide bars 3 extends out of one side of the vehicle beam 1, and the two slide bars 3 move horizontally on the inner walls of the two rectangular holes 2 respectively. The arc surfaces of the two slide bars 3 extending out of the ends of one side of the vehicle beam 1 are rotatably connected with round hooks 4, and the two round hooks 4 are located in front of the two rectangular holes 2. By setting the rectangular holes 2 and the slide bars 3, the spring steel plate 5 can be extended and retracted following the pressure of the vehicle;

[0019] The bottom of the outer surface of the two round hooks 4 is fixedly connected with a spring steel plate 5, the outer surface of the round hook 4 is fixedly connected with a horizontal spring 8, and the other end of the outer surface of the horizontal spring 8 is fixedly connected with a length adjuster 7. The length adjuster 7 and the horizontal spring 8 are both located above the spring steel plate 5, and the length adjuster 7 and the horizontal spring 8 are both located on the side of the vehicle beam 1 close to the round hook 4. By setting the length adjuster 7, the distance between the spring steel plates 5 can be adjusted and changed, which is convenient for catering to the measurement of different vehicle models;

[0020] The horizontal spring 8 is parallel to the vehicle beam 1. By setting the horizontal spring 8, the slide bar 3 moves horizontally inside the rectangular hole 2.

[0021] One end of the outer surface of the length adjuster 7 away from the horizontal spring 8 is fixedly connected to a force sensor 6, one side of the outer surface of the force sensor 6 is fixedly installed with one side of the outer surface of the vehicle beam 1, and the force sensor 6 is located above the spring steel plate 5. By setting the force sensor 6, the measured vehicle weight is transmitted to the network device through the sensor, which is convenient for analysis and recording;

[0022] The top of the outer surface of the rectangular block 9 overlaps with the bottom of the spring steel plate 5, and the inner wall of the rectangular block 9 is rotatably connected with the axle 10. By setting the rectangular block 9, when the spring steel plate 5 is pressed downward, it will not press the axle 10, thereby preventing the axle 10 from being damaged;

[0023] Wheels are fixedly mounted on both ends of the axle 10, and the rectangular block 9 and the spring steel plate 5 are located between the opposite surfaces of the two wheels. The axle 10 and the rectangular block 9 are connected so that the car and the spring steel plate 5 are connected.

[0024] When the utility model is used in practice, the force sensor 6 is fixedly mounted on the vehicle beam 1, one end of the horizontal spring 8 is connected to the spring steel plate 5, and the other end is connected to the length adjuster 7 on the force sensor 6. Under the action of the vehicle-loaded weight (the vehicle-loaded weight is P), the spring steel plate 5 will be squeezed and bent (the stiffness coefficient of the spring steel plate 5 is K1), so its two ends will produce horizontal displacement (the displacement amount is L), which can drive the round hook 4 and the slide rod 3 to produce horizontal displacement, stretching the horizontal spring 8 (the deformation distance of the horizontal spring 8 is S, and the stiffness coefficient of the horizontal spring 8 is K2), so the vehicle The horizontal deformation of the vehicle spring steel plate 5 is equal to the horizontal displacement of the horizontal spring 8, so the vehicle weight is proportional to the horizontal displacement of the horizontal spring 8, and the deformation of the horizontal spring 8 is directly proportional to the force applied to the force sensor 6, so the magnitude of the force F applied to the force sensor 6 is F=K2S, and the vehicle weight P=K1L. Since the stiffness coefficient K1 of the spring steel plate 5 and the stiffness coefficient K2 of the horizontal spring 8 are both in a directly proportional relationship of linear elasticity, the reading of the force sensor is F and there is a one-to-one mapping relationship between the vehicle weight P, that is, the vehicle weight P=KF. In this way, the vehicle load can be measured.

[0025] Example 2

[0026] See also Figure 2 The difference between this embodiment and embodiment 1 is that an auxiliary plate 11 is fixedly mounted on the vehicle beam 1, and a suspension connecting rod 12 hingedly mounted on the vehicle beam 1 is provided on one side of the auxiliary plate 11, and the force sensor 6 is fixedly mounted on the auxiliary plate 11, one of the sliding rods 3 is fixedly mounted on the suspension connecting rod 12, and the other is fixedly mounted on the vehicle beam 1;

[0027] Under the action of the heavy object on the vehicle (the vehicle weight is P), the spring steel plate 5 will be squeezed and bent (the stiffness coefficient of the spring steel plate 5 is K1). When the spring steel plate 5 is bent and deformed, it drives the suspension connecting rod 11 to rotate and stretch the horizontal spring 8 (the deformation distance of the horizontal spring 8 is S, and the stiffness coefficient of the horizontal spring 8 is K2). Therefore, the horizontal deformation of the automobile spring steel plate 5 is equal to the horizontal displacement of the horizontal spring 8. Therefore, the vehicle weight is proportional to the horizontal displacement of the horizontal spring 8, and the deformation of the horizontal spring 8 is proportional to the force of the force sensor 6. Therefore, the magnitude of the force F received by the force sensor 6 is F=K2S, and the vehicle weight P=K1L. Since the stiffness coefficient K1 of the spring steel plate 5 and the stiffness coefficient K2 of the horizontal spring 8 are both in direct proportion to linear elasticity, the reading of the force sensor is F and the vehicle weight P is a one-to-one mapping relationship, that is, the vehicle weight P=KF. In this way, the vehicle load can be measured.

[0028] Example 3

[0029] See also Figure 3The difference between this embodiment and embodiment 1 is that both sides of the vehicle beam 1 are provided with suspension connecting rods 12 hingedly mounted thereto, the force sensor 6 is fixedly mounted on the auxiliary plate 11, the auxiliary plate 11 is fixed to the vehicle beam 1, and the two slide bars 3 are respectively fixedly mounted on the two suspension connecting rods 12;

[0030] Under the action of the heavy object on the vehicle (the vehicle load is P), the spring steel plate 5 will be squeezed and bent (the stiffness coefficient of the spring steel plate 5 is K1). When the spring steel plate 5 is squeezed and bent, the suspension connecting rods 11 on both sides of the vehicle frame 1 will rotate and stretch the horizontal spring 8 (the deformation distance of the horizontal spring 8 is S, and the stiffness coefficient of the horizontal spring 8 is K2). Therefore, the horizontal deformation of the automobile spring steel plate 5 is equal to the horizontal displacement of the horizontal spring 8. Therefore, the vehicle load is proportional to the horizontal displacement of the horizontal spring 8, and the deformation of the horizontal spring 8 is proportional to the force of the force sensor 6. Therefore, the magnitude of the force F received by the force sensor 6 is F=K2S, and the vehicle load P=K1L. Since the stiffness coefficient K1 of the spring steel plate 5 and the stiffness coefficient K2 of the horizontal spring 8 are both in direct proportion to linear elasticity, the reading of the force sensor is F and the vehicle load P is a one-to-one mapping relationship, that is, the vehicle load P=KF. In this way, the vehicle load can be measured.

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0032] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device for measuring vehicle weight, comprising a vehicle beam (1) and a rectangular block (9), characterized in that: Rectangular holes (2) penetrating the vehicle beam (1) are symmetrically provided at both ends of the outer surface of the vehicle beam (1); the inner walls of the two rectangular holes (2) are slidably connected with slide bars (3); the size and shape of the outer surface of the slide bars (3) are adapted to the size and shape of the inner wall surface area of ​​the rectangular holes (2); one end of the two slide bars (3) extends out of one side of the vehicle beam (1); the two slide bars (3) move horizontally on the inner walls of the two rectangular holes (2) respectively; the arc surfaces of the two slide bars (3) extending out of one side of the vehicle beam (1) are rotatably connected with round hooks (4); the two round hooks (4) are located in front of the two rectangular holes (2).

2. A device for measuring vehicle weight according to claim 1, characterized in that: The bottom of the outer surface of the two circular hooks (4) is fixedly connected with a spring steel plate (5), the outer surface of the circular hook (4) is fixedly connected with a horizontal spring (8), the other end of the outer surface of the horizontal spring (8) is fixedly connected with a length adjuster (7), the length adjuster (7) and the horizontal spring (8) are both located above the spring steel plate (5), and the length adjuster (7) and the horizontal spring (8) are both located on a side of the vehicle frame (1) close to the circular hook (4).

3. The device for measuring vehicle weight according to claim 2, characterized in that: The horizontal spring (8) is in a parallel state with the vehicle beam (1).

4. The device for measuring vehicle weight according to claim 3, characterized in that: A force sensor (6) is fixedly connected to one end of the outer surface of the length adjuster (7) away from the horizontal spring (8), one side of the outer surface of the force sensor (6) is fixedly mounted to one side of the outer surface of the vehicle frame (1), and the force sensor (6) is located above the spring steel plate (5).

5. The device for measuring vehicle weight according to claim 4, characterized in that: The top end of the outer surface of the rectangular block (9) overlaps the bottom end of the spring steel plate (5), and the inner wall of the rectangular block (9) is rotatably connected to an axle (10).

6. The device for measuring vehicle weight according to claim 5, characterized in that: Wheels are fixedly mounted on both ends of the axle (10), and the rectangular block (9) and the spring steel plate (5) are located between the opposite surfaces of the two wheels.

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