Piezoelectric resonant force measurement sensor and vehicle axle weighing structure
By setting up a piezoelectric resonant force measurement sensor that can be elastically bending and deformed on the mounting plate, the deformation bending of the mounting plate directly transmits the force to the piezoelectric resonant sensitive unit, the problems of low measurement accuracy and high cost in the prior art are solved, and the force measurement effect with high sensitivity and low cost are achieved.
Patent Information
- Application Number
- CN202422314698.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The existing force measuring sensors and vehicle-mounted weighing structures do not have obvious strain under external forces and the stress changes are not obvious, resulting in low measurement accuracy, poor sensitivity, complex structure and high production costs.
A mounting plate that can be elastically bent and deformed is adopted. The piezoelectric resonance sensitive unit is stressed through the deformation and bending of the mounting plate, and the stress is converted into an electrical signal. A subtractive groove is set on the mounting plate to facilitate deformation and is equipped with a protective cover for protection.
It realizes high sensitivity and high precision force measurement, strong anti-interference ability, simple structure and low production cost.
Smart Images
Figure CN223050766U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of force measurement sensors, and in particular to a piezoelectric resonant force measurement sensor and a vehicle axle weighing structure. Background Art
[0002] Monitoring and measuring the load condition is an important part of ensuring traffic safety. And with the strict control of freight overload in recent years, more attention has been paid to the vehicle load condition. For example, in a specific scenario, in order not to overload, a truck driver needs to rely on experience to judge whether it is overloaded when loading goods. However, when dealing with unfamiliar goods, it is difficult to judge whether it is overloaded by experience. After loading the goods, the truck is driven to a weighbridge for weighing. If it is overweight, it needs to return to the loading point for unloading; if it is not overweight, in order to achieve greater economic benefits, it often returns to continue loading until the critical load limit. This way of monitoring the vehicle load is relatively cumbersome; moreover, even a truck driver who is familiar with the goods and has rich experience is difficult to accurately estimate. Therefore, it is necessary to weigh through a force measurement sensor and a weighing structure. In some existing force measurement sensors and vehicle-mounted weighing structures, the strain generated by the sensitive unit of the sensor under an external force (pressure) is not obvious, and the stress change under different pressures is not obvious, resulting in low measurement accuracy and poor sensitivity; in addition, some existing force measurement sensors and vehicle-mounted weighing structures have a relatively complex structure and high production costs. Summary of the Utility Model
[0003] To solve at least one of the above problems, the utility model provides a piezoelectric resonant force measurement sensor, including: a mounting plate that can be elastically bent and deformed, a piezoelectric resonant sensitive unit is arranged on the mounting plate, the piezoelectric resonant sensitive unit abuts against the mounting plate, stress is generated on the piezoelectric resonant sensitive unit through the deformation and bending of the mounting plate, and the stress is converted into an electrical signal through the piezoelectric resonant sensitive unit. The mounting plate includes a mounting portion, and one side of the piezoelectric resonant sensitive unit abuts against the mounting portion; the utility model is provided with a mounting plate that can be elastically deformed. Through the bending deformation of the mounting plate after being subjected to the measured external force, the piezoelectric resonant sensitive unit is extruded for inductive force measurement. Only through one part of the mounting plate, the force is transmitted to the piezoelectric resonant sensitive unit for induction, the transmission is relatively direct, the induction is sensitive, the accuracy is high, and the anti-interference ability is strong; and the structure is simple and the production cost is low.
[0004] Optionally, a material reduction groove is arranged at the mounting portion to make the mounting portion easy to deform. The material reduction groove includes a groove, and the groove is used to reduce the width of the mounting portion. The mounting portion is located at the middle position of the mounting plate.
[0005] Optionally, the groove is in an isosceles trapezoid shape.
[0006] Optionally, the groove includes a first groove and a second groove, and the first groove and the second groove are symmetrically distributed on both sides of the mounting portion.
[0007] Optionally, a material removal groove is provided at the mounting portion to make the mounting portion easy to deform. The material removal groove further includes a mounting groove, and the mounting groove is provided on a side of the mounting portion close to the piezoelectric resonance sensitive unit, and one side of the piezoelectric resonance sensitive unit is placed in the mounting groove.
[0008] Optionally, the mounting groove is provided to penetrate along the width direction of the mounting portion.
[0009] Optionally, a protective cover corresponding to the piezoelectric resonance sensitive unit is provided on the mounting plate, and the piezoelectric resonance sensitive unit is placed inside the protective cover.
[0010] Optionally, the protective cover is filled with a soft sealing glue.
[0011] Optionally, the piezoelectric resonance sensitive unit includes a substrate, a strain gauge, and a processing chip. The strain gauge and the processing chip are both electrically connected to the substrate. The strain gauge is placed on a side of the substrate close to the mounting portion, the strain gauge abuts against the mounting portion, and the processing chip is placed on a side of the substrate away from the mounting portion.
[0012] Compared with the prior art, the piezoelectric resonance force measurement sensor of the present invention is provided with an elastically deformable mounting plate. Through the bending deformation of the mounting plate after being subjected to an external force to be measured, the piezoelectric resonance sensitive unit is squeezed for inductive force measurement. Only through one part of the mounting plate, the force is transmitted to the piezoelectric resonance sensitive unit for induction, and the transmission is relatively direct, with sensitive induction, high precision, and strong anti-interference ability; and the structure is simple and the production cost is low; a material removal groove is provided at the mounting portion to make the mounting portion easy to deform. The setting of the material removal groove makes it easier for the mounting plate and the mounting portion to bend and deform under the same force, and it is also easier to generate stress on the piezoelectric resonance sensitive unit, that is, the induction is more sensitive; when stressed, the bending deformation amplitude of the mounting plate and the mounting portion is also larger, so that the stress range generated on the piezoelectric resonance sensitive unit is larger, that is, the induction precision is higher; a protective cover corresponding to the piezoelectric resonance sensitive unit is provided on the mounting plate; the protective cover can protect the piezoelectric resonance sensitive unit, for example, play a protective role such as dust prevention, waterproofing, and anti-collision, making the piezoelectric resonance sensitive unit operate stably, reliable in use, not easily damaged, and having a long service life.
[0013] The present invention also provides a vehicle axle weighing structure, including the above-mentioned piezoelectric resonance force measurement sensor, and the piezoelectric resonance force measurement sensor is arranged on the vehicle axle; this vehicle axle weighing structure also has the beneficial effects of the above-mentioned piezoelectric resonance force measurement sensor, which will not be elaborated here. Description of the Drawings
[0014] Figure 1 This is a perspective view of the piezoelectric resonant force measurement sensor of the present utility model;
[0015] Figure 2 This is an exploded view of the piezoelectric resonant force measurement sensor of the present utility model;
[0016] Figure 3 This is a cross-sectional view of the piezoelectric resonant force measurement sensor of the present utility model;
[0017] Figure 4 This is a top view of the piezoelectric resonant force measurement sensor of the present utility model;
[0018] Figure 5 This is a bottom view of the piezoelectric resonant force measurement sensor of the present utility model;
[0019] Figure 6 This is a schematic structural diagram of the vehicle wheel axle weighing structure of the present utility model;
[0020] The corresponding component names for the reference numerals in the figure are: 1 is the mounting plate, 10 is the material removal groove, 101 is the mounting part, 102 is the groove, 1021 is the first groove, 1022 is the second groove, 103 is the mounting groove, 2 is the piezoelectric resonant sensing unit, 21 is the substrate, 22 is the strain gauge, 23 is the processing chip, 3 is the protective cover, 4 is the soft sealant, 5 is the vehicle wheel axle, 6 is the bolt hole, and 7 is the wheel. Detailed implementation manners
[0021] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings.
[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship during the normal use of the product.
[0023] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.
[0024] Refer to Figures 1 - 5, an embodiment of the present utility model provides a piezoelectric resonant force measurement sensor, including: a mounting plate 1 that can be elastically bent and deformed, and the mounting plate 1 is made of a metal material such as stainless steel; a piezoelectric resonant sensitive unit 2 is arranged on the mounting plate 1, and in this embodiment, the piezoelectric resonant sensitive unit 2 is placed on the upper side of the mounting plate 1; the piezoelectric resonant sensitive unit 2 has the advantages of sensitive induction, high precision, strong anti-interference ability, etc., and in this embodiment, a quartz piezoelectric resonant sensitive unit 2 is adopted; the piezoelectric resonant sensitive unit 2 and the mounting plate 1 are fixed by means of glue, welding, etc.; the piezoelectric resonant sensitive unit 2 abuts against the mounting plate 1, and stress is generated on the piezoelectric resonant sensitive unit 2 through the deformation and bending of the mounting plate 1, and the stress is converted into an electrical signal through the piezoelectric resonant sensitive unit 2, avoiding a large force directly acting on the piezoelectric resonant sensitive unit 2 and causing it to be damaged; the mounting plate 1 includes a mounting portion 101, and one side of the piezoelectric resonant sensitive unit 2 abuts against the mounting portion 101; the present utility model is provided with an elastically deformable mounting plate, and the piezoelectric resonant sensitive unit is extruded for induction force measurement through the bending deformation of the mounting plate after being subjected to the measured external force. The force is transmitted to the piezoelectric resonant sensitive unit for induction only through one part of the mounting plate, and the transmission is relatively direct, with sensitive induction, high precision, and strong anti-interference ability; and the structure is simple and the production cost is low.
[0025] Refer to Figures 2 - 5 , a material reduction groove 10 is arranged at the mounting portion 101 to make the mounting portion 101 easy to deform. The setting of the material reduction groove 10 makes the mounting plate 1 and the mounting portion 101 more easily bent and deformed under the same force, and it is also easier to generate stress on the piezoelectric resonant sensitive unit 2, that is, the induction is more sensitive; when stressed, the bending deformation amplitude of the mounting plate 1 and the mounting portion 101 is also larger, making the stress range generated on the piezoelectric resonant sensitive unit 2 larger, that is, the induction precision is higher; the material reduction groove 10 includes a groove 102, and the groove 102 is used to reduce the width of the mounting portion 101 (the width is Figure 2 the distance in the Y-axis direction in), the mounting portion 101 is located at the middle position or approximately the middle position of the mounting plate 1. When bending, the deformation amplitude of the middle position of the mounting plate 1 is the largest, improving the sensitivity and precision of the piezoelectric resonant sensitive unit 2; the groove 102 is in an isosceles trapezoid shape to facilitate the deformation of the mounting portion 101, and the groove 102 can also be set to other shapes that are easy to deform; the groove 102 includes a first groove 1021 and a second groove 1022, and the first groove 1021 and the second groove 1022 are symmetrically distributed on both sides of the mounting portion 101. The addition of the groove increases the material reduction amount and is conducive to the deformation of the mounting portion 101.
[0026] Refer to Figure 2 , Figure 3 and Figure 5The mounting portion 101 is provided with a material reduction groove 10 to make the mounting portion 101 easy to deform. The material reduction groove 10 also includes a mounting groove 103. The mounting groove 103 is provided on one side of the mounting portion 101 close to the piezoelectric resonance sensitive unit 2. The mounting groove 103 is used to reduce the thickness of the mounting portion (the thickness is Figure 2 The distance in the middle Z-axis direction), one side of the piezoelectric resonance sensitive unit 2 is placed in the installation groove 103, so that the installation part 101 is further reduced in material, easier to deform, and further improves the sensitivity and accuracy of the induction; in addition, the piezoelectric resonance sensitive unit 2 is not prone to large displacement during installation, ensuring the accuracy of the installation position (that is, located in a relatively central position) and ensuring reliability; specifically, the lower side of the piezoelectric resonance sensitive unit 2 is placed in the installation groove 103; the installation groove 103 is set through along the width direction of the installation part 101, and the through setting can reduce more materials than the non-through setting, and it is easier for the installation part 101 to deform.
[0027] See also Figure 2 , Figure 3 and Figure 5 A protective cover 3 corresponding to the piezoelectric resonance sensitive unit 2 is provided on the mounting plate 1, and the piezoelectric resonance sensitive unit 2 is placed on the inner side of the protective cover 3. The protective cover 3 and the mounting plate 1 are fixed by glue, welding, etc. The protective cover 3 can protect the piezoelectric resonance sensitive unit 2, such as dustproof, waterproof, anti-collision and other protective functions, so that the piezoelectric resonance sensitive unit 2 can run stably, use reliably, not easy to be damaged, and have a long service life; the protective cover 3 is filled with soft sealant 4, which has good waterproof sealing performance, improves dustproof and waterproof performance, impact resistance, and is easy to deform with the mounting plate 1; if it is filled with hard glue, it will be unfavorable for the deformation of the mounting part. In this embodiment, the soft sealant 4 is epoxy resin glue; piezoelectric resonance The sensitive unit 2 includes a substrate 21, a strain gauge 22 and a processing chip 23. The strain gauge 22 and the processing chip 23 are both electrically connected to the substrate 21. The strain gauge 22 is placed on a side of the substrate 21 close to the mounting portion 101, so that the strain gauge 22 is squeezed by the mounting portion 101 to generate stress and is sensitive. The strain gauge 22 is against the mounting portion 101, and the processing chip 23 is placed on a side of the substrate 21 away from the mounting portion 101 to avoid damage to the chip due to the large stress of the mounting portion 101. The structure is reliable and stable with a long service life. The substrate 21 is connected to an external device through a wire to transmit the signal to the external device. Bolt holes 6 are provided on the mounting plate 1 to facilitate fixing the mounting plate 1 to an external part by bolts.
[0028] Compared with the prior art, the piezoelectric resonant force measurement sensor of the present utility model is provided with an elastically deformable mounting plate. Through the bending deformation of the mounting plate after being subjected to the external force to be measured, the piezoelectric resonant sensitive unit is squeezed for induction force measurement. Only through one part, namely the mounting plate, the force is transmitted to the piezoelectric resonant sensitive unit for induction, and the transmission is relatively direct, with sensitive induction, high precision, and strong anti-interference ability; moreover, the structure is simple and the production cost is low; a material-removing groove is provided at the mounting part to make the mounting part easy to deform. The setting of the material-removing groove makes it easier for the mounting plate and the mounting part to bend and deform under the same force, and it is also easier to generate stress on the piezoelectric resonant sensitive unit, that is, the induction is more sensitive; when stressed, the bending deformation amplitude of the mounting plate and the mounting part is also larger, making the stress range generated on the piezoelectric resonant sensitive unit larger, that is, the induction precision is higher; a protective cover corresponding to the piezoelectric resonant sensitive unit is provided on the mounting plate; the protective cover can play a protective role for the piezoelectric resonant sensitive unit, such as dust-proof, waterproof, anti-collision and other protective functions, making the piezoelectric resonant sensitive unit operate stably, be reliable in use, not easy to be damaged, and have a long service life.
[0029] The present utility model also provides a vehicle wheel axle weighing structure, which includes the above-mentioned piezoelectric resonant force measurement sensor. The piezoelectric resonant force measurement sensor is arranged on the vehicle wheel axle 5. The vehicle wheel axle 5 is the connecting axle between the wheels 7. When the vehicle is running, the wheels rotate while the vehicle wheel axle does not rotate; according to requirements and installation conditions, it can be selected to fix the mounting plate of the piezoelectric resonant force measurement sensor on the upper side, front side or rear side of the vehicle wheel axle 5. Figure 6 In the figure, the mounting plate is fixed on the upper side of the vehicle wheel axle 5; the mounting plate 1 is fixed on the vehicle wheel axle 5 by means of bolts, glue, welding, etc. The heavier the vehicle load, the greater the downward bending degree of the vehicle wheel axle 5, and the greater the deformation transmitted to the mounting plate 1. After being sensed by the piezoelectric resonant force measurement sensor, the vehicle load value is calculated through an algorithm program. By using the deformation of the vehicle wheel axle and the mounting plate 1 to make the piezoelectric resonant sensitive unit 2 generate strain for induction, it is avoided that a large resultant force of the vehicle and its load directly acts on the piezoelectric resonant sensitive unit 2 to cause damage. The weighing function is realized through the load deformation of the vehicle wheel axle. The design is ingenious, the structure is simple, and the production and maintenance costs are low; this vehicle wheel axle weighing structure also has the beneficial effects of the above-mentioned piezoelectric resonant force measurement sensor, that is, the weighing is sensitive, reliable, high-precision, etc., which will not be elaborated here.
[0030] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.
Claims
1. A piezoelectric resonant force measurement sensor, characterized in that: include: A mounting plate (1) capable of elastic bending and deformation, wherein a piezoelectric resonance sensitive unit (2) is arranged on the mounting plate (1), the piezoelectric resonance sensitive unit (2) abuts against the mounting plate (1), stress is generated on the piezoelectric resonance sensitive unit (2) through deformation and bending of the mounting plate (1), and the stress is converted into an electrical signal through the piezoelectric resonance sensitive unit (2), the mounting plate (1) comprises a mounting portion (101), and one side of the piezoelectric resonance sensitive unit (2) abuts against the mounting portion (101).
2. The piezoelectric resonant force measurement sensor according to claim 1, characterized in that: A material-reducing groove (10) is provided at the mounting portion (101) to facilitate deformation of the mounting portion (101); the material-reducing groove (10) comprises a groove (102) for reducing the width of the mounting portion (101); the mounting portion (101) is located in the middle of the mounting plate (1).
3. The piezoelectric resonant force measurement sensor according to claim 2, characterized in that: The groove (102) is in the shape of an isosceles trapezoid.
4. The piezoelectric resonant force measurement sensor according to claim 2, characterized in that: The groove (102) comprises a first groove (1021) and a second groove (1022), and the first groove (1021) and the second groove (1022) are symmetrically distributed on two sides of the mounting portion (101).
5. The piezoelectric resonant force measurement sensor according to claim 1, characterized in that: The mounting portion (101) is provided with a material-reducing groove (10) to facilitate deformation of the mounting portion (101); the material-reducing groove (10) further comprises a mounting groove (103); the mounting groove (103) is provided on a side of the mounting portion (101) close to the piezoelectric resonance sensitive unit (2); and one side of the piezoelectric resonance sensitive unit (2) is placed in the mounting groove (103).
6. The piezoelectric resonant force measurement sensor according to claim 5, characterized in that: The mounting groove (103) is arranged to penetrate along the width direction of the mounting portion (101).
7. The piezoelectric resonant force measurement sensor according to claim 1, characterized in that: The mounting plate (1) is provided with a protective cover (3) corresponding to the piezoelectric resonance sensitive unit (2), and the piezoelectric resonance sensitive unit (2) is placed inside the protective cover (3).
8. The piezoelectric resonant force measurement sensor according to claim 7, characterized in that: The protective cover (3) is filled with soft sealing glue (4).
9. The piezoelectric resonant force measurement sensor according to any one of claims 1 to 8, characterized in that: The piezoelectric resonance sensitive unit (2) comprises a substrate (21), a strain gauge (22) and a processing chip (23); the strain gauge (22) and the processing chip (23) are both electrically connected to the substrate (21); the strain gauge (22) is placed on a side of the substrate (21) close to the mounting portion (101); the strain gauge (22) abuts against the mounting portion (101); and the processing chip (23) is placed on a side of the substrate (21) away from the mounting portion (101).
10. A vehicle axle weighing structure, characterized in that: The piezoelectric resonant force measuring sensor comprises a piezoelectric resonant force measuring sensor according to any one of claims 1 to 9, wherein the piezoelectric resonant force measuring sensor is arranged on a wheel axle (5) of a vehicle.