CN112362317A - Plate spring testing device and plate spring testing method - Google Patents
Plate spring testing device and plate spring testing method Download PDFInfo
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- CN112362317A CN112362317A CN201910668564.5A CN201910668564A CN112362317A CN 112362317 A CN112362317 A CN 112362317A CN 201910668564 A CN201910668564 A CN 201910668564A CN 112362317 A CN112362317 A CN 112362317A
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Abstract
The present disclosure relates to a leaf spring testing apparatus and a leaf spring testing method, wherein the leaf spring testing apparatus includes a supporting mechanism for mounting both ends of a leaf spring to suspend the leaf spring; the pressure mechanism is used for applying pressure to the plate surface of the plate spring; and the measuring system is used for acquiring the coordinates of a preset measuring point so as to acquire the track of the measuring point in the process of pressing the plate spring by the pressure mechanism, wherein the measuring point is formed on the plate spring or an auxiliary frame fixedly connected with the plate spring. The method comprises the steps that the two ends of a plate spring are installed on a supporting mechanism, the plate spring is suspended, in the process that a pressure mechanism applies pressure to the plate spring, coordinates of measuring points under different pressures are obtained through a measuring system, the measuring result obtained by measuring the plate spring through the measuring device disclosed by the invention is compared with the measuring result obtained by theoretical analysis, a theoretical analysis method is improved, the accuracy of the simulation analysis method is further improved, accurate checking of design and analysis of the plate spring is realized, and the development period of a project is shortened.
Description
Technical Field
The disclosure relates to the technical field of testing, in particular to a plate spring testing device and a plate spring testing method.
Background
The plate spring is a plate spring formed by overlapping and combining a plurality of pieces of spring steel. The leaf spring is generally applied to a vehicle suspension and has the functions of connecting a vehicle frame and an axle together in a suspension mode, bearing load impact of wheels on the vehicle frame, reducing violent vibration of a vehicle body, and keeping the running stability of the vehicle and the adaptability to different road conditions. In the prior art, a mapping method or a CAE (computer aided engineering) operation analysis method is usually adopted to test a plate spring, so that the motion trail of the plate spring under a specific working condition is obtained, and then the plate spring is applied to design analysis for checking. However, since the plate spring is a very complicated analysis model, the results obtained by theoretical methods such as a mapping method and CAE arithmetic analysis are often different from the actual situation of the plate spring. Because the theoretical analysis method is immature, the obtained analysis result is unreliable, so that the design quality of the plate spring cannot be guaranteed, the plate spring needs to be adaptively adjusted in the later stage of vehicle development, and the development period of a project is delayed.
Disclosure of Invention
The purpose of this disclosure is to provide leaf spring testing arrangement and leaf spring test method to solve the inaccurate problem of simulation analysis of leaf spring among the relevant art.
In order to achieve the above object, the present disclosure provides a leaf spring testing device, including: a support mechanism for mounting both ends of a plate spring to suspend the plate spring; the pressure mechanism is used for applying pressure to the plate surface of the plate spring; and the measuring system is used for acquiring the coordinates of a preset measuring point so as to acquire the track of the measuring point in the process of pressing the plate spring by the pressure mechanism, wherein the measuring point is formed on the plate spring or an auxiliary frame fixedly connected with the plate spring.
Optionally, the sub-frame is included for fixed connection with the leaf spring, the sub-frame includes a bottom plate mountable on a top surface of the leaf spring and a side plate extending at an angle to the bottom plate, the measuring point being formed on the side plate.
Optionally, the number of the measuring points is two, and the two measuring points are symmetrically arranged on two sides of the longitudinal center line of the plate spring.
Optionally, the support mechanism includes two mounting seats fixedly mounted on a horizontal plane, one of the mounting seats is mounted to one end of the plate spring through a pin, and the other mounting seat is mounted to the other end of the plate spring through a lifting lug.
Optionally, the measuring system includes a first pull line sensor and a second pull line sensor fixed in position relative to the supporting mechanism, and the line ends of the first pull line sensor and the second pull line sensor are respectively connectable to the measuring point, so that the first pull line sensor, the second pull line sensor and the measuring point form a virtual triangle.
According to a second aspect of the present disclosure, there is also provided a leaf spring testing method, including: mounting both ends of a plate spring on a support mechanism to suspend the plate spring; acquiring initial coordinates of a preset measuring point; pressing the plate surface of the plate spring; acquiring the end point coordinates of the measuring points, wherein the measuring points are formed on the plate spring or an auxiliary frame fixedly connected with the plate spring.
Optionally, a first pull wire sensor and a second pull wire sensor are fixedly disposed opposite to the supporting mechanism, wire ends of the first pull wire sensor and the second pull wire sensor are respectively connectable to the measuring points, so that the first pull wire sensor, the second pull wire sensor and the measuring points form a virtual triangle, and the step of acquiring the end point coordinates of the measuring points includes: and acquiring the distance between a first wire outlet hole of the first pull wire sensor and a first line segment formed by connecting the measuring points, the distance between a second wire outlet hole of the second pull wire sensor and a second line segment formed by connecting the measuring points and the distance between the first wire outlet hole and a third line segment formed by connecting the second wire outlet hole.
Optionally, the number of the measuring points is two, and the two measuring points are symmetrically arranged on two sides of the longitudinal center line of the plate spring.
Optionally, the method further comprises: after the step of obtaining the terminal point coordinate of the measuring point, obtaining a return coordinate of the measuring point after force is removed; returning to the step of mounting both ends of the plate spring on the support mechanism to suspend the plate spring if the return coordinates are different from the initial coordinates.
Optionally, the method further comprises: repeatedly pressing the plate spring three times with a first preset pressure before the step of pressing the plate surface of the plate spring.
According to the technical scheme, when the plate spring needs to be tested, firstly, two ends of the plate spring are installed on the supporting mechanism, the plate spring is suspended, in the process that the pressure mechanism applies pressure to the plate spring, coordinates of measuring points under different pressures are obtained through the measuring system, the motion tracks corresponding to the corresponding measuring points of the plate spring can be obtained through the sequential connection of the coordinates, the measuring result obtained by measuring the plate spring by adopting the measuring device disclosed by the invention is compared with the measuring result obtained by adopting theoretical analysis, the theoretical analysis method is improved, the accuracy of the simulation analysis method is further improved, the accurate checking of the design analysis of the plate spring is realized, the design quality of the plate spring is ensured, the situation that the plate spring needs to be subjected to adaptive adjustment in the later development stage due to unreliable theoretical analysis results is avoided, and the development period of a project is shortened.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic structural view of a leaf spring provided in an exemplary embodiment of the present disclosure after being mounted in a leaf spring testing device;
FIG. 2 is a schematic structural view of a pressure mechanism according to an exemplary embodiment of the present disclosure before and after applying pressure to a leaf spring;
FIG. 3 an exemplary embodiment of the present disclosure provides a schematic diagram of the structure between the first pull wire sensor, the second pull wire sensor and the measurement point;
FIG. 4 is a flow chart of a leaf spring testing method provided by an exemplary embodiment of the present disclosure;
FIG. 5 is a flow chart of a leaf spring testing method provided by another exemplary embodiment of the present disclosure;
FIG. 6 is a flow chart of a leaf spring testing method provided by another exemplary embodiment of the present disclosure;
fig. 7 is a flowchart of a leaf spring testing method provided in another exemplary embodiment of the present disclosure.
Description of the reference numerals
1 horizontal plane 2 plate spring
3 measuring point 4 mounting base
5 lifting lug 61 bottom plate
62 side plate 71 first stay wire sensor
72 second pull sensor
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, unless otherwise specified, the use of directional terms such as "inner" and "outer" are used with respect to the self-outline of the component parts, and the use of "first" and "second" in the present disclosure is intended to distinguish one element from another element without order or importance. The following description refers to the accompanying drawings, in which like references in different drawings represent the same or similar elements, unless otherwise indicated.
As shown in fig. 1 to 3, the present disclosure provides a leaf spring testing apparatus, which includes a supporting mechanism, a pressure mechanism, and a measuring system; the supporting mechanism is used for mounting two ends of the plate spring 2 so as to suspend the plate spring 2; the pressure mechanism is used for applying pressure to the plate surface of the plate spring 2; and the measuring system is used for acquiring the coordinates of a preset measuring point 3 so as to obtain the track of the measuring point 3 according to the acquired coordinates of the measuring point 3 in the process of pressing the plate spring 2 by the pressure mechanism, wherein the measuring point 3 is formed on the plate spring 2 or an auxiliary frame fixedly connected with the plate spring 2. The supporting mechanism can be placed on a horizontal plane 1, the mode of suspending the plate spring 2 of the supporting mechanism simulates the installation mode of the plate spring 2 when the plate spring 2 is installed in a scene where the supporting mechanism is applied, and the supporting mechanism can simulate the installation structure of suspending the plate spring 2 on a vehicle, so that the working condition of the plate spring 2 is consistent with the condition of installing the plate spring 2 on the vehicle. It should be noted that the magnitude of the pressure applied to the plate spring 2 by the pressure mechanism is set according to the pressure that the plate spring 2 can bear when the plate spring 2 is designed, for example, the magnitude may be 1.5 times of the full load of the plate spring 2 mounted on the vehicle, but the maximum magnitude does not exceed the maximum limit that the plate spring 2 can bear, the position where the pressure mechanism applies pressure to the plate spring 2 may also be set according to the stress point when the plate spring 2 is mounted on the vehicle, for example, the pressure may be applied to the middle of the plate surface of the plate spring 2, and fig. 2 is a schematic structural diagram before and after the pressure mechanism applies pressure to the plate spring (the. In the embodiment of the present disclosure, the measuring point 3 may be a point on the plate spring 2 itself, or may be a point on a sub-frame fixedly connected to the plate spring 2, that is, when the plate spring 2 is moved by the pressure mechanism pressing the plate spring 2, the sub-frame is also formed such that a part of the plate spring 2 moves in synchronization with the plate spring 2.
Through the technical scheme, when the plate spring 2 needs to be tested, the two ends of the plate spring 2 are installed on the supporting mechanism at first, so that the plate spring 2 is suspended, and the arrangement mode and the stress form of the plate spring in actual use are simulated by applying pressure to the plate surface. In the process that the pressure mechanism applies pressure to the plate surface, coordinates of the measuring points 3 under different pressures are obtained through the measuring system, the obtained coordinates are sequentially connected to obtain the motion tracks corresponding to the corresponding measuring points 3 of the plate spring 2, the measuring result obtained by measuring the plate spring by using the measuring device disclosed by the invention is compared with the measuring result obtained by adopting theoretical analysis, the theoretical analysis method is improved, the accuracy of the simulation analysis method is further improved, accurate checking of design and analysis of the plate spring 2 is realized, the design quality of the plate spring is ensured, the situation that the plate spring needs to be adaptively adjusted in the later development stage due to unreliable theoretical analysis results is avoided, and the development period of a project is shortened.
In the embodiment of the present disclosure, the plate spring testing apparatus further includes an auxiliary frame fixedly connected to the plate spring 1, the measuring point 3 is disposed on the auxiliary frame fixedly connected to the plate spring 2, and the measuring point 3 can be pulled out from the plate spring 2 itself, so that it is avoided that the measuring point 3 is slightly deformed due to vibration or extrusion when the pressure mechanism applies pressure to the plate spring 2, and the coordinate of the measuring point 3 is affected, so that the measuring result is not accurate enough. Through the mode that sets up the auxiliary frame, can effectively improve measuring result's precision and reliability. According to an embodiment of the present disclosure, referring to fig. 1 and 2, the sub-frame may include a bottom plate 61 capable of being mounted on the top surface of the plate spring 2 and a side plate 62 extending at an angle to the bottom plate 61, the measuring point 3 being formed on the side plate 62. The shape of bottom plate 61 can match with the surface of leaf spring 2 for bottom plate 61 laminating is installed on leaf spring 2, guarantees the stability of subframe installation. In this way, when the pressure mechanism applies pressure to the plate spring 2, the pressure mechanism can be formed to directly press on the bottom plate 61, and thus, through the isolation of the bottom plate 1, the pressure mechanism can also be prevented from directly applying pressure to the plate spring 2, so that the plate spring 2 is prevented from generating micro-deformation and affecting the measurement result. The sub-frame is preferably a light plate, and the weight of the sub-frame is negligible to the pressure of the plate spring 2. The side plate 62 is angled from the bottom plate 61 to pull the measuring point 3 to a greater extent from the position where the pressure mechanism applies pressure to the plate spring 2, and the present disclosure does not limit the extending angle and length of the side plate 62, such as extending to a position where the operator can measure the measuring point 3 without affecting the operation of the pressure mechanism, such as extending to both sides of the plate spring 2 in fig. 1 and 2.
In the embodiment of the present disclosure, the number of the measuring points 3 is not limited to one, and may be a plurality of measuring points, so that the measuring result is accurate, for example, the number of the measuring points 3 may be two, and in order to ensure the accuracy of the result, two or more measuring points 3 may be symmetrically disposed on both sides of the longitudinal center line of the plate spring 2. When the measuring points 3 are provided on the side plates 62, the sub-frame may be formed in a symmetrical structure, that is, may have two side plates 62 or may have a plurality of side plates 62 divergently extending from the bottom plate 61, and the plurality of measuring points 3 may be provided on two or more side plates 62, respectively.
In order to simulate the structure in which the leaf spring 2 is mounted on a vehicle, as shown in fig. 1 and 2, the support mechanism may include two mounting seats 4 fixedly mounted on the horizontal plane 1, one mounting seat 4 being mounted to one end of the leaf spring 2 by a pin, and the other mounting seat 4 being mounted to the other end of the leaf spring 2 by a lug. In this way, the installation mode of the plate spring 2 and the installation mode thereof on the vehicle can be realized, and the accuracy of the test result of the plate spring 2 is ensured. When the leaf spring 2 is mounted in other mounting manners on a vehicle or other device, the structure of the support mechanism can also be adjusted to the respective mounting manner.
According to one embodiment of the present disclosure, the pressure mechanism may be a hydraulic cylinder. The hydraulic cylinders may be operated by an externally connected hydraulic control system. The hydraulic cylinder may press on the middle of the plate surface of the leaf spring 2 or on the bottom plate 61 as described above, so that the leaf spring 2 has a tendency to arch downwards. In other embodiments, the pressure mechanism may also be a motor-driven pressure mechanism or a pneumatic-driven pressure mechanism, which is not limited in this disclosure.
Specifically, as shown in fig. 1 to 3, the measuring system includes a first pull sensor 71 and a second pull sensor 72 fixed in position relative to the support mechanism, and the wire ends of the first pull sensor 71 and the second pull sensor 72 can be connected to the measuring point 3, respectively, so that the first pull sensor 71, the second pull sensor 72, and the measuring point 3 enclose a virtual triangle. As a vertical portion may be vertically formed on the above-described horizontal plane 1, the first pull sensor 71 and the second pull sensor 72 may be fixed on the vertical portion. The first stay wire sensor 71 can obtain the length of a first line segment between a first wire outlet hole and the measuring point 3, the second stay wire sensor 72 can obtain the length of a second line segment between a second wire outlet hole and the measuring point 3, the length of a third line segment between the first wire outlet hole and the second wire outlet hole is measured, the real-time coordinate of the measuring point 3 can be obtained according to the coordinate values of the first wire outlet hole and the second wire outlet hole, the lengths of the first line segment, the second line segment and the third line segment and the formula of a trigonometric function, and the coordinates of a series of measuring points 3 are connected to obtain the track of the measuring point 3. The coordinates of the first wire outlet hole and the second wire outlet hole can be manually measured in advance by taking a certain point on the horizontal plane 1 or the vertical part as an origin coordinate. In the embodiment of the present disclosure, when the two measurement points 3 are provided, two sets of the first pull sensor 71 and the second pull sensor 72 may be provided in such a manner as to ensure the accuracy of the test of the plate spring 2.
Since the shape and size of the triangle are unique in the case where three sides of the triangle are determined, the value of the measurement point coordinates can be determined, and a method of acquiring the measurement point coordinates in the case of the illustrated arrangement is exemplarily described below with reference to fig. 3, specifically, the manner of calculating the measurement point coordinates using the trigonometric function is as follows:
firstly, an included angle between the third line segment and the vertical line is obtained according to the following formula:
wherein x is1A first abscissa, x, representing a first outlet hole2A second abscissa, L, representing a second outlet hole3Indicating the length of the third line segment;
then, an included angle between the third line segment and the second line segment is obtained according to the following formula:
wherein L is1Indicates the length of the first line segment, L2Indicating the length of the second line segment;
then, an included angle between the second line segment and the vertical line is obtained according to the following formula:
β＝γ-α
finally, the coordinates of the measuring point 3 are obtained according to the following formula:
wherein x isnDenotes the abscissa, y, of the measuring point 3 at a pressure N exerted by the pressure meansnDenotes the ordinate, y, of the measuring point 3 at a pressure N exerted by the pressure means2Indicating the ordinate of the second outlet hole.
When the measuring point 3 is a point on the above-mentioned sub-frame, the coordinate of the position actually required to be measured can be calculated from the dimensional coordinate at the time of designing the sub-frame. The calculation process can be manually performed after the pressure mechanism applies pressure to the plate spring 2 each time, or the pressure mechanism and the measurement system can be all connected to an external terminal control device, and the calculation method is recorded into the control device, the control device can be connected to the hydraulic control system to obtain the pressure value applied to the plate spring 2 by the pressure mechanism in real time, the control device can calculate the real-time coordinate value of the measurement point 3 or the actually required point according to the data identified by the first stay wire sensor 71 and the second stay wire sensor 72 under the real-time pressure, and accordingly the track curve of the actually required measurement position is output according to the pressure value obtained from the hydraulic control system and the calculated coordinate value of the actually required measurement position. The method for inputting the calculation process into the control device is a common means in the field, and the disclosure does not give excessive details to the means.
According to a second aspect of the present disclosure, as shown in fig. 4, there is also provided a leaf spring testing method, as may be performed using the leaf spring testing apparatus described above, the method comprising the steps of: at step 101, mounting both ends of a plate spring 2 on a support mechanism to suspend the plate spring 2; if the plate spring 2 is mounted on the mounting seat 4 as described above, the mounting manner of the plate spring 2 on the vehicle is simulated, and the reliability of the test result is ensured.
In step 102, acquiring an initial coordinate of a preset measuring point 3; the initial coordinates may be obtained by manual measurement with a measuring tool or according to the structural design of the measuring device, and when the measuring point 3 is not the actual position to be measured, the coordinate relationship between the measuring point 3 and one or more positions to be measured may also be obtained at the same time in step 102.
At step 104, pressing the plate surface of the plate spring 2; the pressure values for pressing are preset into a plurality of groups which are sequentially increased, but the pressure values do not exceed the limit of the plate spring 2 capable of bearing pressure. The pressing may be performed in such a manner that the pressing mechanism is withdrawn after each pressing and then the next pressing is performed, or the plate spring 2 is continuously pressed with a continuously increasing pressure, and the pressing mechanism is not separated from the plate spring 2 until the pressing mechanism is withdrawn after the preset maximum pressing pressure is completed.
In step 105, the end point coordinates of the measuring point 3 are obtained, where the end point coordinates of the measuring point 3 refer to coordinate values at each pressure value corresponding to the measuring point 3 after the plate spring 2 is pressed by a preset pressure value. When the measuring point 3 is formed on the auxiliary frame fixedly connected with the plate spring 2, after the coordinates of the measuring point 3 are obtained, the terminal point coordinates of the actual required measuring position under each pressure value are calculated according to the coordinate relationship between the measuring point 3 and the actual required measuring position.
Fig. 5 is a flowchart of a plate spring testing method according to another exemplary embodiment of the present disclosure, wherein a first pull wire sensor 71 and a second pull wire sensor 72 are fixedly disposed relative to a supporting mechanism, the wire ends of the first pull wire sensor 71 and the second pull wire sensor 72 can be respectively connected to a measuring point 3, so that the first pull wire sensor 71, the second pull wire sensor 72 and the measuring point 3 form a virtual triangle, and the step of acquiring the end point coordinates of the measuring point includes:
in step 1051, the distance between the first wire-out hole of the first pull sensor 71 and the first line segment formed by connecting the first wire-out hole with the measurement point 3, the distance between the second wire-out hole of the second pull sensor 72 and the second line segment formed by connecting the second wire-out hole with the measurement point 3, and the distance between the first wire-out hole and the third line segment formed by connecting the second wire-out hole are obtained. With this structure, the manner of calculating the coordinates of the measurement point 3 has been described above, and a repeated description thereof will not be provided.
According to an embodiment of the present disclosure, as shown in fig. 1 and 2, the number of the measuring points 3 may be two, and the two measuring points 3 may be symmetrically disposed on both sides of the longitudinal center line of the plate spring 2. The two measuring points 3 can ensure the reliability of the measuring result, and in other embodiments, the measuring points 3 can be arranged symmetrically on two sides of the longitudinal center line of the plate spring 2.
Fig. 6 is a flowchart of a leaf spring testing method provided in another exemplary embodiment of the present disclosure, the method further including: after the step of acquiring the end point coordinates of the measuring point 3,
in step 106, acquiring a return coordinate of the measuring point 3 after the force is removed;
and in step 107, it is judged whether the return coordinates are the same as the initial coordinates, and if the return coordinates are different from the initial coordinates, the process returns to the step of mounting both ends of the plate spring 2 on the support mechanism to suspend the plate spring 2. When the pressure mechanism withdraws after pressing each time, the return coordinates of the measuring point 3 after withdrawing each time can be obtained, and when the pressure mechanism continuously presses, the return coordinates of the measuring point 3 after withdrawing the last pressing can be obtained. In other embodiments, after the coordinates of each set of measuring points 3 are obtained, the pressure mechanism is withdrawn, and then the plate spring 2 is pressurized again and the force is released, so as to obtain the return coordinates of the measuring points 3 at this time. The purpose of the step 106 and the step 107 is to determine whether the plate spring 2 is deformed in the testing process by comparing the return coordinate with the initial coordinate, and if the two coordinate values are different, it is proved that the plate spring 2 is deformed abnormally in the testing process, so that the plate spring 2 cannot return normally, and at this time, a new plate spring 2 needs to be rearranged or the plate spring 2 needs to be repaired and then tested again, which can effectively ensure the reliability of the plate spring testing result.
Fig. 7 is a flowchart of a leaf spring testing method provided in another exemplary embodiment of the present disclosure, the method further including: before the step of pressing the plate surface of the plate spring 2,
in step 103, the plate spring 2 is repeatedly pressed three times with the first preset pressure. The first predetermined pressure may be a full load of the leaf spring 2 when mounted on the vehicle, or may be a limit load that the leaf spring 2 can withstand when designed, typically 1.5 times the full load. Because leaf spring 2 is after the equipment is accomplished, the connection between each spare part of equipment may have the clearance, the cooperation effect between each spare part is not good, exerts pressure to leaf spring 2 three times before exerting pressure to leaf spring 2 repeatedly, can make the joint clearance obtain releasing completely, makes the cooperation more stable, stability and reliability when being favorable to follow-up test like this, increase measuring result's precision. The present disclosure does not limit the number of times the plate spring 2 is repeatedly pressed by the first preset pressure, and may be one time, five times, or the like.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A leaf spring testing apparatus, comprising:
a support mechanism for mounting both ends of the plate spring (2) to suspend the plate spring (2);
the pressure mechanism is used for pressing the plate surface of the plate spring (2); and
the measuring system is used for acquiring the coordinates of a preset measuring point (3) so as to acquire the track of the measuring point (3) in the process of pressing the plate spring (2) by the pressure mechanism, wherein the measuring point (3) is formed on the plate spring (2) or an auxiliary frame fixedly connected with the plate spring (2).
2. The leaf spring test device according to claim 1, characterized by comprising the sub-frame for fixed connection with the leaf spring (2), the sub-frame comprising a bottom plate (61) mountable on the top surface of the leaf spring (2) and a side plate (62) extending at an angle to the bottom plate (61), the measuring point (3) being formed on the side plate (62).
3. The leaf spring test arrangement according to claim 1, characterized in that the number of measuring points (3) is two, the two measuring points (3) being symmetrically arranged on both sides of the longitudinal centre line of the leaf spring (2).
4. The leaf spring testing device according to claim 1, characterized in that the support mechanism comprises two mounting seats (4) fixedly mounted on the horizontal plane (1), one of the mounting seats (4) being mounted to one end of the leaf spring (2) by means of a pin, the other mounting seat (4) being mounted to the other end of the leaf spring (2) by means of a lifting lug (5).
5. The leaf spring testing arrangement according to any of claims 1-4, characterized in that the measuring system comprises a first (71) and a second (72) pull wire sensor fixed in position relative to the support means, the wire ends of the first (71) and second (72) pull wire sensors being connectable to the measuring point (3), respectively, such that the first (71), second (72) pull wire sensors and the measuring point (3) enclose an imaginary triangle.
6. A leaf spring testing method, comprising:
mounting both ends of a plate spring (2) on a support mechanism to suspend the plate spring (2);
acquiring an initial coordinate of a preset measuring point (3);
pressing the plate surface of the plate spring (2);
-acquiring the end point coordinates of the measuring point (3),
wherein the measuring point (3) is formed on the leaf spring (2) or on an auxiliary frame fixedly connected to the leaf spring (2).
7. The plate spring testing method according to claim 6, wherein a first wire sensor (71) and a second wire sensor (72) are fixedly provided in a position opposite to the supporting mechanism, the wire ends of the first wire sensor (71) and the second wire sensor (72) are respectively connectable to the measuring point (3) so that the first wire sensor (71), the second wire sensor (72), and the measuring point (3) enclose a virtual triangle, and the step of acquiring the end point coordinates of the measuring point includes:
and acquiring the distance between a first line segment formed by connecting a first wire outlet hole of the first stay wire sensor (71) and the measuring point (3), the distance between a second line segment formed by connecting a second wire outlet hole of the second stay wire sensor (72) and the measuring point (3) and the distance between a third line segment formed by connecting the first wire outlet hole and the second wire outlet hole.
8. The leaf spring test method according to claim 6, characterized in that the number of the measuring points (3) is two, and the two measuring points (3) are symmetrically arranged on both sides of the longitudinal center line of the leaf spring (2).
9. The leaf spring testing method of claim 6, further comprising: after the step of acquiring the end point coordinates of the measuring point (3),
acquiring a return coordinate of the measuring point (3) after force is removed;
and if the return coordinates are different from the initial coordinates, returning to the step of mounting both ends of the plate spring (2) on a support mechanism to suspend the plate spring (2).
10. The leaf spring testing method according to any one of claims 6-9, further comprising: before the step of pressing the plate surface of the plate spring (2),
the plate spring (2) is repeatedly pressed three times with a first preset pressure.
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