Test device and test method for simulating fracture of plate spring

Abstract

The invention relates to a test device and a test method for simulating fracture of a plate spring, and the device comprises a single plate spring assembly which comprises a front-section plate spring and a rear-section plate spring, the front-section plate spring and the rear-section plate spring are plate spring segments formed after the middle part of the single plate spring is broken, and the front-section plate spring and the rear-section plate spring are connected with each other; the ends, close to each other, of the front-section plate spring and the rear-section plate spring are connected with mounting seats; and the plate spring suction mechanism comprises electromagnetic chucks fixed to the mounting bases respectively and a magnet located between the two electromagnetic chucks, and when the electromagnetic chucks are powered on, the electromagnetic chucks are sucked with the magnet so that the front-section plate spring and the rear-section plate spring can be converted into the combined state from the disconnected state. When the electromagnetic chuck is powered off, the electromagnetic chuck is separated from the magnet, so that the front-section plate spring and the rear-section plate spring are converted from a combined state to a disconnected state, the state of the single plate spring after fracture is simulated, the running track and posture of a vehicle after the single plate spring is fractured are tested, and safe, rapid and accurate fracture simulation test is carried out.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a test device and a test method for simulating leaf spring fracture. Background Art

[0002] At present, most commercial vehicles use leaf springs as elastic elements in their front suspension systems, and the domestic front leaf springs are mainly two-leaf and three-leaf. Therefore, designing a single-leaf front leaf spring will be one of the solutions to reduce the vehicle's deadweight. However, when the vehicle is running, the single-leaf front leaf spring will inevitably break and fail.

[0003] When the vehicle is driving normally or braking, the single-leaf steel leaf spring assembly will produce significant deformation, and the fracture of the fixed end and the ear end will seriously affect driving safety. Therefore, how to avoid fracture or reduce the safety hazards caused by the fracture of the single-leaf steel leaf spring is the direction that R&D engineers are constantly researching.

[0004] In the related technologies, the main methods used for commercial vehicle leaf spring fracture testing are: Actual destruction method: In a controlled environment, the leaf spring is artificially cut off or destroyed to simulate the fracture situation. Computer simulation method: Using computer simulation technology such as finite element analysis to simulate the leaf spring fracture situation in a virtual environment. Mechanical substitution method: Using a mechanical device to replace part of the leaf spring function, and simulating the leaf spring failure state by controlling the device.

[0005] However, the actual destruction method is costly and requires the replacement of new leaf springs for each test. It has safety risks and may be dangerous to vehicles and testers. It is difficult to accurately control the timing and location of the fracture. The test is not repeatable, which affects the consistency and comparability of the data.

[0006] Computer simulation methods cannot fully reflect the complex situations in the actual physical environment. The simulation results require a large amount of actual test data to verify, and their reliability is questionable. It is also impossible to directly observe the dynamic response of the vehicle in the actual environment.

[0007] The mechanical replacement method has the disadvantages of large structure volume and heavy weight, which affects the original performance of the vehicle. The installation is complicated and it is difficult to quickly switch between various models. The simulation lacks realism and it is difficult to accurately reflect the instantaneous state of leaf spring fracture. Summary of the invention

[0008] The embodiments of the present application provide a test device and a test method for simulating leaf spring fracture, so as to solve the problem of difficulty in accurately controlling the timing and position of fracture in the commercial vehicle leaf spring fracture test in the related art.

[0009] A first aspect of an embodiment of the present application provides a test device for simulating leaf spring fracture, comprising:

[0010] A single leaf spring assembly, the single leaf spring assembly comprising a front leaf spring and a rear leaf spring, the front leaf spring and the rear leaf spring are leaf spring segments formed by breaking the single leaf spring at the middle position, and the ends of the front leaf spring and the rear leaf spring close to each other are both connected to a mounting seat;

[0011] The leaf spring suction mechanism includes electromagnetic suction cups respectively fixed on each mounting seat, and a magnet located between the two electromagnetic suction cups. When the electromagnetic suction cups are energized, they are attracted to the magnets to convert the front leaf spring and the rear leaf spring from a disconnected state to a coupled state.

[0012] In some embodiments: a slot for connecting a front leaf spring and a rear leaf spring is provided at the bottom of the mounting seat, the rear end of the front leaf spring is fixedly connected in the slot of the mounting seat, and the front end of the rear leaf spring is fixedly connected in the slot of the mounting seat.

[0013] In some embodiments: the mounting seat is a hollow outer shell made of aluminum alloy with one end open and all sides closed, the open ends of the two mounting seats are opposite to each other, the two electromagnetic suction cups are respectively fixed in the two mounting seats, and the magnetic suction end of the electromagnetic suction cup faces the open end of the mounting seat.

[0014] In some embodiments: a receiving groove for receiving the magnet is provided at one end of the two mounting seats that are close to each other. When the two mounting seats that are close to each other are attached to each other, the receiving grooves of the two mounting seats jointly form a positioning cavity with a top opening.

[0015] In some embodiments: the positioning cavity is provided with a claw for clamping and fixing the magnet, the cross-sectional size of the positioning cavity gradually increases toward the top opening of the positioning cavity, and a permanent magnet for magnetically adsorbing the magnet is provided on the inner wall of the positioning cavity.

[0016] In some embodiments: the front end ear of the front leaf spring is connected to the frame longitudinal beam through a fixed end bracket, the rear end ear of the rear leaf spring is connected to the frame longitudinal beam through a lifting ear end bracket, and the ends of the front leaf spring and the rear leaf spring that are close to each other are both connected to the axle.

[0017] In some embodiments: a magnet adsorption mechanism is provided on the frame longitudinal beam and is located directly above the leaf spring attraction mechanism. The magnet adsorption mechanism includes a fixed bracket fixed on the lower flange plate of the frame longitudinal beam. An electromagnet for adsorbing the magnet is provided on the fixed bracket. The electromagnet and the magnet are spaced apart in the height direction.

[0018] In some embodiments: a Hall sensor for detecting magnetic magnitude is provided on one side of the electromagnetic chuck and the electromagnet, the Hall sensor is connected to a controller, and the electromagnetic chuck and the electromagnet are both electrically connected to the controller;

[0019] The controller controls the current of the electromagnetic chuck and the electromagnet according to the magnetic magnitude detected by the Hall sensor, and controls the electromagnetic chuck and the electromagnet to be powered on or off according to the breaking timing of the single leaf spring assembly.

[0020] In some embodiments: the magnet is a neodymium iron boron permanent magnet.

[0021] A second aspect of the embodiments of the present application provides a test method for simulating leaf spring fracture, the method using the test device for simulating leaf spring fracture described in any of the above embodiments, the method comprising:

[0022] The single leaf spring is cut at the middle position to form a front leaf spring and a rear leaf spring, and the ends of the front leaf spring and the rear leaf spring close to each other are connected to the mounting seat;

[0023] An electromagnetic chuck is installed on each mounting seat, and a magnet that attracts each other is installed between the two electromagnetic chucks;

[0024] The front end ear of the front leaf spring is connected to the frame longitudinal beam through the fixed end bracket, and the rear end ear of the rear leaf spring is connected to the frame longitudinal beam through the lifting ear end bracket;

[0025] The electromagnetic chuck is controlled to be energized and attracted to the magnet, so as to convert the front leaf spring and the rear leaf spring from a disconnected state to a coupled state and then be installed on the axle;

[0026] When the tested vehicle is traveling at a set speed on the test site, the electromagnetic chuck is controlled to be powered off and disengaged from the magnet, so as to convert the front leaf spring and the rear leaf spring from a coupled state to a disconnected state;

[0027] The driving trajectory of the front leaf spring and the rear leaf spring of the vehicle under test after being in a disconnected state, as well as the posture information of the vehicle under test, are obtained to evaluate the measurement results.

[0028] The beneficial effects of the technical solution provided by this application include:

[0029] The embodiment of the present application provides a test device and a test method for simulating the fracture of a leaf spring. Since the test device for simulating the fracture of a leaf spring of the present application is provided with a single leaf spring assembly, the single leaf spring assembly includes a front leaf spring and a rear leaf spring, the front leaf spring and the rear leaf spring are both leaf spring segments formed by breaking a single leaf spring at a middle position, and the ends of the front leaf spring and the rear leaf spring that are close to each other are connected to a mounting seat; a leaf spring suction mechanism, the leaf spring suction mechanism includes electromagnetic suction cups respectively fixed on each mounting seat, and a magnet located between the two electromagnetic suction cups, which are attracted to the magnets when the electromagnetic suction cups are energized to convert the front leaf spring and the rear leaf spring from a disconnected state to a coupled state.

[0030] Therefore, the test device for simulating leaf spring fracture of the present application preselects a single leaf spring to be broken at the middle position to form a front leaf spring and a rear leaf spring that are independent of each other, and a mounting seat is connected to the ends of the front leaf spring and the rear leaf spring that are close to each other. An electromagnetic suction cup is installed on each mounting seat, and a magnet is arranged between the two electromagnetic suction cups. When the electromagnetic suction cup is powered on, it is attracted by the magnet to convert the front leaf spring and the rear leaf spring from a disconnected state to a combined state, which is used to simulate the state before the single leaf spring fractures. When the electromagnetic suction cup is powered off, it is separated from the magnet to convert the front leaf spring and the rear leaf spring from a combined state to a disconnected state, which is used to simulate the state after the single leaf spring fractures, so as to test the running track and posture of the vehicle after the single leaf spring fractures.

[0031] In addition, the test device for simulating leaf spring fracture of the present application can accurately simulate the instantaneous state of fracture of a single leaf spring of a commercial vehicle. The controllability of the single leaf spring in the fracture test process and the repeatability test of the simulated commercial vehicle leaf spring fracture are achieved, so as to perform safe, fast and accurate fracture simulation tests on the single leaf spring. The single leaf spring fracture test simulation process is independently executed by the leaf spring suction mechanism to avoid actual danger to the vehicle and testers. The leaf spring suction mechanism is used to improve test efficiency, reduce the need for actual destructive testing, and reduce testing costs. It provides an innovative solution for vehicle safety testing, realizes fast and reliable fracture simulation, and meets the strict requirements of commercial vehicle safety testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A top view of the structure of a single leaf spring assembly and a leaf spring suction mechanism according to an embodiment of the present application;

[0034] Figure 2 This is a structural schematic diagram of a single leaf spring assembly and a leaf spring suction mechanism of an embodiment of the present application installed on a frame longitudinal beam and in a combined state;

[0035] Figure 3 This is a structural schematic diagram of a single leaf spring assembly and a leaf spring suction mechanism of an embodiment of the present application installed on a frame longitudinal beam and in a broken state.

[0036] Reference numerals:

[0037] 10. Single leaf spring assembly; 11. Front leaf spring; 12. Rear leaf spring; 13. Mounting seat; 20. Leaf spring suction mechanism; 21. Electromagnetic suction cup; 22. Magnet; 31. Frame longitudinal beam; 32. Fixed bracket; 33. Electromagnet. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The embodiments of the present application provide a test device and a test method for simulating leaf spring fracture, which can solve the problem of difficulty in accurately controlling the timing and position of fracture in commercial vehicle leaf spring fracture testing in related technologies.

[0040] See also Figure 1 As shown, in a first aspect of an embodiment of the present application, there is provided a test device for simulating leaf spring fracture, the test device comprising:

[0041] The single leaf spring assembly 10 includes a front leaf spring 11 and a rear leaf spring 12. The front leaf spring 11 and the rear leaf spring 12 are leaf spring segments formed by breaking the single leaf spring at the middle position. The front leaf spring 11 and the rear leaf spring 12 are at a distance of 1 / 2 to 2 / 3 of the leaf spring length from the front lifting ear at the position where the single leaf spring is broken. A mounting seat 13 is connected to the ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other. The mounting seat 13 is used to adapt and install the leaf spring suction mechanism 20.

[0042] The leaf spring suction mechanism 20 includes an electromagnetic suction cup 21 respectively fixed on each mounting seat 13, and a magnet 22 located between the two electromagnetic suction cups 21. The magnet 22 is preferably, but not limited to, a neodymium iron boron permanent magnet, and the magnetic strength of the neodymium iron boron permanent magnet is not less than N52 grade. When the electromagnetic suction cup 21 is powered on, it is attracted by the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a coupled state. When the electromagnetic suction cup 21 is powered off, it is disengaged from the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a coupled state to a disconnected state.

[0043] The test device for simulating leaf spring fracture in the embodiment of the present application preselects a single leaf spring to be broken at the middle position to form a front leaf spring 11 and a rear leaf spring 12 that are independent of each other, and a mounting seat 13 is connected to the ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other. An electromagnetic suction cup 21 is installed on each mounting seat 13, and a magnet 22 is arranged between the two electromagnetic suction cups 21. The electromagnetic suction cup 21 generates a magnetic field to attract the magnet 22 when it is energized.

[0044] When the electromagnetic chuck 21 is powered on, it is attracted to the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a coupled state, which is used to simulate the state before the single leaf spring breaks. When the electromagnetic chuck 21 is powered off, it is disengaged from the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a coupled state to a disconnected state, which is used to simulate the state after the single leaf spring breaks, so as to test the running track and posture of the vehicle after the single leaf spring breaks.

[0045] In addition, the test device for simulating leaf spring fracture in the embodiment of the present application can accurately simulate the instantaneous state of fracture of a single leaf spring of a commercial vehicle, realize the controllability of the fracture test process of the single leaf spring, and simulate the repeatability test of the fracture of the leaf spring of a commercial vehicle, so as to perform a safe, fast and accurate fracture simulation test on the single leaf spring.

[0046] The single leaf spring fracture test simulation process is independently performed by the leaf spring suction mechanism 20, avoiding actual danger to the vehicle and testers. The leaf spring suction mechanism 20 is used to improve test efficiency, reduce the need for actual destructive testing, and reduce test costs. It provides an innovative solution for vehicle safety testing, realizes fast and reliable fracture simulation, and meets the strict requirements of commercial vehicle safety testing.

[0047] In some alternative embodiments: See Figure 1 As shown, the embodiment of the application provides a test device for simulating leaf spring fracture, and the bottom of the mounting seat 13 of the test device is provided with a slot for connecting the front leaf spring 11 and the rear leaf spring 12. The rear end of the front leaf spring 11 is fixedly connected in the slot of the mounting seat 13, and the front end of the rear leaf spring 12 is fixedly connected in the slot of the mounting seat 13.

[0048] The mounting seat 13 is about 200 mm long (adjustable according to different vehicle models), and its width matches the width of the front leaf spring 11 and the rear leaf spring 12, and its thickness is 40-50 mm. The bottom of the mounting seat 13 is tightly connected to the front leaf spring 11 and the rear leaf spring 12 through a precisely machined dovetail groove structure, which facilitates the installation and removal of the front leaf spring 11 and the rear leaf spring 12 from the mounting seat 13. In addition to the dovetail groove structure used to connect the front leaf spring 11 and the rear leaf spring 12, those skilled in the art may also use bolts, welding, mortise and tenon joints and other processes to connect the mounting seat 13.

[0049] In some alternative embodiments: See Figure 1 As shown, the embodiment of the application provides a test device for simulating the fracture of a leaf spring, wherein the mounting seat 13 of the test device is a hollow outer shell made of aluminum alloy with one end open and all sides closed. The mounting seat 13 made of aluminum alloy takes into account both strength and lightness requirements. The open ends of the two mounting seats 13 are opposite to each other, and the two electromagnetic suction cups 21 are respectively fixed in the two mounting seats 13, and the magnetic suction end of the electromagnetic suction cup 21 faces the open end of the mounting seat 13.

[0050] The ends of the two mounting seats 13 that are close to each other are each provided with a receiving groove for receiving the magnet 22. When the ends of the two mounting seats 13 that are close to each other are attached to each other, the receiving grooves of the two mounting seats 13 together form a positioning cavity with an open top, which is used to receive and position the magnet 22. The inner wall of the positioning cavity is polished to reduce friction and ensure that the magnet 22 can smoothly enter or move out of the positioning cavity.

[0051] The magnetic end of the electromagnetic suction cup 21 faces the open end of the mounting seat 13, and the positioning cavity is also located at the open end of the mounting seat 13. When the two electromagnetic suction cups 21 are energized, they jointly attract the magnet 22 to form a structurally stable connection structure, and then the mutually independent front section leaf spring 11 and the rear section leaf spring 12 are quickly transformed from a broken state to a combined state, which is used for the use state when the single leaf spring is not broken.

[0052] In some alternative embodiments: See Figure 1 As shown, an embodiment of the application provides a test device for simulating the fracture of a leaf spring, wherein a clamping claw (not shown in the figure) for clamping and fixing a magnet 22 is provided in a positioning cavity of the test device, and the cross-sectional size of the positioning cavity gradually increases toward the top opening of the positioning cavity, and a permanent magnet (not shown in the figure) for magnetically attracting the magnet 22 is provided on the inner wall of the positioning cavity.

[0053] The inner wall of the positioning cavity of the embodiment of the present application is provided with a permanent magnet for magnetically attracting the magnet 22, and the permanent magnet is used to assist in fixing the magnet 22. A matching slot or protrusion is provided at the bottom of the positioning cavity to form a claw, which forms a mechanical lock with the magnet 22. The cross-sectional size of the positioning cavity gradually increases toward the top opening direction of the positioning cavity (with an inclination angle of about 1-2 degrees), and the gravity of the magnet 22 is used to quickly and accurately fall into the positioning cavity.

[0054] In some alternative embodiments: See Figures 1 to 3 As shown, the embodiment of the application provides a test device for simulating leaf spring fracture, in which the front end ear of the front leaf spring 11 of the test device is connected to the frame longitudinal beam 31 through a fixed end bracket, and the rear end ear of the rear leaf spring 12 is connected to the frame longitudinal beam 31 through a hanging ear end bracket, and the ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other are both connected to the axle (not shown in the figure).

[0055] The electromagnetic chuck 21 is controlled to be energized and attracted to the magnet 22, so as to convert the front leaf spring 11 and the rear leaf spring 12 from the disconnected state to the coupled state and then be installed on the axle. When the tested vehicle is running at a set speed on the test site, the electromagnetic chuck 21 is controlled to be de-energized and disengaged from the magnet 22, so as to convert the front leaf spring 11 and the rear leaf spring 12 from the coupled state to the disconnected state. When the front leaf spring 11 and the rear leaf spring 12 are converted to the disconnected state, the vehicle can be subjected to the running track change test and the posture change test.

[0056] In some alternative embodiments: See Figures 1 to 3 As shown, the embodiment of the application provides a test device for simulating leaf spring fracture, in which a magnetic adsorption mechanism is provided on the frame longitudinal beam 31 of the test device and is located directly above the leaf spring attraction mechanism 20. The magnetic adsorption mechanism includes a fixing bracket 32 ​​fixed on the lower flange plate of the frame longitudinal beam 31, and an electromagnet 33 for adsorbing the magnet 22 is provided on the fixing bracket 32, and the electromagnet 33 and the magnet 22 are spaced apart in the height direction.

[0057] The magnetic adsorption mechanism of the embodiment of the present application is fixed on the lower flange plate of the frame longitudinal beam 31, directly above the leaf spring attraction mechanism 20, and the center of the electromagnet 33 is aligned with the center of the positioning cavity in the vertical direction. The static spacing between the bottom surface of the electromagnet 33 and the upper surface of the magnet 22 is about 10-20mm, and the distance between the bottom surface of the electromagnet 33 and the magnet 22 can be adjusted by adjusting the length of the fixing bracket 32.

[0058] In some alternative embodiments: See Figures 1 to 3 As shown, an embodiment of the application provides a test device for simulating the fracture of a leaf spring, wherein one side of the electromagnetic suction cup 21 and the electromagnet 33 of the test device are provided with a Hall sensor (not shown in the figure) for detecting the magnetic magnitude, the Hall sensor is connected to a controller (not shown in the figure), and the electromagnetic suction cup 21 and the electromagnet 33 are both electrically connected to the controller.

[0059] The controller controls the current of the electromagnetic chuck 21 and the electromagnet 33 according to the magnetic magnitude detected by the Hall sensor, and adjusts the electromagnetic field strength by adjusting the current of the electromagnetic chuck 21 and the electromagnet 33, so that the electromagnetic chuck 21 and the electromagnet 33 meet the suction force. The controller also controls the electromagnetic chuck 21 and the electromagnet 33 to be powered on or off according to the breaking timing of the single-leaf spring assembly 10. When the electromagnetic chuck 21 is powered on, the electromagnet 33 is powered off, and when the electromagnetic chuck 21 is powered off, the electromagnet 33 is immediately powered on.

[0060] When the controller controls the electromagnetic chuck 21 to be powered on, the electromagnetic chuck 21 generates a magnetic field to attract the magnet 22, thereby converting the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a coupled state, and at this time, the electromagnet 33 is in a powered-off state. When the controller controls the electromagnetic chuck 21 to be powered-off, the magnetic field of the electromagnetic chuck 21 disappears and separates from the magnet 22, thereby converting the front leaf spring 11 and the rear leaf spring 12 from a coupled state to a disconnected state, and at this time, the electromagnet 33 is in a powered-on state to generate a magnetic field to attract the magnet 22, thereby preventing the magnet 22 from being lost after being separated from the electromagnetic chuck 21.

[0061] See also Figures 1 to 3 As shown, the second aspect of the embodiment of the present application provides a test method for simulating leaf spring fracture, the method using the test device for simulating leaf spring fracture described in any of the above embodiments, the method comprising the following steps:

[0062] S10, the single leaf spring is cut at the middle position to form a front leaf spring 11 and a rear leaf spring 12, and the ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other are connected to the mounting seat 13.

[0063] S20, installing an electromagnetic chuck 21 on each mounting seat 13, and installing a magnet 22 between two electromagnetic chucks 21 to attract each other.

[0064] S30, the front end ear of the front leaf spring 11 is connected to the frame longitudinal beam 31 through the fixed end bracket, and the rear end ear of the rear leaf spring 12 is connected to the frame longitudinal beam 31 through the hanging ear end bracket.

[0065] S40, controlling the electromagnetic chuck 21 to be energized and attracted to the magnet 22, so as to convert the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a coupled state and then install them on the axle.

[0066] S50, when the tested vehicle is running at a set speed on the test site, the electromagnetic chuck 21 is controlled to be powered off and disengaged from the magnet 22, so as to convert the front leaf spring 11 and the rear leaf spring 12 from the coupled state to the disconnected state.

[0067] S60, obtaining the driving trajectory of the front leaf spring 11 and the rear leaf spring 12 of the vehicle under test after they are in a disconnected state, as well as the posture information of the vehicle under test, and evaluating the measurement result.

[0068] How it works

[0069] The embodiment of the present application provides a test device and a test method for simulating the fracture of a leaf spring. Since the test device for simulating the fracture of a leaf spring of the present application is provided with a single leaf spring assembly 10, the single leaf spring assembly 10 includes a front leaf spring 11 and a rear leaf spring 12. The front leaf spring 11 and the rear leaf spring 12 are both leaf spring segments formed by breaking a single leaf spring at a middle position. The ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other are both connected to a mounting seat 13; a leaf spring suction mechanism 20, the leaf spring suction mechanism 20 includes an electromagnetic suction cup 21 respectively fixed on each mounting seat 13, and a magnet 22 located between the two electromagnetic suction cups 21. When the electromagnetic suction cup 21 is energized, it is attracted to the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a coupled state.

[0070] Therefore, the test device for simulating leaf spring fracture of the present application preselects a single leaf spring to be broken at the middle position to form a mutually independent front leaf spring 11 and rear leaf spring 12, and a mounting seat 13 is connected to the ends of the front leaf spring 11 and the rear leaf spring 12 that are close to each other. An electromagnetic suction cup 21 is installed on each mounting seat 13, and a magnet 22 is arranged between the two electromagnetic suction cups 21. When the electromagnetic suction cup 21 is powered on, it is attracted by the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a disconnected state to a combined state, which is used to simulate the state before the single leaf spring fractures. When the electromagnetic suction cup 21 is powered off, it is separated from the magnet 22 to convert the front leaf spring 11 and the rear leaf spring 12 from a combined state to a disconnected state, which is used to simulate the state after the single leaf spring fractures, so as to test the running track and posture of the vehicle after the single leaf spring fractures.

[0071] In addition, the test device for simulating leaf spring fracture of the present application can accurately simulate the instantaneous state of fracture of a single leaf spring of a commercial vehicle. The controllability of the single leaf spring in the fracture test process and the repeatability test of the simulated commercial vehicle leaf spring fracture are achieved, so as to perform a safe, fast and accurate fracture simulation test on the single leaf spring. The single leaf spring fracture test simulation process is independently executed by the leaf spring suction mechanism 20 to avoid actual danger to the vehicle and testers. The leaf spring suction mechanism 20 is used to improve test efficiency, reduce the need for actual destructive testing, and reduce testing costs. It provides an innovative solution for vehicle safety testing, realizes fast and reliable fracture simulation, and meets the strict requirements of commercial vehicle safety testing.

[0072] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0073] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A test device for simulating leaf spring fracture, characterized in that: include: A single leaf spring assembly (10), the single leaf spring assembly (10) comprising a front leaf spring (11) and a rear leaf spring (12), the front leaf spring (11) and the rear leaf spring (12) being leaf spring segments formed by breaking a single leaf spring at a middle position, and the ends of the front leaf spring (11) and the rear leaf spring (12) close to each other are both connected to a mounting seat (13); A leaf spring suction mechanism (20) comprises electromagnetic suction cups (21) respectively fixed on the mounting seats (13), and a magnet (22) located between the two electromagnetic suction cups (21); when the electromagnetic suction cups (21) are energized, they are attracted to the magnet (22) to convert the front leaf spring (11) and the rear leaf spring (12) from a disconnected state to a coupled state.

2. A test device for simulating leaf spring fracture according to claim 1, characterized in that: The bottom of the mounting seat (13) is provided with a slot for connecting the front leaf spring (11) and the rear leaf spring (12); the rear end of the front leaf spring (11) is fixedly connected to the slot of the mounting seat (13); and the front end of the rear leaf spring (12) is fixedly connected to the slot of the mounting seat (13).

3. A test device for simulating leaf spring fracture according to claim 1 or 2, characterized in that: The mounting seat (13) is a hollow outer shell made of aluminum alloy with one end open and surrounding parts closed. The open ends of the two mounting seats (13) are opposite to each other. The two electromagnetic suction cups (21) are respectively fixed in the two mounting seats (13), and the magnetic suction ends of the electromagnetic suction cups (21) face the open ends of the mounting seats (13).

4. A test device for simulating leaf spring fracture as claimed in claim 3, characterized in that: The ends of the two mounting seats (13) that are close to each other are each provided with a receiving groove for receiving the magnet (22); when the ends of the two mounting seats (13) that are close to each other are attached to each other, the receiving grooves of the two mounting seats (13) jointly form a positioning cavity with an opening at the top.

5. A test device for simulating leaf spring fracture as claimed in claim 4, characterized in that: The positioning cavity is provided with a clamping claw for clamping and fixing the magnet (22), the cross-sectional size of the positioning cavity gradually increases towards the top opening of the positioning cavity, and the inner wall of the positioning cavity is provided with a permanent magnet for magnetically adsorbing the magnet (22).

6. A test device for simulating leaf spring fracture according to claim 1, characterized in that: The front end ear of the front leaf spring (11) is connected to the frame longitudinal beam (31) through a fixed end bracket, and the rear end ear of the rear leaf spring (12) is connected to the frame longitudinal beam (31) through a hanging ear end bracket. The ends of the front leaf spring (11) and the rear leaf spring (12) that are close to each other are both connected to the axle.

7. A test device for simulating leaf spring fracture according to claim 6, characterized in that: The frame longitudinal beam (31) is provided with a magnetic adsorption mechanism located directly above the leaf spring attraction mechanism (20), the magnetic adsorption mechanism comprising a fixing bracket (32) fixed on a lower flange plate of the frame longitudinal beam (31), the fixing bracket (32) being provided with an electromagnet (33) for adsorbing the magnet (22), the electromagnet (33) and the magnet (22) being arranged at a distance in a height direction.

8. A test device for simulating leaf spring fracture as claimed in claim 7, characterized in that: A Hall sensor for detecting magnetic magnitude is provided on one side of the electromagnetic chuck (21) and the electromagnet (33); the Hall sensor is connected to a controller; and the electromagnetic chuck (21) and the electromagnet are both electrically connected to the controller; The controller controls the current of the electromagnetic chuck (21) and the electromagnet according to the magnetic magnitude detected by the Hall sensor, and controls the electromagnetic chuck (21) and the electromagnet (33) to be powered on or off according to the breaking timing of the single-piece leaf spring assembly (10).

9. A test device for simulating leaf spring fracture according to claim 1, characterized in that: The magnet (22) is a neodymium iron boron permanent magnet.

10. A test method for simulating leaf spring fracture, characterized in that: The method uses the test device for simulating leaf spring fracture according to any one of claims 1 to 9, and the method comprises: The single leaf spring is cut at the middle position to form a front leaf spring (11) and a rear leaf spring (12), and the ends of the front leaf spring (11) and the rear leaf spring (12) close to each other are connected to a mounting seat (13); An electromagnetic chuck (21) is installed on each mounting seat (13), and a magnet (22) that attracts each other is installed between the two electromagnetic chucks (21); The front end ear of the front leaf spring (11) is connected to the frame longitudinal beam (31) through a fixed end bracket, and the rear end ear of the rear leaf spring (12) is connected to the frame longitudinal beam (31) through a lifting ear end bracket; The electromagnetic chuck (21) is controlled to be energized and attracted to the magnet (22), so as to convert the front leaf spring (11) and the rear leaf spring (12) from a disconnected state to a coupled state and then be installed on the axle; When the tested vehicle is traveling at a set speed on a test site, the electromagnetic chuck (21) is controlled to be powered off and to be separated from the magnet (22), so as to convert the front leaf spring (11) and the rear leaf spring (12) from a coupled state to a disconnected state; The driving track of the front leaf spring (11) and the rear leaf spring (12) of the tested vehicle after being in a disconnected state and the posture information of the tested vehicle are obtained to evaluate the test results.

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