A test device and test method for simulating leaf spring fracture

Abstract

The present application relates to a test device and test method for simulating leaf spring fracture, comprising: 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 being leaf spring segments formed by breaking a single leaf spring at a middle position, the front leaf spring and the rear leaf spring being connected to a mounting seat at their respective ends close to each other; a leaf spring attraction mechanism, the leaf spring attraction mechanism comprising 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. The present application disengages from the magnets when the electromagnetic suction cups are de-energized to convert the front leaf spring and the rear leaf spring from a coupled state to a disconnected state, thereby simulating the state after a single leaf spring fracture, testing the running trajectory and posture of a vehicle after a single leaf spring fracture, and conducting a safe, fast, and accurate fracture simulation test.

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] Currently, most commercial vehicle front suspension systems use leaf springs as elastic elements. Domestically, two- and three-leaf front leaf springs are predominant. Therefore, designing a single-leaf front leaf spring is one approach to reducing vehicle weight. However, single-leaf front leaf springs are prone to breakage and failure during vehicle operation.

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

[0004] The main methods used to test commercial vehicle leaf spring fracture include: Actual destruction: This method simulates fracture by manually cutting or breaking the leaf spring in a controlled environment. Computer simulation: This method uses computer simulation techniques such as finite element analysis to simulate leaf spring fracture in a virtual environment. Mechanical substitution: This method uses a mechanical device to partially replace the leaf spring's function and control the device to simulate leaf spring failure.

[0005] However, the actual destructive method is costly, requiring the replacement of new leaf springs for each test. It also presents safety risks, potentially dangerous to both the vehicle and the tester, and is difficult to precisely control the timing and location of the break. Furthermore, the test is not repeatable, impacting 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 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 and heavy weight, which affects the original performance of the vehicle. The installation is complicated and it is difficult to quickly switch between multiple models. The simulation is not realistic enough 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 location of fracture in commercial vehicle leaf spring fracture tests in related technologies.

[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 being leaf spring segments formed by breaking a single leaf spring at a mid-section, the front and rear leaf spring ends adjacent to each other being connected to mounting seats;

[0011] The leaf spring attraction mechanism includes an electromagnetic suction cup 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 by the magnets to convert the front and rear leaf springs 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 to the slot of the mounting seat, and the front end of the rear leaf spring is fixedly connected to 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 ends of the electromagnetic suction cups face the open ends of the mounting seats.

[0014] In some embodiments: a receiving groove for accommodating 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 fitted together, 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 magnetic adsorption mechanism is provided on the frame longitudinal beam and is located directly above the leaf spring attraction mechanism. The magnetic adsorption mechanism includes a fixed bracket fixed on the lower flange plate of the frame longitudinal beam. The fixed bracket is provided with an electromagnet for adsorbing the magnet. 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 energized or deenergized according to the breaking timing of the single-piece 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 engage with the magnet 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 vehicle under test is traveling at a set speed on the test site, the electromagnetic chuck is controlled to be de-energized and disengaged from the magnet, thereby switching the front and rear leaf springs from a connected state to a disconnected state;

[0027] Obtain the driving trajectory of the vehicle under test after the front and rear leaf springs are in the disconnected state, as well as the posture information of the vehicle under test, and evaluate the measurement results.

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

[0029] An embodiment of the present application provides a test device and a test method for simulating leaf spring fracture. Since the test device for simulating leaf spring fracture 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 attraction mechanism, the leaf spring attraction mechanism includes electromagnetic suction cups respectively fixed on each mounting seat, and a magnet located between the two electromagnetic suction cups, which is attracted to the magnet when the electromagnetic suction cup is 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 in the present application preselects a single leaf spring that is broken at the middle 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 mutually adjacent ends of the front and rear leaf springs. An electromagnetic chuck is mounted on each mounting seat, and a magnet is disposed between the two electromagnetic chucks. When the electromagnetic chuck is energized, it engages with the magnet to switch the front and rear leaf springs from a disconnected state to a coupled state, thereby simulating the state before the single leaf spring fractures. When the electromagnetic chuck is de-energized, it disengages from the magnet to switch the front and rear leaf springs from a coupled state to a disconnected state, thereby simulating the state after the single leaf spring fractures, thereby testing the vehicle's trajectory and posture 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. It realizes the controllability of the single leaf spring during the fracture test process and simulates the repeatability test of the fracture of the commercial vehicle leaf spring, 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 to avoid actual danger to the vehicle and test personnel. 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0033] Figure 1 A top view of the structure of a single leaf spring assembly and a leaf spring attraction 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 attraction mechanism according to an embodiment of the present application installed on a vehicle 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 attraction mechanism in 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. Fixing bracket; 33. Electromagnet. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 location of fracture in commercial vehicle leaf spring fracture tests in related technologies.

[0040] See also Figure 1 As shown, a first aspect of an embodiment of the present application provides 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. Each of the front and rear leaf springs 11, 12 is formed by breaking a single leaf spring at its midpoint to form a leaf spring segment. The front and rear leaf springs 11, 12 are located 1 / 2 to 2 / 3 of the leaf spring length from the front lifting eye at the break point. Mounting seats 13 are connected to the adjacent ends of the front and rear leaf springs 11, 12. These mounting seats 13 are used to accommodate a leaf spring engagement mechanism 20.

[0042] The leaf spring engaging mechanism 20 includes an electromagnetic chuck 21 fixed to each mounting base 13, and a magnet 22 positioned between the two electromagnetic chucks 21. The magnet 22 is preferably, but not limited to, a NiFeB permanent magnet with a magnetic strength of no less than N52 grade. When the electromagnetic chuck 21 is energized, it engages with the magnet 22, shifting the front and rear leaf springs 11 and 12 from a disconnected state to a coupled state. When the electromagnetic chuck 21 is de-energized, it disengages from the magnet 22, shifting the front and rear leaf springs 11 and 12 from a coupled state to a disconnected state.

[0043] The test device for simulating leaf spring fracture in the present embodiment preselects a single leaf spring that is split at the center to form a front leaf spring 11 and a rear leaf spring 12. Mounting blocks 13 are attached to the adjacent ends of the front and rear leaf springs 11, 12. An electromagnetic chuck 21 is mounted on each mounting block 13, with a magnet 22 positioned between the two electromagnetic chucks 21. When the electromagnetic chucks 21 are energized, they generate a magnetic field that attracts the magnets 22.

[0044] When the electromagnetic chuck 21 is powered on, it engages with the magnet 22, shifting the front and rear leaf springs 11, 12 from a disconnected state to a connected state, simulating the state before a leaf spring breaks. When the electromagnetic chuck 21 is powered off, it disengages from the magnet 22, shifting the front and rear leaf springs 11, 12 from a connected state to a disconnected state, simulating the state after a leaf spring breaks. This allows for testing the vehicle's trajectory and posture after a leaf spring breaks.

[0045] Furthermore, the test apparatus for simulating leaf spring fracture in the embodiments of the present application can accurately simulate the instantaneous state of a commercial vehicle leaf spring fracture. This allows for controllable testing of the leaf spring during fracture testing and repeatable testing of commercial vehicle leaf spring fractures, enabling safe, rapid, and accurate fracture simulation testing of leaf springs.

[0046] The leaf spring engagement mechanism 20 independently simulates the fracture test of a single leaf spring, eliminating any actual danger to the vehicle or test personnel. This mechanism improves testing efficiency, reduces the need for actual destructive testing, and lowers testing costs. This provides an innovative solution for vehicle safety testing, enabling fast and reliable fracture simulation and meeting the stringent requirements of commercial vehicle safety testing.

[0047] In some alternative embodiments: See Figure 1 As shown, the present invention provides a test device for simulating leaf spring fracture. The bottom of the mounting base 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 to the slot of the mounting base 13, and the front end of the rear leaf spring 12 is fixedly connected to the slot of the mounting base 13.

[0048] Mounting base 13 is approximately 200 mm long (adjustable to suit different vehicle models), with a width matching the width of front and rear leaf springs 11, 12, and a thickness of 40-50 mm. The bottom of mounting base 13 securely engages with front and rear leaf springs 11, 12 via a precisely machined dovetail groove structure, facilitating installation and removal of front and rear leaf springs 11, 12 from mounting base 13. In addition to utilizing a dovetail groove structure to connect front and rear leaf springs 11, 12, mounting base 13 may also utilize bolts, welding, mortise and tenon joints, or other similar connection methods, as those skilled in the art.

[0049] In some alternative embodiments: See Figure 1 As shown, the embodiment of the application provides a test device for simulating leaf spring fracture. The mounting base 13 of the test device is a hollow outer shell made of aluminum alloy, open at one end and sealed on all sides. The mounting base 13 made of aluminum alloy balances strength and lightweight requirements. The open ends of the two mounting bases 13 face each other, and two electromagnetic suction cups 21 are respectively fixed in the two mounting bases 13, with the magnetic ends of the electromagnetic suction cups 21 facing the open ends of the mounting bases 13.

[0050] The two mounting bases 13 have a receiving slot on their proximal ends for accommodating the magnet 22. When the proximal ends of the two mounting bases 13 are in contact with each other, the receiving slots of the two mounting bases 13 jointly form a positioning cavity with an open top, which is used to accommodate 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 and exit the positioning cavity.

[0051] The magnetic end of the electromagnetic suction cup 21 faces the open end of the mounting base 13, and the positioning cavity is also located at the open end of the mounting base 13. When the two electromagnetic suction cups 21 are energized, they jointly attract the magnet 22 to form a structurally stable connection structure, thereby allowing the mutually independent front and rear leaf springs 11 and 12 to quickly transform from a broken state to a combined state, which is used for the use of a single leaf spring when it 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 a fixed magnet 22 is provided in the positioning cavity of the test device, 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 in the embodiment of the present application is provided with a permanent magnet that magnetically attracts the magnet 22 and serves to assist in securing the magnet 22. A matching slot or protrusion is provided at the bottom of the positioning cavity to form a latch that mechanically locks with the magnet 22. The cross-sectional dimensions of the positioning cavity gradually increase toward the top opening of the positioning cavity (with an inclination angle of approximately 1-2 degrees), allowing the magnet 22 to quickly and accurately fall into the positioning cavity due to its gravity.

[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 via a fixed end bracket, and the rear end ear of the rear leaf spring 12 is connected to the frame longitudinal beam 31 via 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 energized and engages with the magnet 22, switching the front and rear leaf springs 11, 12 from a disconnected state to a connected state before being installed on the axle. When the vehicle under test is traveling at a set speed on the test track, the electromagnetic chuck 21 is de-energized and disengaged from the magnet 22, switching the front and rear leaf springs 11, 12 from a connected state to a disconnected state. Once the front and rear leaf springs 11, 12 are disconnected, the vehicle can undergo trajectory change and attitude change tests.

[0056] In some alternative embodiments: See Figures 1 to 3 As shown, the present invention provides a test device for simulating leaf spring fracture. The test device includes a magnetic attraction mechanism located on a frame rail 31, directly above the leaf spring attraction mechanism 20. The magnetic attraction mechanism includes a fixing bracket 32 ​​fixed to the lower flange of the frame rail 31. An electromagnet 33 for attracting the magnet 22 is mounted on the fixing bracket 32. The electromagnet 33 is spaced apart from the magnet 22 in the height direction.

[0057] The magnetic attraction mechanism in this embodiment is fixed to the lower flange of the frame rail 31, directly above the leaf spring attraction mechanism 20. The center of the electromagnet 33 is vertically aligned with the center of the positioning cavity. The static spacing between the bottom surface of the electromagnet 33 and the top surface of the magnet 22 is approximately 10-20 mm. This distance 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 leaf spring fracture, 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, and 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 flowing through the electromagnetic chuck 21 and electromagnet 33 based on the magnetic field strength detected by the Hall effect sensor. By adjusting the current flowing through the electromagnetic chuck 21 and electromagnet 33, the electromagnetic field strength is adjusted, thereby ensuring that the electromagnetic chuck 21 and electromagnet 33 meet the required suction force. The controller also energizes and deenergizes the electromagnetic chuck 21 and electromagnet 33 based on the timing of the single-leaf spring assembly 10's breakage. When the electromagnetic chuck 21 is energized, the electromagnet 33 is deenergized. When the electromagnetic chuck 21 is deenergized, the electromagnet 33 is immediately energized.

[0060] When the controller powers on the electromagnetic chuck 21, it generates a magnetic field to attract the magnet 22, thereby causing the front and rear leaf springs 11 and 12 to transition from a disconnected state to a connected state. At this point, the electromagnet 33 is de-energized. When the controller de-energizes the electromagnetic chuck 21, the magnetic field disappears and the chuck 21 disengages from the magnet 22, causing the front and rear leaf springs 11 and 12 to transition from a connected state to a disconnected state. At this point, the electromagnet 33 remains energized, generating a magnetic field to attract the magnet 22, preventing it from being lost after detaching from the electromagnetic chuck 21.

[0061] See also Figures 1 to 3 As shown, a 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 lifting ear end bracket.

[0065] S40, controlling the electromagnetic chuck 21 to be energized and to engage with 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 traveling 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 engaged 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 the disconnected state, as well as the posture information of the vehicle under test, and evaluating the measurement results.

[0068] How it works

[0069] An embodiment of the present application provides a test device and a test method for simulating leaf spring fracture. Since the test device for simulating leaf spring fracture 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 attraction mechanism 20, the leaf spring attraction 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 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.

[0070] Therefore, the test device for simulating leaf spring fracture in the present application preselects a single leaf spring that is broken at the middle to form a mutually independent front leaf spring 11 and rear leaf spring 12. Mounting seats 13 are connected to the mutually adjacent ends of the front and rear leaf springs 11 and 12. An electromagnetic chuck 21 is mounted on each mounting seat 13, and a magnet 22 is disposed between the two electromagnetic chucks 21. When the electromagnetic chuck 21 is energized, it engages with the magnet 22 to switch the front and rear leaf springs 11 and 12 from a disconnected state to a coupled state, simulating the state before the single leaf spring fractures. When the electromagnetic chuck 21 is de-energized, it disengages from the magnet 22 to switch the front and rear leaf springs 11 and 12 from a coupled state to a disconnected state, simulating the state after the single leaf spring fractures, thereby testing the vehicle's trajectory and posture 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. It realizes the controllability of the single leaf spring during the fracture test process and simulates the repeatability test of the commercial vehicle leaf spring fracture, 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 test personnel. 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 this application, it should be noted that the terms "upper" and "lower" and the like 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 this application and simplifying the description, and do not indicate or imply 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 this 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this 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 used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any 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 comprising 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, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0074] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

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) includes electromagnetic suction cups (21) respectively fixed on each mounting seat (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 the 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 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 according to claim 3, characterized in that: The ends of the two mounting seats (13) that are close to each other are each provided with an accommodating groove for accommodating the magnet (22); when the ends of the two mounting seats (13) that are close to each other are attached to each other, the accommodating grooves of the two mounting seats (13) jointly form a positioning cavity with an open top.

5. A test device for simulating leaf spring fracture according to 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 toward the top opening of the positioning cavity, and a permanent magnet for magnetically adsorbing the magnet (22) is provided on the inner wall of the positioning cavity.

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 the 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) being spaced apart from the magnet (22) in a height direction.

8. A test device for simulating leaf spring fracture according to 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 energized or deenergized according to the breaking timing of the single-piece leaf spring assembly (10).

9. The 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 mounted on each mounting seat (13), and a magnet (22) is mounted between the two electromagnetic chucks (21) to attract each other; 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 lifting ear end bracket; The electromagnetic chuck (21) is controlled to be energized and engage with the magnet (22) 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 disengaged 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 trajectory of the front leaf spring (11) and the rear leaf spring (12) of the tested vehicle after being in a disconnected state, as well as the posture information of the tested vehicle, are obtained to evaluate the test results.

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