Well lid bottom scraping test system

Abstract

The invention relates to the technical field of electric vehicle battery testing, in particular to a well lid bottom scraping testing system. Comprising an induction triggering mechanism used for outputting a triggering signal when it is detected that front wheels of a vehicle reach a set position; the gravity releasing mechanism is in signal connection with the induction triggering mechanism and is used for releasing a weight block which is adsorbed by magnetic force in advance and lifted to a set height after receiving the triggering signal; the well lid overturning mechanism comprises a bottom scraping well lid and a lifting rod used for driving the bottom scraping well lid to be lifted around an overturning shaft. And the connecting lever is provided with a rotating shaft, a weight falling end and a well lid lifting end, one end of the connecting lever is hinged to the weight block of the gravity releasing mechanism, and the other end of the connecting lever is coupled and linked with a lifting rod of the well lid overturning mechanism, so that the falling motion of the weight block is converted into the overturning motion of the bottom scraping well lid. According to the technical scheme, the technical problem that the manhole cover turns over to be in dynamic contact with the battery pack when a vehicle passes through the manhole cover at a high speed in the manhole cover bottom scraping test cannot be restored can be solved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery testing technology, and more specifically to a manhole cover scraping test system. Background Technology

[0002] With the rapid development of the global new energy vehicle industry, the bottom protection performance of the power battery, as a core component, has become a key indicator for ensuring the safety of the entire vehicle. Pure electric and plug-in hybrid vehicles generally adopt a low chassis design to optimize the vehicle's center of gravity distribution, integrating the battery pack into the chassis area. While this design improves vehicle handling and stability to some extent, it also brings significant safety hazards—a substantial reduction in ground clearance. In complex real-world road conditions, such as when there are bumps, depressions, or obstacles, the vehicle's bottom is highly susceptible to scraping and collisions with these objects, especially bottom scraping, which is a frequent occurrence. Manhole cover scraping is a typical form of bottom scraping accident, and in recent years, there have been numerous cases in various locations where manhole cover / brick scraping has caused vehicle fires. Once the bottom of the power battery is subjected to a scraping impact, it is highly likely to directly damage the battery pack structure, leading to thermal runaway within the battery. Once thermal runaway occurs, it can quickly trigger a chain reaction of serious safety accidents, such as battery fires or even explosions, causing not only huge economic losses to companies but also posing a serious threat to the lives and property of users. This specific operating condition places extremely stringent requirements on the verification of the bottom protection of the power battery, requiring more precise and effective testing methods to ensure the safety of the power battery under various complex road conditions.

[0003] However, current manhole cover collision simulation testing technologies have many limitations. Firstly, most tests use fixed objects to simulate collisions instead of the manhole cover. The drawback of this approach is that the fixed object cannot effectively avoid the front subframe. During testing, the front subframe may interfere with the results, failing to accurately simulate the contact between the battery pack and the manhole cover when the vehicle is scraped. Furthermore, the angle of the fixed object is constant, while in reality, a manhole cover flips when run over by a vehicle, and its contact trajectory with the vehicle's underside is dynamically changing. The fixed object's single angle cannot reproduce this dynamic contact trajectory, leading to significant discrepancies between the test results and actual conditions, and failing to accurately reflect the situation when a vehicle encounters a manhole cover scraping its underside in real-world road conditions.

[0004] On the other hand, while some hydraulically or electrically driven scraping devices can achieve the flipping and scraping action of manhole covers, these devices have significant shortcomings in terms of response and operating speed. In actual vehicle operation, especially at high speeds, the contact time between the vehicle and the manhole cover is extremely short, requiring testing equipment to respond quickly and simulate high-speed scraping conditions. However, existing hydraulically or electrically driven devices, due to limitations in their principles and structures, have slow response and operating speeds, and are only suitable for verification testing under low-speed conditions. For high-speed manhole cover scraping tests, these devices cannot meet the requirements, resulting in an inability to comprehensively and accurately evaluate the bottom protection performance of the power battery under high-speed scraping conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a manhole cover scraping test system and device. This technical solution can solve the technical problem that the above-mentioned manhole cover scraping test cannot reproduce the dynamic contact between the manhole cover and the battery pack when a vehicle passes through the manhole cover at high speed.

[0006] To achieve the above objectives, the present invention proposes a manhole cover scraping test system, comprising: The inductive triggering mechanism is used to output a trigger signal when the front wheel of the vehicle is detected to have reached a set position; A gravity release mechanism is signal-connected to the induction trigger mechanism and is used to release a heavy block that has been magnetically attracted and lifted to a set height after receiving the trigger signal. The manhole cover flipping mechanism includes a bottom-scraping manhole cover and a lifting rod for driving the bottom-scraping manhole cover to lift around a flipping axis; The connecting lever has a pivot, a weight-falling end, and a manhole cover lifting end. One end is hinged to the weight block of the gravity release mechanism, and the other end is coupled to the lifting rod of the manhole cover flipping mechanism to convert the falling motion of the weight block into the flipping motion of the scraping manhole cover.

[0007] Beneficial effects of the basic solution: This technical solution recreates the real scenario of a vehicle passing through a manhole cover at high speed, realizes a dedicated scraping test on the bottom of the battery pack, and has a rapid response and reliable structure.

[0008] The test scenario is highly realistic, using the front wheels of the vehicle as the signal source to closely match the actual logic of the manhole cover flipping before it is run over during driving. By releasing a heavy object under gravity, the dynamic flipping of the manhole cover after being impacted by the vehicle is simulated, accurately reproducing the dynamic contact process between the manhole cover and the battery pack when the vehicle is traveling at high speed, thus solving the pain point that traditional tests cannot reproduce this scenario.

[0009] This technical solution bypasses the front subframe, performing a scraping operation only on the bottom of the battery pack, focusing on the core testing area. It eliminates the obstruction or buffering effects of components such as the front subframe, allowing test results to better reflect the scratch resistance of the battery pack's bottom and improving test accuracy.

[0010] The entire scraping action can be completed in approximately 100ms, matching the time scale of a vehicle traveling at high speed. This rapid response ensures the synchronization between the manhole cover's rotation and the vehicle's movement, further enhancing the realism and effectiveness of the test.

[0011] It employs a combination of mechanical structures involving induction triggering, gravity release, and lever linkage, with a clear principle and high stability. The various mechanisms achieve coordinated action through signal connections and mechanical coupling, eliminating the need for complex electrical or hydraulic systems, thus reducing equipment complexity and maintenance costs.

[0012] The weight is pre-lifted by magnetic attraction and released by gravity upon triggering, making the action controllable and repeatable. After scraping the bottom, a lock is formed to prevent the manhole cover from accidentally falling back or flipping over again, improving the safety of the testing process.

[0013] As a feasible preferred embodiment, the position of the sensing trigger mechanism along the vehicle's driving direction is adjustable to change the scraping position; the initial height of the manhole cover flipping mechanism is adjustable to change the amount of overlap between the scraping manhole cover and the bottom of the vehicle's battery pack.

[0014] As a feasible preferred solution, the infrared transmitter and infrared receiver are positioned with a lateral spacing so that the front wheels of the vehicle pass between them and block the infrared light path. A signal processor is used to filter and delay the interrupt signal output by the infrared receiver, and output the trigger signal.

[0015] As a preferred feasible option, the inductive triggering mechanism includes a pressure switch for directly outputting the trigger signal when the front wheels of the vehicle are engaged.

[0016] As a feasible preferred embodiment, the gravity release mechanism includes: Support frame; The lifting motor, mounted on the top of the support frame, is used to lift heavy objects to a set height. An electromagnet fixing device is connected to a lifting motor; An electromagnet attracts the weight when energized and releases it when de-energized. The traction spring, with one end connected to the weight block and the other end fixed to the support frame, is used to provide additional traction force when the weight block falls. The traction spring part can be replaced with traction springs of different elastic coefficients to change the falling time.

[0017] As a feasible preferred embodiment, the lifting height of the weight block does not exceed 150mm.

[0018] As a feasible preferred embodiment, the manhole cover tipping mechanism includes: A height adjustment motor is used to adjust the initial height of the scraper cover according to the height of the bottom of the vehicle's battery pack; The flipping shaft is fixed to one side of the scraper cover; The lifting rod, driven by the connecting lever, is vertically lifted and pushes up the edge of the scraper cover, causing the scraper cover to flip upward around the flipping axis; The locking block has a groove. The locking tongue aligns with the groove of the locking block when the scraper cover is flipped into place and rises under the action of the spring to achieve mechanical locking. The blocking block is used to restrict the locking block from continuing to move, ensuring that the locking position is accurate.

[0019] As a feasible preferred embodiment, the connecting lever is a steel lever, comprising: The shaft is fixed by bearings; The raised end of the manhole cover is coupled to the manhole cover flipping mechanism; The falling end of the heavy object is coupled to the heavy block; In this process, the falling weight causes the lower end of the weight to descend, while the raised end of the manhole cover rises, thereby driving the bottom-scraping manhole cover to flip over.

[0020] As a feasible preferred solution, the lifting time of the scraping manhole cover can be adjusted by adjusting the preset delay time of the signal processor, thereby simulating the scraping conditions at different vehicle speeds.

[0021] As a feasible preferred solution, the induction triggering mechanism, gravity release mechanism, manhole cover flipping mechanism and connecting lever are all installed on the same test base and their relative positions are adjustable to accommodate vehicles with different wheelbases. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a manhole cover scraping test system disclosed in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the sensing triggering mechanism in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the gravity release mechanism in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the manhole cover flipping mechanism in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the connecting lever in an embodiment of the present invention.

[0027] Reference numerals: 100: Induction triggering mechanism; 101: Infrared transmitter; 102: Infrared receiver; 103: Signal processor; 200: Gravity release mechanism; 201: Lifting motor; 202: Electromagnet fixing device; 203: Electromagnet; 204: Weight block; 205: Traction spring; 206: Support frame; 300: Manhole cover flipping mechanism; 301: Height adjustment motor; 302: Lifting rod; 303: Flipping shaft; 304: Bottom-scraping manhole cover; 305: Locking block; 306: Locking tongue; 307: Blocking block; 308: Connecting shaft; 309: Connecting rod; 310: Lever connecting pin; 400: Connecting lever; 401: Shaft; 402: Manhole cover lifting end; 403: Weight falling end. Detailed Implementation

[0028] To make the technical solution and advantages of this application clearer, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain this application, not to limit it. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated; they can be combined with each other to achieve better technical effects. The same reference numerals appearing in the accompanying drawings of the following embodiments represent the same features or components, and can be applied to different embodiments.

[0029] Furthermore, unless otherwise defined, the technical or scientific terms used in this invention description shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] Reference Figure 1 This disclosure provides a manhole cover scraping test system, including a sensing trigger mechanism 100, a gravity release mechanism 200, a manhole cover flipping mechanism 300, and a connecting lever 400.

[0032] Reference Figure 2 The sensing triggering mechanism 100 includes an infrared transmitter 101, an infrared receiver 102, and a signal processor 103. In this embodiment, the lateral distance between the infrared transmitter 101 and the infrared receiver 102 is set to 50cm to ensure that the front wheels of the vehicle under test are between the infrared transmitter 101 and the infrared receiver 102 during the test. Simultaneously, the infrared transmitter 101 and the infrared receiver 102 must be adjustable in position along the vehicle's direction of travel to precisely control the trigger point and the scraping position.

[0033] Operating Process: When the front wheels of the vehicle pass over the induction trigger mechanism 100, they block the infrared rays emitted by the infrared transmitter 102, causing the infrared receiver signal to be interrupted. After the interruption signal is filtered and processed by the signal processor 103, it triggers the gravity release mechanism. The signal processor 103 can input a delay time in advance to delay the lifting time of the manhole cover, meeting different testing requirements. In addition, the induction trigger mechanism 100 can also use a pressure switch instead of the infrared beam device. When the front wheels of the vehicle press the pressure switch, an electrical signal is directly sent to the gravity release mechanism.

[0034] Reference Figure 3 The gravity release mechanism 200 includes a lifting motor 201, an electromagnet fixing device 202, an electromagnet 203, a weight block 204, a traction spring 205, and a support frame 206.

[0035] Specifically, such as Figure 3 As shown, the lifting motor 201 is installed at the top of the support frame 206 and connected to the electromagnet fixing device 203. Before testing, the electromagnet 203 is energized to attract the counterweight 204, and the lifting motor 201 lifts it to a set height (it is recommended not to exceed 150mm). At this time, the spring 205 is in a stretched state. The elastic coefficient of the traction spring 205 can be adjusted to change the traction force, thereby adjusting the falling time of the weight block.

[0036] Working process: When the gravity release mechanism 200 receives an electrical signal from the induction trigger mechanism 100, the electromagnet is de-energized, releasing the weight. The weight falls rapidly under its own weight and the traction force of the traction spring.

[0037] Reference Figure 4 The manhole cover flipping mechanism 300 includes a height adjustment motor 301, a lifting rod 302, a flipping shaft 303, a scraping manhole cover 304, a locking block 305, a locking tongue 306, a blocking block 307, a connecting shaft 308, a connecting rod 309, and a lever connecting pin 310. The height adjustment motor 301 can adjust the initial height of the manhole cover according to the bottom height of the vehicle battery to adapt to different vehicles and achieve a suitable scraping overlap, ensuring that the overlap between the manhole cover and the bottom of the vehicle battery pack after flipping meets the test specifications.

[0038] Working process: When the connecting lever drives the manhole cover flipping mechanism 300, the lifting rod 302 rises vertically, lifting the edge of the scraping manhole cover 304, causing it to rotate around the flipping shaft. After the scraping manhole cover 304 reaches the designated position, the locking block 305 is blocked by the blocking block. The locking block 305 is designed with a groove. When the manhole cover flips, the locking tongue 306 is pressed down by the locking block 305. When the manhole cover flips until the groove of the locking block 305 and the locking tongue 306 are in the same position, the locking tongue 306 rises under the action of the spring and locks the locking block 305, completing the mechanical locking.

[0039] Reference Figure 5The connecting lever 400 includes a pivot 401, a manhole cover lifting end 402, and a weight lowering end 403. It is located between the gravity release mechanism 200 and the manhole cover flipping mechanism 300. One end of the lever is hinged to the weight block of the gravity release mechanism, and the other end is linked to the flipping device of the manhole cover flipping mechanism. In this embodiment, the connecting lever 400 is made of special high-strength steel.

[0040] Working process: When the weight block of the gravity release mechanism 200 falls, it is transmitted to the manhole cover flipping mechanism 300 through the connecting lever 400, driving the scraping manhole cover to complete a rapid flipping action. Specifically, the falling weight block causes the weight falling end 403 of the connecting lever 400 to descend, and the manhole cover lifting end 402 to rise, linking the rotating shaft 401, connecting rod and lifting rod to realize the flipping of the manhole cover.

[0041] The specific usage method of this system includes the following steps.

[0042] Test preparation phase: Adjust the position of the induction trigger mechanism 100 to ensure that, during the test, the front wheels of the vehicle under test are positioned between the infrared transmitter 101 and the infrared receiver 102. The positions of the infrared transmitter and receiver can be freely adjusted in the vehicle's driving direction to change the position of the manhole cover scraping the bottom. Ensure that after the vehicle triggers the device, the manhole cover is in the front position of the battery pack when it is fully raised and locked.

[0043] Adjust the initial height of the 304 scraper cover to ensure that it overlaps with the bottom of the vehicle's battery pack within the required range after the cover is raised and locked.

[0044] When the electromagnet 203 is energized, the magnetic force attracts the weight block 204, which is then lifted to the designated position by the lifting motor 201. At this time, the spring 205 is in a stretched state, ready for testing.

[0045] Test execution phase: When the front wheels of the vehicle pass the induction triggering mechanism 100, the infrared beam is blocked, triggering the signal processor 103. After receiving the signal, the signal processor filters and delays the signal before transmitting it to the gravity release mechanism 200.

[0046] After receiving the signal, the gravity release mechanism 200 de-energizes the electromagnet 203, releasing the weight block 204. The weight block 204 falls rapidly under its own weight and the traction force of the traction spring 205, lowering the weight falling end 403 of the connecting lever 400 and raising the manhole cover lifting end 402. This raises the lever connecting pin 310 of the manhole cover flipping mechanism 300, and vertically lifts the linkage connecting shaft 308, connecting rod 309, and lifting rod 302, thus lifting the scraping manhole cover 304.

[0047] After the scraped manhole cover 304 reaches the designated position, the locking block 305 is blocked by the blocking block 307. The locking block is designed with a groove. When the manhole cover is flipped, the locking tongue 306 is pressed down by the locking block 307. When the manhole cover is flipped until the groove of the locking block 305 and the locking tongue 306 are in the same position, the locking tongue 306 rises under the action of the spring and locks the locking block 305, thus completing the locking. After the vehicle has completely driven out of the scraped manhole cover area, one scraped manhole cover test is completed.

[0048] The above content is merely an embodiment of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all prior art in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can improve and implement this solution based on the guidance provided in this application and their own capabilities. Some typical well-known structures or systems should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A manhole cover scraping test system, characterized in that, include: The inductive triggering mechanism is used to output a trigger signal when the front wheel of the vehicle is detected to have reached a set position; A gravity release mechanism is signal-connected to the induction trigger mechanism and is used to release a heavy block that has been magnetically attracted and lifted to a set height after receiving the trigger signal. The manhole cover flipping mechanism includes a bottom-scraping manhole cover and a lifting rod for driving the bottom-scraping manhole cover to lift around a flipping axis; The connecting lever has a pivot, a weight-falling end, and a manhole cover lifting end. One end is hinged to the weight block of the gravity release mechanism, and the other end is coupled to the lifting rod of the manhole cover flipping mechanism to convert the falling motion of the weight block into the flipping motion of the scraping manhole cover.

2. The manhole cover scraping test system according to claim 1, characterized in that, The position of the sensing trigger mechanism along the vehicle's driving direction is adjustable to change the scraping position; the initial height of the manhole cover flipping mechanism is adjustable to change the amount of overlap between the scraping manhole cover and the bottom of the vehicle's battery pack.

3. The manhole cover scraping test system according to claim 1, characterized in that, The sensing triggering mechanism includes: The infrared transmitter and infrared receiver are positioned with a lateral spacing between them, so that the front wheels of the vehicle pass between them and block the infrared light path. A signal processor is used to filter and delay the interrupt signal output by the infrared receiver, and output the trigger signal.

4. The manhole cover scraping test system according to claim 1, characterized in that, The sensing triggering mechanism includes a pressure switch for directly outputting the trigger signal when the front wheels of the vehicle are pressed together.

5. The manhole cover scraping test system according to claim 1, characterized in that, The gravity release mechanism includes: Support frame; The lifting motor, mounted on the top of the support frame, is used to lift heavy objects to a set height. An electromagnet fixing device is connected to a lifting motor; An electromagnet attracts the weight when energized and releases it when de-energized. The traction spring, with one end connected to the weight block and the other end fixed to the support frame, is used to provide additional traction force when the weight block falls. The traction spring part can be replaced with traction springs of different elastic coefficients to change the falling time.

6. The manhole cover scraping test system according to claim 1, characterized in that, The lifting height of the weight block shall not exceed 150mm.

7. The manhole cover scraping test system according to claim 1, characterized in that, The manhole cover tipping mechanism includes: A height adjustment motor is used to adjust the initial height of the scraper cover according to the height of the bottom of the vehicle's battery pack; The flipping shaft is fixed to one side of the scraper cover; The lifting rod, driven by the connecting lever, is vertically lifted and pushes up the edge of the scraper cover, causing the scraper cover to flip upward around the flipping axis; The locking block has a groove. The locking tongue aligns with the groove of the locking block when the scraper cover is flipped into place and rises under the action of the spring to achieve mechanical locking. The blocking block is used to restrict the locking block from continuing to move, ensuring that the locking position is accurate.

8. The manhole cover scraping test system according to claim 1, characterized in that, The connecting lever is a steel lever, comprising: The shaft is fixed by bearings; The raised end of the manhole cover is coupled to the manhole cover flipping mechanism; The falling end of the heavy object is coupled to the heavy block; In this process, the falling weight causes the lower end of the weight to descend, while the raised end of the manhole cover rises, thereby driving the bottom-scraping manhole cover to flip over.

9. A manhole cover scraping test system according to claim 1, characterized in that, By adjusting the preset delay time of the signal processor, the lifting time of the scraping manhole cover can be adjusted to simulate scraping conditions at different vehicle speeds.

10. A manhole cover scraping test system according to claim 1, characterized in that, The induction triggering mechanism, gravity release mechanism, manhole cover flipping mechanism, and connecting lever are all installed on the same test base, and their relative positions are adjustable to accommodate vehicles with different wheelbases.

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