Vehicle debris penetration performance testing organization and testing method

Abstract

This invention discloses a vehicle debris penetration performance testing mechanism and method, including a gantry frame; an impact unit disposed on a placement platform of the gantry frame, the impact unit including a counterweight, an impact rod, a control plate, and several guide rods; the bottom of the guide rods is fixed to the control plate, and the control plate is detachably connected to the counterweight by bolts; the impact rod is disposed at the bottom of the counterweight; a limiting unit is symmetrically disposed on both sides of the guide rods, including rollers, a connecting shaft, a ratchet, a pawl, and several limiting blocks; the rollers are fixed together by the connecting shaft, the ratchet is concentrically connected to the connecting shaft, the pawl is fitted on one side of the ratchet, and a pressure switch is provided on one side of the pawl; when the impact unit rebounds, the guide rod drives the rollers to rotate until the pawl rotates, triggering the pressure switch to lock the guide rod. This avoids secondary rebound impacts interfering with accurate values ​​and ensures the reliability of test data.

Description

Technical Field

[0001] This invention relates to the field of vehicle testing technology, and in particular to a testing mechanism and method for testing vehicle debris penetration performance. Background Technology

[0002] In the field of vehicle safety testing, assessing the resistance of a vehicle frame or protective structure to high-speed debris impacts is crucial. Existing technologies, such as traditional penetration testing devices, often employ the principle of free-fall impact, simulating debris kinetic energy with counterweights. However, this method suffers from drawbacks, including rebound after impact, leading to secondary or even multiple impacts, distorting test data and failing to accurately reflect the penetration effect of a single strike. Furthermore, while locking the impact unit can be achieved by lifting it back, insufficient force fails to lock it, while excessive force fails to secure it. For counterweights of varying weights, the locking force of the mechanical braking device must be manually adjusted, a cumbersome process prone to human error leading to locking failure or excessive wear. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a testing mechanism and method for vehicle debris penetration performance.

[0004] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical solution: a vehicle debris penetration performance testing mechanism and testing method, comprising...

[0005] Gantry frame;

[0006] An impact unit is installed on the placement platform of the gantry frame. The impact unit includes a counterweight, an impact rod, a control plate, and several guide rods. The bottom of the guide rods is fixed to the control plate, and the control plate is detachably connected to the counterweight by bolts. The impact rod is located at the bottom of the counterweight.

[0007] The limiting unit is symmetrically arranged on both sides of the guide rod, including rollers, connecting shafts, ratchet, pawl and several limiting blocks; the rollers are fixed together by the connecting shaft, the ratchet is concentrically connected to the connecting shaft, the pawl is provided on one side of the ratchet, and a pressure switch is provided on one side of the pawl; when the impact unit rebounds, the guide rod drives the rollers to rotate until the pawl rotates to trigger the pressure switch to lock the guide rod.

[0008] In the above scheme, preferably, the limiting unit further includes several limiting blocks. The roller of the limiting unit is provided with a groove, and the limiting block is slidably disposed in the groove. A first electromagnet is provided in the groove, and a permanent magnet is fixed at one end of the limiting block. When the pressure switch is triggered, the first electromagnet is energized, driving the limiting block to extend out of the groove and contact and lock with the guide rod.

[0009] In the above scheme, preferably, the limiting block includes a first slider, and the groove is provided with a limiting port to limit the movement stroke of the first slider; the first slider is fixed to the permanent magnet, the permanent magnet is disposed opposite to the first electromagnet, and after the first electromagnet is energized to generate the same magnetic force as the opposite side of the permanent magnet, the permanent magnet is driven by the magnetic force to move the first slider to the outside of the groove.

[0010] In the above scheme, preferably, the pawl is slidably disposed in the sleeve via the rod body, and the sleeve is provided with an electric push rod, which is connected to the rod body and is used to control the pawl to disengage from the ratchet to release the lock.

[0011] In the above scheme, preferably, a measuring unit is provided on the placement platform. The placement platform includes a first plate, and the measuring unit is disposed in the box of the first plate. The measuring unit includes a measuring plate, a measuring spring, and a rheostat. The measuring plate is slidably disposed in the track of the box, and its bottom is connected to the bottom of the box through the measuring spring. The rheostat includes a variable resistance slider, and the bottom of the measuring plate is connected to the variable resistance slider. The rheostat is electrically connected to the first electromagnet of the limiting unit, and the resistance value changes with the displacement of the measuring plate to adjust the magnetic force of the first electromagnet.

[0012] In the above scheme, preferably, a second electromagnet is provided on the outside of the track in the box, which attracts the measuring plate to fix its position when energized.

[0013] In the above scheme, preferably, the placement platform further includes a second plate vertically arranged on both sides of the first plate, the second plate is provided with a linear bearing, and the guide rod passes through the linear bearing; a third electromagnet is provided at the bottom of the second plate for adsorbing the control plate to temporarily fix the impact unit.

[0014] In the above scheme, preferably, the roller is connected to a rotating motor, and the rotating motor drives the roller to rotate to reset the impact unit to the top of the gantry.

[0015] The test method for the vehicle debris penetration performance testing mechanism is as follows: s1: Place the vehicle frame under test in the test position below the impact bar; s2: After installing a suitable counterweight on the impact unit, the measuring plate is pressed down. The magnetic force of the first electromagnet is adjusted by the rheostat to match the weight of the counterweight, and the second electromagnet is activated to lock the rheostat slider. Furthermore, the impact unit is fixed to the top of the gantry by the adsorption control plate of the third electromagnet; s3: Disconnect the third electromagnet, and the impact unit falls freely to complete the test; s4: When the impact unit rebounds, the pawl triggers the pressure switch, and the limiting block extends the locking guide rod to prevent secondary impact; s5: Start the rotating motor to drive the roller to rotate and reset the impact unit to the top of the gantry.

[0016] The beneficial effects of this invention are as follows: By using a ratchet, a pawl, and a corresponding limiting unit, and by placing the impact unit for testing within the limiting unit, secondary rebound impacts are avoided from interfering with accurate values, ensuring the reliability of test data. Simultaneously, in conjunction with an electric push rod and a rotating motor, the rotating motor works in tandem after the pawl disengages from the roller, enabling rapid release of the locked state and automatic reset of the impact unit, thus improving testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a diagram showing the relationship between the limiting unit and the placement platform of the present invention.

[0019] Figure 3 This is a schematic diagram of the limiting unit and the impact unit of the present invention.

[0020] Figure 4 This is a top view of the limiting unit of the present invention.

[0021] Figure 5 for Figure 4 A sectional view along line AA.

[0022] Figure 6 For the present invention Figure 5 Enlarged view of point B.

[0023] Figure 7 This is a schematic diagram of the inside of the roller of the present invention.

[0024] Figure 8 This is a schematic diagram of the rotating motor and the limiting unit of the present invention. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: See also Figures 1-8 The vehicle debris penetration performance testing mechanism includes a gantry 1, on which an impact unit is provided. The impact unit can impact downward from the gantry 1 to complete the penetration test on the vehicle frame.

[0026] The impact unit includes a counterweight 3, an impact rod 4, and several guide rods 6. There are two guide rods 6, with the bottom of the guide rod 6 connected to the counterweight 3 and the tops of the guide rods 6 connected by a connecting rod.

[0027] Specifically, a control plate 5 is provided between the guide rod 6 and the counterweight. The bottom of the guide rod 6 is fixedly connected to the control plate 5. At the same time, the control plate 5 is detachably connected to the counterweight block 3. Specifically, the counterweight block 3 is provided with a through hole and is fixed to the control plate 5 by bolts. At the same time, the impact rod 4 is provided at the bottom of the through hole and is also temporarily fixed to the counterweight block 3 by screws.

[0028] The gantry frame 1 is provided with a placement platform 2. The placement platform 2 includes a first plate 18 and a second plate 19 perpendicular to both sides of the first plate 18. Several linear bearings 27 are provided on the second plate 19. The linear bearings 27 ensure that the guide rod 6 runs vertically on the gantry frame 1. At the same time, there are two linear bearings 27 on each of the second plate 19, with their opposite sides arranged on them.

[0029] A third electromagnet 28 is provided between the bottom of the third plate for temporarily adsorbing the control plate 5. After the third electromagnet 28 is energized and has magnetic force, the control plate 5, i.e. the impact unit, is temporarily fixed on the placement platform 2 of the gantry 1. Subsequently, after the third electromagnet 28 is de-energized, the impact unit falls from the gantry 1 to complete the impact test on the vehicle frame.

[0030] Since the impact unit will rebound after the impact rod 4 impacts the vehicle frame, and the rebound of the impact unit will impact the vehicle frame again, causing inaccurate test results, a limiting unit is set on the placement platform 2. The limiting unit is used to lock the rebound of the guide rod 6.

[0031] Specifically, the limiting unit includes rollers 7, connecting shafts 8, ratchet 9, and pawl 10. Two sets of limiting units are provided, located on both sides of the guide rod 6. Each limiting unit on one side includes two rollers 7 connected by a connecting shaft 8. The connecting shaft 8 is synchronously connected to the ratchet 9, meaning the ratchet 9 is concentrically connected to the connecting shaft 8. The pawl 10 is provided on one side of the ratchet 9. After the above units are set on both sides of the guide rod 6, when the guide rod 6 moves downward under the action of gravity, the rollers 7 on both sides of the guide rod 6 rotate in opposite directions. This is the first state of the rollers 7 rotating. At this time, the ratchet 9 rotates normally along with the pawl 10. That is, when the guide rod 6 moves in the opposite direction, the rollers 7 rotate in the second state. When the rollers 7 rotate in the second state, the ratchet 9 is engaged with the pawl 10.

[0032] The limiting unit also includes several limiting blocks 11 on the roller 7. The roller 7 is provided with corresponding sliding grooves 13 to match the limiting blocks 11. The limiting blocks 11 slide in the sliding grooves 13. A first electromagnet 14 for controlling the movement of the limiting blocks 11 is provided in the sliding grooves 13. When the first electromagnet 14 is energized, the limiting blocks 11 move away from the first electromagnet 14 until they abut against the guide rod 6, thereby locking the guide rod 6. That is, the guide rod 6 after rebounding will be locked by the limiting blocks 11.

[0033] To achieve the above control, a pressure switch 12 is provided on one side of the pawl 10. When the guide rod 6 moves in the opposite direction, the ratchet 9 drives the pawl 10 to rotate until the pressure switch 12 is activated. The pressure switch 12 drives the first electromagnet 14 to be energized, which moves the limiting block 11 away from the first electromagnet 14. The limiting block 11 then locks the guide rod 6.

[0034] Specifically, the limiting block 11 includes a first slider 15 for sliding. The first slider 15 slides in the groove 13 and is restricted from moving by the limiting port 16. The permanent magnet is provided on the side of the first slider 15 corresponding to the electromagnet. When the first electromagnet 14 is energized, the first slider 15 moves away from it under the action of the permanent magnet. Furthermore, the limiting block 11 can be a flexible rubber block.

[0035] Furthermore, the ratchet 9 needs to be freed from the constraint of the pawl 10. Specifically, the pawl 10 is slidably mounted in the sleeve 17 via a rod. The sleeve is fixed on the first plate 18 of the placement platform 2. At the same time, an electric push rod is provided in the sleeve 17. The electric push rod is connected to the rod and drives it to move. When the rod drives the pawl 10 to move upward, the ratchet 9 can rotate freely.

[0036] After the impact is completed, the impact unit needs to be placed back on the top of the gantry 1. Therefore, a rotating motor 29 is provided on each side of the roller 7. When the rotating motor 29 drives the roller 7 to rotate, the roller 7 after the limiting block 11 moves can rotate in the second state, moving the impact unit toward the gantry 1.

[0037] Meanwhile, in order to adapt to the different weights of the counterweight 3, i.e. the magnetic force acting on the limiting block 11, so as to prevent the guide rod from being locked by too small a magnetic force and the guide rod 6 from being unable to move by too large a magnetic force.

[0038] Therefore, a measuring unit is provided on the placement platform 2. Furthermore, a box 20 is provided on the first plate 18. The measuring unit includes a measuring plate 21 and a measuring spring 22. The measuring plate 21 is slidably disposed in the box 20. The measuring spring 22 is disposed between the bottom of the measuring plate 21 and the bottom of the box 20. The measuring position is different for impact units of different weights.

[0039] Furthermore, a variable resistor 23 is installed in the housing 20. The first electromagnet 14 and the variable resistor 23 are electrically connected. The variable resistor 23 includes a resistance coil column and a variable resistor slider 24 that slides on it. The variable resistor slider 24 is connected to the measuring plate 21, and the two move synchronously to realize the change of the variable resistor 23.

[0040] When the resistance of the variable resistor 23 connected to the first electromagnet 14 increases, the magnetic force of the first electromagnet 14 weakens. Furthermore, when the measuring plate 21 moves downward, that is, when the resistance of the first electromagnet 14 decreases, that is, when the weight of the impact unit increases, the downward movement of the measuring plate 21 is greater, and the magnetic force of the first electromagnet 14 is greater. Conversely, the magnetic force of the first electromagnet 14 decreases.

[0041] A track 25 is provided in the housing 20, and the measuring block slides in the track 25. A second electromagnet 26 is provided on the outside of the track 25. When the second electromagnet 26 is energized, the measuring block is locked on the track 25.

[0042] Furthermore, a measuring rod 30 is provided on the connecting rod at the top of the guide rod 6. The measuring rod 30 is positioned downwards, that is, the direction of the measuring rod 30 is towards the test plate. When the first electromagnet 14 and the impact unit are separated, and different counterweights 3 are reinstalled, the measuring rod 30 works in conjunction with the measuring plate 21 to achieve the evaluation of the weight of the impact unit.

[0043] Working principle:

[0044] Preparation phase: The impact unit and placement platform 2 are slidably adjusted to a suitable position and temporarily fixed to the top of the gantry frame 1. The guide rod 6 is vertically passed through the linear bearings 27 on both sides of the gantry frame 1. Next, the control plate 5 and counterweight 3 are installed. At this time, the measuring rod 30 abuts against the measuring plate 21. The measuring spring 22 is compressed according to the weight of the counterweight 3 (i.e., the impact unit), pushing the variable resistance slider 24 to move, and the magnetic force of the first electromagnet 14 is adjusted to the appropriate value. The second electromagnet 26 is then energized to lock the variable resistance slider 24 and the measuring block onto the track 25.

[0045] After energizing the third electromagnet 28, the impact unit is moved to temporarily connect the control board 5 to the third electromagnet 28. At the same time, the vehicle frame to be tested is placed under the impact unit to complete the preparation stage.

[0046] Testing phase: The third electromagnet 28 is de-energized, the control board 5 loses its magnetic attraction, and the impact unit impacts the vehicle frame under test to simulate the high-speed impact and penetration process of debris. Specifically, when the impact unit falls, the rollers 7 on both sides of the guide rod 6 move due to friction, driving the connecting shaft 8 and ratchet 9 to rotate in the first state direction; the pawl 10 slides on the tooth surface of the ratchet 9, and the pressure switch 12 is not triggered.

[0047] Rebound restriction phase: After the impact rod 4 contacts the frame, the impact unit rebounds upward due to the reaction force. The guide rod 6 drives the roller 7 to rotate in the second state, so that it rotates in the opposite direction. When the restriction unit rotates in the second state, the tooth surface of the ratchet 9 abuts against the pawl 10, forcing the pawl 10 to push the pressure switch 12 on one side of the squeeze, triggering the first electromagnet 14 to be energized. The permanent magnet in the restriction block 11 generates a repulsive force, pushing the restriction block 11 to extend outward along the slide groove 13 of the roller 7 and make close contact with the surface of the guide rod 6. The position of the guide rod 6 is locked by friction, preventing the impact unit from falling again.

[0048] Reset Phase: First, the electric push rod inside sleeve 17 is activated, pushing the pawl 10 out of the ratchet 9, thus releasing the mechanical restriction of the ratchet 9 on the pawl 10. Then, the drive motor 29 is activated, causing the roller 7 to rotate in the reverse direction of the second state, driving the guide rod 6 and impact unit to rise to the top of the gantry 1 through friction. At this time, the third electromagnet 28 is re-energized and can attract the control board 5, preparing for the next test.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle debris penetration performance testing mechanism, characterized in that: include Gantry frame (1); An impact unit is set on the placement platform (2) of the gantry (1). The impact unit includes a counterweight (3), an impact rod (4), a control plate (5), and several guide rods (6). The bottom of the guide rod (6) is fixed to the control plate (5). The control plate (5) is detachably connected to the counterweight (3) by bolts. The impact rod (4) is set at the bottom of the counterweight (3). The limiting unit is symmetrically arranged on both sides of the guide rod (6), including rollers (7), connecting shafts (8), ratchet (9), pawl (10) and several limiting blocks (11); the rollers (7) are fixed together by the connecting shafts (8), and the ratchet (9) is concentrically connected to the connecting shafts (8). The pawl (10) is provided on one side of the ratchet (9), and a pressure switch (12) is provided on one side of the pawl (10); when the impact unit rebounds, the guide rod (6) drives the rollers (7) to rotate until the pawl (10) rotates to trigger the pressure switch (12) to lock the guide rod (6); The limiting unit also includes several limiting blocks (11). The roller (7) of the limiting unit is provided with a groove (13). The limiting block (11) is slidably arranged in the groove (13). The first electromagnet (14) is provided in the groove (13). A permanent magnet is fixed at one end of the limiting block (11). When the pressure switch (12) is triggered, the first electromagnet (14) is energized, driving the limiting block (11) to extend out of the groove (13) and contact and lock with the guide rod (6). The limiting block (11) includes a first slider (15), and the slide groove (13) is provided with a limiting port (16) to limit the movement of the first slider (15); the first slider (15) is fixed to a permanent magnet, and the permanent magnet is arranged opposite to the first electromagnet (14). After the first electromagnet (14) is energized and generates the same magnetic force as the opposite side of the permanent magnet, the permanent magnet is driven by the magnetic force to move the first slider (15) to the outside of the slide groove (13); A measuring unit is provided on the placement platform (2). The placement platform (2) includes a first plate (18). The measuring unit is located in the box (20) of the first plate (18). The measuring unit includes a measuring plate (21), a measuring spring (22), and a rheostat (23). The measuring plate (21) is slidably disposed in the track (25) of the box (20). Its bottom is connected to the bottom of the box (20) through the measuring spring (22). The rheostat (23) includes a variable resistance slider (24). The bottom of the measuring plate (21) is connected to the variable resistance slider (24). The rheostat (23) is electrically connected to the first electromagnet (14) of the limiting unit. The resistance value changes with the displacement of the measuring plate (21) to adjust the magnetic force of the first electromagnet (14). The measuring unit also includes a measuring rod (30) on a connecting rod at the top of the guide rod (6). The measuring rod (30) is set downward. During the preparation stage, the impact unit and the placement platform (2) are slidably adjusted to a suitable position and temporarily fixed to the top of the gantry frame (1). The guide rod (6) is vertically passed through the linear bearings (27) on both sides of the gantry frame (1). Furthermore, the control plate (5) and the counterweight (3) are installed. At this time, the measuring rod (30) abuts against the measuring plate (21). The measuring spring (22) is compressed according to the weight of the counterweight (3), i.e. the impact unit, and the variable resistance slider (24) is pushed to move. The magnetic force of the first electromagnet (14) is adjusted to the appropriate value.

2. The vehicle debris penetration performance testing mechanism according to claim 1, characterized in that: The pawl (10) is slidably mounted in the sleeve (17) via the rod body. The sleeve (17) is equipped with an electric push rod, which is connected to the rod body and is used to control the pawl (10) to disengage from the ratchet (9) to release the lock.

3. The vehicle debris penetration performance testing mechanism according to claim 2, characterized in that: The outer side of the track (25) in the box (20) is covered with a second electromagnet (26), which attracts the measuring plate (21) to fix its position when energized.

4. The vehicle debris penetration performance testing mechanism according to claim 3, characterized in that: The placement platform (2) also includes a second plate (19) vertically arranged on both sides of the first plate (18). The second plate (19) is provided with a linear bearing (27), and the guide rod (6) passes through the linear bearing (27). The bottom of the second plate (19) is provided with a third electromagnet (28) for adsorbing the control plate (5) to temporarily fix the impact unit.

5. The vehicle debris penetration performance testing mechanism according to claim 4, characterized in that: The roller (7) is connected to a rotating motor (29), which drives the roller (7) to rotate to reset the impact unit to the top of the gantry (1).

6. The test method of the vehicle debris penetration performance testing mechanism according to claim 5, characterized in that: s1: Place the test frame under the impact bar (4) at the test position; s2: After installing the appropriate counterweight (3) on the impact unit, the measuring plate (21) is pressed down and the magnetic force of the first electromagnet (14) is adjusted by the rheostat (23) to match the weight of the counterweight (3), and the second electromagnet (26) is activated to lock the rheostat slider (24). Furthermore, the third electromagnet (28) is used to attract the control plate (5) to fix the impact unit on the top of the gantry (1); s3: Disconnect the third electromagnet (28) and the impact unit falls freely to complete the test; s4: When the impact unit rebounds, the pawl (10) triggers the pressure switch (12), and the limiting block (11) extends the locking guide rod (6) to prevent secondary impact; s5: Start the rotating motor (29) to drive the roller (7) to rotate and reset the impact unit to the top of the gantry (1).

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