Test system and test method for confirming gunpowder amount of active front cover jacking exploder

Abstract

The invention discloses a test system and a test method for confirming the gunpowder amount of an active front cover jacking exploder, the test system comprises a rack, a front cover module and a jacking device, the front cover module is arranged on the rack through a hinge; the jacking device comprises a sleeve and a jacking rod, an opening is formed in the upper end of the sleeve, the first end of the jacking rod extends out of the opening, the second end of the jacking rod extends into the sleeve, a driving mechanism is arranged between the jacking rod and the bottom wall of the sleeve, and the second end of the jacking rod is connected to the output end of the driving mechanism; the ejector rod is located below the front cover module, and the position, facing the front cover module, of the first end of the ejector rod is consistent with the position, facing the automobile front cover, of the jacking exploder. The device has the advantages that the front cover module is jacked up through the jacking rod to simulate the movement process that the jacking exploder jacks up the automobile front cover, and the gunpowder dosage equivalent to the kinetic energy equivalent E of the jacking rod can be calculated through the kinetic energy equivalent E of the jacking rod when the jacking rod makes contact with the front cover module.

Description

Technical Field

[0001] The invention relates to the technical field of pedestrian protection, in particular to a test system and a test method for confirming the amount of gunpowder of an active front cover lifting initiator. Background Art

[0002] When the active front cover system was being developed in the early stages, there was a lack of appropriate verification methods to confirm the feasibility of the system, and it was impossible to confirm whether the amount of gunpowder in the front cover lifting detonator could meet the requirements of head-on pedestrian protection. The lifting detonator is an important part to ensure the safety of active pedestrians, and it often requires a large number of tests to confirm that the front cover reaches a certain height at a certain time to achieve the purpose of pedestrian protection. This requires a large number of front cover assemblies and a large number of gunpowder detonators to confirm the rationality of the solution and whether it can meet the C-NCAP / C-IASI pedestrian protection head score requirements. Therefore, a simple bench test method is needed to confirm whether the amount of gunpowder required for the detonator parts can meet the requirements of the front cover lock hook fixing solution. For a certain weight of the front cover, whether it can reach the predetermined height within the specified time, meet the pedestrian protection solution goals, and quickly confirm the rationality and effectiveness of the solution, and confirm the amount of gunpowder in the lifting detonator. Summary of the invention

[0003] In order to solve at least one of the above-mentioned technical problems, the present invention provides a test system and a test method for confirming the amount of gunpowder of an active front cover lifting detonator. The test system simulates the movement process of the lifting detonator lifting the front cover of a car by lifting the front cover module through a push rod, and calculates the amount of gunpowder equivalent to the kinetic energy equivalent E of the push rod through the kinetic energy equivalent E of the push rod when the push rod contacts the front cover module.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A test system for confirming the amount of gunpowder of an active front cover lifting detonator comprises a test stand, a front cover module and a lifting device, wherein the front cover module is arranged on the stand through a hinge; the lifting device comprises a sleeve and a push rod, the upper end of the sleeve has an opening, the first end of the push rod extends out of the opening, and the second end extends into the sleeve, a driving mechanism is arranged between the push rod and the bottom wall of the sleeve, and the second end of the push rod is connected to the output end of the driving mechanism; the push rod is located below the front cover module, and the position of the first end of the push rod toward the front cover module is consistent with the position of the lifting detonator toward the front cover of the car.

[0006] Furthermore, the driving mechanism comprises a cylinder, and the second end of the push rod is connected to a piston rod of the cylinder.

[0007] Furthermore, the driving mechanism includes a spring and a baffle, the spring is arranged between the push rod and the bottom wall of the sleeve; the side wall of the sleeve is provided with a socket, the push rod is provided with a limiting portion, and the baffle passes through the socket and is inserted into the limiting portion.

[0008] Furthermore, the top rod includes a rod portion and a base arranged at the bottom end of the rod portion, and the diameter of the base is larger than the diameter of the rod portion; preferably, one end of the baffle is provided with a notch adapted to the rod portion to facilitate the limiting of the baffle.

[0009] Furthermore, the side wall of the sleeve is provided with a plurality of insertion holes distributed along the extension direction of the sleeve axis, so that the compression amount of the spring can be adjusted.

[0010] Furthermore, the test system also includes a camera and a speed sensor, wherein the camera faces the front cover module, and the speed sensor is arranged on the front cover module to collect the movement process and movement speed of the front cover module.

[0011] Furthermore, the weight and center of gravity of the front cover module are consistent with the front cover of the car, saving test resources.

[0012] Furthermore, the hinges are arranged in plurality, and the number of the lifting devices is consistent with that of the hinges, so that the force state of the lift rod on the front cover module during the test is consistent with the force state of the real vehicle lifting detonator on the front cover of the car.

[0013] Furthermore, a test method for confirming the amount of gunpowder of the active front cover lifting initiator is applied to the test system described above, and the test method includes:

[0014] Step 1: Set the front cover module on the stand through the hinge;

[0015] Step 2: Start the driving mechanism, which provides driving force for the ejector rod to lift the ejector rod upward;

[0016] Step 3: Record the lifting height and lifting time of the front cover module by using a camera, and collect the initial speed of the front cover module when it is lifted by using a speed sensor;

[0017] Step 4: determine whether the lifting height and lifting time of the front cover module meet the requirements. If they meet the requirements, execute step 5; if they do not meet the requirements, increase the driving force of the driving mechanism and return to step 1.

[0018] Step 5: Calculate the amount of gunpowder according to formula 1: , formula 1;

[0019] Wherein, M is the mass of gunpowder, m is the mass of ejector rod, and v is the initial velocity when the front cover module is lifted.

[0020] Further, when the driving mechanism is configured as a cylinder, the method of increasing the driving force of the driving mechanism includes increasing the extension speed of the piston rod;

[0021] When the driving mechanism is configured as a spring and a baffle, the method of increasing the driving force of the driving mechanism includes increasing the elastic force of the spring; preferably, the method of increasing the elastic force of the spring includes: replacing the spring with a spring having a larger elastic coefficient, or increasing the compression amount of the current spring.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The test system uses a push rod to lift the front cover module to simulate the movement process of the jacking detonator lifting the front cover of the car. The kinetic energy equivalent E of the push rod when it contacts the front cover module can be used to calculate the amount of gunpowder equivalent to the kinetic energy equivalent E of the push rod. This can avoid the cost waste caused by using too much gunpowder to achieve the pedestrian protection safety goal, and can save the test resources of the detonator in the early stage of the project.

[0024] (2) By setting up front cover modules with different weight centers of gravity, different layout schemes of hinges, lifting detonators, and front cover lock hooks, as well as the amount of gunpowder for the lifting detonator, can be verified in the early stage of the project to meet the increasingly stringent safety requirements in pedestrian protection scores. At the same time, the appropriate amount of gunpowder can be determined to balance the safety score target and the economical maintenance of the front cover, saving project development time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0026] Figure 1 The present invention is a schematic diagram of the structure of a test system for confirming the amount of gunpowder in an active front cover lifting initiator.

[0027] Figure 2 It is a perspective structural schematic diagram of the jacking device of the present invention.

[0028] Figure 3 It is a schematic structural diagram of the jacking device of the present invention with the jacking rod being lifted.

[0029] Figure 4 The present invention is a flow chart of a test method for confirming the amount of gunpowder in an active front cover lifting initiator.

[0030] In the figure: 1-stand; 2-front cover module; 3-hinge; 4-lifting device; 41-sleeve; 411-opening; 412-connecting plate; 413-jack; 42-lift rod; 421-rod; 422-base; 43-spring; 44-baffle; 441-notch; 5-camera; 6-speed sensor. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0032] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] The present invention provides a test system for confirming the amount of gunpowder in an active front cover lifting initiator, referring to Figure 1-Figure 3 As shown, it includes a stand 1, a front cover module 2 and a lifting device 4, and the front cover module 2 is arranged on the stand 1 through a hinge 3. The lifting device 4 includes a sleeve 41 and a push rod 42, the upper end of the sleeve 41 has an opening 411, the first end of the push rod 42 extends out of the opening 411, and the second end extends into the sleeve 41, and a driving mechanism is arranged between the push rod 42 and the bottom wall of the sleeve 41, and the second end of the push rod 42 is connected to the output end of the driving mechanism. The push rod 42 is located below the front cover module 2, and the position of the first end of the push rod 42 toward the front cover module 2 is consistent with the position of the lifting detonator toward the front cover of the car. The sleeve 41 can be fixed to the stand 1 through a connecting plate 412 arranged on the top thereof. During the test, the driving mechanism pushes the push rod 42 upward, the shear pin of the hinge 3 breaks, and the push rod 42 moves upward with the hinge arm and the front cover module 2, so that the front cover is lifted to achieve the purpose of protecting the pedestrian's head. After the test, the driving mechanism can be reset and the test can be repeated.

[0034] Preferably, the weight and center of gravity of the front cover module 2 are consistent with the front cover of the car. By replacing the front cover of the car for testing, the front cover module 2 can be reused, saving test resources, saving costs, and avoiding waste. It is also possible to verify different layout schemes of the hinge 3, the jacking detonator, and the front cover lock hook and the amount of gunpowder of the jacking detonator in the early stage of the project by setting the front cover module 2 with different weight centers of gravity to cope with the increasingly stringent safety requirements in the pedestrian protection score, and at the same time confirm the appropriate amount of gunpowder to balance the safety score target and the maintenance economy of the front cover, saving project development time.

[0035] In one embodiment, the driving mechanism includes a cylinder, and the second end of the push rod 42 is connected to the piston rod of the cylinder. When the cylinder is started, the piston rod extends, and the push rod 42 is pushed upward, and the push rod 42 pushes the front cover upward. By driving the push rod 42 with the cylinder, the driving force of the push rod 42 can be flexibly adjusted, thereby flexibly adjusting the lifting speed and lifting time of the front cover module 2.

[0036] In one embodiment, reference Figure 2 and Figure 3 As shown, the driving mechanism includes a spring 43 and a baffle 44. The spring 43 is arranged between the top rod 42 and the bottom wall of the sleeve 41; the side wall of the sleeve 41 is provided with a socket 413, the top rod 42 is provided with a limiting portion, and the baffle 44 passes through the socket 413 and is inserted into the limiting portion. When the top rod 42 is pressed downward, the top rod 42 presses the spring 43 downward, and the spring 43 is compressed; the baffle 44 is inserted into the socket 413, and the baffle 44 is inserted into the limiting portion, so that the top rod 42 can be limited to prevent the top rod 42 from moving upward, and the spring 43 remains in a compressed state. Then the baffle 44 is pulled out, the top rod 42 is released from the limit, and the spring 43 extends upward to provide an upward driving force for the top rod 42, so that the top rod 42 is lifted upward. The top rod 42 is mechanically triggered and driven by the spring 43 and the baffle 44, and the lifting device 4 is flexible in layout, which can reduce the requirements for the test site.

[0037] Preferably, the push rod 42 includes a rod portion 421 and a base 422 disposed at the bottom end of the rod portion 421, and the diameter of the base 422 is greater than the diameter of the rod portion 421. The base 422 of the push rod 42 contacts the spring 43. When the push rod 42 is pressed downward, the push rod 42 compresses the spring 43. When the base 422 of the push rod 42 moves to the insertion hole 413, the baffle 44 is inserted into the insertion hole 413, and the upper surface of the base 422 abuts against the baffle 44, so that the baffle 44 can limit the upward movement of the base 422. The spring 43 provides an upward elastic force to the push rod 42, which can keep the position of the push rod 42 stable and the compression amount of the spring 43 stable. Preferably, one end of the baffle 44 is provided with a notch 441 adapted to the rod portion 421. When the baffle 44 is inserted into the insertion hole 413, the notch 441 of the baffle 44 abuts against the rod portion 421, so that the baffle 44 is limited and stable.

[0038] In one embodiment, the side wall of the sleeve 41 is provided with a plurality of plug holes 413 distributed along the extension direction of the axis of the sleeve 41. By limiting the position of the push rod 42 through the plug holes 413 at different heights, the spring 43 can be placed in different compression states, and the compression amount of the spring 43 can be adjusted to provide different driving forces for the push rod 42, so that the force of the push rod 42 to lift the front cover module 2 is different.

[0039] The test system also includes a camera 5 and a speed sensor 6. The camera 5 faces the front cover module 2 and is used to shoot the lifting process of the front cover module 2. The camera 5 uses a high-speed camera 5 to record the lifting height and lifting time of the front cover module 2, and then judge whether it meets the head impact score requirements of GB24550-2024 automobile pedestrian collision protection. The speed sensor 6 is set on the front cover module 2 and is used to collect the speed of the front cover module 2 during the lifting process, and can accurately collect the initial speed of the front cover module 2.

[0040] Preferably, the hinge 3 is provided in plurality, and the lifting device 4 is consistent with the number of hinges 3. Generally, a hinge 3 is provided on each side of the front hood of the car to connect the front hood of the car to the car body. Accordingly, the test system also provides two hinges 3 and lifting devices 4. The actual car lifting detonator is close to the hinge 3, and the lifting device 4 is correspondingly close to the hinge 3, so that the force state of the top rod 42 on the front hood module 2 during the test is consistent with the force state of the actual car lifting detonator on the front hood of the car, thereby improving the accuracy and reliability of the test. When the driving mechanism is a cylinder, during the test, each cylinder starts and runs at the same time, and the elongation of the piston rod of each cylinder is consistent; when the driving mechanism is a spring 43, during the test, the compression of each spring 43 is consistent, and each baffle 44 is pulled out at the same time.

[0041] The present invention also provides a test method for confirming the amount of gunpowder in the active front cover lifting initiator, which is applied to the test system described above, referring to Figure 4 As shown, the test method includes:

[0042] Step 1, setting the front cover module 2 on the stand 1 through the hinge 3;

[0043] Step 2, start the driving mechanism, the driving mechanism provides driving force for the push rod 42, and lifts the push rod 42 upward;

[0044] Step 3, recording the lifting height and lifting time of the front cover module 2 by means of the camera 5, and collecting the initial speed of the front cover module 2 when it is lifted by means of the speed sensor 6;

[0045] Step 4: determine whether the lifting height and lifting time of the front cover module 2 meet the requirements. If they do, execute step 5; if they do not, increase the driving force of the driving mechanism and return to step 1.

[0046] Step 5: Calculate the amount of gunpowder according to formula 1: , formula 1;

[0047] Wherein, M is the mass of gunpowder, m is the mass of the ejector rod 42, and v is the initial speed when the front cover module 2 is lifted up.

[0048] In step 2, when the driving mechanism is a cylinder, the cylinder is started, and the piston rod of the cylinder is extended to provide an upward driving force for the push rod 42, and the push rod 42 is lifted upward. When the driving mechanism is a spring 43, the baffle 44 is pulled out, and the spring 43 is extended upward to provide an upward driving force for the push rod 42, and the push rod 42 is lifted upward.

[0049] In step 4, if the lifting height and lifting time of the front cover module 2 meet the head impact score requirements of GB24550-2024 for automobile pedestrian collision protection, it means that the power of lifting the front cover module 2 is qualified. If it does not meet the requirements, replace the hinge 3, increase the driving force of the driving mechanism, and repeat the test until the driving force is qualified.

[0050] The initial speed v when the front cover module 2 is lifted is the initial speed when the push rod 42 contacts the front cover module 2. According to Formula 2: , the kinetic energy equivalent E of the push rod 42 when it contacts the front cover module 2 can be calculated. The explosion energy of 1g of TNT gunpowder is 2673 joules, so the amount of gunpowder M equivalent to the kinetic energy equivalent E of the push rod 42 can be calculated. .

[0051] When the driving mechanism is set as a cylinder, the method of increasing the driving force of the driving mechanism includes increasing the extension speed of the piston rod. When the driving mechanism is set as a spring 43 and a baffle 44, the method of increasing the driving force of the driving mechanism includes increasing the elastic force of the spring 43. The method of increasing the elastic force of the spring 43 includes: replacing the spring 43 with a spring 43 with a larger elastic coefficient, or increasing the compression amount of the current spring 43.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test system for confirming the amount of gunpowder in an active front cover lifting initiator, characterized in that: The invention comprises a platform, a front cover module and a lifting device, wherein the front cover module is arranged on the platform through a hinge; the lifting device comprises a sleeve and a push rod, wherein the upper end of the sleeve has an opening, the first end of the push rod extends out of the opening, and the second end extends into the sleeve, a driving mechanism is arranged between the push rod and the bottom wall of the sleeve, and the second end of the push rod is connected to the output end of the driving mechanism; The push rod is located below the front cover module, and the position of the first end of the push rod toward the front cover module is consistent with the position of the lifting detonator toward the front cover of the car.

2. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 1 is characterized in that: The driving mechanism comprises a cylinder, and the second end of the push rod is connected to the piston rod of the cylinder.

3. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 1 is characterized in that: The driving mechanism comprises a spring and a baffle, wherein the spring is arranged between the push rod and the bottom wall of the sleeve; the side wall of the sleeve is provided with an insertion hole, the push rod is provided with a limiting portion, and the baffle passes through the insertion hole and is inserted into the limiting portion.

4. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 3 is characterized in that: The top rod comprises a rod portion and a base arranged at the bottom end of the rod portion, and the diameter of the base is larger than the diameter of the rod portion; preferably, one end of the baffle is provided with a notch matched with the rod portion.

5. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 3 is characterized in that: The side wall of the sleeve is provided with a plurality of insertion holes distributed along the extension direction of the sleeve axis.

6. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 1, characterized in that: The test system further comprises a camera and a speed sensor, wherein the camera faces the front cover module and the speed sensor is arranged on the front cover module.

7. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 1, characterized in that: The weight and center of gravity of the front cover module are consistent with the front cover of the automobile.

8. The test system for confirming the amount of gunpowder in the active front cover lifting initiator according to claim 1, characterized in that: The hinges are arranged in plurality, and the number of the lifting devices is consistent with the number of the hinges.

9. A test method for confirming the amount of gunpowder in an active front cover lifting initiator, applied to the test system according to any one of claims 1 to 8, characterized in that: The test method includes: Step 1: Set the front cover module on the stand through the hinge; Step 2: Start the driving mechanism, which provides driving force for the ejector rod to lift the ejector rod upward; Step 3: Record the lifting height and lifting time of the front cover module by using a camera, and collect the initial speed of the front cover module when it is lifted by using a speed sensor; Step 4: determine whether the lifting height and lifting time of the front cover module meet the requirements. If they meet the requirements, execute step 5; if they do not meet the requirements, increase the driving force of the driving mechanism and return to step 1. Step 5: Calculate the amount of gunpowder according to formula 1: , formula 1; Wherein, M is the mass of gunpowder, m is the mass of ejector rod, and v is the initial velocity when the front cover module is lifted.

10. The test method for confirming the amount of gunpowder in an active front cover lifting initiator according to claim 9, characterized in that: When the driving mechanism is configured as a cylinder, the method of increasing the driving force of the driving mechanism includes increasing the extension speed of the piston rod; When the driving mechanism is configured as a spring and a baffle, the method of increasing the driving force of the driving mechanism includes increasing the elastic force of the spring; preferably, the method of increasing the elastic force of the spring includes: replacing the spring with a spring having a larger elastic coefficient, or increasing the compression amount of the current spring.

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