A secondary impact prevention device for impact test and a control method thereof

Abstract

This invention relates to the field of automotive safety testing and impact testing technology, and particularly to an impact testing device and control method for preventing secondary impacts. The device includes: a frame; an impact mechanism comprising an impact swing arm rotatably connected to the frame, and a counterweight at the free end of the impact swing arm; a positioning and suppression mechanism including a suppression component and a locking component on the impact swing arm; when the impact swing arm swings back to a preset locking position, the suppression component and the locking component cooperate to lock the impact swing arm; a lifting drive mechanism including a lifting swing arm, a locking component, and a lifting component; a locking component is provided on the counterweight; when the locking component and the locking component are engaged, the lifting component pulls the lifting swing arm and the impact swing arm away from the test position; when the locking component and the locking component are unlocked, the impact swing arm swings towards the test position. This invention uses a positioning and suppression mechanism to lock the impact swing arm, suppressing secondary impacts generated by the swing arm's return, thus improving test reliability.

Description

Technical Field

[0001] This invention relates to the field of automotive safety testing and impact testing technology, and in particular to an impact testing device and control method for preventing secondary impacts. Background Technology

[0002] Impact testing is a crucial technique in automotive safety testing for evaluating the impact resistance of vehicle structural components and parts. It is widely used in performance testing of bumpers, body structures, battery packs, frames, and other safety components. Existing impact testing equipment typically applies a predetermined impact load to the test object using a swing arm, drop hammer, or other impact mechanism, and collects parameters such as force, displacement, acceleration, and deformation during the impact process to assess the dynamic impact performance and safety reliability of the test object.

[0003] However, in existing impact testing equipment, after the initial impact, the impactor is prone to rebound due to residual kinetic energy and inertia. When the rebound amplitude is large, the impactor may come into contact with the test object again, resulting in secondary or even multiple impacts. The additional energy generated by the secondary impact can interfere with the test data, reduce the accuracy and repeatability of the test results, and thus affect the reliability of the impact performance evaluation of the test object. Summary of the Invention

[0004] This invention provides a device and control method for preventing secondary impact during impact testing, which can effectively solve the problems in the background art.

[0005] The technical solution provided by this invention is as follows: A device for preventing secondary impact during impact testing, comprising: frame; The impact mechanism includes an impact swing arm rotatably connected to the frame, and a counterweight disposed at the free end of the impact swing arm; The positioning and suppression mechanism includes a suppression component disposed on the frame and a locking component disposed on the impact swing arm. When the impact swing arm swings back to a preset locking position, the suppression component and the locking component cooperate to lock the impact swing arm. The lifting drive mechanism includes a lifting swing arm rotatably connected to the frame, a locking component disposed on the lifting swing arm, and a lifting component; the lifting component is connected to the lifting swing arm and provides rotational power to the lifting swing arm. The counterweight is equipped with a locking component, and the locking assembly can cooperate with the locking component to lock or unlock, so as to realize the linkage or separation between the impact swing arm and the lifting swing arm.

[0006] Furthermore, the suppression component includes two friction heads respectively disposed on both sides of the impact swing arm, and the two friction heads are respectively fixedly installed at corresponding positions on the frame; When the impact swing arm swings to the preset locking position, the two friction heads move closer to each other and clamp together to lock the locking member.

[0007] Furthermore, the locking element includes: Two friction plates are disposed on both sides of the impact swing arm and are slidably connected to the impact swing arm. Two connecting pieces are fixedly connected to the corresponding ends of the two friction plates respectively. Two elastic elements are respectively provided in the annular structure surrounded by the two friction plates and the two connecting pieces. The two elastic elements are respectively provided between the impact swing arm and the two connecting pieces.

[0008] Furthermore, each of the two connecting pieces is provided with a pressure sensing structure for sensing the compressive force from the corresponding elastic element.

[0009] Furthermore, the locking member protrudes from the surface of the counterweight, and the locking assembly includes a locking box with an open end facing the locking member. The locking member extends into the locking box through the open end, and the locking assembly locks the locking member.

[0010] Furthermore, the locking member has a locking hole, and the locking assembly has a locking post that can be relatively close to or away from the inside of the locking hole.

[0011] Furthermore, the locking member has a locking groove, and a locking roller is rotatably connected in the locking groove. The locking assembly has a locking pin that can move relatively close to or away from the inside of the locking groove. During the process of the locking pin moving in and out of the locking groove, it makes rolling contact with the locking roller.

[0012] Furthermore, it also has a height adjustment mechanism, including two lead screws rotatably connected to the frame, a crossbeam sleeved on the two lead screws by nuts, and a drive member that drives the lead screws to rotate so that the crossbeam can move relatively closer or further away from the ground. Both the impact swing arm and the lifting swing arm are rotatably connected to the crossbeam.

[0013] A method for controlling secondary impact during impact testing, using the impact testing device for preventing secondary impact as described above, includes the following steps: The locking component engages with the locking member disposed on the counterweight to lock the lifting swing arm and the impact swing arm into a linked state. The lifting component pulls the lifting arm, causing the lifting arm to lift the impact arm to a preset impact height. Release the locking state between the locking component and the locking member, so that the impact swing arm swings toward the object under the action of gravity to complete the first impact; After the initial impact, the impact arm produces a return swing motion; When the impact swing arm swings to the preset locking position, the suppression component on the frame cooperates with the locking component on the impact swing arm to lock the impact swing arm and restrict the impact swing arm from continuing to swing.

[0014] Furthermore, when the impact arm swings back to a position perpendicular to the ground, a locking operation is performed.

[0015] The beneficial effects of this invention are as follows: This invention uses a lifting drive mechanism to rotate and raise the impact swing arm and lifting swing arm to a preset impact height. Locking and releasing of the impact swing arm and lifting swing arm are achieved through the cooperation of a locking component and a locking element. When the impact swing arm swings back to the preset locking position after completing the first impact, the suppression component and locking element in the positioning suppression mechanism cooperate to lock the impact swing arm, restricting it from continuing to swing back. This prevents the impact swing arm from swinging back towards the test position and causing a secondary impact. This solves the technical problem in existing impact testing equipment where the rebound of the impact body easily causes secondary impacts, affecting the accuracy and repeatability of test data. It improves the stability of the impact testing process and the reliability of the test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the impact test anti-secondary impact device in an embodiment of the present invention; Figure 2 This is a front view of the impact test anti-secondary impact device in an embodiment of the present invention; Figure 3 This is a side view of the impact test anti-secondary impact device in an embodiment of the present invention; Figure 4 This is a schematic diagram of the positioning and suppression mechanism in the impact test anti-secondary impact device in an embodiment of the present invention; Figure 5 This is a schematic diagram of the positioning and suppression mechanism in the impact test anti-secondary impact device in an embodiment of the present invention from another perspective; Figure 6This is a schematic diagram of the lifting drive mechanism in the impact test anti-secondary impact device in an embodiment of the present invention; Figure 7 This is a schematic diagram of the lifting drive mechanism in the impact test anti-secondary impact device in an embodiment of the present invention from another perspective; Figure 8 This is a schematic diagram of the locking component in the impact test anti-secondary impact device in an embodiment of the present invention; Figure 9 This is a cross-sectional view of the locking assembly and locking element in the impact test anti-secondary impact device in an embodiment of the present invention; Figure 10 This is a cross-sectional view of the locking assembly and locking element in the impact test anti-secondary impact device in an embodiment of the present invention. Figure 11 This is a schematic diagram of the height adjustment mechanism in the impact test anti-secondary impact device in an embodiment of the present invention.

[0018] Reference numerals: 1. Frame; 2. Impact mechanism; 21. Impact swing arm; 22. Counterweight; 22a. Locking component; 22a1. Locking hole; 22a2. Locking groove; 22a3. Locking roller; 3. Positioning suppression mechanism; 31. Suppression assembly; 31a. Friction head; 32. Locking component; 32a. Friction plate; 32b. Connecting plate; 32c. Elastic component installation position; 4. Lifting drive mechanism; 41. Lifting swing arm; 42. Locking assembly; 42a. Locking box; 42b. Locking post; 42c. Locking pin; 5. Height adjustment mechanism; 51. Lead screw; 52. Crossbeam; 53. Drive component. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Example 1 like Figures 1 to 11 The impact test protection device shown includes: Rack 1; Impact mechanism 2, such as Figure 2 , Figure 3 As shown, it includes an impact swing arm 21 rotatably connected to the frame 1, and a counterweight 22 disposed at the free end of the impact swing arm 21. Positioning suppression mechanism 3, such as Figure 2 As shown, it includes a suppression component 31 mounted on the frame 1 and a locking component 32 mounted on the impact swing arm 21. When the impact swing arm 21 swings back to the preset locking position, the suppression component 31 and the locking component 32 cooperate to lock the impact swing arm 21. Enhance drive mechanism 4, such as Figure 2 As shown, it includes a lifting arm 41 rotatably connected to the frame 1, a locking assembly 42 disposed on the lifting arm 41, and a lifting assembly; the lifting assembly is connected to the lifting arm 41 and provides rotational power to the lifting arm 41. The counterweight 22 is provided with a locking element 22a. The locking component 42 can cooperate with the locking element 22a to lock or unlock, so as to realize the linkage or separation between the impact swing arm 21 and the lifting swing arm 41.

[0023] In the non-operating state, the locking assembly 42 and the locking element 22a are locked, forming a linkage structure between the lifting swing arm 41 and the impact swing arm 21. The lifting assembly drives the impact swing arm 21 to rotate and lift it synchronously to a preset height via the lifting swing arm 41. This synchronous rotation and lifting is based on the fact that the rotation axes of the impact swing arm 21 and the lifting swing arm 41 on the frame 1 are on the same extension line. When the impact swing arm 21 rotates and lifts to the preset impact height, the locking assembly 42 is controlled to release the locking element 22a. The impact swing arm 21 disengages from the lifting swing arm 41 and swings towards the test position under the action of gravity to perform an impact test on the object under test.

[0024] After the impact arm 21 completes its first impact, it swings back under the reaction force and inertia of the impacted object. When the impact arm 21 swings back to the preset locking position, the suppression component 31 on the frame 1 cooperates with the locking component 32 on the impact arm 21 to lock the impact arm 21, thereby limiting the impact arm 21 from continuing to swing back and stopping the impact arm 21 at the preset locking position. This solves the technical problem in existing impact testing equipment where the impact arm 21 easily impacts the test object again during swinging back, resulting in a secondary impact, and improves the stability of the impact test process and the accuracy of the test results. It should be noted that the lifting component can be a hoisting mechanism, a hydraulic drive mechanism, an electric push rod drive mechanism, or other drive structures capable of driving the lifting arm 41 to rotate and lift, all of which should fall within the protection scope of this invention and can be specifically installed on the frame 1.

[0025] As a preferred embodiment of this example, Figure 5 As shown, the suppression component 31 includes two friction heads 31a respectively disposed on both sides of the impact swing arm 21. The two friction heads 31a are fixedly installed at corresponding positions on the frame 1 and are symmetrically arranged with respect to the swing trajectory of the impact swing arm 21. When the impact swing arm 21 swings to the preset locking position, the two friction heads 31a move closer to each other and clamp to lock the locking member 32. It should be noted that the clamping force provided by the two friction heads 31a can be driven by hydraulic drive, pneumatic drive, or electric motor drive, and the reset after clamping can also rely on the above power.

[0026] As a preferred embodiment, see Figure 4 and Figure 5 The locking element 32 includes two friction plates 32a disposed on both sides of the impact swing arm 21 and slidably connected to the impact swing arm 21, and two connecting plates 32b respectively fixedly connected to the corresponding ends of the two friction plates 32a. Two elastic elements are respectively disposed within the annular structure enclosed by the two friction plates 32a and the two connecting plates 32b, and are respectively disposed between the impact swing arm 21 and the two connecting plates 32b. Figure 5 The elastic element is installed at position 32c as shown; the elastic element provides motion buffering as the friction plate 32a is pressed and locked by the friction head 31a, and the impact swing arm 21 continues to move relative to the connecting plate 32b.

[0027] In this preferred embodiment, the aim is to address the impact problem caused to the device at the instant when the impact swing arm 21 is locked and its speed change is zero. The annular structure stops moving as a whole based on the compression and locking of the friction plate 32a by the friction head 31a. However, due to the setting of the elastic element, the impact swing arm 21 can continue to move a set distance, and the movement is buffered by the elastic deformation of the elastic element. It should be noted that the elastic element can be a spring or elastic rubber, etc., and the specific structure can be selected according to the magnitude of the impact force. In addition, the sliding connection position between the friction plate 32a and the impact swing arm 21 can be guided by a sliding groove, and a sliding block structure is set corresponding to the sliding groove. The sliding groove can be set on the impact swing arm 21 or on the friction plate 32a, both of which can realize the function of relative sliding. Since the movement mode of the impact swing arm 21 is rotation, the sliding groove needs to be set as an arc, and the axis of the arc is the rotation axis of the impact swing arm 21.

[0028] As a preferred embodiment, pressure sensing structures are respectively provided on the two connecting pieces 32b to sense the extrusion force from the elastic element; in specific implementation, when the extrusion force is greater than a set threshold, the friction head 31a can be controlled to release the extrusion lock on the friction piece 32a; the pressure sensing structure can specifically adopt a pressure sensing piece.

[0029] When the impact swing arm 21 swings without impacting the object being measured, due to factors such as friction at the shaft connection, the impact swing arm 21 will not repeatedly swing to the same height, and the swing height will gradually decrease. However, in actual operation, because the object being measured exerts a reaction force on the impact swing arm 21, the impact swing arm 21 may reach the height required to impact the object again. In the above embodiment, by setting a pressure sensing structure and controlling the friction head 31a to release the pressure lock on the friction plate 32a when the extrusion pressure is greater than a set threshold, the aim is to release the motion constraint on the impact swing arm 21 before its speed drops to zero, which can further reduce the impact on the device caused by the sudden change in the speed of the impact swing arm 21 and the sudden stop of the counterweight 22. At the same time, because the impact swing arm 21 is hindered during its movement, it cannot reach the impact position of the object being measured even if it continues to swing.

[0030] Specifically, when the impact swing arm 21 swings back, a motion resistance is applied once, and when it moves towards the object being measured again after the swing, a motion resistance is applied again, thereby effectively reducing its kinetic energy. In the above embodiment, the buffer length can be adjusted by controlling the size of the annular structure, and the required elastic buffering capacity can be obtained by appropriately selecting the elastic element. Of course, during implementation, if the swing speed of the impact swing arm 21 has dropped to the set range, it can be directly locked and fixed.

[0031] Example 2 The overall structure of the impact test anti-secondary impact device in this embodiment is the same as that in Embodiment 1, and will not be repeated here; the difference is that, based on the above overall structure, the structure of the locking component 42 and the locking element 22a is optimized in this embodiment, as follows: like Figure 6 and Figure 8 As shown, the locking member 22a protrudes from the surface of the counterweight 22, so that the locking member 22a can form a clear exposed structure during the lifting process, which facilitates the positioning and engagement with the locking assembly 42. The locking assembly 42 includes a locking box 42a with an open end facing the locking member 22a. The open end of the locking box 42a forms a receiving space for accommodating the locking member 22a. The locking member 22a extends into the locking box 42a, and the locking assembly 42 locks the locking member 22a, ensuring the stability of the impact swing arm 21 during the rotation lifting process.

[0032] The locking member 22a and the locking box 42a form an insertion-type locking structure, which, compared with the traditional external clamping locking method, has the advantages of high locking reliability and compact structure, and can effectively improve the control stability of the drive mechanism 4 on the impact swing arm 21. The open end of the locking box 42a can be circular, rectangular or elongated, and the cross-sectional shape of the locking member 22a can match it; as an optional embodiment, a guide chamfer is provided at the open end to improve the insertion alignment accuracy, but this example does not constitute a limitation on the scope of protection of the present invention.

[0033] To improve the stability of the locking connection and prevent the locking element 22a from accidentally disengaging due to vibration or swaying during rotation and lifting, the reliability of the lifting and releasing process of the impact swing arm 21 is improved. Figures 8 to 10 As shown, the locking member 22a has a locking hole 22a1, and the locking assembly 42 has a locking post 42b that can move relatively close to or away from the inside of the locking hole 22a1. When the impact swing arm 21 and the lifting swing arm 41 are in a linked state, the locking member 22a extends into the locking box 42a. When the locking member 22a moves to the preset locking position, the locking post 42b moves toward the locking hole 22a1 and inserts into the locking hole 22a1, so that the locking member 22a and the locking assembly 42 form a limiting connection. When it is necessary to release the impact swing arm 21, the locking post 42b moves away from the locking hole 22a1 and exits the locking hole 22a1, so that the locking member 22a is unlocked, the impact swing arm 21 and the lifting swing arm 41 are disengaged, so that the impact swing arm 21 can swing toward the test position under the action of gravity.

[0034] The cross-sectional shape of the locking post 42b can be adapted to the structure of the locking hole 22a1. As an optional implementation, the locking post 42b can be cylindrical, square, or conical. The locking hole 22a1 can be set as a round hole, square hole, or conical hole accordingly. As long as the structure can achieve the locking post 42b being inserted into the locking hole 22a1 to form a locking connection, it should be considered as an alternative implementation of the present invention. This example does not constitute a limitation on the scope of protection of the present invention.

[0035] like Figures 7 to 9 As shown, the locking member 22a also has a locking groove 22a2, and a locking roller shaft 22a3 is rotatably connected in the locking groove 22a2. The locking assembly 42 has a locking pin 42c that can be relatively close to or away from the inside of the locking groove 22a2. During the process of the locking pin 42c moving in and out of the locking groove 22a2, it rolls in contact with the locking roller shaft 22a3.

[0036] like Figure 9 As shown, when the impact swing arm 21 and the lifting swing arm 41 are in a linked state, the locking member 22a extends into the locking box 42a. When the locking member 22a moves to the preset locking position, the locking pin 42c faces the inside of the locking groove 22a2 and fits against the outer periphery of the locking roller shaft 22a3, so that the locking member 22a and the locking assembly 42 form a locked connection. When it is necessary to release the impact swing arm 21, the locking pin 42c moves away from the locking groove 22a2 and disengages from the locking roller shaft 22a3, so that the locking member 22a is released from the locked state, and the impact swing arm 21 and the lifting swing arm 41 are de-linked, so that the impact swing arm 21 can swing towards the test position under the action of gravity. Since the locking roller shaft 22a3 can roll relative to the locking pin 42c during the locking and releasing process, the sliding friction between the locking pin 42c and the locking roller shaft 22a3 can be reduced, the action resistance and component wear can be reduced, and the locking reliability and service life of the locking assembly 42 can be improved.

[0037] It should be noted that, based on the purpose of locking the impact swing arm 21 and the lifting swing arm 41, the engagement of the locking hole 22a1 and the locking pin 42b, as well as the engagement of the locking groove 22a2 and the locking pin 42c, can both be achieved. However, given the different forms of the two engagements, the following optimized usage method can be adopted: The locking pin 42b is horizontally positioned, and correspondingly, the locking hole 22a1 extends horizontally. The locking pin 42c is vertically positioned relative to the locking pin 42b, and correspondingly, the axis of the locking roller 22a3 is horizontally positioned. Given this distribution, the locking pin 42b and locking pin 42c can remain in an inserted and locked state while the impact arm 21 and lifting arm 41 are in linkage. During the process from the locked state to the release of the lifting arm 41, the locking pin 42b is first moved out of the locking hole 22a1. Since the locking pin 42c remains locked during this process, the locking pin 42b and its corresponding power source are protected. Then, the locking pin 42c is moved out of the locking groove 22a2. During this process, the rolling of the locking roller 22a3 reduces friction on the locking pin 42c, thus protecting it and its corresponding power source. It should be noted that the power driving the locking pin 42b or locking pin 42c can be a conventional linear power source such as a pneumatic cylinder, hydraulic cylinder, or electric cylinder.

[0038] To improve the adaptability and testing efficiency of the device under different testing conditions, such as Figure 11 As shown, the device also includes a height adjustment mechanism 5, comprising two lead screws 51 rotatably connected to the frame 1, a crossbeam 52 fitted onto the two lead screws 51 by nuts, and a drive component 53 that drives the lead screws 51 to rotate so that the crossbeam 52 can move relatively closer or further away from the ground. The impact swing arm 21 and the lifting swing arm 41 are both rotatably connected to the crossbeam 52. When the drive component 53 is activated, the two lead screws 51 rotate synchronously, driving the crossbeam 52 to move relatively closer or further away from the ground along the lead screws 51. This causes the impact swing arm 21 and the lifting swing arm 41 mounted on the crossbeam 52 to rise and fall synchronously, changing the installation height of the impact swing arm 21 relative to the test position to adapt to the impact test requirements of objects at different heights. It should be noted that the drive component 53 can be a motor-driven mechanism.

[0039] In some embodiments of the present invention, the counterweight 22 is replaceably connected to the impact swing arm 21, and the counterweight 22 has various shapes or weights. It should be noted that the counterweight 22 and the impact swing arm 21 can be fixed by bolts, pins, or other detachable connection methods. Different weights of counterweight 22 are used to provide different impact energies, and different shapes of counterweight 22 are used to meet the usage requirements of different impact test objects or test conditions. Before conducting the impact test, a counterweight 22 of appropriate weight or shape is selected according to the test requirements of the object being tested, and the selected counterweight 22 is installed on the free end of the impact swing arm 21 to adjust the impact performance of the impact swing arm 21. The counterweight 22 can be block-shaped, cylindrical, ring-shaped, or other structures that can provide a counterweight effect. As an optional implementation, the counterweight 22 can be made of steel, cast iron, tungsten alloy, or other materials with different densities. Different impact energies can be configured by changing the material density, external dimensions, or overall weight. All of the above implementations can realize the replacement function of the counterweight 22 of the present invention. This example does not constitute a limitation on the scope of protection of the present invention.

[0040] Example 3 The present invention also provides a method for controlling secondary impact during impact testing, using the impact testing device for preventing secondary impact as described in Embodiment 1 or 2, comprising the following steps: S10: The locking component 42 is locked in conjunction with the locking component 22a provided on the counterweight 22, so that the lifting swing arm 41 and the impact swing arm 21 are linked. S20: The lifting component pulls the lifting arm 41, causing the lifting arm 41 to drive the impact arm 21 to be raised to the preset impact height; the lifting component drives the lifting arm 41 to swing around its axis. Since the lifting arm 41 and the impact arm 21 are linked, the impact arm 21 rotates synchronously to the preset impact height, so that the impact arm 21 obtains the predetermined potential energy and provides the required impact energy for the impact test. S30: Release the locking state between the locking component 42 and the locking member 22a, so that the impact swing arm 21 swings toward the object under the action of gravity to complete the first impact; S40: After the first impact is completed, the impact arm 21 generates a swing motion; S50: When the impact swing arm 21 swings to the preset locking position, the suppression component 31 on the frame 1 cooperates with the locking component 32 on the impact swing arm 21 to lock the impact swing arm 21, restricting the impact swing arm 21 from continuing to swing, thereby preventing the impact swing arm 21 from swinging towards the test position again and generating a secondary impact, improving the stability of the impact test process and the reliability of the test results. In some embodiments of the present invention, the locking operation is performed when the impact swing arm 21 swings back to a position perpendicular to the ground.

[0041] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An impact test device for preventing secondary impact, comprising: frame; The impact mechanism includes an impact swing arm rotatably connected to the frame, and a counterweight disposed at the free end of the impact swing arm; The positioning and suppression mechanism includes a suppression component disposed on the frame and a locking component disposed on the impact swing arm. When the impact swing arm swings back to a preset locking position, the suppression component and the locking component cooperate to lock the impact swing arm. The lifting drive mechanism includes a lifting swing arm rotatably connected to the frame, a locking component disposed on the lifting swing arm, and a lifting component; The lifting assembly is connected to the lifting swing arm and provides rotational power to the lifting swing arm; The counterweight is provided with a locking component, and the locking assembly can cooperate with the locking component to lock or unlock, so as to realize the linkage or separation between the impact swing arm and the lifting swing arm. The suppression component includes two friction heads respectively disposed on both sides of the impact swing arm, and the two friction heads are respectively fixedly installed at corresponding positions on the frame; When the impact swing arm swings to the preset locking position, the two friction heads move closer to each other and clamp together to lock the locking member. The locking element is characterized in that it comprises: Two friction plates are disposed on both sides of the impact swing arm and are slidably connected to the impact swing arm. Two connecting pieces are fixedly connected to the corresponding ends of the two friction plates respectively. Two elastic elements are respectively provided in the annular structure surrounded by the two friction plates and the two connecting pieces. The two elastic elements are respectively provided between the impact swing arm and the two connecting pieces. The annular structure stops moving as a whole based on the squeezing and locking of the friction plates by the friction head. The impact swing arm continues to move a set distance and obtains motion buffer through the elastic deformation of the elastic elements. Each of the two connecting pieces is provided with a pressure sensing structure to sense the extrusion force from the corresponding elastic element; when the extrusion force is greater than a set threshold, the friction head is controlled to release the extrusion lock on the friction piece.

2. The impact test anti-secondary impact device according to claim 1, characterized in that, The locking member protrudes from the surface of the counterweight, and the locking assembly includes a locking box with an open end facing the locking member. The locking member extends into the locking box through the open end, and the locking assembly locks the locking member.

3. The impact test anti-secondary impact device according to claim 2, characterized in that, The locking member has a locking hole, and the locking assembly has a locking post that can be relatively close to or away from the inside of the locking hole.

4. The impact test anti-secondary impact device according to claim 2, characterized in that, The locking member has a locking groove, and a locking roller is rotatably connected in the locking groove. The locking assembly has a locking pin that can move relatively close to or away from the inside of the locking groove. During the process of the locking pin moving in and out of the locking groove, it makes rolling contact with the locking roller.

5. The impact test protection device against secondary impact according to claim 1, characterized in that, It also has a height adjustment mechanism, including two lead screws rotatably connected to the frame, a crossbeam sleeved on the two lead screws by nuts, and a drive component that drives the lead screws to rotate so that the crossbeam can move relatively closer or further away from the ground. Both the impact swing arm and the lifting swing arm are rotatably connected to the crossbeam.

6. A method for controlling secondary impact during impact testing, characterized in that, Using the impact test protection device as described in any one of claims 1 to 5 includes the following steps: The locking component engages with the locking member disposed on the counterweight to lock the lifting swing arm and the impact swing arm into a linked state. The lifting component pulls the lifting arm, causing the lifting arm to lift the impact arm to a preset impact height. Release the locking state between the locking component and the locking member, so that the impact swing arm swings toward the object under the action of gravity to complete the first impact; After the initial impact, the impact arm produces a return swing motion; When the impact swing arm swings to the preset locking position, the suppression component on the frame cooperates with the locking component on the impact swing arm to lock the impact swing arm and restrict the impact swing arm from continuing to swing.

7. The impact test secondary impact control method according to claim 6, characterized in that, When the impact swing arm swings back to a position perpendicular to the ground, a locking operation is performed.

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