Impact fatigue test device and method for high-strength impact-resistant safety closed protective door

Abstract

The present invention discloses an impact fatigue test device and method for a high-strength impact-proof safety and airtight protective door, which relates to the technical field of structural impact testing, including: a frame, which is the supporting body of the test device, and one side of the frame can be docked with an impact tester, and the impact tester is used as the impact body for the protective door to test the impact fatigue of the protective door; a transfer component for force transfer is arranged at the docking position between the frame and the impact tester, and the transfer component converts the impact tester with different impact directions into a lateral impact force; a swingable impact table, a pulling structure is arranged at one end of the impact table to control the swing angle of the impact table, and the other end of the impact table extends to the inside of the frame and can swing relative to the frame. When conducting an impact fatigue test on a protective door, the present application determines the impact fatigue of the protective door by constructing different door frame wall structures, and correspondingly detecting the force conduction of the door frame wall and the impact force received by the protective door when the protective door receives an impact.

Description

Technical Field

[0001] The invention relates to the technical field of structural impact testing, and in particular to an impact fatigue testing device and method for a high-strength anti-impact safety closed protective door. Background Art

[0002] The main impact sources of protective doors usually include the following:

[0003] Explosion shock wave: This is the most commonly considered impact source in the design of protective doors, especially in military and civil defense projects. The shock wave generated by the explosion will exert huge instantaneous pressure on the protective door.

[0004] Heavy object impact: For example, in an industrial environment, a protective door may need to resist accidental impact with heavy machinery or equipment.

[0005] Storms and natural disasters: In some cases, security doors may also need to withstand the impact of natural disasters such as strong winds, hurricanes, or earthquakes.

[0006] Announcement No. CN107941446B discloses an impact fatigue test device suitable for tunnel protection doors, which belongs to the technical field of tunnel protection doors. It sets the tunnel protection door vertically and simulates clamping and fastening the top and bottom, and sets No. 1 and No. 2 electromagnets on both sides of the protection door to use electromagnetic force to simulate the stress conditions of the two sides of the protection door when the impact load is cyclically applied, and by changing the electromagnetic force size and switching frequency of No. 1 and No. 2 electromagnets, the stress conditions of the protection door under various working conditions can be simulated, greatly improving the accuracy of the impact fatigue test. The impact fatigue test device suitable for tunnel protection doors of the present invention has a simple structure, is easy to operate, can effectively simulate reciprocating force working conditions, can more realistically simulate the high-speed piston wind reciprocating impact of the protection door in actual working conditions, and the test data is more accurate and the results are more reliable.

[0007] For protective doors with the same structure and material, the impact strength they can theoretically withstand is the same, and slight structural differences will not cause excessive changes in the impact strength. The installation position of the protective door and the design of its door frame wall correspond to the impact resistance of the protective door. By setting a weak layer at the junction of the door frame wall and the lining, the stress concentration caused by the impact load can be reduced, thereby improving the overall impact resistance.

[0008] However, existing test devices all test the impact fatigue of protective doors by fixing the door frame or directly applying impact force to the protective door. The design structure of the door frame wall reduces the stress concentration caused by the impact load differently, resulting in a large difference between the impact fatigue of the protective door obtained through the test and the actual impact fatigue corresponding to door frame walls with different designs. Summary of the invention

[0009] One of the purposes of the present invention is to provide an impact fatigue testing device and method for high-strength impact-resistant safety and sealed protective doors. Different door frame wall structures can be set to obtain the door frame wall's ability to handle stress concentration caused by impact loads during the impact process and the changes in the protective door under impact, so as to determine the impact fatigue of the protective door when it is installed on door frame walls with different structures.

[0010] To achieve the above purpose, the present invention is implemented by the following technical scheme: an impact fatigue test device for a high-strength anti-impact safety closed protective door, comprising:

[0011] The frame is the supporting body of the test device. One side of the frame can be connected to the impact tester, which is used as the impact body for the protective door to test the impact fatigue of the protective door.

[0012] A transfer component for force transfer is arranged at the docking position between the frame and the impact tester, and the transfer component converts the impact tester with different impact directions into a lateral impact force;

[0013] A swingable impact platform, one end of which is provided with a pulling structure to control the swing angle of the impact platform, and the other end of which extends into the interior of the frame and can swing relative to the frame. The impact platform is used for forming the door frame wall, and the protective door is installed in the door frame wall during the impact process;

[0014] A sensor matrix is ​​arranged inside the impact platform. When the impact platform is in a state perpendicular to the ground, the sensor matrix contacts the door frame wall and the protective door and obtains force conduction data of the door frame wall and the protective door;

[0015] The control terminal is used to control the angle of the impact table, and the control terminal remotely transmits data with the sensor matrix to generate a force conduction distribution map based on the impact point position.

[0016] In one or more embodiments of the present invention, the frame includes a clamping assembly for clamping the door frame wall inside the impact platform, the clamping assembly is arranged at least at three sides of the impact platform and contacts the door frame wall, the clamping assembly is retractable, and the clamping assembly includes:

[0017] The extrusion plate contacts the door frame wall and is elastically arranged. A telescopic rod is arranged at one end of the extrusion plate away from the door frame wall to control the position of the extrusion plate. The telescopic rod pushes the extrusion plate to contact the door frame wall to form an extrusion on the door frame wall.

[0018] An elastic plate is arranged outside the impact platform, and the elastic plate is fixed on the outside of the impact platform. When the impact platform is perpendicular to the frame, the elastic plate is squeezed.

[0019] In one or more embodiments of the present invention, the transfer assembly comprises:

[0020] The impact hammer is retractably installed inside the frame. The impact hammer is perpendicular to the protective door in the impact test state. A pipeline is arranged on the back of the impact hammer. The end of the pipeline away from the impact hammer extends to the position where the frame is docked with the impact tester. A bearing platform for transmitting the impact force of the impact tester is arranged. The bearing platform is filled with a medium between the impact hammer.

[0021] The electric control valve is installed in the pipeline to control the pipeline connection path.

[0022] In one or more embodiments of the present invention, the pulling structure includes:

[0023] The motor as the driving element is fixed on the top of the frame, and the output end of the motor is sleeved with a winding wheel that moves synchronously with the output end of the motor;

[0024] The two ends of the wire rope are respectively connected to the winding wheel and the impact platform. The motor drives the winding wheel to rotate to control the length of the wire rope outside the winding wheel to control the position of the impact platform.

[0025] In one or more embodiments of the present invention, the impact station comprises:

[0026] A bottom frame is installed inside the frame body and can swing relative to the frame body, and the elastic plate is located on the outer wall of the bottom frame;

[0027] A plurality of installation bins for installing the sensor matrix are arranged on the inner side of the base frame, a cover plate is arranged at one end of the installation bin facing the door frame wall to seal the installation bin, and a connecting rod mechanism is arranged on the inner side of one side of the cover plate to control the position of the cover plate;

[0028] The gusset plate is arranged on one side of the base frame, and the corner position of the gusset plate is magnetically arranged. Electromagnets are installed on the inside of the base frame and the frame body. When the electromagnets are energized, the gusset plate is magnetically attracted to change the position of the gusset plate.

[0029] In one or more embodiments of the present invention, the linkage mechanism comprises:

[0030] The electric push rod is fixed inside the installation chamber, the telescopic rod of the electric push rod is provided with a slide, and a slide groove matching the slide groove is provided inside the installation chamber, and the slide groove slides inside the slide groove and cannot be separated from the slide groove;

[0031] The swing rod is swingably arranged inside the installation bin, and the two ends of the swing rod are respectively connected to the cover plate and the slide, and the connecting end of the slide and the swing rod is bendable.

[0032] In one or more embodiments of the present invention, the sensor matrix includes:

[0033] A fixing plate is detachably mounted on the outside of the installation bin, and the fixing plate is fixed to the outer wall of the installation bin by bolts;

[0034] The force feedback sensor is installed on the inner side of the fixed plate. The force feedback sensor consists of two parts. The main body of the force feedback sensor is detachably installed on the inner side of the fixed plate. The detection end of the force feedback sensor moves synchronously with the telescopic end of the electric push rod. The detection end of the force feedback sensor is controlled by the electric push rod.

[0035] A positioning unit is arranged on one side of the force feedback sensor. The positioning unit is configured in combination with the force feedback sensor. When the force feedback sensor transmits data remotely to the control terminal, the positioning unit will synchronously feedback the position of the sensor.

[0036] The connecting piece is installed on the outside of the force feedback sensor and is used to connect the force feedback sensor and the electric push rod.

[0037] In one or more embodiments of the present invention, the connector includes:

[0038] A mounting head is mounted on the outside of the force feedback sensor body, a telescopic head is arranged on one side of the mounting head facing the detection end of the force feedback sensor, the telescopic head is slidably arranged on the inside of the mounting head, and the detection end of the force feedback sensor is mounted on the inside of the telescopic head;

[0039] The magnetic ring is fixed on the outside of the telescopic head. A card plate is sleeved on the outside of the telescopic end of the electric push rod, and the card plate is controlled by the telescopic end of the electric push rod;

[0040] The jack is coaxially arranged on the inner side of the card plate with the magnetic ring, and the card plate is magnetically arranged to form magnetic attraction to the magnetic ring.

[0041] The present application also provides an impact fatigue test method, which is used in the above-mentioned impact fatigue test device, comprising the following steps:

[0042] The pulling structure controls the impact table to be parallel to the bottom surface of the frame. In this state, the test personnel build the door frame wall according to the door frame wall structure where the protective door is installed. After the door frame wall is stable, the protective door is installed on the inner side of the door frame wall.

[0043] The pulling structure controls the impact table to be perpendicular to the bottom surface of the frame, docks the impact tester with the frame, and adjusts the impact strength of the impact tester;

[0044] The impact testing machine impacts the transfer assembly, and the transfer assembly impacts the protective door to perform an impact fatigue test;

[0045] Calculation of force transmission changes:

[0046] Model building: Use finite element software to build a three-dimensional model of the protective door and door frame wall;

[0047] Apply impact load: Apply impact load to the model to simulate the impact in actual use;

[0048] Monitoring stress and strain: During the impact process, the stress and strain distribution of the guard door and the door frame wall is monitored using a sensor matrix;

[0049] Data analysis: Determine the changes in force conduction through data analysis;

[0050] Calculation of impact fatigue:

[0051] Fatigue life prediction: Based on the fatigue characteristic curve of the material, predict the fatigue life of the protective door under repeated impact;

[0052] Cumulative damage model: Use the cumulative damage model to calculate the cumulative damage of the protective door under multiple impacts;

[0053] Experimental verification: The calculation results are verified through actual impact fatigue experiments.

[0054] In one or more embodiments of the present invention, the sensor matrix communicates with the control terminal, and the data acquired by the sensor matrix is ​​transmitted to the control terminal, and the control terminal processes the data.

[0055] Through the above technical solution, the present invention has the following beneficial effects:

[0056] 1. When conducting an impact fatigue test on a protective door, the present application determines the impact fatigue of the protective door by constructing different door frame wall structures to detect the force conduction of the door frame wall and the impact force received by the protective door when the protective door receives an impact. The precise impact fatigue of the protective door after installation can be further obtained according to the different door frame wall structures where the protective door is installed.

[0057] 2. During the test of the protective door, the position of the door frame wall is fixed, and force conduction detection is performed on the door frame wall at multiple points to obtain force conduction data at different door frame wall positions. Combined with the position of the impact point, the absorption of the impact force by the door frame wall is determined. During the impact test, the door frame wall is kept upright to further restore the state of the protective door under impact after installation.

[0058] 3. The present application adjusts the inclination angle of the door frame wall so that the door frame wall can be constructed on the ground during construction, so as to facilitate the construction of the door frame wall and the installation of the protective door, thereby facilitating the operation of the construction workers. During the process of constructing the door frame wall, the position of the detection point can be shielded to ensure the flatness of one side of the door frame wall.

[0059] 4. In order to ensure the stability of the door frame wall, during the impact of the protective door, multiple sides of the door frame wall are in a clamped state to ensure the stability of the edge position of the door frame wall. During the impact fatigue test, multiple sensors are installed on the protective door and the door frame wall to detect force conduction, and a force conduction distribution map is constructed based on the position of the impact point and the detection data of sensors at different positions, which is displayed on the control terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A perspective view of the present invention;

[0061] Figure 2 is a cross-sectional view of the frame of the present invention;

[0062] Figure 3 It is a partial structural schematic diagram of the present invention;

[0063] Figure 4 is a side view of the present invention;

[0064] Figure 5 It is a schematic diagram of the pulling removal structure of the present invention;

[0065] Figure 6 This is a schematic diagram of the frame-removing structure of the present invention;

[0066] Figure 7 It is a schematic diagram of the structure of the impact platform of the present invention;

[0067] Figure 8 It is a plan view of the impact table structure of the present invention;

[0068] Fig. 9 It is a schematic diagram of the chassis structure of the present invention;

[0069] Fig.10 It is a cross-sectional view of the installation bin of the present invention;

[0070] Fig.11 It is a schematic diagram of the internal structure of the installation bin of the present invention;

[0071] Fig.12 The connecting member of the present invention explodes Figure 1 ;

[0072] Fig.13 The connecting member of the present invention explodes Figure 2 .

[0073] In the figure: 1 frame, 2 transfer assembly, 3 impact table, 4 pulling structure, 5 sensor matrix, 6 control terminal;

[0074] 10 clamping assembly: 101 extrusion plate, 102 telescopic rod, 103 elastic plate;

[0075] 201 impact hammer, 202 pipeline, 203 bearing platform, 204 electric control valve;

[0076] 401 motor, 402 reel, 403 wire rope;

[0077] 301 base frame, 302 installation bin, 303 cover plate, 304 connecting rod mechanism: 3041 electric push rod, 3042 slide, 3043 slide slot, 3044 swing rod; 305 buckle plate, 306 electromagnet;

[0078] 501 fixing plate, 502 force feedback sensor, 503 positioning unit, 504 connecting parts: 5041 mounting head, 5042 telescopic head, 5043 magnetic ring, 5044 card board, 5045 socket. DETAILED DESCRIPTION

[0079] The following will disclose multiple embodiments of the present invention with the accompanying drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. And if it is possible to implement, the features of different embodiments can be applied interchangeably.

[0080] Unless otherwise defined, all words (including technical and scientific terms) used herein have their usual meanings, which can be understood by those familiar with this field. Furthermore, the definitions of the above words in commonly used dictionaries should be interpreted in the content of this specification as consistent with the meanings of the relevant fields of the present invention. Unless otherwise clearly defined, these words will not be interpreted as idealized or overly formal meanings.

[0081] See also Figure 1-Figure 13 The present invention provides an impact fatigue testing device for a high-strength impact-proof safety and airtight protective door. The impact fatigue of the protective door is tested through an impact fatigue test, and a door frame wall is constructed to detect the force conduction between the protective door and the door frame wall during the impact process.

[0082] In one embodiment, the impact fatigue testing device comprises:

[0083] The frame 1 is the supporting body of the test device. One side of the frame 1 can be connected to the impact tester, and the impact tester is used as the impact body for the protective door to test the impact fatigue of the protective door;

[0084] A transfer assembly 2 for force transfer is provided at the docking position between the frame 1 and the impact tester, and the transfer assembly 2 converts the impact tester with different impact directions into a lateral impact force;

[0085] A swingable impact platform 3, one end of which is provided with a pulling structure 4 to control the swing angle of the impact platform 3, the other end of which extends into the interior of the frame 1 and can swing relative to the frame 1, the impact platform 3 is used for forming the door frame wall, and the protective door is installed in the door frame wall during the impact process;

[0086] The sensor matrix 5 is arranged inside the impact platform 3. When the impact platform 3 is in a state perpendicular to the ground, the sensor matrix 5 contacts the door frame wall and the protective door and obtains the force conduction data of the door frame wall and the protective door;

[0087] The control terminal 6 is used to control the angle of the impact platform 3, and the control terminal 6 and the sensor matrix 5 remotely transmit data to generate a force conduction distribution map based on the impact point position.

[0088] In this embodiment, the swingable impact platform 3 has at least two functions. First, when it is in an inclined or parallel state to the ground, it is convenient for constructing the door frame wall. Second, when it is perpendicular to the bottom surface of the frame 1, it is used to test the impact fatigue of the protective door.

[0089] Among them, since the impact platform 3 itself has a certain weight and is controlled by pulling, when it is impacted, the impact platform 3 is not fixed, resulting in the pulling structure 4 being stressed, which affects the stability of the pulling structure 4;

[0090] Optionally, a hydraulic rod is provided outside the impact platform 3 at a position perpendicular to the bottom surface of the frame 1 , and the hydraulic rod can be telescopically inserted into the impact platform 3 to fix the impact platform 3 and limit the position of the impact platform 3 .

[0091] In one embodiment, the frame 1 includes a clamping assembly 10 for clamping the door frame wall inside the impact platform 3. The clamping assembly 10 is arranged at least at three sides of the impact platform 3 and contacts the door frame wall. The clamping assembly 10 is retractable and includes:

[0092] The extrusion plate 101 contacts the door frame wall and is elastically arranged. A telescopic rod 102 is arranged at one end of the extrusion plate 101 away from the door frame wall to control the position of the extrusion plate 101. The telescopic rod 102 pushes the extrusion plate 101 to contact the door frame wall to form an extrusion on the door frame wall.

[0093] An elastic plate 103 is disposed outside the impact platform 3 , and the elastic plate 103 is fixed to the outside of the impact platform 3 . When the impact platform 3 is perpendicular to the frame 1 , the elastic plate 103 is pressed.

[0094] In this embodiment, when the impact platform 3 is perpendicular to the bottom surface of the frame 1, even if the position of the impact platform 3 is controlled by the pulling structure 4, the impact platform 3 cannot be tilted. Instead, the elastic force of the elastic plate 103 is used to support the impact platform 3. When the hydraulic rod is inserted into the impact platform 3, the angle of the impact platform 3 is corrected so that the impact platform 3 is completely perpendicular to the bottom surface of the frame 1.

[0095] In order to facilitate the correction of the impact platform 3 by the hydraulic rod, the outer edge of the through hole of the impact platform 3 for inserting the hydraulic rod is arranged in a funnel shape, and the hydraulic rod can also be inserted into the through hole when the impact platform 3 is not in a completely vertical state.

[0096] In one embodiment, the transfer assembly 2 comprises:

[0097] The impact hammer 201 is telescopically mounted on the inner side of the frame 1. The impact hammer 201 is perpendicular to the protective door in the impact test state. A pipeline 202 is arranged on the back of the impact hammer 201. The end of the pipeline 202 away from the impact hammer 201 extends to the position where the frame 1 is docked with the impact tester, and a bearing platform 203 for transmitting the impact force of the impact tester is arranged. The bearing platform 203 is filled with a medium between the impact hammer 201.

[0098] The electric control valve 204 is installed in the pipeline 202 to control the communication path of the pipeline 202.

[0099] In this embodiment, the setting of the transfer component 2 can transfer different impact force application directions into impact forces perpendicular to the protective door, thereby realizing impact on the protective door, and the impact hammer 201 is set to be multiple. When in use, the state of the electric control valve 204 is changed, and the connection path between the supporting platform 203 and the impact hammer 201 is adjusted to make different impact hammers 201 impact the protective door.

[0100] Among them, the supporting platform 203 is arranged at the impact position of the impact testing machine. For example, the impact testing machine connected to the frame 1 is a drop hammer impact testing machine, and the drop hammer impact testing machine impacts the supporting platform 203. The movement of the supporting platform 203 pushes the impact hammer 201 to impact the protective door through the medium.

[0101] Optionally, in order to facilitate the resetting of the carrier 203, an electromagnetic ring is provided inside the carrier 203. After the drop hammer impact tester falls, the carrier 203 magnetically attracts the drop hammer and is driven to reset by the drop hammer.

[0102] In one embodiment, the pulling structure 4 includes:

[0103] The motor 401 as a driving element is fixed to the top of the frame 1, and the output end of the motor 401 is sleeved with a winding wheel 402 that moves synchronously with the output end of the motor 401;

[0104] The two ends of the steel wire rope 403 are respectively connected to the winding wheel 402 and the impact platform 3. The motor 401 drives the winding wheel 402 to rotate to control the length of the steel wire rope 403 outside the winding wheel 402 to control the position of the impact platform 3.

[0105] In this embodiment, two mounting rings for fixing the wire rope 403 are arranged on the outside of the impact platform 3. The mounting rings are detachably threadedly installed on the top of the impact platform 3, and the wire rope 403 passes through the mounting rings. In order to ensure the stability of the swing angle control of the impact platform 3, the pulling structure 4 is symmetrically arranged along the symmetry plane of the impact platform 3, and the pulling structure 4 moves to pull the two ends of the impact platform 3.

[0106] In one embodiment, the impact station 3 comprises:

[0107] The bottom frame 301 is installed inside the frame body 1 and can swing relative to the frame body 1, and the elastic plate 103 is located on the outer wall of the bottom frame 301;

[0108] A plurality of installation chambers 302 for installing the sensor matrix 5 are arranged inside the base frame 301, a cover plate 303 is arranged at one end of the installation chamber 302 facing the door frame wall to seal the installation chamber 302, and a connecting rod mechanism 304 is arranged inside one side of the cover plate 303 to control the position of the cover plate 303;

[0109] The pinch plate 305 is arranged on one side of the base frame 301 . The corners of the pinch plate 305 are magnetically arranged. Electromagnets 306 are installed on the inner sides of the base frame 301 and the frame body 1 . When the electromagnets 306 are energized, the pinch plate 305 is magnetically attracted to change its position.

[0110] In this embodiment, the setting of the gusset plate 305 can fit the base frame 301. When the door frame wall is constructed, the gusset plate 305 is combined with the base frame 301 to limit one side of the door frame wall, thereby ensuring the stability of the door frame wall during the construction process. During the construction of the door frame wall, the electromagnet 306 installed on the inner side of the base frame 301 magnetically attracts the gusset plate 305 to ensure the stability of the gusset plate 305. When the door frame wall is constructed and the protective door impact test is performed, the electromagnet 306 on the inner side of the frame body 1 magnetically attracts the gusset plate 305 to separate the gusset plate 305 from the door frame wall.

[0111] In the process of pouring concrete for the door frame wall, in order to avoid the structure of concrete and sensor matrix 5, the installation chamber 302 is sealed by a buckle plate 305 to avoid the influence of concrete molding on the sensor matrix 5.

[0112] In one embodiment, the linkage mechanism 304 includes:

[0113] The electric push rod 3041 is fixed inside the installation chamber 302. The telescopic rod 102 of the electric push rod 3041 is provided with a slide 3042. The installation chamber 302 is provided with a slide groove 3043 matching the slide 3042. The slide 3042 slides inside the slide groove 3043 and cannot be separated from the slide groove 3043.

[0114] The swing rod 3044 is swingably arranged inside the installation chamber 302, and the two ends of the swing rod 3044 are respectively connected to the cover plate 303 and the slide 3042, and the connecting end of the slide 3042 and the swing rod 3044 is bendable.

[0115] In this embodiment, a swing rod 3044 is provided to control the position of the cover plate 303. When the electric push rod 3041 pushes the slide 3042 to move, one end of the slide 3042 connected to the swing rod 3044 drives the swing rod 3044 to swing in an arc shape. The swing of the swing rod 3044 drives the cover plate 303 to move. The seal of the cover plate 303 for the installation chamber 302 is opened, and the sensor matrix 5 can extend outward to detect the force transmission of the door frame wall and the protective door.

[0116] The electric push rod 3041 can also push the sensor matrix 5 to extend outward. When the electric push rod 3041 pushes the cover 303 to open, the sensor matrix 5 extends outward, contacts the door frame wall and the protective door, and detects the force conduction of the door frame wall and the protective door.

[0117] In one embodiment, the sensor matrix 5 comprises:

[0118] The fixing plate 501 is detachably mounted on the outside of the installation chamber 302, and the fixing plate 501 is fixed to the outer wall of the installation chamber 302 by bolts;

[0119] The force feedback sensor 502 is installed on the inner side of the fixed plate 501. The force feedback sensor 502 consists of two parts. The main body of the force feedback sensor 502 is detachably installed on the inner side of the fixed plate 501. The detection end of the force feedback sensor 502 moves synchronously with the telescopic end of the electric push rod 3041. The detection end of the force feedback sensor 502 is controlled by the electric push rod 3041.

[0120] The positioning unit 503 is disposed on one side of the force feedback sensor 502. The positioning unit 503 is configured in combination with the force feedback sensor 502. When the force feedback sensor 502 is transmitting data remotely through the control terminal 6, the positioning unit 503 will synchronously feedback the position of the sensor.

[0121] The connecting member 504 is installed on the outside of the force feedback sensor 502 and is used to connect the force feedback sensor 502 and the electric push rod 3041 .

[0122] In this embodiment, the force conduction data of different positions of the door frame wall and the protective door are detected by the force feedback sensor 502. After the force conduction data is obtained, according to the positioning of the force feedback sensor 502 by the positioning unit 503, the data of different positions of the force feedback sensor 502 can be generated according to the position and transmitted to the control terminal 6.

[0123] Optionally, the positioning unit 503 is a locator.

[0124] In one embodiment, the connector 504 includes:

[0125] The mounting head 5041 is mounted on the outside of the force feedback sensor 502 body. A telescopic head 5042 is arranged on the side of the mounting head 5041 facing the detection end of the force feedback sensor 502. The telescopic head 5042 is slidably arranged on the inside of the mounting head 5041. The detection end of the force feedback sensor 502 is mounted on the inside of the telescopic head 5042.

[0126] The magnetic ring 5043 is fixed on the outside of the telescopic head 5042. A clamping plate 5044 is sleeved on the outside of the telescopic end of the electric push rod 3041. The clamping plate 5044 is controlled by the telescopic end of the electric push rod 3041.

[0127] The jack 5045 is coaxially arranged on the inner side of the card plate 5044 with the magnetic ring 5043 . The card plate 5044 is magnetically arranged to form magnetic attraction to the magnetic ring 5043 .

[0128] In this embodiment, since the main body of the force feedback sensor 502 is connected to the detection end through a wire, and the material of the wire is relatively soft, it is more difficult to install the force feedback sensor 502. However, through the setting of the connecting piece 504, during installation, the position of the telescopic head 5042 is controlled through the setting of the magnetic card plate 5044 and the magnetic ring 5043, and the telescopic head 5042 is coaxial with the magnetic ring 5043, so it can be stably inserted into the position of the socket 5045 on the inner side of the card plate 5044.

[0129] The present application also provides an impact fatigue test method, which is used in the above-mentioned impact fatigue test device, comprising the following steps:

[0130] The pulling structure 4 controls the impact table 3 to be parallel to the bottom surface of the frame 1. In this state, the tester builds the door frame wall according to the door frame wall structure where the protective door is installed, and installs the protective door on the inner side of the door frame wall after the position of the door frame wall is stable;

[0131] The pulling structure 4 controls the impact table 3 to be perpendicular to the bottom surface of the frame 1, and docks the impact tester with the frame 1 to adjust the impact strength of the impact tester;

[0132] The impact testing machine impacts the transfer assembly 2, and the transfer assembly 2 impacts the protective door to perform an impact fatigue test;

[0133] Calculation of force transmission changes:

[0134] Model building: Use finite element software to build a three-dimensional model of the protective door and door frame wall;

[0135] Apply impact load: Apply impact load to the model to simulate the impact in actual use;

[0136] Monitoring stress and strain: During the impact process, the stress and strain distribution of the protective door and the door frame wall is monitored using the sensor matrix 5;

[0137] Data analysis: Determine the changes in force conduction through data analysis;

[0138] Calculation of impact fatigue:

[0139] Fatigue life prediction: Based on the fatigue characteristic curve of the material, predict the fatigue life of the protective door under repeated impact;

[0140] Cumulative damage model: Use the cumulative damage model to calculate the cumulative damage of the protective door under multiple impacts;

[0141] Experimental verification: The calculated results are verified through actual impact fatigue experiments. The experimental steps include repeatedly applying impact force, monitoring damage evolution and analyzing fatigue life.

[0142] For example, a guard door is subject to a force of 5000 Newtons per impact, 10 impacts per minute. The following steps are used to calculate:

[0143] Stress analysis: Calculate the maximum stress and strain of the guard door under each impact.

[0144] Fatigue life prediction: According to the SN curve of the material, determine the fatigue life at that stress level. For example, if the material can withstand 105 impacts under a stress of 5000 Newtons, the fatigue life is 105 times.

[0145] Cumulative damage calculation: Use Miner's law to calculate the cumulative damage. Assuming 1000 impacts per day, the cumulative damage is 0.01.

[0146] Experimental verification: Through actual experiments, the calculation results are verified to ensure the reliability of the protective door in actual use.

[0147] In one embodiment, the sensor matrix 5 communicates with the control terminal 6, and transmits the data acquired by the sensor matrix 5 to the control terminal 6, which then processes the data.

[0148] Although the present invention is disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the attached claims.

Claims

1. Impact fatigue test device for high-strength anti-impact safety closed protective door, characterized in that: include: The frame is the supporting body of the test device. One side of the frame can be connected to the impact tester, which is used as the impact body for the protective door to test the impact fatigue of the protective door. A transfer component for force transfer is arranged at the docking position between the frame and the impact tester, and the transfer component converts the impact tester with different impact directions into a lateral impact force; A swingable impact platform, one end of which is provided with a pulling structure to control the swing angle of the impact platform, and the other end of which extends into the interior of the frame and can swing relative to the frame. The impact platform is used for forming the door frame wall, and the protective door is installed in the door frame wall during the impact process; A sensor matrix is ​​arranged inside the impact platform. When the impact platform is in a state perpendicular to the ground, the sensor matrix contacts the door frame wall and the protective door and obtains force conduction data of the door frame wall and the protective door; The control terminal is used to control the angle of the impact table, and the control terminal remotely transmits data with the sensor matrix to generate a force conduction distribution map based on the impact point position.

2. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 1 is characterized in that: The frame includes a clamping assembly for clamping the door frame wall inside the impact platform. The clamping assembly is arranged at least at three sides of the impact platform and contacts the door frame wall. The clamping assembly can be retracted and includes: The extrusion plate contacts the door frame wall and is elastically arranged. A telescopic rod is arranged at one end of the extrusion plate away from the door frame wall to control the position of the extrusion plate. The telescopic rod pushes the extrusion plate to contact the door frame wall to form an extrusion on the door frame wall. An elastic plate is arranged outside the impact platform, and the elastic plate is fixed on the outside of the impact platform. When the impact platform is perpendicular to the frame, the elastic plate is squeezed.

3. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 2 is characterized in that: The transfer components include: The impact hammer is retractably installed inside the frame. The impact hammer is perpendicular to the protective door in the impact test state. A pipeline is arranged on the back of the impact hammer. The end of the pipeline away from the impact hammer extends to the position where the frame is docked with the impact tester. A bearing platform for transmitting the impact force of the impact tester is arranged. The bearing platform is filled with a medium between the impact hammer. The electric control valve is installed in the pipeline to control the pipeline connection path.

4. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 3 is characterized in that: The pulling structure includes: The motor as the driving element is fixed on the top of the frame, and the output end of the motor is sleeved with a winding wheel that moves synchronously with the output end of the motor; The two ends of the wire rope are respectively connected to the winding wheel and the impact platform. The motor drives the winding wheel to rotate to control the length of the wire rope outside the winding wheel to control the position of the impact platform.

5. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 4 is characterized in that: The impact table includes: A bottom frame is installed inside the frame body and can swing relative to the frame body, and the elastic plate is located on the outer wall of the bottom frame; A plurality of installation bins for installing the sensor matrix are arranged on the inner side of the base frame, a cover plate is arranged at one end of the installation bin facing the door frame wall to seal the installation bin, and a connecting rod mechanism is arranged on the inner side of one side of the cover plate to control the position of the cover plate; The gusset plate is arranged on one side of the base frame, and the corner position of the gusset plate is magnetically arranged. Electromagnets are installed on the inside of the base frame and the frame body. When the electromagnets are energized, the gusset plate is magnetically attracted to change the position of the gusset plate.

6. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 5 is characterized in that: The connecting rod mechanism includes: The electric push rod is fixed inside the installation chamber, the telescopic rod of the electric push rod is provided with a slide, and a slide groove matching the slide groove is provided inside the installation chamber, and the slide groove slides inside the slide groove and cannot be separated from the slide groove; The swing rod is swingably arranged inside the installation bin, and the two ends of the swing rod are respectively connected to the cover plate and the slide, and the connecting end of the slide and the swing rod is bendable.

7. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 6 is characterized in that: The sensor matrix includes: A fixing plate is detachably mounted on the outside of the installation bin, and the fixing plate is fixed to the outer wall of the installation bin by bolts; The force feedback sensor is installed on the inner side of the fixed plate. The force feedback sensor consists of two parts. The main body of the force feedback sensor is detachably installed on the inner side of the fixed plate. The detection end of the force feedback sensor moves synchronously with the telescopic end of the electric push rod. The detection end of the force feedback sensor is controlled by the electric push rod. A positioning unit is arranged on one side of the force feedback sensor. The positioning unit is configured in combination with the force feedback sensor. When the force feedback sensor transmits data remotely to the control terminal, the positioning unit will synchronously feedback the position of the sensor. The connecting piece is installed on the outside of the force feedback sensor and is used to connect the force feedback sensor and the electric push rod.

8. The impact fatigue test device for high-strength anti-impact safety sealed protective door according to claim 7 is characterized in that: Connectors include: A mounting head is mounted on the outside of the force feedback sensor body, a telescopic head is arranged on one side of the mounting head facing the detection end of the force feedback sensor, the telescopic head is slidably arranged on the inside of the mounting head, and the detection end of the force feedback sensor is mounted on the inside of the telescopic head; The magnetic ring is fixed on the outside of the telescopic head. A card plate is sleeved on the outside of the telescopic end of the electric push rod, and the card plate is controlled by the telescopic end of the electric push rod; The jack is coaxially arranged on the inner side of the card plate with the magnetic ring, and the card plate is magnetically arranged to form magnetic attraction to the magnetic ring.

9. An impact fatigue test method, used for an impact fatigue test device for a high-strength impact-resistant safety sealed protective door as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: The pulling structure controls the impact table to be parallel to the bottom surface of the frame. In this state, the test personnel build the door frame wall according to the door frame wall structure where the protective door is installed. After the door frame wall is stable, the protective door is installed on the inner side of the door frame wall. The pulling structure controls the impact table to be perpendicular to the bottom surface of the frame, docks the impact tester with the frame, and adjusts the impact strength of the impact tester; The impact testing machine impacts the transfer assembly, and the transfer assembly impacts the protective door to perform an impact fatigue test; Calculation of force transmission changes: Model building: Use finite element software to build a three-dimensional model of the protective door and door frame wall; Apply impact load: Apply impact load to the model to simulate the impact in actual use; Monitoring stress and strain: During the impact process, the stress and strain distribution of the guard door and the door frame wall is monitored using a sensor matrix; Data analysis: Determine the changes in force conduction through data analysis; Calculation of impact fatigue: Fatigue life prediction: Based on the fatigue characteristic curve of the material, predict the fatigue life of the protective door under repeated impact; Cumulative damage model: Use the cumulative damage model to calculate the cumulative damage of the protective door under multiple impacts; Experimental verification: The calculation results are verified through actual impact fatigue experiments.

10. The impact fatigue test method according to claim 9, characterized in that: The sensor matrix communicates with the control terminal, and transmits the data acquired by the sensor matrix to the control terminal, which processes the data.

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