Stress fatigue test system

Abstract

The embodiment of the invention provides a stress fatigue test system. The stress fatigue test system comprises a control device, at least one impact device and a supporting device, the impact device comprises an impact table, a driving assembly and an impact head; the impact table is used for supporting the driving assembly and the impact heads, the driving assembly is connected with at least one impact head, and the driving assembly is electrically connected with the control device; the supporting device is positioned on one side of the impact head and is used for mounting to-be-tested equipment; and the control device is used for controlling the driving assembly, so that the driving assembly drives the impact head to move towards the to-be-tested equipment, and the impact head applies acting force on the to-be-tested equipment from different directions according to the set frequency of the impact acting force and the set magnitude of the impact acting force. According to the stress fatigue test system provided by the embodiment of the invention, the accuracy of the test result of the wind load bearing capacity of the outdoor communication equipment can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of fatigue strength testing devices, and in particular to a stress fatigue testing system. Background Art

[0002] With the rapid development of communication technology, more and more communication equipment such as wireless base stations and edge servers are installed outdoors.

[0003] Outdoor communication equipment can be installed on the outside of a building or on the ground through a mounting bracket. These outdoor communication equipment are subjected to loads from wind forces in multiple directions for a long time (the loads from wind forces are referred to as wind loads for short). Therefore, outdoor communication equipment needs to undergo a wind load fatigue strength simulation test to test the fatigue damage of the connection between the outdoor communication equipment and the mounting bracket after being subjected to wind loads from multiple directions for a long time, thereby testing the wind load bearing capacity of the outdoor communication equipment. In the related art, the wind load bearing capacity of the outdoor communication equipment can be tested by applying an impact force to the outdoor communication equipment.

[0004] In the related art, the accuracy of the test results of the wind load bearing capacity of outdoor communication equipment is low. Summary of the invention

[0005] The embodiment of the present application provides a stress fatigue testing system, which can improve the accuracy of the test results of the wind load bearing capacity of outdoor communication equipment.

[0006] A first aspect of an embodiment of the present application provides a stress fatigue testing system, comprising a control device, at least one impact device and a supporting device; the impact device comprises an impact table, a driving assembly and an impact head; the impact table is used to support the driving assembly and the impact head, the driving assembly is connected to the impact head, and the driving assembly is electrically connected to the control device; the supporting device is located on one side of the impact head, and the supporting device is used to install a device to be tested; the control device is used to control the driving assembly so that the driving assembly drives the impact head to apply force on the device to be tested from different directions according to a set frequency of the impact force and a set magnitude of the impact force.

[0007] The stress fatigue test system provided by the embodiment of the present application is provided with a control device, an impact device and a support device; the impact device includes an impact table, a drive assembly and an impact head; the impact table is used to support the drive assembly and the impact head, the drive assembly is connected to the impact head, and the drive assembly is electrically connected to the control device; the support device is located on one side of the impact head, and the support device is used to install the device to be tested; the control device is used to control the drive assembly so that the drive assembly drives the impact head to apply forces on the device to be tested from different directions according to the set frequency of the impact force and the magnitude of the impact force. Since the set frequency of the impact force and the magnitude of the impact force can be set according to the actual use environment of the device to be tested, the test conditions provided by the stress fatigue test system are closer to the actual use environment of the device to be tested, so that the accuracy of the test results of the wind load bearing capacity of the device to be tested is higher. The impact head can apply forces on the device to be tested along different loading directions, so that the forces borne by the device to be tested are closer to the actual use environment, so as to further improve the accuracy of the test results of the wind load bearing capacity of the device to be tested.

[0008] In one possible implementation, the stress fatigue testing system provided in the embodiment of the present application has a plurality of impact devices, and the plurality of impact devices are arranged at circumferential intervals along the supporting device to apply impact forces on the device to be tested in multiple directions, so that the impact forces borne by the device to be tested are closer to the actual use environment, thereby further improving the accuracy of the test results of the wind load bearing capacity of the device to be tested.

[0009] In a possible implementation, in the stress fatigue testing system provided in the embodiment of the present application, the number of impact devices is two, and the two impact devices are arranged opposite to each other on two sides of the supporting device.

[0010] In a possible implementation, in the stress fatigue testing system provided in the embodiment of the present application, a plurality of impact force frequencies are arranged in the control device, each impact device corresponds to a frequency of impact force, and the impact head of each impact device can apply impact force on the device to be tested from different directions according to the corresponding frequency of impact force, and the frequency of impact force of each impact head can be set separately, so that the fatigue stress testing system has a wider applicability.

[0011] In a possible implementation, the stress fatigue testing system provided by the embodiment of the present application has one impact device, and the supporting device includes a first drive motor, a turntable and a mounting portion connected in sequence; the control device is electrically connected to the first drive motor; the mounting portion is used to install the device to be tested; the control device is used to control the rotation of the first drive motor, thereby driving the mounting portion to rotate through the turntable to change the direction of the impact force applied by the impact device on the device to be tested. Thus, the impact head in the impact device applies forces to different parts of the device to be tested, which is equivalent to the impact head applying forces to the device to be tested along different loading directions, so that the force borne by the device to be tested is closer to the actual use environment, which can further improve the accuracy of the test results of the wind load bearing capacity of the device to be tested. In addition, by providing an impact device and allowing the supporting device to rotate relative to the impact device, the space occupied by the stress fatigue testing system can be reduced.

[0012] In a possible implementation, in the stress fatigue testing system provided in the embodiment of the present application, a first rotation frequency is set in the control device, and the control device is used to control the rotation of the first drive motor according to the first rotation frequency.

[0013] In a possible implementation, the stress fatigue test system provided by the embodiment of the present application, the control device includes a controller and a force sensor, the force sensor is arranged at the end of the impact head, the force sensor is electrically connected to the controller, and the force sensor is used to detect the impact force applied by the impact head to the device to be tested; the impact device also includes a compensation component, the compensation component is connected between the drive component and the impact head, and the compensation component is electrically connected to the controller; when the force sensor detects that the impact force applied by the impact head to the device to be tested is less than or equal to the first threshold, the controller controls the length of the compensation component to increase to increase the spacing between the impact head and the drive component; and / or, when the force sensor detects that the impact force applied by the impact head to the device to be tested is greater than or equal to the second threshold, the controller controls the length of the compensation component to decrease to reduce the spacing between the impact head and the drive component. The controller compares the actual force loaded on the device to be tested by the force sensor with the set force. When the actual force carried by the device to be tested is different from the pre-stored force in the controller, the controller adjusts the length of the compensation component to change the spacing between the impact head and the drive component, thereby, the force applied by the impact head on the device to be tested can be changed within the length variation range of the compensation component to further improve the accuracy of the test results.

[0014] In a possible implementation, the stress fatigue testing system provided by the embodiment of the present application, the compensation component includes a second drive motor, a first screw, a turbine, a second screw and a transfer tube; the second drive motor, the first screw, the turbine and the second screw are transmission-connected; the transfer tube is threadedly connected to the second screw, and the transfer tube and the second screw are connected between the impact head and the drive component along the direction of the impact force; the controller is electrically connected to the second drive motor, and the controller is used to control the rotation of the second drive motor so that the second drive motor drives the second screw to move relative to the transfer tube along the direction of the impact force through the first screw and the turbine. Through the turbine screw transmission assembly, the spacing between the drive assembly and the impact head can be accurately controlled, thereby adjusting the force applied by the impact head on the device to be tested, so that the force applied by the impact head on the device to be tested is equal to the preset force, thereby further improving the accuracy of the test results of the wind load bearing capacity of the device to be tested.

[0015] In a possible implementation, the stress fatigue testing system provided in the embodiment of the present application, the impact device further includes a loading rope, the loading rope is connected to the impact head, and the loading rope is used to be sleeved on the device to be tested to apply tension on the device to be tested. The loading rope is used to be sleeved on the device to be tested so that the surface of the device to be tested is subjected to a more uniform force.

[0016] In a possible implementation, the stress fatigue testing system provided in the embodiment of the present application, the control device also includes a counting switch, the controller and the drive assembly are electrically connected to the counting switch, and a set loading number is set in the controller. When the counting switch detects that the loading number of the impact device is equal to the set loading number, the controller controls the impact device to stop applying force on the device to be tested. The counting switch transmits the detected loading number to the controller, and the controller compares the loading number detected by the counting switch with the set loading number. When the loading number detected by the counting switch is equal to the set loading number, the controller controls the third drive motor to stop moving, so that the impact head stops applying force on the device to be tested. In this way, the entire test process can be unattended.

[0017] These and other aspects, implementation forms and advantages of the exemplary embodiments will become apparent from the embodiments described below in conjunction with the accompanying drawings. However, it should be understood that the description and drawings are for illustration only and are not intended to be limiting of the present application, as described in the accompanying claims. Other aspects and advantages of the present application will be described in the following description, and some will be apparent from the description or learned through the practice of the present application. In addition, various aspects and advantages of the present application can be realized and obtained by the means and combinations specifically pointed out in the attached claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A first structural schematic diagram of a stress fatigue testing system provided in an embodiment of the present application;

[0019] Figure 2 A usage state diagram of the stress fatigue testing system provided in an embodiment of the present application;

[0020] Figure 3 A second structural schematic diagram of the stress fatigue testing system provided in an embodiment of the present application;

[0021] Figure 4 A third structural schematic diagram of the stress fatigue testing system provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the working process of the compensation component in the stress fatigue testing system provided in an embodiment of the present application;

[0023] Figure 6 A first structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application;

[0024] Figure 7 for Figure 6 Side view at mid-AA;

[0025] Figure 8 A second structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application;

[0026] Fig. 9 A third structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application;

[0027] Fig.10 for Fig. 9 The enlarged view of point B in the middle;

[0028] Fig.11 A fourth structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100. Stress fatigue test system;

[0031] 110. Control device;

[0032] 111. Controller;

[0033] 112. Force sensor;

[0034] 113. Counting switch;

[0035] 114. Buzzer alarm;

[0036] 115. Display;

[0037] 120, impact device; 120a, first impact device; 120b, second impact device;

[0038] 121, impact platform; 121a, first impact platform; 121b, first impact platform;

[0039] 122, driving assembly; 122a, first driving assembly; 122b, second driving assembly;

[0040] 1221, third driving motor; 1222, swing arm; 1223, connecting rod; 1224, supporting rod; 1224a, first supporting section; 1224b, second supporting section;

[0041] 123, impact head; 123a, first impact head; 123b, second impact head; 1231, threaded hole; 1232, loading rope; 1233, transfer rod; 1233a, mounting hole; 1234, retaining spring;

[0042] 124, compensation assembly; 1241, second drive motor; 1242, first screw rod; 1243, turbine; 1244, second screw rod; 1245, transfer tube;

[0043] 130. Support device;

[0044] 131. A first driving motor;

[0045] 132. Turntable;

[0046] 133. Installation department;

[0047] 200. Equipment to be tested;

[0048] L1, first threshold;

[0049] L2, second threshold;

[0050] L3, third threshold;

[0051] L4, fourth threshold;

[0052] X, loading direction;

[0053] X1, first loading direction;

[0054] X2, second loading direction. DETAILED DESCRIPTION

[0055] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0056] With the rapid development of communication technology, more and more communication equipment such as wireless base stations and edge servers are installed outdoors.

[0057] Outdoor communication equipment can be installed on the outside of a building or on the ground through a mounting bracket. These outdoor communication equipment are subjected to loads from wind forces in multiple directions for a long time (the loads from wind forces are referred to as wind loads for short). Therefore, outdoor communication equipment needs to undergo a wind load fatigue strength simulation test to test the fatigue damage of the connection between the outdoor communication equipment and the mounting bracket after long-term exposure to wind loads in multiple directions, and to judge the wind load bearing capacity of the outdoor communication equipment based on the fatigue damage. Among them, fatigue strength refers to the maximum stress that a material can withstand without causing damage under multiple alternating loads, and fatigue strength is also called fatigue limit.

[0058] In the related art, the wind load bearing capacity of outdoor communication equipment can be tested by repeatedly applying impact force to the outdoor communication equipment. However, the test equipment in the related art only applies impact force to the outdoor communication equipment in one direction, and the outdoor wind direction is non-directional. Therefore, the impact force applied by the test equipment in the related art deviates greatly from the wind load actually borne by the outdoor communication equipment. The fatigue strength of the outdoor communication equipment caused by the impact force deviates greatly from the fatigue strength when it is actually installed outdoors, making the accuracy of the wind load bearing capacity test result low.

[0059] In addition, in the related art, after the outdoor communication equipment is subjected to a certain number of impacts, it may be deformed, and the impact force applied by the test equipment on the outdoor communication equipment may increase or decrease, so that the impact force generated by the test equipment does not meet the impact force that the outdoor communication equipment actually needs to bear, further reducing the accuracy of the test results of the wind load bearing capacity.

[0060] Based on this, an embodiment of the present application provides a stress fatigue testing system that can improve the accuracy of the test results of the wind load bearing capacity of outdoor communication equipment.

[0061] Figure 1 A first structural schematic diagram of a stress fatigue testing system provided in an embodiment of the present application; Figure 2 A usage status diagram of the stress fatigue testing system provided in an embodiment of the present application.

[0062] See also Figure 1 and Figure 2As shown, the stress fatigue testing system 100 provided in the embodiment of the present application includes a control device 110, at least one impact device 120 and a supporting device 130; the impact device includes an impact table 121, a driving component 122 and an impact head 123; the impact table 121 is used to support the driving component 122 and the impact head 123, the driving component 122 is connected to at least one impact head 123, and the driving component 122 is electrically connected to the control device 110; the supporting device 130 is located on one side of the impact head 123, and the supporting device 130 is used to install the device to be tested 200; the frequency and magnitude of the impact force are set in the control device 110, and the control device 110 is used to control the driving component 122 so that the driving component 122 drives the impact head 123 to move toward the device to be tested 200, so that the impact head 123 applies force on the device to be tested 200 from different directions according to the set frequency and magnitude of the impact force.

[0063] The control device 110 may include a controller 111, which may be a PLC controller. The controller 111 is electrically connected to the drive assembly 122, and the frequency of the impact force and the magnitude of the impact force are set in the controller 111. The frequency of the impact force and the magnitude of the impact force may be set according to the stress conditions of the device to be tested 200 in the actual installation environment. It should be noted that the frequency of the impact force and the magnitude of the impact force may be stored in the control device 110 in advance, or may be input or modified through the display interface of the control device 110 after the stress fatigue test system 100 is started. The device to be tested 200 may be an outdoor communication device such as a wireless base station or an edge server, and the device to be tested 200 may also be other equipment that requires fatigue strength testing.

[0064] The impact platform 121 may be a support platform installed on the ground, and the impact platform 121 is used to support and accommodate the driving assembly 122 and the impact head 123 in the impact device 120 .

[0065] The driving assembly 122 is installed in the impact table 121 , and the driving assembly 122 can be a cylinder driving assembly or a motor driving assembly. The impact head 123 is connected to the driving assembly 122 , and the driving assembly 122 provides driving force for the impact head 123 , so as to drive the impact head 123 to move toward the supporting device 130 .

[0066] The supporting device 130 is used to install the device to be tested 200 . The specific installation method of the device to be tested 200 on the supporting device 130 needs to be the same as or similar to the installation method of the device to be tested 200 in a specific use environment.

[0067] The controller 111 can control the driving assembly 122 to drive the impact head 123 to move toward the supporting device 130, so that the impact head 123 repeatedly applies the set force on the device to be tested 200 according to the set frequency and magnitude of the impact force. The operator can observe the damage of the device to be tested 200 under the force repeatedly applied by the impact head 123, and judge the fatigue strength of the device to be tested 200 according to the damage. Since the frequency and magnitude of the impact force are set according to the actual use environment of the device to be tested 200, the test conditions provided by the stress fatigue test system 100 are closer to the actual use environment of the device to be tested, so that the test results of the wind load bearing capacity of the device to be tested 200 are more accurate.

[0068] In this embodiment, the impact head 123 can apply impact forces in different directions on the device to be tested.

[0069] Please continue to see Figure 1 As shown, in one implementation, there are multiple impact devices 120, and the multiple impact devices 120 are arranged at circumferential intervals along the supporting device 130 to apply impact forces on the device to be tested 200 along multiple loading directions X, so that the impact forces borne by the device to be tested 200 are closer to the actual use environment, thereby further improving the accuracy of the test results of the wind load bearing capacity of the device to be tested 200.

[0070] exist Figure 1 and Figure 2 In the illustrated embodiment, two impact devices 120 are schematically shown, and the two impact devices 120 are respectively a first impact device 120a and a second impact device 120b. The first impact device 120a and the second impact device 120b are arranged on opposite sides of the support device 130, and the impact heads 123 in the two impact devices 120 can apply forces on the device to be tested 200 along two relative loading directions X. The two relative loading directions X are respectively a first loading direction X1 and a second loading direction X2.

[0071] Please continue to see Figure 1 and Figure 2 As shown, the control device 110 is provided with a plurality of impact force frequencies, each impact device 120 corresponds to a frequency of impact force, and the impact head 123 of each impact device 120 can apply impact force to the device to be tested 200 from different directions according to the corresponding frequency of impact force.

[0072] The stress fatigue testing system 100 includes two impact devices 120. The first impact device 120a includes a first impact table 121a, a first drive assembly 122a and a first impact head 123a; the second impact device 120b includes a second impact table 121b, a second drive assembly 122b and a second impact head 123b.

[0073] exist Figure 1 and Figure 2 In the illustrated embodiment, the controller 111 of the control device 110 is provided with a first loading frequency and a second loading frequency, and the first loading frequency and the second loading frequency may be the same or different. The controller 111 controls the first driving component 122a to operate according to the first loading frequency, so that the first impact head 123a applies a force on the device to be tested 200 along the first loading direction X1 according to the first loading frequency. The controller 111 controls the second driving component 122b to operate according to the second loading frequency, so that the second impact head 123b applies a force on the device to be tested 200 along the second loading direction X2 according to the second loading frequency, and so on and so forth, so as to perform a stress fatigue test on the device to be tested 200. It should be noted that after the first driving component 122a has applied the force, it may wait for a period of time until the device to be tested 200 is restored, and then the second driving component 122b can start to apply the force, so as to improve the accuracy of the test result.

[0074] Figure 3 A second structural schematic diagram of the stress fatigue testing system provided in an embodiment of the present application.

[0075] See also Figure 3 As shown, the number of impact devices 120 is one, and the supporting device 130 includes a first driving motor 131, a turntable 132 and a mounting portion 133 connected in sequence; the control device 110 is electrically connected to the first driving motor 131; the mounting portion 133 is used to mount the device to be tested 200, and the control device 110 is used to control the rotation of the first driving motor 131, thereby driving the mounting portion 133 to rotate through the turntable 132, so as to change the direction of the impact force applied by the impact device 120 on the device to be tested 200.

[0076] The device to be tested 200 can be mounted on the mounting portion 133 by means of a fastener 134 . The rotating shaft of the first driving motor 131 is connected to the rotating disk 132 .

[0077] The controller 111 is electrically connected to the first drive motor 131. The controller 111 controls the first drive motor 131 to rotate. The first drive motor 131 drives the mounting portion 133 to rotate through the turntable 132, thereby making different parts of the device to be tested 200 installed on the mounting portion 133 face the impact device 120. As a result, the impact head 123 in the impact device 120 applies forces to different parts of the device to be tested 200, which is equivalent to the impact head 123 applying forces on the device to be tested along different loading directions X, so that the force borne on the device to be tested 200 is closer to the actual use environment, which can further improve the accuracy of the test results of the wind load bearing capacity of the device to be tested 200.

[0078] In addition, by providing an impact device 120 and allowing the support device 130 to rotate relative to the impact device 120 , the space occupied by the stress fatigue testing system 100 can be reduced.

[0079] exist Figure 3 In the illustrated embodiment, a first rotation frequency is set in the controller 111 of the control device 110 , and the controller 111 controls the first driving motor 131 to rotate according to the first rotation frequency, so as to drive the mounting portion 133 to rotate according to the first rotation frequency through the turntable 132 .

[0080] It is understandable that the frequency of the impact force may be different from the first rotation frequency, so during the period when the mounting portion 133 is in a stopped state while rotating at the first rotation frequency, the impact head 123 in the impact device 120 may apply a force on the device to be tested 200 at the frequency of the impact force, and after the impact head 123 has applied a force on the device to be tested 200 at the frequency of the impact force, the mounting portion 133 continues to rotate at the first rotation frequency, and the cycle is repeated in sequence, so that the force can be applied to different parts of the device to be tested 200. The first rotation frequency may be stored in the control device 110 in advance, or may be input or modified through the display interface of the control device 110 after the stress fatigue test system 100 is started.

[0081] The stress fatigue testing system 100 provided in the embodiment of the present application is provided with a control device 110, an impact device 120 and a support device 130; the impact device includes an impact table 121, a drive component 122 and an impact head 123; the impact table 121 is used to support the drive component 122 and the impact head 123, the drive component 122 is connected to the impact head 123, and the drive component 122 is electrically connected to the control device 110; the support device 130 is located on one side of the impact head 123, and the support device 130 is used to install the device to be tested 200; the control device 110 is used to control the drive component 122, so that the drive component 122 drives the impact head 123 to apply forces on the device to be tested 200 from different directions according to the set frequency and magnitude of the impact force. Since the set frequency and magnitude of the impact force can be set according to the actual use environment of the device to be tested 200, the test conditions provided by the stress fatigue testing system 100 are closer to the actual use environment of the device to be tested, so that the test results of the wind load bearing capacity of the device to be tested 200 are more accurate. The impact head 123 can apply forces on the device to be tested 200 along different loading directions X, so that the forces borne by the device to be tested 200 are closer to the actual use environment, so as to further improve the accuracy of the test results of the wind load bearing capacity of the device to be tested 200.

[0082] When the stress fatigue testing system 100 is used to test the wind load bearing capacity of the device to be tested 200, after the device to be tested 200 is subjected to the force repeatedly applied by the impact head 123, the device to be tested 200 may be slightly deformed. Therefore, the force actually borne by the device to be tested 200 may be greater than or less than the force applied by the impact head 123, so that the force actually borne by the device to be tested 200 does not meet the experimental requirements, thereby affecting the accuracy of the test results.

[0083] In a possible implementation manner of the present invention, the accuracy of the test result can be improved by setting a compensation component 124 .

[0084] Figure 4 A third structural schematic diagram of the stress fatigue testing system provided in an embodiment of the present application.

[0085] See also Figure 4 As shown, the control device 110 also includes a force sensor 112, which is arranged at the end of the impact head 123, and the force sensor 112 is electrically connected to the controller 111. The force sensor 112 is used to detect the impact force applied by the impact head 123 to the device to be tested 200; the impact device 120 also includes a compensation component 124, which is connected between the driving component 122 and the impact head 123, and the compensation component 124 is electrically connected to the controller 111.

[0086] The force sensor 112 can be electrically connected to the controller 111 via a cable. When the impact head 123 applies force to the device to be tested 200 , the force sensor 112 is used to detect the actual force applied by the impact head 123 on the device to be tested 200 , and convert the force signal into an electrical signal to transmit to the controller 111 .

[0087] The controller 111 compares the force actually loaded on the device to be tested 200 by the force sensor 112 with the set force. When the force actually borne by the device to be tested 200 is different from the pre-stored force in the controller 111, the controller 111 adjusts the length of the compensation component 124 to change the spacing between the impact head 123 and the drive component 122. Thus, the force applied by the impact head 123 on the device to be tested 200 can be changed within the length variation range of the compensation component 124 to further improve the accuracy of the test results.

[0088] Specifically, Figure 5 A schematic diagram of the working process of the compensation component in the stress fatigue testing system provided in an embodiment of the present application.

[0089] exist Figure 5 In the figure, the horizontal axis is used to indicate the number of times the impact head 123 loads on the device to be tested 200, and the vertical axis is used to indicate the magnitude of the impact force applied by the impact head 123 to the device to be tested 200 each time. The first threshold is represented by L1, the second threshold is represented by L2, and the area between the first threshold L1 and the second threshold L2 indicates the magnitude of the set force. When the force applied by the impact head 123 on the device to be tested 200 is within the range defined by the first threshold L1 and the second threshold L2, it indicates that the force applied by the impact head 123 on the device to be tested 200 is equal to the set force. At this time, the impact force of the impact head 123 on the device to be tested 200 meets the test requirements.

[0090] When the force sensor 112 detects that the force applied by the impact head 123 on the device to be tested 200 is less than or equal to the first threshold value L1, the controller 111 controls to increase the length of the compensation component 124 to increase the distance between the impact head 123 and the driving component 122, thereby increasing the impact force applied by the impact head 123 on the device to be tested 200 to within the range of the first threshold value L1 and the second threshold value L2.

[0091] When the force sensor 112 detects that the force applied by the impact head 123 on the device to be tested 200 is greater than or equal to the second threshold value L2, the controller 111 controls the reduction of the length of the compensation component 124 to reduce the distance between the impact head 123 and the driving component 122, thereby reducing the impact force applied by the impact head 123 on the device to be tested 200 to within the range of the first threshold value L1 and the second threshold value L2.

[0092] The compensation component 124 may be a worm screw transmission component. The specific structure of the compensation component 124 is described below.

[0093] Figure 6 A first structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application; Figure 7 for Figure 6 Side view at AA.

[0094] See also Figure 6 and Figure 7 As shown, the compensation component 124 includes a second drive motor 1241, a first screw rod 1242, a turbine 1243, a second screw rod 1244 and a transfer tube 1245; the second drive motor 1241, the first screw rod 1242, the turbine 1243 and the second screw rod 1244 are transmission connected; the transfer tube 1245 is threadedly connected to the second screw rod 1244, and the transfer tube 1245 and the second screw rod 1244 are connected between the impact head 123 and the drive component 122 along the loading direction X; the controller 111 is electrically connected to the second drive motor 1241, and the controller 111 is used to control the rotation of the second drive motor 1241, so that the second drive motor 1241 drives the second screw rod 1244 to move relative to the transfer tube 1245 along the loading direction X through the first screw rod 1242 and the turbine 1243.

[0095] Please continue to see Figure 6 As shown, the drive assembly 122, the transfer tube 1245, the second screw rod 1244 and the impact head 123 are connected in sequence along the loading direction X, wherein the transfer tube 1245 is threadedly connected to the second screw rod 1244. Specifically, the transfer tube 1245 has a receiving portion at one end facing the second screw rod 1244, the inner wall of the receiving portion has an internal thread, the outer surface of the second screw rod 1244 has an external thread, and the end of the second screw rod 1244 is inserted in the receiving portion so that the second screw rod 1244 is threadedly connected to the transfer tube 1245. When the second screw rod 1244 moves along the loading direction X, the transfer tube 1245 can support the second screw rod 1244. When the second screw rod 1244 moves along the loading direction X, the distance between the drive assembly 122 and the impact head 123 can be increased, thereby increasing the force applied by the impact head 123 on the device to be tested 200. When the second screw rod 1244 moves away from the loading direction X, the distance between the driving assembly 122 and the impact head 123 can be reduced, thereby reducing the force exerted by the impact head 123 on the device to be tested 200. The power for the movement of the second screw rod 1244 is provided by the shaft of the second driving motor 1241, the first screw rod 1242 and the turbine 1243.

[0096] For details, please refer to Figure 7As shown, the shaft of the second drive motor 1241, the first screw rod 1242 and the axis of the turbine 1243 are coaxially connected. The second screw rod 1244 extends along the loading direction X, and the extension direction of the first screw rod 1242 and the extension direction of the second screw rod 1244 (loading direction X) have an angle. Figure 6 and Figure 7 In the illustrated embodiment, the extension direction of the first screw rod 1242 is perpendicular to the extension direction (loading direction X) of the second screw rod 1244. The second screw rod 1244 is meshed with the turbine 1243. When the shaft of the second drive motor 1241 rotates, the turbine 1243 can be driven to rotate through the first screw rod 1242 to drive the second screw rod 1244 to move.

[0097] The second driving motor 1241 is also electrically connected to the controller 111 , and the movement of the second driving motor 1241 is controlled by the controller 111 .

[0098] For example, when the force sensor 112 detects that the force applied by the impact head 123 on the device to be tested 200 is less than the set force, the controller 111 controls the second drive motor 1241 to rotate forward to move the second screw rod 1244 along the loading direction X, thereby increasing the distance between the drive assembly 122 and the impact head 123, thereby increasing the force applied by the impact head 123 on the device to be tested 200.

[0099] When the force sensor 112 detects that the force applied by the impact head 123 on the device to be tested 200 is greater than the set force, the controller 111 controls the second drive motor 1241 to reverse so that the second screw rod 1244 moves away from the loading direction X, thereby reducing the distance between the drive assembly 122 and the impact head 123, thereby reducing the force applied by the impact head 123 on the device to be tested 200.

[0100] The controller 111 determines the specific number of rotations of the second drive motor 1241 according to the difference between the set force and the actual force fed back by the force sensor 112 , thereby determining the movement amount of the second screw rod 1244 .

[0101] Through the turbine screw transmission assembly, the distance between the drive assembly 122 and the impact head 123 can be accurately controlled, thereby adjusting the force applied by the impact head 123 to the device to be tested 200, so that the force applied by the impact head 123 to the device to be tested 200 is equal to the preset force, thereby further improving the accuracy of the test results of the wind load bearing capacity of the device to be tested 200.

[0102] Next, the specific structure of the driving assembly 122 is described.

[0103] Figure 8A second structural schematic diagram of the impact device and the control device in the stress fatigue testing system provided in an embodiment of the present application.

[0104] See also Figure 8 As shown, the driving assembly 122 includes a third driving motor 1221, a swing arm 1222, a connecting rod 1223 and a support rod 1224 connected in sequence, the third driving motor 1221 is electrically connected to the controller 111, and the support rod 1224 is connected to the compensation assembly 124; the controller 111 controls the rotation of the third driving motor 1221, and the swing arm 1222 and the connecting rod 1223 convert the rotation of the third driving motor 1221 into the movement of the support rod 1224 along the loading direction X.

[0105] Specifically, the third drive motor 1221, the swing arm 1222, the connecting rod 1223 and the support rod 1224 can all be installed on the impact table 121, the rotation axis of the third drive motor 1221 is connected to the swing arm 1222, the swing arm 1222, the connecting rod 1223 and the support rod 1224 are hinged in sequence, the controller 111 controls the third drive motor 1221 to rotate, the third drive motor 1221 drives the swing arm 1222 to rotate around its rotation axis, and transmits the rotation of the third drive motor 1221 to the support rod 1224 through the swing arm 1222 and the connecting rod 1223. When the third drive motor 1221 rotates forward, the support rod 1224 moves along the loading direction X to apply an impact force on the device to be tested 200 through the impact head 123, and when the third drive motor 1221 rotates reversely, the support rod 1224 moves away from the loading direction X, thereby repeatedly applying a force on the device to be tested 200.

[0106] The set force applied by the impact head 123 on the device to be tested 200 is determined by the length of the support rod 1224 .

[0107] Please continue to participate Figure 8 As shown, the support rod 1224 includes a first support segment 1224a and a second support segment 1224b, the first support segment 1224a is threadedly connected to the second support segment 1224b, the first support segment 1224a is connected to the connecting rod 1223, and the second support segment 1224b is connected to the compensation component 124, and the second support segment 1224b can move along the loading direction X relative to the first support segment 1224a to increase or decrease the length of the support rod 1224 along the loading direction X, thereby increasing or decreasing the set force applied by the impact head 123 to the device to be tested 200.

[0108] In this embodiment, one end of the first support segment 1224a is hinged to the connecting rod 1223, the other end of the first support segment 1224a has an external thread, the second support segment 1224b has an internal thread, and the first support segment 1224a is screwed into the second support segment 1224b. The end of the second support segment 1224b facing away from the first support segment 1224a is connected to the transfer tube 1245 in the compensation component 124.

[0109] During the test, the length of the support rod 1224 is determined according to the required bearing force in the actual use environment of the device to be tested 200. When the length of the support rod 1224 is short, the second support section 1224b is screwed out relative to the first support section 1224a, thereby increasing the length of the support rod 1224 to increase the impact force applied by the impact head 123 to the device to be tested 200. When the length of the support rod 1224 is long, the second support section 1224b is screwed in relative to the first support section 1224a, thereby reducing the length of the support rod 1224 to reduce the impact force applied by the impact head 123 to the device to be tested 200.

[0110] In this embodiment, the impact head 123 is connected to the driving assembly 122 via the second screw rod 1244 , and the driving assembly 122 drives the impact head 123 to move toward the device to be tested 200 along the loading direction X, so that the impact head 123 applies an impact force on the device to be tested 200 .

[0111] The end face of the impact head 123 is usually flat. When testing, the surface of the device to be tested 200 is usually made parallel to the end face of the impact head 123. Therefore, when the impact head 123 applies impact force to the device to be tested 200, the surface of the device to be tested 200 is subjected to force more evenly.

[0112] However, for some devices under test 200 whose surfaces are not planar, the impact exerted by the impact head 123 on the devices under test 200 is uneven.

[0113] In a possible implementation, this problem can be improved by connecting a loading rope 1232 to the impact head 123 .

[0114] Specifically, Fig. 9 A third structural schematic diagram of the impact device and the control device in the stress fatigue testing system provided in an embodiment of the present application.

[0115] See also Fig. 9 As shown, the impact head 123 further includes a loading rope 1232 , which is connected to the impact head 123 . The loading rope 1232 is used to be sleeved on the device to be tested 200 to apply tension to the device to be tested 200 .

[0116] Specifically, Fig.10 for Fig. 9 Enlarged view of point B in the middle.

[0117] See also Fig.10 As shown, in this embodiment, a threaded hole 1231 may be provided on one end of the impact head 123 facing the device to be tested 200, and the impact head 123 also includes a transfer rod 1233, one end of the transfer rod 1233 is tightened in the threaded hole 1231, and the other end of the transfer rod 1233 has a mounting hole 1233a, one end of the loading rope 1232 passes through the mounting hole 1233a and is fixed by a retaining spring 1234.

[0118] The other end of the loading rope 1232 is sleeved on the device to be tested 200. When the driving assembly 122 drives the impact head 123 to move away from the loading direction X, the impact head 123 drives the loading rope 1232 to move away from the device to be tested 200, thereby applying tension to the device to be tested 200. The loading rope 1232 can fit the surface of the device to be tested 200, thereby making the tension applied by the loading rope 1232 on the device to be tested 200 more uniform.

[0119] Fig.11 A fourth structural schematic diagram of an impact device and a control device in a stress fatigue testing system provided in an embodiment of the present application.

[0120] See also Fig.11 As shown, the control device 110 also includes a counting switch 113, and the controller 111 and the driving component 122 are both electrically connected to the counting switch 113. A set number of loading times is set in the controller 111. When the counting switch 113 detects that the number of loading times of the impact device 120 is equal to the set number of loading times, the controller 111 controls the impact device 120 to stop applying force to the device to be tested 200.

[0121] Taking the impact head 123 as an example, the counting switch 113 is used to detect the actual number of times the impact head 123 is loaded on the device to be tested 200. In this embodiment, the counting switch 113 is electrically connected to the third drive motor 1221 in the drive assembly 122, and the number of times the impact head is loaded on the device to be tested 200 can be detected by detecting the number of times the third drive motor 1221 rotates forward and reverse.

[0122] The counting switch 113 transmits the detected loading times to the controller 111, and the controller 111 compares the loading times detected by the counting switch 113 with the set loading times. When the loading times detected by the counting switch 113 are equal to the set loading times, the controller 111 controls the third driving motor 1221 to stop, so that the impact head 123 stops exerting force on the device to be tested 200. In this way, the entire test process can be unattended.

[0123] Please continue to see Fig.11 As shown, the control device 110 may further include a buzzer alarm 114, which is electrically connected to the controller 111. After the controller 111 controls the third drive motor 1221 to stop, the buzzer alarm 114 emits an alarm sound to prompt the operator that the test is over.

[0124] It should be noted that the length of the compensation component 124 only changes within the length range of the transfer tube 1245. When the deformation of the device to be tested 200 is large and exceeds the length change range of the compensation component 124, the length change of the compensation component 124 cannot make the actual force equal to the preset force, the controller 111 will also control the third drive motor 1221 to stop moving. At this time, the buzzer alarm 114 emits an alarm sound.

[0125] In this embodiment, the control device 110 includes a display 115, which is also electrically connected to the controller 111. The display 115 is used to display the working process of the stress fatigue testing system 100. Figure 5 As shown, the schematic diagram of the working process of the compensation component 124 can be displayed on the display 115.

[0126] exist Figure 5 In the figure, the third threshold value L3 is the upper limit of the force that can be compensated by the compensation component 124, and the fourth threshold value L4 is the lower limit of the force that can be compensated by the compensation component 124. When the force applied by the impact head 123 on the device to be tested 200 is within the range defined by the third threshold value L3 and the fourth threshold value L4, the change of the actual force can be compensated by the compensation component 124. When the force applied by the impact head 123 on the device to be tested 200 exceeds the range defined by the third threshold value L3 and the fourth threshold value L4, the controller 111 controls the third driving motor 1221 to stop moving, and the buzzer alarm 114 emits an alarm sound.

[0127] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0128] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A stress fatigue testing system, characterized in that: It comprises a control device, at least one impact device and a supporting device; the impact device comprises an impact table, a driving assembly and an impact head; the impact table is used to support the driving assembly and the impact head, the driving assembly is connected to the impact head, and the driving assembly is electrically connected to the control device; the supporting device is located on one side of the impact head, and the supporting device is used to install the device to be tested; The control device is used to control the driving assembly so that the driving assembly drives the impact head to apply force on the device to be tested from different directions according to the set frequency and magnitude of the impact force.

2. The stress fatigue testing system according to claim 1, characterized in that: There are multiple impact devices, and the multiple impact devices are arranged at intervals along the circumference of the supporting device to apply impact forces on the device to be tested in multiple directions.

3. The stress fatigue testing system according to claim 2, characterized in that: The number of the impact devices is two, and the two impact devices are arranged opposite to each other on two sides of the supporting device.

4. The stress fatigue testing system according to claim 2, characterized in that: The control device is provided with a plurality of impact force frequencies, each of the impact devices corresponds to a frequency of the impact force, and the impact head of each of the impact devices can apply the impact force on the device to be tested from different directions according to the corresponding frequency of the impact force.

5. The stress fatigue testing system according to claim 1, characterized in that: The number of the impact device is one, the supporting device comprises a first driving motor, a rotating disk and a mounting portion connected in sequence; the control device is electrically connected to the first driving motor; the mounting portion is used to mount the device to be tested; The control device is used to control the first driving motor to rotate, thereby driving the mounting portion to rotate through the turntable to change the direction of the impact force applied by the impact device on the device to be tested.

6. The stress fatigue testing system according to claim 5, characterized in that: The control device is provided with a first rotation frequency, and the control device is used to control the first driving motor to rotate according to the first rotation frequency.

7. The stress fatigue testing system according to any one of claims 1 to 6, characterized in that: The control device includes a controller and a force sensor, wherein the force sensor is arranged at the end of the impact head, the force sensor is electrically connected to the controller, and the force sensor is used to detect the impact force applied by the impact head on the device to be tested; the impact device also includes a compensation component, the compensation component is connected between the driving component and the impact head, and the compensation component is electrically connected to the controller; When the force sensor detects that the impact force applied by the impact head on the device to be tested is less than or equal to a first threshold, the controller controls the length of the compensation component to increase so as to increase the spacing between the impact head and the driving component; and / or When the force sensor detects that the impact force applied by the impact head on the device to be tested is greater than or equal to a second threshold, the controller controls the length of the compensation assembly to decrease so as to reduce the distance between the impact head and the driving assembly.

8. The stress fatigue testing system according to claim 7, characterized in that: The compensation assembly includes a second drive motor, a first screw rod, a turbine, a second screw rod and a transfer tube; The second drive motor, the first screw rod, the turbine and the second screw rod are in driving connection; the adapter tube is threadedly connected to the second screw rod, and the adapter tube and the second screw rod are connected between the impact head and the drive assembly along the direction of the impact force; The controller is electrically connected to the second drive motor, and is used to control the rotation of the second drive motor so that the second drive motor drives the second screw rod to move relative to the transfer tube along the direction of the impact force through the first screw rod and the turbine.

9. The stress fatigue testing system according to any one of claims 1 to 8, characterized in that: The impact device also includes a loading rope, which is connected to the impact head and is used to be sleeved on the device to be tested to apply tension to the device to be tested.

10. The stress fatigue testing system according to claim 7, characterized in that: The control device also includes a counting switch, and the controller and the drive assembly are both electrically connected to the counting switch. A set number of loading times is set in the controller. When the counting switch detects that the number of loading times of the impact device is equal to the set number of loading times, the controller controls the impact device to stop applying force to the device to be tested.

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