Fatigue reciprocating device for pressure test of test piece and analysis method

Abstract

The invention relates to the technical field of test equipment, and particularly discloses a fatigue reciprocating device for a pressure test of a test piece and an analysis method. Comprising a cabinet body, a turnover mechanism, a measuring mechanism and a driving part, and the cabinet body comprises a control cabinet and an integrally-arranged mounting cabinet; the turnover mechanism is composed of a fixed seat and a turnover seat capable of rotating based on the fixed seat, and a driving part is arranged at the bottom of the turnover seat; the measuring mechanism comprises a measuring host and at least one pressure sensor in telecommunication connection with the measuring host. A pressure sensor is arranged between the first mounting plate and the second mounting plate at the top of the fixed seat, and test piece mounting positions are arranged at the tops of the first mounting plate and the turnover seat. The stepless adjustment of the overturning angle and speed can be realized by adjusting related parts of the driving part, and the test requirements of various special equipment are met; the pressure sensor is adopted for impact, accurate pressure measurement is ensured, and actual data can be directly obtained without conversion; manual and automatic modes are provided, and the change of a test piece can be observed from multiple angles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test equipment, in particular to a fatigue reciprocating device for pressure testing of test pieces and an analysis method. BACKGROUND

[0002] In the research and development and production process of special equipment, fatigue reciprocating test of test pieces under pressure is a key link to evaluate their performance and reliability. At present, the existing technology has many problems in this regard.

[0003] On the one hand, there are many types of special equipment, and the flip angle requirements of different equipment are very different. For example, in the welding and assembly of automobile seat frames, the traditional flip mechanism is difficult to meet the specific flip requirements due to the large size, heavy weight and complex shape of the seat frame. In the actual production scene under the background of this patent, in order to meet the test needs of such special equipment in the past, it is often necessary to manufacture sample pieces separately for each test, which undoubtedly leads to high manufacturing cost. Moreover, the process of manufacturing sample pieces separately is tedious and requires a lot of time and manpower, making the test efficiency very low.

[0004] On the other hand, in the aspect of pressure testing, the existing technology also has defects. When some traditional test devices test test pieces under pressure, the installation position and method of the pressure sensor are not reasonable, and they are easily affected by the impact generated during the test process, resulting in large fluctuations in instrument readings and making it difficult to accurately measure the pressure borne by the test piece. Moreover, the traditional method cannot directly observe the change of the down pressure of the test piece on the active part of the special equipment at any angle, and the actual down pressure data can only be obtained after complex conversion, which not only increases the complexity of the test, but also may introduce more errors, reducing the accuracy and reliability of the test data.

[0005] The existing technology has many technical problems such as high cost, low efficiency and inaccurate pressure measurement due to the variety of special equipment, the need to manufacture sample pieces separately for each test, and the deficiencies in the pressure testing process, and an innovative technical solution is urgently needed to solve these problems. SUMMARY

[0006] Therefore, the embodiments of the present application provide a fatigue reciprocating device for pressure testing of test pieces to solve the technical problems of high cost and low efficiency caused by the variety of special equipment and the need to manufacture sample pieces separately for each test in the prior art.

[0007] In a first aspect, the embodiments of the present application provide a fatigue reciprocating device for pressure testing of test pieces, comprising: a cabinet body including a control cabinet and a mounting cabinet integrally arranged with the control cabinet; a turnover mechanism including a fixed seat arranged on the top of the control cabinet and a turnover seat capable of rotating based on the fixed seat, the bottom of the turnover seat being further provided with a driving part; a measuring mechanism including a measuring host and at least one pressure sensor in signal connection with the measuring host; the top of the fixed seat is provided with a first mounting plate and a second mounting plate, the pressure sensor is arranged between the first mounting plate and the second mounting plate, and the first mounting plate and the top of the turnover seat are provided with a mounting position of test pieces.

[0008] Preferably, the driving part is arranged as a driving cylinder driven by an air compressor; the bottom of the driving cylinder is fixedly connected with the top of the mounting cabinet, and the piston rod of the driving cylinder is hinged to the bottom of the turnover seat to drive the turnover seat to perform a turnover action.

[0009] Preferably, the control cabinet is provided with a control system, the control system is provided with a knob for controlling the gas flow of the air compressor to adjust the gas flow; the control system is further provided with a first magnetic inductor and a second magnetic inductor in signal connection, the first magnetic inductor and the second magnetic inductor are respectively arranged at both ends of the driving cylinder body and are used to detect the extension amount of the piston rod to control the turnover angle of the turnover seat.

[0010] Preferably, the fixed seat includes a fixed plate and a connecting arm arranged on the fixed plate, the connecting arm includes a first connecting arm and a second connecting arm arranged on both sides of the fixed plate.

[0011] Preferably, the top of the fixed plate is further provided with a first reinforcing plate and a second reinforcing plate on both sides respectively; the first connecting arm and the second connecting arm are respectively arranged at one end of the first reinforcing plate and the second reinforcing plate and are integrally arranged with the first reinforcing plate and the second reinforcing plate; the first mounting plate is arranged at the top of the first connecting arm, the second connecting arm, the first reinforcing plate and the second reinforcing plate and is fixedly connected with the first connecting arm, the second connecting arm, the first reinforcing plate and the second reinforcing plate.

[0012] Preferably, the turnover seat includes a seat body and a first hinged arm and a second hinged arm arranged on both sides of the seat body; the first hinged arm and the second hinged arm are respectively hinged to the first connecting arm and the second connecting arm to realize the turnover movement of the turnover seat based on the fixed seat.

[0013] Preferably, the top of the first and second articulated arms is further provided with a reinforcing part, the reinforcing part comprising a first set of ribs and a second set of ribs; the top of the first and second set of ribs is provided with a fixing mechanism for fixing the test piece.

[0014] Preferably, the measuring mechanism comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor in electrical communication with the measuring host; the first, second, third and fourth pressure sensors are respectively arranged at the four corners between the first and second mounting plates.

[0015] In a second aspect, a fatigue reciprocating analysis method for a test piece under pressure test is provided, which is applied to the fatigue reciprocating device for a test piece under pressure test, and comprises:

[0016] After the test device starts operation, test pressure data is obtained;

[0017] The test pressure data is matched with the standard values of the first, second, third and fourth pressure sensors in the same test environment, respectively;

[0018] If the test pressure data fails to match the standard values of at least one sensor, the test pressure data is judged as invalid and is rejected;

[0019] If the test pressure data successfully matches the standard values of at least one sensor, the test pressure data is cross-validated according to the correlation model;

[0020] Based on the cross-validation result of the test pressure data according to the correlation model, it is determined whether the test piece is qualified or not according to a preset standard.

[0021] Preferably, the establishment of the correlation model comprises:

[0022] The real-time turning angle of the turning seat detected by the first and second magnetic inductors is obtained;

[0023] The pressure data corresponding to the turning angle synchronously collected by the first, second, third and fourth pressure sensors is obtained;

[0024] The average pressure value at the same turning angle is calculated, and an "angle-average pressure" curve is drawn;

[0025] The reciprocating frequency of the driving part is obtained, the pressure attenuation rate corresponding to different reciprocating frequencies is calculated, and a pressure attenuation rate curve is drawn;

[0026] The "angle-average pressure" curve is integrated with a pressure decay rate curve with the turning angle as the correlation axis to form a correlation model.

[0027] The fatigue reciprocating device for pressure testing of test pieces and the analysis method have the following beneficial effects:

[0028] In the fatigue reciprocating device for pressure testing of test pieces, the structure with a freely adjustable turning angle (adjusted by a magnetic induction switch position) can adapt to the turning angle requirements of most special equipment, without the need to manufacture sample pieces for different equipment, thereby greatly reducing the manufacturing cost and improving the testing efficiency; meanwhile, the special equipment numerical model movable part is set as the device fixed end, and the fixed part is set as the movable end, so that the impact on the pressure sensor is eliminated, the pressure measurement is more accurate, and the actual pressure data of the test piece at any angle can be directly obtained without conversion; in addition, the device has manual and automatic modes, and the stepless speed regulation of the air cylinder is realized by cooperating with the gas flow knob, so that diversified testing requirements can be met, the changes of the test piece can be observed at multiple angles, the fatigue reciprocating test can be efficiently completed and data can be recorded, and the convenience, accuracy and applicability of the test are improved as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows, and for those skilled in the art, other drawings can also be obtained without creative labor on the premise that these drawings are within the protection scope of the present application.

[0030] Figure 1 It is a structural schematic diagram of a fatigue reciprocating device for pressure testing of test pieces;

[0031] Figure 2 It is a three-dimensional structural schematic diagram of a fatigue reciprocating device for pressure testing of test pieces;

[0032] Figure 3 It is a three-dimensional structural schematic diagram of a fatigue reciprocating device for pressure testing of test pieces from another angle;

[0033] Parts and numbers in the figure:

[0034] 100-cabinet, 110-control cabinet, 120-installation cabinet, 121-first pressure sensor, 122-second pressure sensor, 123-third pressure sensor, 124-fourth pressure sensor;

[0035] 200 - turnover mechanism, 210 - fixed seat, 211 - first reinforcing plate, 212 - second reinforcing plate, 213 - fixed plate, 214 - first connecting arm, 215 - second connecting arm, 216 - first mounting plate, 217 - second mounting plate, 220 - turnover seat, 221 - seat body, 222 - first hinged arm, 223 - second hinged arm, 230 - reinforcing part, 231 - first set of rib plates, 232 - second set of rib plates, 233 - fixing mechanism, 234 - mounting position, 235 - limiting plate;

[0036] 300 - measuring mechanism, 310 - measuring main machine;

[0037] 400 - driving part, 410 - driving cylinder, 411 - piston rod, 412 - first magnetic inductor, 413 - second magnetic inductor. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be noted that, in this document, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the processes, methods, articles or devices including the elements. If there is no conflict, the embodiments of the present application and the various features in the embodiments can be combined with each other, and are all within the protection scope of the present application.

[0039] Embodiment 1

[0040] Please see Figure 1The embodiment of the present application provides a fatigue reciprocating device 100 for pressure test of a test piece; when fatigue reciprocating test of the test piece with special equipment is carried out, due to various types of special equipment and different overturning angles, the traditional method needs to manufacture a sample piece for each test, which results in high cost and low efficiency, meanwhile, the sensor is easy to be impacted in the pressure test, reading is inaccurate, and actual data can be obtained only through complex conversion, and the device 100 can adapt to the requirements of most equipment by adjusting the overturning angle, reduce sample piece manufacturing, accurately measure pressure and directly obtain data, and has manual and automatic modes to meet diversified test.

[0041] Please refer to Figure 1 In the embodiment, the fatigue reciprocating device 100 comprises a cabinet 100 and a measuring mechanism 300; the cabinet 100 comprises a control cabinet 110 and a mounting cabinet 120 which is integrally arranged with the control cabinet 110; a turnover mechanism 200 comprises a fixed seat 210 arranged at the top of the control cabinet 110 and a turnover seat 220 which can rotate based on the fixed seat 210, and the bottom of the turnover seat 220 is further provided with a driving part 400; the measuring mechanism 300 comprises a measuring host 310 and at least one pressure sensor 121 which is in electrical signal connection with the measuring host 310; the top of the fixed seat 210 is provided with a first mounting plate 216 and a second mounting plate 217, the pressure sensor 121 is arranged between the first mounting plate 216 and the second mounting plate 217, and the first mounting plate 216 and the top of the turnover seat 220 are provided with an installation position 234 of the test piece.

[0042] Please refer to Figure 2 and Figure 3 When the test is carried out, the fixed part of the test piece is installed at the installation position 234 at the top of the turnover seat 220, the movable part (the side which needs to bear pressure) of the test piece is placed on the first mounting plate 216 of the fixed seat 210, and the test piece is ensured to be closely attached to the first mounting plate 216 and the turnover seat 220, so as to form a stress conduction chain of “turnover seat 220-test piece-first mounting plate 216-pressure sensor 121-second mounting plate 217”.

[0043] After the device is powered on, the control system in the control cabinet 110 enters a standby state, the measuring host 310 is started and establishes electrical signal connection (such as wireless signal or wired transmission) with the pressure sensor 121, the pressure sensor 121 is initialized and feeds back a reference zero point (an initial pressure value when there is no test piece) to the measuring host 310 in real time.

[0044] The driving part 400 (driving cylinder 410) pushes the overturning seat 220 to rotate around the hinge shaft of the fixed seat 210 through the telescopic action, realizing the angular overturning of the test piece. When the driving part 400 is extended, the overturning seat 220 is overturned upward, and the test piece rotates synchronously with the overturning seat 220; when the driving part 400 is shortened, the overturning seat 220 is reset downward, completing a reciprocating action. The process can be adjusted by the control cabinet 110 to adjust the operating parameters (such as speed, frequency) of the driving part 400, so as to realize the dynamic or static test of the test piece at different angles.

[0045] In the static test, the driving part 400 is adjusted to make the overturning seat 220 stay at a specific angle (such as 15°, 30°, 90°, etc.), at which the test piece remains in a static state with the overturning seat 220. The pressure sensor 121 continuously monitors the static pressure of the test piece on the first mounting plate 216 at the angle, and the measuring host 310 records the pressure value in the stable state, reflecting the load-bearing capacity or static stress characteristics (such as structural stability when maintaining a certain angle for a long time) of the test piece at the fixed angle.

[0046] Dynamic test

[0047] The control cabinet 110 controls the overturning seat 220 to reciprocally overturn at a set frequency (such as 10 times per minute) through the driving part 400, and the driving part 400 drives the overturning seat 220 to continuously rotate around the fixed seat 210, and the test piece cycles between different angles with the overturning seat 220. The pressure sensor 121 real-time captures the dynamic pressure change of the test piece on the first mounting plate 216 during the overturning process, and the measuring host 310 records the fluctuation curve of the pressure value with time, reflecting the fatigue characteristics (such as material fatigue limit, structural durability) of the test piece under repeated stress.

[0048] The pressure sensor 121 is clamped between the first mounting plate 216 and the second mounting plate 217, and the pressure of the test piece is transmitted to the pressure sensor 121 through the first mounting plate 216. When the test piece overturns with the overturning seat 220, the pressure of the test piece on the first mounting plate 216 will squeeze the pressure sensor 121, and the sensor will convert the mechanical signal into an electrical signal (such as voltage or current signal), which is transmitted to the measuring host 310 through wired or wireless mode.

[0049] The measuring host 310 processes the electrical signal (such as filtering, amplification, calibration), and finally outputs the intuitive pressure value (unit: N or kN) and change curve (time, pressure curve) on the display screen.

[0050] Specifically, the static reading can determine the load limit (such as the maximum bearing pressure) of the test piece at a fixed angle, and evaluate its static structural strength; the fluctuation range and peak value of the dynamic reading can reflect the stability of the test piece under repeated stress, and determine whether it meets the design fatigue life requirement (such as a certain part needs to withstand 100,000 times of reciprocating pressure attenuation of no more than 10%).

[0051] If the reading shows that the pressure at a certain angle is abnormal, it can be fed back to the design link for adjusting the structural parameters of the test piece or optimizing the test scheme.

[0052] Further, please refer to Figure 2 and Figure 3 , the driving part 400 is provided as a driving cylinder 410, which is driven by an air compressor; the bottom of the driving cylinder 410 is fixedly connected with the top of the installation cabinet 120, and the piston rod 411 of the driving cylinder 410 is hingedly connected with the bottom of the turnover seat 220 to drive the turnover seat 220 to perform a turnover action.

[0053] Further, the control cabinet 110 is provided with a control system, which is provided with a knob for controlling the gas flow of the air compressor to adjust the gas flow; the control system is also provided with a first magnetic inductor 412 and a second magnetic inductor 413 through telecommunication connection, the first magnetic inductor 412 and the second magnetic inductor 413 are respectively arranged at both ends of the driving cylinder 410 body, and are used to detect the extension amount of the piston rod 411 to control the turnover angle of the turnover seat 220.

[0054] Specifically, the driving part 400 adopts the driving cylinder 410 and is driven by the air compressor, which can provide stable and controllable power by compressed air, ensure the smooth turnover of the turnover seat 220, and avoid uneven stress on the test piece. Its structure is simple, convenient to maintain, and has low failure rate, and the piston rod 411 responds quickly, which can meet the demand of high-frequency fatigue test, and the hinged design can also smoothly convert linear motion into rotary motion, ensuring flexible turnover.

[0055] The gas flow knob of the control system can adjust the gas flow of the air compressor to realize stepless speed regulation of the turnover speed, which can not only adapt to the speed requirements of different test pieces, facilitate observation details or improve efficiency, but also adjust the speed according to the weight of the test piece to avoid inertial impact and ensure safety and data accuracy.

[0056] The first magnetic sensor 412 and the second magnetic sensor 413 are installed at both ends of the body of the driving cylinder 410, can accurately detect the extension amount of the piston rod 411, and further control the turning angle of the turning seat 220. The user can set the angle range by adjusting the position of the sensor, without the need of customizing a sample, thereby reducing the cost, and further realizing the automatic reciprocation of the turning action, reducing the human error, guaranteeing the consistency of the test, and laying a foundation for the accuracy of the pressure test.

[0057] Specifically, the turning speed can be steplessly adjusted by adjusting the air compressor, the extension and retraction speed of the piston rod 411 of the driving cylinder 410 can be accurately controlled by adjusting the gas flow of the air compressor, and further the turning speed of the turning seat 220 is adjusted. This design can adapt to the needs of different test pieces for the turning speed (for example, some tests need to be observed slowly for details, and some need to be quickly completed for fatigue test), and improves the versatility of the device 100. For test pieces with different weights, the speed can be adjusted to avoid impact or unstable action caused by excessive inertia, thereby guaranteeing the test safety and data accuracy.

[0058] Further, the fixed seat 210 includes a fixed plate 213 and a connecting arm arranged on the fixed plate 213, and the connecting arm includes a first connecting arm 214 and a second connecting arm 215 arranged on both sides of the fixed plate 213.

[0059] Further, the fixed plate 213 is further provided with a first reinforcing plate 211 and a second reinforcing plate 212 on both sides of the top thereof; the first connecting arm 214 and the second connecting arm 215 are respectively arranged at one end of the first reinforcing plate 211 and the second reinforcing plate 212, and are integrally arranged with the first reinforcing plate 211 and the second reinforcing plate 212; and the first mounting plate 216 is arranged on the top of the first connecting arm 214, the second connecting arm 215, the first reinforcing plate 211 and the second reinforcing plate 212, and is fixedly connected with the first connecting arm 214, the second connecting arm 215, the first reinforcing plate 211 and the second reinforcing plate 212.

[0060] Further, the turning seat 220 includes a seat body 221 and a first hinged arm 222 and a second hinged arm 223 arranged on both sides of the seat body 221; the first hinged arm 222 and the second hinged arm 223 are respectively hinged to the first connecting arm 214 and the second connecting arm 215, so as to realize the turning movement of the turning seat 220 based on the fixed seat 210.

[0061] In the embodiment, the first and second hinge arms 222 and 223 of the turnover base 220 are hinged with the first and second connecting arms 214 and 215 of the fixed base 210 respectively, so that the turnover base 220 can be turned around the hinge point. In practical application, this design can facilitate the adjustment of the test piece installed on the turnover base 220 to different angles. For example, in some test scenarios that need to simulate different working conditions or angles, the test piece can be accurately adjusted to the required angle position by turning over the turnover base 220, so as to obtain more comprehensive and accurate test data. Moreover, the first and second reinforcing plates 211 and 212 not only enhance the structural strength between the fixed plate 213 and the connecting arms, but also ensure that the fixed base 210 is not easily deformed or damaged when bearing the weight of the turnover base 220 and the test piece and the force generated during the turning process, thereby ensuring the stability and reliability of the entire structure, prolonging the service life of the equipment, and also helping to improve the smoothness of the turning motion, reduce shaking and vibration caused by insufficient structural strength, and provide protection for the accuracy of the test.

[0062] Further, the top of the first and second hinge arms 222 and 223 is further provided with a reinforcing portion 230, which includes a first set of rib plates 231 and a second set of rib plates 232; the top of the first and second sets of rib plates 231 and 232 is provided with a fixing mechanism 233 for fixing the test piece.

[0063] Further, the first and second sets of rib plates 231 and 232 can further enhance the structural strength of the first and second hinge arms 222 and 223. When the turnover base 220 drives the test piece to turn over, the force on the top is relatively complex, and these two sets of rib plates can effectively disperse these forces, avoid damage to the top of the hinge arm due to excessive force, and ensure stable operation of the entire turnover structure.

[0064] Secondly, the fixing mechanism 233 arranged on the top of the rib plate plays a key role in the fixation of the test piece. It can ensure that the test piece remains stable during the turning process at different angles and does not displace or fall off. In the test process, the accuracy of the test piece position is crucial, and even a small displacement can cause deviation in the test data. The fixing mechanism 233 firmly fixes the test piece through a reliable connection method, providing strong support for the accuracy of the test data.

[0065] Furthermore, from the perspective of overall device operation, the combination of the reinforcing portion 230 and the fixing mechanism 233 helps to optimize the overall performance of the device. The stable structure and reliable fixation enable the device to better cope with various complex test requirements during long-term operation, reduce maintenance costs and downtime, and improve the efficiency of the device. At the same time, this design also enhances the versatility of the device, enabling it to adapt to a variety of different types and specifications of test pieces, expanding the application range of the device and meeting the needs of more diverse test scenarios.

[0066] Specifically, the top of the first mounting plate 216 is provided with a limiting plate 235, and the mounting position 234 is formed between the limiting plate 235 and the first mounting plate 216; when installing the test piece, one end of the test piece is fixed on the fixing mechanism 233 using a special countersunk head bolt, and the other end is placed in the mounting position 234 and abuts against the limiting plate 235.

[0067] During the reciprocating bending fatigue test, the drive cylinder 410 drives the turnover mechanism 200 to rotate, thereby driving the test piece to move. At this time, the test piece moves and completes due to the abutment of one end of the test piece against the limiting plate 235, and the reciprocating bending fatigue test of the test piece is realized through the reciprocating movement of the drive cylinder 410.

[0068] Further, the measuring mechanism 300 includes a first pressure sensor 121, a second pressure sensor 122, a third pressure sensor 123, and a fourth pressure sensor 124 in electrical connection with the measurement host 310; the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124 are respectively arranged at the four corners between the first mounting plate 216 and the second mounting plate 217.

[0069] Specifically, four pressure sensors in electrical connection with the measurement host 310 are respectively arranged at the four corners between the first mounting plate 216 and the second mounting plate 217, which can synchronously collect pressure data from multiple stress points of the test piece. Through multi-point measurement, the pressure distribution of the test piece during different turnover angles or reciprocating movements can be comprehensively captured, avoiding local deviations that may exist in single-point measurement, and improving the accuracy and reliability of pressure detection through mutual verification of multiple sets of data. Meanwhile, the measurement host 310 can integrate and process multi-sensor data, facilitating the rapid acquisition of the overall stress state of the test piece and providing more comprehensive and accurate data support for evaluating the performance of the test piece in the fatigue reciprocating test under pressure.

[0070] Further, in this embodiment, the working process of the fatigue reciprocating device 100 for pressure testing of test pieces revolves around three core links: "turnover action driving-pressure real-time monitoring-angle accurate control", as follows:

[0071] Test piece installation

[0072] The fixed part of the test piece is installed on the top of the turnover seat 220, and the movable part is installed on the fixed mechanism 233 on the top of the first mounting plate 216 of the fixed seat 210, and the other end abuts against the limiting plate 235; so that the test piece can simulate the stress condition in the actual working state during the turnover process. The pressure sensor 121 is clamped between the first mounting plate 216 and the second mounting plate 217, and directly contacts the movable part of the test piece, ensuring that the force transmission is not deviated.

[0073] Turnover action driving

[0074] The driving part 400 (driving cylinder 410) is powered by an air compressor, and the piston rod 411 is hinged to the bottom of the turnover seat 220. When the piston rod 411 extends and retracts, it will drive the turnover seat 220 to rotate around the connecting arm of the fixed seat 210, realizing the reciprocating turnover action of the test piece.

[0075] The turnover angle is controlled by the control system through the first magnetic inductor 412 and the second magnetic inductor 413: the magnetic inductor detects the extension amount of the piston rod 411, and when the piston rod 411 reaches the preset position, the control system controls the air compressor to stop or reverse the gas supply, thereby limiting the maximum turnover angle of the turnover seat 220 (the angle range can be flexibly changed by adjusting the position of the magnetic inductor).

[0076] The turnover speed is adjusted by the gas flow knob of the control cabinet 110: the knob controls the gas flow output by the air compressor, changes the action speed of the driving cylinder 410, and realizes stepless speed regulation in the turnover process.

[0077] Pressure signal transmission

[0078] The pressure generated by the test piece during the turnover process is transmitted to the pressure sensor 121 through the first mounting plate 216, the sensor converts the mechanical signal into an electrical signal, and transmits it to the measurement host 310 in real time.

[0079] Further, the device 100 supports two test modes: manual and automatic, which can meet the test needs of different scenes:

[0080] Automatic mode (fatigue reciprocating test)

[0081] Suitable for long-term, high-frequency fatigue performance evaluation. By controlling the system to preset the flip angle range (such as 0°-90°) and the number of reciprocations (such as 10,000 times), the driving cylinder 410 automatically drives the flip seat 220 to reciprocate according to the set parameters.

[0082] During the test, the pressure sensor 121 continuously collects pressure data of the test piece under different angles and different stress states, and the host computer 310 synchronously records and stores the data to form a pressure change curve.

[0083] Manual mode (multi-angle static test)

[0084] Suitable for observing the instantaneous state of the test piece at a specific angle. By manually controlling the start and stop of the driving cylinder 410, the flip seat 220 is fixed at the target angle (such as 30°, 60°), and at this time the pressure sensor 121 can measure the static pressure value of the test piece at this angle, which is convenient for intuitive observation of deformation or stress details.

[0085] Further, when reading, the pressure sensor 121 (such as the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124 distributed in four corners) directly bears the pressure transmitted by the test piece, and after converting the pressure value into an electrical signal, it is transmitted to the measurement host computer 310 through wired or wireless means. The measurement host computer 310 integrates multiple sensor data (such as calculating the average value or peak value) to eliminate errors caused by uneven local stress.

[0086] The measurement host computer 310 displays the current pressure value (usually in units of N or kgf) in real time through the display screen, and automatically records the pressure change curve with time and flip angle. At the same time, the control system synchronously records the flip angle, the number of reciprocations and other parameters to form a complete test log.

[0087] Please refer to Figure 3 , the first magnetic inductor 412 and the second magnetic inductor 413 detect the extension amount of the piston rod 411, which is converted into flip angle data (calculated through the preset "piston rod 411 stroke-angle" correspondence), and is stored in association with the pressure data, ensuring that each pressure value can correspond to a specific flip angle.

[0088] Specifically, the pressure data directly reflects the stress capacity of the test piece at different flip angles: if the pressure value at a certain angle is abnormal (such as sudden rise or sudden drop), it may indicate that the test piece has a weak structure.

[0089] In fatigue testing, by analyzing the pressure change trend (such as pressure attenuation rate) after multiple reciprocations, the durability of the test piece can be evaluated to determine whether it meets the design life requirement.

[0090] If uneven pressure distribution is found in the test (such as excessively high sensor values in a certain area), it can guide the optimization of the structure of the test piece (such as adjusting the material thickness or the connection method).

[0091] When the data is suspected to be unreliable, the actual pressure values at different angles can be compared with the design expected values to verify whether the test piece meets the design standards and provide data support for mass production of special equipment.

[0092] If pressure mutation or angle control abnormality occurs in the test, combined with the parameters recorded synchronously, the fault cause (such as sensor failure, drive cylinder 410 air leakage, etc.) can be quickly located, and the maintenance efficiency of the device 100 is improved.

[0093] Through the above working and testing methods, the device 100 realizes the integrated process of "reversible angle adjustable-precise pressure measurement-automatic data recording", effectively solving the problems of high cost, low efficiency and inaccurate data in traditional testing.

[0094] Further, this reciprocating fatigue test can simulate the durability under actual working conditions. The driving part 400 drives the reversing seat 220 to reciprocate, so that the test piece is repeatedly stressed at different angles, simulating the long-term dynamic load it may experience in actual use (such as frequent angle changes, vibration, etc. of special equipment in operation), thereby evaluating the structural stability of the test piece under long-term fatigue action and determining whether it can meet the design service life requirements (for example, testing whether a certain part deforms, breaks or other failure phenomena after tens of thousands of reciprocating actions).

[0095] The structural strength and pressure bearing capacity can also be verified. During the test, the pressure sensors (first pressure sensor 121, second pressure sensor 122, third pressure sensor 123, fourth pressure sensor 124) monitor the pressure changes of the test piece at different reversing angles (static or dynamic) in real time, and the actual pressure bearing data of the test piece at various attitudes can be directly obtained. This helps to verify whether the structural strength of the test piece meets the design standards, for example, whether it can withstand the preset pressure value at a certain angle without damage, providing a basis for evaluating its safe bearing capacity.

[0096] It can also meet the individual needs of different test pieces. The device realizes stepless adjustment of the reversing angle and speed by adjusting the related components of the driving part 400, which can adapt to the testing needs of various special equipment. There is no need to manufacture sample pieces for test pieces of different specifications and different reversing angle requirements, which greatly reduces the cost caused by sample piece customization, reduces the test preparation time, and improves the test efficiency.

[0097] And support multi-angle observation and comprehensive analysis, the device has manual and automatic mode, manual mode is convenient for static observation of test piece deformation, stress details and other changes under a certain angle; automatic mode can efficiently complete fatigue reciprocating test and record data. This flexibility enables the test personnel to analyze the performance of the test piece from multiple angles, ensuring the comprehensiveness of the test results.

[0098] The most commonly used is to directly obtain real pressure data, and the pressure sensor (first pressure sensor 121, second pressure sensor 122, third pressure sensor 123, fourth pressure sensor 124) is directly arranged in the stress transmission path between the test piece and the fixed seat 210 (between the first mounting plate 216 and the second mounting plate 217), avoiding the impact of unreasonable sensor installation position in traditional test, ensuring the accuracy of pressure measurement. At the same time, without complex conversion, the actual pressure data of the test piece at any angle can be directly obtained, reducing the error that may be introduced in the conversion process and improving the reliability of the data.

[0099] When the detected pressure does not meet the preset requirements, the test piece can be adjusted based on real-time data until it meets the pressure standard. This process ensures that the performance of the test piece meets the standard before it is put into actual application, reducing subsequent problems caused by substandard performance.

[0100] Embodiment 2

[0101] In this embodiment, a fatigue reciprocating analysis method for test piece pressure test is provided, which is applied to the fatigue reciprocating device for test piece pressure test described in embodiment 1; the analysis method comprises:

[0102] Obtain test pressure data after the test device starts working.

[0103] After the test device starts, the test piece is installed on the mounting position 234 at the top of the turnover seat 220 and the first mounting plate 216 of the fixed seat 210, and the stress test is carried out with the reciprocating turnover of the turnover mechanism 200.

[0104] At this time, the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123 and the fourth pressure sensor 124 arranged between the first mounting plate 216 and the second mounting plate 217 receive the pressure force transmitted by the test piece at different turnover angles, convert the mechanical signal into an electrical signal (such as voltage or current signal), and transmit it to the measurement host 310 in real time through the electrical signal connection. The measurement host 310 processes the received electrical signal (such as filtering, amplification, calibration), synchronously records and stores the real-time pressure values of each sensor during the test process, thereby completing the acquisition of test pressure data.

[0105] The test pressure data is matched with the standard value of the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124 under the same test environment, respectively.

[0106] The standard value range of the four pressure sensors (the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124) is determined in advance through a calibration process under the same test environment (such as the same temperature, humidity, test piece installation method, etc.).

[0107] The standard value range is based on the accuracy parameters of the sensors, the design requirements of the test device, and the preset pressure threshold of the test piece. For example, the standard value of a certain sensor can be set as the theoretical pressure value under a certain angle ± 5% error interval.

[0108] The test pressure data of the four pressure sensors (the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124) collected in real time during the test process are extracted from the measurement host 310, including the instantaneous pressure value of each sensor under the corresponding flip angle and the measurement value at the same time point. And compare each sensor's test pressure data with its preset standard value range one by one. For example, compare the real-time pressure value of the first pressure sensor 121 with the standard value range of the sensor under the same test environment to determine whether it is within the range; similarly, complete the matching comparison of the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124.

[0109] If the test pressure data of a certain sensor falls within its standard value range, it is determined that the test pressure data of the sensor matches the standard value successfully; if it exceeds the standard value range, it is determined that the matching fails. Through the above steps, the matching operation of all sensor test pressure data and standard values is completed.

[0110] If the test pressure data matches the standard value of at least one sensor successfully, cross-verify the test pressure data according to the correlation model.

[0111] Call the pre-established "angle-pressure" correlation model; the correlation model integrates the "angle-average pressure" curve and the pressure decay rate curve, taking the flip angle as the correlation axis, and contains the static average pressure trend under different angles and the pressure decay trend in the dynamic fatigue process.

[0112] Substitute the flip angle and pressure value corresponding to the test pressure data that matches successfully into the correlation model to locate the static average pressure reference range under the same angle and the pressure decay reference trend corresponding to the reciprocation frequency stage in the model.

[0113] Compare the pressure value in the test pressure data with the average pressure trend of the "angle-average pressure" curve in the correlation model at the same angle to determine whether the pressure value is within the normal fluctuation range reflected by the curve (e.g., whether the deviation from the average pressure value is within the preset threshold).

[0114] In combination with the number of reciprocations recorded by the driving part 400, compare the pressure value corresponding to the test pressure data with the decay trend of the pressure decay rate curve in the correlation model at the same number of reciprocations to verify whether the decay amplitude of the pressure value is consistent with the overall decay law reflected by the curve.

[0115] If the test pressure data is consistent with the trend of the correlation model in both static trend verification and dynamic trend verification, it is determined that the cross-validation passes; if the data deviates from the model trend and exceeds the allowed error range in any verification, it is determined that the cross-validation does not pass.

[0116] If the cross-validation passes, it means that the test pressure data is consistent with the static trend of the "angle-average pressure" curve and the dynamic trend of the pressure decay rate curve in the correlation model, indicating that the data can reliably reflect the true performance of the test piece at the corresponding angle and number of reciprocations, and can be used as an effective basis for subsequent determination of whether the test piece is qualified.

[0117] If the cross-validation does not pass, it means that the test pressure data deviates from the normal static or dynamic performance trend, which may be caused by structural defects of the test piece, abnormal test process, etc. Such data cannot accurately reflect the true performance of the test piece, and the problem needs to be investigated in combination with the specific situation to avoid affecting the determination of the qualification of the test piece.

[0118] In this embodiment, data verification is performed through two actions of sensor data rejection and cross-validation, which allows sensor data rejection to filter out abnormal data that fails to match the standard value, avoiding invalid data caused by sensor failure, transient interference, etc. from entering subsequent analysis; cross-validation further verifies the consistency of the data with static and dynamic trends, and double protection makes the data used for determining the qualification of the test piece more real and reliable.

[0119] After rejecting invalid data, subsequent cross-validation can further exclude accidental deviations of the data, accurately locate the performance of the test piece at a specific angle and specific reciprocation stage, reduce the misjudgment caused by the one-sidedness of a single data dimension, and make the analysis of the performance of the test piece more practical.

[0120] The double verification mechanism forms a complete logical closed loop, which controls the quality from the data source and verifies the rationality in the data application link, making the determination result of whether the test piece is qualified more persuasive and providing a reliable basis for subsequent test piece adjustment or application.

[0121] In the prior art, data verification often relies on single sensor calibration or simple data comparison, which is easily affected by accidental errors. The double verification through the combination strategy of removing outliers and trend confirmation controls from two aspects of data validity and consistency, greatly reduces the risk of misjudgment and improves the comprehensiveness of verification.

[0122] In the traditional technology, the tests of the static and dynamic performance of the test piece are often independent of each other, and it is difficult to establish the correlation between the two. The method correlates the "angle-average pressure" curve (static) and the pressure decay rate curve (dynamic) through cross-validation, which can more accurately locate whether the static pressure problem of the test piece at a specific angle will exacerbate dynamic fatigue failure, and realizes the deep integration of performance analysis.

[0123] The double verification mechanism can filter and verify data in real time during the test process, reduce repeated testing due to data problems in the subsequent process, avoid invalid adjustment of the test piece based on incorrect data, save time and cost, and improve the overall test efficiency.

[0124] If the test pressure data fails to match the standard value of at least one sensor, the test pressure data is determined to be invalid and is removed.

[0125] After completing the one-by-one matching of the test pressure data with the respective standard values of the four pressure sensors (first pressure sensor 121, second pressure sensor 122, third pressure sensor 123, and fourth pressure sensor 124), the test pressure data corresponding to all the sensors that fail to match is filtered out. For example, if the real-time pressure value of the first pressure sensor 121 exceeds its preset standard value range (theoretical value ± 5% error interval), the test pressure data of the sensor at the corresponding time point or angle is marked as matching failure data.

[0126] According to the matching result, as long as there is at least one sensor whose test pressure data fails to match the standard value of the sensor (i.e., exceeds the standard value range), the group of associated test pressure data (including the synchronous data of other sensors at the same time point or angle) is determined to be invalid. This is because the abnormal data of a single sensor may reflect local stress abnormalities or temporary sensor failure during the test process, and the whole set of data needs to be excluded to avoid affecting the accuracy of subsequent analysis.

[0127] Through the data analysis module of the host computer 310, the test pressure data determined to be invalid is directly deleted from the original data set, or marked as "invalid" and automatically ignored in subsequent data processing (such as calculating the average pressure and drawing the curve), ensuring that the performance evaluation of the test piece is based only on valid data.

[0128] The establishment of the correlation model includes:

[0129] The real-time rotation angle of the rotating seat 220 is obtained by the first magnetic sensor 412 and the second magnetic sensor 413.

[0130] The pressure data corresponding to the rotation angle is obtained by the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124.

[0131] The first magnetic sensor 412 and the second magnetic sensor 413 are installed on the cylinder body of the driving cylinder 410, corresponding to the movement path of the piston rod 411. When the driving cylinder 410 of the driving part 400 works, the piston rod 411 extends and retracts to drive the rotating seat 220 to rotate around the fixed seat 210. At this time, the position change of the piston rod 411 is sensed by the first magnetic sensor 412 and the second magnetic sensor 413.

[0132] The two magnetic sensors convert the mechanical displacement into an electrical signal by detecting the position of the magnetic element on the piston rod 411, and transmit it to the control system of the control cabinet 110. The control system calculates and outputs the real-time rotation angle of the rotating seat 220 according to the preset corresponding relationship between the extension amount of the piston rod 411 and the rotation angle of the rotating seat 220, such as 5° rotation of the rotating seat 220 corresponding to 1 cm extension of the piston rod 411, thereby completing the acquisition of the real-time rotation angle.

[0133] The average pressure value under the same rotation angle is calculated and the "angle-average pressure" curve is drawn.

[0134] The test pressure data after validity verification is extracted from the measurement host 310, grouped by rotation angle, and the pressure measurement values of the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124 under the same angle are grouped.

[0135] For each angle group, the arithmetic mean of the four pressure sensor measurement values is calculated, that is, the average pressure value = (first sensor value + second sensor value + third sensor value + fourth sensor value) / 4, to obtain the average pressure value corresponding to the rotation angle.

[0136] The rotation angle is taken as the horizontal axis (unit: degree), and the average pressure value is taken as the vertical axis (unit: N). All angles and their corresponding average pressure values are arranged to form a series of coordinate points.

[0137] The coordinate points are connected in order of increasing angle by the data analysis module of the measurement host 310 or professional drawing tools to form a continuous "angle-average pressure" curve. This curve directly reflects the average pressure-bearing characteristics of the test piece under different static angles.

[0138] The reciprocating times of the driving part 400 are obtained, and the pressure decay rates corresponding to different reciprocating times are calculated and plotted into a pressure decay rate curve.

[0139] The control system of the driving part 400 records the number of times that the driving cylinder 410 drives the overturning seat 220 to complete a reciprocating overturning, that is, one complete cycle from the initial angle to the maximum angle and back to the initial angle is recorded as 1 time, and the number of times is stored in association with the corresponding time node.

[0140] The test pressure data verified for validity is extracted from the measurement host 310, grouped according to the reciprocating times, and the average pressure values of the first pressure sensor 121, the second pressure sensor 122, the third pressure sensor 123, and the fourth pressure sensor 124 under each reciprocating time are obtained (the calculation method is the same as the average pressure value in the “angle-average pressure” curve).

[0141] The average pressure values at the initial stage of the test (such as the first 3 reciprocations) are selected as the initial pressure reference values, which represent the initial pressure bearing capacity of the test piece when no obvious fatigue loss occurs.

[0142] For each reciprocating time, the corresponding pressure decay rate is calculated according to the formula “pressure decay rate = (initial pressure reference value-average pressure value under this time) / initial pressure reference value×100%”, and the “reciprocating time-pressure decay rate” data set is obtained.

[0143] With the reciprocating times as the horizontal axis and the pressure decay rates as the vertical axis, the data points are connected in the order of increasing reciprocating times by the data analysis module of the measurement host 310 or professional drawing tools, forming a pressure decay rate curve, which directly reflects the decay trend of the pressure of the test piece with the reciprocating times in the dynamic fatigue test.

[0144] The “angle-average pressure” curve and the pressure decay rate curve are integrated with the overturning angle as the correlation axis to form a correlation model.

[0145] The overturning angle (0°-90° specific angle value detected by the first magnetic inductor 412 and the second magnetic inductor 413) is taken as the core correlation axis, and each angle value on the axis is taken as the reference point for connecting the data of the two curves.

[0146] The average pressure value corresponding to each overturning angle is extracted from the “angle-average pressure” curve to form an “angle-average pressure” data set, and the pressure decay rate corresponding to each overturning angle in each segment (such as every 100 reciprocations) is extracted from the pressure decay rate curve to form a “reciprocating time-angle-decay rate” data set.

[0147] With the flip angle as the common index, the "angle-average pressure" data set is matched with the "reciprocating frequency-angle-decay rate" data set to build a four-dimensional correlation relationship of "angle-average pressure-pressure decay rate-reciprocating frequency" (actually integrated into a three-dimensional visual model with angle as the axis), so that each angle corresponds to both the static average pressure value and the pressure decay rate under different reciprocating frequencies.

[0148] The above correlation relationship is structured and integrated by data analysis software to form a correlation model with the flip angle as the horizontal axis, the average pressure and the pressure decay rate as the vertical axis (or displayed through layered views), and the reciprocating frequency as the dynamic dimension, which is stored in the database of the measurement host 310 for cross-validation.

[0149] Through the above operation, the two curves form an organic whole with angle as the link, so that the model can not only reflect the static pressure-bearing characteristics of a certain angle, but also embody the performance change law of the angle in the dynamic fatigue process.

[0150] The cross-validation result of the test pressure data based on the correlation model is judged against the preset standard to determine whether the test piece is qualified.

[0151] The preset standard includes two core indicators: one is the static pressure threshold of the test piece at different flip angles (such as the average pressure at a certain angle needs to be ≥300N and ≤800N); the other is the pressure decay rate threshold in dynamic fatigue testing (such as when the reciprocating frequency reaches the preset upper limit, the decay rate needs to be ≤15%), which is based on the design requirements, use scenarios and industry standards of the test piece.

[0152] Key information is obtained from the cross-validation process, including the deviation of the test pressure data in the "angle-average pressure" curve (whether it is within the static pressure threshold range), the decay trend in the pressure decay rate curve (whether it exceeds the dynamic decay rate threshold), and the consistency of the multi-sensor data.

[0153] The cross-validation result is compared with the preset standard item by item. If the average pressure of the test pressure data at all angles meets the static pressure threshold, and the pressure decay rate does not exceed the dynamic threshold during the entire reciprocating test, and the multi-sensor data trends are consistent, the test piece is preliminarily determined to be qualified. If the static pressure of any angle exceeds the threshold, or the decay rate of a certain reciprocating stage breaks through the threshold, or the sensor data has significant inconsistencies that cannot be explained, the test piece is preliminarily determined to be unqualified.

[0154] Finally, the preliminary determination result needs to be reviewed to exclude false positives caused by temporary fluctuations in the test environment, data recording deviations and other factors not related to the test piece itself, and finally confirm whether the test piece is qualified, and generate a judgment report containing the judgment basis (such as the specific angle, reciprocating frequency and corresponding pressure data that exceed the threshold).

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fatigue reciprocating device for testing a test piece with pressure, characterized in that: include: A cabinet (100) includes a control cabinet (110) and an installation cabinet (120) integrated with the control cabinet (110); The turning mechanism (200) comprises a fixed seat (210) arranged on the top of the control cabinet (110) and a turning seat (220) capable of rotating based on the fixed seat (210), and a driving unit (400) is further provided at the bottom of the turning seat (220); A measuring mechanism (300) includes a measuring host (310) and at least one pressure sensor connected to the measuring host (310); A first mounting plate (216) and a second mounting plate (217) are provided on the top of the fixing seat (210), the pressure sensor is arranged between the first mounting plate (216) and the second mounting plate (217), and a test piece mounting position (234) is provided between the first mounting plate (216) and the top of the flip seat (220).

2. A fatigue reciprocating device for testing a test piece with pressure according to claim 1, characterized in that: The driving part (400) is configured as a driving cylinder (410), and the driving cylinder (410) is driven by an air compressor; The bottom of the driving cylinder (410) is fixedly connected to the top of the installation cabinet (120), and the piston rod (411) of the driving cylinder (410) is hinged to the bottom of the flip seat (220) to drive the flip seat (220) to flip.

3. A fatigue reciprocating device for testing a test piece with pressure according to claim 2, characterized in that: A control system is provided in the control cabinet (110), and the control system is provided with a knob for controlling the gas flow of the air compressor to adjust the gas flow; The control system is further provided with a first magnetic sensor (412) and a second magnetic sensor (413) via telecommunication connection. The first magnetic sensor (412) and the second magnetic sensor (413) are respectively arranged at two ends of the body of the driving cylinder (410) and are used to detect the extension amount of the piston rod (411) to control the flip angle of the flip seat (220).

4. A fatigue reciprocating device for testing a test piece with pressure according to claim 1, characterized in that: The fixing seat (210) comprises a fixing plate (213) and connecting arms arranged on the fixing plate (213), wherein the connecting arms comprise a first connecting arm (214) and a second connecting arm (215) arranged on both sides of the fixing plate (213).

5. A fatigue reciprocating device for testing a test piece with pressure according to claim 4, characterized in that: A first reinforcing plate (211) and a second reinforcing plate (212) are respectively provided on both sides of the top of the fixing plate (213); The first connecting arm (214) and the second connecting arm (215) are respectively arranged at one end of the first reinforcing plate (211) and the second reinforcing plate (212), and are integrally arranged with the first reinforcing plate (211) and the second reinforcing plate (212); The first mounting plate (216) is arranged on the top of the first connecting arm (214), the second connecting arm (215), the first reinforcing plate (211) and the second reinforcing plate (212), and is fixedly connected to the first connecting arm (214), the second connecting arm (215), the first reinforcing plate (211) and the second reinforcing plate (212).

6. A fatigue reciprocating device for testing a test piece with pressure according to claim 4, characterized in that: The flip seat (220) comprises a seat body (221) and a first hinged arm (222) and a second hinged arm (223) arranged on both sides of the seat body (221); The first hinged arm (222) and the second hinged arm (223) are respectively hinged to the first connecting arm (214) and the second connecting arm (215), so as to realize the flipping movement of the flip seat (220) based on the fixed seat (210).

7. A fatigue reciprocating device for testing a test piece with pressure according to claim 6, characterized in that: A reinforcement portion (230) is further provided on the top of the first hinged arm (222) and the second hinged arm (223), and the reinforcement portion (230) includes a first group of ribs (231) and a second group of ribs (232); A fixing mechanism (233) for fixing the test piece is provided on the top of the first group of ribs (231) and the second group of ribs (232).

8. A fatigue reciprocating device for testing a test piece with pressure according to claim 1, characterized in that: The measuring mechanism (300) includes a first pressure sensor (121), a second pressure sensor (122), a third pressure sensor (123), and a fourth pressure sensor (124) which are connected to a measuring host (310) by telecommunication; The first pressure sensor (121), the second pressure sensor (122), the third pressure sensor (123) and the fourth pressure sensor (124) are respectively arranged at four corners between the first mounting plate (216) and the second mounting plate (217).

9. An analysis method for a test piece with pressure testing, applied to a fatigue reciprocating device for a test piece with pressure testing according to any one of claims 1 to 8, characterized in that: include: Obtaining test pressure data after the test device begins operation; Matching the test pressure data with the standard values ​​of the first pressure sensor, the second pressure sensor 122, the third pressure sensor, and the fourth pressure sensor under the same test environment; If the test pressure data fails to match the standard value of at least one sensor, the test pressure data is determined to be invalid and discarded; If the test pressure data successfully matches the standard value of at least one sensor, cross-validating the test pressure data according to the correlation model; The cross-validation result of the test pressure data based on the correlation model is compared with the preset standard to determine whether the test piece is qualified.

10. The analysis method for pressure testing of a test piece according to claim 9, characterized in that: The establishment of the association model includes: Acquiring a real-time flip angle of the flip seat (220) detected by the first magnetic sensor (412) and the second magnetic sensor (413); Obtaining pressure data corresponding to the flip angle synchronously collected by the first pressure sensor (121), the second pressure sensor (122), the third pressure sensor (123), and the fourth pressure sensor (124); Calculate the average pressure value at the same flip angle and draw an "angle-average pressure" curve; Obtaining the number of reciprocating times of the driving unit (400), calculating the pressure decay rates corresponding to different reciprocating times, and drawing a pressure decay rate curve; The "angle-average pressure" curve and the pressure decay rate curve are integrated with the flip angle as the correlation axis to form a correlation model.

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