Rigidity testing machine for automobile body part

Abstract

The invention discloses an automobile body part rigidity testing machine, which realizes wide applicability to various automobile body structural parts through modular design, can efficiently complete rigidity testing of different parts such as an automobile door, a tail door and an engine cover, and remarkably improves the universality and practicability of the testing machine. The testing machine adopts a servo loading mechanism and a high-precision sensing system to work cooperatively, full-automatic loading, data acquisition and analysis processes are realized, the manual operation intensity is greatly reduced, the consistency and reliability of testing results are ensured, meanwhile, the testing machine has multi-degree-of-freedom adjustment capability, and the testing efficiency is improved. The device can flexibly adapt to tested products with different shapes, sizes and installation positions, further enhances the accuracy and repeatability of measurement, is firm in overall structure, is convenient to adjust, supports the rapid and repeated test in a production field, gives consideration to the dual requirements of high efficiency and high precision, and has a good engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of mechanical measurement instrument technology, and relates to a stiffness testing device, specifically an automotive body stiffness testing machine. Background Technology

[0002] Currently, when testing the stiffness performance of exterior components (such as doors, tailgates, and hoods) of domestically produced new energy vehicles, manufacturers generally use stiffness testing machines based on mechanical push-pull force gauges. While these devices can perform basic testing functions, the entire testing process, including force application, data reading, recording, and analysis, heavily relies on manual operation. This traditional approach inevitably introduces numerous human factors: the magnitude of the operating force, the rate and duration of loading, and the timeliness and accuracy of data recording are all subject to the operator's subjective experience and sense of responsibility, making it difficult to effectively guarantee the standardization, consistency, and reliability of test results. Ultimately, the data deviations and non-repeatability caused by this human interference bring significant reference risks and uncertainties to the objective evaluation of product stiffness performance, making it difficult to meet the urgent needs of the new energy vehicle industry for high-quality component control and production automation. Summary of the Invention

[0003] To address the technical problems existing in the background art, this invention proposes an automotive body component stiffness testing machine, which realizes multi-scenario, multi-component, automated, and practical automotive body component stiffness testing.

[0004] The objective of this invention can be achieved through the following technical solutions: A servo loading mechanism includes: an electric cylinder, a first rotating base, a detection head, a pressure sensor, and a displacement sensor assembly. The electric cylinder is connected to one side of the first rotating base, and its output shaft passes through the first rotating base to drive the detection head to apply pressure to the product under test. The pressure sensor is connected between the output shaft of the electric cylinder and the detection head to collect pressure data applied by the detection head. The displacement sensor assembly is connected to the other side of the first rotating base and can rotate around the output shaft of the electric cylinder. A base plate corresponding to the displacement sensor assembly is connected to one side of the detection head to monitor the position change of the base plate and collect displacement data of the detection head through the displacement sensor assembly.

[0005] Furthermore, the servo loading mechanism also includes a second rotating seat, with the first rotating seat vertically connected to the second rotating seat to adjust the direction of the pressure applied by the detection head in the vertical direction.

[0006] Furthermore, the second rotating base includes: a mounting base plate and a second turntable. The second turntable is rotatably connected to the mounting base plate via a central pin. The mounting base plate has multiple positioning holes arranged in a circumferential array around the central pin. The second turntable has arc-shaped grooves corresponding to the positioning holes. The arc-shaped grooves are connected to any positioning hole via connecting bolts, so that the second turntable and the mounting base plate can be locked together by tightening the connecting bolts. The second turntable also has anti-slip holes with anti-slip bolts installed inside, so that the rotation of the second turntable can be restricted by tightening the anti-slip bolts.

[0007] Furthermore, the first rotating seat includes: a fixed plate and a first turntable. The fixed plate is vertically connected to the second turntable. An electric cylinder is connected to one side of the fixed plate. The output shaft of the electric cylinder passes through the fixed plate and is rotatably connected to the first turntable. A displacement sensor assembly is connected to the first turntable on a side offset from the output shaft of the electric cylinder.

[0008] Furthermore, multiple sets of displacement sensor assemblies are provided, and the multiple sets of displacement sensor assemblies are arranged in a circumferential array around the output shaft of the electric cylinder. Multiple base plates corresponding to the multiple displacement sensor assemblies are connected to the periphery of the detection head.

[0009] Furthermore, the displacement sensor assembly includes: a displacement sensor, a slide, and a guide rod. The displacement sensor is mounted on the top of the slide. A sliding hole adapted to the guide rod is provided on one side of the slide. One end of the guide rod is connected to the first rotating seat, and the other end passes through the sliding hole and is slidably connected to the slide. An expansion joint communicating with the sliding hole is provided at the bottom of the slide. The expansion joint can be closed using a compression bolt to lock the slide onto the guide rod.

[0010] A stiffness testing machine for automotive body parts includes: a servo loading mechanism, a test platform, and support columns. Multiple support columns are fixedly installed on the test platform, and the servo loading mechanism is installed on one of the support columns to perform stiffness testing on the products to be tested, which are respectively installed on the other support columns.

[0011] Furthermore, the support column includes: a column and a U-shaped plate. The front of the column is provided with a slide rail, and the top plate of the U-shaped plate is provided with a slider on one side. The slider is slidably connected to the slide rail so that the U-shaped plate can be adjusted up and down along the column. The servo loading mechanism / product under test is installed on the other side of the top plate of the U-shaped plate. Both sides of the column are provided with slots. The two side plates of the U-shaped plate are respectively connected to the slots on the two sides of the column by positioning bolts so that the U-shaped plate can be locked and fixed on the column by tightening the positioning bolts.

[0012] Furthermore, the stiffness testing machine also includes: a PLC control console, which is connected to the servo loading mechanism by a separate flexible cable. The electric cylinder, pressure sensor, and displacement sensor assembly are all connected to the PLC control console. The PLC control console controls the electric cylinder to drive the detection head to apply pressure to the product under test. The pressure sensor and displacement sensor assembly transmit the collected data to the PLC control console. The PLC control console records and presents the trend graph of the pressure and deformation of the product under test on the time axis, and analyzes the stiffness test results of the product under test.

[0013] Furthermore, a pyroelectric human infrared sensor is installed above the servo loading mechanism. The pyroelectric human infrared sensor is connected to the PLC control console. When the pyroelectric human infrared sensor detects a person, the PLC control console controls the servo loading mechanism to stop the test.

[0014] The beneficial effects of this invention are as follows: The automotive body stiffness testing machine provided in this application achieves wide applicability to various automotive body structural components through modular design. It can efficiently complete stiffness tests on different components such as doors, tailgates, and hoods, significantly improving the versatility and practicality of the testing machine. The testing machine adopts a servo loading mechanism and a high-precision sensing system working together to realize a fully automated loading, data acquisition, and analysis process. This not only greatly reduces the intensity of manual operation but also ensures the consistency and reliability of test results. At the same time, the testing machine has multi-degree-of-freedom adjustment capabilities, which can flexibly adapt to products of different shapes, sizes, and installation positions, further enhancing the accuracy and repeatability of measurements. The overall structure is robust and easy to adjust, supporting rapid and repeated testing on the production site. It takes into account both high efficiency and high precision requirements and has good engineering application value. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall invention.

[0016] Figure 2 This is a schematic diagram of the support column of the present invention.

[0017] Figure 3 A schematic diagram of a servo loading mechanism for mounting a set of displacement sensor components.

[0018] Figure 4 A schematic diagram of a servo loading mechanism for mounting two sets of displacement sensor assemblies.

[0019] Figure 5 This is a schematic diagram of the installation of the first and second rotating seats of the present invention.

[0020] Figure 6 This is a schematic diagram of the displacement sensor assembly of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, this invention provides an automotive body component stiffness testing machine, comprising: a test bench 100, support columns 200, a servo loading mechanism 300, and a PLC control console 400. Multiple support columns 200 are fixedly mounted on the test bench 100. The servo loading mechanism 300 is installed on one of the support columns 200, and test products such as tailgates, doors, and hoods are installed on the other support columns 200. The PLC control console 400 and the servo loading mechanism 300 are connected by a separate flexible cable. The PLC control console 400 controls the servo loading mechanism 300 to automatically perform stiffness tests on multiple test products, enabling multi-scenario, multi-component, automated, and practical automotive body component stiffness testing. In terms of applicability, it can perform stiffness performance testing on most automotive body structural components. In terms of operational convenience, it allows for rapid and repetitive testing on a fixed platform in automotive production workshops and other settings, achieving a balance between efficiency and accuracy.

[0023] Specifically, such as Figure 2 As shown, the support column 200 includes: a column 201 and a U-shaped plate 202. A slide rail 203 is provided on the front of the column 201. A slider 204 is provided on one side of the top plate of the U-shaped plate 202. The slider 204 is slidably connected to the slide rail 203 and can slide along the extension direction of the slide rail 203 to achieve height adjustment of the U-shaped plate 202 on the column 201. The servo loading mechanism 300 / product under test is installed on the other side of the top plate of the U-shaped plate 202. By adjusting the height of the U-shaped plate 202, the installation height of the servo loading mechanism 300 / product under test is adjusted to match the servo loading mechanism 300 with the product under test. The column 201 has slots 205 on both sides. The two side plates of the U-shaped plate 202 are connected to the slots 205 on the two sides of the column 201 by positioning bolts. When the servo loading mechanism 300 / the product to be tested is adjusted to a suitable height, the U-shaped plate 202 can be locked and fixed on the column 201 by tightening the positioning bolts.

[0024] Preferably, a pyroelectric human infrared sensor 500 is installed above the servo loading mechanism 300, which can detect whether there is a person within a range of 5 meters in height and 2.5-3 meters in diameter. The pyroelectric human infrared sensor 500 is connected to the PLC control console 400. When the pyroelectric human infrared sensor 500 detects a person, the PLC control console 400 controls the servo loading mechanism 300 to automatically stop the test. The test can only start after the person leaves the test area, further ensuring the safety of the test and achieving the purpose of safe detection.

[0025] like Figure 3-4 As shown, the servo loading mechanism 300 includes: an electric cylinder 1, a first rotating base 2, a detection head 3, a pressure sensor 4, a displacement sensor assembly 5, and a second rotating base 7. The electric cylinder 1 is connected to one side of the first rotating base 2, and its output shaft passes through the first rotating base 2 to drive the detection head 3, thereby applying pressure to the product under test for stiffness testing. The pressure sensor 4 is connected between the output shaft of the electric cylinder 1 and the detection head 3 to collect pressure data applied by the detection head. The displacement sensor assembly 5 is connected to the other side of the first rotating base 2 and can rotate around the output shaft of the electric cylinder 1. A substrate 6 corresponding to the displacement sensor assembly 5 is connected to one side of the detection head 3. The displacement sensor assembly 5 can detect the distance between itself and the substrate 6 and collect displacement data of the detection head 3 based on changes in the position of the substrate 6.

[0026] Electric cylinder 1, pressure sensor 4, and displacement sensor assembly 5 are all communicatively connected to PLC control console 400. The PLC control console 400 presets the loading speed, loading stroke, number of reciprocating strokes, and reciprocating interval of electric cylinder 1 to control it, driving the detection head 3 to apply pressure to the product under test. Pressure sensor 4 transmits the collected pressure data to PLC control console 400 at a preset frequency, recording and displaying the trend of pressure on the product under test over time. Displacement sensor assembly 5 transmits the collected displacement data to PLC control console 400 at a preset frequency, recording and displaying the trend of surface deformation on the product under test over time, thus obtaining the stiffness test results of the product under test. The data acquisition frequency of pressure sensor 4 and displacement sensor assembly 5 is 10Hz / s, or 0.1s / time.

[0027] The PLC control console 400 uses a Huichuan 15-inch HMI screen and a Huichuan Easy521 PLC. Electric cylinder 1 uses a Honghe servo electric cylinder and a Huichuan 18-bit absolute servo system. Electric cylinder 1 has an effective stroke of 150mm, a thrust of 3.5KN, a lead screw of 5mm, a speed of 0-150mm / s, a motor power of 0.75KW, a speed of 3000RPM, and a speed ratio of 1.5:1. Electric cylinder 1 is equipped with front and rear stroke limit switches. Pressure sensor 4 uses a SIMBATOUCH SBT602-300 pressure sensor with a range of 3.0KN and a comprehensive error of: < / =+ / -0.02%。

[0028] The servo loading mechanism 300 is mounted on the U-shaped plate 202 of the support column 200 via the second rotating seat 7. The first rotating seat 2 is vertically connected to the second rotating seat 7, and can achieve an angle adjustment of 0-90 degrees in the vertical direction to adjust the direction of the pressure applied by the detection head 3, so that the detection head 3 can apply pressure to the product under test from a direction perpendicular to the surface of the product under test, thereby improving the accuracy of the test.

[0029] Specifically, such as Figure 5 As shown, the second rotating base 7 includes a mounting base 71 and a second turntable 72. The mounting base 71 is fixedly connected to the U-shaped plate 202 of the support column 200 by mounting bolts. The second turntable 72 is rotatably connected to the mounting base 71 by a central pin 73. The second turntable 72 can rotate with the central pin 73 as the center. The second turntable 72 is provided with a 180-degree semi-circular scale bar to precisely adjust the rotation angle of the second turntable 72. The mounting base 71 has multiple positioning holes 74 arranged in a circumferential array around the central pin 73. The second turntable 72 has two arc-shaped grooves 75 corresponding to the positioning holes 74. The arc-shaped grooves 75 are connected to any of the positioning holes 74 by connecting bolts. After the second turntable 72 is rotated to a suitable angle, the second turntable 72 can be locked to the mounting base 71 by tightening the connecting bolts. The second turntable 72 is also provided with anti-slip holes 76, and anti-slip bolts are provided in the anti-slip holes 76. After tightening the connecting bolts to lock the second turntable 72 to the mounting base plate 71, tightening the anti-slip bolts can further restrict the rotation of the second turntable 72, lock the angle of the second turntable, and ensure the stability of the test process. When the test is completed and the servo loading mechanism 300 needs to be adjusted again, the connecting bolts in the positioning hole 74 are removed first, and then the anti-slip bolts in the anti-slip hole 76 are screwed in again to automatically push the second turntable 72 outward and separate it from the mounting base plate 71.

[0030] The first rotating base 2 includes a fixed plate 21 and a first turntable 22. The fixed plate 21 is vertically connected to the second turntable 72. An electric cylinder 1 is connected to one side of the fixed plate 21. The output shaft of the electric cylinder 1 passes through the fixed plate 21 and is rotatably connected to the first turntable 22. The first turntable 22 can rotate with the output shaft of the electric cylinder 1 as the center. A displacement sensor assembly 5 is connected to the first turntable 22 on a side offset from the output shaft of the electric cylinder 1. When the first turntable 22 rotates, it drives the displacement sensor assembly 5 to rotate around the output shaft of the electric cylinder 1, realizing 360-degree omnidirectional adjustment of the position of the displacement sensor assembly 5 to adapt to products of different sizes and shapes, and to avoid the products under test from obstructing or interfering with the operation of the displacement sensor assembly 5. The first turntable 22 and the fixed plate 21 adopt the same locking and anti-slip structure as the second turntable 72 and the mounting base plate 71.

[0031] Preferably, multiple sets of displacement sensor assemblies 5 are provided, arranged in a circumferential array around the output shaft of the electric cylinder 1 and rotating around the output shaft. Multiple substrates 6, each corresponding to one of the multiple displacement sensor assemblies 5, are connected to the periphery of the detection head 3, allowing the positional changes of the multiple substrates 6 to be monitored by the multiple displacement sensor assemblies 5. The multiple sets of displacement sensor assemblies 5 have different accuracies and can be switched according to the accuracy requirements and size / shape of the product under test. Multiple sets of displacement sensor assemblies 5 can be used simultaneously or individually. If the detection space for the product under test is limited, a single substrate 6 can be used with one set of displacement sensor assemblies 5 for detection, while the other displacement sensor assemblies 5 and substrates 6 are removed. For example, in the case of automotive body parts with outer and inner panels, testing the rigidity of internal components in a confined detection space is considered an operation requiring testing within a limited space.

[0032] Specifically, such as Figure 6 As shown, the displacement sensor assembly 5 includes a displacement sensor 51, a slide block 52, and a guide rod 53. The displacement sensor 51 is mounted on the top of the slide block 52. A sliding hole 54 adapted to the guide rod 53 is provided on one side of the slide block 52. One end of the guide rod 53 is connected to the first rotating seat 2, and the other end passes through the sliding hole 54 and is slidably connected to the slide block 52. The slide block 52 can slide along the extension direction of the guide rod 53 to adjust the initial distance between the displacement sensor 51 and the substrate 6. A scale strip is provided on the guide rod 53 to precisely adjust the position of the displacement sensor 51. The bottom of the slide block 52 is provided with an expansion joint 55 communicating with the sliding hole 54. A clamping bolt is connected in the expansion joint 55. After the displacement sensor 51 is moved to a suitable position, the expansion joint 55 can be closed by tightening the clamping bolt, so that the slide block 52 is locked and fixed on the guide rod 53, locking the initial distance between the displacement sensor 51 and the substrate 6.

[0033] In this embodiment, as Figure 4As shown, two sets of displacement sensor assemblies 5 are arranged opposite each other on both sides of the output shaft of the electric cylinder 1. The base plate 6 on the detection head 3 extends to both sides, corresponding to the two sets of displacement sensor assemblies 5. Both displacement sensors 51 are Keyence laser displacement sensors. One displacement sensor 51 has a measurement distance of 50mm, an accuracy of 0.005-0.01mm, and a measurement range of 55-105mm from the probe. The other displacement sensor 51 has a measurement distance of 290mm, an accuracy of 0.03-0.05mm, and a measurement range of 160-450mm from the probe. The base plate 6 is provided with a scale bar. After replacing or adjusting the position of the laser displacement sensor 51, the scale bar on the base plate 6 can keep the measurement spot of the reassembled laser displacement sensor 51 in the same position, ensuring that the reference point remains unchanged during repeated assembly and use of the laser displacement sensor 51, and guaranteeing the repeatability accuracy of the test data.

[0034] The electrical control process in this embodiment is as follows: S1. Using the PLC control console 400, preset the maximum pressure value of the pressure sensor 4, the maximum displacement value of the laser displacement sensor 51, the loading speed, loading stroke, loading reciprocating number and reciprocating interval of the electric cylinder 1, and select one of the two laser displacement sensors 51 for detection or detect both simultaneously.

[0035] S2. The loading stroke is associated with the pressure data and displacement data. The loading speed and loading stroke of the electric cylinder 1 preset in S1 are used to drive the detection head 3 to start advancing. When the pressure sensor 4 detects that the advancing pressure of the detection head 3 reaches the maximum pressure value preset in S1, the advancement stops. Or when the displacement sensor assembly 5 detects that the displacement of the detection head 3 reaches the maximum displacement value preset in S1, the advancement stops.

[0036] S3, pressure sensor 4, and displacement sensor assembly 5 generate real-time independent trend charts based on the first and last data collections of the preset loading reciprocating number in S1. (Pressure sensor: independent trend charts for the first and last data collections; Laser displacement sensor 1: independent trend charts for the first and last data collections; Laser displacement sensor 2: independent trend charts for the first and last data collections.) S4, Trend Chart Overlay Reproduction: Pressure Sensor: The first and last overlay trend charts are presented by calling historical data to display the overlay trend chart. Displacement Sensor No. 1: The first and last overlay trend charts are presented by calling historical data to display the overlay trend chart. Displacement Sensor No. 2: The first and last overlay trend charts are presented by calling historical data to display the overlay trend chart.

[0037] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A servo loading mechanism, characterized in that, include: The electric cylinder (1), the first rotating seat (2), the detection head (3), the pressure sensor (4), and the displacement sensor assembly (5) are connected to one side of the first rotating seat (2). The output shaft of the electric cylinder (1) passes through the first rotating seat (2) and drives the detection head (3) to apply pressure to the product to be tested. The pressure sensor (4) is connected between the output shaft of the electric cylinder (1) and the detection head (3) to collect the pressure data applied by the detection head. The displacement sensor assembly (5) is connected to the other side of the first rotating seat (2) and can rotate around the output shaft of the electric cylinder (1). A base plate (6) corresponding to the displacement sensor assembly (5) is connected to one side of the detection head (3) to monitor the position change of the base plate (6) through the displacement sensor assembly (5) and collect the displacement data of the detection head (3).

2. The servo loading mechanism according to claim 1, characterized in that, It also includes a second rotating seat (7), with the first rotating seat (2) vertically connected to the second rotating seat (7) to adjust the direction of the pressure applied by the detection head (3) in the vertical direction.

3. The servo loading mechanism according to claim 2, characterized in that, The second rotating seat (7) includes: a mounting base plate (71) and a second turntable (72). The second turntable (72) is rotatably connected to the mounting base plate (71) through a central pin (73). The mounting base plate (71) has multiple positioning holes (74) arranged in a circumferential array around the central pin (73). The second turntable (72) has an arc-shaped groove (75) corresponding to the positioning holes (74). The arc-shaped groove (75) is connected to any positioning hole (74) through a connecting bolt, so that the second turntable (72) and the mounting base plate (71) can be locked by tightening the connecting bolt. The second turntable (72) also has an anti-slip hole (76), and an anti-slip bolt is provided in the anti-slip hole (76) to restrict the rotation of the second turntable (72) by tightening the anti-slip bolt.

4. The servo loading mechanism according to claim 3, characterized in that, The first rotating seat (2) includes: a fixed plate (21) and a first turntable (22). The fixed plate (21) is vertically connected to the second turntable (72). An electric cylinder (1) is connected to one side of the fixed plate (21). The output shaft of the electric cylinder (1) passes through the fixed plate (21) and is rotatably connected to the first turntable (22). The displacement sensor assembly (5) is connected to the first turntable (22) on the side offset from the output shaft of the electric cylinder (1).

5. The servo loading mechanism according to claim 1, characterized in that, The displacement sensor assembly (5) is provided in multiple sets, and the multiple sets of displacement sensor assemblies (5) are arranged in a circumferential array around the output shaft of the electric cylinder (1). The detection head (3) is connected to multiple substrates (6) that correspond one-to-one with the multiple sets of displacement sensor assemblies (5).

6. The servo loading mechanism according to claim 1, characterized in that, The displacement sensor assembly (5) includes: displacement sensor (51), slide (52), and guide rod (53). The displacement sensor (51) is installed on the top of the slide (52). A sliding hole (54) adapted to the guide rod (53) is provided on one side of the slide (52). One end of the guide rod (53) is connected to the first rotating seat (2), and the other end passes through the sliding hole (54) and is slidably connected to the slide (52). The bottom of the slide (52) is provided with an expansion joint (55) communicating with the sliding hole (54). The expansion joint (55) can be closed by using a pressing bolt to lock the slide (52) onto the guide rod (53).

7. A stiffness testing machine for automotive body components, comprising the servo loading mechanism described in any one of claims 1-6, characterized in that, Also includes: Test bench (100) and support columns (200). Multiple support columns (200) are fixedly installed on the test bench (100). A servo loading mechanism is installed on one of the support columns (200) to perform stiffness tests on the products to be tested that are installed on the other support columns (200).

8. The testing machine according to claim 7, characterized in that, The support column (200) includes: a column (201) and a U-shaped plate (202). The column (201) is provided with a slide rail (203) on the front side. The top plate of the U-shaped plate (202) is provided with a slider (204) on one side. The slider (204) is slidably connected to the slide rail (203) so that the U-shaped plate (202) can be adjusted up and down along the column (201). The servo loading mechanism / product under test is installed on the other side of the top plate of the U-shaped plate (202). The two sides of the column (201) are provided with slots (205). The two side plates of the U-shaped plate (202) are respectively connected to the slots (205) on the two sides of the column (201) by positioning bolts so that the U-shaped plate (202) can be locked and fixed on the column (201) by tightening the positioning bolts.

9. The testing machine according to claim 7, characterized in that, Also includes: The PLC console (400) and the servo loading mechanism are connected by a separate flexible cable. The electric cylinder (1), pressure sensor (4), and displacement sensor assembly (5) are all connected to the PLC console (400) for communication. The PLC console (400) controls the electric cylinder (1) to drive the detection head (3) to apply pressure to the product under test. The pressure sensor (4) and displacement sensor assembly (5) transmit the collected data to the PLC console (400). The PLC console (400) records and presents the trend graph of the pressure and deformation of the product under test on the time axis, and analyzes the stiffness test results of the product under test.

10. The testing machine according to claim 9, characterized in that, A pyroelectric human infrared sensor (500) is installed above the servo loading mechanism. The pyroelectric human infrared sensor (500) is connected to the PLC control console (400). When the pyroelectric human infrared sensor (500) detects a person, the PLC control console (400) controls the servo loading mechanism to stop the test.

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