Multifunctional swing fatigue testing machine and testing method

Abstract

The application discloses a multifunctional swing fatigue testing machine and a testing method, and is applied to the swing testing technical field.The multifunctional swing fatigue testing machine comprises a supporting assembly, the supporting assembly comprises a pressure sensor, the upper end of the pressure sensor is fixedly installed with a hydraulic cylinder, the upper end of the hydraulic cylinder is fixedly connected with an extension rod, the upper end of the extension rod is fixedly installed with a universal joint, the upper end of the universal joint is fixedly installed with a supporting ball, a spring is arranged on the shaft of the extension rod, the upper end of the spring is fixedly connected with the extension rod, the lower end of the spring is fixedly connected with the hydraulic cylinder, and a displacement sensor is fixedly installed in the hydraulic cylinder.The multifunctional swing fatigue testing machine has the characteristics of realizing stable support of different kinds of to-be-tested seat circles.

Description

Technical Field

[0001] This invention relates to the field of swing testing technology, specifically to a multifunctional swing fatigue testing machine and testing method. Background Technology

[0002] The swing fatigue testing machine is a device used to simulate the stress state of an object in a swinging, tilting or vibrating environment. By controlling parameters such as swing angle, frequency, and load, it tests the reliability, durability or adaptability of the product.

[0003] Under current technology, swing fatigue testing machines are often integrated structures, with a single support platform supporting the test seat ring on the testing machine. However, the existing seat rings vary greatly in type and specification, and a single support platform often cannot meet the testing requirements.

[0004] Therefore, it is essential to design a multifunctional swing fatigue testing machine and testing method that can meet the requirements of different specifications and types of seat rings. Summary of the Invention

[0005] The purpose of this invention is to provide a multifunctional swing fatigue testing machine and testing method to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a multifunctional swing fatigue testing machine and testing method, comprising a control system and a support assembly. Each support assembly includes a pressure sensor, a hydraulic cylinder is fixedly mounted on the upper end of the pressure sensor, a telescopic rod is connected to the upper end of the hydraulic cylinder, a universal joint is mounted on the upper end of the telescopic rod, a support ball is connected to the upper end of the universal joint, a spring is sleeved on the shaft of the telescopic rod, the upper end of the spring is fixedly connected to the telescopic rod, the lower end of the spring is fixedly connected to the hydraulic cylinder, a displacement sensor is fixedly mounted inside the hydraulic cylinder, and a frame is fixedly mounted on the lower end of the support assembly.

[0007] According to the above technical solution, a rectangular groove is provided at the upper end of the frame, and several supporting components are fixedly installed inside the rectangular groove. The lower end of the pressure sensor is fixedly connected to the bottom of the rectangular groove. A steel platform is fixedly installed at the upper end of the frame, and a detection component is fixedly installed at the upper end of the frame.

[0008] According to the above technical solution, the detection component includes a second sliding track, which is symmetrically arranged at both ends of the support component. Each set of the second sliding track is fixedly installed on the upper end of the frame. A support column is fixedly installed on the upper end of each set of the second sliding track. A first sliding track is fixedly installed on the upper end of each set of the support column. A groove is provided on one side of each set of the first sliding track and each set of the second sliding track near the support component.

[0009] According to the above technical solution, each groove is provided with a lead screw. One end of each lead screw is connected to the corresponding sliding rail one and sliding rail two bearings. The other end of each lead screw is fixedly connected to a third drive. Each third drive is fixedly installed on the outer end of the sliding rail one and sliding rail two. A movable bracket is sleeved on the shaft of each lead screw. An installation platform is opened in the middle of each movable bracket. A structure light detector is fixedly installed on the opposite side of each installation platform.

[0010] According to the above technical solution, a gantry frame is provided on the outer side of each set of lead screws, and the gantry frame is fixedly installed at both ends of the outer side of the frame.

[0011] According to the above technical solution, the bottom of the crossbeam of the gantry frame is provided with two sets of moving grooves. Each set of moving grooves is provided with a second lead screw. The two sets of second lead screws are connected to the bearing of the gantry frame at their closest ends. The other end of each set of second lead screws is fixedly connected to a first drive. The first drive is fixedly installed on the outer ends of the two side columns of the gantry frame. Sliding grooves are provided on the front and rear surfaces of the two side columns of the gantry frame. A moving block is fixedly installed inside the sliding groove. A second drive is fixedly installed on the outer ends of the two side columns of the gantry frame. The second drive is connected to the moving block.

[0012] According to the above technical solution, each set of lead screws has a movable seat connected to its shaft by a thread. The movable seat is hinged to an adjustable support arm. The lower end of the adjustable support arm is fixedly connected to a cylinder. The lower end of the cylinder is connected to a rotatable rubber pad. The rotatable rubber pad includes an adapter. The lower end of the adapter is connected to a rotating component. The lower end of the rotating component is fixedly installed with a rubber pad.

[0013] According to the above technical solution, an installation platform is fixedly installed on the shaft of the adjustable support arm, and a movable shaft is machined on the two sides of the installation platform that are parallel to the front and rear sides of the gantry frame.

[0014] According to the above technical solution, each set of moving shafts is provided with a sliding base at the end away from the gantry frame, and a through hole is opened on the side of the sliding base away from the gantry frame, and the moving shafts are all sleeved in the through hole.

[0015] A method for using a multifunctional swing fatigue testing machine includes:

[0016] Step 1: Before the test begins, a portion of the seat ring is fixedly installed on the upper end of the steel platform. At this time, the rest of the seat ring is suspended in the air and located above several support components. After the vibration caused by the impact during the installation of the seat ring has completely decayed, the third drive is activated. The third drive drives the lead screw to rotate, and the lead screw drives the moving bracket to move along the axis of the lead screw. The moving bracket drives the structure light detector to move along the axis of the lead screw. During the movement, the structure light detector located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring to obtain the three-dimensional spatial information of the seat ring. This confirms that the seat ring is in a complete and undamaged state and also confirms the degree of irregularity on the surface of the seat ring.

[0017] Step 2: After confirming that the seat ring is in an undamaged state, preset the moving distance and deflection angle of the adjustable support arm required for this test in the control system. The structured light detector transmits three-dimensional spatial information to the control system. After receiving the three-dimensional spatial information, the control system controls the hydraulic cylinder to start. The hydraulic cylinder controls the telescopic rod to move towards the seat ring until the surface of the support ball makes point contact with the lower surface of the seat ring and provides support. The support method is adjusted according to the different requirements of different specifications and types of seat rings.

[0018] Step 3: After the support assembly completes the support of the seat ring, the control system starts the first drive and the second drive in sequence. The first drive drives the second lead screw to rotate, the second lead screw drives the movable seat to move along the axis of the second lead screw, the movable seat drives the adjustable support arm to move along the axis of the second lead screw, and the adjustable support arm drives the cylinder and the rotatable rubber pad to move along the axis of the second lead screw, so that the rotatable rubber pad can move laterally in a state perpendicular to the frame.

[0019] The second drive drives the moving block to move along the sliding groove, the moving block drives the sliding base to move along the sliding groove, and the sliding base drives the moving shaft to move along the through hole, thereby realizing the angle deflection of the adjustable support arm, which in turn drives the angle deflection of the cylinder and the rotatable rubber pad, thus realizing the adjustment of different test requirements for different specifications of seat rings;

[0020] When measuring the rocking stability of the seat ring, the adjustable support arm is tilted at a certain angle to the surface of the seat ring. When measuring the yield strength of the seat ring, the adjustable support arm is kept perpendicular to the surface of the seat ring.

[0021] Step 4: Once the rotatable rubber pad reaches the required position for the test, activate the cylinder. The cylinder will move the rotatable rubber pad toward the seat ring until it is close to the upper surface of the seat ring and a certain distance is maintained.

[0022] Step 5: Activate the cylinder, which drives the rotatable rubber pad to apply a load to the upper surface of the seat ring to test the performance of the seat ring under load. When measuring the sway stability of the seat ring, drive the cylinder to alternately apply the load to both sides of the seat ring. Each load application lasts for 1 second, with a 0.5 second interval before applying the load to the other side. Repeat this cycle to test the sway stability of the seat ring. When measuring the yield strength of the seat ring, drive the cylinder to apply the load to both sides of the seat ring while keeping the adjustable support arm stationary. That is, the load applied at this time is a static load.

[0023] Step Six: The control system restarts the third drive, which drives the lead screw to rotate. The lead screw drives the moving bracket to move along the axis of the lead screw, and the moving bracket drives the structured light detector to move along the axis of the lead screw. During the movement, the structured light detector located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring, obtaining the three-dimensional spatial information of the seat ring for the second time. The control system compares and analyzes the three-dimensional spatial information of the seat ring obtained in the second step with the three-dimensional spatial information of the seat ring obtained in Step One to determine whether the seat ring has experienced structural fracture during the operation in Step Five.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention, by setting up a support component, achieves stable support for seat ring structures with different specifications, types and support methods on the test platform. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a front view schematic diagram of the overall structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the support component structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the gantry structure of the present invention;

[0030] Figure 5 This is a bottom view of the gantry structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the rotatable rubber pad structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the support component structure of the present invention;

[0033] Figure 8 This is a schematic cross-sectional view of the displacement sensor installation of the present invention;

[0034] Figure 9 This is a front view schematic diagram of the sliding groove of the present invention;

[0035] In the diagram: 1. Cylinder; 2. Adjustable support arm; 3. Rotatable rubber pad; 301. Adapter; 302. Rotating component; 303. Rubber pad; 4. Frame; 5. Steel platform; 6. Gantry frame; 7. First drive; 8. Second drive; 9. Sliding base; 10. Detection assembly; 1001. Lead screw one; 1002. Support column; 1003. Sliding rail two; 1004. Sliding rail one; 1005. Moving bracket; 1006. Structured light inspection instrument; 1007, Third drive; 11, Support assembly; 1101, Support ball; 1102, Universal joint; 1103, Telescopic rod; 1104, Spring; 1105, Hydraulic cylinder; 1106, Pressure sensor; 12, Moving seat; 13, Lead screw II; 14, Mounting platform; 15, Displacement sensor; 16, Groove; 17, Moving groove; 18, Sliding groove; 19, Through hole; 20, Moving block; 21, Moving shaft. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1-9 The present invention provides a technical solution: a multifunctional swing fatigue testing machine and testing method, including a control system and a frame 4. A rectangular groove is opened at the upper end of the frame 4, and several support components 11 are fixedly installed inside the rectangular groove. A gantry frame 6 is fixedly installed at both ends of the outer side of the frame 4. A detection component 10 is fixedly installed at the upper end of the frame 4. A steel platform 5 is fixedly installed at the upper end of the frame 4. The steel platform 5 is used to fix the seat ring to be tested.

[0038] Each support assembly 11 includes a pressure sensor 1106. The lower end of the pressure sensor 1106 is fixedly connected to the bottom of the rectangular groove. A hydraulic cylinder 1105 is fixedly installed on the upper end of the pressure sensor 1106. A telescopic rod 1103 is connected to the upper end of the hydraulic cylinder 1105. A universal joint 1102 is installed on the upper end of the telescopic rod 1103. A support ball 1101 is connected to the upper end of the universal joint 1102. A spring 1104 is sleeved on the shaft of the telescopic rod 1103. The upper end of the spring 1104 is fixedly connected to the telescopic rod 1103. The lower end of the spring 1104 is fixedly connected to the hydraulic cylinder 1105. A displacement sensor 15 is fixedly installed inside the hydraulic cylinder 1105.

[0039] The detection component 10 includes a second sliding rail 1003, which is symmetrically arranged at both ends of the support component 11. Each set of second sliding rails 1003 is fixedly installed on the upper end of the frame 4. A support column 1002 is fixedly installed on the upper end of each set of second sliding rails 1003, and a first sliding rail 1004 is fixedly installed on the upper end of each set of support columns 1002. A groove 16 is provided on the side of each set of first sliding rails 1004 and each set of second sliding rails 1003 near the support component 11. A lead screw 1001 is provided inside each set of grooves 16, and one end of each set of lead screw 1001 is connected to the corresponding first sliding rail. 1004 and sliding rail 2 1003 are connected by bearings. The other end of each set of lead screw 1 1001 is fixedly connected to a third drive 1007. Each set of third drives 1007 is fixedly installed on the outer end of sliding rail 1 1004 and sliding rail 2 1003. Each set of lead screw 1 1001 is fitted with a movable bracket 1005. Each set of movable brackets 1005 has an installation platform in the middle. Each set of installation platforms has a structure light detector 1006 fixedly installed on one side opposite to the other. The structure light detectors 1006 at both ends of the seat ring scan and detect the entire surface of the seat ring and form a three-dimensional spatial model.

[0040] Two sets of moving grooves 17 are provided at the bottom of the crossbeam of the gantry frame 6. Each set of moving grooves 17 is equipped with a second screw rod 13. The two sets of second screw rods 13 are connected to the bearing of the gantry frame 6 at their closest ends. The other ends of each set of second screw rods 13 are fixedly connected to the first drive 7. The first drive 7 is fixedly installed on the outer ends of the two side columns of the gantry frame 6. Sliding grooves 18 are provided on the front and rear surfaces of the two side columns of the gantry frame 6. Moving blocks 20 are fixedly installed inside the sliding grooves 18. Second drive 8 is fixedly installed on the outer ends of the two side columns of the gantry frame 6. The second drive 8 is connected to the moving blocks 20.

[0041] It should be noted that the first drive 7 and the second drive 8 can be motors.

[0042] Each set of lead screws 13 has a movable seat 12 connected to its shaft by a thread. The movable seat 12 is hinged to an adjustable support arm 2. The lower end of the adjustable support arm 2 is fixedly connected to a cylinder 1. The lower end of the cylinder 1 is connected to a rotatable rubber pad 3. The rotatable rubber pad 3 includes an adapter 301. The lower end of the adapter 301 is connected to a rotating part 302. The lower end of the rotating part 302 is fixedly installed with a rubber pad 303.

[0043] An mounting platform 14 is fixedly mounted on the shaft of the adjustable support arm 2. Movable shafts 21 are machined on the two sides of the mounting platform 14 that are parallel to the front and rear sides of the gantry frame 6.

[0044] Each set of moving blocks 20 has a sliding base 9 fixedly installed at the end away from the gantry 6. The sliding base 9 has a through hole 19 on the side away from the gantry 6. The sliding base 9 is sleeved on the shaft of the moving shaft 21 through the through hole 19.

[0045] It should be noted that the third drive 1007 can be a motor.

[0046] In this embodiment:

[0047] Step 1: Before the test begins, a portion of the seat ring is fixedly installed on the upper end of the steel platform 5. At this time, the rest of the seat ring is suspended in the air and located above several support components 11. After the vibration caused by the impact during the installation of the seat ring has completely decayed, the third drive 1007 is activated. The third drive 1007 drives the lead screw 1001 to rotate. The lead screw 1001 drives the moving bracket 1005 to move along the axis of the lead screw 1001. The moving bracket 1005 drives the structure light detector 1006 to move along the axis of the lead screw 1001. During the movement, the structure light detector 1006 located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring to obtain the three-dimensional spatial information of the seat ring. On the one hand, this confirms that the seat ring is in a complete and undamaged state, and on the other hand, it confirms the degree of irregularity of the seat ring surface.

[0048] It should be noted that if the seat ring is found to be damaged or has a high degree of surface irregularity at this time, a brand new seat ring should be replaced and step one should be repeated until it is confirmed that the seat ring being tested is in good condition and the degree of surface irregularity meets the test requirements.

[0049] Step 2: In the control system, the moving distance and deflection angle of the adjustable support arm 2 required for this test are preset. The structure light detector 1006 transmits the three-dimensional spatial information to the control system. After receiving the three-dimensional spatial information, the control system controls the hydraulic cylinder 1105 to start. The hydraulic cylinder 1105 controls the telescopic rod 1103 to move towards the seat ring until the surface of the support ball 1101 makes point contact with the lower surface of the seat ring and plays a supporting role.

[0050] It should be noted that during the seat support process, considering the different installation methods of the seat in real life, the support methods at the lower end of the seat are divided into full support, partial support, and mixed support. For example, the base of a household toilet seat is fixed to the ceramic surface of the toilet, and the cushioning pad fills the irregular gap between the seat and the ceramic to form full support. Car sports seats are only fixed to the frame by a few high-strength bolts at the bottom of the seat, and the rest is suspended to form partial support. The edge of the massage chair seat is fully supported by rigid materials, while the middle part is suspended by airbags and springs, presenting a mixed support overall. Therefore, during the test, the control system does not control all the support components 11 to perform support operations. Instead, the control system controls a different number of support components 11 located below the seat to provide support functions according to the different types of seat. When using mixed support or partial support, some support components 11 located below the seat provide support functions. When using full support, all support components 11 located below the seat provide support functions.

[0051] Furthermore, the control system controls different support components 11 according to the three-dimensional spatial information. The control signals received by the hydraulic cylinders 1105 of different support components 11 are different, resulting in different moving distances of different telescopic rods 1103. Different telescopic rods 1103 drive the support ball 1101 fixedly connected to itself to form point contact with the lower surface of the seat ring and play a supporting role. At this time, the overall appearance of the several support components 11 participating in the support operation is complementary to the lower surface of the seat ring.

[0052] Furthermore, during the process from the point of contact between the support ball 1101 and the lower surface of the seat ring to the point of providing support, the time of this process is extremely short. Therefore, the pressure sensor 1106 detects the instantaneous change in force, which changes abruptly from 0 to a peak value and then drops back to 0. This indicates that at this time, the support ball 1101 is in contact with the lower surface of the seat ring and provides support, generating a rigid impact. During this process, the spring 1104 is compressed and shortened to absorb most of the rigid impact generated by the contact between the support ball 1101 and the seat ring.

[0053] Furthermore, if the lower surface of the seat ring is irregular, the single point of contact between the support ball 1101 and the lower surface of the seat ring may not provide sufficient support. In this case, under rigid impact, the external force on the surface of the support ball 1101 cannot form an effective balance, causing the universal joint 1102 to rotate. As the universal joint 1102 drives the support ball 1101 to rotate, during the continuous rotation of the universal joint 1102, the support ball 1101... The contact position with the seat ring surface is constantly changing until the lower surface of the seat ring forms multiple point contacts with the surface of the support ball 1101 or achieves a stable single-point contact state that meets the load-bearing requirements. The stable single-point or multi-point contact between the support ball 1101 and the seat ring generates a radial force, which cancels out part of the centrifugal force or axial component force when the universal joint 1102 rotates. Therefore, when a stable contact is formed between the support ball 1101 and the seat ring, the universal joint 1102 is restricted from rotating under the action of the radial force. After the seat ring is stably placed, at this time, the pressure sensors 1106 of all support components 11 involved in the support work should detect the same magnitude of force generated by the weight of the seat ring itself.

[0054] Furthermore, if, during partial or mixed support, the irregularity of the lower surface of the seat ring causes the support ball 1101 to be unable to adjust to an effective spatial position under the action of the universal joint 1102, then the corresponding pressure sensor 1106 will be unable to detect the force generated by the weight of the seat ring itself, or the detected force will be less than the force detected by the other pressure sensors 1106. This indicates that there is a support dead angle in the lower part of the seat ring. Therefore, the control system controls the other support components 11 located in the lower part of the seat ring that are not participating in the support work to join the support work, and controls the telescopic rod 1103 of the support component 11 located in the support dead angle to reset and stop working. By changing the support point of the seat ring, the premature breakage phenomenon caused by the lack of support structure at some points on the lower end of the seat ring during partial or mixed support is effectively avoided.

[0055] It should be noted that if the support assembly 11 provides overall support, all support assemblies 11 located below the seat ring provide support functions. A sufficient number of support balls 1101 form point contact with the lower end face of the seat ring. Even if there are support dead corners on the lower end face of the seat ring, a sufficient number of point contacts can distribute the load applied to that area and reduce measurement errors.

[0056] It should be noted that the maximum rotation angle of the universal joint 1102 has been locked in advance to ensure that it will not interfere with other support components 11 during the process of adjusting the spatial position of the support ball 1101.

[0057] Step 3: After the support assembly 11 completes the support of the seat ring, the control system sequentially activates the first drive 7 and the second drive 8. The first drive 7 drives the second lead screw 13 to rotate, which in turn drives the movable seat 12 to move along the axial direction of the lead screw 13. The movable seat 12 then drives the adjustable support arm 2 to move along the axial direction of the lead screw 13. The adjustable support arm 2, in turn, drives the cylinder 1 and the rotatable rubber pad 3 to move along the axial direction of the lead screw 13, thus enabling the rotatable rubber pad 3 to move laterally in a position perpendicular to the frame 4.

[0058] The second drive 8 drives the moving block 20 to move along the sliding groove 18, the moving block 20 drives the sliding base 9 to move along the sliding groove 18, and the sliding base 9 drives the moving shaft 21 to move along the through hole 19, thereby realizing the angle deflection of the adjustable support arm 2, which in turn drives the angle deflection of the cylinder 1 and the rotatable rubber pad 3, thus realizing the adjustment of different test requirements for different specifications of seat rings.

[0059] Furthermore, by implementing a coordinated control strategy for the first drive 7 and the second drive 8 through the control system, the two can operate synchronously. By precisely setting the motion parameters and time sequence of the dual drive system, the adjustable support arm 2 can perform a composite motion of lateral translation and angle change, providing diversified and precise motion condition simulation for seat ring testing.

[0060] Furthermore, by implementing a coordinated control strategy for the first drive 7 and the second drive 8 through the control system, the adjustable support arm 2 can be adjusted at different positions on the surface of the seat ring of the same specification, thereby increasing the load range that can be selected for testing.

[0061] Step 4: Start cylinder 1. Cylinder 1 drives the rotatable rubber pad 3 to move towards the seat ring until it is close to the upper surface of the seat ring and maintains a certain distance.

[0062] It should be noted that the inner diameter of cylinder 1 is 50.8mm and the stroke is 127mm. These two parameters determine the power output range and movement amplitude of cylinder 1.

[0063] Furthermore: In step four, the distance between the rotatable rubber pad 3 and the upper surface of the seat ring is determined by the type of test to be performed at this time.

[0064] Furthermore: Input the power output range and motion amplitude of cylinder 1 required for this test into the control system.

[0065] Step 5: Start cylinder 1, which drives the rotatable rubber pad 3 to apply a load to the upper surface of the seat ring in order to test the performance of the seat ring under load, such as sway stability, yield strength and other physical properties.

[0066] Step Six: After completing Step Five above, the control system restarts the third drive 1007. The third drive 1007 drives the lead screw 1001 to rotate. The lead screw 1001 drives the moving bracket 1005 to move along the axis of the lead screw 1001. The moving bracket 1005 drives the structure light detector 1006 to move along the axis of the lead screw 1001. During the movement, the structure light detector 1006 located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring, obtaining the three-dimensional spatial information of the seat ring for the second time.

[0067] Furthermore, the control system compares and analyzes the three-dimensional spatial information of the seat ring obtained in the second step with the three-dimensional spatial information of the seat ring obtained in step one to determine whether the seat ring has experienced structural fracture during the operation in step five.

[0068] According to the above technical solution, the following specific functions are included:

[0069] Function 1: After completing step one, input the moving distance and deflection angle of the adjustable support arm 2 required for testing the rocking stability of the seat ring into the control system. The control system controls the support assembly 11 to complete step two. Subsequently, the control system controls the first drive 7 and the second drive 8 to complete step three. Input the power output range and movement amplitude required for the cylinder 1 to perform the rocking stability test into the control system. The cylinder 1 completes step four. Drive the cylinder 1 to alternately apply load to both sides of the seat ring. Each load application lasts for 1 second, with an interval of 0.5 seconds before applying load to the other side. This cycle is repeated to test the rocking stability of the seat ring.

[0070] During the process of applying load to cylinder 1, the load on the seat ring is transmitted downward to the support ball 1101. As a rigid structure, the force of the support ball 1101 is transmitted downward to the telescopic rod 1103, the force of the telescopic rod 1103 is transmitted downward to the hydraulic cylinder 1105, and the force of the hydraulic cylinder 1105 is transmitted downward to the pressure sensor 1106.

[0071] During the elastic cycle phase of the seat ring, the pressure sensor 1106 shows that the load increases linearly and gradually stabilizes. After unloading, the force returns to 0. During this process, the seat ring has good sway stability, and the drive cylinder 1 gradually applies a larger load to the seat ring.

[0072] When the pressure sensor 1106 detects a linear increase in force during the application of load, provided the seat ring is undamaged, the force will increase linearly. When the seat ring breaks due to excessive load, the original load-bearing path of the external load is disrupted at the moment of breakage, and the stress at the breakage point is rapidly released. The value detected by the pressure sensor 1106 will suddenly drop to 0. At this time, the control system ends step five and enters step six to confirm the breakage of the seat ring and record the load applied by cylinder 1 at the time of breakage. This value is the maximum load that satisfies the rocking stability of the seat ring.

[0073] Function 2: Replace the damaged seat ring from Function 1 with a brand new seat ring. After completing step 1, input the moving distance and deflection angle of the adjustable support arm 2 required for testing the yield strength of the seat ring into the control system. At this time, the deflection angle of the adjustable support arm 2 is 0, so that the support arm 2 can be adjusted to maintain a perpendicular position to the seat ring during this test. The control system controls the support assembly 11 to complete step 2. Subsequently, the control system controls the first drive 7 to complete step 3. Input the power output range and movement amplitude required for the cylinder 1 to perform the yield strength test into the control system. At this time, the rubber pad 303 is in contact with the surface of the seat ring. The cylinder 1 completes step 4, driving the cylinder 1 to apply a load to both sides of the seat ring and keeping the adjustable support arm 2 stationary. That is, the load applied at this time is a static load.

[0074] During the process of applying load to cylinder 1, the load transmission principle in support assembly 11 is the same as the load transmission principle in function one, and will not be elaborated further here.

[0075] During the elastic deformation stage of the seat ring, the seat ring deforms downward under the action of load. The seat ring pushes the support ball 1101 to move downward, and the support ball 1101 pushes the telescopic rod 1103 to move downward. When the displacement sensor 15 detects that the telescopic rod 1103 has moved downward, the control system controls the cylinder 1 to stop applying the load and controls the rotatable rubber pad 3 to disengage from the surface of the seat ring. The control system records the load value applied by the cylinder 1 at this time.

[0076] Before starting step six, keep the seat ring stationary for a period of time. During this stationary period, if the surface state of the seat ring changes, that is, if the surface state of the seat ring gradually returns to the state before the cylinder 1 applied the load, it indicates that the applied load caused elastic deformation of the seat ring. If the surface state does not change, it indicates that the applied load caused plastic deformation of the seat ring. At this time, the change in the surface state of the seat ring may not be visible to the naked eye. Changes that cannot be observed to the naked eye need to be further detected in step six. Changes that are visible to the naked eye, such as obvious fracture of the seat ring surface, that is, the seat ring surface skips the plastic deformation stage and fractures, or the plastic deformation stage occurs for a very short time, making it difficult to detect, can omit step six. By querying the load value applied by cylinder 1 at this time recorded by the control system, the maximum value that satisfies the yield strength can be obtained.

[0077] If the seat ring undergoes a surface change that is not visible to the naked eye, proceed to step six. If the three-dimensional spatial information obtained in step six is ​​the same as that obtained in step one, the position of the telescopic rod 1103 is detected again by the displacement sensor 15. If it is the same as the position after step two, it indicates that the load of this magnitude has not reached the yield strength.

[0078] Continue to increase the load applied by cylinder 1 and repeat the operation of function two above. Each time function two is repeated, gradually increase the load applied by cylinder 1. After each load application is stopped, let the seat ring stand still for a period of time. On the one hand, wait for the surface state change of the seat ring to end, and on the other hand, wait for the residual vibration of the load to completely decay. Since the working principle of the structure light detector 1006 is to project a specific pattern of structure light onto the surface of the object being tested, collect the deformation pattern and calculate the three-dimensional spatial information, the stable state of the object being tested has a great influence on the calculation of the three-dimensional spatial information. Therefore, it is necessary to wait for the residual vibration of the load to completely decay to avoid errors caused by vibration in the subsequent test. Until the three-dimensional spatial information obtained in step six is ​​different from the three-dimensional spatial information obtained in step one, that is, the upper surface of the seat ring is concave, the position of the telescopic rod 1103 is detected again by the displacement sensor 15. If the position of the telescopic rod 1103 remains unchanged after the cylinder 1 stops applying the load, it means that the load of this size causes plastic deformation of the seat ring, that is, the concave surface of the seat ring appears. It means that the load of this size is the maximum load that meets the yield strength of the seat ring.

[0079] Furthermore, analyzing the degree of indentation on the upper surface of the seat ring can yield various physical information about the seat ring material, such as the material's hardness value. That is, when a constant load is applied to the material surface, the greater the indentation depth, the lower the material hardness. At the same time, if no cracks appear at the edge of the indentation and the material remains intact as the depth increases, it indicates that its ductility is good. Conversely, shallow indentations and cracks indicate that the material is brittle.

[0080] Furthermore, by analyzing the absolute deformation of seat rings of different thicknesses under load, i.e. the difference in dimensions before and after deformation, we can determine the thickness range that meets the stiffness requirements while minimizing weight, thus saving production costs. By using test structures of different thicknesses under the same load conditions, we can collect relevant absolute deformation data and construct thickness quality inspection standards, including but not limited to seat ring structures.

[0081] Furthermore, after the seat ring undergoes plastic deformation, the load applied by cylinder 1 is increased until the plastic deformation area fractures. The method for detecting fracture is the same as the method for detecting fracture in Function 1, and will not be elaborated further here. After fracture occurs, step six is ​​performed again to obtain new three-dimensional spatial information. By comparing it with the three-dimensional spatial information obtained in step one, the degree of necking of the seat ring fracture and the symmetry of deformation can be detected. The difference between the necking diameter and the original diameter of the seat ring is the maximum amount of plastic deformation. At the same time, if the degree of necking at both ends of the fracture is asymmetrical, it may be due to loading bias or reflect the anisotropy of the material. Load bias indicates that the load line acting on the seat ring does not coincide with the material axis, resulting in non-uniform stress. Material anisotropy refers to the difference in mechanical properties of the material in different directions, which may lead to preferential failure in the weak direction when subjected to load.

[0082] It should be noted that during the operation of Function 1 and Function 2, the spring 1104 absorbs part of the load during the load transfer process to protect the overall structure of the support assembly 11 from damage. This results in the pressure sensor 1106 collecting an incorrect value. However, the specific load value collected by the pressure sensor 1106 does not affect the realization of the above two functions. As long as the load change pattern collected by the pressure sensor 1106 meets the description of the above functions, the operation can proceed to the next stage.

[0083] It should be noted that during the operation of Function 2, the universal joint 1102 drives the support ball 1101 to rotate and adjust the spatial position. As a result, during the operation of Function 2, the rotation of the universal joint 1102 ensures the continuity of external load transmission, reduces the displacement error of the telescopic rod 1103 caused by the loss during load transmission, makes the displacement data collected by the displacement sensor 15 more accurate, and reduces the error during the deformation of the seat ring.

[0084] Function 3: After the test of Function 1 is completed, the tested seat ring breaks. Therefore, before conducting the test of Function 2, a seat ring of the same specification needs to be replaced. The maximum load finally detected in Function 1 is recorded as the first standard load. The moving distance and deflection angle of the support assembly 11 and the adjustable support arm 2 are kept in the working position in Function 1. The cylinder 1 is activated, and the cylinder 1 drives the rotatable rubber pad 3 to directly apply the first standard load to the support ball 1101. The transmission principle of the first standard load in the support assembly 11 is the same as the load transmission principle in Function 1, which will not be elaborated here. The load on the pressure sensor 1106 at this time is recorded as the first test load. The difference between the first test load and the first standard load is compared. If the difference between the first test load and the first standard load is less than... This indicates that the rotatable rubber pad 3 is in good working condition. If the difference between the first test load and the first standard load is greater than or equal to... Specifically, the first test load is less than the first standard load. Since wear will significantly reduce the energy transfer efficiency between the contact interfaces of objects, it indicates that the contact surface between the rotatable rubber pad 3 and the seat ring wears during the alternating load process of function one.

[0085] Furthermore, when it is determined that the rotatable rubber pad 3 is worn, several control systems control the support assembly 11 to reset. The control system inputs the required movement distance and deflection angle of the adjustable support arm 2 for function two. At this time, the deflection angle of the adjustable support arm 2 is 0, so that the support arm 2 can be adjusted to maintain a vertical position relationship with several support assemblies 11. The rotatable rubber pad 3 is controlled to contact the support ball 1101. The control system inputs the power output range and movement amplitude required for the cylinder 1 to perform the yield strength test, so that the rotatable rubber pad 3 directly applies a load to the support ball 1101. This load is recorded as the second standard load. The transmission principle of the second standard load in the support assembly 11 is the same as the load transmission principle in function one, which will not be elaborated here. The load on the pressure sensor 1106 at this time is recorded as the second test load. Due to the wear on the surface of the rotatable rubber pad 3 and the energy loss during the load transmission process, the magnitude of the second test load should be much smaller than the load applied by the cylinder 1.

[0086] To eliminate errors caused by wear of the rotatable rubber pad 3, the power output range and movement amplitude of the cylinder 1 can be appropriately increased, so that the rotatable rubber pad 3 directly applies a larger load to the support ball 1101, which is recorded as the third standard load. The load on the pressure sensor 1106 under this condition is recorded as the third test load. The difference between the third test load and the second standard load is compared until the difference between the third test load and the second standard load is less than... This indicates that the energy loss caused by the wear of the rotatable rubber pad 3 surface has been compensated, and the third test load is used as the initial load for function two.

[0087] Furthermore, although the seat ring with a high degree of irregularity has been replaced in step one, there are still fine pits or protrusions on the surface of the seat ring. Therefore, when a static load is applied to the surface of the seat ring, the protruding parts of the worn rotatable rubber pad 3 form non-uniform point contact with the pits or protrusions on the surface of the seat ring, reducing the effective contact area. The reduction of the effective contact area will lead to the concentration of local stress, which can easily lead to the accelerated initiation of cracks. Especially at the bottom of the pit on the surface of the seat ring, the relative thickness at the bottom of the pit is small and the stress concentration is large, which makes it easy for premature fracture to occur at the pit position on the surface of the seat ring, causing test errors. At the same time, the edge of the pit will undergo fatigue spalling due to repeated high stress, forming new wear particles, which will aggravate the occurrence of cracks and expand the range and depth of the pit, creating a vicious cycle.

[0088] Furthermore, the control system controls cylinder 1 to divide the single load required for the test into multiple cyclic progressive loading stages, i.e., a loading-unloading-loading cycle, with each stage load increasing in intensity compared to the previous stage. Each stage is spaced 5 seconds apart until the final stage load reaches the test requirement. In each cycle, the plastic deformation self-compensation effect during staged loading is utilized to partially fill the pits, with the filling amount reaching 20-30% of the wear depth.

[0089] Furthermore, after each unloading, the detection component 10 is activated, and the structured light detector 1006 scans the surface of the seat ring to observe whether the pits on the seat ring surface have enlarged. If the diameter of the pits on the seat ring surface increases within 20 cycles, the detection is successful. Or when the diameter of the pit on the seat surface increases within 50 cycles. This indicates that the vicious cycle has accelerated. At the same time, due to fatigue spalling caused by repeated high stress on the edge of the pit, new wear particles are constantly formed. These wear particles cause additional wear to the inside of the pit. Therefore, the expansion of the pit edge is inevitably accompanied by the deepening of the pit. When the vicious cycle accelerates, it is determined that the surface environment and local relative thickness of the seat ring no longer meet the test requirements and need to be replaced.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0091] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional swing fatigue testing machine, comprising a control system and a support assembly (11), characterized in that: Each set of support components (11) includes a pressure sensor (1106), with a hydraulic cylinder (1105) fixedly mounted on the upper end of the pressure sensor (1106). A telescopic rod (1103) is connected to the upper end of the hydraulic cylinder (1105), and a universal joint (1102) is mounted on the upper end of the telescopic rod (1103). A support ball (1101) is connected to the upper end of the universal joint (1102). A spring (1104) is sleeved on the shaft of the telescopic rod (1103). The upper end of (1104) is fixedly connected to the telescopic rod (1103), and the lower end of the spring (1104) is fixedly connected to the hydraulic cylinder (1105). A displacement sensor (15) is fixedly installed inside the hydraulic cylinder (1105). A frame (4) is fixedly installed at the lower end of the support assembly (11). A rectangular groove is opened at the upper end of the frame (4). Several support assemblies (11) are fixedly installed inside the rectangular groove. A detection device is fixedly installed at the upper end of the frame (4). Component (10), the detection component (10) includes a second sliding track (1003), each set of the second sliding track (1003) has a support column (1002) fixedly installed at the upper end, each set of the support column (1002) has a first sliding track (1004) fixedly installed at the upper end, each set of the first sliding track (1004) and each set of the second sliding track (1003) has a groove (16) on one side near the support component (11), and the inside of the groove (16) is provided with Screw 1 (1001), each set of screw 1 (1001) is provided with a gantry frame (6) on the outside, and two sets of moving slots (17) are provided at the bottom of the crossbeam of the gantry frame (6). Screw 2 (13) is provided inside each set of moving slots (17). Each set of screw 2 (13) is connected to a moving seat (12) by a thread on the shaft. The moving seat (12) is connected by a hinge to an angle adjustment mechanism consisting of an adjustable support arm (2), a moving block (20), a moving shaft (21) and a sliding base (9).

2. The multifunctional swing fatigue testing machine according to claim 1, characterized in that: The lower end of the pressure sensor (1106) is fixedly connected to the bottom of the rectangular groove, and a steel platform (5) is fixedly installed on the upper end of the frame (4).

3. The multifunctional swing fatigue testing machine according to claim 2, characterized in that: The sliding rails (1003) are symmetrically arranged at both ends of the support assembly (11), and each set of sliding rails (1003) is fixedly installed on the upper end of the frame (4).

4. The multifunctional swing fatigue testing machine according to claim 3, characterized in that: One end of each set of lead screw one (1001) is connected to the bearings of the corresponding sliding rail one (1004) and sliding rail two (1003). The other end of each set of lead screw one (1001) is fixedly connected to a third drive (1007). Each set of third drives (1007) is fixedly installed on the outer end of the sliding rail one (1004) and the sliding rail two (1003). Each set of lead screw one (1001) is fitted with a movable bracket (1005). Each set of movable brackets (1005) has an installation platform in the middle position. Each set of installation platforms has a structure light detector (1006) fixedly installed on the opposite side.

5. A multifunctional swing fatigue testing machine according to claim 4, characterized in that: The gantry (6) is fixedly installed at both ends of the outer side of the frame (4).

6. A multifunctional swing fatigue testing machine according to claim 5, characterized in that: Two sets of lead screws (13) are connected at one end to the bearing of the gantry frame (6). The other end of each set of lead screws (13) is fixedly connected to a first drive (7). The first drive (7) is fixedly installed on the outer ends of the two side columns of the gantry frame (6). Sliding grooves (18) are provided on the front and rear surfaces of the two side columns of the gantry frame (6). A moving block (20) is fixedly installed inside the sliding groove (18). A second drive (8) is fixedly installed on the outer ends of the two side columns of the gantry frame (6). The second drive (8) is connected to the moving block (20).

7. A multifunctional swing fatigue testing machine according to claim 6, characterized in that: The movable seat (12) is hinged to an adjustable support arm (2). The lower end of the adjustable support arm (2) is fixedly connected to a cylinder (1). The lower end of the cylinder (1) is connected to a rotatable rubber pad (3). The rotatable rubber pad (3) includes an adapter (301). The lower end of the adapter (301) is connected to a rotating part (302). The lower end of the rotating part (302) is fixedly installed with a rubber pad (303).

8. A multifunctional swing fatigue testing machine according to claim 7, characterized in that: An installation platform (14) is fixedly installed on the shaft of the adjustable support arm (2). The installation platform (14) has a moving shaft (21) machined on the two sides parallel to the front and rear sides of the gantry frame (6).

9. A multifunctional swing fatigue testing machine according to claim 8, characterized in that: Each set of moving shafts (21) is provided with a sliding base (9) at one end away from the gantry frame (6). The sliding base (9) is provided with a through hole (19) on one side away from the gantry frame (6), and the moving shafts (21) are all fitted into the through hole (19).

10. A method of using a multifunctional swing fatigue testing machine, implemented according to claim 9, characterized in that: Step 1: Before the test begins, a portion of the seat ring is fixedly installed on the upper end of the steel platform (5). At this time, the rest of the seat ring is suspended and located above several support components (11). After the vibration caused by the impact during the installation of the seat ring has completely decayed, the third drive (1007) is started. The third drive (1007) drives the lead screw (1001) to rotate. The lead screw (1001) drives the moving bracket (1005) to move along the axis of the lead screw (1001). The moving bracket (1005) drives the structure light detector (1006) to move along the axis of the lead screw (1001). During the movement, the structure light detector (1006) located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring to obtain the three-dimensional spatial information of the seat ring. On the one hand, it confirms that the seat ring is in a complete and undamaged state at this time, and on the other hand, it confirms the degree of irregularity of the surface of the seat ring. Step 2: After confirming that the seat ring is in an undamaged state, the adjustable support arm (2) is preset in the control system to determine the moving distance and deflection angle required for this test. The structured light detector (1006) transmits the three-dimensional spatial information to the control system. After receiving the three-dimensional spatial information, the control system starts the hydraulic cylinder (1105). The hydraulic cylinder (1105) controls the telescopic rod (1103) to move closer to the seat ring until the surface of the support ball (1101) makes point contact with the lower surface of the seat ring and provides support. The support method is adjusted according to the different requirements of different specifications and types of seat rings. Step 3: After the support component (11) completes the support of the seat ring, the control system starts the first drive (7) and the second drive (8) in sequence. The first drive (7) drives the second lead screw (13) to rotate. The second lead screw (13) drives the moving seat (12) to move along the axis of the second lead screw (13). The moving seat (12) drives the adjustable support arm (2) to move along the axis of the second lead screw (13). The adjustable support arm (2) drives the cylinder (1) and the rotatable rubber pad (3) to move along the axis of the second lead screw (13), so that the rotatable rubber pad (3) can move laterally in a state perpendicular to the frame (4). The second drive (8) drives the moving block (20) to move along the sliding groove (18), the moving block (20) drives the sliding base (9) to move along the sliding groove (18), and the sliding base (9) drives the moving shaft (21) to move along the through hole (19), thereby realizing the angle deflection of the adjustable support arm (2), which in turn drives the angle deflection of the cylinder (1) and the rotatable rubber pad (3), thus realizing the adjustment of different test requirements for seat rings of different specifications; When measuring the rocking stability of the seat ring, the adjustable support arm (2) is tilted at a certain angle to the surface of the seat ring. When measuring the yield strength of the seat ring, the adjustable support arm (2) is kept perpendicular to the surface of the seat ring. Step 4: When the position of the rotatable rubber pad (3) reaches the required position for the test, start the cylinder (1). The cylinder (1) drives the rotatable rubber pad (3) to move towards the seat ring until it is close to the upper surface of the seat ring and maintains a certain distance. Step 5: Start the cylinder (1), and the cylinder (1) drives the rotatable rubber pad (3) to apply a load to the upper surface of the seat ring to test the performance of the seat ring under load. When measuring the swaying stability of the seat ring, drive the cylinder (1) to alternately apply the load to both sides of the seat ring. Each load application time is 1s, and after an interval of 0.5s, apply the load to the other side. Repeat this cycle to test the swaying stability of the seat ring. When measuring the yield strength of the seat ring, drive the cylinder (1) to apply the load to both sides of the seat ring, and keep the adjustable support arm (2) always stationary. That is, the load applied at this time is a static load. Step Six: The control system restarts the third drive (1007), which drives the lead screw (1001) to rotate. The lead screw (1001) drives the moving bracket (1005) to move along the axial direction of the lead screw (1001). The moving bracket (1005) drives the structure light detector (1006) to move along the axial direction of the lead screw (1001). During the movement, the structure light detector (1006) located on the upper and lower sides of the seat ring scans the upper and lower surfaces of the seat ring and obtains the three-dimensional spatial information of the seat ring for the second time. The control system compares and analyzes the three-dimensional spatial information of the seat ring obtained in the second time with the three-dimensional spatial information of the seat ring obtained in Step One to determine whether the seat ring has experienced structural fracture during the operation in Step Five.

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