Multifunctional swing fatigue testing machine and testing method

Abstract

The invention discloses a multifunctional swing fatigue testing machine and a testing method, and is applied to the technical field of swing testing, 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 provided with a hydraulic cylinder, and the upper end of the hydraulic cylinder is fixedly connected with a telescopic rod; a universal joint is fixedly installed at the upper end of the telescopic rod, a supporting ball is fixedly installed at the upper end of the universal joint, a shaft body of the telescopic rod is sleeved with a spring, the upper end of the spring is fixedly connected with the telescopic 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 seat ring support device has the characteristic of realizing stable support of to-be-tested seat rings of different types and specifications.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of swing test, in particular to a multifunctional swing fatigue testing machine and test method. BACKGROUND

[0002] The swing fatigue testing machine is a device for simulating the stress state of an object in a swing, tilt or vibration environment, and testing the reliability, durability or adaptability of a product by controlling parameters such as swing angle, frequency and load.

[0003] Under the prior art, the swing fatigue testing machine is often of an integrated structure, and a single support platform is used to support the seat ring to be tested on the testing machine. However, the existing seat rings differ greatly in types and specifications, and the single support platform often cannot meet the testing requirements.

[0004] Therefore, it is necessary to design a multifunctional swing fatigue testing machine and test method capable of meeting different specifications and types of seat rings. SUMMARY

[0005] The present application aims to provide a multifunctional swing fatigue testing machine and test method to solve the problems in the background art.

[0006] To solve the above technical problems, the present application provides the following technical solution: a multifunctional swing fatigue testing machine and test method, comprising a control system and a support assembly, each support assembly comprising a pressure sensor, the upper end of the pressure sensor being fixedly installed with a hydraulic cylinder, the upper end of the hydraulic cylinder being connected with an extension rod, the upper end of the extension rod being installed with a universal joint, the upper end of the universal joint being connected with a support ball, a spring being sleeved on the shaft of the extension rod, the upper end of the spring being fixedly connected with the extension rod, the lower end of the spring being fixedly connected with the hydraulic cylinder, a displacement sensor being fixedly installed in the hydraulic cylinder, and the lower end of the support assembly being fixedly installed with a rack.

[0007] According to the above technical solution, the upper end of the rack is provided with a rectangular groove, a plurality of support assemblies are fixedly installed in the rectangular groove, the lower end of the pressure sensor is fixedly connected with the bottom of the rectangular groove, a steel platform is fixedly installed at the upper end of the rack, and a detection assembly is fixedly installed at the upper end of the rack.

[0008] According to the above technical solution, the detection assembly comprises a second sliding rail, the second sliding rail is symmetrically arranged at both ends of the support assembly, each second sliding rail is fixedly installed at the upper end of the rack, each second sliding rail is fixedly installed with a support column at the upper end, each support column is fixedly installed with a first sliding rail at the upper end, and the first sliding rail and the second sliding rail of each group are provided with a groove on one side face close to the support assembly.

[0009] According to the technical scheme, the inside of the groove is provided with a lead screw one, one end of each group of the lead screw one is bearing-connected with the corresponding sliding rail one and the sliding rail two, the other end of each group of the lead screw one is fixedly connected with a third drive, each group of the third drive is fixedly installed at the outer end of the sliding rail one and the sliding rail two, each group of the lead screw one is sleeved with a moving support, the middle position of each group of the moving support is provided with an installation platform, and the opposite side of each group of the installation platform is fixedly installed with a structured light detector.

[0010] According to the technical scheme, the outside of each group of the lead screw one is provided with a gantry, and the gantry is fixedly installed at the outer ends of the rack.

[0011] According to the technical scheme, the bottom of the cross beam of the gantry is provided with two groups of moving grooves, the inside of each group of the moving grooves is provided with a lead screw two, one end of the two groups of the lead screw two close to each other is bearing-connected with the gantry, the other end of each group of the lead screw two is fixedly connected with a first drive, the first drive is fixedly installed at the outer end of the two side columns of the gantry, the front and back surfaces of the two side columns of the gantry are provided with sliding grooves, the inside of the sliding grooves is fixedly installed with a moving block, the outer end of the two side columns of the gantry is fixedly installed with a second drive, and the second drive is connected with the moving block.

[0012] According to the technical scheme, the shaft of each group of the lead screw two is threadedly connected with a moving seat, the moving seat is hingedly connected with an adjustable support arm, the lower end of the adjustable support arm is fixedly connected with an air cylinder, the lower end of the air cylinder is connected with a rotatable rubber pad, the rotatable rubber pad comprises a adapter, the lower end of the adapter is connected with a rotating piece, and the lower end of the rotating piece is fixedly installed with a rubber pad.

[0013] According to the technical scheme, the shaft of the adjustable support arm is fixedly installed with an installation table, and the installation table is machined with moving shafts on the two side surfaces parallel to the front and back two side surfaces of the gantry.

[0014] According to the technical scheme, the end, away from the gantry, of each group of the moving shafts is provided with a sliding base, one side of the sliding base, away from the gantry, is provided with a through hole, and the moving shafts are sleeved in the through hole.

[0015] A multifunctional swing fatigue testing machine using method, comprising:

[0016] Step one: before the test, the seat ring part area is fixedly installed on the upper end of the steel platform, at this time the remaining part of the seat ring is in a suspended state and is located above a plurality of support assemblies, after the seat ring vibration caused by the impact during installation is completely attenuated, the third drive is started, the third drive drives the rotation of the lead screw one, the lead screw one drives the movement of the moving support along the axial direction of the lead screw one, the moving support drives the movement of the structured light detector along the axial direction of the lead screw one, during the movement, the structured light detectors located on the upper and lower sides of the seat ring scan the upper and lower surfaces of the seat ring to obtain the three-dimensional space information of the seat ring, on the one hand, it is confirmed that the seat ring at this time belongs to the intact state, on the other hand, it is confirmed that the irregular degree of the surface of the seat ring;

[0017] Step two: after confirming that the seat ring belongs to the intact state, the moving distance and the deflection angle of the adjustable support arm required by the test are preset in the control system, the structured light detector transmits the three-dimensional space information to the control system, after receiving the three-dimensional space information, the control system controls the hydraulic cylinder to start, the hydraulic cylinder controls the movement of the telescopic rod to the direction close to the seat ring, until the surface of the support ball forms a point contact with the lower surface of the seat ring and plays a supporting role, according to the different requirements of different specifications and types of seat rings, the supporting mode is adjusted;

[0018] Step three: after the support assembly completes the supporting link of the seat ring, the control system starts the first drive and the second drive in sequence, the first drive drives the rotation of the lead screw two, the lead screw two drives the movement of the moving seat along the axial direction of the lead screw two, the moving seat drives the movement of the adjustable support arm along the axial direction of the lead screw two, the adjustable support arm drives the movement of the cylinder and the rotatable rubber pad along the axial direction of the lead screw two, realizing the transverse movement of the rotatable rubber pad in the state of being perpendicular to the rack;

[0019] The second drive drives the movement of the moving block along the sliding groove, the moving block drives the movement of the sliding base along the sliding groove, the sliding base drives the movement of the moving shaft along the through hole, realizing the angular deflection of the adjustable support arm, and further driving the angular deflection of the cylinder and the rotatable rubber pad, realizing the adjustment of different test requirements of different specifications of seat rings;

[0020] When measuring the rocking stability of the seat ring, the adjustable support arm has a certain inclination angle with the surface of the seat ring, and when measuring the yield strength of the seat ring, the adjustable support arm maintains a perpendicular position relationship with the surface of the seat ring;

[0021] Step four: when the position of the rotatable rubber pad reaches the required position of the test, the cylinder is started, the cylinder drives the movement of the rotatable rubber pad to the direction of the seat ring, until it is close to the upper surface of the seat ring and keeps a certain distance.

[0022] Step five: start the air cylinder, the air cylinder drives the rotatable rubber pad to apply load to the upper surface of the seat ring, to test the performance of the seat ring under load, when measuring the rocking stability of the seat ring, the air cylinder is driven to alternately apply load to both sides of the seat ring, each time the load is applied for 1s, and the other side is applied after 0.5s, and the cycle is repeated to test the rocking stability of the seat ring, when measuring the yield strength of the seat ring, the air cylinder is driven to apply load to both sides of the seat ring, and the adjustable support arm is kept stationary at all times, that is, the load applied at this time is static load;

[0023] Step six: the control system starts the third drive again, the third drive drives the screw rod to rotate, the screw rod drives the moving bracket to move along the axial direction of the screw rod, and the moving bracket drives the structured light detector to move along the axial direction of the screw rod, in the moving process, the structured light detectors located on the upper and lower sides of the seat ring scan the upper and lower surfaces of the seat ring, and the three-dimensional space information of the seat ring is obtained for the second time, the control system compares and analyzes the three-dimensional space information of the seat ring obtained for the second time with the three-dimensional space information of the seat ring obtained in step one, to determine whether the structure of the seat ring is broken in the operation process of step five.

[0024] Compared with the prior art, the present application has the advantages that: by setting the support assembly, the seat ring structure with different specifications, different types and different support modes can be stably supported on the test platform. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application and constitute a part of the specification, which together with the embodiments of the application, serve to explain the application, and do not constitute a limitation on the application. In the drawings:

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

[0027] Figure 2 is a schematic diagram of the overall structure of the present application;

[0028] Figure 3 is a schematic diagram of the support assembly structure of the present application;

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

[0030] Figure 5 is a schematic diagram of the gantry structure of the present application;

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

[0032] Figure 7 is a schematic diagram of a support assembly structure of the present application;

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

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

[0035] In the figure: 1, cylinder; 2, adjustable support arm; 3, rotatable rubber pad; 301, adapter; 302, rotating part; 303, rubber pad; 4, rack; 5, steel platform; 6, gantry; 7, first drive; 8, second drive; 9, sliding base; 10, detection assembly; 1001, screw rod one; 1002, support column; 1003, sliding rail two; 1004, sliding rail one; 1005, moving bracket; 1006, structured light detector; 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, screw rod two; 14, mounting table; 15, displacement sensor; 16, groove; 17, moving groove; 18, sliding groove; 19, through hole; 20, moving block; 21, moving shaft. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Please refer to Figures 1-9 The present application provides a technical solution: a multifunctional swing fatigue testing machine and a test method, comprising a control system and a rack 4, a rectangular groove is formed at the upper end of the rack 4, a plurality of support assemblies 11 are fixedly installed inside the rectangular groove, gantries 6 are fixedly installed at the outer sides of both ends of the rack 4, a detection assembly 10 is fixedly installed at the upper end of the rack 4, a steel platform 5 is fixedly installed at the upper end of the rack 4, and the steel platform 5 is used to fixedly install the seat ring to be tested.

[0038] Each group of support assemblies 11 comprises a pressure sensor 1106, the lower end of the pressure sensor 1106 is fixedly connected with the bottom of the rectangular groove, the upper end of the pressure sensor 1106 is fixedly installed with a hydraulic cylinder 1105, the upper end of the hydraulic cylinder 1105 is connected with a telescopic rod 1103, the upper end of the telescopic rod 1103 is installed with a universal joint 1102, the upper end of the universal joint 1102 is connected with a support ball 1101, the shaft of the telescopic rod 1103 is sleeved with a spring 1104, the upper end of the spring 1104 is fixedly connected with the telescopic rod 1103, the lower end of the spring 1104 is fixedly connected with the hydraulic cylinder 1105, and the inside of the hydraulic cylinder 1105 is fixedly installed with a displacement sensor 15.

[0039] The detection assembly 10 comprises a sliding rail two 1003, the sliding rail two 1003 is symmetrically arranged at both ends of the support assembly 11, each group of sliding rail two 1003 is fixedly installed at the upper end of the rack 4, the upper end of each group of sliding rail two 1003 is fixedly installed with a support column 1002, the upper end of each group of support column 1002 is fixedly installed with a sliding rail one 1004, each group of sliding rail one 1004 and each group of sliding rail two 1003 are provided with a groove 16 on the side close to the support assembly 11, each group of groove 16 is provided with a lead screw one 1001 inside, one end of each group of lead screw one 1001 is connected with the bearing of the corresponding sliding rail one 1004 and sliding rail two 1003, the other end of each group of lead screw one 1001 is fixedly connected with a third drive 1007, each group of third drive 1007 is fixedly installed at the outer end of the sliding rail one 1004 and the sliding rail two 1003, each group of lead screw one 1001 is sleeved with a moving bracket 1005 on the shaft, each group of moving bracket 1005 is provided with an installation platform at the middle position, the opposite side of each group of installation platform is fixedly installed with a structured light detector 1006, the structured light detector 1006 at the upper and lower ends of the seat scans and detects the overall surface of the seat, and forms a three-dimensional space model.

[0040] The bottom of the portal frame 6 is provided with two groups of moving grooves 17, each group of moving grooves 17 is provided with a lead screw two 13 inside, the ends close to each other of the two groups of lead screw two 13 are connected with the bearing of the portal frame 6, the other end of each group of lead screw two 13 is fixedly connected with the first drive 7, the first drive 7 is fixedly installed at the outer end of the two side columns of the portal frame 6, the front and rear surfaces of the two side columns of the portal frame 6 are provided with a sliding groove 18, the sliding groove 18 is fixedly installed with a moving block 20 inside, the outer end of the two side columns of the portal frame 6 is fixedly installed with a second drive 8, and the second drive 8 is connected with the moving block 20.

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

[0042] The shaft of each group of lead screws two 13 is threadedly connected with a moving seat 12, the moving seat 12 is hingedly connected with an adjustable support arm 2, the lower end of the adjustable support arm 2 is fixedly connected with a gas cylinder 1, the lower end of the gas cylinder 1 is connected with a rotatable rubber pad 3, the rotatable rubber pad 3 comprises a adapter 301, the lower end of the adapter 301 is connected with a rotating piece 302, and the lower end of the rotating piece 302 is fixedly installed with a rubber pad 303.

[0043] The shaft of the adjustable support arm 2 is fixedly installed with a mounting table 14, and the mounting table 14 is machined with a moving shaft 21 on the two side surfaces parallel to the front and rear side surfaces of the gantry 6.

[0044] The end of each group of moving blocks 20 away from the gantry 6 is fixedly installed with a sliding base 9, a through hole 19 is formed in the side surface of the sliding base 9 away from the gantry 6, and 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 the embodiment,

[0047] Step one: before opening, the seat ring part is fixedly installed on the upper end of the steel platform 5, at this time, the remaining part of the seat ring is in a suspended state and is located above the support assembly 11, after waiting for the seat ring to be completely attenuated due to the shock generated in the installation process, the third drive 1007 is started, the third drive 1007 drives the lead screw one 1001 to rotate, the lead screw one 1001 drives the moving support 1005 to move along the axial direction of the lead screw one 1001, the moving support 1005 drives the structured light detector 1006 to move along the axial direction of the lead screw one 1001, and in the moving process, the structured 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 three-dimensional space information of the seat ring, which confirms that the seat ring belongs to an intact state and confirms the irregularity degree of the surface of the seat ring.

[0048] It should be noted that if the seat ring is detected to be in a damaged state or the surface irregularity degree is high at this time, a brand new seat ring should be replaced to repeat step one until the seat ring detected is confirmed to be in an intact state and the surface irregularity degree meets the test requirements.

[0049] Step two: the moving distance and deflection angle of the adjustable support arm 2 required for this test are preset in the control system, the structured light detector 1006 transmits the three-dimensional space information to the control system, the control system controls the hydraulic cylinder 1105 to start after receiving the three-dimensional space information, the hydraulic cylinder 1105 controls the telescopic rod 1103 to move in the direction close to the seat ring until the surface of the support ball 1101 forms point contact with the lower surface of the seat ring and plays a supporting role.

[0050] It should be noted that in the process of supporting the seat ring, considering the different installation methods of the seat ring in actual life, the supporting method of the lower end of the seat ring is divided into complete support, partial support and mixed support. For example, the seat ring base of a household toilet is fixed to the surface of the toilet ceramic, the buffer pad fills the irregular gap between the seat ring and the ceramic, forming complete support. The automobile sports seat is only fixed to the frame by several high-strength bolts at the bottom of the seat ring, and the remaining parts are suspended to form partial support. The edge part of the massage chair seat ring is completely supported by hard material, while the middle part is suspended by air bags and springs, forming mixed support. Therefore, during the test, not all support components 11 are controlled by the control system to perform support operations. Instead, the control system controls different numbers of support components 11 located within the range below the seat ring to provide support functions according to the different types of seat rings. When mixed support or partial support is used, some support components 11 located below the seat ring provide support functions. When complete support is used, all support components 11 located below the seat ring provide support functions.

[0051] Further, the control system controls different support components 11 according to three-dimensional space information. The control signals received by the hydraulic cylinders 1105 of different support components 11 are different, resulting in different movement distances of different extension rods 1103. Different extension rods 1103 drive the support balls 1101 fixedly connected thereto to form point contact with the lower surface of the seat ring and provide support. 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] Further, from the process of point contact between the support ball 1101 and the lower surface of the seat ring to the process of providing support, the time of this process is extremely short, so the pressure sensor 1106 detects the instantaneous change of force, from 0 to peak and then to 0. This indicates that the support ball 1101 is in contact with the lower surface of the seat ring and provides support, producing a rigid impact. In 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] Further, if the lower surface of the seat ring is an irregular surface, it is difficult for the single point contact position formed by the support ball 1101 and the lower surface of the seat ring to provide sufficient support. Under the action of a rigid impact, the external force on the surface of the support ball 1101 cannot form an effective balance, so that the universal joint 1102 rotates, and the support ball 1101 rotates under the action of the universal joint 1102. In the process of continuous rotation of the universal joint 1102, the contact position between the support ball 1101 and the surface of the seat ring is in a state of constant replacement, until the lower surface of the seat ring and the surface of the support ball 1101 form multiple point contacts or a stable single point contact state that meets the bearing requirements. The stable single point contact or multiple point contact between the support ball 1101 and the seat ring forms a radial force, which offsets 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 limited to rotate under the action of the radial force. After the seat ring is stably placed, at this time, all the pressure sensors 1106 of the support assemblies 11 participating in the support work should detect the same size of force generated due to the gravity of the seat ring.

[0054] Further, if there is a support assembly 11 that is performing partial support or mixed support, and the irregularity of the lower surface of the seat ring is large, the support ball 1101 cannot always adjust to an effective spatial position under the action of the universal joint 1102. Therefore, the corresponding pressure sensor 1106 cannot detect the force generated due to the gravity of the seat ring, or the detected force is smaller than the force detected by the remaining pressure sensors 1106. This indicates that there is a support dead angle in the lower end range of the seat ring at this time. Therefore, the control system controls the remaining support assemblies 11 located in the lower end region of the seat ring to participate in the support work, and controls the support assemblies 11 located in the support dead angle to reset and stop working. By changing the support point position of the seat ring, the phenomenon of premature fracture caused by the change of the natural frequency of the region due to the partial support or mixed support of the seat ring without support structure in the lower end surface of the seat ring is effectively avoided.

[0055] It should be noted that if the support assembly 11 performs overall support, all the support assemblies 11 located below the seat ring provide support functions. Enough support balls 1101 form point contacts with the lower end surface of the seat ring. Even if there is a support dead angle in the lower end surface of the seat ring, a large number of point contacts can disperse the load applied in this region 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 assemblies 11 during the adjustment of the spatial position of the support ball 1101.

[0057] Step three: after the support assembly 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 screw rod two 13 to rotate, the screw rod two 13 drives the moving seat 12 to move along the axial direction of the screw rod two 13, the moving seat 12 drives the adjustable support arm 2 to move along the axial direction of the screw rod two 13, the adjustable support arm 2 drives the air cylinder 1 and the rotatable rubber pad 3 to move along the axial direction of the screw rod two 13, realizing the horizontal movement of the rotatable rubber pad 3 in the state of being perpendicular to the rack 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, the sliding base 9 drives the moving shaft 21 to move along the through hole 19, realizing the angular deflection of the adjustable support arm 2, and further driving the angular deflection of the air cylinder 1 and the rotatable rubber pad 3, and realizing the adjustment of different test requirements of different specifications of seat rings.

[0059] Further, through the cooperative control strategy of the control system on the first drive 7 and the second drive 8, the two are synchronized, through the accurate setting of the motion parameters and time sequence of the double-drive system, the compound motion of the adjustable support arm 2 in the horizontal translation and the angular change is realized, and diversified and accurate motion working condition simulation is provided for the seat ring test.

[0060] Further, through the cooperative control strategy of the control system on the first drive 7 and the second drive 8, the two are synchronized, through the accurate setting of the motion parameters and time sequence of the double-drive system, the compound motion of the adjustable support arm 2 in the horizontal translation and the angular change is realized, and diversified and accurate motion working condition simulation is provided for the seat ring test.

[0061] Step four: start the air cylinder 1, the air 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 keeps a certain distance.

[0062] It should be noted that the diameter of the air cylinder 1 is 50.8mm, and the stroke is 127mm, which determines the power output range and motion amplitude of the air cylinder 1.

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

[0064] Further: the power output range and motion amplitude of the air cylinder 1 required for this test are input in the control system.

[0065] Step five: start the air cylinder 1, the air cylinder 1 drives the rotatable rubber pad 3 to apply load to the upper surface of the seat ring, so as to test the performance of the seat ring under the action of the load, such as the physical properties of the seat ring, such as the rocking stability, the yield strength and the like.

[0066] Step six: after completing step five, the control system starts the third drive 1007 again, the third drive 1007 drives the screw rod one 1001 to rotate, the screw rod one 1001 drives the moving support 1005 to move along the axial direction of the screw rod one 1001, the moving support 1005 drives the structured light detector 1006 to move along the axial direction of the screw rod one 1001, in the moving process, the structured 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 the three-dimensional space information of the seat ring is obtained for the second time.

[0067] Further, the control system compares and analyzes the three-dimensional space information of the seat ring obtained for the second time with the three-dimensional space information of the seat ring obtained in step one, to determine whether the seat ring is structurally fractured in the operation process of step five.

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

[0069] Function one: after completing step one, the moving distance and deflection angle of the adjustable support arm 2 required for testing the rocking stability of the seat ring are input into the control system, the control system controls the support assembly 11 to complete step two, then the control system controls the first drive 7 and the second drive 8 to complete step three, the power output range and movement amplitude required for the rocking stability test of the cylinder 1 are input into the control system, the cylinder 1 completes step four, and the cylinder 1 drives the seat ring to be loaded alternately on both sides, the time for each load is 1s, and after an interval of 0.5s, the other side is loaded, and the cycle is repeated to test the rocking stability of the seat ring.

[0070] In the process of loading the cylinder 1, the load received by the seat ring is transmitted downward to the support ball 1101, the support assembly 11 is 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] In the elastic cycle stage of the seat ring, the pressure sensor 1106 shows that each load rises linearly and gradually stabilizes, and the force returns to 0 after unloading, in this process, the rocking stability of the seat ring is good, and the cylinder 1 gradually applies greater load to the seat ring.

[0072] When the pressure sensor 1106 detects that the force changes linearly in the process of loading without damage to the seat ring, when the seat ring is fractured due to excessive load, at the moment of fracture, the original load bearing path of the external load is destroyed, the stress at the fracture is rapidly released, and the value detected by the pressure sensor 1106 suddenly drops to 0, at this time, the control system ends step five, enters step six, confirms the fracture of the seat ring, and records the load application value of the cylinder 1 at the time of fracture, which is the maximum load that satisfies the rocking stability of the seat ring.

[0073] Function two: replace the damaged seat with a new seat, after completing step one, input the adjustable support arm 2 movement distance and deflection angle required to test the yield strength of the seat into the control system, at this time the deflection angle of the adjustable support arm 2 is 0, that is, the adjustable support arm 2 maintains a vertical position relationship with the seat in this test, the control system controls the support assembly 11 to complete step two, then the control system controls the first drive 7 to complete step three, 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, the cylinder 1 completes step four, drives the cylinder 1 to apply load to both sides of the seat, and keeps the adjustable support arm 2 stationary at all times, that is, the load applied at this time is static load.

[0074] During the load application process of the cylinder 1, the load transmission principle in the support assembly 11 is the same as that in function one, and will not be described in detail here.

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

[0076] Before step six starts, keep the seat stationary for a period of time, if the surface state of the seat changes during the stationary time, that is, the surface state of the seat gradually returns to before the cylinder 1 applies load, it indicates that the load applied at this time causes elastic deformation of the seat, if the surface state does not change, it indicates that the load applied at this time causes plastic deformation of the seat, at this time the change in the surface state of the seat may not be observable with the naked eye, the change that cannot be observed with the naked eye needs to be further detected in step six, the change that can be observed with the naked eye, for example, the seat surface breaks obviously, that is, the seat surface directly skips the plastic deformation stage and breaks, or the plastic deformation stage occurs extremely short, making it difficult to detect, then step six can be omitted, and the maximum value satisfying the yield strength can be obtained by querying the load value applied by the cylinder 1 at this time recorded by the control system.

[0077] If the seat surface changes that cannot be observed with the naked eye, enter step six, if the three-dimensional space information obtained in step six is the same as that obtained in step one, detect the position of the telescopic rod 1103 at this time through the displacement sensor 15, if it is the same as the position after step two is completed, it indicates that the load of this size does not reach the yield strength.

[0078] Continue to increase the load applied by the cylinder 1, repeat the operation of the above function two, each time the operation of function two is repeated, gradually increase the load applied by the cylinder 1, after each load application stops, the seat ring is static for a period of time, on the one hand, waiting for the surface state change of the seat ring to end, on the other hand, waiting for the residual vibration of the load to completely decay, since the working principle of the structured light detector 1006 is to project a specific pattern of structured light onto the surface of the measured object, collect the deformed pattern and calculate the three-dimensional space information, therefore, the stable state of the measured object has a great influence on the calculation of the three-dimensional space information, so it is necessary to wait for the residual vibration of the load to completely decay to avoid errors caused by vibration in the next detection, until the three-dimensional space information obtained in step six is different from the three-dimensional space information obtained in step one, that is, the upper surface of the seat ring appears concave, the position of the telescopic rod 1103 is detected again through the displacement sensor 15 at this time, if the position of the telescopic rod 1103 remains unchanged after the cylinder 1 stops applying load, it indicates that the load of this size causes plastic deformation of the seat ring, that is, the upper surface of the seat ring appears concave, which indicates that the load of this size is the maximum load that meets the yield strength of the seat ring.

[0079] Further, by analyzing the degree of concave of the upper surface of the seat ring, various physical information of the seat ring material can be obtained, such as the hardness value of the material, that is, the greater the depth of the concave when a constant load is applied to the surface of the material, the lower the hardness of the material, at the same time, if the concave edge does not appear cracks and the material remains intact when the depth increases, it indicates that the ductility is good, on the contrary, shallow concave and cracking indicate that the material is brittle.

[0080] Further, by analyzing the absolute deformation of the seat ring of different thicknesses when bearing load, that is, the difference between the size before and after deformation of the seat ring, the thickness interval that can meet the stiffness requirement and minimize the weight can be determined, saving production cost, during the test process of different thicknesses of the measured structure under the same load condition, relevant absolute deformation data can be collected to construct a thickness quality detection standard including but not limited to the seat ring structure.

[0081] Further, when the seat ring appears plastic deformation, continue to increase the load applied by the cylinder 1 until the plastic deformation region breaks, the method of detecting the fracture is the same as the method of detecting the fracture in function one, which will not be described in detail again, after the fracture occurs, step six is performed again to obtain new three-dimensional space information, by comparing with the three-dimensional space information obtained in step one, the necking degree of the seat ring fracture and the symmetry of the deformation can be detected, the difference between the necking diameter and the original diameter of the seat ring is the maximum plastic deformation, at the same time, if the necking degree of the two ends of the fracture is asymmetric, the possible reason is loading bias or reflects the anisotropy of the material, the loading bias indicates that the load action line of the seat ring does not coincide with the material axis, resulting in non-uniform stress, the anisotropy of the material means that the mechanical properties of the material in different directions are different, which may cause the weak direction to fail preferentially when bearing load.

[0082] It should be noted that in the operation process of the above-mentioned function one and function two, the spring 1104 will absorb part of the load in the process of load transmission for protecting the overall structure of the support assembly 11 from being damaged, resulting in that the value collected by the pressure sensor 1106 is not correct, but the specific value of the load collected by the pressure sensor 1106 has no influence on the implementation of the above-mentioned two functions, as long as the change rule of the load collected by the pressure sensor 1106 meets the description in the above-mentioned functions, the next stage of operation can be entered.

[0083] It should be noted that in the operation process of the above-mentioned function two, the universal joint 1102 drives the support ball 1101 to rotate to adjust the spatial position, resulting in that in the operation process of function two, the continuity of external load transmission is ensured through the rotation of the universal joint 1102, the displacement error of the telescopic rod 1103 caused by the loss in the process of load transmission is reduced, the displacement data collected by the displacement sensor 15 is more accurate, and the error in the process of seat ring deformation is reduced.

[0084] Function three: after the detection of the above-mentioned function one is completed, the measured seat ring is broken, therefore, before the detection of function two is carried out, the same specification of the measured seat ring needs to be replaced for detection, the maximum load finally detected in function one is recorded as the first standard load, the moving distance and the deflection angle of the support assembly 11 and the adjustable support arm 2 are kept at the working position in function one, the air cylinder 1 is started, the rotatable rubber pad 3 is directly driven by the air cylinder 1 to 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 that of the load in function one, which will not be described in detail here, the load borne by 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 , it is indicated that the working state of the rotatable rubber pad 3 is good, if the difference between the first test load and the first standard load is greater than or equal to , the specific performance is that the first test load is less than the first standard load, since the wear will significantly reduce the energy transmission efficiency between the contact interfaces of objects, it is indicated that the contact surface between the rotatable rubber pad 3 and the seat ring is worn in the alternating load process of function one.

[0085] Further, when judging that the rotatable rubber pad 3 appears wear, the control system controls the support assembly 11 to reset, and the required moving distance and deflection angle of the adjustable support arm 2 in the function two of the control system, at this time the deflection angle of the adjustable support arm 2 is 0, that is, the adjustable support arm 2 is in a vertical position relationship with the support assembly 11 at this time, the rotatable rubber pad 3 is controlled to be in contact with the support ball 1101, and the required power output range and movement amplitude of the cylinder 1 for the yield strength test are input in the control system, so that the rotatable rubber pad 3 directly applies a load to the support ball 1101, and the load is recorded as a second standard load. The transmission principle of the second standard load in the support assembly 11 is the same as that of the load in the function one, and will not be described in detail here. The load borne by the pressure sensor 1106 at this time is recorded as a second test load. Due to the wear of the surface of the rotatable rubber pad 3 and the energy loss in the load transmission process, the size of the second test load should be much smaller than the load applied by the cylinder 1.

[0086] In order to eliminate the error caused by the 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 load to the support ball 1101, which is recorded as a third standard load. The load borne by the pressure sensor 1106 under this condition is recorded as a third test load. The difference between the third test load and the second standard load is compared, and when the difference between the third test load and the second standard load is less than , it is indicated that the energy loss caused by the wear of the surface of the rotatable rubber pad 3 has been compensated, and the third test load is taken as the initial load of the function two.

[0087] Further, although the seat ring with a higher irregularity degree has been replaced through step one, there are still slight 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 rotatable rubber pad 3 that have been worn 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 cause local stress concentration, which is easy to accelerate the initiation of cracks. Especially at the position of the pit bottom of the seat ring surface, since the relative thickness of the pit bottom is small and the stress concentration is large, the seat ring surface at the pit position is prone to premature fracture, causing test errors. At the same time, the pit edges produce fatigue spalling due to repeated high stress, forming new wear particles, aggravating the occurrence of cracks and expanding the range and depth of the pits, and producing a vicious cycle.

[0088] Further, the control system controls the cylinder 1 to divide the required single load for the test into multiple levels of cyclic progressive loading, that is, a cycle process of loading-unloading-loading, and each level of load is increased by , each stage interval 5 s, until the last stage load to test required, in each cycle, using the plastic deformation of the self-compensation effect when the load, the pit was partially filled, filling up to 20-30% of the wear depth.

[0089] Further, after each unloading, start detection component 10, using structured light detector 1006 scan the surface of the seat ring, observe the seat ring surface pit whether to expand, when detected within 20 cycles process, the seat ring surface pit diameter expansion , or when detected within 50 cycles process seat ring surface pit diameter expansion , that is, at this time into the vicious cycle of acceleration period, and because the pit edge due to repeated high stress fatigue spalling, constantly form new wear particles, wear particles on the pit inside produce additional wear, therefore the pit edge expansion is bound to accompany the pit depth deepening, when into the vicious cycle of acceleration period, determine the seat ring surface environment and local relative thickness at this time has not met the test requirements, the need to replace.

[0090] It should be noted that in this paper, such as the first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent in such process, method, article or equipment.

[0091] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for the limitation of the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for the skilled in the art, it still can be modified, or the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, shall be included in the protection scope of the present application.

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), a hydraulic cylinder (1105) is fixedly installed at 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 at 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), and a frame (4) is fixedly installed at the lower end of the support component (11).

2. The multifunctional swing fatigue testing machine according to claim 1, characterized in that: The upper end of the frame (4) is provided with a rectangular groove, and several of the support components (11) are fixedly installed inside the rectangular groove. The lower end of the pressure sensor (1106) is fixedly connected to the bottom of the rectangular groove. A steel platform (5) is fixedly installed on the upper end of the frame (4), and a detection component (10) 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 detection component (10) includes a second sliding track (1003), which is symmetrically arranged at both ends of the support component (11). Each set of the second sliding track (1003) is fixedly installed on the upper end of the frame (4). Each set of the second sliding track (1003) is fixedly installed with a support column (1002) on the upper end. Each set of the support column (1002) is fixedly installed with a first sliding track (1004) on 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).

4. The multifunctional swing fatigue testing machine according to claim 3, characterized in that: Each groove (16) is provided with a lead screw (1001). One end of each lead screw (1001) is connected to the bearing of the corresponding sliding rail (1004) and sliding rail (1003). The other end of each lead screw (1001) is fixedly connected to a third drive (1007). Each third drive (1007) is fixedly installed on the outer end of the sliding rail (1004) and sliding rail (1003). Each lead screw (1001) is fitted with a movable bracket (1005). Each movable bracket (1005) is provided with an installation platform in the middle position. Each installation platform is fixedly installed with a structure light detector (1006) on one side opposite to the other side.

5. A multifunctional swing fatigue testing machine according to claim 4, characterized in that: Each set of lead screws (1001) is provided with a gantry frame (6) on the outside, and the gantry frame (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 moving slots (17) are provided at the bottom of the crossbeam of the gantry frame (6). Each set of moving slots (17) is provided 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 one end. The other end of each set of second screw rods (13) is fixedly connected to a first drive (7). The first drive (7) is fixedly installed on the outer end of the two side columns of the gantry frame (6). Sliding slots (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 slot (18). A second drive (8) is fixedly installed on the outer end 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: 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).

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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