A spring fatigue testing machine

Abstract

The application discloses a spring fatigue testing machine and relates to the field of spring fatigue detection.The spring fatigue testing machine comprises a rack, a table plate installed on the rack, a center hole formed in the center of the table plate, a plurality of sensor assemblies uniformly distributed in the circumferential direction on the table plate, a main fixed plate, a push rod assembly penetrating through each corresponding position of the sensor assemblies, a to-be-tested spring installed between the sensor assemblies and the corresponding push rod assemblies, a main shaft driven by a motor, an eccentric bearing assembly, a roller follower installed at one end of the push rod assembly and abutting against the outer wall of the bearing after the eccentric bearing assembly is locked with the main shaft and then is placed into an inner mounting hole. In the application, the inner and outer taper surfaces of the inner taper sleeve and the outer taper sleeve are matched to be self-locked to form an eccentric cam structure, and it is more convenient to adjust the eccentric distance; online detection is realized by using the sensor, automatic judgment can be realized when the spring force value decays or breaks, and the spring fatigue testing machine is particularly suitable for springs with large stiffness and small deformation and overcomes the defects of the previous microswitch detection alarm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spring fatigue detection, and in particular to a spring fatigue testing machine. BACKGROUND

[0002] The spiral spring for automobile clutch is one of the important elements to ensure the normal operation of the clutch. The working durability and reliability of the spring are one of the important indicators to ensure the normal operation of the automobile clutch assembly. In the prior art, a spring fatigue testing machine is used to test the durability of the spring. The deformation amount of the spring is monitored in real time through a micro switch. When the spring fails due to fatigue, the deformation amount exceeds the set threshold, and the micro switch sends an alarm signal to realize fatigue testing. However, for springs with large stiffness and small deformation, it is difficult to accurately measure the micro switch, resulting in unsatisfactory test results.

[0003] Chinese patent document (CN112729801B) discloses a spring fatigue testing machine, comprising: a base; a rotating mechanism, the rotating mechanism comprising: a rotating shaft; an eccentric assembly, the eccentric assembly being provided with: a rotating shaft slot, the eccentric assembly being sleeved on the rotating shaft through the rotating shaft slot, so that the eccentric state of the eccentric assembly relative to the rotating shaft is adjustable; a movable slot, the eccentric assembly being fixedly connected to the rotating shaft through the movable slot; and a bushing part; a rotating wheel, the rotating wheel being sleeved on the bushing part of the eccentric assembly; and a counterweight assembly, the counterweight assembly being sleeved on the rotating shaft through a third rotating shaft slot, so that the eccentric state of the counterweight assembly relative to the rotating shaft is adjustable; wherein the rotating mechanism acts on the impact mechanism through the rotating wheel, so that the impact mechanism impacts the spring to be detected; achieving the technical effect that the test stroke of the spring fatigue testing machine is adjustable.

[0004] In the technical solution, the spring to be detected located between the impact shaft and the top rod assembly is impacted by the impact shaft relative to the top rod assembly, so that the spring to be detected can withstand the impact under the simulated working environment. The above test operation is repeated to observe the number of impacts that the spring to be detected can withstand, and the fatigue strength is obtained. As can be seen, the number of impacts of the spring cannot be automatically recorded, and it is difficult to realize automation, and manual intervention is required, which may lead to inaccurate test results due to human factors. In addition, in the technical solution, only tests with adjustable test strokes can be performed, and tests according to the size of the test force cannot be performed, which needs to be improved. SUMMARY

[0005] The present application aims to overcome the deficiencies of the prior art and provide a spring fatigue testing machine that can perform compression durability tests on spiral springs under adjustable compression strokes, thereby providing reliability indicators.

[0006] The purpose of the present application is achieved by the following technical solution: the spring fatigue testing machine comprises:

[0007] a rack, a table plate is installed on the rack, and a center hole is formed in the center of the table plate;

[0008] a main fixing plate is fixed to the table plate through a pin hole and a screw, an inner installation hole is formed in the center of the main fixing plate and communicates with the center hole, a plurality of sensor assemblies are uniformly distributed in the circumferential direction of the table plate, a push rod assembly is arranged at a position corresponding to each sensor assembly on the main fixing plate, and a spring to be measured is installed between the sensor assembly and the corresponding push rod assembly;

[0009] a main shaft, an upper end of the main shaft penetrates through the center hole and is supported on the table plate, and a lower end of the main shaft is driven by a motor fixed to the rack; and

[0010] an eccentric bearing assembly, which comprises an inner taper sleeve sleeved on the upper end of the main shaft, an outer taper sleeve matched with the taper surface of the inner taper sleeve, and a bearing sleeved on the outer wall of the outer taper sleeve, the eccentric bearing assembly is locked with the main shaft and then placed in the inner installation hole, the inner taper sleeve and the outer taper sleeve are designed to be eccentric, and different required spring compression test strokes can be obtained by freely combining the two, a roller follower is installed at an end of the push rod assembly away from the sensor assembly, and the roller follower abuts against the outer wall of the bearing;

[0011] When the main shaft rotates, the bearing rotates eccentrically relative to the main shaft, drives the push rod assembly to make reciprocating motion relative to the sensor assembly, and makes each spring to be measured in a reciprocating motion state of being compressed or loosened.

[0012] As a further technical scheme, the push rod assembly comprises a guide shaft fixing plate and a push rod, a push rod installation hole is formed at a position corresponding to each push rod on the main fixing plate (the push rod installation holes are uniformly distributed in the circumferential direction of the main fixing plate, and a self-lubricating tin bronze-based composite bearing is arranged in the push rod installation hole), the push rod is arranged in the guide shaft fixing plate and the main fixing plate in a relative sliding manner, the roller follower is installed at an end of the push rod facing the bearing, a spring positioning block is fixed to an end of the push rod away from the bearing through a spring positioning fixing plate, and is used for positioning and installing one end of the spring to be measured, the guide shaft fixing plate is fixed to the main fixing plate in the circumferential direction through a pin, the guide shaft fixing plate is used for fixing a guide column and a limiting flat key, the limiting flat key is matched with a key groove on the push rod to realize control of the movement direction of the push rod, and the sensor assembly is installed on the guide column.

[0013] As a further technical scheme, two extension parts are arranged in parallel and at intervals at the end of the push rod facing the bearing, a clamping groove is formed between the two extension parts, a pin hole is formed in each extension part, the roller follower is installed in the clamping groove through a fixing pin, a counterbore is formed at the end of the push rod away from the bearing, the spring positioning fixing plate and the spring positioning block are fixed and connected through a bolt, a guide groove is formed on the outer wall of the push rod, and a guide pin is arranged in the guide groove, so that the push rod slides relative to the guide shaft fixing plate and the main fixing plate and is guided.

[0014] As a further technical solution, the sensor assembly comprises a sensor fixing plate, a connecting rod and an adjusting screw fixing plate, a sensor is installed in the sensor fixing plate, one end of the connecting rod is connected with the sensor, the other end of the connecting rod is fixed with a spring positioning block through a spring positioning fixing plate after penetrating through the sensor fixing plate, for positioning and installing the other end of the spring to be measured; an adjusting screw is provided on the adjusting screw fixing plate, the adjusting screw is on the sensor fixing plate, for adjusting the distance between the sensor fixing plate and the push rod, to adapt to different specifications of the spring to be measured, and a locking nut is provided on the adjusting screw, for fixing the test position.

[0015] As a further technical solution, a sensor mounting groove is provided in the center of the sensor fixing plate, for placing the sensor and fixing the sensor through a sensor fixing hole provided on the sensor fixing plate, a connecting rod mounting hole is provided in the side of the sensor mounting groove away from the sensor fixing hole, for penetrating the connecting rod; guide holes are provided on both sides of the sensor fixing plate, corresponding guide holes are also provided on the guide shaft fixing plate and the adjusting screw fixing plate, and a positioning pin penetrates the guide shaft fixing plate, the sensor fixing plate and the adjusting screw fixing plate in sequence, so that when the adjusting screw adjusts the sensor fixing plate, the sensor fixing plate slides along the positioning pin, and the guide is realized.

[0016] As a further technical solution, a motor is fixedly installed on the rack through a motor fixing plate, and a motor shaft end is connected through a shaft coupling to drive the main shaft; an oil receiving cover is installed at the bottom of the rack.

[0017] As a further technical solution, a main shaft sleeve is sleeved on the main shaft through a spacer sleeve, a flange is provided on the upper end of the main shaft sleeve, for embedding into the center hole of the table plate, the top end of the main shaft sleeve is fixed with an upper end cover sleeved on the main shaft, and the lower end of the main shaft sleeve is fixed with a lower end cover sleeved on the main shaft.

[0018] As a further technical solution, a hole is provided in the top end of the main shaft, for installing a main shaft bolt, facilitating manual rotation of the main shaft, and an external thread is also provided on the main shaft, for installing a round nut, the eccentric bearing assembly is sleeved into the main shaft, and then compressed by a locking washer B and a locking washer A in sequence, the locking washer B and the locking washer A are matched through a conical surface, the round nut is compressed on the locking washer A, the locking washer B is compressed on the upper end face of the inner and outer conical sleeves, and the lower end face of the inner conical sleeve is compressed on the step of the main shaft through a washer.

[0019] As a further technical solution, the outer and inner conical sleeves are designed as conical sleeves with the same eccentricity as the rotation center, the upper end face of the outer conical sleeve is provided with a scale in the circumferential direction, and the inner conical sleeve is provided with a scale line at a position corresponding to the scale, when the inner and outer conical sleeves are relatively rotated, the eccentricity is adjusted by adjusting the position of the scale line relative to the scale. The installation space can be saved, and the balance weight device can be reduced.

[0020] As a further technical scheme, a groove is formed at the top of the main fixed plate for installing a protective cover, and the protective cover covers the eccentric bearing assembly and the main shaft.

[0021] The present application has the following advantages:

[0022] 1. The inner and outer conical surfaces of the inner and outer conical sleeves are matched and self-locked to form an eccentric cam structure, and the eccentric distance is more convenient to adjust.

[0023] 2. A sensor assembly is arranged at the fixed end of the measured spring, i.e. a force sensor is added, the sensor can transmit the force value data of the measured spring to the outside in real time, and online detection can be performed during the test, and when the force value of the spring decays or breaks, it can be judged through the setting of the software threshold, especially for springs with large stiffness and small deformation, overcoming the defects of the previous microswitch detection alarm.

[0024] 3. When the push rod slides relative to the guide shaft fixed plate and the main fixed plate, it is guided by the guide pin, and when the adjusting screw is used to adjust the sensor fixed plate, the sensor fixed plate slides along the positioning pin to form a double-guiding structure, which has high guiding accuracy and is convenient to adjust, especially when fine-tuning, a circular nut is installed at the top of the main shaft, and a mechanical eccentric cam structure is used, so that the test stroke is accurate, and the testing machine can test according to the test stroke or the test force. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic view of the front view structure of the present application.

[0026] Figure 2 It is Figure 1 A local enlarged view of area A in the middle.

[0027] Figure 3 It is a schematic view of the top view structure of the present application.

[0028] Figure 4 It is Figure 3 A local enlarged view of area B.

[0029] Figure 5 It is a schematic view of the structure after the main fixed plate and the table plate are fixed.

[0030] Figure 6 It is a schematic view of the structure after the main shaft sleeve and the table plate are fixed.

[0031] Figure 7 It is a schematic view of the structure of the sensor fixed plate.

[0032] Figure 8 It is a schematic view of the front view structure of the sensor fixed plate.

[0033] Figure 9Structure diagram of push rod in the application.

[0034] Figure 10 Structure diagram of main shaft in the application.

[0035] Figure 11 Structure diagram of inner cone sleeve in the application.

[0036] Figure 12 Structure diagram of outer cone sleeve in the application.

[0037] BRIEF DESCRIPTION OF DRAWINGS: rack 1, main fixed plate 2, push rod mounting hole 2-1, inner mounting hole 2-2, groove 2-3, table plate 3, center hole 3-1, adjusting screw 4, adjusting screw fixed plate 5, sensor fixed plate 6, sensor mounting slot 6-1, connecting rod mounting hole 6-2, sensor fixing hole 6-3, guide hole 6-4, sensor 6-5, positioning pin 7, connecting rod 8, spring positioning block 9, spring positioning fixed plate 10, guide shaft fixed plate 11, push rod 12, extension 12-1, clamping groove 12-2, pin hole 12-3, counterbore 12-4, guide groove 12-5, protective cover 13, main shaft 14, main shaft bolt 14-1, external thread 14-2, locking washer A 15, locking washer B 16, inner cone sleeve 17, scale line 17-1, outer cone sleeve 18, scale 18-1, guide pin 19, roller follower 20, fixed pin 21, upper end cover 22, spacer sleeve 23, main shaft sleeve 24, flange 24-1, lower end cover 25, motor fixed plate 26, coupling 27, oil cover 28, motor 29, round nut 30, spring to be measured 31, bearing 32. DETAILED DESCRIPTION

[0038] The application will be described in detail below with reference to the accompanying drawings:

[0039] Embodiment: as shown in the accompanying drawings Figures 1-12As shown, this spring fatigue testing machine includes a frame 1, a main fixing plate 2, a push rod mounting hole 2-1, an inner mounting hole 2-2, a groove 2-3, a platform 3, a center hole 3-1, an adjusting screw 4, an adjusting screw fixing plate 5, a sensor fixing plate 6, a sensor mounting slot 6-1, a connecting rod mounting hole 6-2, a sensor fixing hole 6-3, a guide hole 6-4, a sensor 6-5, a positioning pin 7, a connecting rod 8, a spring positioning block 9, a spring positioning fixing plate 10, a guide shaft fixing plate 11, a push rod 12, an extension 12-1, a slot 12-2, and a pin hole 1. 2-3, Countersunk Hole 12-4, Guide Groove 12-5, Protective Cover 13, Main Spindle 14, Main Spindle Bolt 14-1, External Thread 14-2, Locking Washer A 15, Locking Washer B 16, Inner Taper Sleeve 17, Gradient 17-1, Outer Taper Sleeve 18, Scale 18-1, Guide Pin 19, Roller Follower 20, Fixing Pin 21, Upper End Cover 22, Spacer 23, Main Spindle Outer Sleeve 24, Flange 24-1, Lower End Cover 25, Motor Mounting Plate 26, Coupling 27, Oil Drain Cover 28, Motor 29, Round Nut 30, Spring to be Tested 31, and Bearing 32.

[0040] Reference Appendix Figure 1 A platform 3 is fixedly installed at the top of the frame 1. A motor 29 is fixedly installed in the middle of the frame 1 via a motor fixing plate 26. The shaft end of the motor 29 is connected to the main shaft 14 through a coupling 27 to drive the main shaft 14 to rotate. An oil collection cover 28 is installed at the bottom of the frame 1.

[0041] like Figure 2 , 5 As shown, a center hole 3-1 is opened in the center of the platform 3. The main fixing plate 2 is fixed to the middle of the platform 3 by a pin hole and screw thread connection. An inner mounting hole 2-2 is opened in the center of the main fixing plate 2, so that the center hole 3-1 is exposed from the inner mounting hole 2-2, and the two are connected to each other. Figure 3 , 4 As shown, six sets (or other numbers) of sensor assemblies are evenly distributed along the circumference on the platform 3. A push rod assembly is installed on the main fixing plate 2 at the corresponding position of each sensor assembly (i.e., the sensor assembly and the push rod assembly correspond one-to-one). The spring to be tested 31 is installed between the sensor assembly and the corresponding push rod assembly.

[0042] Reference Appendix Figure 2 , 10 The upper end of the spindle 14 passes through the central hole 3-1 and is supported on the platform 3. The lower end of the spindle 14 is driven by a motor 29 fixed on the frame 1. A spindle sleeve 24 is fitted onto the outer wall of the spindle 14 through a spacer 23. Figure 6 As shown, the upper end of the spindle sleeve 24 is provided with a flange 24-1, which can be inserted into the center hole 3-1 of the table plate 3. The top end of the spindle sleeve 24 is fixed to the upper end cover 22 sleeved on the spindle 14, and the lower end of the spindle sleeve 24 is fixed to the lower end cover 25 sleeved on the spindle 14.

[0043] As Figure 1 , 2 shown, the inner cone sleeve 17 set on the upper end of the main shaft 14, the outer cone sleeve 18 matched with the conical surface of the inner cone sleeve 17, and the bearing 32 set on the outer periphery of the outer cone sleeve 18 together constitute an eccentric bearing assembly, which is placed in the inner mounting hole 2-2 after being locked with the main shaft 14, and the inner cone sleeve 17 and the outer cone sleeve 18 are both designed to be eccentric, and the two can be freely combined to obtain different required spring compression test strokes by matching with each other. The roller follower 20 is installed on the end of the push rod assembly away from the sensor assembly, and the roller follower 20 is in abutment with the outer wall of the bearing 32. When the main shaft 14 rotates, the bearing 32 rotates eccentrically relative to the main shaft 14, driving the push rod assembly to make reciprocating motion relative to the sensor assembly, so that each spring 31 to be tested is in a reciprocating motion state of being compressed or loosened.

[0044] Further, the push rod assembly includes a guide shaft fixing plate 11 and a push rod 12, as Figure 5 shown, the main fixing plate 2 is provided with push rod mounting holes 2-1 (a total of six push rod mounting holes 2-1 are provided, the push rod mounting holes 2-1 are uniformly distributed along the circumference of the main fixing plate 2, and self-lubricating tin bronze-based composite bearings are arranged in the push rod mounting holes 2-1) at positions corresponding to each push rod 12. The push rod 12 is slidably arranged on the guide shaft fixing plate 11 and the main fixing plate 2. The roller follower 20 is installed on the end of the push rod 12 towards the bearing 32. The end of the push rod 12 away from the bearing 32 is fixed with a spring positioning block 9 through a spring positioning fixing plate 10, which is used to position and install one end (as a movable end) of the spring 31 to be tested. The guide shaft fixing plate 11 is fixed on the main fixing plate 2 in the circumferential direction through a pin. The guide shaft fixing plate 11 is used to fix guide columns and limit keys. The limit keys are matched with key grooves on the push rod 12 to control the movement direction of the push rod 12. The sensor assembly is installed on the guide columns.

[0045] As Figure 9 shown, two extension parts 12-1 are arranged in parallel and at intervals at the left end (the end towards the bearing 32) of the push rod 12, and a clamping groove 12-2 is formed between the two extension parts 12-1. A pin hole 12-3 is formed through each extension part 12-1, so that the roller follower 20 is installed in the clamping groove 12-2 through a fixing pin 21. A counterbore 12-4 is formed at the right end (the end away from the bearing 32) of the push rod 12, and the spring positioning fixing plate 10 and the spring positioning block 9 are fixed and connected through bolts. A guide groove 12-5 is formed on the outer wall of the push rod 12, which is used to accommodate a guide pin 19. When the push rod 12 slides relative to the guide shaft fixing plate 11 and the main fixing plate 2, the guide pin 19 is used for guiding.

[0046] Reference is made to the accompanying Figure 4 , 7The sensor assembly includes a sensor fixing plate 6, a connecting rod 8 and an adjusting screw fixing plate 5. A sensor 6-5 is installed in the sensor fixing plate 6. One end of the connecting rod 8 is connected with the sensor 6-5. The other end of the connecting rod 8 is fixed with a spring positioning block 9 through a spring positioning fixing plate 10 after penetrating through the sensor fixing plate 6, and is used for positioning and installing the other end (as a fixed end) of the spring 31 to be measured. An adjusting screw 4 is arranged on the adjusting screw fixing plate 5 and is used for adjusting the distance between the sensor fixing plate 6 and the push rod 12 to adapt to different specifications of the spring 31 to be measured. Further, a sensor installation groove 6-1 is arranged at the center of the sensor fixing plate 6 and is used for placing the sensor 6-5. The sensor 6-5 is fixedly connected with a sensor fixing hole 6-3 arranged on the sensor fixing plate 6 in a threaded mode. A connecting rod installation hole 6-2 is arranged on the side of the sensor installation groove 6-1 away from the sensor fixing hole 6-3 and is used for penetrating the connecting rod 8. Guide holes 6-4 are arranged on both sides of the sensor fixing plate 6. Corresponding guide holes 6-4 are also arranged on the guide shaft fixing plate 11 and the adjusting screw fixing plate 5. A positioning pin 7 penetrates the guide shaft fixing plate 11, the sensor fixing plate 6 and the adjusting screw fixing plate 5 in sequence. When the sensor fixing plate 6 is adjusted by the adjusting screw 4, the sensor fixing plate 6 slides along the positioning pin 7 to realize the guidance.

[0047] As shown in Figure 2 , 10 , a hole is arranged at the top end of the main shaft 14 and is used for installing a main shaft bolt 14-1 to facilitate manual rotation of the main shaft 14. An external thread 14-2 is arranged at the upper end of the main shaft 14 and is used for installing a round nut 30. After the eccentric bearing assembly is sleeved on the main shaft 14, the round nut 30 is pressed tightly on the locking washer A 15 after being matched with the external thread 14-2 and being pressed tightly by the locking washer B 16 and the locking washer A 15 in a conical surface matching mode. At the same time, the locking washer B 16 is pressed tightly on the upper end surface of the inner conical sleeve 17 and the outer conical sleeve 18. The lower end surface of the inner conical sleeve 17 is pressed tightly on the step of the main shaft 14 through a gasket.

[0048] As shown in Figure 11 , 12 , preferably, the outer conical sleeve 18 and the inner conical sleeve 17 are designed as conical sleeves with the same eccentricity from the rotation center. A scale 18-1 is arranged on the upper end surface of the outer conical sleeve 18 in the circumferential direction. A scale line 17-1 is arranged on the inner conical sleeve 17 at a position corresponding to the scale 18-1. When the inner conical sleeve 17 and the outer conical sleeve 18 are relatively rotated, the eccentricity is adjusted by adjusting the position of the scale line 17-1 relative to the scale 18-1. This is more flexible and convenient, can save installation space and reduce the balancing weight device.

[0049] Referring to the accompanying Figure 2 , 5A groove 2-3 is formed on the top of the main fixing plate 2 for mounting a protective cover 13, which covers the eccentric bearing assembly and the main shaft 14 to prevent impurities from entering and affecting the test.

[0050] The main technical parameters of the spring fatigue testing machine provided in the embodiment are as follows:

[0051] 1. Spring test force range: (500-10000) N;

[0052] 2. Maximum compression stroke: 30 mm;

[0053] 3. Test station: 6 (one station is equipped with one test spring);

[0054] 4. Maximum spring outer diameter: Φ70 mm;

[0055] 5. Stroke adjustment mode: manual adjustment of eccentric wheel stroke, eccentric wheel stroke according to eccentric wheel scale;

[0056] 6. Test frequency: when the test stroke is 15 mm, the test frequency reaches 25 Hz; when the test stroke is 20 mm, the test frequency reaches 20 Hz; and when the test stroke is 30 mm, the test frequency reaches 16 Hz.

[0057] 7. Maximum settable test number: 99999999.

[0058] 8. Minimum test frequency: 2 Hz.

[0059] Working process of the present application:

[0060] The main shaft 14 is rotated by the motor 29, and the eccentric wheel (eccentric bearing assembly) drives the 6 push rods 12 to drive the compression of the spring to be tested 31 for testing. The eccentric wheel is composed of an inner taper sleeve 17, an outer taper sleeve 18, a locking washer A 15, a locking washer B 16, and a round nut 30. The inner taper sleeve 17 is fixed on the main shaft 14, the outer taper sleeve 18 is combined on the taper surface of the inner taper sleeve 17 through the taper surface, and the inner taper sleeve 17 and the outer taper sleeve 18 are designed to be eccentric. The required compression stroke for testing is obtained by adjusting the different eccentric distances. The eccentric amount can be identified by the scale 18-1 marked on the outer taper sleeve 18, and finally locked by the round nut 30.

[0061] Spring clamping adjustment mode:

[0062] The eccentric amount of the eccentric wheel is adjusted to the specified test requirement by manual adjustment.

[0063] Check the spring test seat size is consistent with the test workpiece. Will be measured spring fixed in the test seat (ie, push rod assembly and sensor assembly), at this time with wrench turning spindle bolt 14-1, drive spindle 14 rotation, rotation of the eccentric wheel to the maximum eccentric position, the spring force value comparison (need to open the measurement software), such as not in the range can be adjusted at the same time load screw position, to be measured spring 31 in compression to the specified travel when the pressure tightness is the test position. Then the slider with M8 screw lock. Can also be measured by measuring the distance between the two ends of the spring 31 way to adjust. In this way, in turn, six workstations measured spring 31. Product installation and debugging, tooling replacement is simple.

[0064] Spring installation is complete, the data line of each sensor 6-5 is connected to the control end, the parameter setting of the measurement and control software is opened, whether the parameters meet the requirements of the specification is checked. If consistent, the "start" button of the control panel can be directly pressed, and the equipment automatically performs the test. During the test process, the equipment will perform online real-time monitoring according to the parameter setting requirements.

[0065] The monitoring software function is that the spring compression force is collected in real time during the test (one peak value is taken in one cycle), the software can set the maximum change value, when the monitored value exceeds the change value, the system sends a stop command to the control end. The measured data can be stored and exported, and the data storage interval can be set (for example, store a data every 1000 times).

[0066] It can be understood that equivalent replacement or changes to the technical solutions and inventive concepts of the present application should belong to the protection scope of the claims attached to the present application.

Claims

1. A spring fatigue testing machine, characterized in that, include: A frame (1) is provided, and a table (3) is installed on the frame (1). A center hole (3-1) is opened in the center of the table (3). The main fixing plate (2) is fixed in the middle of the platform (3). The main fixing plate (2) has an inner mounting hole (2-2) in the center and is connected to the center hole (3-1). Several sensor components are evenly distributed on the platform (3) along the circumferential direction. A push rod assembly is installed on the main fixing plate (2) at the position corresponding to each sensor component. The spring to be tested (31) is installed between the sensor component and the corresponding push rod assembly. The spindle (14) has its upper end passing through the center hole (3-1) and supported on the table plate (3). The lower end of the spindle (14) is connected to and driven by a motor (29) fixed on the frame (1); and The eccentric bearing assembly includes an inner tapered sleeve (17) fitted on the upper end of the main shaft (14), an outer tapered sleeve (18) that mates with the tapered surface of the inner tapered sleeve (17), and a bearing (32) fitted on the outer periphery of the outer tapered sleeve (18). After the eccentric bearing assembly is locked with the main shaft (14), it is inserted into the inner mounting hole (2-2). Both the inner tapered sleeve (17) and the outer tapered sleeve (18) are designed to be eccentric. They can be freely combined to obtain different required spring compression test strokes. A roller follower (20) is installed at the end of the push rod assembly away from the sensor assembly, and the roller follower (20) abuts against the outer wall of the bearing (32). When the main shaft (14) rotates, the bearing (32) rotates eccentrically relative to the main shaft (14), driving the push rod assembly to reciprocate relative to the sensor assembly, so that each spring (31) to be tested is in a reciprocating motion state of being pressed or released.

2. The spring fatigue testing machine according to claim 1, characterized in that: The push rod assembly includes a guide shaft fixing plate (11) and a push rod (12). A push rod mounting hole (2-1) is opened on the main fixing plate (2) at a position corresponding to each push rod (12). The push rod (12) slides through the guide shaft fixing plate (11) and the main fixing plate (2). The roller follower (20) is installed at the end of the push rod (12) facing the bearing (32). The end of the push rod (12) away from the bearing (32) is fixed with a spring positioning block (9) by a spring positioning fixing plate (10) for positioning and installing one end of the spring (31) to be tested. The guide shaft fixing plate (11) is fixed to the main fixing plate (2) along the circumferential direction by a pin.

3. The spring fatigue testing machine according to claim 2, characterized in that: The push rod (12) has two extensions (12-1) parallel to and spaced apart at one end facing the bearing (32). A groove (12-2) is formed between the two extensions (12-1). A pin hole (12-3) is opened through each extension (12-1) so that the roller follower (20) is installed in the groove (12-2) by a fixing pin (21). A countersunk hole (12-4) is opened at the end of the push rod (12) away from the bearing (32) and the spring positioning fixing plate (10) and the spring positioning block (9) are fixedly connected by bolts. A guide groove (12-5) is opened on the outer wall of the push rod (12) for inserting a guide pin (19) to guide the push rod (12) to slide relative to the guide shaft fixing plate (11) and the main fixing plate (2).

4. The spring fatigue testing machine according to claim 2, characterized in that: The sensor assembly includes a sensor fixing plate (6), a connecting rod (8), and an adjusting screw fixing plate (5). The sensor (6-5) is installed inside the sensor fixing plate (6). One end of the connecting rod (8) is connected to the sensor (6-5). The other end of the connecting rod (8) passes through the sensor fixing plate (6) and is fixed with a spring positioning block (9) by a spring positioning fixing plate (10) for positioning and installing the other end of the spring (31) to be tested. An adjusting screw (4) is installed on the adjusting screw fixing plate (5). The adjusting screw (4) rests on the sensor fixing plate (6) and is used to adjust the distance between the sensor fixing plate (6) and the push rod (12) to adapt to different specifications of springs (31) to be tested. A locking nut is installed on the adjusting screw (4) for fixing the test position.

5. The spring fatigue testing machine according to claim 4, characterized in that: The sensor mounting plate (6) has a sensor mounting groove (6-1) in the center for inserting a sensor (6-5) and fixing it through a sensor mounting hole (6-3) on the sensor mounting plate (6). A connecting rod mounting hole (6-2) is opened through the side of the sensor mounting groove (6-1) away from the sensor mounting hole (6-3) for inserting a connecting rod (8). Guide holes (6-4) are opened through both sides of the sensor mounting plate (6). Corresponding guide holes (6-4) are also opened on the guide shaft mounting plate (11) and the adjusting screw mounting plate (5). The positioning pin (7) passes through the guide shaft mounting plate (11), the sensor mounting plate (6) and the adjusting screw mounting plate (5) in sequence, so that when the adjusting screw (4) adjusts the sensor mounting plate (6), the sensor mounting plate (6) slides along the positioning pin (7) to achieve guidance.

6. The spring fatigue testing machine according to claim 1, characterized in that: The motor (29) is fixedly installed on the frame (1) by a motor fixing plate (26), and the shaft end of the motor (29) is connected to drive the main shaft (14) through a coupling (27); an oil catcher (28) is installed at the bottom of the frame (1).

7. The spring fatigue testing machine according to claim 1, characterized in that: The spindle (14) is fitted with a spindle sleeve (24) via a spacer (23). The upper end of the spindle sleeve (24) is provided with a flange (24-1) for embedding into the center hole (3-1) of the plate (3). The top end of the spindle sleeve (24) is fixed to the upper end cap (22) fitted on the spindle (14), and the lower end of the spindle sleeve (24) is fixed to the lower end cap (25) fitted on the spindle (14).

8. The spring fatigue testing machine according to claim 1, characterized in that: The top end of the spindle (14) has a hole for installing the spindle bolt (14-1) to facilitate manual rotation of the spindle (14). The spindle (14) is also provided with an external thread (14-2) for installing a round nut (30). After the eccentric bearing assembly is fitted into the spindle (14), it is then pressed in sequence with locking washers B (16) and A (15). Locking washers B (16) and A (15) are fitted by a tapered surface. The round nut (30) is pressed on the locking washer A (15). Locking washer B (16) is pressed on the upper end face of the inner tapered sleeve (17) and the outer tapered sleeve (18). The lower end face of the inner tapered sleeve (17) is pressed on the step of the spindle (14) by a washer.

9. The spring fatigue testing machine according to claim 1, characterized in that: The outer conical sleeve (18) and inner conical sleeve (17) are designed to have the same eccentricity as the rotation center. The upper end face of the outer conical sleeve (18) is provided with a scale (18-1) along the circumferential direction. The inner conical sleeve (17) is provided with a scale line (17-1) at the position corresponding to the scale (18-1). When the inner conical sleeve (17) and outer conical sleeve (18) rotate relative to each other, the eccentricity can be adjusted by adjusting the position of the scale line (17-1) relative to the scale (18-1).

10. The spring fatigue testing machine according to claim 1, characterized in that: The main fixing plate (2) has a groove (2-3) on its top for installing a protective cover (13), which covers the eccentric bearing assembly and the main shaft (14).

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