Spring fatigue strength detection device

Abstract

The invention provides a spring fatigue strength detection device, and relates to the technical field of spring fatigue strength detection, the spring fatigue strength detection device comprises a workbench, a detection cooperation block body is arranged above the workbench, and a set of servo electric push rods are fixedly installed on the top end face of the detection cooperation block body; an induction mounting groove is formed in the left side of the bottom end face of the detection matching block body, a set of frequency induction assemblies are fixedly mounted on the top face of the inner end of the induction mounting groove, a matching plate is arranged below the detection matching block body, and an induction embedded block capable of being in induction fit with the frequency induction assemblies is embedded in the left side of the matching plate; through the cooperation of the frequency timing module and the frequency sensing assembly, the stretching / retracting frequency of the servo electric push rod can be accurately monitored, and when the frequency of the device is abnormal due to a fault, a worker can be prompted to shut down for troubleshooting through sound-light alarm. The problem that an existing spring fatigue strength detection device lacks an accurate monitoring mechanism for the protection state and the working state of a servo electric push rod is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of spring fatigue strength detection, in particular to a spring fatigue strength detection device. Background Art

[0002] In the field of new material research and development and application, springs are key elastic components, and their fatigue strength is directly related to the performance stability and service life of various mechanical equipment, electronic products, etc. With the continuous advancement of new material technology, the application of new spring materials is becoming increasingly widespread, placing higher demands on the accuracy, safety, and reliability of their fatigue strength testing.

[0003] For example, patent application number CN201110202293.8 discloses a spring fatigue strength testing device, wherein a coupling is mounted on a motor shaft, the upper portion of a connecting rod is mounted in a groove of the coupling, a fastening shaft is mounted on the connecting rod, and the lower portion of the connecting rod is mounted on a pressure shaft, which is mounted on a base, a guide seat is mounted on the base, and an upper pressure cover is mounted on the pressure shaft. The spring fatigue strength testing device of the present invention can obtain accurate spring data in a very short time, is simple to operate and easy to use, and has low manufacturing, maintenance, and operating costs. It is suitable for measuring the fatigue strength of springs of different models in various industries, has a wide range of applications, and is easy to maintain.

[0004] Based on the search of the above patents and the observation of the existing spring fatigue strength testing devices on the market, it was found that there are many problems that need to be solved in practical applications: during the testing process, the spring may break due to being subjected to alternating loads for a long time, and the splashes generated when breaking can easily cause physical harm to surrounding workers. Traditional testing devices lack an accurate monitoring mechanism for the protective status and cannot determine in real time whether the protective plate is completely closed. If the protective device is not fully closed and is not discovered in time, once the spring breaks, it is easy to cause physical harm to surrounding workers, posing a safety hazard; at the same time, the existing device also has deficiencies in monitoring the working status of the servo electric push rod, and it is difficult to accurately capture abnormal changes in its extension / contraction frequency. When the servo electric push rod's operating frequency is abnormal due to mechanical failure, aging of electrical components, etc., the alarm signal cannot be issued in time, which can easily cause distortion of the test data and even cause equipment failure, seriously affecting the quality of fatigue strength testing of new material springs and the normal operation of the equipment. Summary of the Invention

[0005] The invention relates to a spring fatigue strength detection device, which solves the problem that the existing spring fatigue strength detection device lacks an accurate monitoring mechanism for the protection state and the working state of a servo electric push rod.

[0006] The present invention provides a spring fatigue strength detection device, which specifically includes: a workbench, a detection matching block is provided above the workbench, and a group of servo electric push rods are fixedly installed on the top surface of the detection matching block; the push rod end of the servo electric push rod passes through the bottom end surface of the detection matching block and is fixedly installed with a group of spring clamping heads b; an induction mounting groove is opened on the left side of the bottom end surface of the detection matching block, and a group of frequency sensing components are fixedly installed on the top surface of the inner end of the induction mounting groove, and the frequency sensing component is a proximity switch, and the sensing end of the frequency sensing component faces the lower side; a matching plate is provided below the detection matching block, and the matching plate is fixedly installed and connected to the push rod end of the servo electric push rod; an induction block that can be inductively matched with the frequency sensing component is embedded in the left side of the matching plate; when the push rod end of the servo electric push rod is in the stored state, the top surface of the matching plate contacts the bottom end surface of the detection matching block, and at this time the induction block corresponds to the position of the induction mounting groove, and the induction block is within the induction range of the frequency sensing component.

[0007] Furthermore, a left-side auxiliary block is fixedly installed on the left side of the top surface of the workbench, and a limiting slide a with an isosceles trapezoidal groove structure is provided on the right end surface of the left auxiliary block, and the limiting slide a passes through the top surface of the left auxiliary block; a right-side auxiliary block is fixedly installed on the right side of the top surface of the workbench, and a limiting slide b with an isosceles trapezoidal groove structure is provided on the left end surface of the right auxiliary block, and the limiting slide b passes through the top surface of the right auxiliary block; a limiting slider with an isosceles trapezoidal block structure is fixedly installed on the left and right end surfaces of the detection matching block, and the two limiting sliders are slidably plugged into the limiting slide a and the limiting slide b respectively.

[0008] Furthermore, a notch is provided on the top surface of the right auxiliary block, which passes through the right end surface of the right auxiliary block and the limiting slide groove b; a locking stud is fixedly installed on the right end surface of the limiting slider located on the right side, and the locking stud is slidably inserted into the inside of the notch, and a locking nut is threadedly installed on the locking stud. When the locking nut is locked along the thread of the locking stud, the locking nut is tightly attached to the right end surface of the right auxiliary block.

[0009] Furthermore, a magnetic adsorption block a is embedded in the front end face of the right auxiliary block; a front protective plate is rotatably installed on the left edge of the front end face of the left auxiliary block, and an iron adsorption block a is embedded in the right side of the rear end face of the front protective plate; when the rear end face of the front protective plate is in contact with the front end face of the right auxiliary block, the iron adsorption block a is magnetically attracted to the magnetic adsorption block a, and at this time the front protective plate completely covers and blocks the front position area between the left auxiliary block and the right auxiliary block.

[0010] Furthermore, a magnetic adsorption block b is embedded in the rear end face of the right auxiliary block; a rear protective plate is rotatably installed on the left edge of the rear end face of the left auxiliary block, and an iron adsorption block b is embedded in the right side of the front end face of the rear protective plate; when the front end face of the rear protective plate is in contact with the rear end face of the right auxiliary block, the iron adsorption block b is magnetically in contact with the magnetic adsorption block b, and at this time the rear protective plate completely covers and blocks the rear position area between the left auxiliary block and the right auxiliary block.

[0011] Furthermore, a tempered glass observation window a is installed between the front end face and the rear end face of the front protective plate; a mounting groove a is opened on the lower side of the front end face of the right auxiliary block, and a protective status monitoring switch a is fixedly installed on the rear side of the inner end of the mounting groove a. The protective status monitoring switch a is a touch switch, and the button end of the protective status monitoring switch a faces the front side; when the protective status monitoring switch a is in the non-pressed start state, the front end of its button end is located outside the mounting groove a; when the iron adsorption block a and the magnetic adsorption block a are magnetically attracted to each other, the rear end face of the front protective plate is pressed and contacted with the button end of the protective status monitoring switch a, and at this time, the protective status monitoring switch a is in the pressed start state.

[0012] Furthermore, a tempered glass observation window b is installed between the front end face and the rear end face of the rear guard plate; a mounting groove b is opened on the lower side of the rear end face of the right auxiliary block, and a protection status monitoring switch b is fixedly installed on the front side of the inner end of the mounting groove b. The protection status monitoring switch b is a touch switch, and the button end of the protection status monitoring switch b faces the rear side; when the protection status monitoring switch b is in the non-pressed start state, the front end of its button end is located outside the mounting groove b; when the iron adsorption block b is magnetically in contact with the magnetic adsorption block b, the front end face of the rear guard plate is pressed and in contact with the button end of the protection status monitoring switch b, and at this time the protection status monitoring switch b is in the pressed start state.

[0013] Furthermore, a microcontroller is provided inside the workbench, the workbench is connected to an external power supply, and the microcontroller is electrically connected to the protection status monitoring switch a, the protection status monitoring switch b, the servo electric push rod and the frequency sensing component; a group of spring clamping heads a are fixedly installed on the top surface of the workbench relative to the spring clamping head b; a control panel is installed on the front end surface of the workbench, and the control panel is electrically connected to the microcontroller; a frequency timing module is provided inside the workbench, the timing value of the frequency timing module is set according to demand, and the frequency timing module is electrically connected to the microcontroller.

[0014] Furthermore, a protection timing module a and a protection timing module b are provided inside the workbench, and both the protection timing module a and the protection timing module b are electrically connected to the microcontroller; the timing values ​​of the protection timing module a and the protection timing module b are both three seconds; an audible and visual alarm is fixedly installed on the top surface of the detection matching block, and the audible and visual alarm is electrically connected to the microcontroller.

[0015] The present invention provides a spring fatigue strength detection device, which has the following beneficial effects: The present invention can effectively shield the front and rear areas between the left auxiliary block and the right auxiliary block through the rotating closing design of the front protective plate and the rear protective plate, which can greatly reduce the risk of injury to workers caused by spring breakage and splashing during the detection process. Based on the magnetic contact between the iron adsorption block and the magnetic adsorption block, and the pressing contact design between the protective plate and the protection status monitoring switch, the closing state of the protective device can be accurately monitored. If the protection is not in place, the sound and light alarm will be triggered by the timing value, which will promptly remind the staff to improve the protective measures to avoid safety accidents caused by inadequate protection.

[0016] The present invention can accurately monitor the extension / contraction frequency of the servo electric push rod through the cooperation of the frequency timing module and the frequency sensing component. When the frequency is abnormal due to a fault in the equipment, the staff can be quickly reminded to stop the machine for investigation through sound and light alarms, effectively ensuring the quality of fatigue strength testing of new material springs and the normal operation of the equipment. In addition, the timing value of the frequency timing module can be set through the control panel based on a single group of operation cycles of the spring fatigue strength test, and the set value is greater than the single group operation time, which can meet the testing requirements of new material springs of different specifications and realize accurate detection process control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0018] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached figure: Figure 1 It shows a schematic diagram of the front axonometric structure of the front end of the present invention when the front and rear fenders are in a closed state; Figure 2 It shows a schematic diagram of the rear end axonometric structure of the front and rear fenders of the present invention in a closed state; Figure 3 It shows a schematic diagram of the front axonometric structure of the present invention when the front and rear fenders are deployed; Figure 4 The present invention shows Figure 3 A schematic diagram of the partially enlarged structure at center A; Figure 5 It shows a schematic diagram of the rear end axonometric structure of the present invention when the front and rear fenders are deployed; Figure 6 The present invention shows Figure 5 A schematic diagram of the partially enlarged structure at point B in the middle; Figure 7 It shows a schematic diagram of the front structure of the front and rear fenders of the present invention in an unfolded state; Figure 8 It shows a schematic structural diagram of the detection matching block and matching plate of the present invention in a disassembled state; Figure 9 It shows a partial cross-sectional enlarged structural schematic diagram of the induction installation slot of the present invention; Figure 10 Shown is a block diagram of the system composition of the present invention; Reference Signs List 1. Workbench; 101. Control panel; 102. Left auxiliary block; 103. Limiting slide a; 104. Right auxiliary block; 105. Limiting slide b; 106. Missing slot; 107. Spring clamping head a; 108. Magnetic adsorption block a; 109. Mounting slot a; 1010. Protection status monitoring switch a; 1011. Magnetic adsorption block b; 1012. Mounting slot b; 1013. Protection status monitoring switch b; 1014. Protection timing module a; 1015. Protection timing module b; 1016. Frequency timing module; 1017. Microcontroller; 2. Front protective plate; 201. Tempered glass observation window a; 202. Iron adsorption block a; 3. Rear protective plate; 301. Tempered glass observation window b; 302. Iron adsorption block b; 4. Detection mating block; 401. Servo electric push rod; 402. Locking stud; 403. Locking nut; 404. Sound and light alarm; 405. Spring clamping head b; 406. Mating plate; 407. Sensing insert; 408. Sensing mounting slot; 409. Limit slider; 4010. Frequency sensing component. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example: Please refer to Figures 1 to 10 : The present invention proposes a spring fatigue strength detection device, comprising: a workbench 1, a detection matching block 4 is provided above the workbench 1, a group of servo electric push rods 401 are fixedly installed on the top surface of the detection matching block 4; the push rod ends of the servo electric push rods 401 pass through the bottom end surface of the detection matching block 4 and are fixedly installed with a group of spring clamping heads b405; an induction mounting groove 408 is opened on the left side of the bottom end surface of the detection matching block 4, and a group of frequency induction components 4010 are fixedly installed on the top surface of the inner end of the induction mounting groove 408. The frequency induction components 4010 are proximity switches. The sensing end faces the lower side; a matching plate 406 is provided below the detection matching block 4, and the matching plate 406 is fixedly connected to the push rod end of the servo electric push rod 401; a sensing block 407 that can be inductively matched with the frequency sensing component 4010 is embedded in the left side of the matching plate 406; when the push rod end of the servo electric push rod 401 is in the storage state, the top surface of the matching plate 406 contacts the bottom surface of the detection matching block 4, and at this time, the sensing block 407 corresponds to the position of the sensing mounting groove 408, and the sensing block 407 is within the sensing range of the frequency sensing component 4010; the left side of the top surface of the workbench 1 A left auxiliary block 102 is fixedly installed on the right side, and a limiting slide groove a103 with an isosceles trapezoidal groove structure is opened on the right end surface of the left auxiliary block 102, and the limiting slide groove a103 passes through the top surface of the left auxiliary block 102; a right auxiliary block 104 is fixedly installed on the right side of the top surface of the workbench 1, and a limiting slide groove b105 with an isosceles trapezoidal groove structure is opened on the left end surface of the right auxiliary block 104, and the limiting slide groove b105 passes through the top surface of the right auxiliary block 104; a limiting slider 409 with an isosceles trapezoidal block structure is fixedly installed on the left and right end surfaces of the detection matching block 4, and the two limiting slides Block 409 is slidably engaged with the limiting slide a103 and the limiting slide b105 respectively; a notch 106 is provided on the top surface of the right auxiliary block 104, and the notch 106 passes through the right end surface of the right auxiliary block 104 and the limiting slide b105; a locking stud 402 is fixedly installed on the right end surface of the limiting slider 409 on the right side, and the locking stud 402 is slidably engaged with the inside of the notch 106, and a locking nut 403 is threadedly installed on the locking stud 402. When the locking nut 403 is locked along the thread of the locking stud 402, the locking nut 403 is tightly attached to the right end surface of the right auxiliary block 104.

[0022] Among them, a magnetic adsorption block a108 is embedded in the front end face of the right auxiliary block 104; a front protective plate 2 is rotatably installed on the left edge of the front end face of the left auxiliary block 102, and an iron adsorption block a202 is embedded in the right side of the rear end face of the front protective plate 2; when the rear end face of the front protective plate 2 is in contact with the front end face of the right auxiliary block 104, the iron adsorption block a202 is magnetically attracted to the magnetic adsorption block a108, and at this time the front protective plate 2 completely covers and blocks the front position area between the left auxiliary block 102 and the right auxiliary block 104 ; A magnetic adsorption block b1011 is embedded in the rear end face of the right auxiliary block 104; a rear protective plate 3 is rotatably installed on the left edge of the rear end face of the left auxiliary block 102, and an iron adsorption block b302 is embedded in the right side of the front end face of the rear protective plate 3; when the front end face of the rear protective plate 3 is in contact with the rear end face of the right auxiliary block 104, the iron adsorption block b302 is magnetically in contact with the magnetic adsorption block b1011. At this time, the rear protective plate 3 completely covers and blocks the rear position area between the left auxiliary block 102 and the right auxiliary block 104.

[0023] Among them, a tempered glass observation window a201 is jointly installed between the front end face and the rear end face of the front protective plate 2; a mounting groove a109 is opened on the lower side of the front end face of the right auxiliary block 104, and a protective status monitoring switch a1010 is fixedly installed on the rear side of the inner end of the mounting groove a109. The protective status monitoring switch a1010 is a touch switch, and the button end of the protective status monitoring switch a1010 faces the front side; when the protective status monitoring switch a1010 is in a non-pressed start state, the front end of its button end is located outside the mounting groove a109; when the iron adsorption block a202 is in magnetic contact with the magnetic adsorption block a108, the rear end face of the front protective plate 2 is pressed and contacted with the button end of the protective status monitoring switch a1010, and at this time the protective status monitoring switch a1010 is in a pressed start state; A tempered glass observation window b301 is installed between the front end face and the rear end face of the rear protective plate 3; a mounting groove b1012 is opened on the lower side of the rear end face of the right auxiliary block 104, and a protection status monitoring switch b1013 is fixedly installed on the front side of the inner end of the mounting groove b1012. The protection status monitoring switch b1013 is a touch switch, and the button end of the protection status monitoring switch b1013 faces the rear side; when the protection status monitoring switch b1013 is in the non-pressed start state, the front end of its button end is located outside the mounting groove b1012; when the iron adsorption block b302 is magnetically in contact with the magnetic adsorption block b1011, the front end face of the rear protective plate 3 is pressed and in contact with the button end of the protection status monitoring switch b1013, and at this time, the protection status monitoring switch b1013 is in the pressed start state.

[0024] Among them, a microcontroller 1017 is provided inside the workbench 1, and the workbench 1 is connected to an external power supply. The microcontroller 1017 is electrically connected to the protection status monitoring switch a1010, the protection status monitoring switch b1013, the servo electric push rod 401 and the frequency sensing component 4010; a set of spring clamping heads a107 are fixedly installed on the top surface of the workbench 1 relative to the spring clamping head b405; a control panel 101 is installed on the front surface of the workbench 1, and the control panel 101 is electrically connected to the microcontroller 1017; a frequency timing module 1016 is provided inside the workbench 1, and a frequency meter The timing value of the time module 1016 is set according to the demand, and the frequency timing module 1016 is electrically connected to the microcontroller 1017; a protection timing module a1014 and a protection timing module b1015 are also provided inside the workbench 1, and the protection timing module a1014 and the protection timing module b1015 are both electrically connected to the microcontroller 1017; the timing values ​​of the protection timing module a1014 and the protection timing module b1015 are both three seconds; an audible and visual alarm 404 is fixedly installed on the top surface of the detection matching block 4, and the audible and visual alarm 404 is electrically connected to the microcontroller 1017.

[0025] The working principle of this embodiment is as follows: The bottom of the new material spring to be tested for fatigue strength is fixedly clamped on the spring clamping head a107, and then the locking nut 403 is loosened along the locking stud 402, so that the height position of the detection matching block 4 is moved up and down through the sliding insertion of the limiting slider 409 and the limiting slide a103 and the limiting slide b105, so as to cooperate with the fixing of the top of the new material spring on the spring clamping head b405 and ensure that the current new material spring is in a natural state. When the height position is adjusted to be determined, the locking nut 403 is tightened along the locking stud 402 so that the locking nut 403 is tightly attached to the right end face of the right auxiliary block 104, thereby achieving limit fixation of the height position of the detection matching block 4; After completing the clamping of the new material spring, before conducting the fatigue strength test, in order to ensure the safety of the surrounding staff, according to regulations, the front protective plate 2 and the rear protective plate 3 need to be rotated and closed respectively, so as to block the front and rear position areas between the left auxiliary block 102 and the right auxiliary block 104, so as to avoid the new material spring from suddenly breaking and splashing during the test, which may cause harm to the surrounding staff; when the front protective plate 2 is rotated and closed, the iron adsorption block a202 is magnetically contacted with the magnet adsorption block a108, and the rear end face of the front protective plate 2 is in contact with the button of the protection status monitoring switch a1010 The key ends are pressed and contacted, and at this time, the protection status monitoring switch a1010 is in a pressed and started state. When the rear protective plate 3 is rotated and closed, the iron adsorption block b302 is magnetically contacted with the magnetic adsorption block b1011, and the front end surface of the rear protective plate 3 is pressed and contacted with the key end of the protection status monitoring switch b1013. At this time, the protection status monitoring switch b1013 is in a pressed and started state, thereby achieving safety protection. In addition, the provision of the tempered glass observation window a201 and the tempered glass observation window b301 ensures that the staff can observe the specific conditions of the new material spring on the basis of achieving safety protection; After completing the safety protection, the staff controls the servo electric push rod 401 through the control panel 101 to realize the reciprocating motion of the push rod end extending and contracting. When the push rod end of the servo electric push rod 401 extends, the protection timing module a1014 and the protection timing module b1015 are started at the same time. When the staff completes the safety protection, since the protection status monitoring switch a1010 and the protection status monitoring switch b1013 are both in the pressed start state, the microcontroller 1010 starts the operation of the protection status monitoring switch a1010 and the protection status monitoring switch b1013 based on the signal feedback of the protection status monitoring switch a1010 and the protection status monitoring switch b1013. 17 controls the protection timing module a1014 and the protection timing module b1015 to be turned off to avoid false alarms. If the safety protection is not completed, the protection timing module a1014 and the protection timing module b1015 cannot be turned off before the timing value is reached. When the timing value of the protection timing module a1014 and the protection timing module b1015 is reached, the protection timing module a1014 and the protection timing module b1015 feedback signal to the microcontroller 1017, and the microcontroller 1017 controls the sound and light alarm 404 to start, thereby realizing a warning reminder for the staff; Furthermore, when the push rod end of the servo electric push rod 401 extends, the frequency timing module 1016 is also started synchronously. The timing value of the frequency timing module 1016 needs to be set based on a single set of operation cycles of the fatigue strength test of the new material spring (i.e., the complete process of the push rod end of the servo electric push rod 401 extending to compress the new material spring and then contracting to allow the new material spring to return to its natural state). To achieve precise control, the timing value needs to be greater than the single set of operation time (for example, ≤ 1 second). The specific value can be set through the control panel 101. When the push rod end of the servo electric push rod 401 extends, the matching plate 406 moves accordingly, so that the sensing block 407 is out of the sensing range of the frequency sensing component 4010. At this time, the frequency timing module 1016 starts timing synchronously. When the push rod end of the servo electric push rod 401 contracts, the top surface of the matching plate 406 contacts the bottom surface of the detection matching block 4. At this time, the sensing block 407 is within the sensing range of the frequency sensing component 4010. When the frequency sensing component 4010 senses the sensing block 407, its feedback signal is given to the microcontroller 1017, and the microcontroller 1017 controls the frequency counter. When the module 1016 is closed to avoid false alarms, if the servo electric push rod 401 fails to extend / contract at an abnormal frequency due to a fault and fails to return the sensing block 407 to the sensing range within the time threshold preset by the frequency timing module 1016, the frequency timing module 1016 sends a timeout signal to the microcontroller 1017 when the timing value is reached. After receiving the signal, the microcontroller 1017 immediately triggers the sound and light alarm 404 to start, and through the double sound and light warnings, it promptly reminds the staff that the equipment frequency is abnormal and the equipment needs to be stopped immediately for troubleshooting, thereby ensuring that the quality of the fatigue strength test of the new material spring is not affected.

Claims

1. A spring fatigue strength testing device, characterized in that: include: A workbench, above which is provided a detection matching block, on the top surface of which a group of servo electric push rods is fixedly installed; the push rod end of the servo electric push rod passes through the bottom surface of the detection matching block and is fixedly installed with a group of spring clamping heads b; an induction mounting groove is opened on the left side of the bottom surface of the detection matching block, and a group of frequency sensing components are fixedly installed on the top surface of the inner end of the induction mounting groove, and the frequency sensing components are proximity switches, with the sensing ends of the frequency sensing components facing the lower side; a matching plate is provided below the detection matching block, and the matching plate is fixedly connected to the push rod end of the servo electric push rod; an induction block that can be inductively matched with the frequency sensing component is embedded in the left side of the matching plate; when the push rod end of the servo electric push rod is in the stored state, the top surface of the matching plate contacts the bottom surface of the detection matching block, and at this time the induction block corresponds to the position of the induction mounting groove, and the induction block is within the induction range of the frequency sensing component.

2. A spring fatigue strength detection device according to claim 1, characterized in that: A left auxiliary block is fixedly installed on the left side of the top surface of the workbench, and a limiting slide a with an isosceles trapezoidal groove structure is provided on the right end surface of the left auxiliary block, and the limiting slide a passes through the top surface of the left auxiliary block; a right auxiliary block is fixedly installed on the right side of the top surface of the workbench, and a limiting slide b with an isosceles trapezoidal groove structure is provided on the left end surface of the right auxiliary block, and the limiting slide b passes through the top surface of the right auxiliary block; a limiting slider with an isosceles trapezoidal block structure is fixedly installed on the left and right end surfaces of the detection matching block, and the two limiting sliders are respectively slidably plugged into the limiting slide a and the limiting slide b.

3. A spring fatigue strength detection device according to claim 2, characterized in that: The top surface of the right auxiliary block is provided with a notch, which passes through the right end surface of the right auxiliary block and the limiting slide groove b; a locking stud is fixedly installed on the right end surface of the limiting slider on the right side, and the locking stud is slidably inserted into the inside of the notch. A locking nut is threadedly installed on the locking stud. When the locking nut is locked along the thread of the locking stud, the locking nut is tightly attached to the right end surface of the right auxiliary block.

4. A spring fatigue strength detection device according to claim 3, characterized in that: A magnetic adsorption block a is embedded in the front end face of the right auxiliary block; a front protective plate is rotatably installed on the left edge of the front end face of the left auxiliary block, and an iron adsorption block a is embedded in the right side of the rear end face of the front protective plate; when the rear end face of the front protective plate is in contact with the front end face of the right auxiliary block, the iron adsorption block a is magnetically attracted to the magnetic adsorption block a, and at this time the front protective plate completely covers and blocks the front position area between the left auxiliary block and the right auxiliary block.

5. A spring fatigue strength testing device according to claim 4, characterized in that: A magnetic adsorption block b is embedded in the rear end face of the right auxiliary block; a rear protective plate is rotatably installed on the left edge of the rear end face of the left auxiliary block, and an iron adsorption block b is embedded on the right side of the front end face of the rear protective plate; when the front end face of the rear protective plate is in contact with the rear end face of the right auxiliary block, the iron adsorption block b is magnetically in contact with the magnetic adsorption block b, and at this time the rear protective plate completely covers and blocks the rear position area between the left auxiliary block and the right auxiliary block.

6. A spring fatigue strength testing device according to claim 5, characterized in that: A tempered glass observation window a is installed between the front end face and the rear end face of the front protective plate; a mounting groove a is opened on the lower side of the front end face of the right auxiliary block, and a protective status monitoring switch a is fixedly installed on the rear side of the inner end of the mounting groove a. The protective status monitoring switch a is a touch switch, and the button end of the protective status monitoring switch a faces the front side; when the protective status monitoring switch a is in the non-pressed start state, the front end of its button end is located outside the mounting groove a; when the iron adsorption block a and the magnetic adsorption block a are magnetically attracted to each other, the rear end face of the front protective plate is pressed and contacted with the button end of the protective status monitoring switch a, and at this time, the protective status monitoring switch a is in the pressed start state.

7. A spring fatigue strength testing device according to claim 6, characterized in that: A tempered glass observation window b is installed between the front end and rear end of the rear guard plate; a mounting groove b is provided on the lower side of the rear end of the right auxiliary block, and a protection status monitoring switch b is fixedly installed on the front side of the inner end of the mounting groove b. The protection status monitoring switch b is a touch switch, and the button end of the protection status monitoring switch b faces the rear side; when the protection status monitoring switch b is in the non-pressed start state, the front end of its button end is located outside the mounting groove b; when the iron adsorption block b is magnetically in contact with the magnetic adsorption block b, the front end of the rear guard plate is pressed and in contact with the button end of the protection status monitoring switch b, and at this time, the protection status monitoring switch b is in the pressed start state.

8. A spring fatigue strength testing device according to claim 7, characterized in that: A microcontroller is provided inside the workbench, and the workbench is connected to an external power supply. The microcontroller is electrically connected to the protection status monitoring switch a, the protection status monitoring switch b, the servo electric push rod and the frequency sensing component; a group of spring clamping heads a are fixedly installed on the top surface of the workbench relative to the spring clamping head b; a control panel is installed on the front end surface of the workbench, and the control panel is electrically connected to the microcontroller; a frequency timing module is provided inside the workbench, the timing value of the frequency timing module is set according to demand, and the frequency timing module is electrically connected to the microcontroller.

9. A spring fatigue strength testing device according to claim 8, characterized in that: The workbench is also equipped with a protection timing module a and a protection timing module b, which are both electrically connected to the microcontroller; the timing values ​​of the protection timing module a and the protection timing module b are both three seconds; an audible and visual alarm is fixedly installed on the top surface of the detection matching block, and the audible and visual alarm is electrically connected to the microcontroller.

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