A Method for Accelerated Test of Recoil Spring of Light Weapon in Marine Atmospheric Environment-Load

Abstract

The present invention discloses a method for accelerated testing of a recoil spring of a light weapon under marine atmospheric environment - load, which conducts multi - environmental factor tests and compression fatigue tests on the recoil spring specimen. In the compression fatigue test, the compression - reciprocating stroke of the recoil spring is consistent with the compression - rebound stroke of the recoil spring under the actual firing condition of the light weapon, that is, it makes a reciprocating compression - rebound movement from the compressed position in the assembled state to the compressed position in the firing state of the light weapon, reflecting the reciprocating compression - rebound effect on the recoil spring when the light weapon fires, and truly simulating the compression fatigue damage of the recoil spring under large - stroke compression and automatic release of reciprocating acting forces when the light weapon fires.

Description

Technical Field

[0001] The present invention relates to the technical field of recoil spring acceleration test for small arms, and particularly relates to a method for accelerating the test of the recoil spring of small arms in a marine atmospheric environment - load. Background Art

[0002] The recoil spring is a spring that slows down the backward movement of the bolt when the firearm is fired and pushes it back to the front end. It is one of the key parts to achieve the automation of the firearm. When the firearm is fired, the recoil spring is compressed as the bolt moves backward, and releases energy when compressed and extended to achieve the reset of the bolt and feeding. During the long-term service of the firearm, the recoil spring deteriorates in performance due to the coupling effect of environmental factors such as temperature, humidity, and corrosive media, as well as the reciprocating fatigue load of compression - extension. Especially in the marine atmospheric environment of high temperature, high humidity, and high salt spray, the recoil spring shortens in length, corrodes and fatigues and breaks due to corrosion, stress relaxation, etc., seriously affecting the use of the firearm. To quickly evaluate and verify the environmental adaptability of the recoil spring, an accelerated test method that can quickly simulate the natural environmental factors and the action of the compression fatigue load is needed to achieve the purpose of rapid evaluation, screening, and improvement.

[0003] Currently, the environmental test / performance assessment of the recoil spring mainly considers single environmental factor tests or compression fatigue tests, and it is difficult to accurately simulate the combined application of environmental factors and compression fatigue load on the recoil spring when it is in service in the marine atmospheric environment. Especially, it is impossible to simulate the influence of the combined action of multiple factors such as humidity, salt spray, and large - stroke (distance not less than 70 mm) compression fatigue load on the length / spring force or service life of the recoil spring, seriously affecting the reliability of the test results.

[0004] On the other hand, when conducting a compression fatigue test on the recoil spring, a large recoil force will be generated during the rebound process of the recoil spring. This recoil force acts on the swing part and drives the swing part to hit the limit part, generating noise higher than 80 decibels (similar to the sound of a hammer hitting a steel plate). Therefore, how to limit the swing part at a specified position in a low - noise manner during the compression fatigue test of the recoil spring is a problem to be solved. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a method for accelerating the test of the recoil spring of small arms in a marine atmospheric environment - load. This method can simulate the performance changes of the recoil spring for firearms under the combined action of natural environmental factors and large - stroke compression fatigue load, and overcomes the deficiency of poor correlation between single - item accelerated tests and natural environmental tests.

[0006] The present invention adopts the following technical solutions.

[0007] A method for accelerating the test of the recoil spring of small arms in a marine atmospheric environment - load, which conducts a combined test of multi - environmental factor tests and compression fatigue tests. The steps include;

[0008] Step 1: Conduct multi-environment factor tests on the recoil spring specimens. A single test cycle includes two cycles. In each cycle, high temperature and salt spray act alternately on the recoil spring in a static compression state. The time for each cycle is 72 h. Among them, the 0 h - 48 h is the high temperature test, and the 48 h - 72 h is the salt spray test. Test conditions: The temperature T of the high temperature test = the tempering temperature of the recoil spring material - (30 - 50) °C (take an integer). The salt spray test uses a 3.5% NaCl solution with a pH value of 4.5 - 5.5 and continuous spraying.

[0009] During the environmental factor test, the recoil spring is always in a compressed state, and the compression amount of the recoil spring in this compressed state is the same as its actual compression amount when assembled in a light weapon (in a compressed state).

[0010] Step 2: Conduct compression fatigue tests on the recoil spring specimens. The test time for a single cycle is 5 minutes. Test conditions: The compression stroke of the recoil spring is from its compression amount in the assembled state to its compression amount in the firing state, making a reciprocating compression-free release movement. The test frequency is controlled at 1 - 5 Hz.

[0011] In the compression fatigue test, the compression reciprocating stroke of the recoil spring is consistent with the compression-rebound stroke of the recoil spring under the actual firing condition of the light weapon, that is, making a reciprocating compression-rebound movement from the compressed position in the assembled state to the compressed position in the firing state of the light weapon, reflecting the reciprocating compression-rebound effect on the recoil spring when the light weapon fires, and truly simulating the compression fatigue damage of the recoil spring under the reciprocating force of large-stroke compression and automatic release when the light weapon fires.

[0012] Step 3: Implement Step 1 and Step 2 one or more times.

[0013] In the present invention, a compression fatigue test is carried out using a recoil spring test device. The recoil spring test device includes: a frame. A drive system is provided below the operation table of the frame. The output shaft of the drive system is connected to a concentric wheel. A dial is provided on the end face of the concentric wheel. A rotatable self-separating link is provided on the side of the concentric wheel. The lower end of the self-separating link cooperates with the dial, and the upper end is hinged to one end of a pull rod. The other end of the pull rod is hinged to a swing seat horizontally arranged on the operation table. On the operation table and on the left side of the swing seat, there is a first seat body, and on the right side of the swing seat, there is a second seat body. The recoil spring mounting rod is fixedly connected to the first seat body and the second seat body. The swing seat is movably sleeved on the recoil spring mounting rod. When the drive system operates, it drives the concentric wheel to rotate counterclockwise. During the process of the dial contacting the lower end of the self-separating link, it drives the self-separating link to rotate clockwise (substantially by pressing the self-separating link with the dial), and drives the pull rod to move rightward through the self-separating link, thereby driving the swing seat to move rightward and compress the recoil spring specimen. After the dial is separated from the self-separating link, the recoil spring specimen drives the swing seat to reset, thereby driving the pull rod and the self-separating link to reset.

[0014] Adopting this solution can achieve the compression and automatic release of the recoil spring of a light weapon under a large stroke. Through the repeated compression - rebound method, it truly reproduces the compression fatigue damage caused by the repeated compression - rebound of the recoil spring of a light weapon in the firing state, ensures the consistency of the damage mechanism of the recoil spring under test conditions and natural environmental conditions, and improves the acceleration performance.

[0015] Preferably, every time the concentric wheel rotates one circle, the recoil spring specimen completes one compression - free release action.

[0016] Furthermore, a cam or an eccentric wheel is used to replace the concentric wheel and the dial block.

[0017] To improve the stability of the recoil spring test device during the test, through - holes are provided on the first seat body and / or the second seat body. The diameter of the through - hole is larger than the diameter of the recoil spring mounting rod. A vertically arranged screw hole or pin hole is provided directly above the through - hole. A limit screw or a pin is fitted in the screw hole for axially limiting the recoil spring mounting rod.

[0018] In order to be able to limit the swing part to a specified position, a detachable hard rubber sleeve is sleeved on the recoil spring mounting rod and located between the first seat body and the swing seat. Further, when testing recoil springs of different specifications, a hard rubber sleeve of an appropriate length can be selected according to the compression amount of the recoil spring. This solution has good versatility. By using a set of main body structures and matching hard rubber sleeves of different lengths, various specifications of recoil springs can be adapted, and the replacement is simple and easy to operate.

[0019] The second object of the present invention is to provide a method for accelerating the test of a recoil spring of a light weapon in a marine atmospheric environment - load, which can limit the swing part to a specified position in a low - noise manner.

[0020] As one of the preferred solutions, a powerful electromagnet is fixedly arranged on the right side wall of the first seat body, and a magnetic block is fixedly arranged on the left side wall of the swing seat. The area where the powerful electromagnet and the magnetic block are close to each other can form like - named magnetic poles. After the powerful electromagnet is energized, it can repel the magnetic block and make the swing seat stable at the specified position. In the initial state, the swing seat is at the specified position, the reset spring specimen is in a free state, and the powerful electromagnet is in a de - energized state. It also includes a controller. The controller is connected to the powerful electromagnet and the drive system. A program that can run on the processing module is stored in the storage module of the controller. When the processing module executes the program, the following steps are realized:

[0021] Step 11, controlling the drive system to operate so that the concentric wheel rotates at a preset speed;

[0022] Step 12, when the dial block just disengages from the self - separating connecting rod, controlling the powerful electromagnet to be energized;

[0023] Step 13, when the shifting block contacts the self-separating link again, control the power-off of the powerful electromagnet;

[0024] Step 14, repeat Steps 12 - 13.

[0025] As the second preferred solution, a powerful electromagnet is fixedly arranged on the right side wall of the first seat body, and a second powerful electromagnet is fixedly arranged on the left side wall of the second seat body. After the powerful electromagnet and the second powerful electromagnet are simultaneously powered on, both the powerful electromagnet and the second powerful electromagnet generate an adsorption force on the swing seat and can make the swing seat stable at the specified position; in the initial state, the swing seat is located at the specified position, the reset spring specimen is in a free state, and the powerful electromagnet and the second powerful electromagnet are in a power-off state; it further includes a controller, the controller is connected to the powerful electromagnet, the second powerful electromagnet, and the drive system, and a program that can run on the processing module is stored on the storage module of the controller. When the processing module executes the program, the following steps are realized:

[0026] Step 21, control the drive system to operate so that the concentric wheel rotates at a preset speed;

[0027] Step 22, when the shifting block just disengages from the self-separating link, control the simultaneous power-on of the powerful electromagnet and the second powerful electromagnet;

[0028] Step 23, when the shifting block contacts the self-separating link again, control the simultaneous power-off of the powerful electromagnet and the second powerful electromagnet;

[0029] Step 24, repeat Steps 22 - 23.

[0030] (1) The present invention provides a method for accelerated testing of the recoil spring of a light weapon in a marine atmospheric environment - load. By analyzing the factors such as strength, duration, occurrence frequency, and time ratio that play a key role in damaging the recoil spring of a light weapon in a marine atmospheric environment, environmental factors such as temperature, salt spray, static compressive stress, and compressive - free release reciprocating fatigue force, as well as loads, are applied to the recoil spring, truly reproducing the actual situations such as stress relaxation and corrosion caused by temperature, salt spray erosion, and static compressive stress of the recoil spring inside the light weapon in the storage state, and corrosion fatigue damage caused by large - stroke compressive fatigue in the firing state in the marine atmospheric environment, greatly improving the coincidence degree between the simulation of multi - factor coupling effects in the laboratory and the actual situation, and being able to quickly and accurately evaluate the environmental adaptability of the recoil spring of a light weapon through short - term laboratory accelerated testing;

[0031] (2) The present invention adopts a recoil spring test device with a specific structure, which can realize the compression and automatic release of the recoil spring of light weapons under a large stroke, effectively simulating the use state of the recoil spring under the firing state of the firearm. The device has the characteristics of simple structure, convenient installation and easy operation; through the position limiting design, the compression amount and compression displacement of the recoil spring can be accurately controlled, and it is also convenient to use the speed controller and counter for automatic control and real-time recording of the number of recoil spring rebounds;

[0032] (3) The marine atmosphere environment-load acceleration test method for the light weapon recoil spring provided by the present invention is basically consistent with the damage and destruction of the recoil spring in the natural marine atmosphere environment, and reproduces the main damage forms of the recoil spring in the marine atmosphere environment, such as corrosion and spring force reduction. Compared with the natural atmospheric environment test, the acceleration rate can reach more than five times, and the acceleration is obvious;

[0033] (4) By adopting the preferred embodiment of the present invention, when a compression fatigue test is carried out on the recoil spring, the noise during the rebound process of the recoil spring does not exceed 50 decibels, and the swinging member can be limited to a specified position with low noise during the compression fatigue test of the recoil spring; during the rebound process of the recoil spring, there is no high noise because there is no swinging member hitting the limit member, and the small noise mainly comes from the friction between the recoil spring and the swinging member and the sound generated by the shifting block shifting the self-disengaging connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is the marine atmosphere environment-load simulation accelerated test spectrum of the recoil spring in the embodiment;

[0035] Figure 2 It is a schematic diagram of a static compression state of the recoil spring in the embodiment when it is assembled;

[0036] Figure 3 It is a schematic diagram of the compression-free release reciprocating stroke of the recoil spring in the firing state in the embodiment;

[0037] Figure 2 and Figure 3 In the figure, L1 represents the length of the recoil spring in the assembled position, L0 represents the length of the recoil spring in the free state, L2 represents the length of the recoil spring in the fired state, and S represents the compression-rebound reciprocating stroke of the recoil spring;

[0038] Figure 4 , Figure 5 Schematic diagram of the structure of the recoil spring testing device in Example 1;

[0039] Figure 6Local damage diagram (corrosion morphology) of the recoil spring after undergoing acceleration tests and natural marine atmospheric environment tests in Example 1. Among them, part (a) in the figure corresponds to the natural marine atmospheric environment, and part (b) corresponds to the laboratory acceleration test;

[0040] Figure 7 Results of the performance change law of the recoil spring after undergoing acceleration tests and natural marine atmospheric environment tests in Example 1;

[0041] Figure 8 、 Figure 9 Schematic structural diagram of the recoil spring testing device in Example 2;

[0042] Figure 10 Schematic structural diagram of the recoil spring testing device in Example 3. Specific implementation manners

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. However, the description of the following embodiments is only used to help understand the principle and its core idea of the present invention, and does not limit the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, improvements made to the present invention without departing from the principle of the present invention also fall within the protection scope of the claims of the present invention.

[0044] Example 1

[0045] First, the recoil spring testing device in this embodiment will be described. As shown in Figure 4 and Figure 5As shown in the figure, the recoil spring testing device includes: a frame 1. A drive system (motor) is arranged below the operating table 2 of the frame 1. The output shaft of the drive system is connected to a concentric wheel 3. A dial block 4 is arranged on the end face of the concentric wheel 3. A rotatable self-separating connecting rod 5 is arranged on the side of the concentric wheel 3. The lower end of the self-separating connecting rod 5 cooperates with the dial block 4, and the upper end is hinged to one end of a pull rod 15. The other end of the pull rod 15 is hinged to a swing seat 6 horizontally arranged on the operating table 2. On the operating table 2 and on the left side of the swing seat 6, there is a first seat body 7, and on the right side of the swing seat 6, there is a second seat body 8. A recoil spring mounting rod 9 is fixedly connected to the first seat body 7 and the second seat body 8. The swing seat 6 is movably sleeved on the recoil spring mounting rod 9. When the drive system operates, it drives the concentric wheel 3 to rotate counterclockwise. During the process that the dial block 4 contacts the lower end of the self-separating connecting rod 5, it drives the self-separating connecting rod 5 to rotate clockwise, and drives the pull rod 15 to move rightward through the self-separating connecting rod 5, thereby driving the swing seat 6 to move rightward and compress the recoil spring specimen 14. After the dial block 4 is separated from the self-separating connecting rod 5, the recoil spring specimen 14 drives the swing seat 6 to reset, thereby driving the pull rod 15 and the self-separating connecting rod 5 to reset. Among them, through holes are arranged on the first seat body 7 and / or the second seat body 8. The diameter of the through holes is larger than the diameter of the recoil spring mounting rod 9. A vertical screw hole or pin hole is arranged directly above the through hole. A limit screw or pin 16 is fitted in the screw hole for axially limiting the recoil spring mounting rod 9. A detachable hard rubber sleeve 10 is sleeved on the recoil spring mounting rod 9 between the first seat body 7 and the swing seat 6. When testing recoiling springs of different specifications, a hard rubber sleeve 10 with a suitable length can be selected according to the compression amount of the recoil spring. In this embodiment, by using the main structure of a set of recoil spring testing device and matching hard rubber sleeves 10 with different lengths, various specifications of recoil springs can be adapted, and the replacement is simple, convenient and easy to operate. When replacing the recoil spring and the hard rubber sleeve 10, first remove the limit screw or pin 16, then horizontally draw out the recoil spring mounting rod 9 to the right, then place the new hard rubber sleeve and recoil spring in place, and then insert the recoil spring mounting rod 9 and fix it. During the use process, every time the concentric wheel 3 rotates one circle, the recoil spring specimen 14 completes a compression-free release action, Figures 3 to 2 The state shown.

[0046] In this embodiment, an actual product of a certain type of gun recoil spring is used as the test sample. The recoil spring is a cylindrical helical spring, made of stainless steel, and the tempering temperature is about 200°C. The free length of this recoil spring is about 300mm; it is in a compressed state when assembled in the firearm, and the compressed length is about 170mm; when the firearm fires, the recoil spring is subjected to repeated compression-free rebound, and the one-time compression stroke is: compressed from 170mm to about 77mm, and then restored to 170mm.

[0047] The design of simulated accelerated test conditions mainly considers the factors that play a key role in damaging the recoil spring in the marine atmospheric environment, including the temperature, humidity, salt spray, static compression stress when the firearm is in the storage state, and the combined effect of the dynamic compression stress when in use. Taking multi-environment factor tests and compression fatigue tests to form an accelerated test spectrum block, the accelerated environmental test spectrum is shown in Figure 1 :

[0048] One test cycle of this multi-environment factor test includes 2 cycles, a total of 6 days, with each cycle lasting 3 days. Each time, high temperature and salt spray act alternately on the recoil spring in the compressed state. The test conditions for each are shown in Figure 1 , where:

[0049] High temperature test: Using high temperature can accelerate the degradation of spring performance (such as stress relaxation), and comprehensively considering that the temperature exceeding the tempering temperature (200 °C) of the recoil spring material will change its structure, the test conditions for the high temperature test are determined as follows: Temperature T = tempering temperature of the recoil spring material - (30 - 50) °C (rounded to the nearest integer) = 150 °C. The test time for a single cycle is 2 days. This temperature can ensure that the structure and mechanism of the recoil spring material are not changed, while accelerating the performance degradation of the recoil spring to simulate the stress relaxation, etc. that occurs as the recoil spring ages over time, resulting in a decrease in length, mechanical properties, etc.;

[0050] Salt spray test: Using a 3.5% NaCl solution, adjusting the pH value to 4.5 - 5.5 with dilute sulfuric acid to simulate the effects of salt spray and acid rain in the marine atmospheric environment. The test time for a single cycle is 1 day;

[0051] Compression fatigue test: The time for a single test cycle is 5 minutes. The compression stroke of the recoil spring is the same as that in the actual firing state of the firearm, compressed from 170 mm in the assembled state to 77 mm at firing, and then restored to 170 mm. Make a reciprocating motion of large stroke compression - free release in this way, and the test frequency is 1 Hz.

[0052] According to the Figure 1 shown accelerated test spectrum, use a DGF thermal aging test chamber and an FY-10E salt spray test to conduct multi-environment factor tests, and use a light weapon recoil spring test device to conduct compression fatigue tests. A total of 4 cycle periods of laboratory simulated accelerated tests are carried out, and the spring force and spring length are detected after each cycle.

[0053] The natural environment test was carried out under the shed on Yongxing Island in the Xisha Islands. The return spring in the free state was compressed to 170 mm by a return spring test device and placed under the shed for exposure test. After the natural environment test, a compression fatigue test was carried out. The test frequency was 1 Hz, and the detection periods were 3 months, 6 months, 12 months, and 18 months. The length and spring force of the samples were detected in each period. The consistency of the damage characteristics and performance laws of the return spring in the simulated acceleration test and the natural environment test was judged by the change of length or spring force. Based on the principle of equivalent performance change, the acceleration relationship between the two test environments was evaluated.

[0054] Experimental results - Damage form of the return spring: The return spring is assembled inside the firearm. In the marine atmospheric environment, due to temperature, salt spray, static compressive stress, and the reciprocating compression - release action during firing, stress relaxation, corrosion, or corrosion fatigue may occur in the return spring, resulting in a decrease in its resilience performance. The surface corrosion morphology of the return spring was observed and compared using a metallographic microscope. See Figure 6 As shown, the damage forms of the return spring under the acceleration test and the natural environment test were evaluated. It can be seen that the return spring in both test environments showed pitting corrosion characteristics, indicating that the corrosion characteristics of the return spring in the two test environments were consistent.

[0055] Experimental results - Performance law of the return spring: Taking the length of the return spring as an index, the chart comparison method was used to judge the consistency of the performance change laws of the return spring in the acceleration test and the marine atmospheric natural environment test. See Figure 7 From Figure 7 it can be seen that the length change trends of the return spring in the acceleration test and the marine atmospheric natural environment test were basically the same. Considering the change laws and damage forms of the return spring in the two test environments, it shows that the laboratory acceleration has good simulation.

[0056] The acceleration relationship in the return spring test was evaluated using the acceleration conversion factor (ASF) method. Table 1 gives the time for the return spring to reach the same length in the two test environments.

[0057] Table 1 Test times for the return spring to reach the same length in the two test environments

[0058]

[0059] The test results show that the laboratory acceleration test has acceleration performance. The acceleration multiple of the laboratory test for 20 days reaches 6 times, and the acceleration performance is obvious.

[0060] Example 2

[0061] This embodiment provides a method for the marine atmospheric environment-load acceleration test of a light weapon recoil spring that can limit the swinging part to a specified position in a low-noise manner. The main steps and the main structure refer to Embodiment 1. The main difference from Embodiment 1 is as follows: Combined with Figure 8 and Figure 9 As shown, the hard rubber sleeve 10 is cancelled, and the frame 1, the operating table 2, the concentric wheel 3, the dial block 4, the self-separating connecting rod 5, the swinging seat 6, the first seat body 7, the second seat body 8, the recoil spring mounting rod 9, and the limit screw or pin 16 are all made of stainless steel; a powerful electromagnet 11 is fixedly arranged on the right side wall of the first seat body 7, and a magnetic block 12 is fixedly arranged on the left side wall of the swinging seat 6. The area where the powerful electromagnet 11 and the magnetic block 12 are close to each other can form like-named magnetic poles. After the powerful electromagnet 11 is energized, it can repel the magnetic block 12 and can make the swinging seat 6 stable at the specified position; in the initial state, the swinging seat 6 is at the specified position, the reset spring specimen 14 is in a free state, and the powerful electromagnet 11 is in a de-energized state; it further includes a controller. The controller is connected to the powerful electromagnet 11 and the drive system. The storage module of the controller stores a program that can run on the processing module. When the processing module executes the program, the following steps are realized:

[0062] Step 11, control the drive system to run so that the concentric wheel 3 rotates at a preset speed;

[0063] Step 12, when the dial block 4 just breaks away from the self-separating connecting rod 5, control the powerful electromagnet 11 to be energized;

[0064] Step 13, when the dial block 4 contacts the self-separating connecting rod 5 again, control the powerful electromagnet 11 to be de-energized;

[0065] Step 14, repeatedly execute Step 12 - Step 13.

[0066] In this embodiment, when it is necessary to conduct tests on recoil springs of different specifications, those skilled in the art can select a powerful electromagnet 11 with an appropriate magnetic force according to the compression amount of the recoil spring, or can change the magnetic force by changing the current of the powerful electromagnet 11. No matter which method is adopted, as long as a powerful electromagnet 11 with an appropriate magnetic force can make the swinging seat 6 stable at the specified position after being energized. The key of this embodiment is to make the swinging seat 6 stable at the specified position by means of the mutual repulsion between the powerful electromagnet 11 and the magnetic block on the swinging seat.

[0067] Embodiment 3

[0068] This embodiment also provides a method for the marine atmospheric environment-load acceleration test of a light weapon recoil spring that can limit the swinging part to a specified position in a low-noise manner. The main steps and the main structure refer to Embodiment 1. The main difference from Embodiment 1 is as follows: Combined with Figure 10As shown in the figure, the rigid rubber sleeve 10 is cancelled, and the frame 1, the operating table 2, the concentric wheel 3, the shifting block 4, the self-separating connecting rod 5, the swing seat 6, the first seat body 7, the second seat body 8, the return spring mounting rod 9, and the limit screw or pin 16 are all made of stainless steel; a powerful electromagnet 11 is fixedly arranged on the right side wall of the first seat body 7, and a second powerful electromagnet 13 is fixedly arranged on the left side wall of the second seat body 8. After the powerful electromagnet 11 and the second powerful electromagnet 13 are simultaneously energized, both the powerful electromagnet 11 and the second powerful electromagnet 13 generate an adsorption force on the swing seat 6 and can make the swing seat 6 stable at a specified position; in the initial state, the swing seat 6 is located at the specified position, the return spring specimen 14 is in a free state, and the powerful electromagnet 11 and the second powerful electromagnet 13 are in a power-off state; a controller is further included. The controller is connected to the powerful electromagnet 11, the second powerful electromagnet 13, and the drive system. A program that can run on the processing module is stored on the storage module of the controller. When the processing module executes the program, the following steps are implemented:

[0069] Step 21, control the drive system to operate so that the concentric wheel 3 rotates at a preset speed;

[0070] Step 22, when the shifting block 4 and the self-separating connecting rod 5 are just separated, control the powerful electromagnet 11 and the second powerful electromagnet 13 to be simultaneously energized;

[0071] Step 23, when the shifting block 4 and the self-separating connecting rod 5 contact again, control the powerful electromagnet 11 and the second powerful electromagnet 13 to be simultaneously powered off;

[0072] Step 24, repeatedly execute Step 22 - Step 23.

[0073] In this embodiment, when it is necessary to conduct tests on return springs of different specifications, those skilled in the art can select the powerful electromagnet 11 and the second powerful electromagnet 13 with appropriate magnetic forces according to the compression amount of the return spring, or can change the magnetic force by changing the current of the powerful electromagnet 11 and the second powerful electromagnet 13. No matter which method is adopted, as long as the selected powerful electromagnet with appropriate magnetic force can make the swing seat 6 stable at the specified position after being energized. The key of this embodiment lies in using the powerful electromagnet 11 and the second powerful electromagnet 13 to simultaneously adsorb the swing seat 6 in opposite directions, so as to make it stable at the specified position.

[0074] In other embodiments, a cam or an eccentric wheel can also be used to replace the concentric wheel 3 and the shifting block 4.

[0075] In Examples 2 and 3, when a compression fatigue test is carried out on the recoil spring, the noise during the rebound process of the recoil spring does not exceed 50 decibels, and the swinging part can be limited to a specified position with low noise during the compression fatigue test of the recoil spring; during the rebound process of the recoil spring, there is no high noise because there is no swinging part hitting the limit part, and the smaller noise mainly comes from the friction between the recoil spring and the swinging part and the sound generated by the shift block shifting the self-disengaging connecting rod.

Claims

1. A method for accelerated ocean atmosphere environment-load test of a recoil spring of a light weapon, characterized in that: Conduct a combined test of multi-environment factor test and compression fatigue test. The steps include: Step 1: Conduct a multi-environment factor test on the recoil spring specimen. A single test cycle includes two cycles. In each cycle, high temperature and salt spray act on the recoil spring in a static compression state alternately. The time for each cycle is 72h. Among them, the 0h - 48h is the high temperature test, and the 48h - 72h is the salt spray test. Test conditions: The temperature T of the high temperature test = tempering temperature of the recoil spring material - (30 - 50)°C, where (30 - 50)°C takes an integer. The salt spray test uses a 3.5% NaCl solution with a pH value of 4.5 - 5.5 and continuous spraying. Step 2: Conduct a compression fatigue test on the recoil spring specimen. The test time for a single cycle is 5 minutes. Test conditions: The compression stroke of the recoil spring is to perform a compression-free release reciprocating motion from the compression amount in its assembled state to the compression amount in the firing state. The test frequency is controlled at 1 - 5Hz. Step 3: Implement Step 1 and Step 2 one or more times. Use a recoil spring testing device to conduct a compression fatigue test. The recoil spring testing device includes: a frame (1). A drive system is provided below the operating table (2) of the frame (1). The output shaft of the drive system is connected to a concentric wheel (3). A dial block (4) is provided on the end face of the concentric wheel (3). A rotatable self-separating connecting rod (5) is provided on the side of the concentric wheel (3). The lower end of the self-separating connecting rod (5) cooperates with the dial block (4), and the upper end is hinged to one end of a pull rod (15). The other end of the pull rod (15) is hinged to a swing seat (6) horizontally arranged on the operating table (2). On the operating table (2) and on the left side of the swing seat (6), a first seat body (7) is provided, and on the right side of the swing seat (6), a second seat body (8) is provided. The recoil spring mounting rod (9) is fixedly connected to the first seat body (7) and the second seat body (8). The swing seat (6) is movably sleeved on the recoil spring mounting rod (9). When the drive system operates, it drives the concentric wheel (3) to rotate counterclockwise. During the process of the dial block (4) contacting the lower end of the self-separating connecting rod (5), it drives the self-separating connecting rod (5) to rotate clockwise, and drives the pull rod (15) to move rightward through the self-separating connecting rod (5), thereby driving the swing seat (6) to move rightward and compress the recoil spring specimen. After the dial block (4) disengages from the self-separating connecting rod (5), the recoil spring specimen drives the swing seat (6) to reset, thereby driving the pull rod (15) and the self-separating connecting rod (5) to reset.

2. The marine atmospheric environment-load acceleration test method according to claim 1, wherein: Every time the concentric wheel (3) rotates one circle, the recoil spring specimen completes one compression-free release action.

3. The marine atmospheric environment-load acceleration test method according to claim 2, wherein: Use a cam or an eccentric wheel to replace the concentric wheel (3) and the dial block (4).

4. The marine atmospheric environment-load acceleration test method according to claim 3, characterized in that: A through hole is provided on the second seat body (8). The diameter of the through hole is larger than the diameter of the recoil spring mounting rod (9). A vertical screw hole or pin hole is provided directly above the through hole. A limit screw or pin is fitted in the screw hole or pin hole for axially limiting the recoil spring mounting rod (9).

5. The marine atmospheric environment-load acceleration test method according to any one of claims 1-4, characterized in that: A detachable hard rubber sleeve (10) is sleeved on the recoil spring mounting rod (9) between the first seat body (7) and the swing seat (6).

6. The marine atmospheric environment-load acceleration test method according to any one of claims 1-4, characterized in that: A strong electromagnet (11) is fixedly arranged on the right side wall of the first seat body (7), and a magnetic block (12) is fixedly arranged on the left side wall of the swing seat (6). The strong electromagnet (11) and the magnetic block (12) are close to each other in the area where they can form magnetic poles of the same name. After the strong electromagnet (11) is energized, it can repel the magnetic block (12) and stabilize the swing seat (6) at a specified position. In an initial state, the swing seat (6) is located at the specified position, the reset spring sample is in a free state, and the strong electromagnet (11) is in a power-off state. The controller is also included. The controller is connected to the strong electromagnet (11) and the drive system. The storage module of the controller stores a program that can be run on the processing module. When the processing module executes the program, the following steps are implemented: Step 11, controlling the driving system to operate so that the concentric wheel (3) rotates at a preset speed; Step 12, when the shift block (4) and the self-separating connecting rod (5) are just separated, the strong electromagnet (11) is controlled to be energized; Step 13, when the shift block (4) contacts the self-separating connecting rod (5) again, the powerful electromagnet (11) is controlled to be de-energized; Step 14, repeat steps 12 to 13.

7. The marine atmospheric environment-load acceleration test method according to any one of claims 1-4, characterized in that: A strong electromagnet (11) is fixedly arranged on the right side wall of the first seat body (7), and a second strong electromagnet (13) is fixedly arranged on the left side wall of the second seat body (8). When the strong electromagnet (11) and the second strong electromagnet (13) are energized at the same time, the strong electromagnet (11) and the second strong electromagnet (13) both generate an adsorption force on the swing seat (6), and can stabilize the swing seat (6) at a specified position; in an initial state, the swing seat (6) is located at the specified position, the reset spring sample is in a free state, and the strong electromagnet (11) and the second strong electromagnet (13) are in a power-off state; and a controller is also included, the controller is connected to the strong electromagnet (11), the second strong electromagnet (13), and the drive system, and a storage module of the controller stores a program that can be run on the processing module, and when the processing module executes the program, the following steps are implemented: Step 21, controlling the driving system to operate so that the concentric wheel (3) rotates at a preset speed; Step 22, when the shift block (4) is just separated from the self-separating connecting rod (5), the strong electromagnet (11) and the second strong electromagnet (13) are controlled to be energized at the same time; Step 23, when the shift block (4) contacts the self-separating connecting rod (5) again, the powerful electromagnet (11) and the second powerful electromagnet (13) are controlled to be powered off simultaneously; Step 24, repeat steps 22 to 23.

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