阅读说明：本技术 一种高频击针簧疲劳试验装置及试验方法 (High-frequency striker spring fatigue test device and test method ) 是由 陈蕊 刘俊军 程靖 张萍 魏文明 南博 张冬红 韩二伟 程亮 孙兵 陈慧媛 白 于 2021-07-30 设计创作，主要内容包括：本发明提出一种高频击针簧疲劳试验装置及试验方法,该装置采用凸轮工作+击针簧瞬态加热+冷却润滑油工作模式,实现了高频模拟实弹射击工况,解决了击针簧疲劳测试装置中的传动机构易于磨损、使用寿命有限的问题。装置采用压力传感器、位移传感器,实时采集击针簧受力、变形参数量,了解击针簧全寿命受力变形变化过程。(The invention provides a high-frequency firing pin spring fatigue test device and a test method, the device adopts the working modes of cam working, firing pin spring transient heating and lubricating oil cooling, realizes the high-frequency simulated firing condition, and solves the problems that a transmission mechanism in the firing pin spring fatigue test device is easy to wear and has limited service life. The device adopts a pressure sensor and a displacement sensor, collects the stress and deformation parameters of the striker spring in real time, and knows the stress deformation change process of the striker spring in the whole service life.)

1. A high-frequency striker spring fatigue test device is characterized by comprising a control unit (1), a pressure sensor (2), a cam (5), a cooling assembly, a cam driving motor (9), a transmission shaft (10), a heating workbench (12), a rolling shaft (14), a rolling shaft pre-tightening mechanism, a displacement sensor (16), a heating pressure platform (17), an electric cylinder (18) and an electric cylinder driving motor (20);

the output end of the cam driving motor (9) is connected with the transmission shaft (10), the cam (5) is coaxially positioned on the transmission shaft (10), the cam driving motor (9) drives the transmission shaft (10) to rotate, and the transmission shaft (10) drives the cam (5) to coaxially rotate;

the roller (14) is in contact with the cam (5) all the time through a roller pre-tightening mechanism;

one end of the heating workbench (12) is connected with the roller pre-tightening mechanism, and the other end is sleeved with a needle spring (3) to be tested; the electric cylinder driving motor (20) is connected with the control unit (1), the control unit (1) is sequentially connected with the electric cylinder (18) and the heating pressure platform (17), and the heating pressure platform (17) is not contacted with the striker spring (3) to be tested in a non-working state;

the displacement sensor (16) is used for detecting the stretching variation of the striker spring (3) to be detected;

the pressure sensor (2) is used for detecting the bearing pressure of the striker spring (3) to be detected;

the cooling component is used for friction cooling between the cam (5) and the roller (14) during working.

2. A high-frequency striker spring fatigue test device according to claim 1, wherein said roller preloading means comprises a link mechanism (4) and a link damper spring (19); one end of the connecting rod mechanism (4) is a rod piece, the other end of the connecting rod mechanism is concave, the rolling shaft (14) is positioned in the concave and is hinged with the concave end through a connecting rod, a connecting rod buffer spring (19) is sleeved on the rod body at the other end of the connecting rod mechanism, and the connecting rod buffer spring (19) is fixedly connected with the heating workbench (12).

3. A high-frequency striker spring fatigue test device according to claim 1 or 2, further comprising an upper case (15) and a lower case (13), wherein the end of the transmission shaft (10) not connected to the cam driving motor (9) passes through the lower case (15) and is hinged to the side wall of the lower case (15); the cam (5) and the roller (14) are positioned in the lower box body (13), and the connecting rod buffer spring (19), the heating workbench (12), the striker spring to be tested (3), the heating pressure platform (17), the pressure sensor (2), the displacement sensor (16) and the electric cylinder (18) are positioned in the upper box body (15).

4. A high frequency striker spring fatigue test device according to claim 3, characterized in that the side wall of said upper case (15) is further provided with a glass observation door (11) for installing the striker spring to be tested and observing the operating conditions of the striker spring under working conditions.

5. The fatigue testing device for the high-frequency striker spring according to claim 1, wherein the cooling assembly comprises an oil pipe (6) and an oil pump (7), one end of the oil pipe (6) passes through the lower box body (13), the pipe orifice is opposite to the joint of the cam (5) and the roller (14), and the other end is connected with the oil pump (7), so that the cooling lubricating oil can be recycled.

6. A high-frequency striker spring fatigue test device according to claim 1, characterized in that said heating table (12) and heating pressure platform (17) are used to heat the striker spring (3) to be tested, simulating the heating behavior of the striker spring after firing practice.

7. A high-frequency striker spring fatigue test device according to claim 1 or 2, characterized in that the axes of said link mechanism (4), link damping spring (19), striker spring to be tested (3) and electric cylinder (18) coincide with each other.

8. A high-frequency striker spring fatigue test device according to claim 1, characterized in that the control system of said control unit (1) is operated and controlled by PLC logic control principle.

9. A high-frequency striker spring fatigue test device according to claim 1, characterized in that said displacement sensor (16) is mounted at the lower end of the control unit (1), the laser spot is irradiated on the heating table (12) when the displacement sensor (16) is operated; the displacement sensor (16) is used for detecting the moving displacement of the heating workbench (12), namely the stretching displacement of the striker spring to be detected.

10. A method for testing a fatigue testing apparatus for a high frequency striker spring according to claim 1, characterized by comprising the steps of:

step 1: installing a striker spring to be tested, and determining relevant parameters of the striker spring to be tested: manually installing one end of a striker spring (3) to be tested into a central hole of a striker spring heating workbench (12); starting the electric cylinder (18) to work, moving the firing pin spring heating pressure platform (17) down to the end part of the other end of the firing pin spring (3) to be tested, and ensuring the firing pin spring to have no prepressingForce, at which time the output of the pressure sensor (2) is 0; recording the output voltage V of the displacement sensor (16) in the initial position in the pressureless state₀(ii) a The original free length of the striker spring to be tested is H₀；

Step 2: calculating the reliable working length range of the striker spring to be tested under the actual working condition, comprising the following substeps:

step 2.1: the striker spring (3) to be tested is compressed to H at the lowest point of the cam (5)₁Length, based on the output voltage V of the displacement sensor (16) at its original position₀And sensitivity coefficient K, calculating the spring height H of the striker to be measured₀Shorten H₁Voltage value V of time₁；V₁＝V₀+(H₀-H₁)/K；

Starting the electric cylinder (18) to work, the electric cylinder (18) drives the striker spring to heat the pressure platform (17) to move downwards, and the output voltage is V when the displacement is waited₁Stopping the electric cylinder (18) from working, and recording the firing pin spring prepressing value by the pressure sensor (2) at the moment, namely the firing pin spring prepressing value P1;

step 2.2: the striker spring (3) to be tested is compressed to H at the highest point of the cam₂Length, also dependent on the output voltage V at the home position of the displacement sensor (16)₀And sensitivity coefficient K, calculating the spring height H of the striker to be measured₀Shorten H₂Voltage value V of time₂；V₂＝V₀+(H₀-H₂)/K；

Starting the electric cylinder (18) to work, the electric cylinder (18) drives the striker spring to heat the pressure platform (17) to move downwards, and the output voltage is V when the displacement is waited₂The electric cylinder (18) stops working, and the pressure sensor records the pre-pressure value of the striker spring, namely the working pressure value P of the striker spring₂A value;

step 2.3: the reliable working length range of the striker spring to be tested under the actual working condition is H₁-H₂；

And step 3: the method comprises the following steps of running a test and determining a pre-pressure value and frequency, wherein the method comprises the following substeps:

step 3.1: setting the rotating speed n and the running time t of a cam driving motor on a control unit (1) according to the actual required frequency f of a firing spring and the actual required frequency of firing; the running time t is the shooting number/the frequency f actually needed by the striker spring;

opening the oil well pump (7) and starting a lubricating and cooling cycle;

recording the pre-pressure P after running for one period at the frequency f and the running time t₁₁Value, frequency f₁₁；

Step 3.2: starting a firing pin spring heating workbench (12) and a firing pin spring heating pressure platform (17) to heat a firing pin spring to a temperature T, wherein the temperature T is the temperature value of the firing pin spring in actual work; the step simulates the working condition in practice, so that the striker spring is naturally cooled,

step 3.3: repeating the steps (1) to (2) for a plurality of times after the temperature is reduced to the normal temperature, and recording the pre-pressure value P₁₂、P₁₃、P₁₄..., frequency f₁₂、f₁₃、f₁₄......；

And 4, step 4: judging the service life of the striker spring to be tested;

observing the expansion change of the striker spring in real time, and observing whether the striker spring has a damaged condition or has an obvious shortening phenomenon and a pre-pressure attenuation change process in the test process;

turning off the motor, taking out the striker spring (3) to be tested after the equipment is stopped, observing whether the appearance has a fracture phenomenon, and if the appearance has the fracture phenomenon, indicating that the service life of the striker spring is up;

if there is no fracture, the free length of the striker spring is tested, together with the original free length H₀And (3) comparison: according to the requirement of the work specification of the striker spring, when the striker spring is shortened by 20 percent, the striker spring is considered to be invalid; if not, repeating the step 3, and if 20%, determining that the service life of the striker spring is up.

Recording the frequency f of the full test_All-purpose＝f₁₁+f₁₂+f₁₃+f₁₄+..; the service life of the striker spring to be tested is f_All-purpose。

Technical Field

The invention belongs to the field of testing, and particularly relates to a high-frequency striker spring fatigue testing device and a testing method.

Background

The firing spring is one of the core components of the firing device of the weapon system, which is used for examining the firing condition in the whole life test process of the weapon system and judging that the fatigue life of the firing spring is reached after firing a plurality of ammunitions, in the past, the fatigue life method of the firing spring is mostly combined with a practice simulation method to roughly estimate a quantity value through theoretical calculation, the fatigue life of the firing spring is obtained through a stress calculation formula by theoretically calculating the maximum stress and the minimum stress of the firing spring, because the high-frequency operation and the firing condition of the weapon system are severe, the actual working life of the firing spring with the service life of tens of thousands of times is theoretically calculated to be less than 1 ten thousand times, and the practice simulation measures the deformation of the firing spring after firing a certain number of actual ammunition and judges according to the firing condition, if the unfired rate is obviously increased, the service life of the firing spring is considered to be reached. The technical ammunition loss amount is large due to the largest defect of live firing, because a full-life test needs to be carried out to judge the fatigue life of a firing pin spring, more than ten thousand ammunitions are used for the test, and the cost of only the ammunition is more than ten million. And the randomness of the firing practice test is high, and the characteristics of the whole firing pin spring working fatigue life process are not known.

At present, the fatigue test device for the impact spring is more and is influenced by the limited work of a transmission mechanism, high frequency, easy abrasion and the like, and the fatigue test device is more a low-frequency device and has short service life.

Disclosure of Invention

The technical problem solved by the invention is as follows: the invention provides a high-frequency striker spring fatigue test device and a test method, aiming at solving the problems of larger labor, material resources and financial resources caused by measuring the service life of the striker spring through practice simulation and larger error in theoretical calculation. The device adopts a pressure sensor and a displacement sensor, collects the stress and deformation parameters of the striker spring in real time, and knows the stress deformation change process of the striker spring in the whole service life.

The technical scheme of the invention is as follows: a high-frequency striker spring fatigue test device comprises a control unit 1, a pressure sensor 2, a cam 5, a cooling assembly, a cam driving motor 9, a transmission shaft 10, a heating workbench 12, a rolling shaft 14, a rolling shaft pre-tightening mechanism, a displacement sensor 16, a heating pressure platform 17, an electric cylinder 18 and an electric cylinder driving motor 20;

the output end of the cam driving motor 9 is connected with the transmission shaft 10, the cam 5 is coaxially positioned on the transmission shaft 10, the cam driving motor 9 drives the transmission shaft 10 to rotate, and the transmission shaft 10 drives the cam 5 to coaxially rotate;

the roller 14 enables the roller 14 to be always in contact with the cam 5 through a roller pre-tightening mechanism;

one end of the heating workbench 12 is connected with the roller pre-tightening mechanism, and the other end is sleeved with a striker spring 3 to be tested; the electric cylinder driving motor 20 is connected with the control unit 1, the control unit 1 is sequentially connected with the electric cylinder 18 and the heating pressure platform 17, and the heating pressure platform 17 is not contacted with the striker spring 3 to be tested in a non-working state;

the displacement sensor 16 is used for detecting the expansion variation of the striker spring 3 to be detected;

the pressure sensor 2 is used for detecting the pressure borne by the striker spring 3 to be detected;

the cooling component is used for friction cooling between the cam 5 and the roller 14 during work.

The further technical scheme of the invention is as follows: the roller pre-tightening mechanism comprises a connecting rod mechanism 4 and a connecting rod buffer spring 19; one end of the connecting rod mechanism 4 is a rod piece, the other end of the connecting rod mechanism is concave, the rolling shaft 14 is positioned in the concave and is hinged with the concave end through a connecting rod, a connecting rod buffer spring 19 is sleeved on the rod body at the other end, and the connecting rod buffer spring 19 is fixedly connected with the heating workbench 12.

The further technical scheme of the invention is as follows: the device also comprises an upper box body 15 and a lower box body 13, wherein one end of the transmission shaft 10, which is not connected with the cam driving motor 9, penetrates through the lower box body 15 and is hinged with the side wall of the lower box body 15; the cam 5 and the roller 14 are positioned in the lower box body 13, and the connecting rod buffer spring 19, the heating workbench 12, the striker spring 3 to be tested, the heating pressure platform 17, the pressure sensor 2, the displacement sensor 16 and the electric cylinder 18 are positioned in the upper box body 15.

The further technical scheme of the invention is as follows: and the side wall of the upper box body 15 is also provided with a glass observation door 11 for installing a tested firing pin spring and observing the working condition of the firing pin spring under the working condition.

The further technical scheme of the invention is as follows: the cooling assembly comprises an oil pipe 6 and an oil well pump 7, one end of the oil pipe 6 penetrates through the joint of the lower box body 13 and the pipe orifice, which is just opposite to the cam 5 and the roller 14, and the other end of the oil pipe is connected with the oil well pump 7, so that the cooling lubricating oil is ensured to be recycled.

The further technical scheme of the invention is as follows: the heating workbench 12 and the heating pressure platform 17 are used for heating the firing pin spring 3 to be tested and simulating the firing pin spring heating working condition after firing practice.

The further technical scheme of the invention is as follows: the axes of the connecting rod mechanism 4, the connecting rod buffer spring 19, the striker spring 3 to be tested and the electric cylinder 18 are superposed.

The further technical scheme of the invention is as follows: and the control system of the control unit 1 adopts a PLC logic control principle to carry out operation control.

The further technical scheme of the invention is as follows: the displacement sensor 16 is arranged at the lower end of the control unit 1, and a laser point needs to irradiate on the heating workbench 12 when the displacement sensor 16 works; the displacement sensor 16 is used for detecting the moving displacement of the heating workbench 12, namely the stretching displacement of the striker spring to be detected.

The further technical scheme of the invention is as follows: a method of testing the high frequency striker spring fatigue test apparatus of claim 1, comprising the steps of:

step 1: installing the striker spring to be tested, determining the parameters related to the striker spring to be testedNumber: manually installing one end of a striker spring 3 to be tested into a central hole of a striker spring heating workbench 12; starting the electric cylinder 18 to work, moving the striker spring heating pressure platform 17 downwards to the end part of the other end of the striker spring 3 to be tested to ensure that the striker spring has no prepressing force, and outputting 0 by the pressure sensor 2 at the moment; recording the output voltage V of the displacement sensor 16 in the home position in the pressureless state₀(ii) a The original free length of the striker spring to be tested is H₀；

Step 2: calculating the reliable working length range of the striker spring to be tested under the actual working condition, comprising the following substeps:

step 2.1: compressing the striker spring 3 to be tested to H at the lowest point of the cam 5₁Length, according to the output voltage V of the displacement sensor 16 at its original position₀And sensitivity coefficient K, calculating the spring height H of the striker to be measured₀Shorten H₁Voltage value V of time₁；V₁＝V₀+H₀-H₁/K；

Starting the electric cylinder 18 to work, the electric cylinder 18 drives the striker spring to heat the pressure platform 17 to move downwards, and the output voltage is V when the displacement is up to₁Stopping the electric cylinder 18, and recording the firing pin spring prepressing value by the pressure sensor 2, namely the firing pin spring prepressing value P1;

step 2.2: the striker spring 3 to be tested is compressed to H at the highest point of the cam₂Length, again dependent on the output voltage V at the home position of the displacement sensor 16₀And sensitivity coefficient K, calculating the spring height H of the striker to be measured₀Shorten H₂Voltage value V of time₂；V₂＝V₀+H₀-H₂/K；

Starting the electric cylinder 18 to work, the electric cylinder 18 drives the striker spring to heat the pressure platform 17 to move downwards, and the output voltage is V when the displacement is up to₂The electric cylinder 18 is stopped, and the pressure sensor records the hammer spring pre-pressure value, namely the hammer spring working pressure value P₂A value;

step 2.3: the reliable working length range of the striker spring to be tested under the actual working condition is H₁-H₂；

And step 3: the method comprises the following steps of running a test and determining a pre-pressure value and frequency, wherein the method comprises the following substeps:

step 3.1: setting the rotating speed n and the running time t of a cam driving motor on a control unit 1 according to the actual required frequency f of a firing spring and the requirement of the actual required firing frequency; the running time t is the shooting number/the frequency f actually needed by the striker spring;

opening the oil well pump 7 and starting a lubricating and cooling cycle;

recording the pre-pressure P after running for one period at the frequency f and the running time t₁₁Value, frequency f₁₁；

Step 3.2: starting a striker spring heating workbench 12 and a striker spring heating pressure platform 17 to heat the striker spring to a temperature T, wherein the temperature T is the temperature value of the striker spring in actual work; the step simulates the working condition in practice, so that the striker spring is naturally cooled,

step 3.3: repeating the steps 1-2 for a plurality of times after the temperature is reduced to the normal temperature, and recording the pre-pressure value P₁₂、P₁₃、P₁₄..., frequency f₁₂、f₁₃、f₁₄......；

And 4, step 4: judging the service life of the striker spring to be tested;

observing the expansion change of the striker spring in real time, and observing whether the striker spring has a damaged condition or has an obvious shortening phenomenon and a pre-pressure attenuation change process in the test process;

turning off the motor, taking out the striker spring 3 to be tested after the equipment is stopped, observing whether the appearance has a fracture phenomenon, and if the appearance has the fracture phenomenon, indicating that the service life of the striker spring is up;

if there is no fracture, the free length of the striker spring is tested, together with the original free length H₀And (3) comparison: according to the requirement of the work specification of the striker spring, when the striker spring is shortened by 20 percent, the striker spring is considered to be invalid; if not, repeating the step 3, and if 20%, determining that the service life of the striker spring is up.

Recording the frequency f of the full test_All-purpose＝f₁₁+f₁₂+f₁₃+f₁₄+..; the service life of the striker spring to be tested is f_All-purpose。

Effects of the invention

The invention has the technical effects that: compared with the prior art, the invention has the following advantages:

1. the fatigue test of the firing pin spring is simulated by the fatigue test device, the conventional judgment through firing practice experience data is replaced, and the manpower, material resources, time and high ammunition cost are saved;

2. the real test shows that the firing pin spring prepressing P1, the working pressure P2 and the deformation value of the firing pin spring in the life are provided for the weapon system;

3. the test operation is simple, the installation is convenient, the test and the examination of the whole service life of the striker spring can be completed in a few minutes, and the examination efficiency is improved by thousands of times compared with the practical projectile examination efficiency;

4. the device for testing the fatigue of the striker spring can also be suitable for testing the fatigue life of other springs.

Drawings

FIG. 1 is a schematic structural diagram of a fatigue testing device for a high-frequency striker spring;

FIG. 2 is a schematic view of the cam of FIG. 1;

in the figure, 1-control unit, 2-pressure sensor, 3-striker spring to be tested, 4-link mechanism, 5-cam, 6-oil pipe, 7-oil pump, 8-base, 9-cam driving motor, 10-transmission shaft, 11-glass observation door, 12-striker spring heating workbench, 13-lower box, 14-roller, 15-upper box, 16-displacement sensor, 17-striker spring heating pressure platform, 18-electric cylinder, 19-link buffer spring and 20-electric cylinder driving motor.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Referring to fig. 1-2, the fatigue testing device for a high-frequency striker spring of the present invention comprises a control unit 1, a pressure sensor 2, a link mechanism 4, a cam 5, an oil pipe 6, an oil pump 7, a base 8, a cam driving motor 9, a transmission shaft 10, a heating table 12, a lower case 13, a roller 14, an upper case 15, a displacement sensor 16, a heating pressure platform 17, an electric cylinder 18, a link buffer spring 19, and an electric cylinder driving motor 20; the base 8 is a mounting and bearing base body of the whole testing device; the cam driving motor 9 is connected with one end of the transmission shaft 10, and the cam driving motor 9 provides power for the transmission shaft 10; the other end of the transmission shaft 10 penetrates through the box body and is connected with the side wall of the box body; the cam 5 is connected to the transmission shaft 10 and is positioned in the box body, and the cam 5 can rotate around a shaft at a high speed; one end of the connecting rod mechanism 4 is provided with a roller 14, and the roller 14 is matched with the rolling surface of the cam 5; the other end of the link mechanism 4 is provided with a link buffer spring 19 to ensure that the roller 14 is always in contact with the cam 5. And a firing pin spring heating workbench 12 is arranged on the end face of the other end of the connecting rod mechanism 4, the firing pin spring heating workbench 12 is used for fixing a firing pin spring 3 to be tested, heating the firing pin spring 3 and simulating the heating working condition of the firing pin spring after firing practice.

The control unit 1 is respectively connected with the cam driving motor 9, the electric cylinder driving motor 20 and the oil well pump 7, and a control system of the control unit 1 adopts a PLC (programmable logic controller) logic control principle to carry out operation control for controlling the whole fatigue testing process. The lower part of the control unit 1 is provided with an electric cylinder 18, the electric cylinder 18 is used for stretching and contracting to apply pre-pressure to the striker spring 3 to be tested, the end of the electric cylinder 18 is provided with a striker spring heating pressure platform 17, the striker spring heating pressure platform 17 is used for fixing the other end of the striker spring 3 to be tested and heating the striker spring at the same time, and the striker spring heating pressure platform 17 and the striker spring heating workbench 12 are used for heating the striker spring at the same time and simulating the heating working condition of the striker spring after live ammunition shooting. The pressure sensor 2 is arranged on the electric cylinder 18 and close to the position of the striker spring heating pressure platform 17 and is used for detecting the stretching pressure of the striker spring in real time; the lower end of the control unit 1 is provided with a displacement sensor 16, the mounting position ensures that a laser point irradiates on the heating platform 12 when the displacement sensor works, and the heating platform 12 moves, namely, the spring stretches and retracts.

The box body comprises a lower box body 13 and an upper box body 15; one end of the transmission shaft 10, the cam 5 and the link mechanism 4 are arranged in the sealed lower box body 13, so that the safety of the cam 5 and the roller 14 under high-speed rotation is guaranteed; the firing pin spring heating workbench 12 and the upper end of the connecting rod mechanism 4, the pressure sensor 2, the displacement sensor 16 and the firing pin spring heating pressure platform 17 are arranged in the upper box body 15, the upper box body 15 ensures the motion safety of the firing pin spring to be detected under the high-temperature condition, and the firing pin spring is prevented from being ejected out to cause injury to workers. The side wall of the upper box body 15 is provided with a glass observation door 11, and a tested striker spring can be installed after the glass observation door 11 is opened, and meanwhile, the working condition of the striker spring under the working condition can be observed. The striker spring heating worktable 12 is of a convex structure, a central hole is processed on the rod body along the axis, one end of the striker spring 3 to be tested is embedded in the central hole of the rod body to play a role of fixing a sensor,

the oil pipe 6 passes through the lower box body 13 and the joint of the pipe orifice right opposite to the cam 5 and the connecting rod structure 4; in the high-speed rotation process of the cam 5, the cooling and lubricating functions are realized on the cam 5 and the connecting rod mechanism 4, so that the phenomena of easy abrasion, short service life and heating of the high-frequency operation transmission mechanism are greatly reduced; the oil pipe 6 is connected with the oil well pump 7, and the cooling lubricating oil can be recycled.

Under the driving action of the cam driving motor 9, the transmission shaft 10 rotates to further drive the cam 5 to rotate, and the rolling shaft 14 is contacted with the convex end face of the cam 5 to realize the stretching and compressing functions of the high-frequency striker spring to be tested; the maximum expansion frequency is 10000 times/min.

In order to accurately test the pressure change of the striker spring under the high-frequency operation condition, the pressure sensor 2 adopts a 208C02 type force sensor of the American PCB company, the pulling pressure is 445N, the sensitivity is 11.24mv/N, the resolution is 0.004N, and the upper limit frequency is 36 KHz. The displacement sensor 16 is a model ZX2-LD50 of Ohlong corporation of Japan, the measuring range is 50mm +/-10 mm, and the resolution is 1.5 um.

Cam driving motor 9, oil-well pump 7 and lower box 13 are fixed on base 8, and base 8 below is provided with the lower margin, satisfies the demand that removes.

The method for testing by adopting the high-frequency striker spring fatigue testing device comprises the following steps:

step 1: installing a striker spring to be tested, and determining relevant parameters of the striker spring to be tested;

opening the glass observation door 11, and manually installing one end of the striker spring 3 to be tested into a central hole of the striker spring heating workbench 12; starting the electric cylinder 18 to work, moving the striker spring heating pressure platform 17 downwards to the end part of the other end of the striker spring 3 to be tested to ensure that the striker spring has no prepressing force, and outputting 0 by the pressure sensor 2 at the moment; recording the output voltage V0 of the displacement sensor 16 at the original position in the no-pressure state;

the original free length of the striker spring to be tested is H0.

Step 2: calculating the reliable working length range of the striker spring to be tested under the actual working condition;

1, compressing a striker spring 3 to be tested to H1 length at the lowest point of a cam 5, and calculating a voltage value V1 when the striker spring to be tested is shortened from H0 to H1 according to an output voltage V0 and a sensitivity coefficient K when a displacement sensor 16 is at an original position; v1 ═ V0+ H0-H1/K;

starting the electric cylinder 18 to work, wherein the electric cylinder 18 drives the striker spring heating pressure platform 17 to move downwards, the electric cylinder 18 stops working when the displacement output voltage is V1, and the pressure sensor 2 records the striker spring pre-pressure value which is the striker spring pre-pressure value P1;

2, compressing the striker spring 3 to be tested to H2 length at the highest point of the cam, and calculating the voltage value V2 when the striker spring to be tested is shortened from H0 to H2 according to the output voltage V0 and the sensitivity coefficient K when the displacement sensor 16 is at the original position; v2 ═

V0+H0-H2/K；

And starting the electric cylinder 18 to work, wherein the electric cylinder 18 drives the striker spring heating pressure platform 17 to move downwards, the electric cylinder 18 stops working when the displacement output voltage is V2, and the pressure sensor records the striker spring pre-pressure value which is the striker spring working pressure value P2.

3H1 is the length of the striker spring to be tested under the condition of pre-compression under the actual working condition, and H1-H2 is the reliable working length range of the striker spring under the actual working condition.

And step 3: running a test, and determining pre-pressure values P12, P13 and P14.. ang, frequency f12, f13 and f14.. ang;

1, setting the rotating speed n and the running time t of a cam driving motor on a control unit 1 according to the requirements that the actual fighting frequency ff of a striker spring is more than or equal to 10000 shots/min and the actual fighting shooting frequency of a weapon system; the running time t is the shooting number/actual fighting frequency f of the striker spring; such as: the fighting frequency of a certain firing pin spring is 10000 shots/min, the number of required firing bullets is 500 shots, and the running time t is 5 s;

opening the oil well pump 7 and starting a lubricating and cooling cycle;

when the device runs for one period at the frequency f and the running time t, recording the value of pre-pressure P11 and the frequency f 11; for example: when the device runs for one period with the frequency f being 1000 times/min and the running time t being 3s, recording the value of pre-pressure P11 and the frequency f 11; detecting that P11 is 201N, f11 is 500;

2, starting a firing pin spring heating workbench 12 and a firing pin spring heating pressure platform 17 to heat the firing pin spring to a temperature T, wherein the temperature T is the temperature value of the firing pin spring after the actual operation of the weapon system; if the temperature T is 176 ℃ after the 500-emitting radio frequency is 10000 emitting/min, simulating the actual operation working condition, and naturally cooling the striker spring after the temperature is rapidly increased to T;

3, repeating the step 1-2 for a plurality of times after the temperature T is reduced to the normal temperature, and recording pre-pressure values P12, P13 and P14.. 9 and frequency f12, f13 and f14.. 9;

for example, under the working conditions that the fighting frequency is 8000 rounds/min, the fighting time is 1.2s and the heating temperature T is 176 ℃, the P12 is 198N, and the f12 is 160; under the working conditions that the operation frequency is 6000 rounds/min, the operation time is 6s and the heating temperature T is 55 ℃, P13 is 170N, f13 is 600; under the working conditions that the fighting frequency is 10000 rounds/min, the fighting time is 6s and the heating temperature T is 80 ℃, P14 is 160N, and f14 is 1000;

and 4, step 4: judging the service life of the striker spring to be tested;

the telescopic change of the striker spring is observed in real time through the glass observation window 11, and whether the striker spring is damaged or is obviously shortened or not and the pre-pressure attenuation change process are observed in the test process;

turning off the motor, taking out the striker spring 3 to be tested after the equipment is stopped, observing whether the appearance has a fracture phenomenon, and if the appearance has the fracture phenomenon, indicating that the service life of the striker spring is up;

if there is no fracture, the striker spring free length is tested and compared to the original free length H0: according to the requirement of the work specification of the striker spring, when the striker spring is shortened by 20 percent, the striker spring is considered to be invalid; if not, repeating the step 4, and if 20%, determining that the service life of the striker spring is up to.

Recording the full test frequency fmotai-f 11+ f12+ f13+ f14 +; the service life of the striker spring to be tested is f full.

For example, in step 3, if the striker spring is found to have shortened by 20% after the fatigue test is performed 4 times, the life of the striker spring is 2260 times if the striker spring has reached the end of its life f, which is f11+ f12+ f13+ f 14-500 +160+600+ 1000-2260 times.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.