Method for testing acupuncture sensitivity of propellant package

Abstract

The invention discloses a method for testing acupuncture sensitivity of a propellant package. According to the test method, a drop hammer impact tester is selected as a research platform, a special mold is used for testing, the movement speed and strength of a needle are adjusted by adjusting the height and the mass of a drop hammer, and the acupuncture sensitivity and the safety characteristic rule of accidents in the medicine bag sewing process are obtained. The method is high in accuracy and low in cost, and can be finally used for acupuncture sensitivity testing when accidents occur in the medicine bag sewing process.

Description

Technical Field

[0001] This invention relates to the field of propellant needle prick sensitivity testing technology, and more specifically, to a method for testing the needle prick sensitivity of propellant packs. Background Technology

[0002] As the core energetic material of weapon systems, propellant's safety and reliability directly determine the weapon system's combat effectiveness, storage safety, and operational safety. Propellant packs, as an integrated carrier of propellant, are widely used in artillery, rocket artillery, and other barrel-mounted weapons. Their manufacturing process involves multiple steps, including raw material proportioning, mixing, pressing, coating, cutting, and assembly. Fluctuations in process parameters, operational deviations, or environmental interference at each step can lead to defects such as uneven composition, abnormal density, microcracks, and impurity contamination within the propellant pack.

[0003] Needle penetration sensitivity is one of the key safety performance indicators of energetic materials. It characterizes the ease with which an energetic material will burn, explode, or react violently when punctured by a sharp object. It directly reflects the ability of a propellant charge to withstand needle penetration impact during production, transportation, assembly, use, and accident conditions. Compared to single propellant agents, integrated propellant charges are more significantly affected by process factors due to their structural complexity, multi-component composition (including propellant, coating layer, binder, etc.), and the cumulative effect of manufacturing processes. For example, uneven mixing may lead to the accumulation of high-energy components in certain areas, making it easier to induce local combustion and explosion upon needle penetration; excessive pressing pressure may cause stress concentration inside the propellant charge, and stress release during needle penetration may induce an overall reaction; damage to the coating layer may directly expose the propellant, reducing the needle penetration initiation threshold.

[0004] Currently, the energetic materials industry is continuously raising its safety requirements for propellant packages. Standards such as the "Safety Specifications for Military Propellants" and the "Sensitivity Testing Methods for Energetic Materials" clearly require safety performance control throughout the entire package manufacturing process. However, in practice, existing needle penetration sensitivity tests are mostly focused on the final inspection of finished packages, with insufficient dynamic testing and risk tracing for key processes during manufacturing. This results in some needle penetration sensitivity abnormalities caused by process defects not being identified in the early stages, thereby increasing the safety hazards of finished packages.

[0005] Furthermore, in recent years, there have been frequent production safety accidents and storage failures in the field of energetic materials both domestically and internationally due to substandard needle penetration sensitivity of propellant packages, highlighting the importance of precise control over needle penetration sensitivity during the package manufacturing process. Therefore, conducting research on needle penetration sensitivity testing during propellant package manufacturing, focusing on the correlation between process steps and needle penetration sensitivity, and establishing a dynamic testing system and risk identification mechanism have become urgent tasks to address current shortcomings in propellant package safety management and meet the development needs of weaponry. Summary of the Invention

[0006] This invention provides a method for testing the needle puncture sensitivity of propellant packs. This method offers high accuracy by adjusting the drop weight height and mass to regulate the needle's movement speed and force, thereby obtaining the needle puncture sensitivity in case of unexpected situations during the pack sewing process.

[0007] This invention provides a method for testing the needle penetration sensitivity of propellant packs, wherein the needle penetration sensitivity testing platform is a drop hammer impact tester, which is the same as that used for impact sensitivity.

[0008] The invention provides a method for testing the needle prick sensitivity of propellant packs.

[0009] The testing method includes:

[0010] Step 1: Turn on the power of the impact sensitivity meter, select a drop hammer of appropriate mass, and use the fixing device to fix the drop hammer on the guide rail;

[0011] Step 2: When using a loading mold for testing, select a mold to install on the positioning column, and then directly insert the loading device;

[0012] Step 3: Preliminary test begins. Press the solenoid valve switch to release the drop hammer. Adjust the sharpness of the needle in the propellant mold according to whether the propellant ignites and the sensitivity to the drop hammer test.

[0013] Step 4: After the preliminary test, select an appropriate starting test point according to different propellants, and record the test results.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) Improve test accuracy and data repeatability to ensure evaluation accuracy: The characteristic drop height method can achieve quantitative control of the needle impact force by precisely controlling the drop hammer mass and drop height parameters. Combined with the rigid constraints of the needle angle and needle depth by the special mold, it can effectively avoid interference factors such as impact force fluctuation and needle posture deviation caused by manual operation.

[0016] (2) Enhance the safety of the testing process and avoid testing risks: The special mold integrates sample limiting, energy buffering and explosion protection structure, which can effectively constrain the combustion and explosion reaction range of the sample during the needle penetration test, and avoid safety accidents caused by sample splashing and fragment diffusion.

[0017] (3) The special mold preparation process is simple and the equipment cost is low. Attached Figure Description

[0018] Figure 1 The image shows a physical drawing and schematic diagram of a needle-punch sensitivity loading mold. A: striking post; B: needle; C: sleeve; D: base. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the scope of protection of the present invention to the scope of the embodiments. Any non-inventive substitutions or changes based on the embodiments of the present invention should be covered within the scope of protection of the present invention.

[0020] This invention provides a method for testing the needle prick sensitivity of propellant packs. The mold includes a striking post, a needle, a sleeve, and a base. Compared with the original mold, this mold adds a needle component for testing needle prick sensitivity. The sleeve is divided into two parts connected by two metal pillars for easy disassembly. The base has multiple small holes to enhance venting capacity.

[0021] Furthermore, the drop hammer models are available in four weights: 1kg, 2kg, 5kg, and 10kg, and the needle sharpness is available in three angles: 60°, 70°, and 80°.

[0022] Furthermore, when the drop height is less than 20cm and the sample ignites, a sharper needle should be used for testing.

[0023] Furthermore, when the drop height is higher than 80cm and the sample ignites, a blunter needle should be used for testing.

[0024] Furthermore, when the drop height is between 20 and 80 cm and the sample ignites, the current needle should be used for testing.

[0025] Furthermore, when the sample does not ignite, a blunter needle should be used for testing.

[0026] Furthermore, the mold includes a striking post, a needle, a sleeve, and a base.

[0027] Furthermore, compared to the original mold, this mold has added a needle component, which is excellent for testing the needle sensitivity of the propellant; the needle is 2.68cm long and 1.62cm in diameter.

[0028] Furthermore, the sleeve of the mold is divided into two parts, connected by two metal pillars in the middle, which facilitates disassembly and simplifies the operation process. The sleeve has a diameter of 4.50cm, the first part is 2.52cm long, and the second part is 1.50cm long.

[0029] Furthermore, the base of the mold has been fitted with multiple small holes to enhance the device's venting capacity and improve the safety of the testing process. The base is 4.50 cm in diameter, 1.60 cm long, and the small holes are 1.80 mm in diameter.

[0030] Example 1

[0031] Step 1: Turn on the power of the impact sensitivity meter, select a suitable weight for the drop hammer, and use the fixing device to fix the drop hammer on the guide rail;

[0032] Step 2: When using a specially designed charge mold for testing, select a mold and install it on the positioning column. Then, directly install the charge device according to the GJB test procedure.

[0033] Step 3: Preliminary test begins. Press the solenoid valve switch to release the drop hammer.

[0034] Step 4: After the preliminary test, select a 60° needle, a 2kg drop weight, a test temperature of 20℃, and a humidity of 50%. Select a suitable starting test point for the single base drug 1 and record the test results.

[0035] Example 2

[0036] Step 1: Turn on the power of the impact sensitivity meter, select a suitable weight for the drop hammer, and use the fixing device to fix the drop hammer on the guide rail;

[0037] Step 2: When using a specially designed charge mold for testing, select a mold and install it on the positioning column. Then, directly install the charge device according to the GJB test procedure.

[0038] Step 3: Preliminary test begins. Press the solenoid valve switch to release the drop hammer.

[0039] Step 4: After the preliminary test, select an 80° needle, a 5kg drop weight, a test temperature of 20℃, and a humidity of 50%. Select a suitable starting test point for the single base drug 2 and record the test results.

[0040] Example 3

[0041] Step 1: Turn on the power of the impact sensitivity meter, select a suitable weight for the drop hammer, and use the fixing device to fix the drop hammer on the guide rail;

[0042] Step 2: When using a specially designed charge mold for testing, select a mold and install it on the positioning column. Then, directly install the charge device according to the GJB test procedure.

[0043] Step 3: Preliminary test begins. Press the solenoid valve switch to release the drop hammer.

[0044] Step 4: After the preliminary test, select a 60° needle, a 5kg drop weight, a test temperature of 20℃, and a humidity of 50%. Select a suitable starting test point for the double-base drug 1 and record the test results.

[0045] The needle puncture sensitivity response thresholds of the samples in Examples 1-3 were 14.23 J, 43.29 J, and 45.66 J, respectively.

[0046] As described above, the needle penetration sensitivity testing method obtained according to this invention can be used as a research platform, employing a specially designed mold for testing. By adjusting the height and mass of the falling hammer, the movement speed and force of the needle can be regulated, thereby obtaining the needle penetration sensitivity and safety characteristics under unexpected situations during the sewing of medicine pouches. This method is highly accurate and low-cost, and can ultimately be used for needle penetration sensitivity testing under unexpected situations during the sewing of medicine pouches.

Claims

1. A method for testing the needle sensitivity of a propellant charge, characterized in that The test method comprises: Step 1: turn on the power of the impact sensitivity tester, select the appropriate mass of the drop hammer, and use the fixing device to fix the drop hammer on the guide rail; Step 2: when the charging mold test is used, the mold is selected to be installed on the positioning column, and the charging device can be directly loaded; Step 3: start the pre-test, press the electromagnetic valve switch, release the drop hammer; according to whether the propellant is ignited and the sensitivity of the drop hammer test, adjust the sharpness of the needle in the charging mold; Step 4: after the pre-test, select the appropriate starting test point for testing according to different propellants, and record the test results.

2. A method of testing for sensitivity to needle pricking of a propellant charge according to claim 1, characterized in that: The drop hammer has four types of 1kg, 2kg, 5kg and 10kg, and the needle tip sharpness has three types of 60°, 70° and 80°.

3. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 1, characterized in that: When the drop hammer height is lower than 20cm and the sample ignites, a relatively sharp needle is selected for testing.

4. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 1, characterized in that: When the drop hammer height is higher than 80cm and the sample ignites, a relatively blunt needle is selected for testing.

5. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 1, characterized in that: When the drop hammer height is between 20cm and 80cm and the sample ignites, the current needle is selected for testing.

6. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 1, characterized in that: When the sample does not ignite, a relatively blunt needle is selected for testing.

7. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 1, characterized in that: The mold comprises a striking column, a needle, a sleeve and a base.

8. A method of testing for sensitivity to needle pricking of a propellant charge according to claim 7, characterized in that: Compared with the original mold, the mold adds a needle component, which can well test the needle sensitivity of the propellant; wherein the needle is 2.68cm long and 1.62cm in diameter.

9. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 7, characterized in that: The sleeve of the mold is divided into two parts, connected by two metal supports in the middle, convenient to disassemble, and simplifies the operation process, wherein the sleeve is 4.50cm in diameter, the first part is 2.52cm long, and the second part is 1.50cm long.

10. The method for testing the sensitivity to needle piercing of a propellant charge according to claim 7, characterized in that: The base of the mold adds multiple small holes, enhances the exhaust capacity of the device, and improves the safety of the test process, wherein the base is 4.50cm in diameter and 1.60cm in length, and the small hole is 1.80mm in diameter.

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