Target line method burning rate test sample burning support

Abstract

The utility model belongs to the technical field of propellant performance test, and discloses a target line method burning rate test sample burning support which comprises four metal rods (1) with different lengths, a crucible (2), a metal base (4) with a fillet, a hollow metal cover support with a clamping groove, four electric wires (7), a hollow grip (8) and a four-core aviation plug (9). The four metal rods are uniformly and vertically arranged above the metal base; the crucible is fixed above the metal base and is positioned in the middle of the four metal rods; the four electric wires are in one-to-one correspondence with the four metal rods; one end of the wire is connected with the corresponding metal rod, and the other end passes through the hollow metal handle and is connected with the corresponding jack of the four-core aviation plug. According to the technical scheme, the electric wire is collected in the hollow metal grip, so that a worker is prevented from touching the electric wire when installing the combustion support, and the experiment safety is ensured while the worker conveniently installs the combustion support.

Description

Technical Field

[0001] The utility model belongs to the technical field of propellant performance testing, and in particular relates to a target line method burning rate testing sample combustion bracket. Background Art

[0002] Common and well-established methods for solid propellant burning rate testing include the target line method and underwater acoustic emission. The target line method burn rate testing process primarily involves sample preparation, coating, drilling, threading, and ignition testing. First, the composite solid propellant billet undergoes shaping and pretreatment to produce the test specimen of the appropriate specifications. The test specimen is then immersed and coated in a specialized coating fluid. After drying and curing, the target distance is measured, drilling, and threading are performed. Finally, burning rate tests are conducted under various test conditions, including pressure index and temperature sensitivity coefficient tests.

[0003] Testing is a crucial step in the aforementioned process. To simulate the environment experienced by solid propellants during launch, varying degrees of pressure are applied to the combustion chamber. Testing the burning rate temperature sensitivity coefficient involves testing under high pressure, both at high and low ambient temperatures. Therefore, developing a sample combustion holder capable of safely, reliably, and conveniently completing burning rate tests in these complex environments is imperative. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is to provide a sample combustion bracket which can complete the burning rate test safely, reliably and conveniently in a complex environment.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a target line method burning rate test sample combustion bracket, which is characterized in that it includes four metal rods of different lengths, a crucible 2, a metal base 4 with rounded corners, a hollow metal cover with a slot, four wires 7, a hollow handle 8 and a four-core aviation plug 9; the four metal rods are evenly and vertically arranged above the metal base; the crucible is fixed above the metal base and is located in the middle of the four metal rods; the four wires correspond to the four metal rods one by one; one end of the wire is connected to the corresponding metal rod, and the other end passes through the hollow metal handle and is connected to the corresponding socket of the four-core aviation plug; the hollow metal cover is tightly matched with the bottom of the metal base; one end of the hollow handle 8 is fixedly connected to the bottom of the metal base through a connecting rod, and the other end is fixedly connected to the four-core aviation plug.

[0008] Furthermore, the four metal rods are respectively a common rod, an ignition rod, a target starting rod and a target stopping rod.

[0009] Furthermore, the interior of the four-core aviation plug is provided with a positioning slot.

[0010] Furthermore, the exterior of the hollow metal cover is provided with four positioning slots.

[0011] (3) Beneficial effects

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The wires are gathered in the hollow metal handle to prevent personnel from touching the wires when installing the combustion bracket, which facilitates installation while ensuring experimental safety.

[0014] 2. It uses a metal base with rounded corners and bakelite. A rubber gasket can be sandwiched between the metal base and the hollow metal cover to ensure airtightness during the experiment.

[0015] 3. The four-core aviation plug is equipped with a positioning slot to prevent the experiment from failing due to incorrect insertion of the power cord.

[0016] 4. The outside of the hollow metal cover is equipped with four positioning slots to ensure that the combustion bracket is stuck inside the combustion chamber under high pressure environment, preventing the combustion bracket from falling off during pressurization and causing accidents.

[0017] 5. The four metal rods are connected to the metal base with internal threads, and the four-core aviation plug is connected to the hollow stainless steel handle with internal threads, which is convenient for maintenance and regular replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall schematic diagram of the combustion bracket of the present utility model;

[0019] Figure 2 A simplified flow chart of the combustion bracket experiment using the present invention;

[0020] Figure 3 Schematic diagram of the hollow metal cover. DETAILED DESCRIPTION

[0021] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1As shown, the target line method burning rate test sample combustion support of this embodiment includes a metal rod 1, a crucible 2, a base 4, an electric wire 7, a hollow handle 8 and an aviation plug 9. The metal rod 1 is connected to the base 4 by a thread through the bakelite 3. The bakelite 3, the base 4 and the hollow metal cover with a rubber pad are used to ensure the airtightness of the device in complex environments. The crucible 2 is threadedly connected to the middle of the four metal rods 1 and above the base 4, and is used to place the bottom end of the tested medicine strip to ensure that the tested medicine strip does not tilt during the test. The base 4 is equipped with rounded corners to match the hollow metal cover with a rubber pad. The connecting rod 6 is used to connect the base 4 and the hollow handle 8. One end of the four electric wires 7 is connected to the four metal rods 1 respectively by bolts 5, and the other end is connected to the four-core plug 9 and is stored in the hollow handle 8. The four-core plug 9 is threadedly connected to the bottom end of the hollow handle 8 and is equipped with a positioning slot inside.

[0023] Reference Figure 2 , which is a simplified flow chart of the combustion bracket experiment of the utility model, and its working process is explained in combination with the simplified flow chart and the structural schematic diagram of the device.

[0024] Before the test, the drug strip to be tested is prepared in advance. Tie the drug strip to the combustion bracket, with one end of the ignition wire, the starting target wire and the stopping target wire tied to one of the metal rods, and the other ends tied to the remaining three corresponding metal rods 1. Fasten the three silk threads with tape and place the bottom of the drug strip into the crucible 2. After matching the combustion bracket and the hollow metal cover with a rubber gasket, put it into the test environment, rotate it 45 degrees to tighten the combustion bracket, turn on the host, connect the four-core aviation plug 9 and the power cord, and the host will give the power cord a weak current that is always present and pass it to the four metal rods 1. The built-in optocoupler is used to determine whether the ignition wire, the starting target wire and the stopping target wire are connected. If all are connected, the ignition, starting target and stopping target indicator lights on the host will all light up, and the combustion bracket will be successfully installed.

[0025] After installing the combustion bracket, pressurize the test environment to meet the test requirements. The bakelite 3, base 4, and the hollow metal cover with rubber pads that fit the base ensure airtightness during the test. After a certain period of holding, the main unit issues an ignition command and briefly flows a high current through the circuit formed by the ignition power line and the common pole power line. This high current ignites the charge, disconnecting the ignition wire and turning off the ignition indicator on the main unit. When the charge reaches the starting line, the high temperature instantly burns the starting line. This is detected by the optical coupler and the timing begins. The starting indicator on the main unit turns off. When the charge reaches the stopping line, the high temperature instantly burns the stopping line. This is detected by the optical coupler and the timing stops. The stopping indicator on the main unit turns off. The burning time and burning rate are displayed on the main unit. If the charge does not ignite during ignition and the ignition indicator turns on, try again. If the starting and stopping indicators do not turn off for a long time after ignition, wait one minute, then vent the pressure, check, and repeat the test.

[0026] After the test is completed, wait until the pressure is emptied and unplug the power cord on the aviation plug 9, remove the combustion bracket, clean and dry it, and prepare for next use.

[0027] The four cores of the four-core plug correspond to the four wires connecting the common pole, ignition pole, target starting pole and target stopping pole respectively. At the same time, there is a positioning slot inside, which is matched with the power cord connector connected to the four-core plug to prevent the corresponding wires from being inserted incorrectly, resulting in experiment failure or accidents.

[0028] The electric wire 7 is fixed on the bolt 5, and the bolt is fastened to the bottom of the metal base 4 by a nut. The current flows through the bolt 5, passes through the metal rod 1, and is then transmitted to the ignition wire, the starting wire and the stopping wire.

[0029] Reference Figure 3 , a schematic diagram of a hollow metal cover provided by an embodiment of the present invention. It shows the specific structure of the hollow metal cover of the present invention.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A target line method burning rate test sample combustion support, characterized in that: The invention comprises four metal rods (1) of different lengths, a crucible (2), a metal base (4) with rounded corners, a hollow metal cover with a slot, four wires (7), a hollow handle (8) and a four-core aviation plug (9); the four metal rods are evenly and vertically arranged above the metal base; the crucible is fixed above the metal base and is located in the middle of the four metal rods; the four wires correspond to the four metal rods one by one; one end of the wire is connected to the corresponding metal rod, and the other end passes through the hollow metal handle and is connected to the corresponding socket of the four-core aviation plug; the hollow metal cover is tightly matched with the bottom of the metal base; one end of the hollow handle (8) is fixedly connected to the bottom of the metal base through a connecting rod, and the other end is fixedly connected to the four-core aviation plug.

2. The target line method burning rate test sample combustion support as claimed in claim 1, characterized in that: The four metal rods are the common rod, the ignition rod, the target starting rod and the target stopping rod.

3. The target line method burning rate test sample combustion support as claimed in claim 1, characterized in that: The interior of the four-core aviation plug is provided with a positioning slot.

4. The target line method burning rate test sample combustion support as claimed in claim 1, characterized in that: The hollow metal cover is equipped with four positioning slots on the outside.

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