Multi-friction parameter testing device for energetic material

Abstract

The utility model discloses an energetic material multi-friction parameter testing device, comprising an optical platform on which a high-speed displacement mechanism is arranged; the simulation bin is arranged on the optical platform; a sapphire window is formed in one side of the simulation bin, a high-speed infrared camera facing the sapphire window is installed outside the sapphire window, the simulation bin is externally connected with a refrigeration mechanism and a humidification mechanism, a heating mechanism and a friction testing mechanism are arranged in the simulation bin, and a skylight is formed in the top of the simulation bin. The friction testing mechanism is connected to the high-speed displacement mechanism through a skylight, and the skylight is provided with an elastic heat preservation film which is connected to the high-speed displacement mechanism and the friction testing mechanism at the same time. The device has the following beneficial effects that the device can be used for testing the friction characteristics of an energetic material interface at the same time under different testing environment conditions, so that multiple friction characteristic parameters are obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of energetic material interface detection. More specifically, the utility model relates to a multi-friction parameter testing device for energetic materials. BACKGROUND

[0002] During the whole life cycle of energetic materials, various friction effects inevitably exist at the interface of energetic materials, which increases the possibility of material damage, deformation, and even accidental ignition, posing a high safety hazard to the overall service safety of the materials. The tribological response characteristics of the energetic material interface are the key to explaining the friction safety, but the testing methods for the key friction characteristic parameters of the interface are not perfect.

[0003] There are various testing devices for the friction characteristic parameters of energetic material interfaces in the prior art. The existing publication No. CN211318152U discloses a high-low temperature vacuum friction and wear testing machine, which can test the friction force, friction coefficient, etc. of the energetic material interface under high-low temperature and vacuum environment, but the device cannot realize the synchronous testing of the friction temperature rise and the triboelectric characteristics of the energetic material interface during the friction process.

[0004] For example, the publication No. CN205139228U discloses a system for real-time online safety determination of explosive friction electrification voltage value. The device uses an automatic friction electrostatic voltage tester to test the friction electrification characteristics of explosive substitute materials, but the temperature and humidity of the environment during testing are difficult to control, and the friction force, friction coefficient, etc. of the energetic material and the friction characteristic parameters of the counterpart cannot be measured.

[0005] A new friction testing device for in-situ testing of interface friction coefficient and friction temperature rise has been developed by existing research teams, such as "An Investigation into the Surface Skidding Response of PBX 9501 and PBX 9502" (see Propellants, Explosives, Pyrotechnics, 2022, 47(7): e202200010). The device developed with the help of a high-speed infrared camera can test the load, friction force, and friction coefficient of the sliding interface of energetic materials, but only when the sapphire with high infrared transmittance is used as the friction counterpart material can the device real-time observe the changes of the friction hot spots of the energetic material interface over time. The temperature, humidity, etc. during the testing process are difficult to control, and the synchronous testing of the triboelectric characteristics of the energetic material interface during the friction process cannot be realized.

[0006] The above existing device can meet the test requirements under certain conditions, but the test parameters are single, and multiple parameters cannot be tested in situ and the synchronous change rule of multiple characteristic parameters cannot be analyzed. Utility model content

[0007] An object of the present utility model is to solve at least the above problems and / or defects and to provide at least the advantages explained later.

[0008] In order to achieve these objects and other advantages according to the present utility model, a kind of energetic material multi-friction parameter testing device is provided, comprising:

[0009] Optical platform, high-speed displacement mechanism is arranged on it;

[0010] Simulation bin is arranged on the optical platform;

[0011] Sapphire window is opened on one side of the simulation bin, high-speed infrared camera is installed opposite to the sapphire window, the simulation bin is connected with refrigeration mechanism and humidification mechanism, heating mechanism and friction test mechanism are arranged in the simulation bin, skylight is opened in the top of the simulation bin, the friction test mechanism is connected to high-speed displacement mechanism through skylight, the skylight is provided with elastic insulation film connected to high-speed displacement mechanism and friction test mechanism simultaneously.

[0012] Preferably, the simulation bin is connected with temperature and humidity display through bin wall.

[0013] Preferably, the heating mechanism can be provided as:

[0014] Heat insulation plate is arranged in the simulation bin, heating table is arranged on one side of the heat insulation plate, a plurality of fireproof plates are arranged outside the heating table, the plurality of fireproof plates are connected to bin wall and heat insulation plate through heat insulation glue, slot is opened above the connection position of heat insulation plate and fireproof plate.

[0015] Preferably, the high-speed displacement mechanism includes X-axis displacement device, Y-axis displacement device, U-shaped support and two Z-axis displacement devices, wherein:

[0016] The two Z-axis displacement devices are arranged on both sides of the simulation bin respectively, the sliding ends of the two Z-axis displacement devices are connected to the vertical end of U-shaped support respectively, X-axis displacement device is arranged on the horizontal end of U-shaped support, Y-axis displacement device is fixedly connected to the sliding end of X-axis displacement device and extends into skylight.

[0017] Preferably, the friction test mechanism is arranged on the other side of the heat insulation plate, and the friction test mechanism includes fixed end and moving end, wherein:

[0018] The mobile end comprises a clamp and a friction pair clamp fixedly connected with the clamp, the clamp is fixedly connected with a Y-axis displacement device vertically penetrating the skylight through a connecting plate, and the mobile end is connected to the skylight through an elastic heat preservation film at the same time as a sliding end of the Y-axis displacement device;

[0019] The fixed end is arranged on the optical platform through a supporting table, a plurality of pressure sensors are fixedly installed on the upper end of the supporting table, a bottom plate is connected to the upper ends of the plurality of pressure sensors at the same time, symmetrical pressing plates are vertically arranged on the bottom plate opposite the friction pair clamp, friction sensors are arranged opposite between the pressing plates, a test table is clamped between the friction sensors, and the pressing plates are fixedly connected through bolts.

[0020] Preferably, a supporting device is arranged below the test table, the supporting device comprises a U-shaped base and a plurality of bearings rotatably connected to the U-shaped base through pin shafts, and the plurality of bearings abut the lower end of the test table.

[0021] Preferably, a sensor fireproof frame is arranged above the pressure sensors, and the sensor fireproof frame is connected with the inner wall of the simulation bin and the heat insulation plate.

[0022] The utility model at least has following beneficial effects:

[0023] 1, this device can carry out friction and wear experiment to contain energy material under different environmental conditions, utilize heating, refrigeration system and sensor control environment while simulating experiment environment's temperature and humidity, then combine friction test system and realize multiple interface friction characteristic parameter synchronous in situ test.

[0024] 2, the friction test mechanism and the pressure test mechanism in this device are independent and constitute a friction test mechanism as a whole, the friction test mechanism and the mechanical movement system operate separately, and the high-speed displacement table can be directly adjusted to improve the friction precision and the size of the loading force of the equipment, so that the device has the advantages of high friction precision, adjustable test precision, convenient replacement of friction pair materials, large normal stress test bearing capacity and the like.

[0025] Other advantages, objects and features of the utility model will be embodied in part through the following description, and will be understood by those skilled in the art through research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is a multi-friction parameter testing device for energetic materials;

[0027] Fig. 2 It is an internal structure diagram of the testing device;

[0028] Fig. 3 It is an enlarged view of the internal structure of the testing device and the heating mechanism;

[0029] Fig. 4 is a friction test mechanism diagram;

[0030] Fig. 5 is a friction test mechanism front view;

[0031] Fig. 6 is a friction test mechanism side view.

[0032] Marked in the figure: 1, optical platform, 2, simulation bin, 3, refrigeration mechanism, 4, humidification mechanism, 5, skylight, 6, elastic heat preservation film, 7, sapphire window, 8, high-speed infrared camera, 20, temperature and humidity display, 30, heat insulation plate, 31, heating table, 32, fireproof plate, 33, slot, 41, X-axis displacement device, 42, Y-axis displacement device, 43, Z-axis displacement device, 44, U-shaped support, 50, clamp, 51, pair of friction pair clamps, 52, connecting plate, 53, support table, 54, pressure sensor, 55, bottom plate, 56, pressing plate, 57, friction sensor, 58, test table, 59, U-shaped base, 60, pin shaft, 61, bearing, 70, sensor fireproof frame. DETAILED DESCRIPTION

[0033] The utility model makes further detailed description in combination with the drawings below, to make the person skilled in the art refer to the description of the text can be implemented.

[0034] It should be understood that the terms such as “have”, “contain” and “include” used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0035] It should be noted that in the description of the utility model, the orientation or position relationship indicated by the terms is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, structure and operation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms “first”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the utility model, unless otherwise explicitly specified and limited, the terms “mount”, “provided with”, “sleeved / connected”, “connected” and the like should be understood broadly, for example, “connected” can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through an intermediate medium, can be the communication inside two elements, and the specific meaning of the above terms in the utility model can be understood according to the specific circumstances for the person skilled in the art.

[0037] In addition, in the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] like Figs. 1-6 As shown, a multi-friction parameter testing device for energetic materials comprises:

[0039] An optical platform 1, on which a high-speed displacement mechanism is provided;

[0040] A simulation chamber 2, which is arranged on the optical platform 1;

[0041] A sapphire window 7 is provided on one side of the simulation chamber 2, and a high-speed infrared camera 8 is installed facing the sapphire window 7. The simulation chamber 2 is externally connected to a refrigeration mechanism 3 and a humidification mechanism 4. A heating mechanism and a friction testing mechanism are provided inside the simulation chamber 2. A skylight 5 is provided on the top of the simulation chamber 2, and the friction testing mechanism is connected to the high-speed displacement mechanism through the skylight 5. The skylight 5 is provided with an elastic thermal insulation film 6 that is simultaneously connected to the high-speed displacement mechanism and the friction testing mechanism.

[0042] Working principle:

[0043] Through the above-described structure, the operator can place the energetic material on the friction testing mechanism. The friction testing mechanism then controls the temperature and humidity within the simulation chamber 2 through the cooling mechanism 3, humidifying mechanism 4, and heating mechanism. Simultaneously, the high-speed displacement mechanism located on the optical platform 1 is operated to drive the friction testing mechanism to perform interface friction testing on the energetic material, thereby obtaining characteristic parameters related to the friction test. The provision of the elastic thermal insulation film 6 minimizes the impact of temperature and humidity factors outside the skylight 5 on the temperature and humidity within the simulation chamber 2. The high-speed infrared camera 8 can constantly record the temperature changes at the energetic material interface during the friction process through the sapphire window 7. The operator can use the temperature data recorded by the high-speed infrared camera 8 to obtain changes in parameters such as friction temperature rise and friction work-to-heat conversion coefficient.

[0044] In the above technical solution, the simulation chamber 2 is externally connected to a temperature and humidity display 20 through the chamber wall.

[0045] Through the above arrangement, the operator can observe the temperature and humidity in the simulation chamber 2 by observing the temperature and humidity display 20 in real time, thereby achieving precise control of the temperature and humidity in the simulation chamber 2.

[0046] In the above technical solution, the heating mechanism can be configured as:

[0047] An insulation board 30 is provided in the simulation warehouse 2, a heating platform 31 is provided on one side of the insulation board 30, and multiple fireproof boards 32 are provided outside the heating platform 31. The multiple fireproof boards 32 are connected to the simulation warehouse wall and the insulation board 30 through insulation glue, and a slot 33 is provided above the connection between the insulation board 30 and the fireproof board 32.

[0048] Through the above-mentioned settings, the setting of the fireproof board 32 and the thermal insulation glue ensures that the high temperature generated by the heating platform 31 will not damage the wall of the simulation chamber 2, the thermal insulation board 30 ensures that the high temperature generated by the heating platform 31 will not damage the mechanism located on the other side of the thermal insulation board 30, and the setting of the slot 33 ensures that the heat generated by the heating platform 31 can be efficiently conducted to the other side of the thermal insulation board.

[0049] In the above technical solution, the high-speed displacement mechanism includes an X-axis displacement device 41, a Y-axis displacement device 42, a U-shaped bracket 44 and two Z-axis displacement devices 43, wherein:

[0050] The two Z-axis displacement devices 43 are respectively arranged on both sides of the simulation chamber 2, and the sliding ends of the two Z-axis displacement devices 43 are respectively connected to the vertical ends of the U-shaped bracket 44. The horizontal end of the U-shaped bracket 44 is provided with an X-axis displacement device 41, and the sliding end of the X-axis displacement device 41 is fixedly connected to the Y-axis displacement device 42, the end of which extends into the skylight 5.

[0051] Through the above-mentioned arrangement, the device can realize the longitudinal displacement of the connected friction testing mechanism through two Z-axis displacement devices 43. The X-axis displacement device 41 is arranged on the U-shaped bracket 42 to ensure that the friction testing mechanism can move horizontally. The Y-axis displacement device 42 can drive the friction testing mechanism to perform vertical pressure and friction tests on the energetic material (friction pair).

[0052] In the above technical solution, the friction testing mechanism is arranged on the other side of the heat insulation plate 30, and the friction testing mechanism includes a fixed end and a movable end, wherein:

[0053] The movable end includes a clamp 50 and a friction pair clamp 51 fixedly connected to the clamp 50. The clamp 50 is fixedly connected to the Y-axis displacement device 42 that vertically penetrates the skylight 5 via a connecting plate 52. The movable end and the sliding end of the Y-axis displacement device 42 are also connected to the skylight 5 via an elastic insulation film 6.

[0054] The fixed end is arranged on the optical platform 1 through the support table 53, a plurality of pressure sensors 54 are fixedly installed on the upper end of the support table 53, the upper end of the plurality of pressure sensors 54 is connected with a bottom plate 55 at the same time, the bottom plate 55 is vertically provided with symmetrical pressing plates 56 opposite to the friction pair clamp 51, friction sensors 57 are arranged between the pressing plates 56, test tables 58 are clamped between the friction sensors 57, and the pressing plates 56 are fixedly connected through bolts.

[0055] Through the above arrangement, the operator needs to fix and place the energetic material (friction pair) on the test table 58, simultaneously externally connects the display instrument with the pressure sensor 54 and the friction sensor 57, and drives the friction pair clamp 51 to move the energetic material (friction pair) in multiple directions through the operation of the displacement device 41, so as to achieve the friction test of the energetic material (friction pair).

[0056] When the high-speed displacement device drives the friction pair clamp 51 to move downward to extrude the energetic material (friction pair) and simultaneously slide left and right, the energetic material (friction pair) is subjected to the downward normal pressure and sliding friction force applied by the friction pair clamp 51 at this time, at this time, the friction sensor 57 and the pressure sensor 54 respectively record the changes of the friction force and the normal pressure in the friction process, the recorded friction force and normal pressure are transmitted to the display instrument after processing, so that the change of the friction coefficient can be obtained, at the same time, the high-speed infrared camera 8 records the temperature change of the friction interface of the energetic material in the friction process at all times, and the temperature data recorded by the high-speed infrared camera 8 can obtain the change of the friction temperature rise, the friction work heat conversion coefficient and other parameters.

[0057] If the energetic material (friction pair) is subjected to the electrification friction test, the electrically conductive needle tip is arranged at the bottom of the friction pair clamp 51, the insulating film is arranged between the electrically conductive needle tip and the friction pair clamp 51, the energetic material (friction pair) is adhered to the electrically conductive needle tip and directly contacts the electrically conductive needle tip, the copper sheet on the test table 58 is externally connected with an electrometer, and then the displacement device 41 drives the friction pair clamp 51 to drive the energetic material (friction pair) on the electrically conductive needle tip to move in multiple directions on the copper sheet, and the operator can collect and record the friction electrification voltage and other parameters on the copper sheet through the electrometer.

[0058] The arrangement of the elastic heat preservation film 6 ensures that the sliding end on the Y-axis displacement device 42 moves up and down, drives the elastic heat preservation film 6 to elastically stretch and contract up and down, and does not damage the elastic stretch film 6; the bolt fixed connection between the pressing plates 56 ensures the stability of the structure between the test table 58 and the pressing plates 56, the pressing plate 55 ensures the stable stress of the pressure sensor 54; the heat insulation plate 30 also ensures that the high temperature generated by the heating table 31 does not damage the friction test mechanism. The connecting plate 52 ensures that the clamp 50 can be stably connected to the displacement device 41 extending into the skylight 5.

[0059] In the above technical solution, the support device is arranged below the test table 58, and comprises a U-shaped base 59 and a plurality of bearings 61 rotatably connected to the U-shaped base 59 through a pin shaft 60, and the plurality of bearings 61 abut the lower end of the test table 58.

[0060] Through the above arrangement, the support device balances the downward normal pressure received by the energetic material (friction pair) located on the test table 58, at this time, the plurality of bearings 61 located on the U-shaped base 59 can provide a support force in the opposite direction to the test table 58, and when the normal pressure received by the test table 58, the friction force between the friction sensor 57 and the test table 58, and the support force provided by the support device form a four-force balance, at this time, under the condition that the normal pressure is unchanged, the support device can reduce the friction force between the friction sensor 57 and the test table 58, so that the friction sensor 57 receives smaller external force, thereby achieving the effect of protecting the friction sensor 57. At the same time, the plurality of bearings 61 can roll through the pin shaft 60 to reduce the influence on the friction sensor 57 when the energetic material is moved left and right by the friction pair clamp 50.

[0061] In the above technical solution, the pressure sensor 54 is arranged above the sensor fireproof frame 70, and the sensor fireproof frame 70 is connected with the inner wall of the simulation bin 2 and the heat insulation plate 30.

[0062] Through the above arrangement, the pressure sensor 54 is arranged in the small space formed by the sensor fireproof frame 70 and the heat insulation plate 30, which avoids damage of the pressure sensor 54 caused by high temperature generated by the heating table 31, and avoids burning of the circuit and damage of the pressure sensor 54 caused by combustion of the energetic material due to high temperature generated by friction.

[0063] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A device for testing multiple friction parameters of energetic materials, comprising: an optical platform on which a high-speed displacement mechanism is provided; The simulation chamber is arranged on an optical platform and is characterized by: A sapphire window is provided on one side of the simulation chamber, a high-speed infrared camera is installed facing the sapphire window, a refrigeration mechanism and a humidification mechanism are connected to the outside of the simulation chamber, a heating mechanism and a friction testing mechanism are provided inside the simulation chamber, a skylight is provided on the top of the simulation chamber, the friction testing mechanism is connected to the high-speed displacement mechanism through the skylight, and the skylight is provided with an elastic thermal insulation film that is simultaneously connected to the high-speed displacement mechanism and the friction testing mechanism.

2. The multi-friction parameter testing device for energetic materials according to claim 1, characterized in that: The simulation chamber is externally connected to a temperature and humidity display via the chamber wall.

3. The multi-friction parameter testing device for energetic materials according to claim 1, characterized in that: The heating mechanism can be configured as follows: An insulation board is provided in the simulation warehouse, a heating platform is provided on one side of the insulation board, and multiple fireproof boards are provided outside the heating platform. The multiple fireproof boards are connected to the simulation warehouse wall and the insulation board through insulation glue, and a slot is provided above the connection between the insulation board and the fireproof board.

4. The multi-friction parameter testing device for energetic materials according to claim 3, characterized in that: The high-speed displacement mechanism includes an X-axis displacement device, a Y-axis displacement device, a U-shaped bracket and two Z-axis displacement devices, wherein: The two Z-axis displacement devices are respectively arranged on both sides of the simulation chamber, and the sliding ends of the two Z-axis displacement devices are respectively connected to the vertical ends of the U-shaped bracket. The horizontal end of the U-shaped bracket is provided with an X-axis displacement device, and the sliding end of the X-axis displacement device is fixedly connected to a Y-axis displacement device whose end extends into the skylight.

5. The multi-friction parameter testing device for energetic materials according to claim 4, characterized in that: The friction testing mechanism is arranged on the other side of the heat insulation board, and the friction testing mechanism includes a fixed end and a movable end, wherein: The movable end includes a fixture and a friction pair fixture fixedly connected to the fixture. The fixture is fixedly connected to a Y-axis displacement device that vertically penetrates the skylight via a connecting plate. The movable end and the sliding end of the Y-axis displacement device are simultaneously connected to the skylight via an elastic insulation film. The fixed end is set on the optical platform through a support platform, and a plurality of pressure sensors are fixedly installed on the upper end of the support platform. The upper ends of the plurality of pressure sensors are simultaneously connected to a base plate. Symmetrical pressure plates are vertically arranged on the base plate opposite to the friction pair fixture, and facing friction sensors are arranged between the pressure plates. A test bench is clamped between the friction sensors, and the pressure plates are fixedly connected by bolts.

6. The multi-friction parameter testing device for energetic materials according to claim 5, characterized in that: A supporting device is provided below the test bench. The supporting device includes a U-shaped base and a plurality of bearings rotatably connected to the U-shaped base through pins. The plurality of bearings are close to the lower end of the test bench.

7. The multi-friction parameter testing device for energetic materials according to claim 5, characterized in that: A sensor fireproof frame is provided above the pressure sensor, and the sensor fireproof frame is connected to the inner wall of the simulation chamber and the heat insulation board.

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