Test fixture for thermal barrier coating testing

Abstract

The application provides a test tool for heat protection coating test, which comprises a test piece mounting support, an electromagnetic high-speed pulling and releasing device, a base rotating shaft assembly and a foundation assembly; the upper end of the test piece mounting support is provided with a test sample; the test piece mounting support is arranged on the foundation assembly, and the electromagnetic high-speed pulling and releasing device is also arranged on the foundation assembly; the front end of the lower seat of the test piece mounting support is connected with the foundation assembly through the high-speed pulling and releasing device, and the rear end of the lower seat is hinged to the foundation assembly through the base rotating shaft assembly; when the electromagnetic high-speed pulling and releasing device is powered on, the electromagnetic high-speed pulling and releasing device limits the front end of the lower seat of the test piece mounting support on the foundation assembly; when the electromagnetic high-speed pulling and releasing device is powered off, the electromagnetic high-speed pulling and releasing device releases the test piece mounting support. The application can realize convenient test of the heat protection effect of the heat protection coating.

Description

Technical Field

[0001] This invention relates to test fixtures, specifically, to a test fixture used for mounting a heat-resistant coating during hot testing of a solid rocket booster engine. Background Technology

[0002] The launch pad heat-resistant coating was tested through multiple test runs. In accordance with the requirements for the heat-resistant coating loading test during the ground hot test of the solid rocket motor, the heat-resistant coating was allowed to work for about 5 seconds under the action of the gas flow. The temperature of the test piece was measured in real time by a temperature sensor to test the heat-resistant effect of the heat-resistant coating. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the purpose of this invention is to provide a test fixture for testing heat-resistant coatings.

[0004] The test fixture for testing heat-resistant coatings provided by the present invention includes: a test specimen mounting bracket 2, an electromagnetic high-speed restraint and release device, a base rotating shaft assembly, and a foundation assembly;

[0005] The test specimen is provided at the upper end of the test specimen mounting bracket;

[0006] The test specimen mounting bracket is mounted on the foundation component, and the electromagnetic high-speed restraint and release device is also mounted on the foundation component;

[0007] The front end of the test specimen mounting bracket is connected to the foundation component via the high-speed restraint and release device, and the rear end is hinged to the foundation component via the base rotating shaft assembly.

[0008] When the electromagnetic high-speed restraint and release device is energized, it limits the front end of the lower seat of the test specimen mounting bracket to the foundation component. When the power is de-energized, the electromagnetic high-speed restraint and release device releases the test specimen mounting bracket.

[0009] Preferably, the test specimen includes a heat-resistant coating, a coated plate, and an epoxy board;

[0010] The epoxy board is fixed to the coated board; the heat-resistant coating covers the exposed sides of the coated board.

[0011] Preferably, the test specimen mounting bracket includes a mounting box, a rotating bracket, a shock absorption assembly, and a restraint release seat;

[0012] The mounting box is provided at the top of the rotary support; the shock absorption component is provided on the rear side of the rotary support.

[0013] The front end of the rotary support is provided with a restraint release seat, through which the high-speed restraint release device can be detachably connected.

[0014] Preferably, the rotary support includes a support stiffener, a first support connecting rod, a second support connecting rod, and a third support connecting rod;

[0015] One end of the third support link is connected to the lower end of the second support link, and the other end is connected to the lower end of the first support link. The upper end of the second support link is connected to the upper region of the first support link.

[0016] The support stiffeners are installed on the first support connecting rod and the second support connecting rod.

[0017] Preferably, the damping assembly includes a first circular tube, a second circular tube, and a damping plate.

[0018] The second circular tube is disposed inside the first circular tube, and the first circular tube is connected to the support rod through the shock-absorbing plate;

[0019] The first round tube, the second round tube, and the shock-absorbing plate are all connected to the support connecting rod.

[0020] Preferably, the electromagnetic high-speed restraint and release device includes a parallel four-bar linkage, a solenoid valve, and a suction cup;

[0021] The four-bar linkage includes a restraining arm, a first restraining link, a second restraining link, and a column, a support block, and a vertical plate mounted on the base plate;

[0022] One end of the restraining arm is hinged to the top of the column, and the other end is hinged to the top of the first restraining link. The top of the support block is hinged to the bottom of the second restraining link.

[0023] The suction cup is hinged to the bottom end of the first restraining link and the top end of the second restraining link;

[0024] The solenoid valve is provided on the inner side of the upright plate; the solenoid valve is connected to the suction cup when energized and disconnected from the suction cup when de-energized.

[0025] Preferably, the rotating shaft assembly includes a bracket rotating shaft seat, a base rotating shaft, and a base;

[0026] The bracket pivot seat is screwed to the bottom of the bracket connecting rod, and the base is screwed to the foundation component;

[0027] The base pivot is mounted on the base; the bracket pivot seat is sleeved on the outside of the base pivot and is rotatably connected to the base pivot.

[0028] Preferably, the foundation components include a foundation frame, anchor bolts, two cover plates, and a bottom plate mounting plate;

[0029] The cover plate and the base plate mounting plate are mounted on the foundation frame;

[0030] The basic frame is used to connect to the cement foundation of the test site via anchor bolts.

[0031] Preferably, the flip control circuit includes a first DC power supply, a second DC power supply, and a time delay relay;

[0032] The positive terminal of the first DC power supply is connected to the negative terminal of the first DC power supply in sequence through the control terminal of the time delay relay, the emergency stop button, and the temperature protector;

[0033] The positive terminal of the second DC power supply is connected to the electromagnet of the solenoid valve and the switch of the time delay relay in sequence, and then connected to the negative terminal of the first DC power supply.

[0034] Preferably, the restraint release seat remains upright while the restraint arm is pressed. After ignition for several seconds, the restraint arm is de-energized by the solenoid valve to release the restraint release seat. The restraint arm rotates clockwise under the action of the restraint release seat, thereby releasing the tooling restraint release seat.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] This invention not only allows for comparative experiments on multiple test blocks with different thermal protection coatings under the same test conditions, but also withstands the upward pull-out load generated by the gas flow impacting the support after rocket ignition. Five seconds after rocket ignition, the high-speed release mechanism releases the support, and the test piece mounting bracket rotates 90° clockwise under the thrust of the gas flow, thus controlling the gas flow to scour the test piece for 5 seconds and achieving convenient testing of the thermal protection effect of the thermal protection coating. Attached Figure Description

[0037] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 This is the original test image of the heat-resistant coating mounting fixture used in the hot test of this invention.

[0039] Figure 2 This is a schematic diagram of the structure of the heat-resistant coating mounting fixture in the hot test of this invention.

[0040] Figure 3 This is a cross-sectional schematic diagram of the tooling used for the hot test of the heat-resistant coating in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the test specimen in an embodiment of the present invention;

[0042] Figure 5 This is an exploded view of the test specimen in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the structure of the test specimen mounting bracket in an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the installation of the test specimen in an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the mounting box and bracket in an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the structural state of the restraint and release device when the solenoid valve is energized in an embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the structural state of the restraint and release device in one direction after the solenoid valve is de-energized in an embodiment of the present invention.

[0048] Figure 11 This is a schematic diagram of the structural state of the restraint and release device in another direction after the solenoid valve is de-energized in an embodiment of the present invention.

[0049] Figure 12 This is a schematic diagram of the structure of the rotating shaft assembly in an embodiment of the present invention;

[0050] Figure 13 This is a schematic diagram of the foundation component in an embodiment of the present invention; and

[0051] Figure 14 This is a circuit diagram of the flip control circuit in an embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0053] like Figure 1As shown, the experimental principle of this invention is that the top of the heat-resistant coating mounting fixture is flush with the center of the solid rocket motor during the Xth test, about 2.5 meters above the ground and 20 meters away from the tail end of the rocket. The outer surface of this invention is coated with heat-resistant coating material. After ignition for 5 seconds, the test specimen support is released through the release device. The support rotates clockwise under the action of the gas flow, so that the heat-resistant coating works for about 5 seconds. Then, the temperature of the test specimen on the support is monitored in real time by a temperature sensor to test the heat-resistant effect of the heat-resistant coating.

[0054] Figure 2 This is a schematic diagram of the structure of the heat-resistant coating mounting fixture used in the hot test of this invention, as shown in the embodiment of the invention. Figure 2 As shown, the hot test heat-resistant coating mounting fixture provided by the present invention includes a test specimen 1, a test specimen mounting bracket 2, an electromagnetic high-speed restraint and release device 3, a base shaft assembly 4, and a foundation assembly 5.

[0055] The test specimen 1 is provided at the upper end of the test specimen mounting bracket 2;

[0056] The test specimen mounting bracket 2 is mounted on the foundation component 5, and the electromagnetic high-speed restraint and release device 3 is also mounted on the foundation component 5;

[0057] The front end of the lower seat of the test specimen mounting bracket 2 is connected to the foundation component 5 through the high-speed restraint and release device 3, and the rear end is hinged to the foundation component 5 through the base rotating shaft assembly 4;

[0058] When the electromagnetic high-speed restraint and release device 3 is powered on, it limits the front end of the lower seat of the test specimen mounting bracket 2 to the foundation component 5. When the power is off, the electromagnetic high-speed restraint and release device 3 releases the test specimen mounting bracket 2.

[0059] Figure 3 This is a cross-sectional schematic diagram of the tooling used for the hot-test test of the heat-resistant coating in an embodiment of the present invention, as shown below. Figure 3 As shown, the test specimen 1 is detachably connected to the upper end of the test specimen mounting bracket 2, and each specimen 1 is a detachable independent structure.

[0060] Figure 4 This is a schematic diagram of the test specimen in an embodiment of the present invention. Figure 5 This is an exploded view of the test specimen in an embodiment of the present invention, such as... Figure 4 , Figure 5 As shown, the test specimen includes a heat-resistant coating 111, a coating plate 112, and an epoxy plate 113; the epoxy plate 113 is fixed on the coating plate 112; the heat-resistant coating 111 covers the exposed outer side of the coating plate 112; the coating plate 112 is made of steel plate;

[0061] In this embodiment of the invention, epoxy board 113 is used as the base frame, and the coating thickness and size of the heat-resistant coating 111 are controlled by a square mold. The size of the test sample is 156mm×156mm×58mm.

[0062] Figure 6 This is a schematic diagram of the structure of the test specimen mounting bracket in an embodiment of the present invention, as shown below. Figure 6 As shown, the test specimen mounting bracket 2 includes a mounting box 21, a rotating bracket 22, a shock absorption assembly 23, and a restraint release seat 24;

[0063] The mounting box 21 is welded to the top of the rotary support 22; the shock absorption component 23 is provided on the rear side of the rotary support 22.

[0064] The front end of the rotary support 22 is provided with a restraint release seat 24, through which the high-speed restraint release device 3 can be disassembled.

[0065] The mounting box 21 includes two first cover plates and four second cover plates. The four second cover plates are connected in sequence to form a cylindrical structure with a rectangular cross-section; the first cover plates are provided at both ends of the cylindrical structure.

[0066] Both the first cover plate and the second cover plate are made of steel plate, and the dimensions of the first cover plate are 100mm×100mm.

[0067] The first cover plate includes a left cover plate 215 and a right cover plate 216; the second cover plate includes an upper cover plate 212, a rear cover plate 213, a lower cover plate 214, and a mounting panel 211.

[0068] The rotary support 22 includes a support stiffener 224, a first support connecting rod 221, a second support connecting rod 222, and a third support connecting rod 223;

[0069] One end of the third support link 223 is connected to the lower end of the second support link 222, and the other end is connected to the lower end of the first support link 221. The upper end of the second support link 222 is connected to the upper region of the first support link 22.

[0070] The support stiffener 224 is provided on the first support connecting rod 221 and the second support connecting rod 222.

[0071] Figure 7 This is a schematic diagram of the installation of the test specimen in an embodiment of the present invention, as shown below. Figure 7 As shown, six test specimens 1 are arranged and installed on the mounting box 21. Five sides of the test specimens 1 are coated with a 30mm thick heat-resistant coating, and one side is fitted with an epoxy board with a temperature measurement hole.

[0072] A 10mm thick silicone rubber sheet is pressed between the test specimen 1 and the mounting panel 211 of the mounting box 21. A force sensor can be installed inside the mounting box 21.

[0073] The restraint release seat 24 is welded to one end of the support connecting rod 223.

[0074] like Figure 8 As shown, the damping assembly 23 includes a first circular tube 231 with an outer diameter of 200 mm and a width of 80 mm, a second circular tube 232 with an outer diameter of 100 mm and a width of 80 mm, and a damping plate 233.

[0075] The second circular tube 232 is disposed inside the first circular tube 231, and the first circular tube 231 is connected to the support rod 221 through the shock-absorbing plate 233;

[0076] The first round tube 231, the second round tube 232 and the damping plate 233 are all screwed onto the support connecting rod 221.

[0077] Figure 9 This is a schematic diagram of the structural state of the restraining and releasing device when the solenoid valve is energized in an embodiment of the present invention, as shown below. Figure 9 As shown, the electromagnetic high-speed restraint and release device 3 includes a parallel four-bar linkage, a solenoid valve 38, and a suction cup 34.

[0078] The four-bar linkage includes a restraining arm 31, a first restraining link 32, a second restraining link 33, and a column 35, a support block 36, and a vertical plate 37 mounted on the base plate 310.

[0079] One end of the restraining arm 31 is hinged to the top of the column 35 via the first connecting rod pivot 391, and the other end is hinged to the top of the first restraining link 32 via the second connecting rod pivot 392. The top of the support block 36 is hinged to the bottom of the second restraining link 33.

[0080] like Figure 11 As shown, the suction cup 34 is hinged to the bottom end of the first restraining link 32 and the top end of the second restraining link 33 via the third link pivot 393;

[0081] like Figure 10 As shown, the solenoid valve 38 is provided on the inner side of the upright plate 37;

[0082] In this embodiment of the invention, the hinge is achieved by a pivot hinge, and the base plate 310 is fixed to the foundation component 5 by bolts.

[0083] Considering a safety factor of 2, the electromagnetic high-speed restraint and release device should use a solenoid valve with a suction force of not less than 250 kg and a clamping force of not less than 20 t to ensure that the fixture does not flip when the solenoid valve is energized.

[0084] Figure 12 This is a schematic diagram of the structure of the rotating shaft assembly in an embodiment of the present invention, as shown below. Figure 12 As shown, the rotating shaft assembly 4 includes a bracket rotating shaft seat 41, a base rotating shaft 43, and a base 42;

[0085] The bracket pivot seat 41 is screwed to the bottom of the bracket connecting rod 221, and the base 42 is screwed to the foundation component 6;

[0086] The base shaft 43 is mounted on the base 42; the bracket shaft seat 41 is sleeved on the outside of the base shaft 43 and is rotatably connected to the base shaft 43.

[0087] Figure 13 This is a schematic diagram of the foundation component in an embodiment of the present invention, as shown below. Figure 13 As shown, the foundation component 5 includes a foundation frame 51, M20 anchor bolts 52, two cover plates 53, and a bottom plate mounting plate 54;

[0088] The cover plate 53 and the bottom plate mounting plate 54 are disposed on the base frame 51;

[0089] The foundation frame 51 is connected to the concrete foundation of the test site via anchor bolts 52. 36 anchor bolt holes need to be drilled in the concrete foundation, and the layout of the holes is as follows: Figure 13 As shown, the aperture is 150mm and the depth is 400mm.

[0090] Anchor bolts 52 are pre-embedded and fixed using C40 micro-expansion concrete in a secondary pour, with a embedment depth of not less than 350mm. The test site provides cable routing steel for cable protection, which is fixed to the launch site foundation. The cable routing steel is fixed to the foundation using expansion bolts, and the routing space provided by the cable routing steel is not less than 50mm × 80mm.

[0091] Figure 14 This is a circuit diagram of the flip control circuit in an embodiment of the present invention, such as... Figure 14 As shown, the flip control circuit includes a first DC power supply, a second DC power supply, and a time delay relay;

[0092] The positive terminal of the first DC power supply is connected to the negative terminal of the first DC power supply in sequence through the control terminal of the time delay relay, the emergency stop button, and the temperature protector;

[0093] The positive terminal of the second DC power supply is connected to the electromagnet of the solenoid valve and the switch of the time delay relay in sequence, and then connected to the negative terminal of the first DC power supply.

[0094] The flip control circuit controls the current supply and demand of the solenoid valve. The flip control is implemented by the temperature protector, and the emergency button provides manual backup control. When the rocket ignites, the temperature protector's temperature rises rapidly under the action of the gas flow. The power-off delay coil is de-energized, and the power-off delay disconnects after a 5-second delay. The solenoid valve is de-energized, and the system controls the electromagnetic high-speed restraint release device to release the pressure. The present invention rotates clockwise at high speed under the action of the gas flow, realizing the sample's separation from the gas flow and enabling operation under the gas flow for 5 seconds.

[0095] When implementing the hot-test test fixture for the heat-resistant coating of the present invention, the specific steps are as follows:

[0096] The heat-resistant coating mounting fixture (hereinafter referred to as the hot-testing fixture) of the present invention is fixedly installed at the test site beforehand, such as... Figure 13 As shown, 36 casting holes were drilled on the cement foundation. The anchor bolt casting holes were symmetrical about the rocket axis. The front hole was 19 meters away from the engine tail. Then, the base frame 51 of the hot test fixture was used as the positioning of the M20 anchor bolts 52. Concrete was poured by pre-embedded anchor bolts 52 to fix the base frame 51 to the cement foundation of the test site.

[0097] During the test, before engine ignition, combined with Figure 9 , Figure 14 When the flip control circuit is energized, the solenoid valve 38 and the suction cup 34 are tightly attracted, utilizing the dead point of motion and the lever arm to achieve a small control force to lock a large locking force. The head of the restraining arm 31 is pressed tightly against the restraining release seat 24, keeping the bracket 2 upright, with the test sample 1 facing the rocket engine; after the engine ignites, combined with Figure 10 , Figure 11 , Figure 14 The temperature protector in the control circuit rapidly rises in temperature under the influence of the gas flow, de-energizing the power-off delay coil. After a 5-second delay, the power-off delay disconnects, de-energizing the solenoid valve 38. The suction cup 34 immediately disengages, causing the restraining arm 31 to rotate clockwise at high speed around the first connecting rod shaft 391, releasing the clamping force. Under the influence of the gas flow, the bracket 2 rotates at high speed around the shaft 43 to a horizontal position. The shock-absorbing component 23 on the bracket connecting rod 221 provides some shock absorption. During the experiment, force sensors, heat flow sensors, and other sensors monitor and collect the state parameters of the test specimen in real time. After the fixture is flipped to a horizontal position, the test specimen is rotated from facing the engine to being parallel to the ground, avoiding the impact and erosion of the gas flow.

[0098] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A test fixture for testing heat-resistant coatings, characterized in that, include: The test specimen mounting bracket, the electromagnetic high-speed restraint and release device, the base shaft assembly, and the foundation assembly; The test specimen is provided at the upper end of the test specimen mounting bracket; The test specimen mounting bracket is mounted on the foundation component, and the electromagnetic high-speed restraint and release device is also mounted on the foundation component; The front end of the test specimen mounting bracket is connected to the foundation component through the high-speed restraint and release device, and the rear end is hinged to the foundation component through the base rotating shaft assembly. When the electromagnetic high-speed restraint and release device is energized, it limits the front end of the lower seat of the test specimen mounting bracket to the foundation component. When the power is off, the electromagnetic high-speed restraint and release device releases the test specimen mounting bracket. The test specimen includes a heat-resistant coating, a coating plate, and an epoxy board. The epoxy board is fixed to the coated board; the heat-resistant coating covers the exposed sides of the coated board.

2. The test fixture for testing heat-resistant coatings according to claim 1, characterized in that, The test specimen mounting bracket includes a mounting box, a rotating bracket, a shock absorption assembly, and a restraint release seat; The mounting box is provided at the top of the rotary support; the shock absorption component is provided on the rear side of the rotary support. The front end of the rotary support is provided with a restraint release seat, through which the high-speed restraint release device can be detachably connected.

3. The test fixture for testing heat-resistant coatings according to claim 2, characterized in that, The rotary support includes a support stiffener, a first support connecting rod, a second support connecting rod, and a third support connecting rod; One end of the third support link is connected to the lower end of the second support link, and the other end is connected to the lower end of the first support link. The upper end of the second support link is connected to the upper region of the first support link. The support stiffeners are installed on the first support connecting rod and the second support connecting rod.

4. The test fixture for testing heat-resistant coatings according to claim 3, characterized in that, The vibration damping assembly includes a first circular tube, a second circular tube, and a vibration damping plate. The second circular tube is disposed inside the first circular tube, and the first circular tube is connected to the first support rod through the shock-absorbing plate; The first circular tube, the second circular tube, and the shock-absorbing plate are all connected to the first support connecting rod.

5. The test fixture for testing heat-resistant coatings according to claim 2, characterized in that, The electromagnetic high-speed restraint and release device includes a parallel four-bar linkage, a solenoid valve, and a suction cup. The four-bar linkage includes a restraining arm, a first restraining link, a second restraining link, and a column, a support block, and a vertical plate mounted on the base plate. One end of the restraining arm is hinged to the top of the column, and the other end is hinged to the top of the first restraining link. The top of the support block is hinged to the bottom of the second restraining link. The suction cup is hinged to the bottom end of the first restraining link and the top end of the second restraining link; The solenoid valve is provided on the inner side of the upright plate; the solenoid valve is connected to the suction cup when energized and disconnected from the suction cup when de-energized.

6. The test fixture for testing heat-resistant coatings according to claim 3, characterized in that, The rotating shaft assembly includes a bracket rotating shaft seat, a base rotating shaft, and a base; The bracket pivot seat is screwed to the bottom of the first bracket connecting rod, and the base is screwed to the foundation component; The base pivot is mounted on the base; the bracket pivot seat is sleeved on the outside of the base pivot and is rotatably connected to the base pivot.

7. The test fixture for testing heat-resistant coatings according to claim 1, characterized in that, The foundation components include a foundation frame, anchor bolts, two cover plates, and a bottom plate mounting plate; The cover plate and the base plate mounting plate are mounted on the foundation frame; The basic frame is used to connect to the cement foundation of the test site via anchor bolts.

8. The test fixture for testing heat-resistant coatings according to claim 5, characterized in that, It also includes a flip control circuit; the flip control circuit includes a first DC power supply, a second DC power supply, and a time delay relay; The positive terminal of the first DC power supply is connected to the negative terminal of the first DC power supply in sequence through the control terminal of the time delay relay, the emergency stop button, and the temperature protector; The positive terminal of the second DC power supply is connected to the negative terminal of the second DC power supply in sequence through the electromagnet of the solenoid valve and the switch of the time delay relay.

9. The test fixture for testing heat-resistant coatings according to claim 5, characterized in that, The restraint release seat remains upright while the restraint arm is pressed. After ignition for several seconds, the restraint arm is de-energized by the solenoid valve to release the restraint release seat. The restraint arm rotates clockwise under the action of the restraint release seat, thereby releasing the tooling restraint release seat.

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