Engine hot test run DIC strain measurement system protection device and installation and use method thereof

Abstract

The invention provides an engine hot test run DIC strain measurement system protection device and an installation and use method thereof. The protection device comprises a protection cover assembly, a posture adjusting assembly and a support assembly. The protective cover assembly is provided with a closed space for installing the DIC image acquisition camera, and the side wall of the protective cover assembly is provided with a high-temperature-resistant transparent window plate and a thermal insulation layer for thermal protection, so that the DIC image acquisition camera is prevented from being heated due to environmental radiation to influence the image acquisition effect; the posture adjusting assembly comprises a pitching posture adjusting table and a horizontal posture adjusting seat, the protective cover assembly is connected to the pitching posture adjusting table, and the pitching posture adjusting table is rotationally connected to the horizontal posture adjusting seat; the support assembly comprises a supporting frame and a position adjusting plate, and the position adjusting plate is movably connected to the supporting frame. The horizontal posture adjusting seat is rotationally connected to the position adjusting plate and is provided with a vibration reduction piece, and the comprehensive protection effect on the heat-vibration-explosion environment is achieved; the horizontal and pitching angles of image acquisition can be adjusted, the acquisition flexibility is improved, and the environmental adaptability of the DIC strain measurement system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of DIC strain measurement system protection, and in particular to a DIC strain measurement system protection device for engine hot test and an installation and use method thereof. Background Art

[0002] For example, in the development and hot test of liquid rocket engines, the parameters of the strain field of key components are important parameters of the engine fault diagnosis system and one of the evaluation indicators for rapid diagnosis of the engine health status.

[0003] The measurement of strain parameters can be divided into two categories: one is the contact measurement method represented by the resistance strain gauge, which has the advantages of large range, high sensitivity and wide application range, but cannot measure the strain field; the other is the full-field non-contact optical measurement method, including digital moiré method, speckle interferometry method, digital image correlation (DIC) measurement method, etc., which has the advantage of strain field measurement. Among them, the DIC strain measurement system has gradually become one of the methods for measuring the dynamic strain field parameters of key components of liquid rocket engine hot test due to its outstanding advantages such as simple equipment, full-field measurement, wide applicability and high accuracy. However, since most components are in a high temperature-vibration-explosion risk coupling environment during the hot test, this harsh and complex environment poses a huge challenge to the applicability of the DIC strain measurement system.

[0004] The existing DIC strain measurement system cannot meet the measurement requirements of the engine hot test strain field. Therefore, it is necessary to develop a comprehensive thermal-vibration-explosion protection device for the DIC strain measurement system based on the engine hot test site environment. This is of vital importance to the widespread application of the DIC strain measurement system in rocket engine hot testing. Summary of the invention

[0005] In view of the above problems, the present invention aims to provide a protection device for an engine hot test DIC strain measurement system and a method for installing and using the same.

[0006] In a first aspect, a protective device for an engine hot test DIC strain measurement system is provided, comprising a protective cover assembly, a posture adjustment assembly and a bracket assembly;

[0007] The protective cover assembly is provided with a closed space, and the closed space is used to install a DIC image acquisition camera; the side wall of the protective cover assembly is provided with a high temperature resistant transparent window plate and a heat insulation layer;

[0008] The posture adjustment assembly comprises a pitch posture adjustment platform and a horizontal posture adjustment seat, the protective cover assembly is connected to the pitch posture adjustment platform, and the pitch posture adjustment platform is rotatably connected to the horizontal posture adjustment seat;

[0009] The bracket assembly includes a support frame and a position adjustment plate, wherein the position adjustment plate is movably connected to the support frame; the horizontal posture adjustment seat is rotatably connected to the position adjustment plate, and a first vibration damping member is arranged between the horizontal posture adjustment seat and the position adjustment plate.

[0010] Furthermore, the protective cover assembly is configured as a rectangular box including a bottom plate, a top plate, a front plate, a rear plate, a left double-layer plywood and a right double-layer plywood; the heat insulation layer is arranged in the interlayer of the left double-layer plywood and the right double-layer plywood.

[0011] Furthermore, a camera support plate is arranged in the protective cover assembly, and the camera support plate, the bottom plate of the protective cover assembly and the pitch adjustment platform are connected; a second vibration damping member is arranged between the camera support plate and the bottom plate.

[0012] Furthermore, the pitch attitude adjustment platform and the horizontal attitude adjustment seat are both provided with a first center hole and a circular array hole, the circular array hole is configured as a plurality of internal threaded holes, and is arranged in a circular ring with the first center hole as the center; the pitch attitude adjustment platform and the horizontal attitude adjustment seat are connected via a first center bolt disposed in the first center hole and a pitch fixing bolt disposed in the circular array hole.

[0013] Furthermore, the horizontal posture adjustment seat and the position adjustment plate both have a second center hole, the horizontal posture adjustment seat has an arc-shaped waist-shaped hole, and the second center hole is arranged at the center position of the waist-shaped hole; the position adjustment plate has a horizontal fixing screw hole; the horizontal posture adjustment seat and the position adjustment plate are connected by a second center bolt arranged in the second center hole and a horizontal fixing bolt arranged in the waist-shaped hole and the horizontal fixing screw hole.

[0014] Furthermore, the support frame includes four legs, the position adjustment plate has four rectangularly distributed through-holes, and one leg is arranged in each of the through-holes; the outer wall of each leg is provided with an external thread, and is respectively screwed with a lower adjusting nut and an upper adjusting nut; the lower adjusting nut and the upper adjusting nut are respectively arranged under and above the position adjustment plate.

[0015] Furthermore, the number of the position adjustment plates is at least two, and the plurality of position adjustment plates are arranged from top to bottom.

[0016] Furthermore, a base is provided at the bottom of the supporting leg, an internal threaded hole is provided in the base, and the bottom end of the supporting leg is screwed into the internal threaded hole.

[0017] In a second aspect, a method for installing a protective device for a DIC strain measurement system during an engine hot test as described in the above technical solution is provided, comprising the following steps:

[0018] Assembling the support assembly: selecting a measurement site, placing the support frame, and movably connecting the position adjustment plate to the support frame; leveling the position adjustment plate according to the terrain of the measurement site so that the position adjustment plate is in a horizontal state;

[0019] Assemble the posture adjustment assembly: rotatably connect the horizontal posture adjustment seat to the position adjustment plate, and rotatably connect the pitch posture adjustment platform to the horizontal posture adjustment seat;

[0020] Assembling the protective cover assembly: installing the DIC image acquisition camera into the enclosed space of the protective cover assembly, and making the lens of the DIC image acquisition camera face the high temperature resistant transparent window plate (16); connecting the protective cover assembly to the pitch adjustment platform.

[0021] In a third aspect, a method for using the engine hot test DIC strain measurement system protection device as described in the above technical solution is provided, comprising the following steps:

[0022] Adjusting the position of the measured object: according to the position of the measured object, the position adjustment plate is lifted and lowered along the support frame, and then the height position of the position adjustment plate is fixed;

[0023] Adjusting the image field of view: rotating the horizontal posture adjustment seat horizontally, driving the pitch posture adjustment platform and the protective cover assembly to rotate horizontally, realizing horizontal angle adjustment of image acquisition, and then fixing the horizontal angle position of the horizontal posture adjustment seat;

[0024] The pitch adjustment platform is rotated in pitch to drive the protective cover assembly to rotate in pitch, so as to adjust the pitch angle of image acquisition, and then the pitch angle position of the pitch adjustment platform is fixed.

[0025] The embodiments of the present invention have the following advantages or beneficial effects:

[0026] 1. The present invention provides a protection device for a DIC strain measurement system of an engine hot test and a method for installing and using the device, which can solve the safety protection problem of a DIC image acquisition system in a high temperature-vibration-explosion risk coupling environment of a rocket engine hot test, and overcome the defect that the existing DIC strain measurement system cannot meet the measurement task of the strain field of the engine hot test; a DIC image acquisition camera is installed through the enclosed space of a protective cover assembly, and a heat insulation layer and a high temperature resistant transparent window plate are provided on the side wall of the enclosed space for heat protection, so as to avoid the DIC image acquisition camera from heating up due to environmental radiation, thereby avoiding affecting the image acquisition effect; the DIC image acquisition camera is connected to the surrounding environment through the enclosed space. The sealing of the environment physically eliminates the risk of explosion caused by contact between electrical components and combustible gases, thereby improving the safety of the DIC measurement system; the vibration-damping material is arranged between the horizontal posture adjustment seat and the upper movable position adjustment plate, which can achieve a comprehensive protection effect against heat-vibration-explosion environment; the image acquisition height can be adjusted by adjusting the height of the position adjustment plate; the horizontal angle of image acquisition can be adjusted by adjusting the horizontal angle position of the horizontal posture adjustment seat in the left and right directions; the pitch angle of image acquisition can be adjusted by adjusting the pitch angle position of the pitch adjustment table in the up and down directions, thereby having a wider range of DIC image acquisition flexibility and greatly improving the environmental adaptability of the DIC strain measurement system.

[0027] 2. The present invention provides a protective device for an engine hot test DIC strain measurement system and a method for installing and using the device. A sealing ring is arranged between the top plate of the protective cover assembly and the top of the lower open part thereof to ensure the sealing performance of the enclosed space, which is conducive to achieving complete sealing of the DIC image acquisition camera and the surrounding environment.

[0028] 3. The present invention provides a protective device for an engine hot test DIC strain measurement system and an installation and use method thereof. A camera support plate is arranged in the protective cover assembly, and the camera support plate is used to install a DIC image acquisition camera. A second vibration damping member is arranged between the camera support plate and the bottom plate. The second vibration damping member is combined with the first vibration damping member to form a double vibration damping structure, which can more effectively reduce the influence of environmental vibration on image acquisition, and is more conducive to achieving the comprehensive protection effect of the device against the heat-vibration-explosion environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0030] Figure 1 It is a first-person structural diagram of a DIC strain measurement system protection device for an engine hot test.

[0031] Figure 2 The diagram is a second-view structural diagram of a protection device for a DIC strain measurement system during an engine hot test.

[0032] Figure 3 It is a structural explosion diagram of the protection device of the DIC strain measurement system of the engine hot test.

[0033] Figure 4 It is a front view of the protective device of the DIC strain measurement system of the engine hot test.

[0034] Figure 5 It is a rear view of the protective device of the DIC strain measurement system of the engine hot test.

[0035] Figure 6 It is a left view of the protective device of the DIC strain measurement system of the engine hot test.

[0036] Figure 7 A top view of the DIC strain measurement system protection device for an engine hot test.

[0037] Figure 8 A bottom view of a DIC strain measurement system guard for an engine hot test.

[0038] Fig. 9 The diagram is a top view of a protective cover assembly of a DIC strain measurement system protection device for an engine hot test.

[0039] Fig.10 yes Fig. 9 AA section view.

[0040] Fig.11 yes Fig. 9 Middle BB section view.

[0041] Fig.12 The present invention is a perspective view of the internal structure of a protective cover assembly of a DIC strain measurement system protection device for an engine hot test.

[0042] Fig.13 The present invention is a flow chart of the installation method of the protection device of the DIC strain measurement system of the engine hot test.

[0043] Fig.14 The present invention is a flow chart of the method of using the protection device of the DIC strain measurement system of the engine hot test.

[0044] The reference numerals are described as follows:

[0045] 1. Support frame, 2. Camera support plate, 3. Protective cover assembly, 4. Pitch adjustment platform, 401. First center hole, 402. Circular array hole, 403. First center bolt, 404. Pitch fixing bolt, 5. Upper locking nut, 6. Position adjustment plate, 7. Lower locking nut, 8. Bottom plate, 9. Top plate, 10. Back plate, 11. Threading hole, 12. Connecting bolt, 13. Column, 14. Base, 15. Horizontal adjustment seat, 151. Second center hole, 152. Waist-shaped hole, 153. Horizontal fixing screw hole, 154. Second center bolt, 16. High temperature resistant transparent window plate. DETAILED DESCRIPTION

[0046] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0047] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0048] Figure 1 It is a first-person structural diagram of a protection device for a DIC strain measurement system during an engine hot test; Figure 2 It is a second-view structural diagram of a protection device for a DIC strain measurement system during an engine hot test; Figure 3 It is a structural explosion diagram of the protection device of the DIC strain measurement system of the engine hot test;

[0049] Figure 4 It is a front view of the protection device of the DIC strain measurement system of the engine hot test; Figure 5 It is a rear view of the DIC strain measurement system guard for an engine hot test; Figure 6 It is a left view of the protection device of the DIC strain measurement system of the engine hot test; Figure 7 It is a top view of the protection device of the DIC strain measurement system of the engine hot test; Figure 8 It is a bottom view of the protection device of the DIC strain measurement system of the engine hot test; Fig. 9 It is a top view of the protective cover assembly of the DIC strain measurement system protection device for engine hot test; Fig.10 yes Fig. 9 Middle AA section view; Fig.11 yes Fig. 9 Middle BB section view; Fig.12 This is a perspective view of the internal structure of the protective cover assembly of the engine hot test DIC strain measurement system protection device. The upper and lower directions refer to Figures 1 to 6 , Figures 10 to 12 The up and down directions, left and right directions shown in Figure 4 , Figure 5 , Figures 7 to 9 The left and right directions shown in the figure, and the front and rear directions refer to Figure 6 The above diagram is not the actual scale of the actual product.

[0050] Embodiment 1

[0051] Please refer to Figures 1 to 9 , an engine hot test DIC strain measurement system protection device according to an embodiment of the present invention comprises a protection cover assembly 3, a posture adjustment assembly and a bracket assembly;

[0052] The protective cover component 3 is provided with a closed space, and the closed space is used to install the DIC image acquisition camera; the side wall of the protective cover component 3 is provided with a high temperature resistant transparent window plate 16 and a heat insulation layer;

[0053] Among them, the protective cover assembly 3 is used to enclose the DIC image acquisition camera in its enclosed space to prevent flammable and explosive gases from directly contacting the DIC image acquisition camera, thereby preventing explosion accidents caused by the electrical components of the DIC image acquisition camera and improving the safety of the DIC measurement system. When the DIC image acquisition camera is installed in the enclosed space of the protective cover assembly 3, its lens faces the high-temperature resistant transparent window plate 16 to facilitate shooting of the outside of the protective cover assembly 3. The heat insulation layer and the high-temperature resistant transparent window plate 16 are used for thermal protection to isolate the thermal radiation generated by the engine tail nozzle from the DIC image acquisition camera, so as to avoid the DIC image acquisition camera from being affected by the temperature rise of environmental radiation. The high-temperature resistant transparent window plate 16 can adopt the high-temperature resistant organic glass plate of the prior art.

[0054] The posture adjustment assembly includes a pitch posture adjustment platform 4 and a horizontal posture adjustment seat 15, the protective cover assembly 3 is connected to the pitch posture adjustment platform 4, and the pitch posture adjustment platform 4 is rotatably connected to the horizontal posture adjustment seat 15;

[0055] The pitch adjustment platform 4 is used to drive the protective cover assembly 3 and the DIC image acquisition camera installed therein to rotate in the pitch direction, so as to adjust the pitch angle of the DIC image acquisition camera. The horizontal adjustment seat 15 is used to drive the pitch adjustment platform 4, the protective cover assembly 3 and the DIC image acquisition camera installed therein to rotate in the horizontal direction, so as to adjust the horizontal angle of the DIC image acquisition camera.

[0056] The bracket assembly includes a support frame 1 and a position adjustment plate 6, which is movably connected to the support frame leg 1; a horizontal posture adjustment seat 15 is rotatably connected to the position adjustment plate 6, and a first vibration damping member is arranged between the horizontal posture adjustment seat 15 and the position adjustment plate 6.

[0057] The support frame 1 is used to support the protection device of the DIC strain measurement system of the engine hot test as a whole. The position adjustment plate 6 is movably connected to the support frame 1 in a lifting manner, and is used to drive the horizontal posture adjustment seat 15, the pitch posture adjustment platform 4, the protective cover assembly 3 and the DIC image acquisition camera installed therein to lift and move, so as to achieve the height position adjustment of the DIC image acquisition camera. The first vibration reduction member is in contact with both the horizontal posture adjustment seat 15 and the position adjustment plate 6, which can reduce the influence of environmental vibration on the image acquisition of the DIC image acquisition camera.

[0058] Please refer to Figures 1 to 12 In one embodiment, the protective cover assembly 3 is configured as a rectangular box including a bottom plate 8, a top plate 9, a front plate, a rear plate 10, a left double-layer plywood and a right double-layer plywood; the heat insulation layer is arranged in the interlayer of the left double-layer plywood and the right double-layer plywood.

[0059] The protective cover assembly 3 is configured as a rectangular box, which is convenient for processing and installation, and its interior is convenient for forming a closed space. The left double-layer plywood and the right double-layer plywood of the protective cover assembly 3 are both provided with a cavity-type interlayer, which is convenient for embedding a heat insulation layer in the interlayer. The heat insulation layer is made of heat insulation asbestos.

[0060] Specifically, a high temperature resistant transparent window plate 16 is arranged on the front plate. A threading hole 11 is provided on the rear plate 10 for passing the line of the DIC image acquisition camera. A sealing ring is arranged on the inner wall of the threading hole 11 to improve the sealing performance of the protective cover assembly 3 at the threading hole 11.

[0061] The bottom plate 8, the front plate, the rear plate 10, the left double-layer plywood and the right double-layer plywood form an open portion of a rectangular box body of the protective cover assembly 3, the top plate 9 is connected to the top of the open portion to form a covering structure, and a sealing ring is arranged between the top plate 9 and the top of the open portion to ensure the sealing performance of the enclosed space.

[0062] The four corners of the enclosed space of the protective cover assembly 3 are respectively provided with upright posts 13 , and the top and bottom ends of the upright posts 13 are respectively connected to the top plate 9 and the bottom plate 8 by bolts to reinforce the structure of the protective cover assembly 3 .

[0063] Please refer to Figures 10 to 12 In one embodiment, a camera support plate 2 is disposed in the protective cover assembly 3, and the camera support plate 2, the bottom plate 8 of the protective cover assembly 3 and the pitch adjustment platform 4 are connected; a second vibration damping member is disposed between the camera support plate 2 and the bottom plate 8.

[0064] The camera support plate 2 is used to install the DIC image acquisition camera, which is convenient for installing the camera support plate 2 in the enclosed space of the protective cover assembly 3. The camera support plate 2, the bottom plate 8 of the protective cover assembly 3 and the pitch adjustment table 4 are connected, which can also strengthen the firmness of the connection structure between the protective cover assembly 3 and the pitch adjustment table 4, and improve the stability of the DIC image acquisition camera installed in the protective cover assembly 3. The second vibration member is combined with the first vibration reduction member to form a double vibration reduction structure, which further reduces the influence of environmental vibration on image acquisition. The first vibration reduction member and the second vibration reduction member can use vibration reduction materials to form a vibration reduction layer.

[0065] The first vibration damping member and the second vibration damping member may both be rubber vibration damping layers.

[0066] Specifically, the camera support plate 2 is configured as a right-angled "X"-shaped plate, the raised top surface of the camera support plate 2 is used to install the DIC image acquisition camera, and the edge portions on both sides are connected to the bottom plate 8 of the protective cover assembly 3 through connecting bolts 12.

[0067] The second vibration-damping member is disposed between the edge portions of both sides of the camera support plate 2 and the bottom plate 8 , and is in contact with both of them, thereby playing a vibration-damping role.

[0068] Please refer to Figures 1 to 3 and Figure 6 In one embodiment, the pitch attitude adjustment platform 4 and the horizontal attitude adjustment seat 15 both have a first center hole 401 and a circular array hole 402, the circular array hole 402 is configured as a plurality of internal threaded holes, and is arranged in a circular ring with the first center hole 401 as the center; the pitch attitude adjustment platform 4 and the horizontal attitude adjustment seat 15 are connected via a first center bolt 403 disposed in the first center hole 401 and a pitch fixing bolt 404 disposed in the circular array hole 402.

[0069] When the pitch adjustment platform 4 needs to be adjusted in pitch rotation, the pitch fixing bolt 404 is loosened, the pitch adjustment platform 4 is pitched and rotated, and then the pitch fixing bolt 404 is tightened in the circular array hole 402 to adjust and fix the pitch angle.

[0070] Specifically, the first center hole 401 is configured as a horizontal light hole, and the first center bolt 403 is configured as a bolt. The end of the first center bolt 403 passes through the first center hole 401 and is screwed to the first nut.

[0071] When the pitch attitude adjustment platform 4 needs to be fixed, the first nut and the pitch fixing bolt 404 are tightened. When the pitch attitude adjustment platform 4 needs to be rotated, the first nut and the pitch fixing bolt 404 are loosened.

[0072] Please refer to Figures 1 to 3 and Figure 6In one embodiment, the horizontal posture adjustment seat 15 and the position adjustment plate 6 both have a second center hole 151, the horizontal posture adjustment seat 15 has an arc-shaped waist-shaped hole 152, and the second center hole 151 is set at the center position of the waist-shaped hole 152; the position adjustment plate 6 has a horizontal fixing screw hole 153; the horizontal posture adjustment seat 15 and the position adjustment plate 6 are connected by a second center bolt 154 set in the second center hole 151 and a horizontal fixing bolt set in the waist-shaped hole 152 and the horizontal fixing screw hole 153.

[0073] When the horizontal posture adjustment seat 15 needs to be adjusted by horizontal rotation, the horizontal fixing bolt is loosened, the horizontal posture adjustment seat 15 is horizontally rotated, and then the horizontal fixing bolt is tightened in the waist-shaped hole 152 and the horizontal fixing screw hole 153 to achieve horizontal angle adjustment and fixation.

[0074] Specifically, the second center hole 151 is configured as a vertical light hole, and the second center bolt 154 is configured as a bolt. The end of the second center bolt 154 passes through the second center hole 151 and is screwed to the second nut.

[0075] When the horizontal posture adjustment seat 15 needs to be fixed, the second nut and the horizontal fixing bolt are tightened. When the pitch posture adjustment platform 4 needs to be rotated, the second nut and the horizontal fixing bolt are loosened.

[0076] Specifically, the pitch adjustment platform 4 includes a pitch top plate 9 and first vertical plates on both sides, and the first vertical plates on both sides are respectively connected to the two side positions below the pitch top plate 9, so that the pitch adjustment platform 4 forms an inverted U-shaped structure bent at a right angle. The pitch top plate 9 is set to a rectangular shape. The pitch top plate 9 contacts the bottom plate 8 of the protective cover assembly 3 and is connected by connecting bolts 12.

[0077] The horizontal posture adjustment seat 15 includes a horizontal bottom plate and second vertical plates on both sides, and the second vertical plates on both sides are respectively connected to the two sides of the horizontal bottom plate, so that the horizontal posture adjustment seat 15 forms a U-shaped structure with a right angle bend. The first vertical plate and the second vertical plate are both provided with a first center hole 401 and a circular array hole 402. The two second vertical plates are arranged between the two first vertical plates. The first vertical plates and the second vertical plates on both sides are in contact with each other and are connected by a first center bolt 403 and a pitch fixing bolt 404.

[0078] The bottom edge of the first vertical plate and the top edge of the second vertical plate are both arranged as raised arc edges to avoid damage.

[0079] The horizontal bottom plate is set to be circular. The horizontal bottom plate is provided with a second center hole 151 and a waist-shaped hole 152. The waist-shaped hole 152 and the horizontal fixing screw hole 153 are both set to two, and the two waist-shaped holes 152 and the two horizontal fixing screw holes 153 are respectively arranged symmetrically with the second center hole 151 as the symmetry center. The horizontal bottom plate contacts the position adjustment plate 6 and is connected by the second center bolt 154 and the horizontal fixing bolt.

[0080] Please refer to Figures 1 to 7 In one embodiment, the support frame 1 includes four legs, and the position adjustment plate 6 has four rectangularly distributed through holes, each of which is provided with a leg; the outer wall of each leg is provided with an external thread, and is respectively screwed with a lower locking nut 5 and an upper locking nut 7; the lower locking nut 5 and the upper locking nut 7 are respectively arranged at the bottom and the top of the position adjustment plate 6.

[0081] When the position adjustment plate 6 moves up and down along the legs through the perforations, the position adjustment plate 6 can be lifted and lowered, thereby achieving height adjustment of the DIC image acquisition camera. By rotating the lower locking nut 5 and the upper locking nut 7 so that the two contact the top surface and the bottom surface of the position adjustment plate 6 respectively, the height position of the position adjustment plate 6 can be fixed, thereby achieving height fixing of the DIC image acquisition camera.

[0082] Please refer to Figures 1 to 6 In one embodiment, at least two position adjustment plates 6 are provided, and the plurality of position adjustment plates 6 are arranged from top to bottom.

[0083] Among them, a position adjustment plate 6 that best suits the height position range of the DIC image acquisition camera can be selected from multiple position adjustment plates 6, and a posture adjustment component and a protective cover component 3 can be installed on the position adjustment plate 6 to improve the shooting height position adjustment efficiency and expand the shooting height position adjustment range.

[0084] For example, three position adjustment plates 6 are provided.

[0085] Please refer to Figures 1 to 6 and Figure 8 In one embodiment, a base 14 is provided at the bottom of the leg, an internal threaded hole is provided in the base 14, and the bottom end of the leg is screwed into the internal threaded hole.

[0086] By rotating each base 14, the height position of each base 14 can be adjusted along the legs, so that the height position of the bottom end of each leg 1 can be adjusted to adapt to the ground with different flatness.

[0087] Embodiment 2

[0088] like Fig.13 As shown, a method for installing a protective device of a DIC strain measurement system for an engine hot test as in Embodiment 1 of the present invention comprises the following steps:

[0089] Step S11, assembling the bracket assembly: selecting a measurement site, placing a support frame, and movably connecting the position adjustment plate 6 to the support frame; leveling the position adjustment plate 6 according to the terrain of the measurement site so that the position adjustment plate 6 is in a horizontal state;

[0090] Step S12, assembling the posture adjustment assembly: rotating the horizontal posture adjustment seat 15 to be connected to the position adjustment plate 6, and rotating the pitch posture adjustment platform 4 to be connected to the horizontal posture adjustment seat 15;

[0091] Step S13, assembling the protective cover assembly: installing the DIC image acquisition camera into the enclosed space of the protective cover assembly 3, and making the lens of the DIC image acquisition camera face the high temperature resistant transparent window plate 16; connecting the protective cover assembly 3 to the pitch adjustment platform 4.

[0092] Specifically, when assembling the bracket assembly, first screw the lower adjusting nuts 5 onto the four legs respectively, then extend the four legs into the four through holes of the position adjustment plate 6 respectively, and then screw the upper adjusting nuts 7 onto the four legs 1 respectively, so that the bottom surface and the top surface of the position adjustment plate 6 respectively contact the lower adjusting nut 5 and the upper adjusting nut 7, thereby connecting the position adjustment plate 6 to the four legs; and connect the upper, middle and lower position adjustment plates 6 to the four legs in sequence; then rotate the base 14 at the desired position according to the terrain of the measurement site, so that when the bottom surfaces of the four bases 14 contact the ground of the measurement site, the position adjustment plate 6 is in a horizontal state.

[0093] When assembling the posture adjustment component, place the horizontal base plate on one of the position adjustment plates 6, connect the second center bolt 154 to the second center hole 151 of the horizontal posture adjustment seat 15 and the position adjustment plate 6, and tighten the second nut; set the horizontal adjustment bolt in the waist hole 152 and the horizontal fixing screw hole 153 to connect the horizontal posture adjustment seat 15 to the position adjustment plate 6;

[0094] The two first vertical plates of the pitch attitude adjustment platform 4 are connected to the two second vertical plates of the horizontal attitude adjustment seat 15 through the first center bolt 403 set in the first center hole 401 and the pitch fixing bolt 404 set in the circular array hole 402, and the first nut is tightened on the first center bolt 403 to connect the pitch attitude adjustment platform 4 to the horizontal attitude adjustment seat 15.

[0095] When assembling the protective cover assembly, the left double-layer plywood and the right double-layer plywood are welded to the left and right sides of the bottom plate 8 respectively, and the front plate and the rear plate 10 are connected to the front and rear sides of the left double-layer plywood, the right double-layer plywood and the bottom plate 8 respectively by bolts; then the camera support plate 2, the bottom plate 8 and the pitch top plate 9 are connected by connecting bolts 12, and the DIC image acquisition camera is installed on the support plate 2; and then the top plate 9 is connected to the top of the front plate, the rear plate 10, the left double-layer plywood and the right double-layer plywood by bolts.

[0096] Embodiment 3

[0097] like Fig.14 As shown, a method for using a protective device for a DIC strain measurement system of an engine hot test as in Embodiment 1 of the present invention comprises the following steps:

[0098] Step S21, adjusting the position of the measurement object: according to the position of the measurement object, the position adjustment plate 6 is lifted and lowered along the support frame 1, and then the height position of the position adjustment plate 6 is fixed;

[0099] Step S22, adjusting the image field of view: rotating the horizontal posture adjustment seat 15 horizontally, driving the pitch posture adjustment platform 4 and the protective cover assembly 3 to rotate horizontally, so as to adjust the horizontal angle of image acquisition, and then fixing the horizontal angle position of the horizontal posture adjustment seat 15;

[0100] The pitch adjustment platform 4 is rotated in pitch to drive the protective cover assembly 3 to rotate in pitch, so as to adjust the pitch angle of image acquisition, and then the pitch angle position of the pitch adjustment platform 4 is fixed.

[0101] Specifically, when adjusting the position of the measured object, the four lower adjusting nuts 5 below the position adjusting plate 6 are rotated to move it downward along the legs, or the four upper adjusting nuts 7 above the position adjusting plate 6 are rotated to move it upward along the legs, and the position adjusting plate 6 is moved downward or upward along the legs to drive the DIC image acquisition camera to move downward or upward to a desired height position; then the four lower adjusting nuts 5 and the four upper adjusting nuts 7 are rotated and tightened to contact the fixed position adjusting plate 6 respectively.

[0102] When adjusting the image field of view and the horizontal angle of image acquisition, loosen the second nut and the horizontal fixing bolt on the second center bolt 154 so that the horizontal posture adjustment seat 15 is separated from the fixed connection with the position adjustment plate 6; then rotate the horizontal posture adjustment seat 15 in the horizontal direction to achieve horizontal angle adjustment; thereafter, tighten the second nut and the horizontal fixing bolt to fix the horizontal posture adjustment seat 15 to the position adjustment plate 6, thereby fixing the horizontal angle position of the horizontal posture adjustment seat 15.

[0103] When adjusting the pitch angle of image acquisition, loosen the first nut and the pitch fixing bolt 404 on the first center bolt 403, and then rotate the pitch adjustment platform 4 in the pitch direction to achieve pitch angle adjustment; thereafter, tighten the first nut and the pitch fixing bolt 404 to achieve a fixed connection between the pitch adjustment platform 4 and the horizontal attitude adjustment seat 15, thereby fixing the pitch angle position of the pitch adjustment platform 4.

[0104] In the embodiments of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0105] In the description of the embodiments of the present invention, it needs to be understood that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0106] In the description of this specification, the description of the terms "one embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A protection device for a DIC strain measurement system for an engine hot test, characterized in that: It includes a protective cover assembly, a posture adjustment assembly and a bracket assembly; The protective cover assembly is provided with a closed space, and the closed space is used to install a DIC image acquisition camera; the side wall of the protective cover assembly is provided with a high temperature resistant transparent window plate and a heat insulation layer; The posture adjustment assembly comprises a pitch posture adjustment platform and a horizontal posture adjustment seat, the protective cover assembly is connected to the pitch posture adjustment platform, and the pitch posture adjustment platform is rotatably connected to the horizontal posture adjustment seat; The bracket assembly includes a support frame and a position adjustment plate, wherein the position adjustment plate is movably connected to the support frame; the horizontal posture adjustment seat is rotatably connected to the position adjustment plate, and a first vibration damping member is arranged between the horizontal posture adjustment seat and the position adjustment plate.

2. The engine hot test DIC strain measurement system protection device according to claim 1, characterized in that: The protective cover assembly is configured as a rectangular box body including a bottom plate, a top plate, a front plate, a rear plate, a left double-layer plywood and a right double-layer plywood; the heat insulation layer is arranged in the interlayer of the left double-layer plywood and the right double-layer plywood.

3. The engine hot test DIC strain measurement system protection device according to claim 2, characterized in that: A camera support plate is arranged in the protective cover assembly, and the camera support plate, the bottom plate of the protective cover assembly and the pitch adjustment platform are connected; a second vibration damping member is arranged between the camera support plate and the bottom plate.

4. The engine hot test DIC strain measurement system protection device according to claim 1, characterized in that: The pitch attitude adjustment platform and the horizontal attitude adjustment seat are both provided with a first center hole and a circular array hole, the circular array hole is configured as a plurality of internal threaded holes and is arranged in a circular ring with the first center hole as the center; the pitch attitude adjustment platform and the horizontal attitude adjustment seat are connected via a first center bolt arranged in the first center hole and a pitch fixing bolt arranged in the circular array hole.

5. The engine hot test DIC strain measurement system protection device according to claim 1, characterized in that: The horizontal posture adjustment seat and the position adjustment plate both have a second center hole, the horizontal posture adjustment seat has an arc-shaped waist-shaped hole, and the second center hole is arranged at the center position of the waist-shaped hole; the position adjustment plate has a horizontal fixing screw hole; the horizontal posture adjustment seat and the position adjustment plate are connected by a second center bolt arranged in the second center hole and a horizontal fixing bolt arranged in the waist-shaped hole and the horizontal fixing screw hole.

6. The engine hot test DIC strain measurement system protection device according to claim 1, characterized in that: The support frame includes four legs, the position adjustment plate has four rectangularly distributed through holes, and one leg is arranged in each through hole; the outer wall of each leg is provided with an external thread, and is respectively screwed with a lower locking nut and an upper locking nut; the lower locking nut and the upper locking nut are respectively arranged under and above the position adjustment plate.

7. The engine hot test DIC strain measurement system protection device according to claim 6, characterized in that: The number of the position adjustment plates is at least two, and the plurality of position adjustment plates are arranged from top to bottom.

8. The engine hot test DIC strain measurement system protection device according to claim 6, characterized in that: A base is arranged at the bottom of the supporting leg, an internal threaded hole is provided in the base, and the bottom end of the supporting leg is screwed into the internal threaded hole.

9. The method for installing a protective device for a DIC strain measurement system for a hot test of an engine according to any one of claims 1 to 8, characterized in that: The following steps are involved: Assembling the support assembly: selecting a measurement site, placing the support frame, and movably connecting the position adjustment plate to the support frame; leveling the position adjustment plate according to the terrain of the measurement site so that the position adjustment plate is in a horizontal state; Assemble the posture adjustment assembly: rotatably connect the horizontal posture adjustment seat to the position adjustment plate, and rotatably connect the pitch posture adjustment platform to the horizontal posture adjustment seat; Assemble the protective cover assembly: install the DIC image acquisition camera into the enclosed space of the protective cover assembly, and make the lens of the DIC image acquisition camera face the high-temperature resistant transparent window plate; connect the protective cover assembly to the pitch adjustment platform.

10. The method for using the engine hot test DIC strain measurement system protection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Adjusting the position of the measured object: according to the position of the measured object, the position adjustment plate is lifted and lowered along the support frame, and then the height position of the position adjustment plate is fixed; Adjusting the image field of view: rotating the horizontal posture adjustment seat horizontally, driving the pitch posture adjustment platform and the protective cover assembly to rotate horizontally, realizing horizontal angle adjustment of image acquisition, and then fixing the horizontal angle position of the horizontal posture adjustment seat; The pitch adjustment platform is rotated in pitch to drive the protective cover assembly to rotate in pitch, so as to adjust the pitch angle of image acquisition, and then the pitch angle position of the pitch adjustment platform is fixed.

Images