A device for removing a flat plate model in a supersonic rectangular turbulent duct

Abstract

The present invention relates to the technical field of mechanical equipment. A device for removing a flat plate model in a supersonic rectangular turbulent duct comprises a hydraulic mechanism, an expansion part, a supporting bracket and a support part; the hydraulic mechanism is hinged to the ends of two oppositely arranged supporting brackets, and the telescopic end of the hydraulic mechanism is connected to the expansion part; the expansion part is arranged between the two supporting brackets, wherein after the telescopic end of the hydraulic mechanism is retracted into the hydraulic mechanism, the expansion part is arranged at the connecting end of the two supporting brackets and the hydraulic mechanism; after the telescopic end of the hydraulic mechanism is extended, the expansion part is arranged in the middle of the two supporting brackets; the end of the supporting bracket away from the hydraulic mechanism is hinged to the support part. The present invention solves the problems of low efficiency, complicated operation and damage to the surface morphology of the model caused by the need to use a crowbar, a cutter, etc. in the existing method for removing a flat plate model in a turbulent duct during operation, and has the advantages of simple structure, convenient operation and no damage to the surface morphology of the test model.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment, and in particular to a device for removing a flat plate model in a supersonic rectangular turbulent duct, in particular to a tool for removing a flat plate model in a turbulent duct. Background Art

[0002] There are inevitably some protrusions or gaps on the surface of any high-speed aircraft, such as window steps. When flying at high Mach numbers, the separation and subsequent reattachment of the airflow around them may produce shock wave-boundary layer interference, causing local overheating and ablation, and even burning through the heat protection layer and damage to the warhead. In ground tests, supersonic turbulent flat plate ablation test technology is often used to study the ablation heat protection of local areas. During the test, the flat plate model is installed in a rectangular turbulent duct to make it a side wall of the duct. In order to ensure the airtightness of the device, high-temperature glue is often used to repair the gap. During the test, the high-temperature aerodynamic thermal environment will not only cause the model to expand and increase its volume, but also cause the high-temperature glue to cure quickly, firmly bonding the model to the side wall of the duct. Therefore, it is difficult to remove the model after the test.

[0003] The common method of removing the model is to first cut the high-temperature glue between the model and the inner wall of the catheter with a blade, and then use a flat-headed pry bar or other tool to reach inward from the outlet of the catheter and pry the model out with force. Due to the expansion of the model, the gap between the model and the inner wall of the catheter is already very small, and the blade is often unable to reach in; in addition, the curing of the high-temperature glue makes the adhesion between the model and the inner wall of the catheter very strong. When the pry bar pries up the model, one end of the pry bar will act on the surface of the model, which will inevitably damage the morphology of the model after ablation, causing interference to the subsequent experimental analysis. Summary of the invention

[0004] The purpose of the present invention is to provide a device for removing a flat plate model in a supersonic turbulent duct. The device for removing a flat plate model in a supersonic turbulent duct can overcome the problems of complex operation, long time consumption, low efficiency and ablation morphology destruction of the model surface due to the action of force in the existing process of removing the flat plate model in a turbulent duct.

[0005] The present invention provides a device for removing a flat plate model in a supersonic rectangular turbulent duct, which is characterized by comprising a hydraulic mechanism, an expansion part, a supporting bracket and a support part; the hydraulic mechanism is hinged to the ends of two oppositely arranged supporting brackets, and the telescopic end of the hydraulic mechanism is connected with the expansion part; the expansion part is arranged between the two supporting brackets, and when the telescopic end of the hydraulic mechanism is extended, the expansion part squeezes the two supporting brackets, and the two supporting brackets move away from each other; the end of the supporting bracket away from the hydraulic mechanism is hinged with the support part.

[0006] Among them, the hydraulic mechanism includes: a hand-held handle, a pressure relief nut, a hydraulic cylinder, a hydraulic support, a pressure rod piston, and a hydraulic rod; the hand-held handle is arranged at one end of the hydraulic cylinder, and the other end of the hydraulic cylinder is the telescopic end; the side wall of the hydraulic cylinder is provided with a pressure relief nut, a pressure rod piston, and a hydraulic support, and the hydraulic support is hinged to the hydraulic rod, and the pressure rod piston is connected to the hydraulic rod.

[0007] Among them, the hydraulic support and the pressure rod piston are arranged adjacent to each other.

[0008] Among them, the expansion part is a conical expansion head; the conical end of the expansion part is connected to the side adjacent to the two support brackets.

[0009] Among them, the support bracket includes a lower support bracket and an upper support bracket; the ends of the lower support bracket and the upper support bracket close to the hydraulic mechanism are arranged at intervals, and the interval distance is the outer diameter distance of the expansion part; the middle parts of the lower support bracket and the upper support bracket overlap, and the interval distance from the ends of the lower support bracket and the upper support bracket close to the hydraulic mechanism to the middle gradually becomes smaller.

[0010] Among them, the upper support bracket is provided with a slot; when the middle parts of the lower support bracket and the upper support bracket overlap, the middle part of the lower support bracket and the end provided with the support part are arranged in the slot.

[0011] Among them, the support part includes a lower support plate and an upper support plate; both the lower support plate and the upper support plate are in a C shape; the C-shaped side wall of the lower support plate is hinged to the lower support bracket; the C-shaped side wall of the upper support plate is hinged to the upper support bracket; the interval distance between the opposite walls of the slot is greater than the distance between the opposite side walls of the lower support plate.

[0012] Among them, the contact ends of the lower support plate and the upper support plate with the rectangular turbulent flow conduit are provided with grooves; a buffer layer is arranged in the grooves, and the buffer layer protrudes 3-4 mm above the surface of the upper support plate.

[0013] Advantages of the device for removing a flat plate model in a supersonic rectangular turbulent flow conduit according to the present invention:

[0014] (1) The structure of the present invention is simple and the operation is convenient. The support part is directly extended into the rectangular turbulent flow conduit, and the hydraulic device is used to generate a thrust force to easily remove the model from the rectangular turbulent flow conduit, and no additional tools are required for additional operations during the operation process.

[0015] (2) The upper support plate of the present invention adopts a U-shaped frame structure, which has a small contact area with the ablated surface of the model, but the force is uniform; in addition, soft materials can be filled in the grooves of the support plate, which can effectively reduce the damage to the surface topography of the ablated surface of the model during the operation process. Description of the Drawings

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a non-working structural diagram of a device for removing a flat plate model in a supersonic rectangular turbulent flow duct according to the present invention;

[0018] Figure 2 This is a structural diagram of the working state of a device for removing a flat plate model in a supersonic rectangular turbulent duct according to the present invention.

[0019] Description of reference numerals:

[0020] 1. Handle; 2. Pressure relief nut; 3. Hydraulic cylinder; 4. Conical expansion head; 5. Lower support bracket; 6. Lower support plate; 7. Upper support plate; 8. Upper support bracket; 9. Hydraulic support; 10. Pressure rod piston; 11. Hydraulic rod; 12. Slot; 13. Telescopic end; 14. Connecting rod. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1 and Figure 2 A device for removing a flat plate model in a supersonic rectangular turbulent duct comprises a hydraulic mechanism, an expansion part, a supporting bracket and a supporting part; the hydraulic mechanism is hinged to the ends of two oppositely arranged supporting brackets, and the telescopic end 13 of the hydraulic mechanism is connected with the expansion part; the expansion part is arranged between the two supporting brackets, wherein after the telescopic end 13 of the hydraulic mechanism is retracted into the hydraulic mechanism, the expansion part is arranged at the connecting end of the two supporting brackets and the hydraulic mechanism; after the telescopic end 13 of the hydraulic mechanism is extended, the expansion part is arranged in the middle of the two supporting brackets; the end of the supporting bracket away from the hydraulic mechanism is hinged with the supporting part.

[0025] Specifically, the hydraulic mechanism includes: a hand-held handle 1, a pressure relief nut 2, a hydraulic cylinder 3, a hydraulic support 9, a pressure rod piston 10 and a hydraulic rod 11; the hand-held handle 1 is arranged at one end of the hydraulic cylinder 3, and the other end of the hydraulic cylinder 3 is the telescopic end 13; the side wall of the hydraulic cylinder 3 is provided with a pressure relief nut 2, a pressure rod piston 10 and a hydraulic support 9, and the hydraulic support 9 is hinged to the hydraulic rod 11, and the pressure rod piston 10 is connected to the hydraulic rod 11.

[0026] The hydraulic mechanism provides power for the telescopic end 13 to extend and retract. Since the telescopic end 13 is connected with the conical expansion head 4, when the telescopic end 13 is extended and retracted, the conical expansion head 4 is also extended and retracted. When the telescopic end 13 is extended, the conical expansion head 4 is pressed against the two supporting brackets, so that the two supporting brackets are separated.

[0027] One end of the hydraulic rod 11 is hinged on the hydraulic support 9. When the hydraulic rod 11 moves back and forth from and to the hydraulic cylinder 3, the pressure rod piston 10 connected to the hydraulic rod 11 works on the hydraulic cylinder 3, so that the telescopic end 13 in the hydraulic cylinder 3 extends. When the telescopic end 13 needs to be retracted, the pressure relief nut 2 is opened to relieve the pressure on the hydraulic cylinder 3, and the telescopic end 13 is retracted.

[0028] The hand-held handle 1 is convenient for the staff to hold.

[0029] Specifically, the hydraulic support 9 and the pressure rod piston 10 are arranged adjacent to each other.

[0030] When the hydraulic rod 11 moves back and forth away from and toward the hydraulic cylinder 3 , the pressure rod piston 10 connected to the hydraulic rod 11 also moves back and forth relative to the hydraulic cylinder 3 .

[0031] Specifically, the expansion portion is a conical expansion head 4; the conical end of the expansion portion is connected to one side adjacent to the two supporting brackets.

[0032] The expansion part includes two parts, one of which has a triangular cross section and the other has a rectangular cross section; the two parts are combined into a conical expansion head 4; when the conical end is away from the hydraulic cylinder 3, a force is applied to the upper expansion frame and the lower expansion frame, so that the two expansion frames move toward each other.

[0033] Specifically, the supporting bracket includes a lower supporting bracket 5 and an upper supporting bracket 8; the lower supporting bracket 5 and the upper supporting bracket 8 are spaced apart near one end of the hydraulic mechanism, and the spacing distance is the distance of the outer diameter of the expansion part; the middle parts of the lower supporting bracket 5 and the upper supporting bracket 8 overlap, and the distance between the lower supporting bracket 5 and the upper supporting bracket 8 from one end near the hydraulic mechanism to the middle gradually decreases.

[0034] The lower supporting bracket 5 and the upper supporting bracket 8 contact the conical expansion head 4 between the end and the middle of the hydraulic mechanism, and the conical expansion head 4 applies force to the lower supporting bracket 5 and the upper supporting bracket 8. When the rectangular end of the conical expansion head 4 moves to the middle of the lower supporting bracket 5 and the upper supporting bracket 8, the distance between the lower supporting bracket 5 and the upper supporting bracket 8 reaches the maximum stroke, and then the lower supporting plate 6 and the upper supporting plate 7 respectively connected to the lower supporting bracket 5 and the upper supporting bracket 8 reach the maximum distance.

[0035] A connecting rod 14 is hingedly connected to one end of the supporting bracket close to the hydraulic mechanism; and an end of the connecting rod 14 away from the supporting bracket is fixed to the end surface of the hydraulic mechanism.

[0036] Specifically, the upper supporting bracket 8 is provided with a slot 12 ; when the middle parts of the lower supporting bracket 5 and the upper supporting bracket 8 overlap, the middle part of the lower supporting bracket 5 and one end provided with the supporting part are arranged in the slot 12 .

[0037] The presence of the slot 12 allows the lower supporting bracket 5 and the upper supporting bracket 8 to partially overlap, so that when the rectangular turbulent duct is inserted, the thickness can be smaller. The gap required for the rectangular turbulent duct is slightly larger than the thickness of the upper supporting bracket 8, so the lower supporting bracket 5 and the upper supporting bracket 8 can be inserted into the gap of the rectangular turbulent duct, and then the lower supporting bracket 5 and the upper supporting bracket 8 are stretched apart by the conical expansion head 4.

[0038] Specifically, the supporting part includes a lower support plate 6 and an upper support plate 7; both the lower support plate 6 and the upper support plate 7 are in a U shape; a lower supporting bracket 5 is hinged to the U-shaped side wall of the lower support plate 6; an upper supporting bracket 8 is hinged to the U-shaped side wall of the upper support plate 7; the distance between the opposite walls of the slot 12 is greater than the distance between the opposite side walls of the lower support plate 6.

[0039] Specifically, grooves are provided at the contact ends of the lower support plate 6 and the upper support plate 7 with the rectangular turbulent flow duct; a buffer layer is provided in the grooves, and the buffer layer protrudes 3 - 4 mm above the surface of the upper support plate 7.

[0040] The buffer layer can be made of a soft material, such as rubber.

[0041] Specifically, the lower supporting bracket 5, the upper supporting bracket 8, the lower support plate 6 and the upper support plate 7 have the same thickness, generally taking 2 / 3 - 3 / 4 of the outlet height of the rectangular turbulent flow duct is appropriate; the length and width of the upper support plate 7 are generally 1 - 2 mm smaller than those of the rectangular turbulent flow duct is appropriate.

[0042] Specifically, the lower supporting bracket 5 and the lower support plate 6, the upper support plate 7 and the upper supporting bracket 8, and the upper supporting bracket 8, the lower supporting bracket 5 and the hydraulic cylinder 3 are all connected by bolts.

[0043] Specifically, when the conical expansion head 4 is in the non-working state, the upper surfaces of the lower supporting bracket 5, the upper supporting bracket 8, the lower support plate 6 and the upper support plate 7 should be in a completely flush state.

[0044] Specifically, the depth of the groove of the upper support plate 7 generally takes 1 / 3 - 1 / 2 of the thickness of the support plate is appropriate, and the soft material filled has a height generally 3 - 4 mm higher than the surface of the upper support plate 7 is appropriate.

[0045] Specifically, the lower supporting bracket 5, the upper supporting bracket 8, the lower support plate 6 and the upper support plate 7 are all made of stainless steel.

[0046] Specifically, the total length of the hand-held handle 1, the hydraulic cylinder 3, the upper supporting bracket 8 and the upper support plate 7 should not be greater than 300 mm for use in a small wind tunnel device.

[0047] The present invention is mainly composed of a hydraulic mechanism, a conical expansion head 4 and a supporting bracket. The hydraulic mechanism is composed of a hand-held handle 1, a pressure relief nut 2, a hydraulic cylinder 3, a hydraulic support 9, a pressure rod piston 10 and a hydraulic rod 11, wherein the hand-held handle 1 is installed on the hydraulic cylinder 3, the hydraulic rod 11 is connected to the hydraulic cylinder 3 through the hydraulic support 9, and drives the pressure rod piston 10 to drive the hydraulic cylinder 3 to work, and the tightening and loosening of the pressure relief nut 2 on the hydraulic cylinder 3 can realize the maintenance and release of the oil pressure in the hydraulic cylinder 3. The conical expansion head 4 is fixed on the hydraulic cylinder 3 and can move with the hydraulic rod 11 in the hydraulic cylinder 3. The supporting bracket is composed of a lower supporting bracket 5, a lower supporting plate 6, an upper supporting bracket 8 and an upper supporting plate 7, wherein the lower supporting bracket 5 and the upper supporting bracket 8 are fixed on the hydraulic cylinder 3, and the lower supporting plate 6 and the upper supporting plate 7 are respectively installed on the lower supporting bracket 5 and the upper supporting bracket 8.

[0048] Working principle:

[0049] When the test is finished and the flat plate model in the rectangular turbulent duct is removed, hold the handheld handle 1, first loosen the pressure relief nut 2, so that the conical expansion head 4 retracts with the hydraulic rod 11 in the hydraulic cylinder 3, and then tighten the pressure relief nut 2, adjust the positions of the lower support plate 6 and the upper support plate 7, extend the lower support plate 6 and the upper support plate 7 into the duct, ensure that the lower support plate 6 and the upper support plate 7 are in horizontal contact with the inner wall of the duct and the surface of the model respectively, and drive the pressure rod piston 10 by pressing the hydraulic rod 11 to drive the hydraulic cylinder 3 to work. The conical expansion head 4 moves forward under the push of the hydraulic rod in the hydraulic cylinder 3, so that the lower supporting bracket 5 and the upper supporting bracket 8 are opened to both sides, and the upper supporting plate 7 and the lower supporting plate 6 respectively apply a thrust uniformly to the flat plate model and the inner wall of the duct, thereby pushing the flat plate model out of the turbulent duct, and completing the removal of the flat plate model. The groove of the upper support plate 7 can be filled with soft material to contact with the model surface to prevent direct contact from causing damage to the surface morphology of the model.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for removing a flat plate model in a supersonic rectangular turbulent duct, characterized in that: It includes a hydraulic mechanism, an expansion part, a supporting bracket, and a supporting part; the hydraulic mechanism is hinged to the ends of two relatively arranged supporting brackets, and the expansion part is connected to the telescopic end of the hydraulic mechanism; The expansion part is arranged between the two supporting brackets, and when the telescopic end of the hydraulic mechanism extends, the expansion part squeezes the two supporting brackets, and the two supporting brackets move away from each other; One end of the supporting bracket away from the hydraulic mechanism is hinged with a supporting part; The supporting part includes a lower supporting plate and an upper supporting plate; both the lower supporting plate and the upper supporting plate are in a U shape; the U-shaped side wall of the lower supporting plate is hinged with a lower supporting bracket; the U-shaped side wall of the upper supporting plate is hinged with an upper supporting bracket; The contact ends of the lower supporting plate and the upper supporting plate with the rectangular turbulent conduit are provided with grooves; a buffer layer is arranged in the grooves, and the buffer layer is 3-4 mm higher than the surface of the upper supporting plate.

2. The device for removing a flat plate model in a supersonic rectangular turbulent duct according to claim 1, characterized in that: The hydraulic mechanism includes: a hand-held handle, a pressure relief nut, a hydraulic cylinder, a hydraulic support, a pressure rod piston, and a hydraulic rod; the hand-held handle is arranged at one end of the hydraulic cylinder, and the other end of the hydraulic cylinder is the telescopic end; the side wall of the hydraulic cylinder is provided with a pressure relief nut, a pressure rod piston, and a hydraulic support, and the hydraulic support is hinged with the hydraulic rod, and the pressure rod piston is connected to the hydraulic rod.

3. The device for removing a flat plate model in a supersonic rectangular turbulent duct according to claim 2, characterized in that: The hydraulic support and the pressure rod piston are arranged adjacent to each other.

4. The device for removing a flat plate model in a supersonic rectangular turbulent duct according to claim 1, characterized in that: The expansion part is a conical expansion head; the conical end of the expansion part is in contact with one side adjacent to the two supporting brackets.

5. The device for removing a flat plate model in a supersonic rectangular turbulent duct according to claim 1, characterized in that: The supporting bracket includes a lower supporting bracket and an upper supporting bracket; the ends of the lower supporting bracket and the upper supporting bracket close to the hydraulic mechanism are arranged at intervals, and the interval distance is the outer diameter distance of the expansion part; the middle parts of the lower supporting bracket and the upper supporting bracket overlap, and the interval distance from the ends of the lower supporting bracket and the upper supporting bracket close to the hydraulic mechanism to the middle gradually becomes smaller.

6. The device for removing a flat plate model in a supersonic rectangular turbulent duct according to claim 5, characterized in that: The upper supporting bracket is provided with a slot; when the middle parts of the lower supporting bracket and the upper supporting bracket overlap, the middle part and the end provided with the supporting part of the lower supporting bracket are arranged in the slot.

7. The device for removing a flat plate model in a supersonic rectangular turbulent flow duct according to claim 6, characterized in that: The interval distance between the opposite walls of the slot is greater than the distance between the opposite side walls of the lower supporting plate.

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