Heat-proof device with reset locking function

Abstract

The utility model discloses a heatproof device with reset locking, which comprises a heatproof shell and a protective cover, one end of the heatproof shell is provided with an opening, the protective cover is rotatably connected onto the heatproof shell through an elastic hinge, the heatproof shell is further provided with a reset locking mechanism, the reset locking mechanism comprises a locking pin and a support fixed on the heatproof shell, and the support is provided with a locking groove. The locking pin is arranged on the protective cover in a sliding mode, a return assembly is further arranged in the support, and a through hole for the return assembly to stretch into is formed in the heat-proof shell. When the protective cover is located at the opening position, the locking pin is inserted into the insertion hole and abuts against the return assembly, and the end of the return assembly extends into the heat-proof shell. And when the connector is separated, the return assembly is pushed to push the locking pin out of the jack, and the protective cover closes the opening of the heat-proof shell under the driving of the elastic hinge. The thermal protection device has the advantages that the thermal protection function can be effectively completed only by manually turning over the protective cover to open the opening, and compared with a mode of wrapping and coating various materials, the cost is lower.

Description

Technical Field

[0001] The utility model relates to the field of aviation, and particularly relates to a heat protection device with reset locking. Background Technique

[0002] At present, some domestic launch vehicles adopt a thermal separation scheme for the first and second stages. The heat protection device used for the connector between the two-stage rockets usually adopts the overall material protection method of cables and connectors. For example, Chinese Patent Publication No. CN116683230A, titled "A Thermal Protection Structure for Electrical Connectors Suitable for Launch Vehicles", in this utility model, the connector and the cable adopt thermal protection measures such as a ceramized silicone rubber heat insulation protective sleeve and aluminum foil tape to achieve the measure of rapid heat protection of the connector. However, this method has a high material cost and high requirements for material fitting. In a certain equipment usage scenario, it is necessary to provide heat protection for the parts inside a certain connector device at the tail after launch, and the above method will not be applicable. Content of the Utility Model

[0003] The purpose of the utility model is to provide a heat protection device with reset locking, which can effectively solve the problems that the existing connector has high cost for heat protection by material method and high requirements for material fitting, and cannot provide heat protection for the internal parts of the electrical connector after the electrical connector is detached.

[0004] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0005] A heat protection device with reset locking includes a heat protection housing with an opening at one end and a protective cover arranged on the heat protection housing to close the opening. The protective cover is rotatably connected to the heat protection housing through an elastic hinge. A connector is arranged inside the heat protection housing. The heat protection housing is also provided with a reset locking mechanism. The reset locking mechanism includes a locking pin and a bracket fixed on the heat protection housing. The locking pin is slidably arranged on the protective cover. A jack for the locking pin to insert is opened on the bracket. A return component is also arranged inside the bracket. A through hole for the return component to extend into its interior is opened on the heat protection housing;

[0006] When the protective cover is in the open position, the locking pin inserts into the jack and abuts against the return component, and the end of the return component extends into the heat protection housing; when the connector is disconnected, the return component is pushed to push the locking pin out of the jack, and the protective cover closes the opening of the heat protection housing under the drive of the elastic hinge.

[0007] In the above heat protection device with reset locking, a first horizontal slideway, a vertical slideway, and a second horizontal slideway are sequentially arranged inside the bracket. One end of the first horizontal slideway communicates with the jack, and one end of the second horizontal slideway communicates with the through hole. The return component includes multiple sections of sliding rods that are sequentially abutted. One section of sliding rod is arranged in each slideway, and a guiding inclined surface is arranged between adjacent sliding rods.

[0008] In the above heat protection device with reset locking, a protruding eaves protruding radially outward is arranged on the sliding rod in the second horizontal slideway, and a first elastic member is sleeved on the sliding rod between the protruding eaves and the side wall of the heat protection housing.

[0009] In the above heat protection device with reset locking, an arc-shaped slideway is arranged inside the bracket. The return component is an arc-shaped sliding rod arranged in the arc-shaped slideway. The locking pin passes through the jack to push the arc-shaped sliding rod, and the end of the arc-shaped sliding rod away from the locking pin extends into the heat protection housing.

[0010] In the above heat protection device with reset locking, the elastic hinge includes two fixed seats arranged at intervals and a rotating shaft passing through the fixed seats. A connecting seat connected to the protection cover is arranged on the rotating shaft. The locking pin is slidably arranged on the connecting seat, and a torsion spring for returning the connecting seat is also sleeved on the rotating shaft.

[0011] In the above heat protection device with reset locking, a sliding hole is arranged inside the connecting seat. The locking pin is slidably arranged in the sliding hole, and a second elastic member is arranged between the locking pin and the bottom end of the sliding hole.

[0012] In the above heat protection device with reset locking, the sliding direction of the locking pin is perpendicular to the rotating direction of the protection cover.

[0013] In the above heat protection device with reset locking, a group of brackets are respectively arranged on the left and right side walls of the heat protection housing beside the opening, and two groups of locking pins are correspondingly arranged on the protection cover.

[0014] In the above heat protection device with reset locking, when the protection cover closes the opening, the elastic hinge has a pre-tightening force for making the protection cover closely adhere to the opening.

[0015] Compared with the prior art, the advantages of the present utility model are:

[0016] By adding a reset locking mechanism between the heat-insulating housing and the protective cover, the problems that the current thermal protection of the connector by means of materials has high cost and high requirements for material fit, and the internal parts of the electrical connector cannot be thermally protected after the electrical connector is separated are solved. The heat-insulating housing provides a heat-insulating space for the connector to protect it from heat. Through the elastic hinge, the opened protective cover has a tendency to move towards the direction of closing the opening. By matching the locking pin of the reset locking mechanism with the jack on the bracket, the protective cover can be kept in the opened state, that is, when the electrical connector is not separated, the protective cover will not affect the electrical connector. Only when the connector is separated, the separated electrical connector will trigger the return component to push the locking pin out of the jack. Under the action of the elastic hinge, the protective cover will flip to close the opening and protect the electrical components in the heat-insulating housing. For the heat protection device with the above structure, only need to manually flip the protective cover to open the opening, and it will automatically trigger to close the opening when the electrical connector is separated, without other operation steps. The simple transmission structure design can effectively complete the heat protection function, and the cost is lower compared with the method of wrapping and coating with various materials.

[0017] Further, a first horizontal slideway, a vertical slideway and a second horizontal slideway are sequentially connected in the bracket. One end of the first horizontal slideway is communicated with the jack, and one end of the second horizontal slideway is communicated with the through hole; the return component includes a plurality of sliding rods sequentially abutted. One sliding rod is arranged in each slideway, and a guiding inclined surface is arranged between adjacent sliding rods. A structure of the interior of the bracket and the corresponding return component realizes the transmission of force through multiple sliding rods, so that the return component extending into the heat-insulating housing can be better triggered. Through the guiding inclined surfaces between the sliding rods, the sliding rods at different positions can be triggered to move, and the arrangement is more flexible.

[0018] Further, a convex eaves protruding radially outward is arranged on the sliding rod in the second horizontal slideway, and a first elastic member is sleeved on the sliding rod between the convex eaves and the side wall of the heat-insulating housing. The sliding rod in the second horizontal slideway is pushed by the first elastic member to prevent the sliding rod in the second horizontal slideway from extending into the heat-insulating housing when it is not affected by other external forces, so as to avoid interference with the insertion of the electrical connector.

[0019] Further, an arc-shaped slideway is arranged in the bracket, the return component is an arc-shaped sliding rod arranged in the arc-shaped slideway, the locking pin passes through the jack to push the arc-shaped sliding rod, and the end of the arc-shaped sliding rod away from the locking pin extends into the heat-insulating housing. Another structure of the interior of the bracket and the corresponding return component realizes the purpose of pushing the locking pin out of the jack by sliding the arc-shaped sliding rod in the arc-shaped slideway when the arc-shaped sliding rod is pushed. Since an integral arc-shaped sliding rod is adopted, its transmission efficiency is higher and it is not easy to get stuck.

[0020] Furthermore, the elastic hinge includes two spaced-apart fixing seats and a rotating shaft extending through the fixing seats. The rotating shaft is provided with a connecting seat connected to the protective cover. The locking pin is slidably mounted on the connecting seat. The rotating shaft is also provided with a torsion spring that returns the connecting seat to its original position. The locking pin is mounted on the connecting seat, ensuring that the locking pin rotates with the protective cover. When the locking pin is inserted into the socket, the protective cover is also secured in position. After the locking pin is pushed out of the socket, the torsion spring is released, which drives the connecting seat to rotate, causing the locking pin to leave the locked position and drive the protective cover to close the opening.

[0021] Furthermore, a sliding hole is provided in the connecting base, the locking pin is slidably disposed in the sliding hole, and a second elastic member is provided between the locking pin and the bottom end of the sliding hole. The second elastic member prevents the locking pin from being disengaged from the socket due to accidental reasons such as vibration after being inserted into the socket.

[0022] Furthermore, the sliding direction of the locking pin is perpendicular to the rotation direction of the protective cover, so that the locking pin will not be disengaged from the insertion hole when the protective cover is subjected to external force.

[0023] Furthermore, a set of brackets is provided on the left and right side walls of the heat-resistant housing near the opening, and two sets of locking pins are provided on the protective cover. The two sets of brackets ensure that the left and right sides of the protective cover are balanced when the protective cover is open, preventing the protective cover from twisting. If one set of locking pins fails, the other set of locking pins can still keep the protective cover open.

[0024] Furthermore, when the protective cover closes the opening, the elastic hinge has a pre-tightening force that keeps the protective cover close to the opening. Even after the protective cover closes the opening, a certain pre-tightening force is still provided to the protective cover to prevent the protective cover from rebounding due to airflow vibrations, and to keep the protective cover in the closed opening position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional diagram of the heat protection device of the utility model in a closed state;

[0026] Figure 2 This is a three-dimensional diagram of the heat-proof housing of the present invention after the reset locking mechanism is installed;

[0027] Figure 3 This is a cross-sectional view of the heat-proof housing of the present invention after the reset locking mechanism is installed;

[0028] Figure 4 This is a schematic structural diagram of the return assembly and the bracket when the protective cover is in the closed state in the present invention;

[0029] Figure 5 This is a schematic structural diagram of the return assembly and the bracket when the protective cover is in the open state in the present invention;

[0030] Figure 6 This is a schematic structural view of the elastic hinge in the present utility model;

[0031] Figure 7 This is a perspective view of the heat protection device of the present utility model in the open state.

[0032] The reference signs are as follows:

[0033] Heat protection housing 100, protective cover 200, elastic hinge 300, fixed seat 310, rotating shaft 320, connecting seat 330, torsion spring 340, sliding hole 350, second elastic member 360, reset locking mechanism 400, locking pin 410, bracket 420, first horizontal slideway 421, vertical slideway 422, second horizontal slideway 423, sliding rod 430, protruding eaves 431, first elastic member 440. Specific embodiments

[0034] A heat protection device with reset locking includes a heat protection housing 100 with an opening at one end and a protective cover 200 arranged on the heat protection housing 100 to close the opening. The protective cover 200 is rotatably connected to the heat protection housing 100 through an elastic hinge 300. A connector is arranged inside the heat protection housing 100. The heat protection housing 100 is further provided with a reset locking mechanism 400. The reset locking mechanism 400 includes a locking pin 410 and a bracket 420 fixed on the heat protection housing 100. The locking pin 410 is slidably arranged on the protective cover 200. A jack for the locking pin 410 to insert is opened on the bracket 420. A return component is further arranged inside the bracket 420. A through hole for the return component to extend into its interior is opened on the heat protection housing 100. When the protective cover 200 is in the open position, the locking pin 410 inserts into the jack and abuts against the return component, and the end of the return component extends into the heat protection housing 100. When the connector is disconnected, the return component is pushed to push the locking pin 410 out of the jack, and the protective cover 200 closes the opening of the heat protection housing 100 driven by the elastic hinge 300.

[0035] By adding a reset locking mechanism 400 between the heat-proof housing 100 and the protective cover 200, the problems that the current heat protection of the connector by means of materials has high cost and high requirements for material fit, and the internal parts of the electrical connector cannot be heat-protected after the electrical connector is detached are solved. The heat-proof housing 100 provides a heat-insulating space for the connector to protect it from heat. Through the elastic hinge 300, the opened protective cover 200 has a tendency to move towards the direction of closing the opening. By using the cooperation between the locking pin 410 of the reset locking mechanism 400 and the jack on the bracket 420, the protective cover 200 can be kept in the opened state, that is, when the electrical connector is not separated, the protective cover 200 will not affect the electrical connector. Only when the connector is detached, the detached electrical connector will trigger the return assembly to push the locking pin 410 out of the jack. Under the action of the elastic hinge 300, the protective cover 200 flips to close the opening and protect the electrical components in the heat-proof housing 100. For the heat-proof device with the above structure, only the protective cover 200 needs to be manually flipped to open the opening, and the opening will be automatically triggered to close when the electrical connector is separated, without other operation steps. The simple transmission structure design can effectively complete the heat-proof protection function, and the cost is lower compared with the method of wrapping and coating with various materials.

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] Refer to Figures 1 to 7 is an embodiment of a heat protection device with reset locking in the present utility model. The heat protection device with reset locking includes a heat protection housing 100 with an opening at one end. The heat protection housing 100 can be made into a specific shape according to needs. In this embodiment, the heat protection housing 100 is taken as a rectangular housing for introduction. An opening is provided on one surface of the heat protection housing 100 to facilitate the insertion of a connector. Other electrical components for connector docking can also be arranged in the heat protection housing 100. A protective cover 200 is provided on the heat protection housing 100 at the opening. The function of the protective cover 200 is to close the opening after the connector is detached, so as to avoid damaging the electrical components in the heat protection housing 100. An elastic hinge 300 is provided on the heat protection housing 100 beside the opening. The elastic hinge 300 is also connected to the protective cover 200. Through the elastic hinge 300, the protective cover 200 can be driven to close the opening.

[0041] A reset locking mechanism 400 is further provided on the heat protection housing 100. The reset locking mechanism 400 includes a locking pin 410 and a bracket 420 fixed on the heat protection housing 100. The locking pin 410 is slidably arranged on the protective cover 200. A jack for the locking pin 410 to insert is formed on the bracket 420. In this way, after the locking pin 410 is opened to an appropriate position along with the protective cover 200, the locking pin 410 can be inserted into the jack, thereby locking the position of the protective cover 200 relative to the heat protection housing 100, that is, the protective cover 200 can be in an open state. A return component is further arranged in the bracket 420. A through hole for the return component to extend into its interior is formed on the heat protection housing 100. The through hole can be used to make a part of the return component extend into the heat protection housing 100.

[0042] When the protective cover 200 is in the open position, the locking pin 410 is inserted into the jack and abuts against the return component, pushing the end of the return component into the heat-proof housing 100. On the one hand, the locking pin 410 and the bracket 420 are in a locked state, that is, the position of the fixed-bar protective cover 200 relative to the heat-proof housing 100 is fixed, and the heat-proof housing 100 is in an open state. On the other hand, the end of the return component extends into the heat-proof housing 100, providing conditions for the connector disconnection to trigger the movement of the return component; when the connector is disconnected, the disconnected part of the connector exits from the opening of the heat-proof housing 100. During this process, the disconnected part of the connector will push the return component, squeezing the part of the return component extending into the heat-proof housing 100 back into the bracket 420. Since the return component has to move relative to the bracket 420, the movement of the return component will push the locking pin 410 in contact with the return component out of the jack. At this time, the locking pin 410 will separate from the bracket 420, releasing the locked state. The protective cover 200 is affected by the elastic hinge 300 to close the opening of the heat-proof housing 100, achieving the purpose of automatic cover closing.

[0043] Structures for the return component to squeeze the corresponding bracket 420 include but are not limited to the following structures:

[0044] As Figures 3 to 5 shown, one type is that a first horizontal slideway 421, a vertical slideway 422, and a second horizontal slideway 423 are sequentially connected in the bracket 420. One end of the first horizontal slideway 421 communicates with the jack, and one end of the second horizontal slideway 423 communicates with the through hole. In the vertical direction, the first horizontal slideway 421 is located above the second horizontal slideway 423; the return component includes multiple sections of sliding rods 430 that are sequentially abutted. One section of the sliding rod 430 is provided in each slideway, and a guiding inclined surface is provided between adjacent sliding rods 430. In this way, when the locking pin 410 is inserted from the jack into the bracket 420, it will push the sliding rod 430 in the first horizontal chute to slide away from the heat-proof housing 100. Due to the guiding inclined surface between adjacent sliding rods 430, the movement of this sliding rod 430 will push the sliding rod 430 in the vertical chute to move downward. The downward-moving sliding rod 430 will push the sliding rod 430 in the second horizontal chute to slide towards the heat-proof housing 100, so that the end of the sliding rod 430 in the second horizontal slideway 423 extends into the heat-proof housing 100.

[0045] Furthermore, in order to prevent the sliding rod 430 from sliding into the heat-proof housing 100 and affecting the connector docking when the locking pin 410 is not inserted into the bracket 420, a convex eaves 431 protruding radially outward is provided on the sliding rod 430 in the second horizontal slideway 423. A first elastic member 440 is sleeved on the sliding rod 430 between the convex eaves 431 and the side wall of the heat-proof housing 100. The first elastic member 440 generally uses a compression spring to prevent the sliding rod 430 from entering the heat-proof housing 100 when not under external force.

[0046] Another way is to provide an arc-shaped chute inside the bracket 420. One end of the arc-shaped chute communicates with the jack on the bracket 420, and the other end communicates with the through hole on the heat-proof housing 100. The length and angle of the arc-shaped chute are determined according to the position of the jack. An arc-shaped sliding rod is provided inside the arc-shaped chute. When the locking pin 410 is inserted into the arc-shaped chute through the jack, it will push the arc-shaped sliding rod to slide inside the arc-shaped chute, and the end of the arc-shaped sliding rod will extend into the heat-proof housing 100 through the through hole. When the connector is pulled out, it will push the arc-shaped sliding rod to slide, causing the arc-shaped sliding rod to withdraw from the heat-proof housing 100, and at the same time, the arc-shaped sliding rod will push the locking pin 410 out of the jack.

[0047] Based on the above embodiments, as Figure 2 、 Figure 6 shown, the elastic hinge 300 includes two fixed seats 310 arranged at intervals and a rotating shaft 320 passing through the fixed seats 310. The fixed seats 310 are fixed on the heat-proof housing 100. A connecting seat 330 connected to the protective cover 200 is provided on the rotating shaft 320. The locking pin 410 is slidably arranged on the connecting seat 330 or the protective cover 200. In this embodiment, the locking pin 410 is slidably arranged on the connecting seat 330. In this way, the step of fixing the locking pin 410 can be omitted during installation, and in addition, the connecting seat 330 can be used as the carrier for the locking pin 410 to slide. A torsion spring 340 is also sleeved on the rotating shaft 320. The torsion spring 340 enables the connecting seat 330 to return to the initial position after rotation, that is, the torsion spring 340 can make the protective cover 200 return from the open position to the closed position.

[0048] Furthermore, a sliding hole 350 is provided inside the connecting seat 330. The locking pin 410 is slidably arranged in the sliding hole 350. A second elastic member 360 is provided between the locking pin 410 and the bottom end of the sliding hole 350. The second elastic member 360 can be a compression spring. By the second elastic member 360, the locking pin 410 is prevented from retracting into the sliding hole 350. After the locking pin 410 is inserted into the jack, the locking pin 410 is prevented from disengaging from the jack due to vibration. However, the elastic force generated by the second elastic member 360 is greater than the elastic force generated by the first elastic member 440 to ensure that the locking pin 410 will not be pushed out by the elastic force generated by the first elastic clip after being inserted into the jack. Still further, when the protective cover 200 closes the opening, the torsion spring 340 will still generate a pre-tightening force that presses the protective cover 200 tightly against the opening, preventing the protective cover 200 from rebounding under air flow vibration and keeping the protective cover 200 always in the closed opening position.

[0049] Based on the above embodiments, the sliding direction of the locking pin 410 is perpendicular to the rotation direction of the protective cover 200. When the protective cover 200 is rotated by an external force, since the sliding direction of the locking pin 410 is perpendicular to the rotation direction of the protective rod, the protective cover 200 will not be able to drive the locking pin 410 to slide, thus ensuring the stability of the protective cover 200 in the open position.

[0050] On the left and right side walls of the heat-proof housing 100 beside the opening, a set of brackets 420 are respectively provided. Correspondingly, two sets of locking pins 410 are provided on the protective cover 200. The two sets of brackets 420 ensure that when the protective cover 200 is in the open state, the forces on both sides are balanced, avoiding torsion of the protective cover 200. Even if one set of locking pins 410 fails, the other set of locking pins 410 can still keep the protective cover 200 in the open state.

[0051] As Figure 1 , Figure 7 shown, before the rocket launch, manually open the protective cover 200, and insert the locking pin 410 into the jack of the bracket 420. As the locking pin 410 is inserted, the locking pin 410 will push the return component inside the bracket 420 to slide. The end of the return component will extend from the through hole and insert into the heat-proof housing 100. Through the locking pin 410, the relative position of the protective cover 200 is fixed, keeping the heat-proof housing 100 in the open state, which is convenient for docking the connector. After the rocket launch, with the separation of the first and second stages, the connector disconnects and disengages from the heat-proof housing 100. When the connector disengages from the heat-proof housing 100, the connector will push the part of the return component located inside the heat-proof housing 100 to exit the through hole, and the return component will simultaneously push the locking pin 410 out of the jack. Since the locking pin 410 exits the jack, the protective cover 200 closes the opening under the action of the elastic hinge 300, protecting the electrical components inside the heat-proof housing 100. The heat-proof device with the above structure is simple to operate. Only by manually flipping and opening the protective cover 200 can the device be locked. During separation, the connector impacts and follows for separation, without manual operation and without cumbersome and redundant actions. The heat release protection function can be completed through a simple transmission structure. Compared with the method of wrapping and coating with multiple materials, the cost is lower.

[0052] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A heat protection device with reset and locking functions, comprising a heat protection housing with an opening at one end and a protective cover arranged on the heat protection housing to close the opening. The protective cover is rotatably connected to the heat protection housing through an elastic hinge. A connector is arranged inside the heat protection housing, and it is characterized in that, A reset locking mechanism is further provided on the heat-insulating housing. The reset locking mechanism includes a locking pin and a bracket fixed on the heat-insulating housing. The locking pin is slidably arranged on the protective cover. A jack for inserting the locking pin is formed on the bracket. A return component is further arranged in the bracket. A through hole for the return component to extend into its interior is formed on the heat-insulating housing. When the protective cover is in the open position, the locking pin is inserted into the jack and abuts against the return component. The end of the return component extends into the heat-insulating housing. When the connector is disconnected, the return component is pushed to push the locking pin out of the jack, and the protective cover closes the opening of the heat-insulating housing under the drive of the elastic hinge.

2. The heat prevention device with reset locking as described in claim 1, characterized in that, A first horizontal slideway, a vertical slideway and a second horizontal slideway are sequentially connected in the bracket. One end of the first horizontal slideway communicates with the jack. One end of the second horizontal slideway communicates with the through hole. The return component includes a plurality of sliding rods that are sequentially abutted. One sliding rod is arranged in each slideway. A guiding inclined surface is arranged between adjacent sliding rods.

3. The heat prevention device with reset locking as claimed in claim 2, characterized in that, A convex eaves protruding radially outwards is arranged on the sliding rod in the second horizontal slideway. A first elastic member is sleeved on the sliding rod between the convex eaves and the side wall of the heat-insulating housing.

4. The heat prevention device with reset locking according to claim 1, characterized in that, An arc-shaped slideway is arranged in the bracket. The return component is an arc-shaped sliding rod arranged in the arc-shaped slideway. The locking pin passes through the jack to push the arc-shaped sliding rod. The end of the arc-shaped sliding rod away from the locking pin extends into the heat-insulating housing.

5. The heat prevention device with reset locking as claimed in claim 1, wherein The elastic hinge includes two spaced fixed seats and a rotating shaft passing through the fixed seats. A connecting seat connected to the protective cover is arranged on the rotating shaft. The locking pin is slidably arranged on the connecting seat. A torsion spring for returning the connecting seat is further sleeved on the rotating shaft.

6. The heat prevention device with reset locking according to claim 5, characterized in that, A slide hole is arranged in the connecting seat. The locking pin is slidably arranged in the slide hole. A second elastic member is arranged between the locking pin and the bottom end of the slide hole.

7. The heat prevention device with reset locking according to claim 1, characterized in that, The sliding direction of the locking pin is perpendicular to the rotation direction of the protective cover.

8. The heat prevention device with reset locking as claimed in claim 1, characterized in that, A set of brackets are respectively arranged on the left and right side walls of the heat-insulating housing beside the opening. Two sets of locking pins are correspondingly arranged on the protective cover.

9. The heat prevention device with reset locking as described in claim 1, characterized in that, When the protective cover closes the opening, the elastic hinge has a pre-tightening force to make the protective cover closely adhere to the opening.

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