A mechanical limiting device for a pressure relief protective cover

Abstract

The invention relates to a mechanical limit device for a pressure relief protective cover, the limit device comprises a mounting base and a rotating support, the mounting base or the rotating support is provided with a long slot or a long hole; the rotating support is slidably assembled on the mounting base; a cantilevered arm is provided on one side of the rotating support; the limit device also comprises a guide sleeve, the guide sleeve is located at the other side of the rotating support, a pushing rod is slidably assembled in the guide sleeve, and a limit block is fixedly provided at one end of the pushing rod toward the rotating support, and the mechanical limit device also comprises an elastic member; the limit block has a pressing position which is located on the same side of the pin shaft as the guide sleeve and is pressed on the rotating seat by the elastic member, and also has a limiting position which is pushed to the other side of the pin shaft by the elastic member after the rotating support rotates relative to the mounting base, and the limit block and the guide sleeve both have limiting surfaces which are attached to the corresponding sides of the rotating support. When the limit block is in the limiting position, the limit block and the limiting surfaces on the guide sleeve are respectively arranged on both sides of the pin shaft to prevent the rotating support from flipping.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure relief, and in particular to a mechanical limiting device for a pressure relief protective cover. Background Art

[0002] In the prior art, certain relatively enclosed special sites (such as ammunition depots) can experience unexpected events that can cause stored materials to burn or explode, leading to smoke and pressure accumulation within the enclosed space. If the release of smoke and pressure cannot be effectively directed, the entire storage facility will be deformed and damaged, and even cause chain explosions and the spread of toxic gases, threatening the safety of nearby personnel and equipment. Therefore, such special sites are usually equipped with a pressure relief device. The pressure relief device has a straight-through pressure relief channel with a pressure relief protective cover. When the pressure within the special site rises to a set threshold, the consumable parts of the pressure relief device automatically break, and the pressure relief protective cover is ejected from the pressure relief channel in a straight line, achieving pressure relief.

[0003] Although the pressure relief device in the prior art achieves pressure relief by throwing the pressure relief protective cover out of the pressure relief channel, there are some disadvantages in actual use: usually, the pressure relief protective cover is not constrained, and the pressure relief protective cover is completely out of the special place after being thrown out, but this can easily hit nearby people or other objects. For this reason, in the prior art, the pressure relief protective cover is bolted to a special place or other fixed object with a rope. After the pressure relief protective cover is thrown out of the pressure relief channel, it is constrained by the rope so that the pressure relief protective cover is pulled back by the rope after linear displacement for a certain distance. However, the method of bolting with a rope also has certain disadvantages: the rope is a flexible structure, and there is still a risk that the pressure relief protective cover will hit nearby people and special places after being thrown out. Therefore, it is necessary to design a limiting device to limit the movement of the pressure relief protective cover. Summary of the Invention

[0004] The purpose of the present invention is to provide a mechanical limiting device for a pressure relief protective cover, so as to solve the technical problem in the prior art that the pressure relief protective cover is easily hit by nearby people and special places after being thrown out.

[0005] To achieve the above objectives, the mechanical limiting device for the pressure relief protective cover in the present invention adopts the following technical solutions:

[0006] A mechanical limit device for a pressure relief protective cover comprises a mounting base and a rotating support, wherein a long slot or a long hole is provided on the mounting base or the rotating support, and when the pressure relief device is not relieving pressure, the extension direction of the long slot or the long hole is used to be consistent with the movement direction of the pressure relief protective cover in the pressure relief channel; the rotating support is slidably assembled on the mounting base by a pin shaft passing through the long slot or the long hole; the long slot or the long hole has an inner wall for cooperating with the pin shaft to stop and limit the movement limit of the pressure relief protective cover during pressure relief, and the rotating support can rotate around the axis of the pin shaft after the pin shaft cooperates with the inner wall stop; a cantilever arm is provided on one side of the rotating support, and a connecting structure for connecting to the pressure relief protective cover is provided on the cantilever; the mechanical limit device also comprises a cantilever arm relative to the mounting base The guide sleeve is fixedly arranged on the base, and the guide sleeve is located at the other side of the rotating support. A pushing rod is slidably assembled in the guide sleeve, and a limit block is fixed to one end of the pushing rod facing the rotating support. The mechanical limit device also includes an elastic member that applies elastic force to the pushing rod to press the limit block against the rotating support; the limit block has a pressing position that is located on the same side of the pin shaft as the guide sleeve and is pressed against the rotating seat by the elastic member. It also has a limiting position that is pushed to the other side of the pin shaft by the elastic member after the rotating support rotates relative to the mounting base. The limit block and the guide sleeve both have limiting surfaces that fit on the corresponding sides of the rotating support. When the limit block is in the limiting position, the limiting surfaces on the limit block and the guide sleeve are located on both sides of the pin shaft to prevent the rotating support from flipping.

[0007] The beneficial effects of the above technical solution are: through the cooperation of the pin shaft and the long slot / long hole, the linear movement and rotation of the rotating support can be constrained, preventing the pressure relief protective cover connected to the rotating support from flying around and hitting people or objects; the guide sleeve, the push rod and the elastic member can apply a continuous and reliable elastic force to the limit block, and the limit block and the guide sleeve in the limiting position are respectively arranged on both sides of the pin shaft, and the limiting surfaces are both in contact with the rotating support. At this time, the rotating support cannot be forward or reversed, so it remains in the set position, which can prevent it from hitting special places, and can also prevent it from reversing and being blocked in the pressure relief channel again. The limit device of the present invention adopts a purely mechanical structure and does not require electronic control operation. It is more suitable for special places with explosion-proof requirements.

[0008] Furthermore, the rotation angle of the rotating support is 90°, and the limiting surfaces of the limiting block and the guide sleeve are both planes extending along the moving direction of the push rod.

[0009] The beneficial effects of the above technical solution are: the rotation angle of the rotating support is 90°, the limiting surfaces on the limiting block and the guide sleeve are kept in the same plane, and the limiting surfaces of the limiting block and the guide sleeve are relatively easy to process.

[0010] Furthermore, the pressing rod is provided with a convex ring, and the elastic member is used to press the convex ring to apply elastic force to the limit block; the guide sleeve is provided with a stop portion for cooperating with the convex ring to limit the moving stroke of the limit block.

[0011] The beneficial effect of the above technical solution is that the movement limit of the limit block can be limited by the stopping cooperation between the convex ring and the stop portion, thereby ensuring that the limit block and the guide sleeve are reliably placed on both sides of the pin shaft.

[0012] Furthermore, a protective cover is threadedly mounted on the guide sleeve, the convex ring is located in the protective cover, the elastic member is pressed between the bottom wall of the protective cover and the convex ring, and the stop portion is the end face of the guide sleeve.

[0013] The beneficial effects of the above technical solution are: the elastic member is pressed between the bottom wall of the protective cover and the convex ring, the arrangement is relatively simple, and the stop portion is formed by utilizing the end face of the guide sleeve, so the overall structure is relatively simple.

[0014] Furthermore, the limiting block is sleeved on the pushing rod, and the mechanical limiting device further includes a set screw that is screwed into the pushing rod to fix the limiting block on the pushing rod.

[0015] The beneficial effect of the above technical solution is that the limit block is sleeved on the push rod and fixed with a set screw. Compared with the method of fixing the limit block on the end face of the push rod, the overall length of the limit block and the push rod is smaller, which can reduce the size of the entire limit device.

[0016] Furthermore, the mounting base includes two support plates spaced apart along the axial direction of the pin shaft, the rotating support is located between the two support plates, the pin shaft passes through the rotating support and the two support plates, and the limit block is used to penetrate or pass through the space formed by the two support plates.

[0017] The beneficial effect of the above technical solution is that the rotating support is located between the two support plates, which can improve the supporting strength of the mounting base to the rotating support. At the same time, the two support plates can constrain and limit the position of the rotating support in the axial direction of the pin shaft.

[0018] Furthermore, an ear plate is protruding from one side of the two support plates, and the two ear plates are arranged at intervals along the axial direction of the pin shaft. The guide sleeve is fixed on the two ear plates, and the limit block located at the top pressure position is located between the two ear plates.

[0019] The beneficial effect of the above technical solution is that the ear plate is protruded on the support plate, and a space capable of accommodating the guide sleeve is formed between the two ear plates, so that the end face of the guide sleeve can be designed as a flat structure, the overall structure is simple, and installation is convenient.

[0020] Furthermore, the connection structure is a threaded hole or a bolt through-hole provided on the cantilever.

[0021] The beneficial effect of the above technical solution is that the pressure relief protective cover is mounted on the cantilever by using a screw member, and the fixing method is more reliable.

[0022] Furthermore, the guide sleeve is fixed on the mounting base.

[0023] The beneficial effect of the above technical solution is that the guide sleeve is fixed on the mounting base to form an integral body, and the relative positions among the limit block, the push rod and the rotating support are easily ensured.

[0024] Furthermore, the rotating support is a T-shaped structure, and the rotating support includes a support body with the long hole provided in the middle position and the cantilever arranged in a cantilevered manner, and the cantilever is located in the middle position of the support body.

[0025] The beneficial effect of the above technical solution is that the rotating support is a T-shaped structure, and the long hole and the cantilever are arranged in the middle position. When in use, the rotating support can be flipped 180° for use, with low requirements on the installation direction, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of a mechanical limiting device for a pressure relief protective cover according to the present invention;

[0027] Figure 2 It is a schematic cross-sectional view of the main view of the mechanical limiting device for the pressure relief protective cover of the present invention when in use;

[0028] Figure 3 A top view of the mechanical limiting device for the pressure relief protective cover of the present invention when in use;

[0029] Figure 4 It is a left side view of the mechanical limiting device for the pressure relief protective cover of the present invention;

[0030] Figure 5 Schematic diagram of the pressure relief process when the mechanical limit device for the pressure relief protective cover of the present invention is in use;

[0031] Figure 6 This is a schematic diagram of the mechanical limiting device for the pressure relief protective cover of the present invention after the pressure is released in place when in use.

[0032] In the figure: 1. Mounting base; 11. Support plate; 12. Ear plate; 2. Rotating support; 21. Support body; 22. Cantilever; 23. Threaded hole; 24. Long hole; 25. Bolt; 3. Pin; 4. Guide sleeve assembly; 41. Protective cover; 42. Guide sleeve; 43. Guide sleeve limiting fitting surface; 5. Limit block; 51. Limit block limiting fitting surface; 6. Foundation; 7. Set screw; 8. Press rod; 81. Convex ring; 9. Spring; 100. Pressure relief protective cover; 200. Pressure relief channel. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0035] It should be noted that relational terms such as "first" and "second" that may appear are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the phrase "including a..." do not exclude processes or methods that include the elements.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood in a broad sense. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The present invention is described in further detail below with reference to the examples.

[0039] Specific embodiments of the mechanical limiting device for the pressure relief protective cover provided by the present invention:

[0040] like Figure 1 and Figure 2 As shown, the mechanical limiting device for the pressure relief protective cover (hereinafter referred to as the limiting device) includes a mounting base 1 and a rotating support 2 mounted on the mounting base 1 via a pin 3. The mounting base 1 is fixedly mounted on a foundation 6 when in use, wherein the foundation 6 is located next to the pressure relief channel 200. In actual use, the foundation 6 here can be the outer wall of a warehouse or a special place. Figure 4 As shown, the mounting base 1 is fixedly mounted on the foundation 6 by means of bolts 25 .

[0041] The structure of the mounting base 1 is as follows Figure 1 and Figure 2 As shown, the mounting base 1 includes two support plates 11 arranged in parallel and spaced apart. The space between the two support plates 11 can accommodate the rotating support 2 for linear motion and flipping. The mounting base 1 also includes an ear plate 12 provided on one side of each support plate 11. If the spacing arrangement direction of the two support plates 11 is defined as the left-right direction, then the ear plate 12 is located on one side of the front-to-back direction of the support plate 11. Each ear plate 12 is provided with a threaded hole running through the front and back. The ear plate 12 can be integrally formed on the support plate 11, or it can be separately welded or threadedly connected to the support plate 11. The ends of the two support plates 11 are provided with a pin through-hole running through the left and right (not marked in the figure).

[0042] The structure of the rotating support 2 is as follows Figure 1 and Figure 2 As shown, the rotating support 2 is a T-shaped structure, including a support body 21 and a cantilever 22 located on one side of the support body 21 in the front-rear direction. The cantilever 22 is cantilevered on the support body 21. The cantilever 22 here is integrally formed with the support body 21, and in other embodiments, they can also be fixedly connected in parts. A threaded hole 23 is provided on the cantilever 22. When in use, the bolt is inserted into the threaded hole 23, and the pressure relief protective cover 100 is fixed to the cantilever 22. The threaded hole 23 here constitutes a connecting structure for connecting the pressure relief protective cover 100. A long hole 24 is provided on the support body 21, wherein, when the limit device is in Figure 2 In the state of the support body 21, the extension direction of the long hole 24 is consistent with the extension direction of the pressure relief channel 200. In this embodiment, the long hole 24 and the cantilever 22 are located in the middle position of the support body 21.

[0043] The rotating support 2 is mounted on the mounting base 1 via the pin 3. Specifically, the rotating support 2 is placed in the groove formed by the two support plates 11. The pin 3 passes through the pin hole of one support plate 11, the long hole 24, and the pin hole of the other support plate 11 in sequence, and is restricted by a cotter pin to prevent the pin 3 from falling out. The assembled structure is as follows: Figure 2 、 Figure 5 and Figure 6 As shown, when the pressure in a warehouse or special place is high, the gas pushes the pressure relief protective cover 100 to move in the pressure relief channel 200, and the pressure relief protective cover 100 pushes the rotating support 2 to move along the extension direction of the long hole 24. When the pin 3 is stopped by the hole wall of the long hole 24, the pressure relief protective cover 100 will rotate around the pin 3 under the action of inertia, driving the rotating support 2 to flip. The process is as follows Figure 5 and Figure 6 In actual production, the length of the long hole 24 needs to be reasonably set to ensure that when the pin 3 is engaged with the hole wall of the long hole 24, the pressure relief protective cover 100 is completely removed from the pressure relief channel 200.

[0044] To prevent the rotating support 2 from turning over and hitting nearby objects, and then turning over in the opposite direction. Figures 1 to 3 As shown, a guide sleeve assembly 4 is fixedly mounted on the two ear plates 12. Specifically, the guide sleeve assembly 4 includes a guide sleeve 42 fixedly mounted on the two ear plates 12 by bolts. A push rod 8 is slidingly mounted in the guide sleeve 42. The end of the push rod 8 facing the rotating support 2 passes through the guide sleeve 42, and a limit block 5 is fixedly mounted on this end. Specifically, the limit block 5 is sleeved on the outside of the push rod 8 and is fixed by a set screw 7 that radially penetrates the push rod 8. When the pressure relief protective cover 100 is located in the pressure relief channel 200, the limit block 5 is located between the two ear plates 12 in the left and right directions, and as shown in FIG. Figure 2 As shown, the limiting block 5 is located below the pin 3 , and the limiting block 5 can penetrate into the groove formed by the two support plates 11 .

[0045] like Figure 2 As shown, the guide sleeve assembly 4 also includes a protective cover 41, which is threadedly assembled on the guide sleeve 42, and a spring 9 is installed in the guide sleeve 42. A convex ring 81 is integrally formed on the push rod 8, and the convex ring 81 is located in the protective cover 41. The spring 9 is sleeved on the push rod 8 and is pressed between the convex ring 81 and the bottom wall of the protective cover 41. The spring 9 can apply an elastic force to the push rod 8 and the limit block 5 toward the rotating support 2.

[0046] The use process of the present invention is as follows: the pressure relief protection cover 100 of the pressure relief device is constrained in the pressure relief channel 200 under normal conditions, the rotating support 2 is connected to the pressure relief protection cover 100 as a whole by bolts, and the rotating support 2 is in Figure 5In the position shown, the force balance is in a static state under normal conditions, and the limit block 5 and the push rod 8 are pressed against the rotating support 2 by the spring 9. When the pressure relief protective cover 100 is opened under the set pressure and thrown upward along the pressure relief channel 200, the pressure relief protective cover 100 will drive the rotating support 2 to move upward. After the pressure relief protective cover 100 is separated from the pressure relief channel 200, it will continue to move upward under the action of inertia until the pin 3 is stopped by the hole wall at the bottom of the long hole 24. Under the action of inertia, the pressure relief protective cover 100 will rotate around the pin 3 as the center, driving the rotating support to rotate to the set angle (90° in this embodiment). During this process, the spring force accumulated in the spring 9 is released, and the limit block 5 is always pressed against the rotating support 2 through the push rod 8, and is pushed forward with the rotation of the rotating support 2, causing the limit block 5 to penetrate into the space formed by the two support plates 11. When the rotating support 2 rotates to Figure 6 In the state shown, the convex ring 81 is engaged with the end face of the guide sleeve 42 , and the limit block 5 and the guide sleeve 42 are respectively arranged at the front and rear sides of the pin shaft 3 .

[0047] In this embodiment, in order to keep the rotating support 2 Figure 6 In the state, the top of the guide sleeve 42 has a guide sleeve limit fitting surface 43, and the top of the limit block 5 has a limit block limit fitting surface 51. When the rotating support 2 rotates to Figure 6 When the state is in the state, the guide sleeve limiting fitting surface 43 and the limiting block limiting fitting surface 51 are both fitted with the bottom surface of the rotating support 2, preventing the rotating support 2 from continuing to rotate or rotating in the reverse direction, thereby maintaining Figure 6 status.

[0048] In this embodiment, when the limit block 5 is in Figure 2 In the state shown, the limit block 5 is pressed against the rotating support 2 by the spring 9. At this time, the limit block 5 is in the pressing position. Figure 6 In the state shown, the limit block 5 and the guide sleeve 42 are placed on both sides of the pin 3, and the limit surface of the limit block 5 (i.e., the limit block limit fitting surface 51) and the limit surface of the guide sleeve 42 (i.e., the guide sleeve limit fitting surface 43) together limit the rotating support 2 to prevent it from rotating. At this time, the limit block 5 is in the limit position. When the limit block 5 is in Figure 5 In the state shown, the limit block 5 switches from the top-pressing position to the limiting position, at which point the limit block 5 is in the intermediate position. The threaded hole 23 forms a connecting structure connecting the cantilever 22 and the pressure relief protective cover 100. The spring 9 constitutes an elastic member capable of applying elastic force to the limit block 5. In other embodiments, the elastic member may be a rubber block or other structure. The end surface of the guide sleeve 42 forms a stop that cooperates with the protruding ring 81 to limit the movement limit of the limit block 5.

[0049] In this embodiment, the rotating support 2 has a T-shaped structure, with the elongated hole 24 and the cantilever 22 both located in the middle of the support body 21. In other embodiments, the rotating support 2 may have an L-shaped structure, with the cantilever 22 located at one end of the support body 21. In this case, the elongated hole 24 may be replaced with a long slot with a closed bottom and an open top.

[0050] In this embodiment, each support plate 11 is provided with a protruding lug 12, the guide sleeve 42 is fixedly mounted on the two lugs 12, and the stopper 5 is located in the space between the two lugs 12. In other embodiments, the lug 12 is fixed to the end surface of the guide sleeve 42; alternatively, the end surface of the guide sleeve 42 is grooved, and the stopper 5 is disposed in the groove.

[0051] In this embodiment, the guide sleeve 42 is fixed on the mounting base 1. In other embodiments, the guide sleeve 42 can be fixed in other ways, for example, the guide sleeve 42 is directly fixed on the foundation 6, and it is only necessary to ensure that the guide sleeve 42 and the mounting base 1 are in a relatively fixed relationship.

[0052] In this embodiment, the connection structure is a threaded hole 23 provided on the cantilever 22. In other embodiments, the connection structure may be a bolt through-hole provided on the cantilever 22. In other embodiments, the pressure relief protective cover 100 may be directly welded to the cantilever 22. In this case, the connection structure of the cantilever 22 is the side surface of the cantilever 22.

[0053] In this embodiment, the mounting base 1 includes two support plates 11, and the rotating support 2 is located between the two support plates 11. In other embodiments, the mounting base 1 includes only one support plate, and the rotating support 2 is rotatably assembled on the support plate using the pin 3. In this case, when the rotating support 2 is flipped over, the limit block 5 is pushed to one side of the support plate.

[0054] In this embodiment, a long hole 24 is provided on the rotating support 2, and a pin shaft through hole is provided on the support plate 11. In other embodiments, a pin shaft through hole is provided on the rotating support 2, and a long hole 24 is provided on the support plate 11.

[0055] In this embodiment, the limit block 5 is sleeved on the push rod 8 and fastened with a set screw 7. In other embodiments, the limit block 5 is located at the end of the push rod 8 and fastened with an axially extending set screw 7. Of course, in other embodiments, the limit block 5 can be welded to the push rod 8.

[0056] In this embodiment, the guide sleeve 42 is threadedly assembled with the protective cover 41, the protruding ring 81 is located in the protective cover 41, the elastic member is pressed between the bottom wall of the protective cover 41 and the protruding ring 81, and the stop portion is the end face of the guide sleeve 42. In other embodiments, the stop portion may be an annular step provided in the guide sleeve 42. In other embodiments, the stop portion may be eliminated, and when the elasticity of the elastic member is fully released, the limit block 5 is pushed to the set position. In other embodiments, the protective cover 41 is eliminated, and one end of the elastic member is fixed to the pressing rod 8, and the other end is fixed to the guide sleeve 42.

[0057] In this embodiment, the rotation angle of the rotating support 2 is 90°, and the limiting surfaces of the limit block 5 and the guide sleeve 42 are located in the same plane. In other embodiments, when the rotation angle of the rotating support 2 is 45°, 60°, or other angles, the limiting surfaces of the limit block 5 and the guide sleeve 42 are correspondingly inclined surfaces, with the inclination angle being consistent with the rotation angle, and the limiting surface of the guide sleeve 42 is higher than the limiting surface of the limit block 5.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A mechanical limit device for a pressure relief protective cover, characterized in that: The invention comprises a mounting base (1) and a rotating support (2), wherein a long slot or a long hole (24) is provided on the mounting base (1) or the rotating support (2), and when the pressure relief device is not releasing pressure, the extending direction of the long slot or the long hole (24) is used to be consistent with the moving direction of the pressure relief protective cover (100) in the pressure relief channel (200); the rotating support (2) is slidably assembled on the mounting base (1) by a pin shaft (3) passing through the long slot or the long hole (24); the long slot or the long hole (24) The invention relates to a rotary support (2) having an inner wall for engaging with a pin shaft (3) to limit the movement limit of the pressure relief protective cover (100) when the pressure is released. After the pin shaft (3) engages with the inner wall, the rotary support (2) can rotate around the axis of the pin shaft (3). A cantilevered arm (22) is provided on one side of the rotary support (2). The cantilever arm (22) is provided with a connection structure for connecting with the pressure relief protective cover (100). The mechanical limiting device also includes a fixed arrangement relative to the mounting base (1). The guide sleeve (42) is located on the other side of the rotating support (2), and a push rod (8) is slidably mounted in the guide sleeve (42). A limit block (5) is fixed on one end of the push rod (8) facing the rotating support (2). The mechanical limit device also includes an elastic member that applies elastic force to the push rod (8) so that the limit block (5) is pressed against the rotating support (2); the limit block (5) has a position on the same side of the pin shaft (3) as the guide sleeve (42) and is elastically fixed. The member presses against the pressing position on the rotating seat, and also has a limiting position in which the rotating support (2) is pushed to the other side of the pin shaft (3) by the elastic member after the rotating support (2) rotates relative to the mounting base (1). The limiting block (5) and the guide sleeve (42) both have limiting surfaces that fit on the corresponding sides of the rotating support (2). When the limiting block (5) is in the limiting position, the limiting surfaces on the limiting block (5) and the guide sleeve (42) are respectively arranged on both sides of the pin shaft (3) to prevent the rotating support (2) from turning over.

2. The mechanical limiting device for the pressure relief protective cover according to claim 1, characterized in that: The rotation angle of the rotating support (2) is 90°, and the limiting surfaces of the limiting block (5) and the guide sleeve (42) are both planes extending along the moving direction of the push rod (8).

3. The mechanical limiting device for the pressure relief protective cover according to claim 2, characterized in that: The pressing rod (8) is provided with a convex ring (81), and the elastic member is used to press the convex ring (81) to apply elastic force to the limit block (5); the guide sleeve (42) is provided with a stop portion for cooperating with the convex ring (81) to limit the moving stroke of the limit block (5).

4. The mechanical limiting device for the pressure relief protective cover according to claim 3, characterized in that: The guide sleeve (42) is threadedly assembled with a protective cover (41), the convex ring (81) is located in the protective cover (41), the elastic member is pressed between the bottom wall of the protective cover (41) and the convex ring (81), and the stopper is the end face of the guide sleeve (42).

5. The mechanical limiting device for a pressure relief protective cover according to any one of claims 1 to 4, characterized in that: The limit block (5) is sleeved on the push rod (8), and the mechanical limit device further comprises a set screw (7) screwed into the push rod (8) to fix the limit block (5) on the push rod (8).

6. The mechanical limiting device for a pressure relief protective cover according to any one of claims 1 to 4, characterized in that: The mounting base (1) comprises two support plates (11) arranged at intervals along the axial direction of the pin shaft (3); the rotating support (2) is located between the two support plates (11); the pin shaft (3) passes through the rotating support (2) and the two support plates (11); and the limiting block (5) is used to penetrate or pass through the space formed by the two support plates (11).

7. The mechanical limiting device for the pressure relief protective cover according to claim 6, characterized in that: One side of the two support plates (11) is provided with an ear plate (12) protruding therefrom. The two ear plates (12) are arranged at intervals along the axial direction of the pin shaft (3). The guide sleeve (42) is fixed on the two ear plates (12). The limit block (5) located at the top pressure position is located between the two ear plates (12).

8. The mechanical limiting device for a pressure relief protective cover according to any one of claims 1 to 4, characterized in that: The connection structure is a threaded hole (23) or a bolt through hole provided on the cantilever (22).

9. The mechanical limiting device for a pressure relief protective cover according to any one of claims 1 to 4, characterized in that: The guide sleeve (42) is fixed on the mounting base (1).

10. The mechanical limiting device for a pressure relief protective cover according to any one of claims 1 to 4, characterized in that: The rotating support (2) is a T-shaped structure, comprising a support body (21) with the long hole (24) provided in the middle position and the cantilever (22) arranged in a cantilevered manner, wherein the cantilever (22) is located in the middle position of the support body (21).

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