A double-seal manhole door

Abstract

The utility model provides a kind of double-layer sealing manhole door, including cylinder, outer cover assembly and inner cover assembly, the inner end of cylinder is connected with inner flange, outer cover assembly includes outer hole cover, outer sealing strip and heat preservation layer, inner cover assembly includes inner hole cover, inner sealing strip and guide piece, the inner ring side of inner flange has the guide surface for guiding piece sliding contact.Such formation double-layer manhole door's structural form, by inner sealing strip and outer sealing strip form double-layer sealing system, prevent material into manhole cylinder, eliminate corrosive material to the corrosion of manhole, and heat preservation layer can solve the dew point corrosion problem caused by low temperature, play very good heat preservation effect;And outer hole cover, inner hole cover in closed state can be further adjusted position to better improve the sealing property, guide piece can assist the positioning accuracy of inner hole cover closed switching, improve sealing surface positioning;So operation manhole cylinder is air, does not contain corrosive gas, it is convenient to overhaul.

Description

Technical Field

[0001] This utility model relates to the field of manhole door technology, and in particular to a double-sealed manhole door. Background Technology

[0002] Activated carbon desulfurization and denitrification is a process that utilizes the adsorption and catalytic properties of activated carbon to remove sulfur dioxide (SO2) and nitrogen oxides (NOx) from flue gas. x Environmental protection technologies for desulfurization and denitrification often produce corrosive products during the removal process. Therefore, manhole doors are widely used in the field of activated carbon desulfurization and denitrification to achieve effects such as heat preservation and corrosion prevention.

[0003] Existing technologies typically employ single-layer maintenance manholes, whose opening procedures require system coordination and are relatively complex. Furthermore, manholes often suffer from leakage, corrosion, and perforation due to sealing failure, insufficient insulation, rainwater leakage, and frequent system start-ups and shutdowns. Additionally, the outer single-seal manhole accumulates dust and caking inside the hole after prolonged equipment operation, further complicating equipment maintenance and repair.

[0004] Therefore, it is necessary to propose a double-sealed manhole door to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a double-layer sealed manhole door to solve the problems of complex opening and poor sealing of the single-layer manhole door in the prior art.

[0006] To achieve the above objectives, this utility model provides a double-sealed manhole door, comprising a cylindrical body, an outer cover assembly, and an inner cover assembly, wherein an inner flange is connected to the inner end of the cylindrical body; wherein,

[0007] The outer cover assembly includes an outer hole cover, an outer sealing strip, and a heat insulation layer. The outer hole cover is closable and covers the outer end of the cylinder. When the outer hole cover is in the closed state, its position along the extension direction of the cylinder is adjustable. The outer sealing strip and the heat insulation layer are both connected to the side of the outer hole cover near the cylinder, and the heat insulation layer is disposed on the inner side of the outer sealing strip.

[0008] The inner cover assembly includes an inner bore cover, an inner sealing strip, and a guide member. The inner bore cover is closable and covers the inner end of the cylinder. When in the closed state, the inner bore cover is adjustable in position along the extension direction of the cylinder. A sealing groove is provided on the inner flange. The inner sealing strip is connected to the side of the inner bore cover near the cylinder to be engaged in the sealing groove. The guide member is connected to the side of the inner bore cover near the cylinder and is positioned near the inner sealing strip. The inner ring side of the inner flange has a guide surface for the guide member to slide in contact. The side wall surface of the guide member near the inner sealing strip is matched with the guide surface.

[0009] Preferably, the outer cover assembly further includes an outer cover pressure rod assembly, which includes an outer cover pressure rod and a connector, and connecting frames are respectively formed by outwardly protruding from both sides of the outer end of the cylinder; wherein,

[0010] The first end of the outer cover pressure rod is hinged to the connecting frame on the right side. The middle part of the outer hole cover is hinged to the outer cover pressure rod so as to be openable and closable around the first end of the outer cover pressure rod. The second end of the outer cover pressure rod is connected to the connecting frame on the left side through the connecting member.

[0011] Preferably, the inner cover assembly further includes two connecting rod assemblies disposed opposite each other along the height direction of the inner cover, each connecting rod assembly including a first connecting rod and a second connecting rod; wherein,

[0012] The first end of the first connecting rod is hinged to the left side of the inner end of the cylinder, the second end of the first connecting rod is hinged to the first end of the second connecting rod, and the second end of the second connecting rod is hinged to the right end of the inner hole cover so that the right end of the inner hole cover is openable and closable around the left side of the inner end of the cylinder.

[0013] Preferably, the inner cover assembly further includes an inner cover pressure rod assembly disposed between the two connecting rod assemblies. The inner cover pressure rod assembly includes an inner cover pressure rod, a screw, and a fastening handwheel. Two supports are respectively protruding from both sides of the inner middle portion of the cylinder. The supports are connected to the inner flange, and each support has a slot.

[0014] The fastening handwheel is threaded to one end of the screw, and the other end of the screw is fixedly connected to the inner hole cover. The inner cover pressure rod is sleeved on the middle of the screw, and both ends of the inner cover pressure rod are used to be engaged in the slot.

[0015] Preferably, the connector includes a hinge bolt and a handle nut, the second end of the outer cover pressure rod is connected to the connecting frame on the left side through the hinge bolt, and the handle nut is sleeved on the hinge bolt.

[0016] Preferably, the guide includes a plurality of guide wedges arranged circumferentially along the inner hole cover, the guide surface is inclined, and the side of the guide wedge facing the guide surface is inclined in a manner matching the guide surface.

[0017] Preferably, it further includes a limiting block, which is connected to the connecting frame on the right side and extends outward, and the limiting block is located inside the first end hinge point of the outer cover pressure rod.

[0018] Preferably, both the inner sealing strip and the outer sealing strip can be made of silicone rubber, nitrile rubber, or EPDM rubber.

[0019] Preferably, there are two sets of outer cover pressure rod assemblies, and the two sets of outer cover pressure rod assemblies are arranged opposite each other along the height direction of the outer cover.

[0020] Preferably, when the inner bore cover is in the closed state, a gap is reserved between the guide wedge and the inner flange.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This utility model provides a double-layer sealed manhole door, including a cylinder, an outer cover assembly, and an inner cover assembly. The inner end of the cylinder is connected to an inner flange. The outer cover assembly includes an outer hole cover, an outer sealing strip, and a heat insulation layer. The outer hole cover is closable and covers the outer end of the cylinder, and its position is adjustable along the extension direction of the cylinder when closed. The outer sealing strip and the heat insulation layer are both connected to the side of the outer hole cover near the cylinder. The inner cover assembly includes an inner hole cover, an inner sealing strip, and a guide. The inner hole cover is closable and covers the inner end of the cylinder, and its position is adjustable along the extension direction of the cylinder when closed. A sealing groove is provided on the inner flange. The inner sealing strip is connected to the side of the inner hole cover near the cylinder for engaging in the sealing groove. The guide is connected to the side of the inner hole cover near the cylinder and is located near the inner sealing strip. The inner ring side of the inner flange has a guide surface for sliding contact of the guide. The side wall surface of the guide near the sealing strip matches the guide surface. This double-layer manhole door structure, with an inner and outer sealing strip forming a double-sealing system, prevents materials from entering the manhole cylinder and eliminates corrosion from corrosive materials. The insulation layer also solves the problem of dew point corrosion caused by low temperatures, providing excellent thermal insulation. Both the outer and inner manhole covers can be further adjusted in the closed state to further improve sealing. The guide components assist in the positioning accuracy of the inner manhole cover during closure and switching, improving the positioning of the sealing surface. During operation, the manhole cylinder contains only air, free of corrosive gases, facilitating maintenance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of the closed state in one embodiment of the present invention;

[0025] Figure 2This is a schematic elevation view of the assembly of the outer cover component in one embodiment of the present utility model;

[0026] Figure 3 This is a schematic elevation view of the inner cover assembly in one embodiment of the present utility model;

[0027] Figure 4 This is a cross-sectional schematic diagram of the connecting rod assembly in one embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional schematic diagram of the inner cover pressure rod assembly in one embodiment of the present invention;

[0029] Figure 6 This is a partial schematic diagram of the guide member in one embodiment of the present invention.

[0030] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0031] Explanation of icon numbers:

[0032] 10. Cylinder body; 110. Inner flange; 111. Sealing groove; 120. Connecting frame; 130. Support; 131. Slot; 20. Outer cover assembly; 210. Outer hole cover; 220. Outer sealing strip; 230. Insulation layer; 240. Outer cover pressure rod assembly; 241. Outer cover pressure rod; 242. Hinged bolt; 243. Handle nut; 30. Inner cover assembly; 310. Inner hole cover; 320. Inner sealing strip; 330. Guide component; 331. Guide wedge; 340. Connecting rod assembly; 341. First connecting rod; 342. Second connecting rod; 350. Inner cover pressure rod assembly; 351. Inner cover pressure rod; 352. Screw; 353. Fastening handwheel. Detailed Implementation

[0033] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0037] Please see the appendix Figure 1-6 This utility model provides a double-layer sealed manhole door in one embodiment, comprising a cylindrical body 10, an outer cover assembly 20, and an inner cover assembly 30. An inner flange 110 is connected to the inner end of the cylindrical body 10. First, it should be noted that in this application, "inner" and "outer" refer to the inner door side and the outer door side (the inner door side is the area where the process is performed), while "left" and "right" are exemplified by the direction from the outer end towards the inner end. Please refer to the accompanying drawings for details. The specific technical solution is as follows:

[0038] The outer cover assembly 20 includes an outer hole cover 210, an outer sealing strip 220, and a heat insulation layer 230. The outer hole cover 210 is closable and covers the outer end of the cylinder 10. When closed, the outer hole cover 210 is adjustable in position along the extension direction of the cylinder 10. The outer sealing strip 220 and the heat insulation layer 230 are both connected to the side of the outer hole cover 210 near the cylinder 10, and the heat insulation layer 230 is disposed inside the outer sealing strip 220. The inner cover assembly 30 includes an inner hole cover 310, an inner sealing strip 320, and a guide member 330. The inner hole cover 310 is closable and covers the inner end of the cylinder 10. The inner bore cover 310, when in the closed state, is adjustable in position along the extension direction of the cylinder 10. The inner flange 110 has a sealing groove 111. The inner sealing strip 320 is connected to the inner bore cover 310 near the cylinder 10 to be engaged in the sealing groove 111. The guide member 330 is connected to the inner bore cover 310 near the cylinder 10 and is positioned near the inner sealing strip 320. The inner ring side of the inner flange 110 has a guide surface for the guide member 330 to slide in contact. The side wall surface of the guide member 330 near the inner sealing strip 320 is matched with the guide surface.

[0039] Specifically, the double-sealed manhole door in this application includes a cylinder 10, an outer cover assembly 20, and an inner cover assembly 30. The outer cover assembly 20 is responsible for the sealing management of the outer end of the cylinder 10. It includes an outer cover 210, an outer sealing strip 220, and a thermal insulation layer 230. The outer cover 210 is the outer manhole door, which is closable and located at the outer end of the cylinder 10. The outer sealing strip 220 is used to improve the sealing performance of the outer cover 210, and the thermal insulation layer 230 is used to improve the thermal insulation performance of the outer cover 210. When the outer cover 210 is in a closed state, the outer sealing strip 220 abuts against the outer end of the cylinder 10 and achieves sealing under compression. The thermal insulation layer 230 is located inside the outer sealing strip 220 to fill the inner side of the outer end of the cylinder 10 to achieve thermal insulation. At the same time, the outer cover 210 in the closed state can be further adjusted in position to strengthen the pressing effect and thus improve the sealing performance.

[0040] The inner cover assembly 30 is responsible for the sealing management of the inner end of the cylinder 10. It includes an inner hole cover 310, an inner sealing strip 320, and a guide 330. The inner hole cover 310 is an inner manhole door, which is closable at the inner end of the cylinder 10. The inner sealing strip 320 is used to improve the sealing performance of the inner hole cover 310. Since the inner end of the cylinder 10 is provided with an inner flange 110, a sealing groove 111 is provided on the inner flange 110 for the installation and placement of the inner sealing strip 320. When the inner hole cover 310 is rotated to the closed state, the inner sealing strip 320 is just... The inner hole cover 310 is fitted into the sealing groove 111 to achieve a seal. At the same time, the position of the inner hole cover 310 along the extension direction of the cylinder 10 can be further adjusted to strengthen the tightness and improve the sealing performance. In the switching state between the closed and open states, the guide member 330 can play an auxiliary positioning role. It has a guide surface for the guide member 330 to slide in contact. When the inner hole cover 310 is closed, the guide member 330 moves along the guide surface, which makes it easier for the inner sealing strip 320 to find the position of the sealing groove 111, so as to guide the inner hole cover 310 to close and achieve auxiliary positioning of the sealing surface.

[0041] In a preferred embodiment of the present invention, the outer cover assembly 20 further includes an outer cover pressure rod assembly 240, which includes an outer cover pressure rod 241 and a connector. Connecting frames 120 are respectively formed on both sides of the outer end of the cylinder 10. The first end of the outer cover pressure rod 241 is hinged to the connecting frame 120 on the right side. The middle part of the outer hole cover 210 is hinged to the outer cover pressure rod 241 so as to be openable and closable around the first end of the outer cover pressure rod 241. The second end of the outer cover pressure rod 241 is connected to the connecting frame 120 on the left side through the connector.

[0042] It should be noted that the outer cover pressure rod assembly 240 facilitates the operation and opening of the outer hole cover 210, and can also be used to adjust the position of the outer hole cover 210 along the extension direction of the cylinder 10. Specifically, it includes an outer cover pressure rod 241 and a connector. To facilitate the opening and closing of the outer hole cover 210, connecting frames 120 are formed protruding outward on both sides of the outer end of the cylinder 10. The connecting frame 120 on the right side is used to hinge the first end of the outer cover pressure rod 241, and the outer hole cover 210 is connected to the outer cover pressure rod 241. Thus, the outer cover pressure rod 241 is rotatably set around the hinge point of the right connecting frame 120 to drive the outer hole cover 210 to be opened and closed. The second end of the outer cover pressure rod 241 is connected to the connecting frame on the left side through the connector, so as to press the outer cover pressure rod 241 through the connector to change the pressing force, thereby adjusting the position of the outer hole cover 210 along the extension direction of the cylinder 10 to improve the sealing performance.

[0043] It is worth mentioning that the number of the outer cover pressure rod assembly 240 can be set to two sets. The two sets of the outer cover pressure rod assembly 240 are arranged opposite each other along the height direction of the outer hole cover 210 to adapt to the height of the outer hole cover 210 and ensure the uniformity of force during opening, closing and pressing.

[0044] In a preferred embodiment of the present invention, the inner cover assembly 30 further includes two connecting rod assemblies 340 arranged opposite each other along the height direction of the inner hole cover 310. Each connecting rod assembly 340 includes a first connecting rod 341 and a second connecting rod 342. The first end of the first connecting rod 341 is hinged to the left side of the inner end of the cylinder 10, the second end of the first connecting rod 341 is hinged to the first end of the second connecting rod 342, and the second end of the second connecting rod 342 is hinged to the right end of the inner hole cover 310 so that the right end of the inner hole cover 310 is openable and closable around the left side of the inner end of the cylinder 10.

[0045] It should be noted that the connecting rod assembly 340 is used to open / close the inner hole cover 310. It employs a first connecting rod 341 and a second connecting rod 342 working together. The first end of the first connecting rod 341 is hinged to the left side of the inner end of the cylinder 10, while the second end of the second connecting rod 342 is hinged to the right end of the inner hole cover 310. This allows the inner hole cover 310 to rotate around the hinge point on the left side of the inner end of the cylinder 10 under the interaction of the first connecting rod 341 and the second connecting rod 342. The second end of the first connecting rod 341 and the first end of the second connecting rod 342 need to be hinged together. When the inner hole cover 310 is in the closed state, the first connecting rod 341 and the second connecting rod 342 are connected in a bent state to adapt to the width of the cylinder 10. When the inner hole cover 310 is in the open state, the first connecting rod 341 and the second connecting rod 342 are in a straight state. In this way, the end of the inner hole cover 310 will not stop the inner flange 110 when rotating, achieving a maximum opening and closing angle of 90°.

[0046] In a preferred embodiment of the present invention, the inner cover assembly 30 further includes an inner cover pressure rod assembly 350 disposed between the two connecting rod assemblies 340. The inner cover pressure rod assembly 350 includes an inner cover pressure rod 351, a screw 352, and a fastening handwheel 353. Two supports 130 are respectively protruding from the middle of the inner end of the cylinder 10. The supports 130 are connected to the inner flange 110, and each support 130 is provided with a slot 131. The fastening handwheel 353 is threaded to one end of the screw 352, and the other end of the screw 352 is fixedly connected to the inner hole cover 310. The inner cover pressure rod 351 is sleeved on the middle of the screw 352, and both ends of the inner cover pressure rod 351 are used to be engaged in the slot 131.

[0047] It is worth noting that the inner cover pressure rod assembly 350 is used to adjust the position of the inner hole cover 310 along the extension direction of the cylinder 10. It includes an inner cover pressure rod 351, a screw 352, and a fastening handwheel 353. The two ends of the screw 352 are respectively connected to the inner hole cover 310 and the fastening handwheel 353. By rotating the fastening handwheel 353, the screw 352 moves back and forth, thereby achieving the compaction and release of the inner sealing surface. Since the inner cover pressure rod 351 is correspondingly set in the slot 131, the rotation of the inner cover pressure rod 351 is restricted by the slot 131, and the inner hole cover 310 cannot rotate either. When the fastening handwheel 353 is rotated, under the rotation action of the threaded connection, the inner cover pressure rod 351 will gradually press towards the inner hole cover 310 to compact the inner sealing strip 320 on the inner flange 110 surface, thereby enhancing the sealing performance of the inner sealing strip 320.

[0048] In a preferred embodiment of the present invention, the connector includes a hinge bolt 242 and a handle nut 243. The second end of the outer cover pressure rod 241 passes through the hinge bolt 242 to be connected to the connecting frame 120 on the left side. The handle nut 243 is sleeved on the hinge bolt 242.

[0049] It is worth noting that the head of the hinge bolt 242 is spherical with a hole. This design allows the bolt to be quickly aligned and inserted into the corresponding hole during installation, greatly improving installation efficiency. During disassembly, due to its spherical design, the bolt can be easily removed from the hole without complicated tools or operations, thus achieving the quick-opening characteristic of the manhole door and improving the opening and closing efficiency during maintenance. Tightening the handle nut 243 achieves the clamping effect of the outer cover pressure rod 241, thereby driving the outer hole cover 210 to be clamped. The handle nut 243 has an extended handle, which facilitates operation by technicians.

[0050] Furthermore, the guide member 330 includes a plurality of guide wedges 331 arranged circumferentially along the inner hole cover 310, the guide surface is inclined, and the guide wedges 331 are inclined to the side facing the guide surface in a manner that matches the guide surface.

[0051] It should be noted that the inner ring side (guide surface) of the inner flange 110 is designed with an inclined surface to facilitate the sliding contact of the inner bore cover 310 when it is closed. Therefore, the guide member 330 takes the form of a guide wedge 331, one side of which also has an inclined surface, so as to match the guide surface of the inner flange 110. Here, "matching" means that the inclined surfaces of the two are parallel to each other. In this way, the inner bore cover 310 can slide along the guide surface to close during the closing process, so as to achieve a better guiding effect and facilitate the auxiliary positioning of the sealing surface. Please refer to the appendix for details. Figure 6 .

[0052] Furthermore, it also includes a limiting block, which is connected to and extends out of the connecting frame 120 on the right side, and the limiting block is located inside the first end hinge point of the outer cover pressure rod 241.

[0053] It should be understood that since the outer hole cover 210 is hinged to the outer side of the outer end of the cylinder 10 (connecting brackets 120 protruding on both sides), there is no restriction on the rotation and flipping of the outer hole cover 210. In order to avoid damage caused by excessive flipping, the limiting block can be added and set inside the first end hinge point of the outer cover pressure rod 241, so that the outer hole cover 210 can achieve a maximum opening and closing angle of 180°.

[0054] Furthermore, both the inner sealing strip 320 and the outer sealing strip 220 can be made of silicone rubber, nitrile rubber, or EPDM rubber.

[0055] It should be noted that, in addition to good sealing performance, all three also have good high temperature resistance and corrosion resistance, making them suitable for the application scenarios described in this application. Those skilled in the art can select the specific type of use based on actual working conditions, material conditions, etc.

[0056] Furthermore, when the inner bore cover 310 is in the closed state, a gap is reserved between the guide wedge 331 on the inner bore cover 310 and the inner flange 110.

[0057] Understandably, this gap facilitates subsequent opening and avoids damage caused by long-term compression between the inner flange 110 and the guide wedge 331, thereby reducing maintenance and increasing the service life of the workpiece.

[0058] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A double-sealed manhole door, characterized in that, It includes a cylinder, an outer cover assembly, and an inner cover assembly, wherein the inner end of the cylinder is connected to an inner flange; wherein, The outer cover assembly includes an outer hole cover, an outer sealing strip, and a heat insulation layer. The outer hole cover is closable and covers the outer end of the cylinder. When the outer hole cover is in the closed state, its position along the extension direction of the cylinder is adjustable. The outer sealing strip and the heat insulation layer are both connected to the side of the outer hole cover near the cylinder, and the heat insulation layer is disposed on the inner side of the outer sealing strip. The inner cover assembly includes an inner bore cover, an inner sealing strip, and a guide member. The inner bore cover is closable and covers the inner end of the cylinder. When in the closed state, the inner bore cover is adjustable in position along the extension direction of the cylinder. A sealing groove is provided on the inner flange. The inner sealing strip is connected to the side of the inner bore cover near the cylinder to be engaged in the sealing groove. The guide member is connected to the side of the inner bore cover near the cylinder and is positioned near the inner sealing strip. The inner ring side of the inner flange has a guide surface for the guide member to slide in contact. The side wall surface of the guide member near the inner sealing strip is matched with the guide surface.

2. The double-sealed manhole door according to claim 1, characterized in that, The outer cover assembly further includes an outer cover pressure rod assembly, which includes an outer cover pressure rod and a connector. Connecting frames protrude outwards from both sides of the outer end of the cylinder. The first end of the outer cover pressure rod is hinged to the connecting frame on the right side. The middle part of the outer hole cover is hinged to the outer cover pressure rod so as to be openable and closable around the first end of the outer cover pressure rod. The second end of the outer cover pressure rod is connected to the connecting frame on the left side through the connecting member.

3. The double-sealed manhole door according to claim 1, characterized in that, The inner cover assembly further includes two connecting rod assemblies disposed opposite each other along the height direction of the inner cover, each connecting rod assembly including a first connecting rod and a second connecting rod; wherein... The first end of the first connecting rod is hinged to the left side of the inner end of the cylinder, the second end of the first connecting rod is hinged to the first end of the second connecting rod, and the second end of the second connecting rod is hinged to the right end of the inner hole cover so that the right end of the inner hole cover is openable and closable around the left side of the inner end of the cylinder.

4. The double-sealed manhole door according to claim 3, characterized in that, The inner cover assembly further includes an inner cover pressure rod assembly disposed between the two connecting rod assemblies. The inner cover pressure rod assembly includes an inner cover pressure rod, a screw, and a fastening handwheel. Two supports protrude from both sides of the inner middle portion of the cylinder, and these supports are connected to the inner flange. Each support has a slot. The fastening handwheel is threaded to one end of the screw, and the other end of the screw is fixedly connected to the inner hole cover. The inner cover pressure rod is sleeved on the middle of the screw, and both ends of the inner cover pressure rod are used to be engaged in the slot.

5. The double-sealed manhole door according to claim 2, characterized in that, The connector includes a hinge bolt and a handle nut. The second end of the outer cover pressure rod passes through the hinge bolt to be connected to the connecting frame on the left side. The handle nut is sleeved on the hinge bolt.

6. The double-sealed manhole door according to claim 1, characterized in that, The guide includes a plurality of guide wedges arranged circumferentially along the inner hole cover, the guide surface is inclined, and the side of the guide wedge facing the guide surface is inclined in a manner that matches the guide surface.

7. The double-sealed manhole door according to claim 2, characterized in that, It also includes a limiting block, which is connected to the connecting frame on the right side and extends outward, and the limiting block is located inside the first end hinge point of the outer cover pressure rod.

8. The double-sealed manhole door according to claim 1, characterized in that, Both the inner sealing strip and the outer sealing strip can be made of silicone rubber, nitrile rubber, or EPDM rubber.

9. The double-sealed manhole door according to claim 2, characterized in that, The number of outer cover pressure rod assemblies is two sets, and the two sets of outer cover pressure rod assemblies are arranged opposite each other along the height direction of the outer cover.

10. The double-sealed manhole door according to claim 6, characterized in that, When the inner bore cover is in the closed state, a gap is reserved between the guide wedge on the inner bore cover and the inner flange.

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