Manhole cover locking mechanism and manhole cover assembly

Abstract

The present application provides a manhole cover locking mechanism and a manhole cover assembly. The manhole cover locking mechanism includes a support member, a guiding member, and an elastic member. The support member includes a first support member, a second support member, and a positioning member. One end of the first support member is movably connected to the manhole cover, the other end of the first support member is movably connected to one end of the second support member, the other end of the second support member is movably connected to the wellbore, and the positioning member is arranged on the second support member. One end of the guiding member is connected to the first support member, the other end of the guiding member is connected to the second support member through the positioning member. The guiding member is provided with a guiding groove and a locking groove communicating with the guiding groove, and the positioning member slides between the guiding groove and the locking groove. One end of the elastic member is connected to the connection part between the first support member and the manhole cover, and the other end of the elastic member is connected to the guiding member. When the manhole cover is opened relative to the wellbore, under the action of the elastic member, the positioning member is locked in the locking groove, and the support member supports the manhole cover.

Description

Technical Field

[0001] The present application relates to the field of manhole covers, and particularly to a manhole cover locking mechanism and a manhole cover assembly for ground manhole covers. Background Art

[0002] The ground manhole cover is arranged above the ground wells for fire protection, water supply and drainage, cables, valves, etc. within the apron. Operators need to open the ground manhole cover of the apron for maintenance. The ground manhole cover is relatively heavy, and in related technologies, there is usually no auxiliary lifting device for the ground manhole cover, and multiple people are required to cooperate to open and close the ground manhole cover. Since the surrounding environment of the airport is open, the wind speed is high and lasts for a long time. In addition, affected by the aircraft airflow, the ground manhole cover of the apron needs to be firmly installed. In related technologies, the manhole cover assembly is prone to accidental closing in case of strong winds on the apron, accidental contact by personnel, collision, etc., and safety accidents such as workers being trapped in the well or being pinched by the manhole cover may occur, and the safety is not high. Summary of the Invention

[0003] The present application provides a manhole cover locking mechanism and a manhole cover assembly for locking the ground manhole cover of the apron with higher safety.

[0004] The present application provides a manhole cover locking mechanism, which is arranged on the ground manhole cover of the apron. The ground manhole cover of the apron includes a wellbore and a manhole cover arranged above the wellbore. The manhole cover is movably connected to the wellbore. The manhole cover locking mechanism includes:

[0005] A support member, including a first support member, a second support member and a positioning member. One end of the first support member is movably connected to the manhole cover, the other end of the first support member is movably connected to one end of the second support member, the other end of the second support member is movably connected to the wellbore, and the positioning member is arranged on the second support member;

[0006] A guiding member, one end of the guiding member is connected to the first support member, the other end of the guiding member is connected to the second support member through the positioning member. The guiding member is provided with a guiding groove and a locking groove communicated with the guiding groove. The positioning member slides between the guiding groove and the locking groove; and

[0007] An elastic member, one end of the elastic member is connected to the connection part between the first support member and the manhole cover, the other end of the elastic member is connected to the guiding member. When the manhole cover is opened relative to the wellbore, under the action of the elastic member, the positioning member is locked in the locking groove, and the support member supports the manhole cover.

[0008] Optionally, the guiding member includes a guiding part and a locking part intersecting with the guiding part. The locking part is arranged at one end of the guiding part close to the second support member and extends from the guiding part along the wellbore towards the manhole cover. The guiding part includes the guiding groove, and the locking part includes the locking groove.

[0009] Optionally, the guiding groove guides the positioning member in the extending direction of the guiding portion; the locking groove is engaged and locked with the positioning member in the extending direction of the locking portion and / or in the extending direction of the guiding portion.

[0010] Optionally, the guiding direction of the guiding groove and the guiding direction of the locking groove form a 90° angle therebetween.

[0011] Optionally, the connection portion between the guiding groove and the locking groove is arc-shaped.

[0012] Optionally, the positioning member is located at a position on the second support member relatively close to the first support member.

[0013] Optionally, the positioning member is located on the second support member, and the length range from the connection portion with the first support member is 20 mm - 25 mm.

[0014] Optionally, the positioning member and / or the guiding member is located on a side of the second support member relatively close to the outer side wall of the wellbore.

[0015] Optionally, the length of the first support member is less than the length of the second support member.

[0016] Optionally, the length range of the first support member is 40 mm - 50 mm.

[0017] Optionally, the length range of the second support member is 300 mm - 350 mm.

[0018] Optionally, one end of the guiding member connected to the first support member is located in the middle region of the first support member.

[0019] Optionally, when the manhole cover is opened relative to the wellbore, the angle range between the first support member and the second support member is 140° - 165°.

[0020] Optionally, one end of the elastic member connected to the guiding member is located in the middle region of the guiding member.

[0021] Optionally, the elastic member is a spring.

[0022] This application also provides a manhole cover assembly, including:

[0023] An apron manhole cover, including a wellbore and a manhole cover disposed above the wellbore, the manhole cover being movably connected to the wellbore; and

[0024] The manhole cover locking mechanism according to any one of the above embodiments, the manhole cover locking mechanism being disposed on the apron manhole cover.

[0025] The manhole cover locking mechanism provided by the embodiment of the present application includes a support member, a guide member, and an elastic member. The support member includes a first support member, a second support member, and a positioning member. One end of the first support member is movably connected to the manhole cover, the other end of the first support member is movably connected to one end of the second support member, the other end of the second support member is movably connected to the wellbore, and the positioning member is arranged on the second support member. One end of the guide member is connected to the first support member, the other end of the guide member is connected to the second support member through the positioning member. The guide member is provided with a guide groove and a locking groove communicating with the guide groove, and the positioning member slides between the guide groove and the locking groove. One end of the elastic member is connected to the connection part between the first support member and the manhole cover, the other end of the elastic member is connected to the guide member. When the manhole cover is opened relative to the wellbore, under the action of the elastic member, the positioning member is locked in the locking groove, and the support member supports the manhole cover. This manhole cover locking mechanism can effectively lock the manhole cover in case of strong winds on the apron, accidental touch by personnel, collision, etc., avoiding safety accidents such as accidental closing resulting in workers being trapped underground or pinched by the manhole cover, and has high safety.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and form a part of the present application, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0028] Figure 1 is a schematic structural diagram of an embodiment of the manhole cover assembly of the present application;

[0029] Figure 2 is Figure 1 a schematic structural diagram of a perspective of the manhole cover assembly shown;

[0030] Figure 3 is Figure 1 a schematic structural diagram of an embodiment of the assisting mechanism of the manhole cover assembly shown;

[0031] Figure 4 is Figure 3 a schematic structural diagram of a perspective of the assisting mechanism of the manhole cover assembly shown;

[0032] Figure 5 is Figure 3 a schematic structural diagram of another perspective of the assisting mechanism of the manhole cover assembly shown;

[0033] Figure 6 is Figure 3 a schematic structural diagram of yet another perspective of the assisting mechanism of the manhole cover assembly shown;

[0034] Figure 7 isFigure 3 Schematic structural diagram of a limiting member of the assisting mechanism of the manhole cover assembly shown;

[0035] Figure 8 is Figure 1 Schematic structural diagram of a perspective view when the second manhole cover of the manhole cover assembly is in the open state;

[0036] Figure 9 is Figure 1 Schematic structural diagram of another perspective view when the second manhole cover of the manhole cover assembly is in the open state;

[0037] Figure 10 is Figure 1 Schematic structural diagram of yet another perspective view when the second manhole cover of the manhole cover assembly is in the open state;

[0038] Figure 11 is Figure 1 Schematic structural diagram of the connection between the second manhole cover and the manhole cover locking mechanism of the manhole cover assembly shown;

[0039] Figure 12 is Figure 1 Schematic structural diagram of an embodiment of the manhole cover locking mechanism of the manhole cover assembly shown;

[0040] Figure 13 is Figure 1 Schematic structural diagram of an embodiment of the guiding member of the manhole cover locking mechanism of the manhole cover assembly shown;

[0041] Figure 14 is Figure 1 Schematic structural diagram of another perspective view of the manhole cover assembly shown;

[0042] Figure 15 is Figure 1 Schematic structural diagram of an embodiment of the hook failure opening device of the apron manhole cover of the manhole cover assembly shown.

[0043] Reference numerals:

[0044] 1. Apron manhole cover; 2. Boosting mechanism; 3. Manhole cover locking mechanism; 4. Anti-falling net; 5. Ladder; 6. Handrail; 7. Warning pole; 8. Hook failure opening device; 9. Manhole cover assembly; 10. Manhole cover; 11. Wellbore; 12. Support arm assembly; 13. Fixing component; 20. Torsion spring assembly; 21. Adjusting component; 22. Fixed frame; 23. Fixed main shaft; 24. Rotating shaft; 25. Fixed plate; 26. Partition board; 27. Spring damper; 30. Support piece; 31. Guide piece; 32. Elastic piece; 40. Protrusion; 70. First warning pole; 71. Second warning pole; 80. Clamping piece; 81. Auxiliary disassembly component; 100. First manhole cover; 101. Second manhole cover; 110. First side wall; 111. Second side wall; 112. Third side wall; 113. Fourth side wall; 121. First support arm; 122. Second support arm; 200. Torsion spring body; 201. First adjusting end; 202. Second adjusting end; 210. Limiting piece; 211. Adjusting piece; 212. Guide post; 213. Screw rod; 214. Through hole; 215. Guide opening; 216. Sliding groove; 217. Bottom wall; 218. First inner side wall; 219. Second inner side wall; 220. Pre-tightening piece; 221. First chute; 222. Second chute; 223. First frame; 224. Second frame; 225. First threaded hole; 230. Main shaft fixing part; 231. Main shaft connecting part; 240. Rotating part; 241. Sleeve; 242. Limit screw; 250. Limit groove; 260. Positioning groove; 300. First support piece; 301. Second support piece; 302. Positioning piece; 310. Guide groove; 311. Locking groove; 312. Guide part; 313. Locking part; 314. Positioning block; 700. First support rod; 701. Second support rod. Detailed implementation manners

[0045] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0046] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second" and similar words used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a limitation of quantity, but mean that there is at least one. "Plurality" or "several" means two or more. Unless otherwise indicated, words such as "front", "rear", "lower" and / or "upper" are for convenience of description only and are not limited to one position or a spatial orientation. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0047] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the" and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0048] This application provides a manhole cover locking mechanism provided on an apron manhole cover. The apron manhole cover includes a wellbore and a manhole cover provided above the wellbore, and the manhole cover is movably connected to the wellbore. The manhole cover locking mechanism includes a support member, a guide member and an elastic member. The support member includes a first support member, a second support member and a positioning member. One end of the first support member is movably connected to the manhole cover, the other end of the first support member is movably connected to one end of the second support member, the other end of the second support member is movably connected to the wellbore, and the positioning member is provided on the second support member. One end of the guide member is connected to the first support member, the other end of the guide member is connected to the second support member through the positioning member, the guide member is provided with a guide groove and a locking groove communicating with the guide groove, and the positioning member slides between the guide groove and the locking groove. One end of the elastic member is connected to the connection between the first support member and the manhole cover, the other end of the elastic member is connected to the guide member. When the manhole cover is opened relative to the wellbore, under the action of the elastic member, the positioning member is locked in the locking groove, and the support member supports the manhole cover.

[0049] The manhole cover locking mechanism of the embodiments of the present application can effectively lock the manhole cover in case of strong winds on the apron, accidental touch by personnel, collision, etc., avoiding safety accidents such as accidental closing leading to workers being trapped in the well or being pinched by the manhole cover, with high safety.

[0050] The present application provides a manhole cover locking mechanism and a manhole cover assembly. The manhole cover locking mechanism and the manhole cover assembly of the present application will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and implementation manners can be combined with each other without conflict.

[0051] Figure 1 It is a schematic structural diagram of an embodiment of the manhole cover assembly 9 of the present application. Figure 2 is Figure 1 A schematic structural diagram of a perspective view of the manhole cover assembly 9 shown. As Figure 1 and Figure 2 shown, the manhole cover assembly 9 includes an apron manhole cover 1, an assisting mechanism 2 and a manhole cover locking mechanism 3. Among them, the apron manhole cover 1 includes a manhole cover 10 and a wellbore 11 provided below the manhole cover 10. The manhole cover 10 is movably connected to the wellbore 11. The assisting mechanism 2 is detachably assembled in the wellbore 11 and is connected to the manhole cover 10. The assisting mechanism 2 is used to assist in opening or closing the manhole cover 10. The manhole cover locking mechanism 3 is provided on the apron manhole cover 1, and the manhole cover locking mechanism 3 is used to lock the manhole cover 10 when the manhole cover 10 is fully opened to prevent the manhole cover 10 from accidentally closing.

[0052] In Figure 1In the illustrated embodiment, the manhole cover 10 includes a first manhole cover 100 and a second manhole cover 101, and the first manhole cover 100 and the second manhole cover 101 are respectively assembled above the wellbore 11. The first manhole cover 100 is fixed above the wellbore 11. The second manhole cover 101 is movably connected to the first manhole cover 100 and is located above the wellbore 11. In this embodiment, the cross-sectional area of the first manhole cover 100 is smaller than that of the second manhole cover 101. The second manhole cover 101 can be opened relative to the first manhole cover 100. The boosting mechanism 2 is detachably assembled in the wellbore 11 and is located below the first manhole cover 100. The second manhole cover 101 is removed from the wellbore 11, the boosting mechanism 2 is assembled into the wellbore 11 from top to bottom, and the second manhole cover 101 is assembled above the boosting mechanism 2. With such a setting, the boosting mechanism 2 is detachably assembled into the wellbore 11 from top to bottom. At this time, it is not necessary for the staff to enter the wellbore 11, and the replacement or maintenance can be completed outside the wellbore 11, which is convenient for disassembling or replacing or maintaining the boosting mechanism 2, reduces the difficulty and cost of maintenance or disassembly or replacement, and also improves the disassembly or replacement efficiency. The boosting mechanism 2 is movably connected to the second manhole cover 101 to assist in opening or closing the second manhole cover 101. One end of the manhole cover locking mechanism 3 extends into the wellbore 11 and is connected to the wellbore 11, and the other end of the manhole cover locking mechanism 3 is connected to the second manhole cover 101 to support the second manhole cover 101 and lock the second manhole cover 101 to prevent the second manhole cover 101 from accidentally closing.

[0053] In Figure 1 and Figure 2 In the illustrated embodiment, the manhole cover assembly 9 further includes a support arm assembly 12, and the support arm assembly 12 is used to connect the wellbore 11, the second manhole cover 101 and the boosting mechanism 2. In some embodiments, the support arm assembly 12 includes a first support arm 121 and a plurality of second support arms 122, and the first support arm 121 and the second support arms 122 are in a strip structure. One end of the first support arm 121 extends into the wellbore 11 and is connected to the boosting mechanism 2, and the other end of the first support arm 121 is connected to the second manhole cover 101. One end of the second support arm 122 extends into the wellbore 11 and is movably connected to the wellbore 11, and the other end of the second support arm 122 is connected to the first manhole cover 100. The first support arm 121 and the second support arms 122 together serve to support the second manhole cover 101. Among them, a plurality of second support arms 122 are located outside the first support arm 121, so as to provide a balanced supporting force to support the second manhole cover 101. On this basis, the first support arm 121 assists the plurality of second support arms 122 under the action of the boosting mechanism 2 to open or close the second manhole cover 101. By setting the first support arm 121 to be connected to the boosting mechanism 2, the first support arm 121 assists the plurality of second support arms 122 under the action of the boosting mechanism 2 to provide a supporting force for the opening and closing of the second manhole cover 101, and can slowly close when closing the second manhole cover 101, and can provide a buffer for the concrete around the manhole cover 10.

[0054] In this embodiment, there are two second support arms 122. One end of each of the two second support arms 122 extends into the wellbore 11 and is movably connected to the wellbore 11 respectively, and the other end is fixedly connected to the second manhole cover 101. The first support arm 121 is located between the two second support arms 122, thus providing balanced supporting force to support the second manhole cover 101. One end of the first support arm 121 extends into the wellbore 11 and is movably connected to the assisting mechanism 2, and the other end is fixedly connected to the second manhole cover 101. When the second manhole cover 101 is opened, one end of the second support arm 122 moves from inside the wellbore 11 to the upper part of the wellbore 11 along with the opening of the second manhole cover 101. One end of the first support arm 121 is pushed by the assisting mechanism 2, providing assistance for opening the second manhole cover 101. When the second manhole cover 101 is closed, one end of the second support arm 122 moves from the upper part of the wellbore 11 to inside the wellbore 11 along with the closing of the second manhole cover 101. The first support arm 121 is supported by the assisting mechanism 2, providing buffering for closing the second manhole cover 101.

[0055] In this embodiment, the manhole cover 10 (the first manhole cover 100 and the second manhole cover 101) is made of 7075-T6 aluminum alloy, ensuring that the load-bearing capacity of the manhole cover 10 is sufficient to bear the wheel pressure weight of the largest aircraft. The manhole cover 10 is square. Compared with the circular manhole cover in the related art, the structure is more complex and is superior in terms of operation safety, portability, maintainability, etc. However, while the square structure is complex, its own weight increases. Therefore, the assisting mechanism 2 is designed. The assisting mechanism 2 is respectively connected to the manhole cover 10 and the wellbore 11 through the support arm assembly 12, providing supporting force for the operator to open and close the second manhole cover 101, improving the work efficiency, and being able to close slowly when closing the second manhole cover 101, providing buffering for the concrete around the manhole cover 10.

[0056] Figure 3 For Figure 1 The structural schematic diagram of an embodiment of the assisting mechanism 2 of the manhole cover assembly 9 shown. Figure 4 Is Figure 3 The structural schematic diagram of a perspective view of the assisting mechanism 2 of the manhole cover assembly 9 shown.

[0057] Figure 5 Is Figure 3 The structural schematic diagram of another perspective view of the assisting mechanism 2 of the manhole cover assembly 9 shown.

[0058] Figure 6 Is Figure 3 The structural schematic diagram of still another perspective view of the assisting mechanism 2 of the manhole cover assembly 9 shown.

[0059] Figure 7 Is Figure 3 The structural schematic diagram of an embodiment of the limiting member of the assisting mechanism 2 of the manhole cover assembly 9 shown. Combined withFigures 1 to 7 As shown in the figure, the assisting mechanism 2 includes a fixing component 13, a torsion spring component 20, and an adjusting component 21. The fixing component 13 is used to fix the torsion spring component 20. The adjusting component 21 is used to adjust the pre-tightening force of the torsion spring component 20. Since the weight and volume of the apron manhole cover 1 are relatively large, by providing the assisting mechanism 2, it provides a supporting force for the operator to open and close the second manhole cover 101, improves work efficiency, and can slowly close when closing the second manhole cover 101, providing a buffer for the concrete around the manhole cover 10. And by adjusting the pre-tightening force of the torsion spring component 20 through the adjusting component 21, the service life of the torsion spring component 20 can be extended and costs can be saved.

[0060] In Figures 2 to 6 In the illustrated embodiment, the fixing component 13 includes a fixing frame 22, a fixing main shaft 23 detachably assembled to the fixing frame 22, and a rotating shaft 24. The fixing frame 22 is located below the first manhole cover 100. The torsion spring component 20 is sleeved on the fixing main shaft 23 and detachably assembled to the fixing frame 22 as a whole. With such a setting, the torsion spring component 20 is sleeved on the fixing main shaft 23 and detachably assembled to the fixing frame 22 as a whole, which is convenient for replacing or maintaining the torsion spring component 20 and reduces the replacement or maintenance cost. One end of the first support arm 121 is connected to the rotating shaft 24. When the second manhole cover 101 is opened relative to the wellbore 11, the second manhole cover 101 drives the first support arm 121 to rotate synchronously with the rotating shaft 24. With such a setting, a supporting force can be provided when opening the second manhole cover 101. When closing the second manhole cover 101, a buffering force can be provided.

[0061] In Figures 3 to 6 In the illustrated embodiment, the fixing frame 22 includes two first frames 223 extending along the first direction X1 and two second frames 224 extending along the second direction X2. The first direction X1 and the second direction X2 intersect and are perpendicular. The fixing main shaft 23 and the rotating shaft 24 both extend along the first direction X1 and are assembled between the two second frames 224. The fixing main shaft 23 and the rotating shaft 24 are spaced apart in the second direction X2. The two first frames 223 and the two second frames 224 are connected to each other to enclose a frame structure with an upper and lower through interior. The fixing main shaft 23 can be assembled from above the fixing frame 22 from top to bottom, and the rotating shaft 24 can be assembled from below the fixing frame 22 from bottom to top.

[0062] In Figures 3 to 5In the illustrated embodiment, the torsion spring assembly 20 includes a torsion spring body 200 and a first adjustment end 201 and a second adjustment end 202 connected to both ends of the torsion spring body 200. The torsion spring body 200, the first adjustment end 201, and the second adjustment end 202 are of an integral structure, wherein the first adjustment end 201 and the second adjustment end 202 extend downward from both ends of the torsion spring body 200. In some embodiments, the number of the torsion spring assemblies 20 can be set to one or more than one. In this embodiment, the number of the torsion spring assemblies 20 is set to three groups. The first adjustment ends 201 at both ends of the torsion spring body 200 of the three groups of torsion spring assemblies 20 extend downward and toward the direction of the rotation shaft 24. The first adjustment ends 201 of the torsion spring assemblies 20 on both sides are arranged at one end close to the first frame 223, and there is no restriction on the position of the first adjustment end 201 of the middle torsion spring assembly 20.

[0063] In Figure 2 , Figures 4 to 7 the illustrated embodiment, the boosting mechanism 2 further includes an adjustment assembly 21. The adjustment assembly 21 is assembled at the bottom of the fixed frame 22 and is located in the wellbore 11. The adjustment assembly 21 is arranged at the bottom of the torsion spring assembly 20 and the fixed main shaft 23. The adjustment assembly 21 includes a limiting member 210 and an adjusting member 211 connected to the limiting member 210. The limiting member 210 is used for limit connection with the torsion spring assembly 20. The adjusting member 211 is used for adjusting the pre-tightening force of the torsion spring assembly 20. In this embodiment, the first adjustment end 201 extends downward into the wellbore 11 and abuts against the rotation shaft 24, and the second adjustment end 202 extends downward into the wellbore 11 and is in limit fit with the limiting member 210. The adjusting member 211 drives the limiting member 210 to move, so that the limiting member 210 drives the second adjustment end 202 to rotate around the fixed main shaft 23 and toward the direction close to the torsion spring body 200 to tighten the pre-tightening force of the torsion spring assembly 20. By adjusting the adjusting member 211, the limiting member 210 is driven to move, so that the limiting member 210 drives the second adjustment end 202 to rotate around the fixed main shaft 23 and toward the direction close to the torsion spring body 200 to tighten the pre-tightening force of the torsion spring assembly 20. In this way, the torsion force of the torsion spring assembly 20 is tightened, and the service life of the torsion spring assembly 20 is prolonged. And it provides a supporting force for the operator to open and close the second manhole cover 101, improves the work efficiency, and can be slowly closed when closing the second manhole cover 101, and can provide a buffer for the concrete around the manhole cover 10.

[0064] In Figures 4 to 6In the illustrated embodiment, one end of the limiting member 210 abuts against the first frame 223. The first frame 223 near the second adjustment end 202 is provided with a through first threaded hole 225. The limiting member 210 is provided with a second threaded hole (not shown) along the second direction X2. The adjusting member 211 includes a screw rod 213. One end of the screw rod 213 passes through the first threaded hole 225 and is connected to the second threaded hole, being threadedly connected to the limiting member 210. The other end of the screw rod 213 is a free end for adjustment. In this embodiment, by rotating the adjusting screw rod 213 around its own axis, the limiting member 210 is driven to move along the axis of the screw rod 213, thereby driving the second adjustment end 202 to rotate around the fixed main shaft 23 and towards the direction close to the torsion spring body 200 to tighten the pre-tightening force of the torsion spring assembly 20. In this embodiment, the axis of the screw rod 213 is the extending direction of the second direction X2. With such a setting, by adjusting the screw rod 213, the rotational movement of the screw rod 213 around its axis is converted into a linear movement of the limiting member 210 along the axis of the screw rod 213, thereby driving the second adjustment end 202 to rotate towards the direction close to the torsion spring body 200 to tighten its torsion spring force. The number of components is small and the adjustment method is simple, thus making the whole structure compact and having a small volume.

[0065] In Figures 4 to 7 In the illustrated embodiment, the limiting member 210 includes a through hole 214. The second adjustment end 202 is inserted into the through hole 214 from top to bottom. The second adjustment end 202 is connected to the limiting member 210 through an axial hole, which is convenient for disassembly or assembly on the one hand and convenient for adjustment on the other hand. The limiting member 210 is provided with a through guiding opening 215. The adjusting assembly 21 includes a guiding column 212. The guiding column 212 is inserted into the guiding opening 215 and is connected to the bottom of the fixed frame 22. The guiding opening 215 is arranged facing away from the bottom of the fixed frame 22 to fix the adjusting member 211 to the fixed frame 22. The guiding column 212 is used to limit the position of the screw rod 213. When the torsion spring assembly 20 is fatigued, use a hex wrench to adjust the screw rod 213, driving the limiting member 210 to move along the axis X1 of the screw rod 213 towards the direction away from the second well cover 101, thereby driving the second adjustment end 202 to rotate around the fixed main shaft 23 and towards the direction close to the torsion spring body 200 until the purpose of adjusting the boost is achieved, avoiding the deterioration of the boost effect caused by the long-term stress and fatigue of the torsion spring assembly 20. When the torsion spring assembly 20 fails, the torsion spring assembly 20 can be replaced and adjusted according to the above method to tighten the pre-tightening force of the torsion spring assembly 20.

[0066] In Figure 2 and Figure 4In an embodiment, the fixed frame 22 includes a pre-tightening member 220. The pre-tightening member 220 is disposed inside the fixed frame 22 and is closer to the fixed main shaft 23 than the rotary shaft 24 in the radial direction of the fixed main shaft 23. The pre-tightening member 220 has the same extending direction as the first frame 223. The first adjusting end 201 extends downward into the wellbore 11. The first adjusting end 201 is located at the bottom of the pre-tightening member 220 and abuts against the pre-tightening member 220, so that the first adjusting end 201 is located below the rotary shaft 24 and abuts against the rotary shaft 24 at the same time. With such a setting, the pre-tightening member 220 can perform pre-limiting on the first adjusting end 201. In Figure 2 In the shown embodiment, the rotary shaft 24 includes a plurality of rotating members 240 and a sleeve 241. The plurality of rotating members 240 are connected to each other through the sleeve 241 and are connected to the first support arm 121 by shaft holes. The sleeve 241 and the plurality of rotating members 240 are connected by limit screws 242. With such a setting, it is convenient for disassembly. The torsion spring body 200 is supported by abutting against the rotary shaft 24 through the first adjusting end 201. When disassembling the torsion spring assembly 20 of the disassembly assisting mechanism 2, it is necessary to disassemble the pre-tightening member 220 and the sleeve 241 and the plurality of rotating members 240 of the rotary shaft 24 to relieve the force on the first adjusting end 201. When installing the torsion spring assembly 20 of the assisting mechanism 2, it is necessary to install the pre-tightening member 220 and abut it against the first adjusting end 201 before installing the rotary shaft 24, which can enhance the reliability and tightness of the connection and prevent the first adjusting end 201 from directly abutting against the rotary shaft 24 to generate relative sliding.

[0067] In some embodiments, a plurality of torsion spring assemblies 20 are provided. Combining Figure 3 and Figure 6 As shown, the fixing assembly 13 further includes a fixing plate 25. The fixing plate 25 is assembled to the fixed frame 22 and is located between two adjacent torsion spring assemblies 20. The fixing plate 25 has a plate-like structure and extends along the second direction X2. A plurality of fixing plates 25 are evenly spaced along the first direction X1. The fixing plate 25 is provided with a limiting groove 250 upward. The torsion spring assembly 20 is assembled to the fixed main shaft 23 and is detachably assembled into the limiting groove 250 as a whole. In this embodiment, the fixing plate 25 is inserted between the two first frames 223 of the fixed frame 22 for fixing the plurality of torsion spring assemblies 20 and the fixed main shaft 23 to the fixed frame 22. The fixing plate 25 is used to limit the displacement of the torsion spring assembly 20 in the first direction X1. In this embodiment, the adjusting assembly 21 is fixed to the side of the fixing plate 25 facing the wellbore 11, and the adjusting member 211 is closer to the second manhole cover 101 than the limiting member 210 in the radial direction of the fixed main shaft 23. With such a setting, it is convenient for the operator to perform adjustment, replacement or maintenance in the wellbore 11.

[0068] In Figures 3 to 6In the illustrated embodiment, the fixing assembly 13 further includes a partition plate 26. The partition plate 26 is assembled at the limiting groove 250 of the fixing plate 25. The partition plate 26 limits the fixing main shaft 23 within the limiting groove 250 to separate the torsion spring assembly 20. The partition plate 26 functions to fix the torsion spring assembly 20. The partition plate 26 is detachably assembled within the limiting groove 250, facilitating the disassembly or replacement of the torsion spring assembly 20.

[0069] In Figures 3 to 6 In the illustrated embodiment, the edge of the partition plate 26 is provided with a notch. The partition plate 26 is inserted at the limiting groove 250. A positioning groove 260 is formed between the edge of the partition plate 26 and the side wall of the limiting groove 250. The two sides of the fixing frame 22 are provided with the positioning groove 260. A limiting block (located on the lower surface of the first manhole cover 100 and not shown) protrudes from the surface of the first manhole cover 100 facing the wellbore 11. When the first manhole cover 100 covers the wellbore 11, the limiting block and the positioning groove 260 are in limiting cooperation in the up and down directions, limiting the boosting mechanism 2 within the wellbore 11. Through the limiting block provided on the lower surface of the first manhole cover 100, the detachable partition plate 26 is limited up and down by the limiting groove 250 and the positioning groove 260. At the same time, it prevents the fixing main shaft 23 from moving up and down in the fixing frame 22. On the one hand, it is convenient for disassembly, and on the other hand, the fixing is simple, stable and reliable. In this embodiment, the side wall of the partition plate 26 is provided with a limiting groove (not shown) extending downward from top to bottom, and the side wall of the limiting groove 250 is provided with a limiting protrusion (not shown) extending downward from top to bottom and matching the limiting groove 250. The partition plate 26 is assembled with the limiting groove 250 of the fixing plate 25 through the limiting cooperation between the limiting protrusion and the limiting groove. With such a setting, this kind of insertion method has a simple structure and better fixing effect.

[0070] In Figures 4 to 7 In the illustrated embodiment, the limiting member 210 in the adjusting assembly 21 is fixed to the side of the fixing plate 25 facing the wellbore 11. A sliding groove 216 is provided on the side of the limiting member 210 facing the fixing plate 25. The sliding groove 216 extends along the second direction X2 and is assembled with the fixing plate 25 in a clamping manner. The sliding groove 216 includes a bottom wall 217 and a first inner side wall 218 and a second inner side wall 219 provided on the bottom wall. The two side walls of the fixing plate 25 are clamped between the first inner side wall 218 and the second inner side wall 219, and the bottom of the fixing plate 25 is attached to the bottom wall 217. With such a setting, the limiting member 210 is slidably assembled with the fixing plate 25 through the sliding groove 216. When the operator adjusts the screw 213, the limiting member 210 moves along the sliding groove 216 in a direction away from the second manhole cover 101, thereby driving the second adjusting end 202 to rotate around the fixing main shaft 23 and towards the direction close to the torsion spring body 200 until the purpose of adjusting the boost is achieved. This method is simple and reliable.

[0071] In Figure 2In the illustrated embodiment, the fixed main shaft 23 deviates from the central region of the second frame 224 and is disposed on one side close to the stopper 210 in the second direction X2. The length of the first adjustment end 201 is greater than that of the second adjustment end 202. The rotating shaft 24 abuts against one end of the first adjustment end 201 away from the stopper 210, and the opening and closing of the second manhole cover 101 drives the first adjustment end 201 to rotate by a larger angle. Such an arrangement can provide greater assistance for opening the second manhole cover 101. In Figure 6 In the illustrated embodiment, the fixed main shaft 23 includes a main shaft fixing portion 230 and main shaft connecting portions 231 provided at both ends of the main shaft fixing portion 230. The spring assembly is sleeved on the main shaft fixing portion 230, and the cross-sectional area of the main shaft connecting portion 231 is smaller than that of the main shaft fixing portion 230. The main shaft fixing portion 230 is mainly used for installing the torsion spring assembly 20, and the main shaft fixing portion 230 is mainly used for installing on the second frame 224 of the fixed frame 22. First chutes 221 extending downward from top to bottom are provided on both sides of the fixed frame 22, and second chutes 222 extending from the fixed main shaft 23 toward the rotating shaft 24 in the radial direction of the fixed main shaft 23 are provided. The second chutes 222 communicate with the first chutes 221. When the torsion spring assembly 20 is assembled on the main shaft fixing portion 230, as a whole, it is installed on the fixed frame 22 from top to bottom through the first chutes 221 and slides in the second chutes 222 extending from the fixed main shaft 23 toward the rotating shaft 24 in the radial direction of the fixed main shaft 23, so that the main shaft connecting portion 231 is clamped in the second chutes 222. When replacing the torsion spring assembly 20, first remove the partition 26 provided above the main shaft connecting portion 231, and rotate and push out the fixed main shaft 23 and the torsion spring assembly 20 as a whole along the second chutes 222 and take them out from bottom to top along the first chutes 221. After sleeving the new torsion spring assembly 20 on the fixed main shaft 23, place the fixed main shaft 23 and the torsion spring assembly 20 as a whole into the first chutes 221 from top to bottom, and then push them along the second chutes 222 to one end away from the rotating shaft 24, ensuring that the first adjustment end 201 and the second adjustment end 202 of the torsion spring assembly 20 extend downward into the wellbore 11, and place the partition 26 to limit the main shaft connecting portion 231. The cross-sectional area of the main shaft fixing portion 230 is adapted to the sizes of the first chutes 221 and the second chutes 222, and setting the cross-sectional area of the main shaft connecting portion 231 to be smaller than that of the main shaft fixing portion 230 can make the sizes of the first chutes 221 and the second chutes 222 smaller, and make the stability better under the condition of ensuring installation. In Figures 4 to 6 In the illustrated embodiment, the boosting mechanism 2 further includes spring dampers 27, and the spring dampers 27 are respectively disposed outside both sides of the fixed frame 22. In Figure 6 In the illustrated embodiment, the spring dampers 27 are respectively disposed on the outer sides of the second frame 224, and the spring dampers 27 are devices for absorbing inertia after the second manhole cover 101 is opened.

[0072] Combined with Figures 1 to 7In the illustrated embodiment, when replacing the torsion spring assembly 20 of the boosting mechanism 2, first, use a hoisting device or manual labor to open the second manhole cover 101. The operator descends into the well, uses a hex wrench to remove the limit screw 242 on the sleeve 241, takes out the sleeve 241 and multiple rotating parts 240, and uses a leverage socket to remove the pre-tightening part 220. At this time, the second manhole cover 101 has been unloaded. Use an adjustable wrench to adjust the screw rod 213 to relax the torsion spring assembly 20, and remove the adjusting assembly 21 as a whole along the sliding groove 216. Use a hoisting device or manual labor to reset the second manhole cover 101. After using a socket wrench to remove the multiple screws for fixing the first manhole cover 100, take out the first manhole cover 100, remove the partition plate 26 provided above the main shaft connecting part 231, and rotate and push out the fixed main shaft 23 and the torsion spring assembly 20 as a whole along the second chute 222 and take them out upward along the first chute 221. After sleeving the new torsion spring assembly 20 on the fixed main shaft 23, place the fixed main shaft 23 and the torsion spring assembly 20 as a whole into the first chute 221 from top to bottom, and then push them along the second chute 222 to the end far from the rotating shaft 24, ensuring that the first adjusting end 201 and the second adjusting end 202 of the torsion spring assembly 20 extend downward into the wellbore 11, and place the partition plate 26 to limit the main shaft connecting part 231. Reset the first manhole cover 100 and use screws to fix the first manhole cover 100. Use a hoisting device or manual labor to open the second manhole cover 101, pass the second adjusting end 202 through the through hole 214 of the limiting part 210, and snap the adjusting assembly 21 as a whole along the sliding groove 216 onto the fixing plate 25. Use a leverage socket to install the pre-tightening part 220 inside the fixed frame 22 to limit the first adjusting end 201. Connect the rotating shaft 24 to the support arm assembly 12. Use an adjustable wrench to adjust the screw rod 213 to rotate around the axis of the screw rod 213, so as to drive the limiting part 210 connected to the screw rod 213, and make the limiting part 210 move away from the second manhole cover 101. The movement of the limiting part 210 drives the second adjusting end 202 to rotate around the fixed main shaft 23 and towards the direction close to the torsion spring body 200 to tighten the pre-tightening force of the torsion spring assembly 20, and complete the replacement of the torsion spring assembly 20 of the boosting mechanism 2. With such a setting, it is avoided that the boosting effect deteriorates due to the fatigue caused by the long-term stress of the torsion spring assembly 20. When the torsion spring assembly 20 fails, the torsion spring assembly 20 can be replaced, and the pre-tightening force of the torsion spring assembly 20 can be adjusted to be tightened according to the above method.

[0073] Figure 8 is Figure 1 A schematic structural view of a perspective when the second manhole cover 101 of the manhole cover assembly 9 shown is in an open state. Figure 9 is Figure 1 A schematic structural view of another perspective when the second manhole cover 101 of the manhole cover assembly 9 shown is in an open state. Figure 10 is Figure 1Schematic structural diagram of another perspective when the second manhole cover 101 of the shown manhole cover assembly 9 is in the open state. Figure 11 is Figure 1 Schematic structural diagram of the connection between the second manhole cover and the manhole cover locking mechanism of the shown manhole cover assembly. Figure 12 is Figure 1 Schematic structural diagram of an embodiment of the manhole cover locking mechanism 3 of the shown manhole cover assembly 9, Figure 13 is Figure 1 Schematic structural diagram of an embodiment of the guide member 31 of the manhole cover locking mechanism 3 of the shown manhole cover assembly 9. Combining Figures 1 to 2 、 Figures 8 to 13 As shown, when the second manhole cover 101 is opened, the manhole cover locking mechanism 3, on the one hand, supports the second manhole cover 101, and on the other hand, locks and fixes the second manhole cover 101. The manhole cover locking mechanism 3 includes a support member 30, a guide member 31, and an elastic member 32. One end of the support member 30 extends into the wellbore 11 and is movably connected to the wellbore 11. The guide member 31 is provided on the support member 30, and the second manhole cover 101 is connected to the guide member 31. When the second manhole cover 101 is opened relative to the wellbore 11, under the action of the elastic member 32, the guide member 31 guides the support member 30 to support the second manhole cover 101. The support member 30 functions to support the second manhole cover 101. The elastic member 32 is used to provide elastic force, and under the action of the elastic member 32, the guide member 31 guides the support member 30 to expand and contract. The manhole cover locking mechanism 3 can effectively lock the second manhole cover 101 in the event of strong winds on the apron, accidental contact by personnel, collisions, etc., to avoid safety accidents such as accidental closing resulting in workers being trapped underground or being pinched by the manhole cover 10. The manhole cover locking mechanism 3 is closer to the edge of the wellbore 11 than the second support arm 122, facilitating operation by workers outside the wellbore 11 and preventing being trapped underground or pinched by the manhole cover 10 after unlocking the manhole cover locking mechanism 3, which is safe and reliable.

[0074] In Figures 8 to 12In the illustrated embodiment, the support member 30 and the guide member 31 form a linkage mechanism. The linkage mechanism has a simple structure, is convenient for telescoping, and has a small volume. The support member 30 includes a first support member 300, a second support member 301, and a positioning member 302. One end of the first support member 300 is movably connected to the second manhole cover 101, the other end of the first support member 300 is movably connected to one end of the second support member 301, and the other end of the second support member 301 is movably connected to the wellbore 11. The above-mentioned movable connection can be a movable connection by a connecting shaft, which is not limited in this application. The positioning member 302 is provided on the second support member 301. One end of the guide member 31 is connected to the first support member 300, and the other end of the guide member 31 is connected to the second support member 301 through the positioning member 302. The guide member 31 is provided with a guide groove 310 and a locking groove 311 communicating with the guide groove 310. The positioning member 302 slides between the guide groove 310 and the locking groove 311. The positioning member 302 is adapted to the guide groove 310 and the locking groove 311. One end of the elastic member 32 is connected to the connection between the first support member 300 and the second manhole cover 101, and the other end of the elastic member 32 is connected to the guide member 31. When the second manhole cover 101 is opened relative to the wellbore 11, under the action of the elastic member 32, the positioning member 302 is locked in the locking groove 311, and the support member 30 supports the second manhole cover 101. Combined with Figures 8 to 10 As shown, the process of the manhole cover locking mechanism 3 locking the second manhole cover 101 includes first opening the second manhole cover 101 relative to the first manhole cover 100. The positioning member 302 moves downward along the guide groove 310 of the guide portion 312. When the second manhole cover 101 is in the fully opened position, under the action of the elastic member 32, the guide member 31 moves in the direction of the elastic member 32, and the positioning member 302 slides from the guide groove 310 to the locking groove 311 of the locking portion 313. The positioning member 302 is locked. At this time, the second manhole cover 101 cannot be normally closed under external force conditions. The staff needs to manually reset the positioning member 302 from the locking groove 311 to the guide groove 310 before the second manhole cover 101 can be normally closed. Therefore, the manhole cover locking mechanism 3 can effectively lock the second manhole cover 101 in the event of strong winds on the apron, accidental contact by personnel, collisions, etc., to avoid safety accidents such as staff being trapped underground due to accidental closing or the manhole cover 10 being pinched. And during the above locking process, the first support member 300 and the second support member 301, the guide member 31 and the first support member 300, and the guide member 31 and the second support member 301 are in surface contact. The advantage of surface contact is that the pressure is small, the load-bearing capacity is large, and it is impact-resistant.

[0075] In Figures 12 to 13In the illustrated embodiment, the guide member 31 includes a guiding portion 312 and a locking portion 313 intersecting with the guiding portion 312. The guiding portion 312 serves as a guide, and the locking portion 313 serves as a lock. The locking portion 313 is provided at one end of the guiding portion 312 close to the second support member 301 and extends from the guiding portion 312 along the wellbore 11 towards the second manhole cover 101. With such a setting, the locking portion 313 is away from the second manhole cover 101, so that the positioning member 302 is limited to the locking portion 313, providing a locking force to the second manhole cover 101, which is stable and reliable. The guiding portion 312 includes a guiding groove 310, and the locking portion 313 includes a locking groove 311. The guiding groove 310 guides the positioning member 302 in the extending direction of the guiding portion 312. The locking groove 311 is engaged and locked with the positioning member 302 in the extending direction of the locking portion 313 and in the extending direction of the guiding portion 312. With such a setting, the locking portion 313 extends towards the second manhole cover 101, so that when the second manhole cover 101 is locked and an external force is applied to the outside of the second manhole cover 101, the positioning member 302 will not slide back into the guiding groove 310, and the safety is better.

[0076] In Figures 12 to 13 the illustrated embodiment, the guiding direction of the guiding groove 310 and the guiding direction of the locking groove 311 form a 90° angle. With such a setting, the positioning member 302 is locked in the locking groove 311 and is not easily disengaged from the locking groove 311 under the action of an external force, which is stable and reliable. In Figures 12 to 13 the illustrated embodiment, the connection between the guiding groove 310 and the locking groove 311 is arc-shaped. With such a setting, the guiding groove 310 and the locking groove 311 are arc-connected, which is beneficial for the positioning member 302 to slide into the locking groove 311 under the action of the elastic member 32. In Figures 12 to 13 the illustrated embodiment, the positioning member 302 is located at a position of the second support member 301 relatively close to the first support member 300. With such a setting, the length of the guide member 31 is prevented from being too large, thereby avoiding the angle between the first support member 300 and the second support member 301 being too small in the locked state, so that the positioning member 302 is disengaged from the locking groove 311 under the action of an external force, affecting the locking stability.

[0077] In Figures 12 to 13 the illustrated embodiment, the positioning member 302 is located on the second support member 301, and the length range from the connection with the first support member 300 is 20 mm - 25 mm. In some embodiments, the length of the positioning member 302 at the connection with the first support member 300 and the second support member 301 can be 20 mm or 21 mm or 22 mm or 23 mm or 24 mm or 25 mm. With such a setting, the position of the positioning member 302 is set appropriately, so that it can be switched between locking and unlocking freely while ensuring stable locking, and the length of the manhole cover locking mechanism 3 is small and the volume is smaller. In Figures 12 to 13In the illustrated embodiment, the positioning member 302 and the guiding member 31 are located on the side of the second support member 301 relatively closer to the outer wall of the wellbore 11. With such an arrangement, setting the positioning member 302 on the outside closer to the wellbore 11 facilitates the operation of the staff outside the wellbore 11, facilitates moving the positioning member 302 along the locking groove 311 to the guiding groove 310, and also facilitates unlocking the positioning member 302 from the locking groove 311, which is more conducive to the operation of the staff.

[0078] In Figures 12 to 13 In the illustrated embodiment, the length of the first support member 300 is less than the length of the second support member 301. Since the second support member 301 is located inside the wellbore 11 and is at a relatively far distance from the second manhole cover 101, setting the length of the second support member 301 to be greater than the length of the first support member 300 facilitates storage in the wellbore 11, and when the second manhole cover 101 is opened relative to the first manhole cover 100, the positioning member 302 is located above the first manhole cover 100, facilitating the operation of the staff. Moreover, it can also enable smooth switching between locking and unlocking, with stable and reliable locking and easy unlocking without effort. In some embodiments, the length range of the first support member 300 is 40 mm - 50 mm. In some embodiments, the length of the first support member 300 can be 40 mm or 42 mm or 44 mm or 46 mm or 48 mm or 50 mm. Setting the length of the first support member 300 appropriately enables stable and reliable locking and easy unlocking without effort, neither being too long nor too short. In some embodiments, the length range of the second support member 301 is 300 mm - 350 mm, and the length of the second support member 301 can be 310 mm or 320 mm or 330 mm or 340 mm or 350 mm. Setting the length of the second support member 301 appropriately enables stable and reliable locking and easy unlocking without effort, neither being too long nor too short.

[0079] In Figures 12 to 13 In the illustrated embodiment, the end of the guiding member 31 connected to the first support member 300 is located in the middle region of the first support member 300. In this embodiment, in combination with the length ratio relationship of the first support member 300, the length from the end of the guiding member 31 connected to the first support member 300 to the connection of the first support member 300 and the second support member 301 and the length from the positioning member 302 to the connection of the first support member 300 and the second support member 301 are relatively close. With such an arrangement, the locking can be stable and reliable, and at the same time, the unlocking is easy without effort. In some embodiments, when the second manhole cover 101 is opened relative to the wellbore 11, the angle range between the first support member 300 and the second support member 301 is 140° - 165°. In Figures 10 to 12In the illustrated embodiment, when the second manhole cover 101 is opened relative to the wellbore 11, the angles supported by the first support member 300 and the second support member 301 can be 140°, 145°, 150°, 155°, 160°, or 165°. With this arrangement, under the action of the elastic member 32, the first support member 300, the second support member 301, and the guide member 31 form a stable triangular structure, which has good locking stability and is conducive to unlocking, facilitating the operation of the operator. In Figures 11 to 12 In the illustrated embodiment, the elastic member 32 is a spring. It has a simple structure and stable elasticity. One end of the elastic member 32 is connected to the middle region of the guide member 31, and the other end of the elastic member 32 is connected to the connection between the first support member 300 and the second manhole cover 101. A positioning block 314 is provided in the middle region of the guide member 31 for fixing one end of the elastic member. In this embodiment, the elastic member 32 can be a flexible spring. One end of the spring is connected to the middle region of the guide member 31, and the other end of the spring is connected to the connection between the first support member 300 and the second manhole cover 101. A positioning block 314 is provided in the middle region of the guide member 31 for fixing one end of the spring. With this arrangement, by setting the length and position of the spring appropriately, the length of the spring can be minimized as much as possible while meeting the elastic force, which is convenient for storage and has a compact structure.

[0080] Figure 14 is Figure 1 A schematic structural view of another perspective of the manhole cover assembly shown. Combining Figures 1 to 2 and Figure 13 shown, the wellbore 11 includes a first side wall 110 and a second side wall 111 arranged oppositely, and a third side wall 112 and a fourth side wall 113 arranged oppositely. The first manhole cover 100 and the second manhole cover 101 are arranged in the direction in which the third side wall 112 extends towards the fourth side wall 113. The first side wall 110 and the second side wall 111 are distributed in the first direction X1. The third side wall 112 and the fourth side wall 113 are distributed in the second direction X2. The first manhole cover 100 covers the first side wall 110, the second side wall 111, and the third side wall 112 of the wellbore 11. The second manhole cover 101 covers the first side wall 110, the second side wall 111, and the fourth side wall 113 of the wellbore 11. The fourth side wall 113 is located on the side convenient for the operator to operate. The first side wall 110, the second side wall 111, the third side wall 112, and the fourth side wall 113 are connected to each other to enclose a wellbore 11 with a depth dimension. The operator can enter the wellbore 11 to perform operations.

[0081] In Figure 1 、 Figure 2 、 Figure 13In the illustrated embodiment, the manhole cover assembly further includes a fall prevention net 4 disposed within the wellbore 11. One side of the fall prevention net 4 is movably connected to the first sidewall 110, and the other end of the fall prevention net 4 is lapped on the second sidewall 111. In this embodiment, the fall prevention net 4 is in a grid shape. A protrusion 40 is provided above the fall prevention net on the first sidewall 110 of the wellbore 11 for lifting and vertically fixing one end of the fall prevention net 4 lapped on the second sidewall 111 to the protrusion 40 when the fall prevention net 4 is not needed. In this embodiment, the material used for the fall prevention net 4 is 6061-T4 aluminum alloy, and the fall prevention net 4 made of this material is characterized by light weight and high strength.

[0082] In Figure 1 , Figure 2 , Figure 14 In the illustrated embodiment, the manhole cover assembly further includes a ladder 5 assembled to the fourth sidewall 113. In this embodiment, it is hinged within the fourth sidewall 113 of the wellbore 11 by bolts, making full use of the space within the wellbore 11, with a compact layout and facilitating the work of staff to descend into the well. In Figure 14 In the illustrated embodiment, the manhole cover assembly further includes a plurality of handrails 6. The handrails 6 are U-shaped mechanisms and can be accommodated within the wellbore 11. One end of the handrails 6 is a free end, and the other end of the handrails 6 extends into the wellbore 11 and is fixed to the fourth sidewall 113. The section of the handrails 6 extending into the wellbore 11 is telescopic. When the second manhole cover 101 is opened, the end of the handrails 6 extending into the wellbore 11 extends, and the free end of the handrails 6 is lapped outside the wellbore 11. When the second manhole cover 101 is closed on the wellbore 11, the end of the handrails 6 extending into the wellbore 11 is retracted to accommodate the handrails 6 within the fourth sidewall 113. The handrails 6 are provided to assist the staff in descending into the well. In this embodiment, the handrails 6 can be painted with fluorescent yellow paint to ensure the reflective effect during night operations and further improve the operation safety.

[0083] Looking back again Figure 1 , in Figure 1In the illustrated embodiment, the manhole cover assembly further includes a plurality of warning rods 7, and the warning rod 7 includes a first warning rod 70 and a second warning rod 71 that are connected to each other. When the second manhole cover 101 is opened, the first warning rod 70 extends upward from the fourth side wall 113 to above the wellbore 11, and the second warning rod 71 extends from the top of the first warning rod 70 in the direction in which the third side wall 112 extends toward the fourth side wall 113 and overlaps with the lower surface of the second manhole cover 101. When the second manhole cover 101 is closed on the wellbore 11, the first warning rod 70 and the second warning rod 71 are folded and respectively received in the first side wall 110 and the second side wall 111. The first warning rod 70 and the second warning rod 71 are of a folding structure and can be received in the first side wall 110 and the second side wall 111 of the wellbore 11. Such a setting makes the layout compact. In this embodiment, the second warning rod 71 is a telescopic rod, and the second warning rod 71 includes a first rod 700 and a second rod 701. The first rod 700 is provided with a receiving cavity, and the receiving cavity is provided with an opening so that the second rod 701 is movably inserted into the receiving cavity through the opening. When the first warning rod 70 and the second warning rod 71 are folded, the second rod 701 is inserted into the receiving cavity of the first rod 700 to save space in the wellbore 11. The second warning rod 71 is provided with warning decorations, which are used to warn the outside when the staff works in the well, and the safety is better.

[0084] Figure 15 is Figure 1 A schematic structural diagram of an embodiment of the hook failure opening device 8 of the apron manhole cover 1 of the manhole cover assembly 9 shown. In Figure 1 and Figure 15 In the illustrated embodiment, the hook failure opening device 8 includes a clamping member 80 and an auxiliary disassembly assembly 81. The clamping member 80 is detachably connected to the lower surface of the second manhole cover 101, and the second manhole cover 101 is detachably assembled with the wellbore 11 through the clamping member 80. One end of the auxiliary disassembly assembly 81 is connected to the clamping member 80, and the other end of the auxiliary disassembly assembly 81 passes through the second manhole cover 101 and is exposed on the upper surface of the second manhole cover 101, and is detachably assembled with the upper surface of the second manhole cover 101. When the auxiliary disassembly assembly 81 is disassembled and separated from the upper surface of the second manhole cover 101, the clamping member 80 is driven to be disassembled from the wellbore 11 to open the second manhole cover 101. When it is difficult or impossible to open the apron manhole cover 1, the auxiliary disassembly assembly 81 can assist in opening the apron manhole cover 1. One end of the auxiliary disassembly assembly 81 is connected to the clamping member 80, and the other end passes through the second manhole cover 101 and is exposed on the upper surface of the second manhole cover 101, and is detachably assembled with the upper surface of the second manhole cover 101. In Figure 15In the illustrated embodiment, one end of the auxiliary disassembly component 81 is located on the lower surface of the second well cover 101 and is connected to the clamping component 80. The other end of the auxiliary disassembly component 81 is exposed on the upper surface of the second well cover 101 and is detachably assembled with the upper surface of the second well cover 101, facilitating operation by the staff to assist in opening the apron ground well cover 1. In Figure 15 In the illustrated embodiment, when auxiliary disassembly is not required, the auxiliary disassembly component 81 is assembled on the upper surface of the second well cover 101. When disassembly is required, the auxiliary disassembly component 81 is separated from the upper surface of the second well cover 101. When the auxiliary disassembly component 81 and the upper surface of the second well cover 101 are disassembled and separated, the clamping component 80 and the apron ground well are disassembled to open the second well cover 101. Thus, by disposing the other end of the auxiliary disassembly component 81 on the upper surface of the second well cover 101, that is, on the side facing the outside, it is convenient for the operator to operate the auxiliary disassembly component 81. In this embodiment, an external disassembly tool can be used to assemble the auxiliary disassembly component 81 on the upper surface of the second well cover 101 or disassemble it from the upper surface of the second well cover 101. The disassembly tool is not limited in this application.

[0085] By providing the auxiliary disassembly component 81, one end of the auxiliary disassembly component 81 is connected to the clamping component 80. The other end of the auxiliary disassembly component 81 passes through the second well cover 101 and is exposed on the upper surface of the second well cover 101, and is detachably assembled with the upper surface of the second well cover 101. In the situation where the second well cover 101 cannot be opened, the operator pulls the auxiliary disassembly component 81 to disassemble and separate the auxiliary disassembly component 81 from the upper surface of the second well cover 101, driving the clamping component 80 to disassemble from the apron ground well, thereby opening the second well cover 101. Thus, it is convenient for the staff to assist in opening the apron ground well cover 1 to solve the problem of difficult or impossible opening of the apron ground well cover.

[0086] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not claimed in the present application. The specification and embodiments are only to be considered as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0087] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims. The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A manhole cover locking mechanism is provided on the apron manhole cover. The apron manhole cover includes a wellbore and a manhole cover provided above the wellbore. The manhole cover is movably connected to the wellbore, and is characterized in that, The manhole cover locking mechanism includes: A support member, including a first support member, a second support member, and a positioning member. One end of the first support member is movably connected to the manhole cover, the other end of the first support member is movably connected to one end of the second support member, the other end of the second support member is movably connected to the wellbore, and the positioning member is provided on the second support member; A guiding member, one end of the guiding member is connected to the first support member, the other end of the guiding member is connected to the second support member through the positioning member. The guiding member includes a guiding portion and a locking portion intersecting with the guiding portion. The locking portion is provided at one end of the guiding portion close to the second support member and extends from the guiding portion along the wellbore towards the manhole cover. The guiding portion includes a guiding groove, the locking portion includes a locking groove communicating with the guiding groove, and the positioning member slides between the guiding groove and the locking groove; and An elastic member, one end of the elastic member is connected to the connection portion between the first support member and the manhole cover, the other end of the elastic member is connected to the guiding member. When the manhole cover is opened relative to the wellbore, under the action of the elastic member, the positioning member is locked in the locking groove, and the support member supports the manhole cover.

2. The manhole cover locking mechanism according to claim 1, characterized in that, The guiding groove guides the positioning member in the extending direction of the guiding portion; the locking groove is in the extending direction of the locking portion.

3. The manhole cover locking mechanism according to claim 2, characterized in that, The guiding direction of the guiding groove and the guiding direction of the locking groove form a 90° angle; and / or The connection portion between the guiding groove and the locking groove is arc-shaped.

4. The manhole cover locking mechanism according to claim 1, characterized in that, The positioning member is located at a position on the second support member relatively close to the first support member.

5. The manhole cover locking mechanism according to claim 4, characterized in that The positioning member is located on the second support member, and the length range from the connection portion with the first support member is 20mm - 25mm; and / or The positioning member is located on the second support member on the side relatively close to the outer sidewall of the wellbore.

6. The manhole cover locking mechanism according to claim 1, characterized in that, The length of the first support member is less than the length of the second support member.

7. The manhole cover locking mechanism according to claim 6, wherein, The length range of the first support member is 40mm - 50mm; and / or The length range of the second support member is 300mm - 350mm.

8. The manhole cover locking mechanism according to claim 1, characterized in that, One end of the guiding member connected to the first support member is located in the middle region of the first support member; and / or When the manhole cover is opened relative to the wellbore, the included angle range between the first support member and the second support member for support is 140° - 165°; and / or One end of the elastic member connected to the guiding member is located in the middle region of the guiding member; and / or The elastic member is a spring.

9. A manhole cover assembly, characterized in that, Includes: An apron manhole cover, including a wellbore and a manhole cover provided above the wellbore, the manhole cover is movably connected to the wellbore; And The manhole cover locking mechanism according to any one of claims 1 to 8, the manhole cover locking mechanism is provided on the apron manhole cover.

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