Manhole cover assembly

Abstract

The present application provides a manhole cover assembly, comprising an apron manhole cover, a power-assisting mechanism and a support arm assembly. The apron manhole cover comprises a manhole cover and a shaft provided below the manhole cover. The power-assisting mechanism is detachably assembled in the shaft and is located below the first manhole cover. The support arm assembly comprises a first support arm and a plurality of second support arms, one end of the first support arm extends into the shaft and is connected to the power-assisting mechanism, and the other end of the first support arm is connected to the second manhole cover. One end of the second support arm extends into the shaft and is movably connected to the shaft, and the other end of the second support arm is connected to the first manhole cover. The plurality of second support arms are located outside the first support arm. Under the action of the power-assisting mechanism, the first support arm assists the plurality of second support arms to open or close the second manhole cover. The power-assisting mechanism is detachably assembled in the shaft. When the power-assisting effect of the power-assisting mechanism deteriorates, it can be disassembled and replaced with a new power-assisting mechanism, which facilitates maintenance or disassembly or replacement, and reduces the difficulty and cost of maintenance or disassembly or replacement.

Description

Technical Field

[0001] The present application relates to the field of manhole covers, and in particular to a manhole cover assembly. Background Art

[0002] Manhole covers are installed above the fire protection, water supply and drainage, cable, valve and other manholes in the apron. Operators need to open the apron manhole covers for maintenance. Manhole covers are heavy in weight, and the manhole covers in related technologies usually do not have auxiliary lifting devices, requiring multiple people to work together to open and close the manhole covers. Due to the open environment around the airport, the wind speed is high and lasts for a long time. In addition, it is affected by the airflow of aircraft, so the apron manhole covers need to be installed firmly. The power assist mechanism of the manhole cover assembly in related technologies requires workers to enter the shaft and disassemble it from under the manhole cover, which increases the difficulty and cost of maintenance, disassembly or replacement. Summary of the Invention

[0003] The present application provides a manhole cover assembly with an assist mechanism that is convenient for maintenance, disassembly, or replacement.

[0004] The present application provides a manhole cover assembly, comprising:

[0005] An apron manhole cover comprises a manhole cover and a shaft provided below the manhole cover; the manhole cover comprises a first manhole cover and a second manhole cover, wherein the cross-sectional area of the first manhole cover is smaller than the cross-sectional area of the second manhole cover;

[0006] A power-assisting mechanism is detachably assembled in the wellbore and is located below the first well cover; wherein the second well cover is removed from the wellbore, the power-assisting mechanism is assembled in the wellbore from top to bottom, and the first well cover is assembled above the power-assisting mechanism; and

[0007] The support arm assembly includes a first support arm and multiple second support arms, one end of the first support arm extends into the wellbore and is connected to the power-assisting mechanism, and the other end of the first support arm is connected to the second manhole cover; one end of the second support arm extends into the wellbore and is movably connected to the wellbore, and the other end of the second support arm is connected to the first manhole cover; the multiple second support arms are located on the outside of the first support arm; the first support arm assists the multiple second support arms under the action of the power-assisting mechanism to open or close the second manhole cover.

[0008] Optionally, the power assist mechanism includes a fixed assembly and a torsion spring assembly, the fixed assembly includes a fixed frame and a fixed main shaft and a rotating shaft that are detachably assembled to the fixed frame, the fixed main shaft and the rotating shaft are located below the first manhole cover, the torsion spring assembly is sleeved on the fixed main shaft and is detachably assembled to the fixed frame as a whole; one end of the first support arm is connected to the rotating shaft, and when the second manhole cover is opened relative to the wellbore, the second manhole cover drives the first support arm and the rotating shaft to rotate synchronously.

[0009] Optionally, the torsion spring assembly includes a torsion spring body and a first adjustment end and a second adjustment end connected to both ends of the torsion spring body; the power assist mechanism also includes an adjustment assembly, which is assembled at the bottom of the fixed frame and is located in the wellbore; the adjustment assembly includes a limit member and an adjustment member connected to the limit member, the first adjustment end extends downward into the wellbore and abuts against the rotating shaft, the second adjustment end extends downward into the wellbore and cooperates with the limit member, the adjustment member drives the limit member to move the limit member, and drives the second adjustment end to rotate around the fixed main axis and in a direction close to the torsion spring body to tighten the preload force of the torsion spring assembly.

[0010] Optionally, the fixed frame includes a pre-tightening member, which is arranged on the inner side of the fixed frame and is arranged closer to the fixed main shaft relative to the rotating shaft in the radial direction of the fixed main shaft; the first adjustment end extends downward into the wellbore, and the first adjustment end is located at the bottom of the pre-tightening member and abuts against the pre-tightening member, so that the first adjustment end is located below the rotating shaft and abuts against the rotating shaft at the same time.

[0011] Optionally, the rotating shaft is connected to the shaft hole of the first support arm and includes a plurality of rotating members and sleeves, and the plurality of rotating members are connected to each other through the sleeves.

[0012] Optionally, the number of torsion spring assemblies is set to be multiple; the fixed assembly also includes a fixed plate, which is assembled on the fixed frame and is located between two adjacent torsion spring assemblies; the fixed plate is provided with a limiting groove upward, the torsion spring assembly is assembled on the fixed main shaft, and is detachably assembled as a whole in the limiting groove.

[0013] Optionally, the adjustment assembly is fixed to a side of the fixing plate facing the wellbore.

[0014] Optionally, the adjusting member is arranged closer to the second manhole cover relative to the limiting member in the radial direction of the fixed main shaft.

[0015] Optionally, the fixing assembly also includes a partition, which is assembled in the limiting groove of the fixing plate. The partition limits the fixed main shaft in the limiting groove to separate the torsion spring assembly; a notch is provided on the edge of the partition, and the partition is inserted into the limiting groove. A positioning groove is formed between the edge of the partition and the side wall of the limiting groove. Positioning grooves are provided on both sides of the fixed frame. A limiting block is protruding from the side of the first manhole cover facing the wellbore. When the first manhole cover is set in the wellbore, the limiting block cooperates with the positioning groove to limit the upper and lower directions to limit the power assist mechanism in the wellbore.

[0016] Optionally, the fixed spindle includes a spindle fixing portion and a spindle connecting portion arranged at both ends of the spindle fixing portion, the spring assembly is sleeved on the spindle fixing portion, and the cross-sectional area of the spindle connecting portion is smaller than the cross-sectional area of the spindle fixing portion; a first slide groove extending from top to bottom and a second slide groove extending from the fixed spindle to the rotating axis in the radial direction of the fixed spindle are provided on both sides of the fixed frame, the second slide groove is connected to the first slide groove, and when the torsion spring assembly is assembled to the spindle fixing portion, it is installed on the fixed frame from top to bottom from the first slide groove as a whole, and slides in the second slide groove extending from the fixed spindle to the rotating axis in the radial direction of the fixed spindle, so that the spindle connecting portion is clamped in the second slide groove.

[0017] Optionally, the manhole cover assembly also includes a manhole cover locking mechanism, which includes a support member, a guide member and an elastic member; one end of the support member extends into the wellbore and is movably connected to the wellbore, the guide member is provided on the support member, and the elastic member is connected to the second manhole cover and the guide member. When the second manhole cover is opened relative to the wellbore, under the action of the elastic member, the guide member guides the support member to support the second manhole cover.

[0018] Optionally, the wellbore includes a first side wall and a second side wall that are opposite to each other, and a third side wall and a fourth side wall that are opposite to each other.

[0019] Optionally, the first manhole cover and the second manhole cover are arranged in a direction extending from the third side wall toward the fourth side wall.

[0020] Optionally, the manhole cover assembly further includes an anti-falling net, which is arranged in the manhole, one side of the anti-falling net is movably connected to the first side wall, and the other end of the anti-falling net is overlapped on the second side wall.

[0021] Optionally, the manhole cover assembly further includes a ladder, which is assembled on the fourth side wall.

[0022] Optionally, the manhole cover assembly further includes a handhold, which is a U-shaped structure that can be received in the manhole.

[0023] Optionally, multiple warning rods can be stored in the wellbore, and include a first warning rod and a second warning rod connected to each other; when the second wellbore cover is opened, the first warning rod extends upward from the fourth side wall to the top of the wellbore, and the second warning rod extends from the top of the first warning rod along the third side wall toward the fourth side wall, and overlaps the lower surface of the second wellbore cover; when the second wellbore cover is closed on the wellbore, the first warning rod and the second warning rod are folded and are respectively stored in the first side wall and the second side wall.

[0024] Optionally, the manhole cover assembly also includes a lock hook failure opening device, including a clip and an auxiliary disassembly assembly, the clip is detachably connected to the lower surface of the second manhole cover; one end of the auxiliary disassembly assembly is connected to the clip, and the other end of the auxiliary disassembly assembly passes through the second manhole cover and is exposed on the upper surface of the second manhole cover, and is detachably assembled with the upper surface of the second manhole cover. When the auxiliary disassembly assembly is disassembled from the second surface, it drives the clip and the apron manhole to be disassembled to open the second manhole cover.

[0025] The apron manhole cover provided in the embodiment of the present application includes an apron manhole cover, a power-assisting mechanism and a support arm assembly. The apron manhole cover includes a manhole cover and a shaft below the manhole cover, and the manhole cover includes a first manhole cover and a second manhole cover. The power-assisting mechanism is detachably assembled in the shaft below the first manhole cover, and the second manhole cover is removed from the shaft, the power-assisting mechanism is assembled in the shaft from top to bottom, and the first manhole cover is assembled above the power-assisting mechanism. The support arm assembly includes a first support arm and a plurality of second support arms, one end of the first support arm is connected to the power-assisting mechanism, and the other end is connected to the second manhole cover. One end of the plurality of second support arms is movably connected to the shaft, and the other end is connected to the first manhole cover. In this arrangement, by setting the first support arm to be connected to the power-assisting mechanism, the first support arm assists the plurality of second support arms under the action of the power-assisting mechanism to provide support force for the opening and closing of the second manhole cover, and can slowly close when closing the second manhole cover, and can provide a buffer for the concrete around the manhole cover. The power-assisting mechanism is assembled in the wellbore in a detachable manner from top to bottom. When the power-assisting effect of the power-assisting mechanism deteriorates, it can be disassembled and replaced with a new one. At this time, there is no need for staff to enter the wellbore, and the replacement or maintenance can be completed outside the wellbore, which facilitates maintenance, disassembly or replacement and reduces the difficulty and cost of maintenance, disassembly or replacement.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

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

[0029] Figure 2 yes Figure 1 A schematic structural diagram of a manhole cover assembly from one perspective is shown;

[0030] Figure 3 yes Figure 1 A structural schematic diagram of an embodiment of a power assist mechanism of a manhole cover assembly is shown;

[0031] Figure 4 yes Figure 3 A schematic structural diagram of the power assist mechanism of the manhole cover assembly from one perspective is shown;

[0032] Figure 5 yes Figure 3 A schematic structural diagram of the power assist mechanism of the manhole cover assembly shown in FIG.

[0033] Figure 6 yes Figure 3 A structural schematic diagram of the power assist mechanism of the manhole cover assembly shown in FIG.

[0034] Figure 7 yes Figure 3 A structural schematic diagram of an embodiment of a limiting member of a power assist mechanism of a manhole cover assembly is shown;

[0035] Figure 8 yes Figure 1 A schematic structural diagram of the manhole cover assembly shown in FIG. 1 when the second manhole cover is in an open state;

[0036] Figure 9 yes Figure 1 A schematic structural diagram of the manhole cover assembly from another perspective when the second manhole cover is in an open state;

[0037] Figure 10 yes Figure 1 A structural schematic diagram of the manhole cover assembly shown in FIG. 1 with the second manhole cover in an open state from another perspective;

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

[0039] Figure 12 yes Figure 1 A structural schematic diagram of an embodiment of a manhole cover locking mechanism of a manhole cover assembly shown;

[0040] Figure 13 yes Figure 1 A structural schematic diagram of an embodiment of a guide member of a manhole cover locking mechanism of a manhole cover assembly shown;

[0041] Figure 14 yes Figure 1 A schematic structural diagram of the manhole cover assembly from another perspective is shown;

[0042] Figure 15 yes Figure 1 The structure diagram of an embodiment of a lock hook failure opening device for an apron manhole cover of a manhole cover assembly shown in FIG.

[0043] Reference numerals:

[0044] 1. Manhole cover; 2. Power assist mechanism; 3. Manhole cover locking mechanism; 4. Anti-fall net; 5. Ladder; 6. Handrail; 7. Warning pole; 8. Lock hook failure release device; 9. Manhole cover assembly; 10. Manhole cover; 11. Shaft; 12. Support arm assembly; 13. Fixing assembly; 20. Torsion spring assembly; 21. Adjustment assembly; 22. Fixing frame; 23. Fixing spindle; 24. Rotating axis; 25. Fixing plate; 26. Partition; 27. Spring Spring damping; 30, support member; 31, guide member; 32, elastic member; 40, protrusion; 70, first warning rod; 71, second warning rod; 80, clamping member; 81, auxiliary disassembly assembly; 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; 20 1. First adjustment end; 202. Second adjustment end; 210. Stopper; 211. Adjustment member; 212. Guide post; 213. Screw; 214. Through hole; 215. Guide opening; 216. Sliding groove; 217. Bottom wall; 218. First inner side wall; 219. Second inner side wall; 220. Preload member; 221. First slide groove; 222. Second slide groove; 223. First frame; 224. Second frame; 225. First screw Pores; 230, spindle fixing part; 231, spindle connecting part; 240, rotating part; 241, sleeve; 242, limit screw; 250, limit groove; 260, positioning groove; 300, first support member; 301, second support member; 302, positioning member; 310, guide groove; 311, locking groove; 312, guide part; 313, locking part; 314, positioning block; 700, first support rod; 701, second support rod. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain 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, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar words used in this specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, the terms "a" or "an" and similar words do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "plurality" or "several" mean two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper" and similar words are for convenience only and are not intended to limit to a single position or spatial orientation. The terms "include" or "comprising" and similar words mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar words are not limited to physical or mechanical connections and can 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. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates 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] The present application provides a manhole cover assembly including an apron manhole cover, a power-assisting mechanism, and a support arm assembly. The apron manhole cover includes a manhole cover and a shaft provided below the manhole cover. The manhole cover includes a first manhole cover and a second manhole cover, wherein the cross-sectional area of the first manhole cover is smaller than the cross-sectional area of the second manhole cover. The power-assisting mechanism is detachably assembled in the shaft and is located below the first manhole cover. The second manhole cover is removed from the shaft, the power-assisting mechanism is assembled in the shaft from top to bottom, and the first manhole cover is assembled above the power-assisting mechanism. The support arm assembly includes a first support arm and a plurality of second support arms, one end of the first support arm extends into the shaft and is connected to the power-assisting mechanism, and the other end of the first support arm is connected to the second manhole cover. One end of the second support arm extends into the shaft and is movably connected to the shaft, and the other end of the second support arm is connected to the first manhole cover. The plurality of second support arms are located outside the first support arm. Under the action of the power-assisting mechanism, the first support arm assists the plurality of second support arms to open or close the second manhole cover.

[0049] The manhole cover assembly of the embodiment of the present application is provided with a first support arm connected to a power-assisting mechanism. Under the action of the power-assisting mechanism, the first support arm assists multiple second support arms in providing support force for the opening and closing of the second manhole cover. When closing the second manhole cover, it can slowly close and provide a buffer for the concrete around the manhole cover. The power-assisting mechanism is detachably assembled from top to bottom in the wellbore. When the power-assisting effect of the power-assisting mechanism deteriorates, it can be removed and replaced with a new one. In this case, workers do not need to enter the wellbore. Replacement or maintenance can be completed outside the wellbore, which facilitates maintenance, disassembly or replacement and reduces the difficulty and cost of maintenance, disassembly or replacement.

[0050] The present application provides a manhole cover assembly. The manhole cover assembly of the present application is described in detail below in conjunction with the accompanying drawings. The features of the following embodiments and implementations may be combined with each other unless they conflict.

[0051] Figure 1 It is a structural schematic diagram of an embodiment of the manhole cover assembly 9 of the present application. Figure 2 for Figure 1 The structure diagram of the manhole cover assembly 9 from one perspective is shown. Figure 1 and Figure 2 As shown, the manhole cover assembly 9 includes an apron manhole cover 1, a power assist mechanism 2 and a manhole cover locking mechanism 3. The apron manhole cover 1 includes a manhole cover 10 and a shaft 11 provided below the manhole cover 10. The manhole cover 10 is movably connected to the shaft 11. The power assist mechanism 2 is detachably assembled in the shaft 11 and is connected to the manhole cover 10. The power assist 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. 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 being accidentally closed.

[0052] exist 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 the cross-sectional area of the second manhole cover 101. The second manhole cover 101 can be opened relative to the first manhole cover 100. The power-assisting mechanism 2 is detachably assembled in the wellbore 11 and is located below the first manhole cover 100. The second manhole cover 101 is disassembled from the wellbore 11, the power-assisting mechanism 2 is assembled from top to bottom in the wellbore 11, and the first manhole cover 100 is assembled above the power-assisting mechanism 2. With such an arrangement, the power-assisting mechanism 2 is detachably assembled from top to bottom in the wellbore 11. At this time, there is no need for staff to enter the wellbore 11, and replacement or maintenance can be completed outside the wellbore 11, which makes it convenient to disassemble, replace or maintain the power-assisting mechanism 2, reduces the difficulty and cost of maintenance, disassembly or replacement, and also improves the efficiency of disassembly or replacement. The power-assisting mechanism 2 is movably connected to the second manhole cover 101 to assist in the opening or closing of 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 being accidentally closed.

[0053] exist Figure 1 and Figure 2 In the illustrated embodiment, the manhole cover assembly 9 further includes a support arm assembly 12, which is used to connect the manhole 11, the second manhole cover 101, and the power-assisting mechanism 2. In some embodiments, the support arm assembly 12 includes a first support arm 121 and a plurality of second support arms 122, wherein the first support arm 121 and the second support arms 122 are strip-shaped structures. One end of the first support arm 121 extends into the manhole 11 and is connected to the power-assisting mechanism 2, while 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 manhole 11 and is movably connected to the manhole 11, while 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 arm 122 jointly support the second manhole cover 101. The plurality of second support arms 122 are located outside the first support arm 121, thereby providing a balanced support force to support the second manhole cover 101. On this basis, the first support arm 121 assists the multiple second support arms 122 under the action of the power-assist mechanism 2 to open or close the second manhole cover 101. By setting the first support arm 121 to be connected to the power-assist mechanism 2, the first support arm 121 assists the multiple second support arms 122 under the action of the power-assist mechanism 2 to provide support force for opening and closing the second manhole cover 101, and can slowly close when closing the second manhole cover 101, providing a cushion for the concrete around the manhole cover 101.

[0054] In this embodiment, there are two second support arms 122, one end 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 in the middle of the two second support arms 122, thereby providing a balanced support 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 power assist 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 the wellbore 11 to the upper part of the wellbore 11 as the second manhole cover 101 opens, and one end of the first support arm 121 is pushed by the power assist mechanism 2 to provide 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 the inside of the wellbore 11 as the second manhole cover 101 is closed. The first support arm 121 is supported by the power assist mechanism 2 to provide a buffer 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 to ensure 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 and has a more complex structure than the circular manhole cover in the related art. It is better in terms of operational safety, portability, maintainability, etc. However, the square structure has an increased weight while being complex in structure. Therefore, a power assist mechanism 2 is designed. The power assist mechanism 2 is respectively connected to the manhole cover 10 and the shaft 11 through a support arm assembly 12, providing support for the operator to open and close the second manhole cover 101, thereby improving work efficiency. When closing the second manhole cover 101, it can be closed slowly, which can provide a buffer for the concrete around the manhole cover 10.

[0056] Figure 3 for Figure 1 The structure diagram of an embodiment of the power assist mechanism 2 of the manhole cover assembly 9 is shown. Figure 4 yes Figure 3 The structure diagram of the power assist mechanism 2 of the manhole cover assembly 9 is shown from one perspective.

[0057] Figure 5 yes Figure 3 The schematic structural diagram of the power assist mechanism 2 of the manhole cover assembly 9 is shown from another perspective.

[0058] Figure 6 yes Figure 3 The schematic structural diagram of the assist mechanism 2 of the manhole cover assembly 9 is shown from another perspective.

[0059] Figure 7 yes Figure 3 The structure diagram of an embodiment of the limiting member of the assist mechanism 2 of the manhole cover assembly 9 is shown. Figures 1 to 7 As shown, the power assist mechanism 2 includes a fixing assembly 13, a torsion spring assembly 20, and an adjustment assembly 21. The fixing assembly 13 is used to fix the torsion spring assembly 20. The adjustment assembly 21 is used to adjust the preload force of the torsion spring assembly 20. Since the apron manhole cover 1 is heavy and bulky, the power assist mechanism 2 is provided to provide support for the operator to open and close the second manhole cover 101, thereby improving work efficiency. When closing the second manhole cover 101, it can be closed slowly, providing a buffer for the concrete around the manhole cover 10. In addition, by adjusting the preload force of the torsion spring assembly 20 through the adjustment assembly 21, the service life of the torsion spring assembly 20 can be extended, thereby saving costs.

[0060] exist Figures 2 to 6 In the illustrated embodiment, the fixing assembly 13 includes a fixing frame 22 and a fixing main shaft 23 and a rotating shaft 24 that are detachably assembled to the fixing frame 22. The fixing frame 22 is located below the first manhole cover 100. The torsion spring assembly 20 is sleeved on the fixing main shaft 23 and is detachably assembled to the fixing frame 22 as a whole. With this arrangement, the torsion spring assembly 20 is sleeved on the fixing main shaft 23 and detachably assembled to the fixing frame 22 as a whole, which facilitates the replacement or maintenance of the torsion spring assembly 20 and reduces the replacement or maintenance costs. 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 shaft 11, the second manhole cover 101 drives the first support arm 121 to rotate synchronously with the rotating shaft 24. With this arrangement, a supporting force can be provided when the second manhole cover 101 is opened. A buffering force can be provided when the second manhole cover 101 is closed.

[0061] exist Figures 3 to 6 In the illustrated embodiment, the fixed frame 22 includes two first frames 223 extending along a first direction X1 and two second frames 224 extending along a second direction X2. The first direction X1 and the second direction X2 intersect and are perpendicular to each other. The fixed 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 fixed 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 interconnected to form a frame structure that is connected from top to bottom. The fixed main shaft 23 can be assembled from the top of the fixed frame 22, and the rotating shaft 24 can be assembled from the bottom of the fixed frame 22.

[0062] exist 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 and the first adjustment end 201 and the second adjustment end 202 are an integral structure, wherein the first adjustment end 201 and the second adjustment end 202 extend from the top to the bottom from both ends of the torsion spring body 200. In some embodiments, the number of torsion spring assemblies 20 can be set to one or more. In this embodiment, the number of 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 are downward and extend in the direction of the rotation axis 24. The first adjustment ends 201 of the torsion spring assemblies 20 on both sides are set 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 torsion spring assembly 20 in the middle.

[0063] exist Figure 2 、 Figures 4 to 7 In the illustrated embodiment, the assist mechanism 2 further includes an adjustment assembly 21, which is assembled to the bottom of the fixed frame 22 and positioned within the shaft 11. The adjustment assembly 21 is disposed at the bottom of the torsion spring assembly 20 and the fixed spindle 23. The adjustment assembly 21 includes a stopper 210 and an adjustment member 211 connected to the stopper 210. The stopper 210 is configured to be positionally coupled to the torsion spring assembly 20. The adjustment member 211 is configured to adjust the preload of the torsion spring assembly 20. In this embodiment, the first adjustment end 201 extends downward into the shaft 11 and abuts the rotating shaft 24. The second adjustment end 202 extends downward into the shaft 11 and engages with the stopper 210. The adjustment member 211 drives the stopper 210, causing it to move, thereby causing the second adjustment end 202 to rotate about the fixed spindle 23 and toward the torsion spring body 200, thereby tightening the preload of the torsion spring assembly 20. By adjusting the adjusting member 211, the limiting member 210 is driven to move, causing the limiting member 210 to rotate, which in turn causes the second adjusting end 202 to rotate about the fixed main shaft 23 and toward the torsion spring body 200, thereby tightening the preload of the torsion spring assembly 20. This tightens the torsion spring force of the torsion spring assembly 20 and extends the service life of the torsion spring assembly 20. Furthermore, this provides support for workers opening and closing the second manhole cover 101, improving work efficiency. Furthermore, the second manhole cover 101 can be closed slowly, providing a cushion for the concrete surrounding the manhole cover 10.

[0064] exist Figures 4 to 6In the illustrated embodiment, one end of the retaining member 210 abuts against the first frame 223. A first threaded hole 225 is provided through the first frame 223 near the second adjustment end 202, and the retaining member 210 is provided with a second threaded hole (not shown) along the second direction X2. The adjustment member 211 includes a screw 213. One end of the screw 213 passes through the first threaded hole 225 and connects to the second threaded hole, threadedly connected to the retaining member 210. The other end of the screw 213 is free for adjustment. In this embodiment, the adjustment screw 213 rotates about the axial direction of the screw 213, driving the retaining member 210 to move along the axial direction of the screw 213, thereby driving the second adjustment end 202 to rotate about the fixed spindle 23 and toward the torsion spring body 200, thereby tightening the preload of the torsion spring assembly 20. In this embodiment, the axial direction of the screw 213 extends along the second direction X2. With this arrangement, by adjusting the screw 213, the rotational motion of the screw 213 about its axis is converted into linear motion of the stopper 210 along the axis of the screw 213, thereby driving the second adjustment end 202 to rotate toward the torsion spring body 200 to tighten the torsion spring force. The small number of components and simple adjustment method make the entire structure compact and small in size.

[0065] exist Figures 4 to 7 In the illustrated embodiment, the limiting member 210 includes a through hole 214, and 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 axial hole of the limiting member 210, which facilitates disassembly or assembly on the one hand and adjustment on the other hand. The limiting member 210 is provided with a through guide opening 215. The adjustment assembly 21 includes a guide column 212, which is inserted into the guide opening 215 and connected to the bottom of the fixed frame 22. The guide opening 215 is set away from the bottom of the fixed frame 22 to fix the adjusting member 211 to the fixed frame 22. The guide column 212 is used to limit the position of the screw 213. When the torsion spring assembly 20 becomes fatigued, the screw 213 is adjusted with a hexagonal wrench, driving the limiter 210 to move along the axial direction X1 of the screw 213 away from the second manhole cover 101, thereby driving the second adjustment end 202 to rotate about the fixed main axis 23 and toward the torsion spring body 200 until the purpose of adjusting the auxiliary force is achieved. This prevents the auxiliary force effect from being degraded due to fatigue caused by the long-term stress on 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 preload of the torsion spring assembly 20.

[0066] exist Figure 2 and Figure 4In the embodiment, the fixed frame 22 includes a pre-tightening member 220, which is arranged on the inner side of the fixed frame 22 and is arranged closer to the fixed main shaft 23 relative to the rotating shaft 24 in the radial direction of the fixed main shaft 23. The extension direction of the pre-tightening member 220 is the same as that of the first frame 223. The first adjustment end 201 extends downward into the wellbore 11, and the first adjustment 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 adjustment end 201 is located below the rotating shaft 24 and abuts against the rotating shaft 24 at the same time. In this arrangement, the pre-tightening member 220 can pre-limit the first adjustment end 201. Figure 2 In the illustrated embodiment, the rotating shaft 24 includes a plurality of rotating members 240 and a sleeve 241. The plurality of rotating members 240 are interconnected via the sleeve 241 and connected to the shaft hole of the first support arm 121. The sleeve 241 and the plurality of rotating members 240 are connected via a limit screw 242. This arrangement facilitates disassembly. The torsion spring body 200 provides support by abutting the rotating shaft 24 via the first adjustment end 201. When disassembling the torsion spring assembly 20 of the power assist mechanism 2, it is necessary to remove the preload member 220 and the sleeve 241 of the rotating shaft 24 and the plurality of rotating members 240 to relieve the force from the first adjustment end 201. When installing the torsion spring assembly 20 of the power assist mechanism 2, it is necessary to install the preload member 220 and abut against the first adjustment end 201 before installing the rotating shaft 24. This can enhance the reliability and tightness of the connection and prevent the first adjustment end 201 from directly abutting against the rotating shaft 24 and causing relative sliding.

[0067] In some embodiments, the number of torsion spring assemblies 20 is multiple. Figure 3 and Figure 6 As shown, the fixing assembly 13 also includes a fixing plate 25, which is assembled on the fixing frame 22 and is located between two adjacent torsion spring assemblies 20. The fixing plate 25 is a plate-shaped 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, and the torsion spring assembly 20 is assembled on the fixed main shaft 23 and is detachably assembled in the limiting groove 250 as a whole. In this embodiment, the fixing plate 25 is inserted between the two first frames 223 of the fixing frame 22, and is used to fix the plurality of torsion spring assemblies 20 and the fixed main shaft 23 to the fixing 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 adjustment assembly 21 is fixed to the side of the fixed plate 25 facing the wellbore 11, and the adjustment member 211 is arranged closer to the second manhole cover 101 in the radial direction of the fixed main shaft 23 relative to the limiting member 210. This arrangement makes it easier for operators to adjust, replace or maintain in the wellbore 11.

[0068] exist Figures 3 to 6In the illustrated embodiment, the fixing assembly 13 further includes a partition 26, which is assembled into a retaining groove 250 of the fixing plate 25. The partition 26 retains the fixing spindle 23 within the retaining groove 250, thereby separating the torsion spring assembly 20. The partition 26 serves to secure the torsion spring assembly 20. The partition 26 is removably assembled into the retaining groove 250, facilitating removal or replacement of the torsion spring assembly 20.

[0069] exist Figures 3 to 6 In the illustrated embodiment, a notch is provided at the edge of the partition 26, and the partition 26 is inserted into the limiting groove 250. A positioning groove 260 is formed between the edge of the partition 26 and the side wall of the limiting groove 250. Positioning grooves 260 are provided on both sides of the fixed frame 22. A limiting block is provided on the side of the first manhole cover 100 facing the shaft 11 (located on the lower surface of the first manhole cover 100, not shown). When the first manhole cover 100 is covered on the shaft 11, the limiting block cooperates with the positioning groove 260 in the upper and lower directions to limit the power assist mechanism 2 within the shaft 11. The limiting block provided on the lower surface of the first manhole cover 100, the limiting groove 250 and the positioning groove 260 limit the detachable partition 26 in the upper and lower directions, and at the same time prevents the fixed spindle 23 from moving in the upper and lower directions on the fixed frame 22. On the one hand, it is convenient to disassemble, and on the other hand, the fixation is simple, stable and reliable. In this embodiment, the sidewalls of the partition plate 26 are provided with a retaining groove (not shown) extending downward from top to bottom, and the sidewalls of the retaining groove 250 are provided with a retaining protrusion (not shown) extending downward from top to bottom and matching the retaining groove 250. The partition plate 26 is assembled with the retaining groove 250 of the fixing plate 25 through the retaining cooperation between the retaining protrusion and the retaining groove. This arrangement provides a simple structure and a better fixing effect.

[0070] exist Figures 4 to 7 In the illustrated embodiment, the stopper 210 in the adjustment assembly 21 is fixed to the side of the fixed plate 25 facing the shaft 11. A sliding groove 216 is defined on the side of the stopper 210 facing the fixed plate 25. The sliding groove 216 extends along the second direction X2 and is engaged with the fixed plate 25. The sliding groove 216 includes a bottom wall 217 and a first inner sidewall 218 and a second inner sidewall 219 disposed therein. The two sidewalls of the fixed plate 25 are sandwiched between the first inner sidewall 218 and the second inner sidewall 219, and the bottom of the fixed plate 25 is in contact with the bottom wall 217. This arrangement allows the stopper 210 to be slidably assembled with the fixed plate 25 via the sliding groove 216. When an operator adjusts the screw 213, the stopper 210 moves along the sliding groove 216 away from the second manhole cover 101, thereby driving the second adjustment end 202 to rotate about the fixed spindle 23 and toward the torsion spring body 200 until the adjustment assist is achieved. This simple and reliable method provides a reliable and convenient solution.

[0071] exist Figure 2In the embodiment shown, the fixed main shaft 23 deviates from the central area of the second frame 224 and is arranged on one side close to the limit member 210 in the second direction X2. The length of the first adjustment end 201 is greater than the length of the second adjustment end 202. The rotating shaft 24 abuts against the end of the first adjustment end 201 away from the limit member 210, and the opening and closing of the second manhole cover 101 drives the first adjustment end 201 to rotate at a larger angle. Such an arrangement can provide greater assistance for opening the second manhole cover 101. Figure 6 In the illustrated embodiment, the fixed spindle 23 includes a spindle fixing portion 230 and spindle connecting portions 231 disposed at both ends of the spindle fixing portion 230. The spring assembly is sleeved on the spindle fixing portion 230, and the cross-sectional area of the spindle connecting portion 231 is smaller than that of the spindle fixing portion 230. The spindle fixing portion 230 is primarily used to mount the torsion spring assembly 20, and the spindle fixing portion 230 is primarily used to be mounted on the second frame 224 of the fixed frame 22. The fixed frame 22 is provided with a first chute 221 extending downward from the top and a second chute 222 extending radially from the fixed spindle 23 toward the rotating shaft 24 on both sides. The second chute 222 is connected to the first chute 221. When the torsion spring assembly 20 is assembled on the spindle fixing portion 230, it is installed on the fixed frame 22 from the top to the bottom as a whole, along the first chute 221. It slides in the second chute 222 extending radially from the fixed spindle 23 toward the rotating shaft 24, so that the spindle connecting portion 231 is engaged with the second chute 222. When replacing the torsion spring assembly 20, the partition 26 above the spindle connecting portion 231 is first removed. The fixed spindle 23 and the torsion spring assembly 20 are then rotated and pushed out along the second chute 222 and removed from the bottom to the top along the first chute 221. After the new torsion spring assembly 20 is mounted on the fixed main shaft 23, the fixed main shaft 23 and the torsion spring assembly 20 are placed as a whole into the first slide groove 221 from top to bottom, and then pushed along the second slide groove 222 to the 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 the partition 26 is placed to limit the main shaft connection part 231. The cross-sectional area of the main shaft fixing part 230 is adapted to the size of the first slide groove 221 and the second slide groove 222, and the cross-sectional area of the main shaft connection part 231 is set to be smaller than the cross-sectional area of the main shaft fixing part 230, so that the size of the first slide groove 221 and the second slide groove 222 can be made smaller, and the stability can be improved while ensuring that it can be installed. Figures 4 to 6 In the embodiment shown, the assist mechanism 2 further includes spring dampers 27, which are respectively arranged on the outside of both sides of the fixed frame 22. Figure 6 In the illustrated embodiment, the spring dampers 27 are respectively provided on the outer sides of the second frame 224 . The spring dampers 27 are devices for absorbing inertia after the second manhole cover 101 is opened.

[0072] Combine Figures 1 to 7In the illustrated embodiment, when replacing the torsion spring assembly 20 of the assist mechanism 2, first, the second manhole cover 101 is opened using a lifting device or manually. The operator then descends the well and uses a hexagonal wrench to remove the stop screw 242 on the sleeve 241. The sleeve 241 and the plurality of rotating members 240 are then removed. The preload member 220 is then removed using a lever sleeve. The second manhole cover 101 is now free of force. The adjustable screw 213 is then adjusted using an adjustable wrench to loosen the torsion spring assembly 20. The adjustment assembly 21 is then removed as a whole along the sliding groove 216. The second manhole cover 101 is then repositioned using a lifting device or manually. After removing the plurality of screws securing the first manhole cover 100 using a socket wrench, the first manhole cover 100 is removed. The partition 26 above the main shaft connection portion 231 is then removed. The fixed main shaft 23 and the torsion spring assembly 20 are then rotated and pushed out along the second slide groove 222 and removed from the bottom up along the first slide groove 221. After the new torsion spring assembly 20 is mounted on the fixed main shaft 23, the fixed main shaft 23 and the torsion spring assembly 20 are placed as a whole from top to bottom into the first slide groove 221, and then pushed along the second slide groove 222 to the 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 the partition 26 is placed to limit the main shaft connection part 231. Reset the first manhole cover 100 and fix the first manhole cover 100 with screws. Use lifting equipment or manual labor to open the second manhole cover 101, pass the second adjustment end 202 through the through hole 214 of the limiting member 210, and clip the adjustment assembly 21 as a whole to the fixed plate 25 along the sliding groove 216. Use a lever sleeve to install the preload member 220 to the inner side of the fixed frame 22 to limit the first adjustment 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 about the axis of the screw rod 213 to drive the limiter 210 connected to the screw rod 213, causing the limiter 210 to move away from the second manhole cover 101. The movement of the limiter 210 drives the second adjustment end 202 to rotate about the fixed main shaft 23 and toward the torsion spring body 200 to tighten the preload of the torsion spring assembly 20, completing the replacement of the torsion spring assembly 20 of the power assist mechanism 2. This arrangement avoids the deterioration of the power assist effect caused by fatigue of the torsion spring assembly 20 due to long-term stress. 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 preload of the torsion spring assembly 20.

[0073] Figure 8 yes Figure 1 The structure diagram of the second manhole cover 101 of the manhole cover assembly 9 shown in FIG. 9 is in an open state from one perspective. Figure 9 yes Figure 1 The structure diagram of the second manhole cover 101 of the manhole cover assembly 9 shown in another perspective is when it is in an open state. Figure 10 yes Figure 1The structure diagram of the second manhole cover 101 of the manhole cover assembly 9 shown in the open state is shown from another perspective. Figure 11 yes Figure 1 The diagram shows a structural diagram of the connection between the second manhole cover and the manhole cover locking mechanism of the manhole cover assembly. Figure 12 yes Figure 1 The structure diagram of an embodiment of the manhole cover locking mechanism 3 of the manhole cover assembly 9 is shown. Figure 13 yes Figure 1 The structure diagram of an embodiment of the guide member 31 of the manhole cover locking mechanism 3 of the manhole cover assembly 9 is shown. Figures 1 to 2 、 Figures 8 to 13 As shown, the manhole cover locking mechanism 3 is used to support the second manhole cover 101 on the one hand and lock the second manhole cover 101 on the other hand when the second manhole cover 101 is opened. 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 plays the role of supporting the second manhole cover 101. The elastic member 32 is used to provide elastic force, and the guide member 31 guides the support member 30 to extend and retract under the action of the elastic member 32. 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, collision, etc., to prevent accidents such as accidental closure that could trap workers underground or cause them to be pinched by the manhole cover 10. The manhole cover locking mechanism 3 is closer to the edge of the shaft 11 than the second support arm 122, making it easier for workers to operate from outside the shaft 11 and preventing them from being trapped underground or pinched by the manhole cover 10 after unlocking the manhole cover locking mechanism 3, ensuring safety and reliability.

[0074] exist 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 easily retractable, and is compact. 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 shaft 11. This movable connection can be a connecting shaft movable connection, 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 via the positioning member 302. The guide member 31 is provided with a guide groove 310 and a locking groove 311 connected to 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 shaft 11, the positioning member 302 is locked in the locking groove 311 under the action of the elastic member 32, and the support member 30 supports the second manhole cover 101. Figures 8 to 10 When the second manhole cover 101 is in the fully opened position, 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, and the positioning member 302 is locked. At this time, the second manhole cover 101 cannot be closed normally under external force conditions, and 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 closed normally. 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 touch by personnel, collision, etc., to avoid accidental closure causing safety accidents such as staff being trapped underground or being pinched by the manhole cover 10. In the above locking process, there is surface contact between 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. The advantages of surface contact are low pressure, high bearing capacity and impact resistance.

[0075] exist Figures 12 to 13In the illustrated embodiment, the guide member 31 includes a guide portion 312 and a locking portion 313 intersecting the guide portion 312. The guide portion 312 provides guidance, while the locking portion 313 provides locking. The locking portion 313 is located at one end of the guide portion 312 proximal to the second support member 301 and extends from the guide portion 312 along the shaft 11 toward the second manhole cover 101. This arrangement positions the locking portion 313 away from the second manhole cover 101, allowing the positioning member 302 to be restrained within the locking portion 313, providing a stable and reliable locking force to the second manhole cover 101. The guide portion 312 includes a guide groove 310, and the locking portion 313 includes a locking groove 311. The guide groove 310 guides the positioning member 302 in the direction in which the guide portion 312 extends. The locking groove 311 engages and locks the positioning member 302 in both the direction in which the locking portion 313 extends and the direction in which the guide portion 312 extends. With this arrangement, the locking portion 313 extends toward the second manhole cover 101 , so that when the second manhole cover 101 is locked, even if the exterior of the second manhole cover 101 is subjected to external force, the positioning member 302 will not slide back into the guide groove 310 , thereby improving safety.

[0076] exist Figures 12 to 13 In the embodiment shown, the guiding direction of the guide groove 310 and the guiding direction of the locking groove 311 are 90 degrees apart. This arrangement allows the positioning member 302 to be locked in the locking groove 311 and is not easily disengaged from the locking groove 311 under the action of external force, which is stable and reliable. Figures 12 to 13 In the embodiment shown, the connection between the guide groove 310 and the locking groove 311 is in an arc shape. In this way, the guide groove 310 and the locking groove 311 are connected in an arc shape, which is conducive to the positioning member 302 sliding into the locking groove 311 under the action of the elastic member 32. Figures 12 to 13 In the illustrated embodiment, the positioning member 302 is located at a position where the second support member 301 is relatively close to the first support member 300. This arrangement prevents the guide member 31 from being too long, thereby preventing the positioning member 302 from being disengaged from the locking groove 311 under the action of external forces due to the angle between the first support member 300 and the second support member 301 being too small in the locked state, thereby affecting the locking stability.

[0077] exist Figures 12 to 13 In the embodiment shown, the positioning member 302 is located on the second support member 301, and the length range of the distance from the connection with the first support member 300 is 20mm-25mm. In some embodiments, the length of the connection between the positioning member 302 and the first support member 300 and the second support member 301 can be 20mm or 21mm or 22mm or 23mm or 24mm or 25mm. In this way, the position of the positioning member 302 is set appropriately, and it can switch freely between locking and unlocking while ensuring stable locking, and the length and volume of the manhole cover locking mechanism 3 are reduced. Figures 12 to 13In the illustrated embodiment, the positioning member 302 and the guide member 31 are located on a side of the second support member 301 that is relatively close to the outer wall of the shaft 11. This arrangement, in which the positioning member 302 is located near the outer side of the shaft 11, facilitates operation by personnel outside the shaft 11, facilitating movement of the positioning member 302 along the locking groove 311 to the guide groove 310, and also facilitates unlocking the positioning member 302 from the locking groove 311, further facilitating operation by personnel.

[0078] exist 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 in the shaft 11 and is farther away from the second manhole cover 101, the length of the second support member 301 is set to be greater than the length of the first support member 300 to facilitate storage in the shaft 11. 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, which is convenient for staff to operate. In addition, it is also possible to switch between locking and unlocking freely, with stable and reliable locking and easy and effortless unlocking. In some embodiments, the length of the first support member 300 ranges from 40 mm to 50 mm. In some embodiments, the length of the first support member 300 can be 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, or 50 mm. The length of the first support member 300 is set appropriately to ensure stable and reliable locking and easy and effortless unlocking, and it should not be too long or too short. In some embodiments, the length of the second support member 301 ranges from 300 mm to 350 mm, and the length of the second support member 301 can be 310 mm, 320 mm, 330 mm, 340 mm, or 350 mm. The length of the second support member 301 is set appropriately to ensure stable and reliable locking and easy and effortless unlocking, and it should not be too long or too short.

[0079] exist Figures 12 to 13 In the embodiment shown, the end of the guide member 31 connected to the first support member 300 is located in the middle area of the first support member 300. In this embodiment, combined with the length ratio of the first support member 300, the length of the end of the guide member 31 connected to the first support member 300 from the connection between the first support member 300 and the second support member 301 and the length range from the positioning member 302 to the connection between the first support member 300 and the second support member 301 are relatively close. This arrangement can make the locking stable and reliable, while unlocking is easy and effortless. In some embodiments, when the second manhole cover 101 is opened relative to the manhole 11, the angle supported by the first support member 300 and the second support member 301 ranges from 140° to 165°. Figures 10 to 12In the embodiment shown, when the second manhole cover 101 is opened relative to the shaft 11, the angle of support between the first support member 300 and the second support member 301 can be 140°, 145°, 150°, 155°, 160°, or 165°. This arrangement enables the first support member 300, the second support member 301, and the guide member 31 to form a stable triangular structure under the action of the elastic member 32, which has good locking stability and is easy to unlock, making it easier for operators to operate. Figures 11 to 12 In the embodiment shown, the elastic member 32 is a spring. The structure is simple and the elasticity is stable. One end of the elastic member 32 is connected to the middle area 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 area 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 area 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 area of the guide member 31 for fixing one end of the spring. In this way, the length and position of the spring are set appropriately. While satisfying the effect of the elastic force, the length of the spring can be minimized, which is convenient for storage and has a compact structure.

[0080] Figure 14 yes Figure 1 The structure diagram of the manhole cover assembly from another perspective is shown. Figures 1 to 2 and Figure 13 As shown, the wellbore 11 includes a first sidewall 110 and a second sidewall 111, and a third sidewall 112 and a fourth sidewall 113. The first manhole cover 100 and the second manhole cover 101 are arranged in a direction extending from the third sidewall 112 toward the fourth sidewall 113. The first and second sidewalls 110, 111 are arranged in a first direction X1. The third and fourth sidewalls 112, 113 are arranged in a second direction X2. The first manhole cover 100 covers the first, second, and third sidewalls 111, 112 of the wellbore 11. The second manhole cover 101 covers the first, second, and fourth sidewalls 111, 113 of the wellbore 11. The fourth sidewall 113 is located on the side convenient for personnel to operate. The first, second, third, and fourth sidewalls 110, 111, 112, and 113 are interconnected to form the wellbore 11, which has a depth dimension. Workers can enter the wellbore 11 to perform operations.

[0081] exist Figure 1 、 Figure 2 、 Figure 13In the embodiment shown, the manhole cover assembly also includes an anti-falling net 4, which is arranged in the shaft 11. One side of the anti-falling net 4 is movably connected to the first side wall 110, and the other end of the anti-falling net 4 is overlapped on the second side wall 111. In this embodiment, the anti-falling net 4 is in a grid shape. A protrusion 40 is provided above the anti-falling net of the first side wall 110 of the shaft 11, which is used to lift the end of the anti-falling net 4 overlapped on the second side wall 111 and vertically fix it on the protrusion 40 when the anti-falling net 4 is not needed. In this embodiment, the material used for the anti-falling net 4 is 6061-T4 aluminum alloy. The anti-falling net 4 made of this material is characterized by light weight and high strength.

[0082] exist Figure 1 、 Figure 2 、 Figure 14 In the embodiment shown, the manhole cover assembly further includes a ladder 5, which is assembled on the fourth side wall 113. In this embodiment, the ladder 5 is hinged to the fourth side wall 113 of the shaft 11 by bolts, making full use of the space in the shaft 11, with a compact layout and convenient for workers to go down the shaft for operation. Figure 14 In the embodiment shown, the manhole cover assembly also includes a plurality of handholds 6, which are U-shaped structures and can be stored in the wellbore 11. One end of the handhold 6 is a free end, and the other end of the handhold 6 extends into the wellbore 11 and is fixed to the fourth side wall 113. The section of the handhold 6 extending into the wellbore 11 is retractable. When the second manhole cover 101 is opened, the end of the handhold 6 extending into the wellbore 11 is extended, and the free end of the handhold 6 is overlapped on the outside of the wellbore 11. When the second manhole cover 101 is closed on the wellbore 11, the end of the handhold 6 extending into the wellbore 11 is retracted and the handhold 6 is stored in the fourth side wall 113. The handhold 6 is provided to assist the staff in going down the well. In this embodiment, the handhold 6 can be painted with fluorescent yellow paint to ensure the reflective effect during nighttime operations and further improve the safety of operations.

[0083] Look back Figure 1 ,exist Figure 1In the illustrated embodiment, the manhole cover assembly also includes multiple warning rods 7, comprising a first warning rod 70 and a second warning rod 71, which are interconnected. When the second manhole cover 101 is open, the first warning rod 70 extends upward from the fourth sidewall 113 to the top of the shaft 11. The second warning rod 71 extends from the top of the first warning rod 70 along the third sidewall 112 toward the fourth sidewall 113, overlapping the bottom surface of the second manhole cover 101. When the second manhole cover 101 is closed on the shaft 11, the first and second warning rods 70 and 71 fold and are respectively stored in the first and second sidewalls 110 and 111. The first and second warning rods 70 and 71 are foldable and can be stored within the first and second sidewalls 110 and 111 of the shaft 11, resulting in a compact layout. In this embodiment, the second warning rod 71 is a telescopic rod comprising a first support rod 700 and a second support rod 701. The first support rod 700 has a receiving cavity with an opening, allowing the second support rod 701 to be movably inserted into the cavity through the opening. When the first warning rod 70 and the second warning rod 71 are folded, the second support rod 701 is inserted into the receiving cavity of the first support rod 700, thereby saving space within the wellbore 11. The second warning rod 71 is provided with a warning decoration to serve as a warning to the outside world when workers are working in the well, thereby improving safety.

[0084] Figure 15 yes Figure 1 The structure diagram of an embodiment of the lock hook failure opening device 8 of the apron manhole cover 1 of the manhole cover assembly 9 shown in FIG. Figure 1 and Figure 15 In the illustrated embodiment, the lock 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 shaft 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 from the upper surface of the second manhole cover 101, it drives the clamping member 80 to be disassembled from the shaft 11 to open the second manhole cover 101. When the apron manhole cover 1 is difficult or impossible to open, the auxiliary disassembly assembly 81 can assist in opening the apron manhole cover 1. One end of the auxiliary disassembly component 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. Figure 15In the embodiment shown, one end of the auxiliary disassembly assembly 81 is located on the lower surface of the second manhole cover 101 and is connected to the clamping member 80. The other end of the auxiliary disassembly assembly 81 is exposed on the upper surface of the second manhole cover 101 and can be detachably assembled with the upper surface of the second manhole cover 101, making it easy for staff to operate to assist in opening the apron manhole cover 1. Figure 15 In the embodiment shown, when auxiliary disassembly is not required, the auxiliary disassembly component 81 is assembled on the upper surface of the second manhole cover 101. When disassembly is required, the auxiliary disassembly component 81 is separated from the upper surface of the second manhole cover 101. When the auxiliary disassembly component 81 and the upper surface of the second manhole cover 101 are disassembled and separated, the clamping member 80 and the apron well are disassembled to open the second manhole cover 101. In this way, the other end of the auxiliary disassembly component 81 is arranged on the upper surface of the second manhole cover 101, that is, on the side facing the outside world, which is convenient for operators to operate the auxiliary disassembly component 81. In this embodiment, the auxiliary disassembly component 81 can be assembled on the upper surface of the second manhole cover 101 or disassembled from the upper surface of the second manhole cover 101 with the help of an external disassembly tool, and the disassembly tool is not limited in this application.

[0085] By providing an auxiliary disassembly assembly 81, 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 second manhole cover 101 cannot be opened, the operator pulls the auxiliary disassembly assembly 81 to disassemble the auxiliary disassembly assembly 81 from the upper surface of the second manhole cover 101, driving the clamping member 80 to disassemble from the apron well, thereby opening the second manhole cover 101. This makes it easier for the operator to assist in opening the apron well cover 1, thereby solving the problem of the apron well cover being difficult to open or unable to open.

[0086] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the inventions claimed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not claimed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0087] It should be understood that the present application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope of the present application. The scope of the present application is limited only by the appended claims. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A manhole cover assembly, characterized in that: include: An apron manhole cover comprises a manhole cover and a shaft provided below the manhole cover; the manhole cover comprises a first manhole cover and a second manhole cover, wherein the cross-sectional area of the first manhole cover is smaller than the cross-sectional area of the second manhole cover; a power-assisting mechanism detachably assembled in the shaft and located below the first manhole cover; wherein the second manhole cover is removed from the shaft, the power-assisting mechanism is assembled in the shaft from top to bottom, and the first manhole cover is assembled above the power-assisting mechanism; The support arm assembly includes a first support arm and a plurality of second support arms, wherein one end of the first support arm extends into the wellbore and is connected to the power-assisting mechanism, and the other end of the first support arm is connected to the second manhole cover; one end of the second support arm extends into the wellbore and is movably connected to the wellbore, and the other end of the second support arm is connected to the first manhole cover; wherein the plurality of second support arms are located outside the first support arm; and the first support arm assists the plurality of second support arms under the action of the power-assisting mechanism to open or close the second manhole cover; The power-assisting mechanism includes a fixed assembly and a torsion spring assembly, the fixed assembly including a fixed frame and a fixed main shaft and a rotating shaft detachably assembled to the fixed frame, the fixed main shaft and the rotating shaft being located below the first manhole cover, the torsion spring assembly being sleeved on the fixed main shaft and detachably assembled to the fixed frame as a whole; one end of the first support arm is connected to the rotating shaft, and when the second manhole cover is opened relative to the shaft, the second manhole cover drives the first support arm to rotate synchronously with the rotating shaft; The torsion spring assembly includes a torsion spring body and a first adjusting end and a second adjusting end connected to both ends of the torsion spring body; the power assist mechanism also includes an adjusting assembly, which is assembled at the bottom of the fixed frame and is located in the wellbore; the adjusting assembly includes a limit member and an adjusting member connected to the limit member, the first adjusting end extending downward into the wellbore and abutting against the rotating shaft, the second adjusting end extending downward into the wellbore and engaging with the limit member, the adjusting member driving the limit member to move the limit member, thereby driving the second adjusting end to rotate around the fixed main shaft and in a direction close to the torsion spring body to tighten the preload force of the torsion spring assembly; The fixed frame includes a pre-tightening member, which is arranged on the inner side of the fixed frame and is arranged closer to the fixed main shaft than the rotating shaft in the radial direction of the fixed main shaft; the first adjusting end extends downward into the wellbore, the first adjusting end is located at the bottom of the pre-tightening member and abuts against the pre-tightening member, so that the first adjusting end is located below the rotating shaft and abuts against the rotating shaft at the same time; and / or The rotating shaft is connected to the shaft hole of the first supporting arm and includes a plurality of rotating members and sleeves, wherein the plurality of rotating members are connected to each other through the sleeves.

2. The manhole cover assembly according to claim 1, characterized in that: The number of the torsion spring assemblies is set to be multiple; the fixing assembly also includes a fixing plate, which is assembled on the fixing frame and is located between two adjacent torsion spring assemblies; the fixing plate is provided with a limiting groove upward, and the torsion spring assembly is assembled on the fixed main shaft and is detachably assembled as a whole in the limiting groove.

3. The manhole cover assembly according to claim 2, characterized in that: The adjusting assembly is fixed to a side of the fixing plate facing the wellbore; and / or The adjusting member is arranged closer to the second manhole cover in the radial direction of the fixed main shaft than the limiting member.

4. The manhole cover assembly according to claim 2, characterized in that: The fixing assembly further includes a partition plate, which is assembled at the limiting groove of the fixing plate, and the partition plate limits the fixing main shaft in the limiting groove to separate the torsion spring assembly; A notch is provided at the edge of the partition, and the partition is inserted into the limiting groove. A positioning groove is formed between the edge of the partition and the side wall of the limiting groove. The positioning grooves are provided on both sides of the fixed frame. A limiting block is protruding from the side of the first manhole cover facing the well shaft. When the first manhole cover is installed in the well shaft, the limiting block cooperates with the positioning groove in the upper and lower directions to limit the power assist mechanism within the well shaft.

5. The manhole cover assembly according to claim 2, characterized in that: The fixed spindle includes a spindle fixing portion and a spindle connecting portion provided at both ends of the spindle fixing portion, the torsion spring assembly is sleeved on the spindle fixing portion, and the cross-sectional area of the spindle connecting portion is smaller than the cross-sectional area of the spindle fixing portion; The fixed frame has a first sliding groove extending from top to bottom and a second sliding groove extending from the fixed main shaft to the rotating shaft in the radial direction of the fixed main shaft. The second sliding groove is connected to the first sliding groove. When the torsion spring assembly is assembled to the main shaft fixing part, it is installed on the fixed frame from top to bottom as a whole from the first sliding groove, and slides in the second sliding groove extending from the fixed main shaft to the rotating shaft in the radial direction of the fixed main shaft, so that the main shaft connecting part is engaged in the second sliding groove.

6. The manhole cover assembly according to claim 1, characterized in that: The manhole cover assembly also includes a manhole cover locking mechanism, which includes a support member, a guide member and an elastic member; one end of the support member extends into the wellbore and is movably connected to the wellbore, the guide member is provided on the support member, and the elastic member is connected to the second manhole cover and the guide member. When the second manhole cover is opened relative to the wellbore, under the action of the elastic member, the guide member guides the support member to support the second manhole cover.

7. The manhole cover assembly according to claim 1, characterized in that: The wellbore comprises a first side wall and a second side wall which are opposite to each other, and a third side wall and a fourth side wall which are opposite to each other; The first manhole cover and the second manhole cover are arranged in a direction in which the third side wall extends toward the fourth side wall; and / or The manhole cover assembly further includes an anti-falling net, which is arranged in the manhole, one side of the anti-falling net is movably connected to the first side wall, and the other end of the anti-falling net is overlapped on the second side wall; and / or The manhole cover assembly further includes a ladder, and the ladder is assembled on the fourth side wall; and / or The manhole cover assembly further includes a hand-holding member, which is a U-shaped structure and can be received in the manhole; and / or a plurality of warning rods receivable in the shaft, and comprising a first warning rod and a second warning rod connected to each other; when the second shaft cover is opened, the first warning rod extends upward from the fourth side wall to the top of the shaft, and the second warning rod extends from the top of the first warning rod along the third side wall toward the fourth side wall, and overlaps the lower surface of the second shaft cover; when the second shaft cover is closed on the shaft, the first warning rod and the second warning rod are folded and respectively receivable in the first side wall and the second side wall; and / or The manhole cover assembly also includes a lock hook failure opening device, including a clamping part and an auxiliary disassembly assembly, the clamping part is detachably connected to the lower surface of the second manhole cover; one end of the auxiliary disassembly assembly is connected to the clamping part, and the other end of the auxiliary disassembly assembly passes through the second manhole cover and is exposed on the upper surface of the second manhole cover, and is detachably assembled with the upper surface of the second manhole cover. When the auxiliary disassembly assembly is disassembled from the upper surface of the second manhole cover, it drives the clamping part and the apron manhole to be disassembled to open the second manhole cover.

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