An inner tightening manhole door device

Abstract

The utility model discloses an inner-tightening manhole door device, which belongs to the technical field of manhole doors. The device includes a manhole barrel section, a manhole door cover, a rotating assembly and a fixing assembly; a connecting plate is arranged on the inner wall of the head of the manhole barrel section, and the manhole door cover is rotatably connected to the connecting plate through a rotating assembly; the fixing assembly is arranged on the outer wall of the manhole door cover, and the manhole door cover is locked and fixed to the manhole barrel section through the fixing assembly. The utility model has a simple structure and is easy to operate. By arranging a rotating assembly and a fixing assembly, it effectively reduces the opening and closing operation errors of the manhole door caused by human factors, and improves the installation, opening and closing efficiency of the manhole door; at the same time, it reduces the number of fasteners, improves assembly efficiency, brings direct benefits to the work on the nuclear power maintenance site, and reduces labor and time costs.

Description

Technical Field

[0001] The utility model belongs to the technical field of manhole doors, and in particular relates to an inner-tightening manhole door device. Background Art

[0002] The existing inner-tightening manhole door adopts two half-elliptical covers and 12 manhole bolts to fasten the manhole door. The manhole door cover is composed of two half-elliptical covers. The manhole door and the adjustment ring form a concave and convex flange to match the sealing surface. The elliptical gasket is "suspended" on the convex surface of the manhole door. After the manhole door is closed, the manhole door and the manhole pipe seat compact the elliptical gasket. A connecting plate is welded on the manhole door. The connecting plate and the rotating shaft are assembled together through nuts and retaining rings. The other end of the rotating shaft is connected to the connecting plate welded on the head. The manhole door can rotate around the rotating shaft, and the rotating shaft can also rotate around the connecting plate welded on the head, so as to complete the opening or closing of the manhole door.

[0003] However, the above manhole door structure has the following disadvantages:

[0004] 1. The manhole door assembly is heavy as a whole, and it is very difficult to open and close the manhole door by manpower alone. There are no special tools or auxiliary means to help open and close, and the efficiency is low;

[0005] 2. Due to the heavy weight of the manhole door, the gap between the rotating shaft and the connecting plate is large, the rotating shaft is overloaded, resulting in large deformation, inaccurate assembly, and the rotating shaft structure is easy to get stuck, making it difficult to reinstall the manhole;

[0006] 3. The door cover is heavy and has many fasteners, which puts a heavy load on the operator, making installation time-consuming and labor-intensive, and difficult to load and unload;

[0007] 4. There is no corresponding detection structure on the manhole door to identify whether the manhole door is closed in place, and there is no defensive barrier to prevent installation failure.

[0008] Therefore, it is necessary to make further improvements to the existing manhole door structure. Utility Model Content

[0009] In view of this, the utility model provides an inner-tightening manhole door device, aiming to solve the problems of difficulty in opening and closing the manhole door, low efficiency and on-site replacement.

[0010] The utility model is realized by the following technical solutions:

[0011] An inner-tightening manhole door device comprises a manhole cylinder section, a manhole door cover, a rotating assembly and a fixing assembly, wherein a connecting plate is arranged on the inner wall of the head of the manhole cylinder section; the rotating assembly comprises a rotating shaft, a fixing pin, an ear plate and a fixing nut; the ear plate is fixed to the middle part of the inner wall of the manhole door cover, one end of the rotating shaft passes through the ear plate and is locked and fixed by a fixing nut; the other end of the rotating shaft passes through the connecting plate, the fixing pin is arranged on the end of the rotating shaft passing through the connecting plate, and the manhole door cover is rotatably connected to the connecting plate via the rotating shaft; the fixing assembly is arranged on the outer wall of the manhole door cover, and the manhole door cover is locked and fixed to the manhole cylinder section via the fixing assembly.

[0012] Compared with the prior art, the utility model has the following technical effects:

[0013] The utility model provides a novel manhole door cover fixing structure, which can replace the original elliptical outer cover. By setting a rotating component, it effectively reduces the opening and closing operation errors of the manhole door caused by human factors, and improves the installation, opening and closing efficiency of the manhole door. At the same time, a fixing component is set to reduce the number of fasteners and improve assembly efficiency, which brings direct benefits to the work on the nuclear power maintenance site and reduces labor and time costs.

[0014] Furthermore, the fixing assembly includes a fixing strip, a first fastener and two second fasteners; the fixing strip is horizontally arranged at the opening of the manhole cylinder section, the middle part of which is connected and fixed to the outer wall of the manhole door cover through the first fastener, and the two ends are respectively locked and fixed to the manhole cylinder section on the outer edge of the manhole door cover through the second fasteners.

[0015] Further, the first fastener includes a first fixing head, a first manhole stud, a first locking nut and a first washer, the first fixing head is arranged on the outer wall of the manhole door cover, one end of the first manhole stud is screwed on the first fixing head, and the other end passes through the fixing strip, the first locking nut is tightened on the end of the first manhole stud passing through the fixing strip, and the first washer is arranged between the first locking nut and the fixing strip to improve the stability of the first fastener; any second fastener includes a second fixing head, a second manhole bolt and a second washer, the second fixing head is arranged on the outer wall of the manhole cylinder section corresponding to the fixed pressure head, one end of the second manhole bolt is screwed on the second fixing head, and the other end passes through the fixing strip, and the second washer is sleeved on the end of the second manhole bolt passing through the fixing strip.

[0016] Furthermore, the device further comprises a detection component, which is arranged on the opposite side walls of the manhole cylinder section opening, and a limit groove is provided on the manhole door cover at a position corresponding to the detection component. The function of the detection component is to observe whether the manhole door cover is closed in place, and through the cooperation between the detection component and the limit groove, it can be intuitively known whether the manhole door cover is closed in place.

[0017] Furthermore, the device also includes an opening and closing assembly, which includes a support plate and a rib plate, which are welded on the outer wall of the manhole door cover to form a "T"-shaped structure. The opening and closing assembly is arranged on the outer wall of the manhole door cover to provide a fulcrum for the special tool to assist in the opening and closing of the manhole door cover.

[0018] Furthermore, a gasket fixing piece for engaging the elliptical gasket is provided at the bottom of the limiting groove; the gasket fixing piece includes a card and a fixing screw, the card is bent at 90°, one end of which is closely arranged at the bottom of the limiting groove, and the other end is bent toward the side wall of the manhole door cover, and abuts against the elliptical gasket arranged on the boss surface of the manhole cylinder section. Gasket fixing pieces are designed at the slots on both sides of the manhole outer cover, and the card is fixed with a fixing screw to press the elliptical gasket tightly to prevent the gasket from moving during installation or closing of the manhole door cover.

[0019] Furthermore, a groove and a through hole are provided on the connecting plate, and one end of the rotating shaft passes through the groove and the through hole in sequence and is fixed by a fixing pin.

[0020] Furthermore, a ring plate is fixedly arranged on the groove, a limit retaining ring is fixedly arranged on the rotating shaft, and the limit retaining ring abuts against the ring plate.

[0021] Furthermore, the rotating assembly further comprises reinforcing ribs, and the reinforcing ribs are arranged on the rotating shaft. The utility model optimizes the rotating shaft design, adds reinforcing ribs on the rotating shaft, improves the rigidity of the rotating shaft, and effectively reduces the situation where the manhole door falls due to its own weight.

[0022] Furthermore, the rotating assembly also includes a pad and a rib plate, the pad is arranged on the inner wall of the manhole door cover, the rib plate is fixedly arranged on the pad, and the ear plate is arranged on the rib plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is an inner side view of an inner-tightening manhole door device during installation.

[0024] Figure 2 This is an outer side view of an inner-tightening manhole door device of the utility model during installation.

[0025] Figure 3 The utility model is a cross-sectional view of an inner-tightening manhole door device during installation.

[0026] Figure 4 for Figure 3 A detailed enlarged view of area A.

[0027] Among them, the accompanying drawings illustrate, 1-manhole cylinder section; 2-manhole door cover; 3-rotating assembly; 4-fixing assembly; 5-support assembly; 6-block; 11-connecting plate; 12-ring plate; 13-elliptical gasket; 21-limiting groove; 22-card; 23-fixing screw; 31-rotating shaft; 32-limiting retaining ring; 33-first fixing pin; 34-fixing nut; 35-first pad; 36-first rib plate; 37-ear plate; 38-reinforcement rib; 39-second fixing pin; 41-fixing pressure strip; 42-first fastener; 43-second fastener; 421-first fixing head; 422-first manhole bolt; 423-first locking nut; 424-first washer; 51-support plate; 52-second rib plate; 111-connecting plate groove; 112-connecting plate through hole. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings of the specification. However, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, and the protection scope of the utility model is not limited thereto.

[0029] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0030] It should be noted that, in the present utility model, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] Example 1

[0032] See also Figure 1-3 The present embodiment provides an inner-tightening manhole door device, which is arranged at the manhole door head. The device includes a manhole cylinder section 1, a manhole door cover 2, a rotating component 3 and a fixing component 4. The manhole door cover 2 is rotatably connected and fixed to a connecting plate 11 on the inner wall of the manhole cylinder section 6 head through the rotating component 4. The fixing component 4 is arranged on the outer wall of the manhole door cover 2. The manhole door cover 2 is locked and fixed to the manhole cylinder section 1 on the outer edge of the manhole door cover 2 through the fixing component 4 to form a complete inner-tightening manhole door structure.

[0033] Specifically, Figure 1 and Figure 3 As shown, a connecting plate through hole 112 and a connecting plate groove 111 for fixing the rotating shaft 31 are provided on the connecting plate 11 on the inner wall of the head of the manhole cylinder section 1. The connecting plate through hole 112 is provided in the middle of the bottom plate of the connecting plate 11, and the connecting plate groove 111 is provided on the top plate of the connecting plate 11, and the notch thereof faces the direction of the manhole door cover 2. A ring plate 12 is provided on the top plate of the connecting plate 11, and the ring plate 12 is welded and fixed just above the connecting plate groove 111. A rotating assembly 3 is arranged between the connecting plate 11 and the manhole door cover 2. During the opening or closing process of the manhole door cover 2, the rotating assembly 3 can rotate on the connecting plate, thereby realizing the rotation of the manhole door cover 2; the rotating assembly 3 includes a rotating shaft 31, a limit retaining ring 32, a first fixing pin 33, a fixing nut 34, a first pad 35, a first rib plate 36 and an ear plate 37. One end of the rotating shaft 31 passes through the ring plate 12, the connecting plate groove 111 and the connecting plate through hole 112 in sequence, and a transverse first fixing pin 33 is arranged on the end of the rotating shaft 31 passing through the connecting plate through hole 112. The first fixing pin 33 fixes the rotating shaft 31 on the connecting plate 11, and the limit retaining ring 32 is annularly arranged and welded to the rotating shaft 31. The rotating shaft 31 passes through the ring plate 12, and the ring plate 12 abuts against the limit retaining ring 32. The rotation of the control shaft 31 is controlled; the other end of the rotation shaft 31 is connected and fixed to the inner wall of the manhole door cover 2 through the ear plate 37, the first pad 35 and the first rib plate 36. The first pad 35 is welded and fixed to the middle position of the inner wall of the manhole door cover 2 to increase the force-bearing area and make the manhole door more evenly stressed. The two first rib plates 36 are welded and fixed to the opposite sides of the first pad 35, and the ear plate 37 is welded and fixed to the other opposite side of the first pad 35. The rib plate 36 and the ear plate 37 form a frame structure, which increases the rigidity of the overall structure and makes the load-bearing more stable. The frame structure is finally welded to the first pad 35 to avoid the frame structure being directly welded to the manhole cover and weakening the strength of the manhole door. The end of the rotation shaft 31 passes through the ear plate hole on the ear plate 37 and is then tightened by the fixing nut to achieve the fixation of the rotation shaft 31 and the manhole door cover 2.

[0034] Specifically, Figure 2 and Figure 3As shown, the manhole door cover 2 is tightly fixed to the manhole barrel section 1 through two fixing components 4. The fixing component 4 includes a first fastener 42, two second fasteners 43 and a fixing strip 41. The fixing strip 41 is horizontally arranged at the opening of the manhole barrel section 1, and the middle part thereof is locked and fixed to the manhole door cover 2 through the first fastener 42. The first fastener 42 includes a first fixing head 421, a first manhole stud 422, a first locking nut 423 and a first washer 424; the first fixing head 421 is a threaded head, which is welded and fixed to the outer wall of the manhole door cover 2, one end of the first manhole stud 422 is screwed into the first fixing head 421, and the other end passes through the fixing strip 41, and is locked and fixed by the first locking nut 423, and a first washer 424 is arranged between the first locking nut 423 and the fixing strip 41 to improve the stability of the first fastener 42;

[0035] The two ends of the fixed pressure strip 41 are locked and fixed to the manhole barrel section 1 on the outer edge of the manhole door cover 2 through two second fasteners 43. The second fastener 43 similarly includes a second fixing head, a second manhole bolt and a second washer. The installation and fixing method is the same as the first fastener 42. The installation method of the fixed pressure strip 41 on the manhole barrel section 1 refers to the process of connecting and fixing it with the manhole door cover 2, which will not be described in detail here. In this embodiment, the second manhole stud is a hexagonal head bolt.

[0036] Based on the above scheme, when the manhole door device of this embodiment is installed and used, a connecting plate 11 is welded on the inner wall of the head of the manhole cylinder section 1. The connecting plate 11 and the rotating shaft 31 are assembled together through a nut and a limit ring 32. The other end of the rotating shaft 31 is connected to the manhole door cover 2. The manhole door cover 2 can rotate around the rotating shaft 31, and the rotating shaft 31 can also rotate around the connecting plate 11 welded on the head, so as to complete the opening or closing of the manhole door cover 2; at the same time, a fixing component 4 is arranged on the outer wall of the manhole door cover 2 to ensure that the manhole door cover 2 and the manhole cylinder section 1 are fastened in place, thereby improving the sealing of the equipment.

[0037] Example 2

[0038] On the basis of not changing other structures of Example 1, this embodiment adds a detection component at the opening of the manhole cylinder section 1 to identify whether the manhole door cover is closed in place.

[0039] like Figure 3 As shown, limiting grooves 21 are provided on both sides of the outer wall of the manhole door cover 2, and the detection component is a clamping block 6, which is welded to the opposite sides of the inner wall of the opening of the manhole cylinder section 1, and can be engaged in the limiting grooves 21 on both sides of the manhole door cover 2. When the manhole door cover 2 is closed, by observing the matching relationship between the clamping block 6 and the limiting groove 21, it can be intuitively judged whether the manhole door cover 2 is closed in place.

[0040] Furthermore, a gasket fixing part is arranged at the bottom of the limiting groove 21 on both sides of the manhole door cover 2, and the gasket fixing part includes a fixing screw 23 and a card 22. The card 22 is bent at 90°, one end of which is tightly arranged at the bottom of the limiting groove 21, and the other end is bent toward the left and right side walls of the manhole door cover 2, and abuts against the elliptical gasket 13 arranged on the boss surface of the manhole cylinder section 1. The fixing screw 23 tightens the card 22 to the bottom of the limiting groove 21, thereby fixing the position of the card 22. The card 22 presses the elliptical gasket 13 to prevent the elliptical gasket 13 from moving during installation or closing of the manhole door.

[0041] In other embodiments, considering that the manhole door cover 2 is heavy, the gap between the rotating shaft 31 and the connecting plate 11 is large, the rotating shaft 31 is overloaded and causes a large deformation, resulting in inaccurate assembly, easy jamming of the rotating shaft structure, and difficulty in reinstalling the manhole. In this embodiment, reinforcing ribs 38 are added to the rotating shaft 31 through finite element analysis and calculation, as shown in the following example. Figure 1 As shown, the provision of the reinforcing ribs 38 can improve the rigidity of the rotating shaft 31, reduce the phenomenon of the manhole door cover 3 falling due to its own weight, and improve the assembly accuracy.

[0042] In other embodiments, Figure 2 and Figure 3 As shown, an opening and closing assembly 5 is installed on the outer wall of the manhole door cover 2 to assist in the opening and closing of the manhole door cover 2; the opening and closing assembly 5 includes a support plate 51 and a second rib plate 52, and the support plate 51 and the second rib plate 52 are welded to the outer wall of the manhole door cover 2 to form a "T"-shaped structure, which provides a rooting point for the use of special tools to assist in the opening and closing of the manhole door cover 2. For example, the operator uses the manhole cylinder section 1 as a fulcrum for the crowbar and the bottom of the T-shaped structure as a rooting point to complete the operation of lifting the manhole door cover 2.

[0043] In other embodiments, Figure 1 As shown, a second fixing pin 39 is provided on the fixing nut 34 to enhance the connection stability of the rotating shaft 31 .

[0044] The various technical features in the above implementation modes can be combined arbitrarily as long as there is no conflict or contradiction between the combinations of features. However, due to space limitations, they are not described one by one.

[0045] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An inner-tightening manhole door device, comprising a manhole barrel section and a manhole door cover, wherein a connecting plate is arranged on the inner wall of the head of the manhole barrel section, characterized in that: A rotating assembly and a fixed assembly; the rotating assembly includes a rotating shaft, a fixing pin, an ear plate and a fixing nut; the ear plate is fixed to the middle part of the inner wall of the manhole door cover, one end of the rotating shaft passes through the ear plate and is locked and fixed by the fixing nut; the other end of the rotating shaft passes through the connecting plate, the fixing pin is arranged on the end of the rotating shaft passing through the connecting plate, and the manhole door cover is rotatably connected to the connecting plate via the rotating shaft; the fixing assembly is arranged on the outer wall of the manhole door cover, and the manhole door cover is locked and fixed to the manhole cylinder section via the fixing assembly.

2. The inner-tightening manhole door device according to claim 1, characterized in that: The fixing assembly includes a fixing strip, a first fastener and two second fasteners; the fixing strip is horizontally arranged at the opening of the manhole cylinder section, the middle part of which is connected and fixed to the outer wall of the manhole door cover by the first fastener, and the two ends are respectively locked and fixed to the manhole cylinder section on the outer edge of the manhole door cover by the second fasteners.

3. The inner-tightening manhole door device according to claim 2, characterized in that: The first fastener includes a first fixing head, a first manhole stud, and a first locking nut. The first fixing head is arranged on the outer wall of the manhole door cover. One end of the first manhole stud is screwed on the first fixing head, and the other end passes through the fixing strip. The first locking nut is tightened on the end of the first manhole stud passing through the fixing strip; any second fastener includes a second fixing head, a second manhole bolt, and a second washer. The second fixing head is arranged on the outer wall of the manhole cylinder section corresponding to the fixed pressure head. One end of the second manhole bolt is screwed on the second fixing head, and the other end passes through the fixing strip. The second washer is sleeved on the end of the second manhole bolt passing through the fixing strip.

4. The inner-tightening manhole door device according to claim 1, characterized in that: It also includes a detection component, which is arranged on the opposite side walls of the manhole cylinder section opening, and a limiting groove is provided on the manhole door cover at a position corresponding to the detection component.

5. The inner-tightening manhole door device according to claim 1, characterized in that: It also includes an opening and closing assembly, which includes a support plate and a rib plate, and the support plate and the rib plate are welded to the outer wall of the manhole door cover to form a "T"-shaped structure.

6. The inner-tightening manhole door device according to claim 4, characterized in that: A gasket fixing piece for engaging an elliptical gasket is provided at the bottom of the limiting groove; the gasket fixing piece includes a card and a fixing screw, the card is bent at 90°, one end of which is tightly arranged at the bottom of the limiting groove, and the other end is bent toward the side wall of the manhole door cover, and abuts against the elliptical gasket arranged on the boss surface of the manhole cylinder section.

7. The inner-tightening manhole door device according to claim 1, characterized in that: The connecting plate is provided with a groove and a through hole, and one end of the rotating shaft passes through the groove and the through hole in sequence and is fixed by a fixing pin.

8. The inner-tightening manhole door device according to claim 7, characterized in that: A ring plate is fixedly arranged on the groove, and a limit retaining ring is fixedly arranged on the rotating shaft, and the limit retaining ring abuts against the ring plate.

9. The inner-tightening manhole door device according to claim 1, characterized in that: The rotating assembly further comprises reinforcing ribs, and the reinforcing ribs are arranged on the rotating shaft.

10. The inner-tightening manhole door device according to claim 1, characterized in that: The rotating assembly also includes a pad and a rib plate, wherein the pad is arranged on the inner wall of the manhole door cover, the rib plate is fixedly arranged on the pad, and the ear plate is arranged on the rib plate.

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