A sewer manhole cover with explosion-proof function

Abstract

The present invention relates to a sewer manhole cover, and in particular to a sewer manhole cover with explosion-proof function. The present invention provides a sewer manhole cover with explosion-proof function and high safety performance. A sewer manhole cover with explosion-proof function includes a panel, a disc, a handle plate, a knob, a locking mechanism and a ventilation mechanism. A disc is placed inside the panel, and handle plates are rotatably provided on the left and right sides of the top of the disc to facilitate people to open the disc. Knobs for limiting the handle plates are rotatably provided on the left and right sides of the top of the disc, and the knobs are in contact with the handle plates on the same side. A locking mechanism for locking the disc is provided between the panel and the disc, and a ventilation mechanism for ventilating the sewer is provided between the locking mechanism and the disc. The present invention clamps the disc on the panel, and then locks the panel to prevent the panel from being opened at will, causing an accident. The sliding plate moves inward to open, and then ventilates the sewer to prevent the air pressure generated in the sewer from leaking out and causing an explosion.

Description

Technical Field

[0001] The invention relates to a sewer manhole cover, in particular to a sewer manhole cover with explosion-proof function. Background Art

[0002] In modern cities, sewers are set up and urban planning is carried out to drain sewage and rainwater.

[0003] Authorization announcement number CN111321798B announces a municipal sewer manhole cover, the municipal sewer manhole cover includes a manhole body, a first motor is provided inside the manhole body, the first motor is connected to the first shaft in the up and down directions, a first ratchet is fixed above the first shaft, and a second shaft extending upward is fixed above the first ratchet. The municipal sewer manhole cover provided by the present invention has a simple structure and can realize the function of fully automatic opening and closing of the sewer manhole cover, thereby preventing unauthorized personnel from forcibly opening the sewer and causing accidents. At the same time, the present invention can perform a garbage cleaning function on the sewer manhole cover to prevent the sewer manhole cover from being blocked by garbage and affecting the drainage performance of the manhole cover. However, the manhole cover does not have an explosion-proof function. Therefore, since the sewer is relatively sealed, a large amount of urban garbage flowing into the sewer will produce methane. The amount of methane increases, the concentration continues to increase, and the air pressure increases accordingly. When the methane in the sewer reaches a certain concentration, it will explode when it encounters an open flame or spark. Since the sewer runs through the entire city, once an explosion occurs somewhere, the sewers connected to the sewer will also be affected and may explode. It involves a wide range, has great hazards, and has low safety performance, posing a great threat to people's lives and property.

[0004] How to design a sewer manhole cover with high safety performance and explosion-proof function is the technical problem that this patent needs to solve. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art that the prior art has no explosion-proof function and low safety performance, the technical problem of the present invention is to provide a sewer manhole cover with high safety performance and explosion-proof function.

[0006] The technical implementation scheme of the present invention is: a sewer manhole cover with explosion-proof function, including a surrounding plate, a disc, a handle plate, a knob, a locking mechanism and a ventilation mechanism, a disc is placed on the inner side of the surrounding plate, and handle plates are rotatably provided on the left and right sides of the top of the disc for people to open the disc, and knobs for limiting the handle plates are rotatably provided on the left and right sides of the top of the disc, and the knobs are in contact with the handle plates on the same side, a locking mechanism for locking the disc is provided between the surrounding plate and the disc, and a ventilation mechanism for sewer ventilation is provided between the locking mechanism and the disc.

[0007] Optionally, the locking mechanism includes a connecting circular plate, a first connecting plate, a connecting rod, a rotating block, a wedge-shaped circular plate, a first return spring and a limit strip, connecting circular plates are provided on the front and rear sides of the bottom of the disc, the connecting circular plates are provided with first connecting plates, connecting rods are slidably provided on the lower side of the first connecting plates, the connecting rods are connected to the first connecting plates on the same side with the first return springs, rotating blocks are provided on the outer sides of the connecting rods, wedge-shaped circular plates are provided on the front and rear sides of the inner side of the enclosure, the rotating blocks are in contact with the wedge-shaped circular plates on the same side, and limit strips for limiting the connecting circular plates are provided on the front and rear sides of the inner side of the enclosure, and the disc is placed on the two limit strips.

[0008] Optionally, the ventilation mechanism includes a first connecting inclined plate, a second connecting plate, a connecting round rod, a sliding plate, a limiting round rod and a second return spring. A first connecting inclined plate is provided on the inner sides of the two connecting rods. Five limiting round rods are symmetrically provided on the left and right sides of the disk. There are twenty limiting round rods in total. Sliding plates are slidably provided between five adjacent limiting round rods. A connecting round rod is connected between the bottoms of two adjacent sliding plates. A second connecting plate is provided on the connecting round rods. The second connecting plates are in contact with the first connecting inclined plates on the same side. Five second return springs are connected between the sliding plates and the disk. There are twenty second return springs in total. The second return springs are all sleeved on the limiting round rods on the same side.

[0009] Optionally, it also includes a fixing mechanism for strengthening the sewer manhole cover with explosion-proof function to be fixed to the sewer outlet, the fixing mechanism including a connecting soft plate, a circular movable plate, a movable connecting block, a second connecting inclined plate, a movable rod rack, a limiting square rod, a third reset spring and a third connecting plate. Connecting soft plates are provided on the left and right sides of the bottom of the disc, a circular movable plate is provided between the connecting soft plates, a movable connecting block is slidably provided in the middle of the disc, the bottom of the movable connecting block is connected to the circular movable plate, and second connecting inclined plates are rotatably provided on the left and right sides of the lower part of the movable connecting block. Two limiting square rods are provided on the front and back sides of the bottom of the disc, and a third connecting plate is slidably provided between the two limiting square rods on the left and right sides. The third connecting plate is rotatably connected to the second connecting inclined plate on the same side, and a third reset spring is connected between the limiting square rod and the third connecting plate on the same side. A movable rod rack for clamping on the inner wall of the sewer is provided on the third connecting plate.

[0010] Optionally, a retractable mechanism is also included to prevent explosions in sewers. The retractable mechanism includes a thin rod, a hollow thick rod, a first rotating plate, a fourth reset spring and a connecting seat. Four first rotating plates are rotatably provided in the middle of the disc. Two fourth reset springs are connected between the first rotating plates and the disc. Two connecting seats are provided at the bottom of the first rotating plates. Hollow thick rods are rotatably provided on the connecting seats. Thin rods are slidably provided on the inner sides of the hollow thick rods. The bottoms of the thin rods are in contact with the circular movable plate.

[0011] Optionally, a drainage mechanism is also included to further prevent explosions in sewers. The drainage mechanism includes a second rotating plate, a third rotating plate, a hollow plate, a connecting shaft and a first torsion spring. Four hollow plates are evenly spaced in the middle of the bottom of the disc, and four connecting shafts are rotatably provided on the circular movable plate. A second rotating plate is provided on the two inner connecting shafts, and a third rotating plate is provided on the two outer connecting shafts. Two first torsion springs are connected between the two second rotating plates and the two third rotating plates and the circular movable plate, and the first torsion springs are all sleeved on the connecting shafts on the same side.

[0012] Optionally, a warning mechanism for warning people of danger is also included, the warning mechanism includes a connecting hole column, a rotating head corner column, a rotating slide rod, a flashing plate, a limit shaft and a second torsion spring, connecting hole columns are provided on the left and right sides of the movable connecting block, rotating head corner columns are slidably provided on the connecting hole columns, limiting shafts are provided on the left rear side and the right front side of the top of the disk, rotating slide rods are rotatably provided on the limiting shafts, two second torsion springs are connected between the rotating slide rods and the disk, and flashing plates for warning are provided on the rotating slide rods.

[0013] Optionally, a rotating block is rotatably provided on the lower side of the rotating head corner column.

[0014] The present invention has the following advantages:

[0015] 1. The present invention clamps the disc on the enclosure, thereby locking the enclosure to prevent the enclosure from being opened at will and causing an accident. The sliding plate is moved inward to open, thereby ventilating the sewer to prevent the air pressure generated in the sewer from leaking out and causing an explosion;

[0016] 2. The present invention moves the rod rack outward through the enclosure to contact the inner wall of the sewer, and then abuts against the inner wall of the sewer, thereby strengthening the fixation of the manhole cover and preventing the manhole cover from being blown away by the impact of air pressure;

[0017] 3. The present invention drives the thin rod to move upward through the circular moving plate. After the thin rod moves upward to the limit, it drives the hollow thick rod to move upward. The hollow thick rod drives the first rotating plate to rotate and open through the connecting seat, so that the gas pressure generated by the sewer explosion leaks out through the disc, thereby preventing the sewer from exploding.

[0018] 4. The present invention drives the second rotating plate and the third rotating plate to rotate and open through the hollow plate, thereby diverting the gas pressure generated by the sewer explosion through the circular movable plate, further preventing the sewer from exploding;

[0019] 5. The present invention drives the flashing plate to rotate to be perpendicular to the disc by rotating the slide rod, so that the flashing plate can be erected to warn people not to approach. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0023] Figure 4 It is a partial three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the ventilation mechanism of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of location A of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of location B of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the fixing mechanism of the present invention.

[0028] Fig. 9 It is a bottom-up stereoscopic structural schematic diagram of the fixing mechanism of the present invention.

[0029] Fig.10 It is a schematic diagram of the three-dimensional structure at C of the present invention.

[0030] Fig.11 It is a three-dimensional structural schematic diagram of the retractable mechanism of the present invention.

[0031] Fig.12 It is a bottom-up stereoscopic structural schematic diagram of the retractable and unfolding mechanism of the present invention.

[0032] Fig.13 It is a schematic diagram of the three-dimensional structure at D of the present invention.

[0033] Fig.14 It is a schematic diagram of the three-dimensional structure of the drainage mechanism of the present invention.

[0034] Fig.15 It is a schematic diagram of the three-dimensional structure of the drainage mechanism of the present invention when viewed from the left.

[0035] Fig.16 It is a schematic diagram of the three-dimensional structure of location E of the present invention.

[0036] Fig.17 It is a schematic diagram of the three-dimensional structure of the first part of the warning mechanism of the present invention.

[0037] Fig.18 It is a schematic diagram of the three-dimensional structure of F of the present invention.

[0038] Fig.19 It is a schematic diagram of the third part of the structure of the warning mechanism of the present invention.

[0039] The markings of the components in the accompanying drawings are as follows: 1: enclosure, 2: disc, 3: handle plate, 4: knob, 5: locking mechanism, 51: connecting circular plate, 52: first connecting plate, 53: connecting rod, 54: rotating block, 55: wedge-shaped circular plate, 56: first return spring, 57: limiting strip, 6: ventilation mechanism, 61: first connecting inclined plate, 62: second connecting plate, 63: connecting round rod, 64: sliding plate, 65: limiting round rod, 66: second return spring, 7: fixing mechanism, 71: connecting soft plate, 72: circular movable plate, 73: movable connecting block, 74: second connecting inclined plate Plate, 75: movable rod rack, 76: limiting square rod, 77: third return spring, 78: third connecting plate, 8: retracting mechanism, 81: thin rod, 82: hollow thick rod, 83: first rotating plate, 84: fourth return spring, 85: connecting seat, 9: drainage mechanism, 91: second rotating plate, 92: third rotating plate, 93: hollow plate, 94: connecting shaft, 95: first torsion spring, 10: warning mechanism, 101: connecting hole column, 102: rotating head corner column, 103: rotating slide rod, 104: flashing plate, 105: limiting shaft, 106: second torsion spring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0041] Example 1

[0042] A sewer manhole cover with explosion-proof function, referring to Figure 1-7 , including a panel 1, a disc 2, a handle plate 3, a knob 4, a locking mechanism 5 and a ventilation mechanism 6. A disc 2 is placed on the inner side of the panel 1. Handle plates 3 are rotatably provided on the left and right sides of the top of the disc 2. The handle plates 3 are convenient for people to open the disc 2. Knobs 4 are rotatably provided on the left and right sides of the top of the disc 2. The knobs 4 are used to limit the handle plates 3. The knobs 4 are in contact with the handle plates 3 on the same side. A locking mechanism 5 is provided between the panel 1 and the disc 2. The locking mechanism 5 is used to lock the disc 2. A ventilation mechanism 6 is provided between the locking mechanism 5 and the disc 2. The ventilation mechanism 6 is used for sewer ventilation.

[0043] Reference Figure 3-4The locking mechanism 5 includes a connecting circular plate 51, a first connecting plate 52, a connecting rod 53, a rotating block 54, a wedge-shaped circular plate 55, a first return spring 56 and a limit strip 57. Connecting circular plates 51 are provided on the front and rear sides of the bottom of the disc 2. The connecting circular plates 51 are provided with first connecting plates 52. Connecting rods 53 are slidably provided on the lower side of the first connecting plates 52. The connecting rods 53 are connected to the first connecting plates 52 on the same side with the first return springs 56. Rotating blocks 54 are provided on the outer sides of the connecting rods 53. Wedge-shaped circular plates 55 are provided on the front and rear sides of the inner side of the enclosure 1. The rotating blocks 54 are in contact with the wedge-shaped circular plates 55 on the same side. Limit strips 57 are provided on the front and rear sides of the inner side of the enclosure 1. The limit strips 57 are used to limit the connecting circular plates 51, and the disc 2 is placed on the two limit strips 57.

[0044] Reference Figure 5-7 The ventilation mechanism 6 includes a first connecting inclined plate 61, a second connecting plate 62, a connecting round rod 63, a sliding plate 64, a limiting round rod 65 and a second return spring 66. The first connecting inclined plates 61 are provided on the inner sides of the two connecting rods 53. Five limiting round rods 65 are symmetrically provided on the left and right sides of the disc 2. There are twenty limiting round rods 65. Sliding plates 64 are slidably provided between the five adjacent limiting round rods 65. A connecting round rod 63 is connected between the bottoms of two adjacent sliding plates 64. A second connecting plate 62 is provided on the connecting round rod 63. The second connecting plates 62 are in contact with the first connecting inclined plates 61 on the same side. Five second return springs 66 are connected between the sliding plates 64 and the disc 2. There are twenty second return springs 66. The second return springs 66 are all sleeved on the limiting round rods 65 on the same side.

[0045] In the initial state, the first return spring 56 is stretched and the second return spring 66 is compressed. When using the manhole cover, first install the manhole cover on the sewer outlet through the enclosure 1. When people need to open the disc 2, turn the knob 4 to separate the handle plate 3, and then manually raise the handle plate 3. People rotate the disc 2 through the handle plate 3, and the disc 2 drives the connecting circular plate 51, the first connecting plate 52, the connecting rod 53, the rotating block 54, the first return spring 56 and the first connecting inclined plate 61 to rotate, and then the rotating block 54 is driven to move inward under the action of the wedge-shaped circular plate 55, and the rotating block 54 drives the connecting rod 53 moves inward, the first return spring 56 is continuously stretched, and when the rotating block 54 rotates to separate from the wedge-shaped circular plate 55, the rotating block 54 and the connecting rod 53 are driven to move outward and reset under the action of the first return spring 56, and the connecting rod 53 drives the first connecting inclined plate 61 to move inward and separate from the second connecting plate 62, and then the sliding plate 64, the connecting round rod 63 and the second connecting plate 62 are driven to move outward and reset under the action of the second return spring 66, and the sliding plate 64 closes the disc 2. When the connecting circular plate 51 rotates to separate from the limit strip 57, people can open the When opening and resetting the disc 2, the disc 2 is placed on the limit bar 57, and people rotate the disc 2 through the handle plate 3, and the disc 2 drives the connecting circular plate 51, the first connecting plate 52, the connecting rod 53, the rotating block 54, the first reset spring 56 and the first connecting inclined plate 61 to rotate. When the connecting circular plate 51 contacts the limit bar 57, the disc 2 is clamped on the enclosure 1, and the enclosure 1 is locked to prevent the enclosure 1 from being opened at will. At the same time, the rotating block 54 contacts the wedge-shaped circular plate 55, and the wedge-shaped circular plate 55 presses the rotating block 54 inward, and the rotating block 54 drives the connecting rod 53 and the first connecting rod 53. The inclined plate 61 moves inward, and the first return spring 56 is stretched, so that the rotating block 54 is stuck in the middle of the wedge-shaped circular plate 55. At the same time, the first connecting inclined plate 61 moves inward to drive the second connecting plate 62 to move inward, and the second connecting plate 62 drives the connecting round rod 63 to move inward, and then drives the sliding plate 64 to move inward and open, and the second return spring 66 is compressed. In this way, the sewer is ventilated to prevent the air pressure generated in the sewer from leaking out and causing an explosion. Then, the handle plate 3 is reversed and reset, and then the reset knob 4 is reversed. The knob 4 contacts the handle plate 3, thereby limiting the position of the handle plate 3.

[0046] Example 2

[0047] Based on Example 1, Figure 1 , Figure 8 , Fig. 9 and Fig.10, and also includes a fixing mechanism 7, which includes a connecting soft plate 71, a circular movable plate 72, a movable connecting block 73, a second connecting inclined plate 74, a movable rod frame 75, a limiting square rod 76, a third reset spring 77 and a third connecting plate 78. The left and right sides of the bottom of the disc 2 are provided with connecting soft plates 71, and a circular movable plate 72 is provided between the connecting soft plates 71. A movable connecting block 73 is slidably provided in the middle of the disc 2. The bottom of the movable connecting block 73 is connected to the circular movable plate 72. The movable connecting block 73 A second connecting inclined plate 74 is rotatably provided on both the left and right sides of the lower part, two limiting square rods 76 are provided on the front and rear sides of the bottom of the disc 2, and a third connecting plate 78 is slidably provided between the two limiting square rods 76 on the left and right sides. The third connecting plates 78 are rotatably connected to the second connecting inclined plates 74 on the same side, and a third return spring 77 is connected between the limiting square rods 76 and the third connecting plates 78 on the same side. A movable rod rack 75 is provided on the third connecting plate 78, and the movable rod rack 75 is used to be stuck on the inner wall of the sewer.

[0048] The third reset spring 77 then drives the third connecting plate 78 and the movable rod frame 75 to move inwards and resets them, thereby strengthening the fixation of the manhole cover and preventing the manhole cover from being blown away by the impact of the air pressure. After the air pressure decreases, due to the action of gravity, the circular movable plate 72 moves downwards and resets, and the connecting soft plate 71 resets accordingly. The circular movable plate 72 drives the movable connecting block 73 to move downwards and resets, and then drives the third connecting plate 78 and the movable rod frame 75 to move inwards and resets them under the action of the third reset spring 77.

[0049] Reference Figure 1 , Fig.11 , Fig.12 and Fig.13 , also includes a retractable mechanism 8, the retractable mechanism 8 includes a thin rod 81, a hollow thick rod 82, a first rotating plate 83, a fourth reset spring 84 and a connecting seat 85, four first rotating plates 83 are rotatably provided in the middle of the disk 2, two fourth reset springs 84 are connected between the first rotating plates 83 and the disk 2, two connecting seats 85 are provided at the bottom of the first rotating plates 83, hollow thick rods 82 are rotatably provided on the connecting seats 85, thin rods 81 are slidably provided on the inner side of the hollow thick rods 82, and the bottoms of the thin rods 81 are in contact with the circular movable plate 72.

[0050] When the circular movable plate 72 moves upward, it drives the thin rod 81 upward. After the thin rod 81 moves upward to the limit, it drives the hollow thick rod 82 upward. The hollow thick rod 82 drives the first rotating plate 83 to rotate and open through the connecting seat 85. The fourth reset spring 84 is stretched, so that the air pressure generated by the sewer explosion leaks out through the disc 2 to prevent the sewer explosion. When the circular movable plate 72 moves downward and resets, the first rotating plate 83 and the connecting seat 85 are reversed and reset under the action of the fourth reset spring 84, thereby driving the hollow thick rod 82 and the thin rod 81 to move downward. Due to the action of gravity, the thin rod 81 continues to move downward and reset.

[0051] Reference Figure 2 , Fig.14 , Fig.15 and Fig.16 , also includes a drainage mechanism 9, the drainage mechanism 9 includes a second rotating plate 91, a third rotating plate 92, a hollow plate 93, a connecting shaft 94 and a first torsion spring 95, four hollow plates 93 are evenly spaced in the middle of the bottom of the disc 2, four connecting shafts 94 are rotatably provided on the circular movable plate 72, the two inner connecting shafts 94 are each provided with a second rotating plate 91, the two outer connecting shafts 94 are each provided with a third rotating plate 92, two first torsion springs 95 are connected between the two second rotating plates 91 and the two third rotating plates 92 and the circular movable plate 72, and the first torsion springs 95 are each sleeved on the connecting shaft 94 on the same side.

[0052] When the circular movable plate 72 moves upward, it drives the second rotating plate 91, the third rotating plate 92, the connecting shaft 94 and the first torsion spring 95 to move upward. When the second rotating plate 91 and the third rotating plate 92 are in contact with the hollow plate 93 on the same side, the hollow plate 93 drives the second rotating plate 91 and the third rotating plate 92 to rotate and open, the first torsion spring 95 is deformed, and the second rotating plate 91 and the third rotating plate 92 drive the connecting shaft 94 to rotate. In this way, the air pressure generated by the sewer explosion is diverted through the circular movable plate 72 and the disc 2 to further prevent the sewer explosion. When the circular movable plate 72 moves downward and resets, it drives the second rotating plate 91, the third rotating plate 92, the connecting shaft 94 and the first torsion spring 95 to move downward. The second rotating plate 91 and the third rotating plate 92 are separated from the hollow plate 93 on the same side, and then the connecting shaft 94, the second rotating plate 91 and the third rotating plate 92 are reversed and reset under the action of the first torsion spring 95.

[0053] Reference Figure 1 , Fig.17 , Fig.18 and Fig.19, also includes a warning mechanism 10, the warning mechanism 10 includes a connecting hole column 101, a rotating head corner column 102, a rotating slide rod 103, a flashing plate 104, a limiting shaft 105 and a second torsion spring 106, the movable connecting block 73 is provided with a connecting hole column 101 on both sides, the rotating head corner column 102 is slidably provided on the connecting hole column 101, and a rotating block is rotatably provided on the lower side of the rotating head corner column 102, a limiting shaft 105 is provided on the left rear side and the right front side of the top of the disk 2, a rotating slide rod 103 is rotatably provided on the limiting shaft 105, and the rotating slide rod 103 is connected to the disk 2 with two second torsion springs 106, and the rotating slide rod 103 is provided with a flashing plate 104, and the flashing plate 104 serves as a warning.

[0054] When the movable connecting block 73 moves upward, it drives the connecting hole column 101 to move upward, and the connecting hole column 101 drives the rotating head corner column 102 to move upward, and then drives the rotating block to move upward, and the rotating block drives the rotating slide rod 103 to rotate, the second torsion spring 106 is deformed, and the rotating slide rod 103 drives the flashing plate 104 to rotate. When the rotating slide rod 103 rotates to a certain extent, the rotating head corner column 102 drives the rotating block to continue to move upward, and under the action of the rotating slide rod 103, the rotating head corner column 102 is driven to move outward through the rotating block, so that the rotating slide The guide rod 103 and the flashing plate 104 are rotated to be perpendicular to the disc 2, so that the flashing plate 104 can be erected to warn people not to approach. When the movable connecting block 73 moves downward, it drives the connecting hole column 101 downward, and the connecting hole column 101 drives the rotating head corner column 102 downward, and then drives the rotating block downward. The rotating block drives the rotating slide rod 103 to reverse and reset, and the second torsion spring 106 is reset accordingly. At the same time, under the action of the rotating slide rod 103, the rotating block is driven to reverse, and the rotating block and the rotating head corner column 102 are driven to move inward and reset.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sewer manhole cover with explosion-proof function, comprising a panel (1), a disc (2), a handle plate (3) and a knob (4), wherein the disc (2) is placed inside the panel (1), the top of the disc (2) is rotatably provided with handle plates (3) on both left and right sides for facilitating people to open the disc (2), the top of the disc (2) is rotatably provided with knobs (4) for limiting the handle plates (3), and the knobs (4) are in contact with the handle plates (3) on the same side, wherein: It also includes a locking mechanism (5) and a ventilation mechanism (6), wherein a locking mechanism (5) for locking the disk (2) is provided between the enclosure (1) and the disk (2), and a ventilation mechanism (6) for ventilating the sewer is provided between the locking mechanism (5) and the disk (2); The locking mechanism (5) comprises a connecting circular plate (51), a first connecting plate (52), a connecting rod (53), a rotating block (54), a wedge-shaped circular plate (55), a first return spring (56) and a limit strip (57). The bottom of the disc (2) is provided with connecting circular plates (51) on both front and rear sides. The connecting circular plates (51) are provided with first connecting plates (52). The lower side of the first connecting plates (52) is provided with connecting rods (53) in a sliding manner. The connecting rods (53) are connected to the first connecting plates (52) on the same side with the first return spring (56). The outer side of the connecting rods (53) is provided with a rotating block (54). The inner side of the enclosure (1) is provided with wedge-shaped circular plates (55) on both front and rear sides. The rotating blocks (54) are in contact with the wedge-shaped circular plates (55) on the same side. The inner side of the enclosure (1) is provided with limit strips (57) for limiting the connecting circular plate (51). The disc (2) is placed on the two limit strips (57). The ventilation mechanism (6) comprises a first connecting inclined plate (61), a second connecting plate (62), a connecting round rod (63), a sliding plate (64), a limiting round rod (65) and a second return spring (66). The first connecting inclined plate (61) is provided on the inner side of the two connecting rods (53). Five limiting round rods (65) are symmetrically provided on the left and right sides of the disc (2). There are twenty limiting round rods (65). Sliding plates (64) are slidably provided between the five adjacent limiting round rods (65). A connecting round rod (63) is connected between the bottoms of two adjacent sliding plates (64). A second connecting plate (62) is provided on the connecting round rod (63). The second connecting plates (62) are in contact with the first connecting inclined plate (61) on the same side. Five second return springs (66) are connected between the sliding plates (64) and the disc (2). There are twenty second return springs (66). The second return springs (66) are sleeved on the limiting round rods (65) on the same side. The invention also comprises a fixing mechanism (7) for strengthening the sewer manhole cover with explosion-proof function to be fixed to the sewer outlet, the fixing mechanism (7) comprising a connecting soft plate (71), a circular movable plate (72), a movable connecting block (73), a second connecting inclined plate (74), a movable rod rack (75), a limiting square rod (76), a third reset spring (77) and a third connecting plate (78), connecting soft plates (71) are provided on both left and right sides of the bottom of the disc (2), a circular movable plate (72) is provided between the connecting soft plates (71), a movable connecting block (73) is slidably provided in the middle of the disc (2), and the bottom of the movable connecting block (73) is provided with a movable connecting block (73). The movable connecting block (73) is connected to the circular movable plate (72), and second connecting inclined plates (74) are rotatably provided on the left and right sides of the lower part of the movable connecting block (73). Two limiting square rods (76) are provided on the front and rear sides of the bottom of the disc (2), and a third connecting plate (78) is slidably provided between the two limiting square rods (76) on the left and right sides. The third connecting plates (78) are rotatably connected to the second connecting inclined plates (74) on the same side, and a third return spring (77) is connected between the limiting square rods (76) and the third connecting plates (78) on the same side. The third connecting plates (78) are provided with a movable rod bracket (75) for clamping on the inner wall of the sewer.

2. The explosion-proof sewer manhole cover according to claim 1, characterized in that: The utility model also comprises a retractable mechanism (8) for preventing explosion in the sewer, wherein the retractable mechanism (8) comprises a thin rod (81), a hollow thick rod (82), a first rotating plate (83), a fourth return spring (84) and a connecting seat (85), wherein four first rotating plates (83) are rotatably provided in the middle of the disk (2), two fourth return springs (84) are connected between the first rotating plates (83) and the disk (2), two connecting seats (85) are provided at the bottom of the first rotating plates (83), a hollow thick rod (82) is rotatably provided on the connecting seats (85), a thin rod (81) is slidably provided inside the hollow thick rod (82), and the bottom of the thin rod (81) is in contact with the circular movable plate (72).

3. The explosion-proof manhole cover according to claim 2 is characterized in that: The invention also comprises a drainage mechanism (9) for further preventing explosions in the sewer. The drainage mechanism (9) comprises a second rotating plate (91), a third rotating plate (92), a hollow plate (93), a connecting shaft (94) and a first torsion spring (95). Four hollow plates (93) are evenly spaced in the middle of the bottom of the disc (2). Four connecting shafts (94) are rotatably provided on the circular movable plate (72). The second rotating plates (91) are provided on the two inner connecting shafts (94), and the third rotating plates (92) are provided on the two outer connecting shafts (94). Two first torsion springs (95) are connected between the two second rotating plates (91) and the two third rotating plates (92) and the circular movable plate (72). The first torsion springs (95) are sleeved on the connecting shafts (94) on the same side.

4. The explosion-proof sewer manhole cover according to claim 3 is characterized in that: The device also comprises a warning mechanism (10) for warning people of danger. The warning mechanism (10) comprises a connecting hole column (101), a rotating head corner column (102), a rotating slide rod (103), a flashing plate (104), a limiting shaft (105) and a second torsion spring (106). The movable connecting block (73) is provided with a connecting hole column (101) on both the left and right sides. The connecting hole column (101) is slidably provided with a rotating head corner column (102). The top left rear side and the right front side of the disk (2) are provided with a limiting shaft (105). The limiting shaft (105) is rotatably provided with a rotating slide rod (103). Two second torsion springs (106) are connected between the rotating slide rod (103) and the disk (2). The rotating slide rod (103) is provided with a flashing plate (104) for warning.

5. The explosion-proof sewer manhole cover according to claim 4 is characterized in that: A rotating block is rotatably provided on the lower side of the rotating head corner column (102).

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