Temporary sealing device for tank manhole

Abstract

This utility model belongs to the technical field of large tank production equipment, and discloses a temporary sealing device for a tank manhole, including a fixing frame and an arc-shaped sealing plate that can be fitted to the inner wall of the tank; at least two screws are hinged to the upper part of the arc-shaped sealing plate, and a sealing element is provided on its upper surface; the top of the screws passes through a pre-set through hole in the fixing frame and is connected to a nut; the width of the arc-shaped sealing plate is smaller than the length of the manhole, so that the arc-shaped sealing plate can be inserted into the tank through the manhole. Compared with the finished product door, this utility model has a simpler structure and lower cost. It can be disassembled and sealed from the inside of the tank, adopts a surface sealing structure, has good sealing performance and pressure resistance, and is easy to disassemble, which can meet the need for temporary sealing of the manhole during pressure holding tests.

Description

Technical Field

[0001] This utility model belongs to the technical field of large tank production equipment and relates to a temporary sealing device for tank manholes. Background Technology

[0002] For large tanks requiring pressure resistance, a pressure holding test is generally required after welding. After passing the pressure holding test, further processes such as cleaning, grinding to remove rust, and pickling passivation are necessary. Therefore, manholes located on the side walls of the tank cannot be fitted with doors at this stage. Furthermore, finished manhole doors have complex structures, requiring sealing, pressure detection, and locking mechanisms, as illustrated in patent application number 202221403242.1, "A Safety Manhole Opening and Closing Mechanism and Pressure Vessel." Therefore, using finished manhole doors to seal the manholes during the pressure holding test is uneconomical and prone to damage. However, temporary sealing of the manholes is necessary for the pressure holding test. Existing manhole sealing devices, such as those described in patent application number 201921913254.7, "A Temporary Manhole Sealing Structure for Steel Box Girder," lack sealing and pressure resistance, making them unsuitable for pressure holding tests. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a temporary sealing device for a tank manhole. The purpose is to design a detachable sealing device with good sealing and pressure resistance so as to temporarily seal the manhole during the pressure holding test and remove it after the pressure holding test, so as to meet the temporary needs of the pressure holding test.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a temporary sealing device for a tank manhole, comprising a fixing frame that can be mounted on the outer edge of the manhole; and an arc-shaped sealing plate that can be fitted against the inner wall of the tank; the arc-shaped sealing plate is large enough to cover the manhole, and at least two screws are hinged to its upper part, with a sealing element on its upper surface for sealing the gap between the arc-shaped sealing plate and the inner wall of the tank; the top of the screws passes through a pre-set through hole in the fixing frame and is connected to a nut; the width of the arc-shaped sealing plate is smaller than the length of the manhole, so that the arc-shaped sealing plate can be inserted into the tank through the manhole.

[0005] As a further optimization, the seal includes an annular sealing gasket adhered to the upper surface of the arc-shaped sealing plate.

[0006] As a further optimization, the upper surface of the arc-shaped sealing plate is provided with an annular groove, and the sealing element also includes a sealing strip embedded in the annular groove; the sealing strip is located inside the annular sealing gasket and has a cavity inside.

[0007] As a further optimization, an annular baffle is fixedly provided on the upper surface of the arc-shaped sealing plate; an annular gap is left between the annular baffle and the side wall of the manhole; a hinge seat is fixedly connected to the inner wall of the annular baffle; a hinge shaft is fixedly provided at the lower end of the screw, and the hinge shaft is inserted into the hinge seat for hinge connection between the upper part of the arc-shaped sealing plate and the screw.

[0008] As a further optimization, both ends of the pull rod are fixed to the inner wall of the annular baffle; one end of the pull rope is connected to the pull rod, and the other end is connected to the fixed frame.

[0009] As a further optimization, the fixing frame includes a longitudinal beam arranged along the length of the manhole, two transverse beams along the width of the manhole being integrally formed with the longitudinal beam, and a through hole provided at the junction of the longitudinal beam and the transverse beam; a rope hole is provided in the middle of the longitudinal beam for connecting the pull rope.

[0010] Compared with existing technologies, the advantages of this utility model are: This utility model has a simpler structure and lower cost compared to pre-made storage doors, and replacement is more economical even if damaged. This device can detachably seal the manhole from the inside of the tank, employing a surface sealing structure that provides excellent sealing and pressure resistance; it is also easy to disassemble, meeting the need for temporary closure of the manhole during pressure testing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure when sealing a manhole according to an embodiment of the present invention;

[0012] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the arc-shaped sealing plate entering and exiting the manhole according to an embodiment of the present invention.

[0014] The correspondence between the technical features in the figure and the reference numerals is as follows: tank body 1; manhole 11; length of manhole 12; fixing frame 2; longitudinal beam 21; cross beam 22; rope hole 23; arc-shaped sealing plate 3; annular sealing gasket 31; annular groove 32; sealing strip 33; annular baffle 34; hinge seat 35; pull rod 36; width of arc-shaped sealing plate 37; screw 4; nut 5. Detailed Implementation

[0015] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model, and are not intended to limit the protection scope of this utility model.

[0016] Example: Please refer to Figure 1-3 This utility model provides the following technical solution: a temporary sealing device for a tank manhole, including a fixing frame 2 that can be mounted on the outer edge of the manhole 11; and an arc-shaped sealing plate 3 that can be fitted against the inner wall of the tank 1; the arc-shaped sealing plate 3 is large enough to cover the manhole 11, and at least two screws 4 are hinged to its upper part, and a sealing element is provided on its upper surface for sealing the gap between the arc-shaped sealing plate 3 and the inner wall of the tank 1; the top of the screws 4 passes through a pre-set through hole in the fixing frame 2 and is connected to a nut 5; the width 37 of the arc-shaped sealing plate is smaller than the length 12 of the manhole, so that the sealing plate can be inserted into the tank 1 through the manhole 11.

[0017] In use, first, the screw 4 is flipped so that it is close to the arc-shaped sealing plate 3 to reduce its thickness, allowing the arc-shaped sealing plate 3 to pass through the manhole 11. Then, the arc-shaped sealing plate 3 is erected, and since the width 37 of the arc-shaped sealing plate is less than the length 12 of the manhole, the arc-shaped sealing plate 3 is inserted into the tank body 1. Then, the direction of the arc-shaped sealing plate 3 is flipped so that its length and width are aligned with the length and width of the manhole 11. Then, one of the screws 4 is picked up, erected, and passed through the through hole, and the nut 5 is screwed on. At this time, the fixing bracket 2 is set at the outer edge of the manhole 11. Then, the other screw 4 is picked up and connected to the fixing bracket 2 through the nut 5. Then, the two nuts 5 are tightened, so that the arc-shaped baffle is pulled up and the sealing element on its upper surface is pressed, thereby sealing the gap between the arc-shaped baffle and the inner wall of the tank body 1, thus sealing the manhole 11.

[0018] During dismantling, first remove one of the nuts 5, then pull up the screw 4 corresponding to nut 5 to prevent the arc-shaped sealing plate 3 from falling off. Then remove the other nut 5 to separate the fixing frame 2 from the arc-shaped sealing plate 3, and remove the fixing frame 2 from the outside of the manhole 11. Next, grab the arc-shaped baffle and move it a distance into the tank 1 until the direction of the arc-shaped sealing plate 3 can be adjusted so that the arc-shaped sealing plate 3 is upright and its width direction is consistent with the length 12 of the manhole. Taking advantage of the fact that the width 37 of the arc-shaped sealing plate is less than the length 12 of the manhole, remove the arc-shaped sealing plate 3 from the tank 1; thus completing the dismantling of this device.

[0019] For example, the seal includes an annular sealing gasket 31 adhered to the upper surface of the arc-shaped sealing plate 3. The annular sealing gasket 31 may be a rubber gasket, and its edge may be flush with the edge of the arc-shaped sealing plate 3, providing a surface seal and good sealing effect.

[0020] More preferably, the upper surface of the arc-shaped sealing plate 3 is provided with an annular groove 32, and the sealing element further includes a sealing strip 33 embedded in the annular groove 32; the sealing strip 33 is located inside the annular sealing gasket 31, and has a cavity inside. The sealing strip 33 is embedded in the arc-shaped sealing plate 3 and will not fall off. Utilizing the cavity, it has better elasticity, making the sealing strip 33 easier to compress. Its position is closer to the inner wall of the manhole 11 than the annular sealing gasket 31. When the arc-shaped sealing plate 3 is pulled upward, its compression degree is greater, and when the sealing strip 33 is compressed, it will not hinder the annular sealing gasket 31 from being pressed tight. At this time, the annular sealing gasket 31 and the sealing strip 33 form a double sealing structure, improving the sealing effect.

[0021] Preferably, an annular baffle 34 is fixedly provided on the upper surface of the arc-shaped sealing plate 3; an annular gap is left between the annular baffle 34 and the side wall of the manhole 11; a hinge seat 35 is fixedly connected to the inner wall of the annular baffle 34; a hinge shaft is fixedly provided at the lower end of the screw 4, and the hinge shaft is inserted into the hinge seat 35 for hinged connection between the upper part of the arc-shaped sealing plate 3 and the screw 4. The annular baffle 34 serves two purposes: firstly, it increases the strength of the arc-shaped sealing plate 3; secondly, it acts as a limiting and positioning component. As long as the arc-shaped baffle can be inserted into the manhole 11, misalignment between the arc-shaped sealing plate 3 and the manhole 11 can be avoided. Furthermore, when the annular gap is uniform in width, it indicates that the arc-shaped sealing plate 3 is directly below the manhole 11, facilitating monitoring of the installation position of the arc-shaped sealing plate 3 from the outside.

[0022] To prevent the arc-shaped sealing plate 3 from accidentally falling into the tank 1, both ends of the pull rod 36 are fixed to the inner wall of the annular baffle 34; one end of the pull rope is connected to the pull rod 36, and the other end is connected to the fixing frame 2. Thus, when placing the arc-shaped sealing plate 3, the fixing frame 2 connected by the pull rope can prevent the arc-shaped sealing plate 3 from falling.

[0023] For example, the fixing frame 2 includes a longitudinal beam 21 arranged along the length direction of the manhole 11, two transverse beams 22 arranged along the width direction of the manhole 11 and the longitudinal beam 21 are fixed together, and the through hole is provided at the junction of the longitudinal beam 21 and the transverse beam 22; the middle of the longitudinal beam 21 is provided with a rope hole 23 for connecting the pull rope.

[0024] The advantage of this embodiment is that it is simpler and cheaper than a finished product door, and even if it is damaged and needs to be replaced, it is more economical than a finished product door. This device can detachably seal the manhole 11 from the inside of the tank 1, using a surface sealing structure, which has good sealing performance and pressure resistance; and it is easy to remove, which can meet the need for temporary closure of the manhole 11 during pressure holding tests.

[0025] The parts of this utility model not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A temporary sealing device for a tank manhole, comprising a fixing frame (2) that can be mounted on the outer edge of the manhole (11); characterized in that: It also includes an arc-shaped sealing plate (3) that can fit against the inner wall of the tank (1); the size of the arc-shaped sealing plate (3) can cover the manhole (11), and at least two screws (4) are hinged to its upper part. A sealing element is provided on its upper surface to seal the gap between the arc-shaped sealing plate (3) and the inner wall of the tank (1); the top of the screw (4) passes through the pre-set through hole of the fixing frame (2) and is connected to the nut (5); The width (37) of the arc-shaped sealing plate is less than the length (12) of the manhole, so that the arc-shaped sealing plate (3) can be inserted into the tank (1) through the manhole (11).

2. The temporary sealing device for the manhole of the tank according to claim 1, characterized in that: The sealing element includes an annular sealing gasket (31) bonded to the upper surface of the arc-shaped sealing plate (3).

3. The temporary sealing device for the manhole of the tank according to claim 2, characterized in that: The upper surface of the arc-shaped sealing plate (3) is provided with an annular groove (32); the sealing element also includes a sealing strip (33) embedded in the annular groove (32); the sealing strip (33) is located inside the annular sealing gasket (31) and has a cavity inside.

4. The temporary sealing device for the manhole of the tank according to claim 1, characterized in that: An annular baffle (34) is fixedly provided on the upper surface of the arc-shaped sealing plate (3); an annular gap is left between the annular baffle (34) and the side wall of the manhole (11); a hinge seat (35) is fixedly connected to the inner wall of the annular baffle (34); a hinge shaft is fixedly provided at the lower end of the screw (4), and the hinge shaft is inserted into the hinge seat (35) for hinge connection between the upper part of the arc-shaped sealing plate (3) and the screw (4).

5. The temporary sealing device for the manhole of the tank according to claim 4, characterized in that: The two ends of the pull rod (36) are respectively fixed to the inner wall of the annular baffle (34); one end of the pull rope is connected to the pull rod (36), and the other end is connected to the fixed frame (2).

6. The temporary sealing device for the manhole of the tank according to claim 5, characterized in that: The fixing frame (2) includes a longitudinal beam (21) arranged along the length direction of the manhole (11); two transverse beams (22) along the width direction of the manhole (11) are fixed together with the longitudinal beam (21); the through hole is provided at the junction of the longitudinal beam (21) and the transverse beam (22); the middle of the longitudinal beam (21) is provided with a rope hole (23) for connecting the pull rope.

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