Bell end plug for coating cement lining of nodular cast iron pipe

Abstract

The utility model relates to a bellmouth plug for coating a cement lining of a nodular cast iron pipe, which belongs to the technical field of bellmouth plugs and comprises an outer ring, an inner ring and a cast pipe, the inner ring is movably mounted on the inner side of the outer ring, a retaining block penetrating to the outer surface of the outer ring is rotatably mounted on the side surface of the inner ring, a check block is fixedly mounted on the inner side of the outer ring, and the cast pipe is fixedly mounted on the check block. And four compression springs are fixedly mounted between the outer ring and the inner ring. According to the bellmouth plug for coating the cement lining of the nodular cast iron pipe, a mechanical locking mode of the compression spring and the retaining block is adopted, compared with an inflatable plug, the bellmouth plug does not need to be inflated and deflated through an air nozzle during disassembly and assembly, and the time for inflating and deflating through the air nozzle is saved, so that the disassembly and assembly speed of the plug is higher, and the bellmouth plug is more suitable for automatic disassembly and assembly of the plug; metal parts are used as a whole, so that compared with a traditional inflatable plug, the inflatable plug is longer in service life and more durable, and the problems that an existing inflatable plug is poor in plugging stability and inconvenient to disassemble and assemble quickly are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of socket plugs, in particular to a socket plug for cement lining coating of ductile iron pipes. Background Art

[0002] Ductile iron pipe is a pipe made by high-speed centrifugal casting using a centrifugal ductile iron casting machine, referred to as ductile iron pipe, ductile iron pipe and cast pipe, etc. Lining the inner wall of ductile iron pipe with cement mortar is a common pipeline anti-corrosion method, mainly used to protect ductile iron pipes from corrosion and wear. The specific implementation process is to seal the socket of the cast pipe, then inject cement mortar into the inside of the cast pipe, and then obtain a tight cement lining layer through high-speed rotation in the centrifugal lining machine. During the cement lining coating process of the cast pipe, a plug device is required to seal the socket to prevent the cement mortar from flowing away. At present, the commonly used socket plug is a rubber inflatable plug, which is composed of an inflatable inner tube and a plastic shell. During use, the socket plug needs to be manually inserted into the socket, and then the inner tube is inflated with an air nozzle. The inner tube expands and presses the plug shell and the inner surface of the socket to complete the installation and fixation. The process of removing the plug is the opposite. First, deflate the inner tube, and then remove the plug.

[0003] However, the existing inflatable plug has the following problems:

[0004] 1. The socket plug is installed manually, and errors are inevitable during the installation process, which will cause gaps between the socket facade and the plug facade, resulting in cement mortar flowing out and flowing into the inner surfaces of the cast pipe socket D5, D6, small grooves, etc., which increases the burden of subsequent socket cleaning. At the same time, the leaked cement mortar will also affect the molding of the lining cement facade, causing quality problems.

[0005] 2. The installation and locking mechanism of the plug adopts an inflatable rubber inner tube. The inner tube is expanded by inflation to press the inner wall of the socket and the plastic shell of the plug to achieve locking. During repeated use, the rubber inner tube and the rough surface of the inner wall of the socket are often rubbed and easily worn, which can easily lead to air leakage of the inflated inner tube, improper installation of the plug, and a short service life.

[0006] 3. Unstable inflation air source pressure will cause the inflated inner tube to be over-inflated or under-inflated. When the rubber inner tube is over-inflated, the inner tube may expand excessively due to excessive air pressure and deform, resulting in gaps that cause mortar to flow out, and more seriously, lead to a tire blowout. When the pressure is insufficient, sufficient locking force cannot be generated between the plug and the socket, causing the plug to loosen.

[0007] 4. When the inflatable plug is in use, the air nozzle is easily blocked by the splashed cement mortar. It can be easily cleaned during manual use, but it is not applicable in the automatic installation of the plug, and it is difficult to automatically clean the air nozzle. In addition, the operation of inflating with an air nozzle is relatively sophisticated, and the automated equipment needs to use a long time in the process of finding the air nozzle and inflating, which cannot adapt to the rhythm of the production line. Therefore, it is necessary to redevelop a plug device that can be quickly disassembled and assembled. Utility Model Content

[0008] In view of the shortcomings of the prior art, the utility model provides a socket plug for cement lining of ductile iron pipes, which has the advantages of easy and quick disassembly and high stability, and solves the problems of poor sealing stability and inconvenience of quick disassembly and assembly of existing inflatable plugs.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a socket plug for cement lining of ductile iron pipe, comprising an outer ring, an inner ring and a cast pipe, the inner ring being movably mounted on the inner side of the outer ring, a stop block penetrating to the outer surface of the outer ring being rotatably mounted on the side surface of the inner ring, a stop block being fixedly mounted on the inner side of the outer ring, and four compression springs being fixedly mounted between the outer ring and the inner ring.

[0010] Furthermore, a rectangular hole is opened on the outer surface of the outer ring, the stop block is located in the rectangular hole, and the inner size of the rectangular hole is larger than the outer size of the stop block.

[0011] Furthermore, the number of the stop blocks and the number of the rectangular holes are both four, the four stop blocks are evenly distributed on the outer surface of the inner ring, and the four rectangular holes are evenly distributed on the outer surface of the outer ring.

[0012] Furthermore, the number of the stop blocks is four, and the four stop blocks are evenly distributed on the inner surface of the outer ring, and the inner ring is located between the stop blocks and the outer ring.

[0013] Furthermore, a connecting rod is rotatably connected between the stop block and the stop block.

[0014] Furthermore, the outer surface of the inner ring is in sliding contact with the inner surface of the outer ring.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] 1. The socket plug for cement lining of ductile iron pipe adopts the mechanical locking method of compression spring and stop block. Compared with the inflatable plug, it does not need to be inflated or deflated by a gas nozzle during disassembly and assembly, which saves the time of inflating or deflation of the gas nozzle. Therefore, the disassembly and assembly speed of the plug is faster, and it is more suitable for automatic disassembly and assembly of the plug. Moreover, metal parts are used as a whole, which has a longer service life and is more durable than traditional inflatable plugs, solving the problems of poor sealing stability and inconvenience in quick disassembly and assembly of existing inflatable plugs.

[0017] 2. The socket plug for cement lining of ductile iron pipe adopts a design in which the outer ring and the inner ring are separated and a compression spring is used to connect the outer ring and the inner ring. During use, after the inner ring is locked with the inner surface of the socket, the outer ring is pressed against the cement facade inside the socket by the spring force and adheres closely to the cement facade, so that the outer ring can achieve good sealing effect and cement facade molding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the connection between the outer ring and the inner ring of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the inner circle of the structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the installation and use of the structure of the utility model.

[0021] In the figure: 1. outer ring; 2. stop block; 3. inner ring; 4. stop block; 5. compression spring; 6. connecting rod; 7. cast pipe; 8. rectangular hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-3In this embodiment, a socket plug for cement lining of a ductile iron pipe comprises an outer ring 1, an inner ring 3 and a cast pipe 7. The inner ring 3 is movably installed on the inner side of the outer ring 1. The outer surface of the inner ring 3 is in sliding contact with the inner surface of the outer ring 1. A stop block 2 penetrating to the outer surface of the outer ring 1 is rotatably installed on the side surface of the inner ring 3. A rectangular hole 8 is opened on the outer surface of the outer ring 1. The stop block 2 is located in the rectangular hole 8. The inner size of the rectangular hole 8 is larger than the outer size of the stop block 2, so that the stop block 2 penetrates to the outer surface of the outer ring 1 and moves on the outer ring 1. The number of the stop block 2 and the rectangular hole 8 is four, and the number of the four stop blocks 2 and the rectangular holes 8 is four. The withdrawal blocks 2 are evenly distributed on the outer surface of the inner ring 3, and the four rectangular holes 8 are evenly distributed on the outer surface of the outer ring 1. A stop block 4 is fixedly installed on the inner side of the outer ring 1. A connecting rod 6 is rotatably connected between the stop block 2 and the stop block 4. The stop block 2 can be limited by the connecting rod 6 to prevent the stop block 2 from over-turning. There are four stop blocks 4, and the four stop blocks 2 are evenly distributed on the inner surface of the outer ring 1. The inner ring 3 is located between the stop block 4 and the outer ring 1. The axial sliding range of the inner ring 3 in the outer ring 1 can be limited by the stop block 4. Four compression springs 5 ​​are fixedly installed between the outer ring 1 and the inner ring 3.

[0024] The working principle of the above embodiment is:

[0025] When the plug is not in use, the stop block 2 of the plug is in an open and locked state. When the stop block 2 is opened, its diameter is larger than the inner diameter of the socket of the cast pipe 7. At this time, the plug cannot be installed. When in use, a special inner tension clamp is required to clamp the clamping surface on the inner side of the outer ring 1 of the clamping head and provide a sufficiently large clamping force. Then the pushing cylinder on the clamping head extends out, supports the inner ring 3 from the outside, and pushes the inner ring 3 inward. Under the action of the pushing cylinder, the inner ring 3 moves inward. In this process, the compression spring 5 and the stop block 2 are compressed on the outside. Under the blocking action of the rectangular hole 8 on the ring 1, the backstop block 2 retracts, and the plug can be installed in the socket of the cast pipe 7. After the plug is in place, the push cylinder retracts, and the inner ring 3 moves outward under the action of the compression spring 5, and at the same time drives the backstop block 2 on the inner ring 3 to move. When the backstop block 2 moves axially, it is affected by the inclined surface of the block 4 and the pull rod 6, and at the same time opens outward to resist the inner surface of the socket to achieve locking. When disassembling, move the inner ring 3 to the side away from the block 4, and drive the backstop block 2 to retract through the inner ring 3.

[0026] It should be noted that, in this article, 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 a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A socket plug for cement lining of ductile iron pipe, comprising an outer ring (1), an inner ring (3) and a cast pipe (7), characterized in that: The inner ring (3) is movably mounted on the inner side of the outer ring (1); a stop block (2) penetrating the outer surface of the outer ring (1) is rotatably mounted on the side surface of the inner ring (3); a stop block (4) is fixedly mounted on the inner side of the outer ring (1); and four compression springs (5) are fixedly mounted between the outer ring (1) and the inner ring (3).

2. The socket plug for cement lining of ductile iron pipe according to claim 1, characterized in that: A rectangular hole (8) is provided on the outer surface of the outer ring (1), the stop block (2) is located in the rectangular hole (8), and the inner dimension of the rectangular hole (8) is larger than the outer dimension of the stop block (2).

3. The socket plug for cement lining of ductile iron pipe according to claim 1, characterized in that: The number of the stop blocks (2) and the number of the rectangular holes (8) are both four. The four stop blocks (2) are evenly distributed on the outer surface of the inner ring (3), and the four rectangular holes (8) are evenly distributed on the outer surface of the outer ring (1).

4. The socket plug for cement lining of ductile iron pipe according to claim 1, characterized in that: The number of the stop blocks (4) is four, and the four stop blocks (2) are evenly distributed on the inner surface of the outer ring (1), and the inner ring (3) is located between the stop blocks (4) and the outer ring (1).

5. The socket plug for cement lining of ductile iron pipe according to claim 1, characterized in that: A connecting rod (6) is rotatably connected between the stop block (2) and the stop block (4).

6. The socket plug for cement lining of ductile iron pipe according to claim 1, characterized in that: The outer surface of the inner ring (3) is in sliding contact with the inner surface of the outer ring (1).

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