Fixing ring for cast pipe sleeving

Abstract

The utility model discloses a fixing ring for sleeving a cast pipe, which is used for sleeving and transporting the cast pipe and is arranged between an inner cast pipe and an outer cast pipe which are sleeved, the fixing ring comprises an upper ring and a lower ring which are in a semi-circular cylindrical shape after being pressurized, the inner parts of the upper ring and the lower ring are hollow and closed inner cavities, and the inner cavities are communicated with an air tap fixedly arranged on an outer end face. The matching plates of the upper ring and the lower ring are assembled and then fastened through fasteners. And the matching plate and the fastener are positioned between the inner and outer cast pipes without influencing the fixing rings to fix the inner and outer pipes. In order to simultaneously pressurize the upper and lower rings, the inner cavities of the upper and lower rings are communicated through a hose or the upper and lower rings are combined into an open ring with communicated inner cavities. Installation and pressurizing operation are convenient and fast, the inner pipe is fixed through expansion and friction force of the soft rubber fixing ring and can be recycled, and worm egg quarantine inspection is not needed when the worm eggs enter and exit from customs.

Description

Technical Field

[0001] The utility model is applied in the field of transportation, and relates to the package transportation of ductile iron pipes, in particular to a fixing ring for cast pipe packages. Background Art

[0002] Ductile iron pipes range in size from DN80 to DN3000. During transportation, smaller pipes are typically nested within larger ones to save space and reduce shipping costs. For example, nesting a DN400 pipe within a DN600 pipe can reduce ocean freight costs by approximately 40%. Nesting a DN200 pipe within a DN400 pipe can reduce ocean freight costs by approximately 70%. Currently, the inner pipes in these nests are supported by wooden blocks secured with wire. This presents several challenges: 1) The wooden blocks require insect egg quarantine inspection at customs, increasing costs; 2) the wooden blocks cannot be recycled or reused; and 3) the wooden blocks have point contact with the inner and outer pipes, resulting in weak frictional retention. While damp wooden blocks secure the inner pipes well at the factory, they dry out during transportation, shrinking in size and losing their ability to secure the inner pipes. This can lead to accidents where the pipes fall during loading onto ships. Therefore, the development of retaining rings for these nests became necessary. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a fixing ring for a cast pipe suit, which is made of soft rubber, saves customs insect egg quarantine inspection, is filled with fluid pressure to expand, uses friction and a socket structure to fix the inner pipe, will not cause pipe falling accidents, is easy to install and operate, and can be recycled.

[0004] The technical solution adopted by this utility model is as follows: a fixed ring for the cast pipe set is installed between the inner and outer cast pipes of the set, comprising an upper ring and a lower ring, which are semi-circular and cylindrical after pressurization. The interior of the upper ring is a hollow and closed inner cavity, which is connected to the gas nozzle. The gas nozzle is fixedly mounted on the outer end surface, and a matching plate is mounted on the semi-circular end of the upper ring. The structure of the lower ring is consistent with that of the upper ring. After assembly, the matching plates of the upper and lower rings are fastened with fasteners; the fasteners are located in the radial direction of the fixed ring. The matching plate and fasteners are located between the inner and outer cast pipes, without affecting the outer circumferential surface fixing the outer pipe and the inner circumferential surface fixing the inner pipe. This fixed ring is suitable for two-person matching sets of large-diameter cast pipes.

[0005] Furthermore, in order to realize simultaneous pressure inflation and deformation of the upper and lower rings, the inner cavity of the upper ring and the inner cavity of the lower ring are connected by a hose that can withstand high pressure.

[0006] Furthermore, in order to ensure the stability of the pressure after the lower ring is pressurized, a valve is installed on the hose.

[0007] Furthermore, the upper and lower rings are combined into an open ring, the open side of which is provided with a matching plate and a fastener; and the inner cavities thereof are connected. This fixing ring is suitable for a single-person set of small-caliber cast pipes.

[0008] Furthermore, protrusions or grooves are provided on the inner circumferential surface and the outer circumferential surface of the fixing ring. The protrusions or grooves increase the friction force, which is beneficial to the sheathing and fixing of the inner and outer tubes.

[0009] Furthermore, the pressurization is to fill a pressurized fluid, including pressurized gas or pressurized liquid, such as air or water.

[0010] The beneficial effects of this utility model include: it utilizes two half-rings assembled or open-ended, with the valve facing outward, making installation and pressurization easy. Pressurized fluid is injected into the soft rubber retaining ring, which utilizes its expansion and friction to secure the inner tube, preventing it from falling. The retaining ring is recyclable, and no insect egg quarantine inspection is required for customs entry and exit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main view of Example 1 after pressurization;

[0012] Figure 2 for Figure 1 Schematic top view of

[0013] Figure 3 for Figure 1 Schematic diagram of the left side;

[0014] Figure 4 This is a schematic diagram of the main view of Example 2 after pressurization;

[0015] Figure 5 This is a schematic diagram of the main view of Example 3 after pressurization;

[0016] Figure 6 This is a schematic diagram of the assembly of the utility model;

[0017] Among them: 1-upper ring, 2-lower ring, 3-inner cavity, 4-fastener, 5-matching plate, 6-air nozzle, 7-hose, 8-valve, 9-outer tube, 10-inner tube, 11-opening ring. DETAILED DESCRIPTION

[0018] The retaining ring of this utility model consists of two symmetrical half-rings, which are distinguished as "upper ring" and "lower ring" for ease of description. The "outer end face" and "inner end face" below refer to their positions when fitted over the cast pipe. The side of the retaining ring located at the socket of the cast pipe is the "outer end face," while the side located inside the cast pipe is the "inner end face." The "outer circumferential surface" below refers to the circumferential surface where the retaining ring contacts the inner surface of the outer pipe, i.e., the outer diameter circumferential surface of the retaining ring. The "inner circumferential surface" below refers to the circumferential surface where the retaining ring contacts the outer surface of the inner pipe, i.e., the inner diameter circumferential surface of the retaining ring. Example 1

[0019] The structure of the fixed ring for the cast pipe sleeve in this embodiment is shown in the attached figure. Figure 1-3As shown. It includes an upper ring 1 and a lower ring 2, which are semi-circular cylindrical after inflation. The interior of the upper ring 1 is a hollow closed inner cavity 3, which is connected to the air nozzle 6. The air nozzle 6 can be an air nozzle for automobile tires and is fixedly installed on the outer end surface of the upper ring. A matching plate 5 is fixedly installed at the end of the semicircle of the upper ring. The structure of the lower ring 2 is consistent with that of the upper ring. After the upper and lower ring matching plates are assembled, they are fastened with fasteners 4. The fastener 4 is located in the radial direction of the fixed ring, and the width of the matching plate 5 is not greater than half of the difference between the inner diameter of the outer tube and the outer diameter of the inner tube after assembly. That is to say, the matching plate and the fastener are located between the inner and outer tubes, and do not affect the matching between the outer circumferential surface of the fixed ring and the inner surface of the outer tube, and the matching between the inner circumferential surface and the outer surface of the inner tube.

[0020] The upper and lower rings are made of elastic soft rubber. In order to achieve a firm sealing connection between the matching plate and the soft rubber, the matching plate can be made of hard rubber. Figure 6 As shown in the bell end. First, the pressurized air in the upper and lower circles is released, the outer diameter of the fixed circle becomes smaller, and the inner diameter becomes larger. The upper and lower circles are respectively inserted into the outer surface of the inner tube 10, and after the upper and lower matching plates are positioned and matched, they are fastened with fasteners. After the sockets of the inner tube are all fitted with the fixing rings of this embodiment, the inner tube is inserted into the outer tube 9. The air nozzle on the fixing ring faces outward to facilitate the inflation operation. After the inner tube is fitted and positioned in the outer tube, pressurized gas is injected into the inner cavity of the upper and lower circles from the air nozzle, causing the upper and lower circles to expand. The outer circumferential surfaces of the upper and lower circles contact the inner surface of the outer tube, and the inner circumferential surface contacts the outer surface of the inner tube. The pressurized gas in the inner cavity causes radial force to act on the inner surface of the outer tube and the outer surface of the inner tube. The friction force generated by the rubber completes the fixation of the inner tube in the outer tube. At the bell end, the elastic soft rubber can change with the shape of the bell, and the inner and outer surfaces of the bell can also be used to assist in fixing the inner tube.

[0021] To increase the friction between the fixing ring and the inner and outer pipes, small protrusions or grooves are designed on the inner and outer circumferences of the fixing ring. These small protrusions or grooves do not affect the anti-corrosion layer on the inner and outer circumferences of the cast pipe.

[0022] After the cast pipe is transported to the designated location, the air nozzle releases the pressurized gas in the air cavity. The inner pipe is no longer constrained by the fixing ring and can be taken out of the outer pipe. The fixing ring can be recycled and reused. Example 2

[0023] In Example 1, the pressurized gas injection into the upper and lower rings is performed separately, and a pressure gauge is required to adjust the pressure of the pressurized gas injection into the upper and lower ring cavities to be consistent, resulting in a low pressurized gas injection efficiency. Figure 4As shown, a high-pressure hose 7 connects the inner cavities 3 of the upper and lower rings 1 and 2, leaving a gas nozzle 6. When pressurized gas is injected through this nozzle, the inner cavities of the upper and lower rings are simultaneously filled, achieving uniform pressure. This ensures good concentricity between the inner and outer tubes and a uniform and symmetrical spacing between them. Furthermore, the hose connecting the upper and lower rings facilitates the management of retaining rings of varying specifications.

[0024] A valve 8 is preferably installed on the hose 7. This valve should be opened when injecting pressurized gas and closed when injection is complete. The gas nozzle should be placed on the upper ring. This ensures a better seal for pressurized gas in the lower ring. Even if the gas nozzle leaks, it will not affect the lower ring's support of the inner tube.

[0025] The installation of the fixing ring in this embodiment is the same as that in embodiment 1, except that the injection of pressurized gas is completed in one step, which is more convenient. Example 3

[0026] This embodiment is an improvement of the above embodiment. Figure 5 As shown, the upper ring 1 and the lower ring 2 of the embodiment are combined into an open ring 11, the opening position retains the matching plate 5 and the fastener 4, the hose and the valve in the embodiment 2 are removed, and the inner cavity 3 in the upper and lower rings are directly connected. In this way, when pressurized gas is injected from the gas nozzle 6, the expansion pressure of the open ring 11 outward or inward is consistent, the inner and outer tubes have good concentricity, and the space between them is uniform.

[0027] During assembly, this embodiment simply extends the fasteners from the open end of the mating plate across the outer diameter of the pipe. Compared to the previous two embodiments, this is suitable for assembly of small-diameter pipes, such as DN100-DN400, and can be completed by one person. The previous two embodiments are suitable for assembly of larger-diameter pipes, such as DN600 and above, and require two people to complete the assembly.

[0028] The above description is based on the injection of pressurized gas, but pressurized liquid, such as high-pressure water, may be used instead of pressurized gas.

[0029] The utility model adopts two half rings or a fixing ring with one side open, which makes it easy to fit the fixing ring onto the inner tube. The air nozzle is on the outer end facing outward, which facilitates the pressure charging operation. After the inner tube is fitted into the outer tube and positioned, pressurized fluid is injected, and the inner tube is fixed by the expansion and friction of the soft rubber fixing ring, thereby achieving the fitting and fixing of the inner tube. As long as the air nozzle does not leak and the pressure of the fixing ring is stable, the inner tube will not fall out of the outer tube. After the fixing ring is depressurized, the inner tube is removed and the fixing ring can be recycled and reused. With the rubber fixing ring of the utility model, no quarantine inspection for insect eggs is required when entering and leaving customs.

Claims

1. A fixing ring for a cast pipe sleeve, installed between the inner and outer cast pipes of the sleeve, characterized by: The invention comprises an upper ring (1) and a lower ring (2) which are semi-circular cylindrical after being pressurized, wherein the interior of the upper ring (1) is a hollow and closed inner cavity (3), the inner cavity (3) is communicated with a gas nozzle (6), the gas nozzle (6) is fixedly mounted on the outer end surface, and a matching plate (5) is mounted on the semi-circular end of the upper ring (1); the structure of the lower ring (2) is consistent with that of the upper ring (1); the matching plate (5) is fastened with a fastener (4) after being assembled; the fastener (4) is located in the radial direction of the fixed ring, and the matching plate (5) and the fastener (4) are located between the inner and outer cast pipes.

2. The fixing ring for cast pipe sleeve according to claim 1, characterized in that: The inner cavity (3) of the upper ring (1) and the inner cavity (3) of the lower ring (2) are connected by a hose (7).

3. The fixing ring for cast pipe sleeve according to claim 2, characterized in that: A valve (8) is installed on the hose (7).

4. The fixing ring for cast pipe sleeve according to claim 1, characterized in that: The upper ring (1) and the lower ring (2) are combined into an open ring (11), and a matching plate (5) and a fastener (4) are provided on the open side of the open ring (11); the inner cavity (3) is connected.

5. A fixing ring for cast pipe sleeve according to claim 1 or 4, characterized in that: Protrusions or grooves are provided on the inner circumferential surface and the outer circumferential surface of the fixing ring.

6. The fixing ring for cast pipe sleeve according to claim 1, characterized in that: The pressurization is to fill with pressurized fluid, including pressurized gas or pressurized liquid.

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