Anti-slip socket plug for cast pipe cement lining

Abstract

The utility model discloses an anti-slip socket plug for cement lining of a cast pipe, which belongs to the technical field of cement lining of nodular cast iron pipes and comprises a shell, a hollow rubber tire arranged in the shell and an inflating nozzle arranged on one side of the rubber tire and communicated with the inside of the rubber tire. The inner surface of the rubber tire is a friction surface; the shell is a cylinder and comprises a top surface, a cylindrical surface and a bottom surface; the top surface is annular, and the annular inner diameter is larger than the outer diameter of the cast pipe socket; a circular boss is inwards arranged on the bottom surface; the section of the rubber tire is L-shaped, and the rubber tire comprises a long arm and a short arm; the long arm is parallel to the cylindrical surface and points to the bottom surface from the top surface of the shell, and the short arm is parallel to the bottom surface and points to the side wall of the boss from the cylindrical surface of the shell; and the friction surface is arranged on the inner side of the long arm of the rubber tire, is concave-convex and is provided with reverse inclination. The nodular cast iron pipe plug can effectively prevent the nodular cast iron pipe from accidentally slipping when the nodular cast iron pipe rotates at a high speed.

Description

Technical Field

[0001] This utility model relates to the field of cement lining technology for ductile iron pipes, and in particular to an anti-slip plug for cement lining of cast iron pipes. Background Technology

[0002] In the production of ductile iron pipes, during the centrifugal cement coating process in the downstream line, compressed air is filled into the rubber core of the plug at the spigot end. The outer circumference of the core is constrained by the shell and does not expand outwards, while the inner circumference expands inwards to press firmly against the outer circumference of the spigot. The end face of the core expands and presses firmly against the end face of the spigot. The cement, under the resistance of the core's end face, is centrifugally rotated and evenly distributed to coat the inner wall of the pipe. The inner arc surface of the commonly used core is smooth. If there is a slight air leak in the core, or the inflation pressure is insufficient, the pressure between the inner circumference of the core and the outer circumference of the spigot will decrease, and the friction between the core and the spigot will also decrease. During high-speed rotation, the plug may slip outwards, causing the cement coating to protrude from the spigot end face, requiring manual secondary cleaning and increasing labor. If the slippage is severe, the plug may be thrown off, posing a safety hazard. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an anti-slip plug for cement lining of ductile iron pipes, which can effectively prevent the plug from accidentally slipping off when the ductile iron pipe is rotated at high speed.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A non-slip plug for cement lining of cast iron pipe includes a shell, a hollow rubber core disposed inside the shell, and an air inlet disposed on one side of the rubber core and communicating with the interior of the rubber core; the inner surface of the rubber core is provided with a friction surface.

[0006] A further improvement of the present invention is that the shell is a cylinder, including a top surface, a cylindrical surface and a bottom surface; the top surface is annular, and the inner diameter of the annulus is larger than the outer diameter of the casting pipe socket; a circular boss is provided inward on the bottom surface, and the outer diameter of the boss is smaller than the inner diameter of the casting pipe socket.

[0007] A further improvement of the present invention is that the cross-section of the rubber tire is L-shaped, including a long arm and a short arm; the long arm is parallel to the cylindrical surface and points from the top surface of the shell to the bottom surface, and the short arm is parallel to the bottom surface and points from the cylindrical surface of the shell to the side wall of the boss.

[0008] A further improvement of this utility model is that the friction surface is located on the inner side of the rubber tire arm, is concave-convex, and has a reverse slope.

[0009] A further improvement of this utility model is that the hollow shape of the rubber tire corresponds to that of the rubber tire.

[0010] A further improvement of this utility model is that: the inflation nozzle passes through the bottom surface of the shell and communicates with the hollow part of the rubber tire; the inflation nozzle and the rubber tire are integrally formed.

[0011] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0012] 1. This utility model can be applied to cement lining operations of ductile iron pipes, and can prevent the plug from accidentally slipping off. Furthermore, this utility model uses rubber material, thus not increasing manufacturing costs.

[0013] 2. In this utility model, the concave and convex shape and reverse slope of the inner circle of the rubber tire increase the surface area of ​​the inner circle, which increases the friction coefficient between the rubber tire and the insertion. The reverse slope design increases the outward friction resistance and strengthens the anti-slip function. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-section of the anti-slip plug for cement lining of cast iron pipe in this utility model;

[0015] The components are: 1. shell, 2. rubber tire, 3. air inlet, 4. cast pipe inlet, and 5. cement lining. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1 As shown, an anti-slip plug for cement lining of cast pipe includes a shell 1, a hollow rubber core 2 disposed inside the shell 1, and an air inlet 3 disposed on one side of the rubber core 2 and communicating with the inside of the rubber core 2.

[0019] The shell 1 is a cylinder, including a top surface, a cylindrical surface and a bottom surface; the top surface is annular, and the inner diameter of the annulus is larger than the outer diameter of the cast pipe socket 4; a circular boss is provided inward on the bottom surface, and the outer diameter of the boss is smaller than the inner diameter of the cast pipe socket 4.

[0020] The cross-section of the rubber tire 2 is L-shaped, with the long arm parallel to the cylindrical surface, pointing from the top surface of the shell 1 to the bottom surface, and the short arm parallel to the bottom surface, pointing from the cylindrical surface of the shell 1 to the side wall of the boss; the inner surface of the long arm of the rubber tire 2 is concave and convex, and is provided with a reverse slope; the rubber tire 2 is made of hollow soft rubber material; the hollow shape of the rubber tire 2 corresponds to the rubber tire 2.

[0021] The inflation nozzle 3 passes through the bottom surface of the shell 1 and communicates with the hollow part of the rubber tire 2; the inflation nozzle 3 and the rubber tire 2 are integrally formed.

[0022] How to use:

[0023] The rubber tire 2 is assembled inside the housing to form a complete plug, and there is a gap between it and the housing when it is not inflated. After air is introduced through the inflation nozzle 3, the concave and convex surfaces and end faces of the inner side of the rubber tire 2 expand and fit tightly against the outer circle and end face of the cast pipe inlet 4. The concave and convex shape and reverse slope of the inner circle of the rubber tire 2 increase the surface area of ​​the inner circle, which increases the coefficient of friction between the rubber tire and the inlet. The reverse slope design increases the outward frictional resistance and strengthens the anti-slip effect. This effect is not limited to one shape.

[0024] Rotating the ductile iron pipe, the cement mortar is sealed inside the plug and evenly distributed and coated on the inner wall of the pipe under the action of centrifugal force, forming a cement lining 5.

Claims

1. A non-slip plug for cement-lined cast iron pipes, characterized in that: It includes a housing (1), a hollow rubber tire (2) disposed inside the housing (1), and an air inlet (3) disposed on one side of the rubber tire (2) and communicating with the interior of the rubber tire (2); the inner surface of the rubber tire (2) is provided with a friction surface; The cross-section of the rubber tire (2) is L-shaped, including a long arm and a short arm; the long arm is parallel to the cylindrical surface and points from the top surface of the shell (1) to the bottom surface, and the short arm is parallel to the bottom surface and points from the cylindrical surface of the shell (1) to the side wall of the boss; the friction surface is set on the inner side of the long arm of the rubber tire (2), is concave and convex, and is provided with a reverse slope.

2. The anti-slip plug for cement-lined cast iron pipes according to claim 1, characterized in that: The shell (1) is a cylinder, including a top surface, a cylindrical surface and a bottom surface; the top surface is annular, and the inner diameter of the annular surface is larger than the outer diameter of the cast pipe socket (4); a circular boss is provided inward on the bottom surface, and the outer diameter of the boss is smaller than the inner diameter of the cast pipe socket (4).

3. The anti-slip plug for cement-lined cast iron pipes according to claim 1, characterized in that: The hollow shape of the rubber tire (2) corresponds to the shape of the rubber tire (2).

4. The anti-slip plug for cement-lined cast iron pipes according to claim 1, characterized in that: The inflation nozzle (3) passes through the bottom surface of the shell (1) and communicates with the hollow part of the rubber tire (2); the inflation nozzle (3) and the rubber tire (2) are integrally formed.

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