A rubber flexible joint and a forming process

Abstract

The application discloses a rubber flexible joint pipe and a forming process, relates to the technical field of rubber flexible joint pipe forming processes, and is characterized in that a geodesic line stress structure is adopted in a core mold corrugated section, and a constant-interval geodesic line winding forming process is adopted in rubber flexible joint pipe winding on the geodesic line stress core mold in an alternating manner with rubber belts and cords. The forming process is as follows: a winding device is used to uniformly spread a plurality of cords and rubber belts on the surface of the geodesic line stress core mold at specific geodesic line intervals. The process can realize automatic processing of the same winding equipment, has an excellent processing environment, is low in labor intensity, and is high in production efficiency; and the product is high in reliability, resistant to corrosion, and high in large displacement compensation capacity, and can realize excellent shock absorption effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rubber flexible pipe, and particularly relates to a rubber flexible pipe and a forming process. BACKGROUND

[0002] As an important accessory of pipeline system, the rubber flexible pipe can absorb displacement caused by impact vibration, pressure and temperature change of the pipeline system and equipment, prevent excessive stress in the pipeline system caused by deformation, and thus ensure the safety of the pipeline system. With the increasing strength of modern new equipment vibration source, higher performance requirements are put forward for the rubber flexible pipe. However, the current rubber flexible pipe forming technology mainly adopts a multi-layer rubber structure and is formed by manually laying multiple layers of cord fabric and then vulcanizing, which has high labor intensity, low production efficiency, poor quality of formed products, poor consistency of products, and low reliability. SUMMARY

[0003] The present application aims to solve the problems of low production efficiency, poor quality consistency, low compression resistance, short service life and poor processing environment of the existing rubber flexible pipe forming process, and provides a rubber flexible pipe and a forming process. The process effectively combines two kinds of materials, i.e. flexible rubber and cord, and two kinds of winding processes, fully utilizes the respective characteristics of the materials and winding processes, and realizes automatic processing of one winding equipment by replacing different specifications of guide wire heads. The product has good flexibility, light weight, low cost, long service life, stable reinforcing structure and excellent processing environment, and can realize higher compression resistance among products of the same specification.

[0004] A rubber flexible pipe and a forming process, characterized in that the isostress rubber flexible pipe is formed by the constant pitch geodesic line winding forming process in which the rubber belt 6 and the cord 5 are alternately wound on the geodesic line isostress mandrel 1.

[0005] The geodesic line isostress mandrel 1 is composed of a corrugated section 2, a cylindrical section 3 and a connecting rod 4. The two ends of the corrugated section 2 are connected with the cylindrical section 3, and the two ends of the cylindrical section 3 are connected with the connecting rod 4. The connecting rod can be clamped by a chuck, and the chuck rotates to drive the mandrel to rotate for winding and forming the rubber flexible pipe. The corrugated section 2 is a geodesic line isostress structure, and the geodesic line isostress structure of the corrugated section is created according to the meridian profile line, and the expression of the meridian profile line is as follows:

[0006]

[0007]

[0008] In the formula, Y min is the minimum radius of the corrugated section, Y eq is the maximum radius of the corrugated section, r is a corrugated segment axial length influence factor, ellF is an incomplete elliptic integral of the first kind, ellE is an incomplete elliptic integral of the second kind, and theta is an independent parameter; the meridian profile of the corrugated segment 2 is determined by designing parameters r and q, and the Y is taken as the horizontal coordinate and the Z is taken as the vertical coordinate to obtain the corrugated segment 2 by rotating around the Z axis; p0 is the radius of the cylindrical segment 3, and l is the length of the cylindrical segment 3, and the cylindrical segment 3 is obtained by designing parameters p0 and l.

[0009] The constant-interval geodesic winding forming process is characterized by applying a winding device to uniformly spread a plurality of cords and rubber belts on the surface of a geodesic stress core mold at a specific geodesic interval.

[0010]

[0011] In the formula, A is the rotation angle of the guide head, is the slope angle of the meridian profile of the core mold, n is the number of cutting points, m is the number of cords, b is the interval of the yarn holes, alpha is the winding angle, d is the interval width of the cords, and W is the width of the rubber belt.

[0012] The number of layers of the rubber belt and the cord winding can be set according to the specifications of the rubber flexible pipe, and automatic processing of one winding device can be realized by replacing guide heads of different specifications.

[0013] The rubber belt and the cord are alternately wound on the geodesic stress core mold by the constant-interval geodesic winding forming process, which improves the compression resistance of the rubber flexible pipe of the same specification. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the core mold structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure after winding according to the present invention;

[0017] Figure 3 This is a schematic diagram of the winding process of the present invention;

[0018] Figure 4 This is a schematic diagram of the fault structure of the present invention;

[0019] Figure 5 This is a schematic diagram of the meridional contour of the core mold of the present invention.

[0020] In the diagram: 1. Core mold, 2. Corrugated section, 3. Cylindrical section, 4. Connecting rod, 5. Cord, 6. Rubber belt. Detailed Implementation

[0021] The following is in conjunction with the appendix Figures 1-5 The present invention will be further described with reference to specific embodiments:

[0022] As shown in the figure, a flexible rubber connector and its molding process are characterized in that the flexible rubber connector is formed by a constant-spacing geodesic winding molding process in which rubber strips 7 and cords 6 are alternately wound on a geodesic geodesic mandrel 1.

[0023] like Figure 1 As shown, the geodesic isostress mandrel 1 consists of a corrugated section 2, a cylindrical section 3, and a connecting rod 4. Both ends of the corrugated section 2 are connected to the cylindrical section 3, and both ends of the cylindrical section 3 are connected to the connecting rod 4. The connecting rod can be held in place by a chuck. The rotation of the chuck drives the mandrel to rotate, and it is formed by winding a flexible rubber conduit. The corrugated section 2 is the geodesic isostress structure. The corrugated section geodesic isostress structure is created based on the meridian outline, referring to... Figure 5 The expression for the meridian outline is as follows:

[0024]

[0025]

[0026] In the formula, Y min Y is the minimum radius of the corrugated segment. eq The maximum radius of the corrugated section. r is a corrugated segment axial length influence factor, ellF is an incomplete elliptic integral of the first kind, ellE is an incomplete elliptic integral of the second kind, and θ is an independent parameter. The meridian profile of the corrugated segment 2 is determined by designing the parameters r and q, and the corrugated segment 2 is obtained by rotating the meridian profile around the Z axis with Y as the horizontal coordinate and Z as the vertical coordinate. ρ0 is the radius of the cylindrical segment 3, and l is the length of the cylindrical segment 3. The cylindrical segment 3 is obtained by designing the parameters ρ0 and l.

[0027] As shown in Figure 2 , 3 , the constant-interval geodesic winding forming process is characterized in that a plurality of cords and rubber belts are uniformly laid on the surface of the geodesic stress core mold 1 at specific geodesic intervals by using a winding device. The constant-interval geodesic winding process is expressed as follows:

[0028]

[0029] In the formula, A is the rotation angle of the guide head, is the slope angle of the meridian profile of the core mold, n is the number of tangent points, m is the number of cords, b is the interval of the yarn holes, α is the winding angle, d is the interval width of the cords, and W is the width of the rubber belt.

[0030] Example: As shown in the figure, taking the design of a DN50 rubber flexible pipe as an example, the corrugated segment parameters are designed as Y min = 25 mm, Y eq = 37 mm, and r = 0.47. The corrugated segment is obtained by rotating the meridian profile around the Z axis with Y as the horizontal coordinate and Z as the vertical coordinate. The cylindrical segment parameters are designed as ρ0 = 25 mm and l = 50 mm. The corrugated segment is connected to the cylindrical segment at both ends, and the cylindrical segment is connected to the connecting rod at both ends to obtain the geodesic stress core mold.

[0031] The constant-interval geodesic winding forming process is adopted. The value of Y is determined by the value of θ, and 0 ≤ θ ≤ π / 2. The winding angle α is determined according to the value of Y (for example, α = 69° (Y = 25 mm) and α = 75° (Y = 37 mm)). The number of tangent points (for example, n = 3), the number of cords (for example, m = 5), the interval of the yarn holes (for example, b = 4 mm), and the width of the rubber belt (for example, W = 20 mm) are determined. The plurality of cords and rubber belts are uniformly laid on the surface of the geodesic stress core mold at specific geodesic intervals by using a winding device.

[0032] The corrugated segment and the cylindrical segment of the core mold adopt the geodesic stress structure, realizing the overall geodesic winding of the rubber belt and the cord. The constant-interval geodesic winding forming process is adopted, in which the rubber belt and the cord are alternately wound on the geodesic stress core mold, improving the compression resistance of the rubber flexible pipe of the same specification. The connecting rod is clamped by the chuck, facilitating the grabbing of the core mold and the winding of the rubber belt and the cord. When used, the rubber flexible pipe can effectively absorb the impact in the pipeline system.

Claims

1. A process for forming a rubber flexible joint, characterized in that The equal stress rubber flexible joint pipe is formed by the constant interval geodesic line winding process of the rubber belt (6) and the cord (5) alternately winding on the geodesic line equal stress core mold (1); The geodesic line equal stress core mold (1) is composed of a corrugated section (2), a cylindrical section (3) and a connecting rod (4), the two ends of the corrugated section (2) are connected with the cylindrical section (3) and the connecting rod (4) at the same time, the corrugated section (2) is a geodesic line equal stress structure, and the geodesic line equal stress structure of the corrugated section is created according to a meridian profile line, wherein the meridian profile line expression is as follows: wherein is the minimum radius of the corrugated segment, is the maximum radius of the corrugated segment, is the axial length influence factor of the corrugated segment; ellF is the first kind of incomplete elliptic integral, and ellE is the second kind of incomplete elliptic integral, is an independent parameter, the meridian profile of the corrugated segment (2) is determined by designing the parameters r, q, and the corrugated segment (2) is obtained by rotating the stack around the Z axis with Y as the horizontal coordinate and Z as the vertical coordinate; is the radius of the cylindrical segment (3), and l is the length of the cylindrical segment (3), and the cylindrical segment (3) is obtained by designing the parameters , l.

2. A process for forming a rubber flexible pipe according to claim 1, characterized in that The winding device is applied to uniformly spread a plurality of cords and rubber belts on the surface of the geodesic line equal stress core mold (1) at specific geodesic line equal intervals; and the constant interval geodesic line winding process expression is as follows: In the formula, A is the wire head rotation angle, is the core mold meridian profile slope angle, n is the number of tangent points, m is the number of cords, b is the spacing between yarn outlets, is the winding angle, d is the cord spacing width, and W is the rubber belt width.

Images