Anti-drawing joint of composite rubber pipe

Abstract

The utility model belongs to the technical field of pipe joints, and particularly relates to an anti-drawing joint of a composite rubber pipe. The anti-drawing connector comprises a core pipe inserted into a pipe opening and a sleeve locked with the core pipe, a liner pipe is arranged between the core pipe and the sleeve, the inner surface of the liner pipe and the outer surface of the core pipe form an inner hoop mechanism for meshing an inner rubber layer and a reinforcing layer of a composite rubber pipe, and the outer surface of the liner pipe and the inner surface of the sleeve form an outer hoop mechanism for meshing the reinforcing layer of the composite rubber pipe. The rear end of the liner tube is provided with a flange for supporting the composite rubber tube reinforcing layer to be turned outwards; the inner hoop mechanism and the outer hoop mechanism are of concave-convex clamping structures which are annularly matched with each other; the anti-drawing connector is tightly connected with the composite rubber pipe, the connector part can bear large axial impact, and the anti-drawing connector has the advantages of being compact in structure, firm in locking, safe and stable.

Description

Technical Field

[0001] This utility model belongs to the field of pipe fitting technology, specifically relating to a pull-out resistant joint for composite rubber hoses. Background Technology

[0002] Composite hoses, widely used in oil transportation, hydraulic machinery, and other fields, generally consist of an outer rubber tube, an intermediate steel wire reinforcing tube, and an inner conveying tube. The hose fitting structure is formed by pressing and locking a core tube inserted into the inner tube and a clamp sleeve fitted around the reinforcing tube and the outer tube. The clamp sleeve is tightened by the radial contraction force of the crimping machine, causing deformation of the clamp sleeve and the core tube to secure the hose fitting.

[0003] Most composite hoses currently use the above-mentioned crimping connection method. However, simply crimping the hose radially lacks axial restraint and results in poor pull-out resistance. Furthermore, the interlocking positioning method is simplistic. The interlocking structure not only compresses the rubber layer to achieve a seal but also locks the reinforcing layer to ensure a reliable connection. Especially for high-pressure pipelines with thick walls, the interlocking structure cannot achieve sufficient axial strength, and pulling during pipeline use can easily cause problems such as loosening and detachment of the joint. Utility Model Content

[0004] The purpose of this invention is to provide a pull-out resistant joint that connects tightly to composite hoses and can withstand large axial impacts at the joint. It features a compact structure, reliable locking, and safety and stability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A pull-out resistant joint for a composite hose, characterized in that: it includes a core tube inserted into the hose opening and a sleeve that locks with it; a liner is provided between the core tube and the sleeve; the inner surface of the liner and the outer surface of the core tube form an inner clamping mechanism that engages the inner rubber layer and the reinforcing layer of the composite hose; the outer surface of the liner and the inner surface of the sleeve form an outer clamping mechanism that engages the reinforcing layer of the composite hose; the rear end of the liner has a flange that supports the outward folding of the reinforcing layer of the composite hose; and the inner clamping mechanism and the outer clamping mechanism are circumferentially interlocking concave-convex interlocking structures.

[0007] The additional technical features constituting the pull-out joint of the aforementioned composite hose also include:

[0008] —The interlocking structure includes threads, serrations, barbs, or trapezoidal or rectangular grooves;

[0009] —The interlocking structure further includes a plurality of bundle rings arranged between the liner and the sleeve;

[0010] —The flange and the hoop are used to press the folded part of the reinforcing layer, and the front end of the sleeve is engaged and fixed with the hoop or threaded.

[0011] —The inner clamping mechanism includes a first engagement portion located at the tapered front section of the core tube, used to seal and clamp the reinforcing layer and at least a portion of the inner rubber layer; the inner clamping mechanism also includes a second engagement portion located at the rear section of the core tube, used to clamp the reinforcing layer, wherein the interlocking density of the first engagement portion is greater than that of the second engagement portion, and the interlocking depth of the second engagement portion is greater than that of the first engagement portion;

[0012] —The front end and / or rear end of the sleeve are provided with an extension section, and the inner surface of the extension section is provided with a circumferential ridge or circumferential groove for locking and shaping the sleeve.

[0013] Compared with the prior art, the anti-pull-out joint of the composite hose provided by this utility model has the following advantages: the liner of the anti-pull-out joint has a double-layer interlocking clamp, and through the concave-convex interlocking structure formed with the core tube and the sleeve respectively, the reinforcing layer of the composite hose is folded over and locked a second time, which improves the axial tensile force of the joint, ensures that the joint connection is tight and reliable, and resists pull-out impact. It has the advantages of compact structure, reliable locking, safety and stability. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a pull-out resistant joint for a composite hose according to this utility model. Detailed Implementation

[0015] The structure and working principle of the novel composite hose pull-out joint provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] In the description of this utility model, unless otherwise stated, the terms "inner / outer", "front / rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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.

[0017] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1 As shown, the structure of the pull-out joint of the new composite hose includes a core tube 1 inserted into the tube opening and a sleeve 2 that is locked to it. A liner 3 is provided between the core tube 1 and the sleeve 2. The inner surface of the liner 3 and the outer surface of the core tube 1 form an inner clamping mechanism 41 that interlocks the inner rubber layer a and the reinforcing layer b of the composite hose. The outer surface of the liner 3 and the inner surface of the sleeve 2 form an outer clamping mechanism 42 that interlocks the reinforcing layer b of the composite hose. The rear end of the liner 3 has a flange 51 that supports the outward folding of the reinforcing layer b of the composite hose. The inner clamping mechanism 41 and the outer clamping mechanism 42 are circumferentially interlocking concave-convex interlocking structures.

[0019] Its working principle is as follows: First, the connecting port of the composite hose is peeled off in layers, the outer rubber layer c is removed, and part of the inner rubber layer a is retained. The front part of the core tube 1 is inserted into the inner rubber layer a of the composite hose, and the outer liner 3 is fitted for positioning. That is, the inner surface of the liner 3 and the outer surface of the core tube 1 form an interlocking mechanism 41 for the inner rubber layer a and the reinforcing layer b of the composite hose. The peeled reinforcing layer b is turned outward at the flange 51 at the rear end of the liner 3 and attached to the outer surface of the liner 3 again. Then, the outer sleeve 2 is installed for positioning. That is, the outer surface of the liner 3 and the inner surface of the sleeve 2 form an interlocking mechanism 42 for the reinforcing layer b of the composite hose. Finally, the whole is locked and shaped by the locking and crimping equipment.

[0020] The aforementioned inner clamping mechanism 41 and outer clamping mechanism 42 are both circumferentially interlocking structures, that is, the inner and outer surfaces of the liner 3 respectively interlock with the core tube 1 and the sleeve 2 to double-clamp the hose reinforcement layer b. In particular, after the reinforcement layer b is folded outward at the rear end of the liner 3, the locking ability of the hose opening is better and the axial pull-out resistance is stronger.

[0021] In the pull-out resistant joint structure constituting the above-mentioned novel composite hose

[0022] —The interlocking structure of the inner and outer surfaces of the liner 3 can take many forms. For example, threads can be set on the inner and outer surfaces of the liner 3. After they are engaged with the threads on the outer surface of the core tube 1 and the inner surface of the sleeve 2, they can be tightened and positioned. At the same time, the reinforcing layer b can also be locked. The threads can also be replaced by serrations, barbs, trapezoidal or rectangular grooves as equivalent replacements.

[0023] —In order to better achieve clamping and shaping, spikes can be evenly distributed inside the above-mentioned concave-convex interlocking structure, that is, on the inner and outer surfaces of the liner 3, or several bundle rings can be arranged between the liner 3 and the sleeve 2 to strengthen the clamping effect on the reinforcing layer b.

[0024] — Preferably, the flange 51 at the rear end of the liner 3 is provided with a clamping ring 53 to press the folded part of the composite hose reinforcement layer b. The clamping ring 53 can ensure that the reinforcement layer b is neatly folded outward. At the same time, the clamping ring 53 and the flange of the liner 3 are pressed together to strengthen the locking effect and make it difficult to loosen or pull out. The front end of the sleeve 2 is engaged and fixed with the clamping ring 53 or threaded, so that the clamping ring 53 and the sleeve 2 are shaped into a whole, with a tighter fit. It has the advantages of compact structure and high connection strength.

[0025] —As a preferred embodiment, the inner clamping mechanism 41 includes a first engagement portion 61 located at the tapered front section of the core tube 1 for sealing and clamping the reinforcing layer b and at least a portion of the inner rubber layer a; the inner clamping mechanism 41 also includes a second engagement portion 62 located at the rear section of the core tube 1 for clamping the reinforcing layer b. That is, in response to the delamination of the composite hose connector opening, the inner clamping mechanism 41 adopts a segmented locking form, with the first engagement portion 61 focusing on sealing and the second engagement portion 62 focusing on clamping strength.

[0026] Furthermore, the interlocking density of the first interlocking part 61 is greater than that of the second interlocking part 62, which can achieve a higher sealing effect and improve the safety and stability of the pipe joint; the interlocking depth of the second interlocking part 62 is greater than that of the first interlocking part 61, which can achieve better interlocking force and pull-out resistance.

[0027] — Preferably, the front end and / or rear end of the sleeve 2 are respectively provided with an extension section 7. The inner surface of the extension section 7 is provided with a circumferential ridge or circumferential groove 71 for locking and shaping the tube. When the joint is crimped and locked, the circumferential ridge or circumferential groove 71 can send radial shrinkage deformation, which can lock the composite tube more firmly. As an equivalent alternative, the shape of the circumferential ridge or circumferential groove 71 can be a straight strip parallel to the axial direction, or a circle or spiral distributed along the axial direction.

[0028] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A pull-out resistant joint for composite hoses, characterized in that: The device includes a core tube inserted into the tube opening and a sleeve that locks with it. A liner is provided between the core tube and the sleeve. The inner surface of the liner and the outer surface of the core tube form an inner clamping mechanism that engages the inner rubber layer and the reinforcing layer of the composite hose. The outer surface of the liner and the inner surface of the sleeve form an outer clamping mechanism that engages the reinforcing layer of the composite hose. The rear end of the liner has a flange that supports the outward folding of the reinforcing layer of the composite hose. The inner clamping mechanism and the outer clamping mechanism are circumferentially interlocking concave-convex structures.

2. The tensile-resistant joint of a composite hose according to claim 1, characterized in that: The interlocking structure includes threads, serrations, barbs, or trapezoidal or rectangular grooves.

3. A tensile-resistant joint for a composite hose according to claim 1 or 2, characterized in that: The interlocking structure also includes a plurality of bundle rings arranged between the liner and the sleeve.

4. A tensile-resistant joint for a composite hose according to claim 1 or 2, characterized in that: The flange engages with the hoop to press the folded portion of the reinforcing layer, and the front end of the sleeve is engaged or threaded with the hoop.

5. The tensile-resistant joint of a composite hose according to claim 1, characterized in that: The inner clamping mechanism includes a first engagement portion located at the tapered front section of the core tube, used to seal and clamp the reinforcing layer and at least a portion of the inner rubber layer; the inner clamping mechanism also includes a second engagement portion located at the rear section of the core tube, used to clamp the reinforcing layer, wherein the interlocking density of the first engagement portion is greater than that of the second engagement portion, and the interlocking depth of the second engagement portion is greater than that of the first engagement portion.

6. The tensile-resistant joint of a composite hose according to claim 1, characterized in that: The sleeve has an extension section at its front end and / or rear end, and the inner surface of the extension section is provided with a circumferential ridge or circumferential groove for locking and shaping the sleeve.

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