Kink-resistant polyurethane hose connection structure

Abstract

The utility model discloses a kind of anti-bending polyurethane hose connecting structures, to solve the poor anti-bending performance of existing polyurethane hose connecting structure, easy to leak, the problem of unstable connection. It includes polyurethane hose, pipe joint assembly and anti-bending clamp;Pipe joint assembly contains pipe joint body and connecting nut, pipe joint body one end is connected with hose (preferably trapezoidal thread), the other end is connected with external pipeline through nut, nut inner wall is equipped with annular sealing groove and sealing ring;Anti-bending clamp is composed of symmetrical clamp block and fastening bolt, clamp block inboard arc surface is attached to hose outer wall, arc surface is equipped with anti-skid texture, and it is clamped in the combination area of hose and pipe joint body by bolt. The structure can limit hose bending radius, disperse bending stress, improve the bending resistance, double sealing prevents leakage, connection is stable, suitable for hydraulic, pneumatic, granular material conveying and other industrial scenes.

Description

Technical Field

[0001] This utility model relates to the field of industrial fluid transmission and connection technology, specifically to a flexural polyurethane hose connection structure. Background Technology

[0002] In industrial production and machinery operation, polyurethane hoses are widely used for the transmission of media (such as liquids, gases, and particulate materials) due to their excellent flexibility, corrosion resistance, and pressure resistance. The connection structure of the polyurethane hose, as the core component connecting the hose to external pipelines and equipment, directly affects the sealing performance of the media transmission, the stability of the connection, and the service life of the hose.

[0003] Existing polyurethane hose connection structures typically consist of a polyurethane hose, a fitting body, and a connecting nut. One end of the fitting body connects to the end of the polyurethane hose, usually via an interference fit or a simple threaded connection. The other end of the fitting body has an external thread that mates with the internal thread of the connecting nut to connect to an external pipeline. However, this type of structure has significant shortcomings: First, the joint area between the hose and the fitting body lacks a dedicated anti-bending restraint component, making the hose prone to excessive bending (too small a bending radius) during use, leading to stress concentration and rupture of the hose wall due to tension or compression. Second, the connecting nut relies solely on the thread itself for sealing, which can easily lead to media leakage during long-term use or exposure to vibration. Third, the connection between the fitting body and the hose lacks stability; interference fits are prone to loosening due to repeated bending, and simple threaded connections lack anti-loosening designs. Fourth, some structures with clamping components often have asymmetrical clamp designs or poor adaptation between the clamping blocks and the hose's outer diameter, failing to effectively distribute bending stress and lacking anti-slip measures, resulting in poor clamping performance and causing fatigue damage to the hose at the connection point, shortening its service life. Utility Model Content

[0004] This utility model aims to solve the technical problems of existing polyurethane hose connection structures, such as poor bending resistance (the area where the hose and pipe joint are joined is prone to excessive bending), weak sealing performance (prone to media leakage), insufficient connection stability (the pipe joint and hose are prone to loosening), and poor clamping effect (poor compatibility of clamping components and lack of anti-slip design).

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model provides a flexurally resistant polyurethane hose connection structure, including a polyurethane hose, a hose connector assembly, and a flexurally resistant clamp; the polyurethane hose is a hollow tubular structure with a smooth inner wall to ensure smooth medium transmission; the hose connector assembly includes a hose connector body and a connecting nut, one end of the hose connector body is connected to the end of the polyurethane hose, and this end of the hose connector body is provided with an external thread, while the inner wall of the end of the polyurethane hose is provided with an internal thread adapted to the external thread, and the two are connected by threaded engagement. Preferably, the external thread of the hose connector body is a trapezoidal thread to improve connection stability and anti-detachment effect; the other end of the hose connector body is provided with an external thread, and the connecting nut is provided with an internal thread adapted to the external thread. The connecting nut has an internal thread that engages with the external thread of the pipe fitting body, and the inner wall of the connecting nut has an annular sealing groove with a sealing ring inside to enhance the sealing of the connection and prevent media leakage. The anti-bending clamp includes two symmetrically arranged clamping blocks and at least one fastening bolt, preferably two fastening bolts, which are respectively located at both ends of the clamping blocks to improve clamping balance. The inner sides of the two clamping blocks have arc surfaces adapted to the outer diameter of the polyurethane hose, and the arc surfaces have anti-slip textures to prevent the clamping blocks from sliding relative to the hose and enhance clamping reliability. The two clamping blocks are clamped to the joint area between the polyurethane hose and the pipe fitting body by the fastening bolts to limit the degree of bending of the polyurethane hose in this area, prevent excessive bending, and distribute bending stress.

[0006] One or more technical solutions provided in this application have at least the following technical effects or advantages compared with the prior art: Significantly improved bending resistance: The symmetrical clamping blocks of the bending clamp clamp the joint area through the arc surface adapted to the outer diameter of the hose, which can not only limit the minimum bending radius of the hose and prevent excessive bending, but also disperse bending stress, avoid the pipe wall from cracking due to stress concentration, and extend the service life of the hose. Stable sealing performance: The annular sealing groove on the inner wall of the connecting nut cooperates with the sealing ring, which greatly improves the sealing effect compared with the existing threaded sealing method and effectively prevents media leakage. Strong connection stability: The pipe fitting body and the hose are connected by trapezoidal thread engagement, and the anti-slip texture of the anti-bending clamp and double bolt clamping prevent the connection from loosening or slipping, and are suitable for vibration conditions; High practicality: Each component has a simple structure and is easy to assemble. The symmetrical design of the clamping blocks and the double bolt layout ensure balanced clamping. It is compatible with polyurethane hoses of different specifications and has a wide range of applications.

[0007] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0008] Figure 1 This is an assembly diagram of an anti-bending polyurethane hose connection structure according to the present invention; Figure 2 This is an exploded view of an anti-bending polyurethane hose connection structure according to this utility model; Figure 3 This is a cross-sectional view of a flexural polyurethane hose connection structure according to the present invention.

[0009] As shown in the figure: 1. Polyurethane hose; 2. Pipe fitting assembly; 3. Anti-bending clamp. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0013] like Figure 1-3As shown, in this anti-bending polyurethane hose connection structure, the connection and positional relationships of each component are as follows: the polyurethane hose 1 is a hollow tube with internal threads on its inner wall at the end; one end of the hose connector assembly 2 has an external thread (preferably a trapezoidal thread) that matches the internal thread of the polyurethane hose 1, and the two are connected by threaded engagement, with the connection point located at the end port of the polyurethane hose 1; the other end of the hose connector body has an external thread, and the internal thread of the connecting nut matches the external thread. The connecting nut is fitted onto this end of the hose connector body and achieves connection with the external pipeline through threaded engagement. The annular sealing groove on the inner wall of the connecting nut is located in the middle of the threaded section of the pipe fitting body. The sealing ring is embedded in the annular sealing groove and fits tightly against the outer wall of the pipe fitting body. The two clamping blocks of the anti-bending clamp 3 are symmetrically distributed on both sides of the joint area between the polyurethane hose 1 and the pipe fitting body. The arc surface on the inner side of the clamping block is completely fitted against the outer wall of the polyurethane hose 1. The anti-slip texture at the arc surface is in contact with the outer wall of the hose. The two ends of the two clamping blocks are respectively inserted and tightened by fastening bolts (preferably two), so that the clamping blocks are clamped in the joint area (within 5-20mm from the end of the polyurethane hose 1).

[0014] In this implementation scheme, the components work synergistically through precise structural adaptation: the trapezoidal thread connection between the pipe fitting body and the polyurethane hose 1 has a larger tooth angle and stronger load-bearing capacity compared to ordinary threads, which can effectively resist the axial tensile force generated when the hose is bent, solving the problems of easy loosening of existing interference fits and poor anti-loosening performance of simple threaded connections; the combination of the annular sealing groove and the sealing ring of the connecting nut forms a secondary seal independent of the thread. After the sealing ring is compressed, it fits tightly against the outer wall of the pipe fitting body. Even if there is a small gap in the threaded fit due to vibration, the medium leakage channel can still be blocked through the sealing ring, making up for the shortcomings of existing seals that rely solely on thread seals; the symmetrical clamping block design of the anti-bending clamp 3 ensures that the clamping force is evenly distributed on both sides of the hose, avoiding hose deformation or clamping block offset caused by unilateral force, while the fastening bolts at both ends further ensure the stability of the clamping force and prevent the clamping blocks from loosening.

[0015] The core improvement lies in the curved surface and anti-slip texture design of the anti-bending clamp 3: the compatibility between the curved surface and the outer diameter of the hose, on the one hand, forcibly limits the minimum bending radius of the hose in the joint area (the bending radius is not less than the critical value corresponding to the curvature of the curved surface), physically preventing excessive bending and solving the problem of pipe wall rupture caused by the lack of constraint in the existing structure; on the other hand, the curved surface increases the contact area between the clamp and the hose, dispersing the stress concentrated at the joint during bending to the entire curved surface contact area, reducing the stress per unit area and preventing the hose from being damaged due to fatigue; the anti-slip texture increases friction to prevent relative sliding between the clamp and the hose during bending, ensuring the stability of the constraint position and avoiding sudden changes in local stress caused by sliding.

[0016] The anti-bending polyurethane hose connection structure of this utility model can be widely adapted to industrial hydraulic systems, pneumatic control pipelines, granular material conveying pipelines, and other scenarios. It can be linked with existing equipment (such as hydraulic pumps, air pumps, silo outlets, etc.) through standardized interfaces. The usage status of each structure and the connection details with existing technologies are as follows: Scenario 1: Connection with hydraulic pumps and hydraulic cylinders in industrial hydraulic systems In the prior art, hydraulic systems are usually powered by hydraulic pumps and connected to hydraulic cylinders via hoses to achieve reciprocating motion. Existing hose connection structures often suffer from leakage at the joints or hose bending and breakage due to high hydraulic oil pressure (10-30MPa) and equipment vibration.

[0017] Usage status and linkage details of this device: The polyurethane hose 1 is selected as a high-pressure resistant type (pressure ≥30MPa). The trapezoidal internal thread on the inner wall of its end engages with the trapezoidal external thread at one end of the pipe fitting body. After tightening, the thread sides fit tightly to form a preliminary seal, which is suitable for high-pressure working conditions of hydraulic systems. The external thread at the other end of the pipe fitting body matches the internal thread specification of the existing hydraulic pump (or hydraulic cylinder) interface (e.g., M30×1.5). After the connecting nut is fitted onto this end of the pipe fitting body, the pipe fitting body and the hydraulic pump interface are pre-tightened, and then the connecting nut is tightened. At this time, the nitrile rubber sealing ring in the annular sealing groove on the inner wall of the connecting nut is squeezed and tightly fits against the outer wall of the pipe fitting body and the end face of the hydraulic pump interface, forming a double seal of "thread seal + sealing ring seal", which solves the problem of easy leakage that relies solely on thread seal. Two symmetrical clamping blocks of the anti-bending clamp 3 are attached to the joint area between the polyurethane hose 1 and the pipe fitting body (10mm from the end of the hose). The inner arc surface of the clamping block (the radius is the same as the outer diameter of the hose) completely wraps the outer wall of the hose. The anti-slip texture of the arc surface is embedded in the tiny texture of the hose surface. It is clamped by the fastening bolts at both ends (torque 15-20N・m). When the hydraulic cylinder reciprocates and causes the hose to bend, the clamping block forces the hose to bend to a radius of not less than 50mm (critical anti-bending radius), avoiding excessive bending that could cause the pipe wall to break. At the same time, it disperses the vibration stress caused by the hydraulic oil pulse, solving the problem of bending damage caused by the lack of restraint in the existing structure.

[0018] Scenario 2: Connection between pneumatic control lines and air pumps / solenoid valves Existing pneumatic systems (pressure 0.5-1MPa) supply compressed air through an air pump, which is then connected to a solenoid valve to control the actuator via a hose. Existing structures often experience leaks or breakages due to loose joints caused by vibration and fatigue from repeated bending of the hose.

[0019] Usage status and linkage details of this device: The polyurethane hose 1 is a lightweight model (3mm wall thickness), with a smooth inner wall to reduce airflow resistance. Its end is connected to the hose fitting body by a common fine thread (such as M16×1), which is suitable for the low-pressure requirements of pneumatic systems. The external thread at the other end of the pipe fitting body matches the internal thread of the existing solenoid valve interface (such as G1 / 2). A fluororubber sealing ring (resistant to aging) is embedded in the annular sealing groove on the inner wall of the connecting nut. After tightening the connecting nut, the sealing ring is compressed by 20%. Even if the air pump vibration causes the thread to loosen slightly, the air leakage channel can still be blocked through the sealing ring, thus solving the existing air leakage problem. The clamping block of the anti-bending clamp 3 is made of plastic (to reduce weight), and the bolts at both ends are secured with anti-loosening nuts. The anti-slip texture on the arc surface of the clamping block is grid-like. When the solenoid valve frequently reverses and drives the hose to swing, the clamping block limits the swing angle of the hose to ≤45°. The anti-slip texture prevents the clamping block from sliding relative to the hose, and the anti-loosening bolts prevent the clamping force from weakening. This solves the problem of fatigue breakage of existing hoses due to repeated bending. At the same time, the lightweight design does not affect the sensitive operation of pneumatic components.

[0020] Scenario 3: Connection between the granular material conveying pipeline and the silo / conveyor pump Existing granular material (such as plastic granules and grains) conveying systems use conveying pumps to transport materials from silos to processing equipment via hoses. Existing structures often suffer from wear and leakage at hose interfaces due to material friction, or material accumulation and blockage when the hose is bent.

[0021] Usage status and linkage details of this device: The polyurethane hose 1 is selected with a smooth inner wall and is wear-resistant (inner wall roughness Ra≤0.8μm) to reduce material adhesion. Its end is connected to the pipe fitting body through a trapezoidal thread (large tooth angle reduces material jamming). Wear-resistant grease is applied to the thread engagement to prevent particles from entering the thread gap and causing wear. The other end of the pipe fitting body is connected to the existing silo outlet (or the inlet of the conveying pump) through a flange. The connecting nut is sleeved on the outside of the flange, and the flange is tightened by bolts. At this time, the sealing ring (polyurethane material, wear-resistant) on the inner wall of the connecting nut is sandwiched between the flange and the pipe fitting body to prevent material from leaking from the flange gap and solve the existing leakage problem. The inner arc radius of the clamping block of the anti-bending clamp 3 is slightly larger than the outer diameter of the hose (leaving a 5% gap) to avoid excessive clamping that could cause hose deformation. When the conveying pump starts or stops, causing the hose to bend slightly, the clamping block limits the bending radius to ≥100mm (to prevent material from accumulating at the bend). The gap between the arc surface and the hose allows the hose to expand slightly radially (to adapt to pressure fluctuations during material conveying). At the same time, the anti-slip texture prevents the clamping block from shifting with the hose vibration, ensuring stable constraint and solving the existing bending and clogging problem.

[0022] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A connection structure for a flexurally resistant polyurethane flexible hose (1), characterized in that, Includes polyurethane hose (1), pipe fitting assembly (2), and anti-bending clamp (3); The pipe fitting assembly (2) includes a pipe fitting body and a connecting nut. One end of the pipe fitting body is connected to the end of the polyurethane hose (1). The other end of the pipe fitting body is provided with an external thread. The connecting nut is provided with an internal thread that is adapted to the external thread. The connecting nut is threadedly engaged with the external thread of the pipe fitting body through the internal thread. The anti-bending clamp (3) includes two symmetrically arranged clamping blocks and at least one fastening bolt. The inner sides of the two clamping blocks opposite each other are provided with arc surfaces adapted to the outer diameter of the polyurethane hose (1). The two clamping blocks are clamped to the joint area between the polyurethane hose (1) and the pipe connector body by the fastening bolt to limit the degree of bending of the polyurethane hose (1) in this area.

2. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The end of the pipe fitting body that is connected to the polyurethane hose (1) is provided with an external thread, and the inner wall of the end of the polyurethane hose (1) is provided with an internal thread that is adapted to the external thread of the pipe fitting body. The pipe fitting body and the polyurethane hose (1) are connected by thread engagement.

3. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The inner wall of the connecting nut is provided with an annular sealing groove, and a sealing ring is provided in the annular sealing groove.

4. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The anti-bending clamp (3) has two fastening bolts, which are respectively located at both ends of the clamp block.

5. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The curved surface of the clamping block is provided with anti-slip texture.

6. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The polyurethane hose (1) has a hollow tubular structure with a smooth inner wall.

7. The connection structure of the anti-bending polyurethane hose (1) according to claim 1, characterized in that, The external thread of the pipe fitting body is a trapezoidal thread.

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