Anti-bending and anti-fatigue hose
Through anti-fatigue bionic hose and improved joint core and sleeve design, the problems of stress concentration and fatigue damage in the hose in digital hydraulic systems are solved, and the effects of anti-bending, anti-fatigue and efficient energy utilization are achieved.
Patent Information
- Application Number
- CN202422494416.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the digital hydraulic intelligent control system, existing hoses are prone to tear due to stress concentration, resulting in leakage failure, and beneficial pulsation energy is consumed, and the joint part is prone to fatigue and damage, which cannot meet the high-pressure pulsation flow impact requirements.
The anti-fatigue bionic hose structure is adopted, including the inner contact layer, the first reinforcement layer, the flame retardant sliding layer, the slip-resistant anti-folding layer and the anti-pull-off reinforcement layer. The joint core and sleeve are designed as limit rings, connecting rings and rubber-retaining groove structures, and the transitional tilt angle design is designed to buffer stress and avoid hard bites.
It improves the resistance to bending and fatigue resistance of the hose, reduces stress concentration, effectively utilizes beneficial pulsation energy, extends service life, prevents leakage, and enhances the connection strength and sealing of the joints.
Smart Images
Figure CN223282705U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of engineering machinery, and specifically relates to a bending-resistant and fatigue-resistant hose. Background Art
[0002] Regardless of whether the valve core of the digital hydraulic switch valve is rotated by a stepper motor or the valve core of a spool valve controlled by an electromagnet, the switching frequency of the valve generally does not exceed 100Hz per minute. Taking the switching frequency of 60Hz per minute as an example, the hose can only work for 200,000 pulses / 60Hz / 3600=0.9 hours. Therefore, if the equipment needs to work continuously for 500 hours, it will need more than 500*3600*60Hz=108e 6 Special pulsation-resistant hose with a maximum impact pulse resistance.
[0003] However, the rubber hoses currently used are divided into inner rubber, middle rubber and outer rubber. The material used for reinforcement in the middle rubber mostly adopts braided steel wire or wound steel wire as the reinforcement layer. The middle rubber is very thin, and the braided steel wire or wound steel wire rubs and squeezes each other. The standard requires that the pull-out force between the middle rubber and the steel wire is not less than 100N. Therefore, the relative buffer space between the steel wire and the middle rubber is small, and stress is easily concentrated when the pulsation frequency increases, causing tearing between the middle rubber and the steel wire, and driving tearing between the middle rubber and the inner rubber, thereby causing the inner rubber to rupture and cause leakage failure. Therefore, a hose that can effectively improve the bending resistance of the hose is urgently needed.
[0004] Especially when applied to digital hydraulic intelligent control systems, the use of four layers of steel wire winding can solve the impact of the lateral pressure fluctuations caused by the pump source itself in conventional hydraulic systems on the pipeline. However, the high-pressure pulsation pipeline it introduces and the method of discretely controlling the high-pressure liquid flow will introduce new pressure pulsations. If this pressure pulsation is concentrated in the steel pipe, since the elastic modulus of the steel pipe is much greater than the elastic modulus of the hydraulic oil, the main body of this pulse forms a forward force in the form of forward compression and rolling. This force is beneficial and can promote the rapid movement of the pulsation of the high-pressure liquid flow. However, due to the limitation of equipment space and the requirement for flexible use of hydraulic pipelines at movable joints, a hose-like structure in the form of a hose will still be used in the hydraulic system. However, if a conventional hose is used, since the inner layer of the hose is rubber and the steel wire is used as a reinforcement layer, this part of the beneficial pulsation will be absorbed and consumed by the elastic inner layer, resulting in energy loss. Therefore, a hose that can utilize this part of the beneficial pulsation rather than suppressing most of it is needed to adapt to modern discrete fluid transmission.
[0005] In addition, the joints at both ends of the hose are generally divided into a joint core and a sleeve. Most joint cores are equipped with sealing grooves and anti-pullout grooves for sealing and hooking the hose's inner rubber. These grooves and the hose's inner rubber are prone to bite, resulting in stress concentration at the bite point. Under pulse impact, the pulsating stress amplitude is also high. Under the action of the pulse, the inner rubber is easily fatigued and torn due to the hooking of the grooves, resulting in damage to the inner rubber, and further leading to oil leakage and failure. Therefore, a hose joint core connection mechanism that can effectively reduce stress concentration and stress amplitude between the joint core and the hose to improve fatigue resistance is urgently needed.
[0006] Inside the sleeve of the joint part, four annular "teeth" of the same inner diameter as the outer diameter of the hose are often used. The annular "teeth" are pressed against the outside of the hose through the plastic deformation of the sleeve, and the hose and the sleeve are prevented from being pulled out by friction. In this structure, when the hydraulic oil pulses inside the hose, the "tooth" closest to the hydraulic oil inside the hose is often subjected to the greatest force and strain. It is easy for this last tooth to tear, causing subsequent "teeth" to tear and pull out, or leakage before the specified lifespan occurs. Therefore, there is an urgent need for a hose sleeve connection mechanism that can effectively reduce stress concentration between the connected sleeve and the hose and reduce stress amplitude to improve fatigue resistance. Therefore, there is an urgent need for a hose that is resistant to bending and fatigue and can meet the high-pressure pulsating flow impact problem in digital hydraulic intelligent control systems. Utility Model Content
[0007] The present application provides a bending-resistant and fatigue-resistant hose to solve the above-mentioned technical problems in the existing hose, such as the tearing of the middle rubber and the steel wire in the hose, which drives the tearing between the middle rubber and the inner rubber, thereby causing the inner rubber to rupture and cause leakage failure; and the inner rubber is fatigue-torn due to the hooking of the groove of the joint core under the action of the pulse, resulting in damage to the inner rubber, and then leading to oil leakage and failure; and the joint sleeve connected to the hose is easily torn at this last tooth, causing the subsequent "teeth" to tear one after another and be pulled out, or leakage before reaching the specified service life, thereby improving the hose's ability to resist bending and fatigue.
[0008] The technical solutions adopted in this application are:
[0009] A bending and fatigue-resistant hose, characterized in that it includes a joint core, an anti-fatigue bionic hose and a sleeve; the anti-fatigue bionic hose comprises an inner contact layer, a first reinforcement layer, a flame-retardant sliding layer, a sliding anti-folding layer, an anti-pullout reinforcement layer and a weather-proof layer arranged in sequence from the inside to the outside along the radial direction; the first reinforcement layer is wrapped around the outside of the inner contact layer by aramid fiber cloth, the flame-retardant sliding layer is coated on the outside of the first reinforcement layer, and the sliding anti-folding layer is molded on the outside of the flame-retardant sliding layer; the inner contact layer and the first reinforcement layer form a resin tube, and the sliding anti-folding layer is made of rubber with a relatively large thickness and good elasticity; the contact force between the flame-retardant sliding layer and the first reinforcement layer of the resin tube is more than twice the contact force between the flame-retardant sliding layer and the sliding anti-folding layer, so that the bonding force between the flame-retardant sliding layer and the sliding anti-folding layer is less than the bonding force between the flame-retardant sliding layer and the resin tube, and this flexible bonding force length improves the bending resistance of the hose;
[0010] The joint core can be sleeved on the inner wall of the inner contact layer of the anti-fatigue bionic hose nozzle section, and the sleeve is sleeved on the outside of the anti-fatigue bionic hose and can be fixed to the core rod; the joint core has the limiting ring and the connecting ring distributed along the axial direction of the joint core, as well as the first glue-containing groove and the second glue-containing groove distributed along the axial direction of the joint core; the connecting ring has a hook connection surface on the side facing the limiting ring; the connecting ring has a positioning working surface for limiting the end face of the anti-fatigue bionic hose on the side facing the anti-fatigue bionic hose; a snap-fit groove is formed between the limiting ring and the hook connection surface of the connecting ring; the outer circumferential surface of the joint core inserted into the inner wall of the anti-fatigue bionic hose nozzle section is in smooth contact, and there is adhesive in the middle for bonding transition, and there is a transition deceleration angle of compression at the separation point between the joint core and the anti-fatigue bionic hose, so that a transitional pre-compression deformation space is formed at the contact and separation point between the anti-fatigue bionic hose and the joint core;
[0011] The sleeve includes a first compression ring, a second compression ring and a first connecting groove between the first compression ring and the second compression ring; the second compression ring has a limiting inclined surface facing the first compression ring for limiting; the sleeve compresses the anti-fatigue bionic hose and confines it in the pre-compression sliding space to enhance the anti-fatigue bionic hose's ability to resist bending and deformation.
[0012] The anti-bending and anti-fatigue hose of the present application also has the following additional technical features:
[0013] The limiting ring adopts a metal limiting ring or a plastic limiting ring; the limiting ring adopts the metal limiting ring, and the limiting ring has a limiting inclined surface on the side facing the buckling groove, which is used for the first pressing ring to use the limiting inclined surface to ensure that the first pressing ring slides completely into the buckling groove when the sleeve is buckled and deformed, so that the first pressing ring contacts and fits with the hook connection surface; the limiting ring adopts a plastic limiting ring, and the second pressing ring of the sleeve has a limiting inclined surface for limiting towards the first pressing ring, which can force the connecting ring to slide to the first connecting groove between the first pressing ring and the second pressing ring under the action of the limiting inclined surface when the sleeve is buckled and deformed.
[0014] The connecting ring has a positioning working surface perpendicular to the axis of the connector core along the axial direction of the connector core, which is used to limit the end face of the anti-fatigue bionic hose. The connector core after gluing is inserted into the anti-fatigue bionic hose. The first glue-containing groove and the second glue-containing groove distributed in the axial direction of the connector core accommodate excess glue when the connector core after gluing is inserted into the anti-fatigue bionic hose. It is used to correspond to the second pressing ring protruding from the inner wall of the sleeve on the side of the first pressing ring facing the anti-fatigue bionic hose, and the third pressing ring corresponds to the position of the sleeve after pressing. The positioning reference corresponding to the position is the hook connection surface where the connecting ring and the first pressing ring on the sleeve are hooked together, which is used to respectively locate the center positions of the first glue-containing groove and the second glue-containing groove, and the center positions of the second pressing ring and the third pressing ring.
[0015] The first glue containing groove and the second glue containing groove of the joint core have inner arc surfaces that are concave toward the center direction of the joint core.
[0016] The length of the arc from the first glue-containing groove of the joint core to the inner arc surface of the second glue-containing groove gradually decreases, so that the stress change generated by the inner contact layer of the resin tube with higher hardness in the depression is small, the strain change is not sudden but transitional, and the structure has the function of eliminating stress concentration.
[0017] The anti-pull-out reinforcement layer is connected to the outside of the sliding and anti-folding layer by winding carbon fiber cloth, and the weather-proof layer is formed outside the anti-pull-out reinforcement layer. The sleeve has at least one second pressing ring pressed on the anti-pull-out reinforcement layer or the weather-proof layer, ensuring that after the sleeve is pressed, the sliding and anti-folding layer with greater elasticity in the anti-fatigue bionic hose is compressed and confined to the pre-compression sliding space between the limiting inclined surface of the second pressing ring of the sleeve and the positioning working surface, ensuring that the carbon fiber cloth is not pulled out.
[0018] The angle range of the transition relief angle is 1°-10°, the extension length of the transition relief angle along the axial direction of the joint core does not exceed the inner diameter of the inner resin tube of the anti-fatigue bionic hose, and the compression amount of the transition relief angle along the axial direction of the joint core does not exceed 2% of the wall thickness of the inner resin tube of the anti-fatigue bionic hose.
[0019] A covering sleeve is provided on the portion of the sleeve that is separated from the anti-fatigue bionic hose, which is used to contact the weatherproof layer after being buckled to prevent the infiltration of rainwater, etc., and has the function of limiting the hard bite damage between the sleeve and the anti-pull-out reinforcement layer caused by excessive bending of the anti-fatigue bionic hose.
[0020] The inner wall of the sleeve has a first connecting groove that is engaged with the connecting ring of the head section of the joint core. The side of the first connecting groove of the sleeve facing the hose has a plurality of protruding teeth along the axial direction of the sleeve. The number of the protruding teeth is no more than three, namely, a first protruding tooth, a second protruding tooth, and a third protruding tooth.
[0021] The first protruding teeth, the second protruding teeth and the third protruding teeth are in a circular ring structure, or the first protruding teeth, the second protruding teeth and the third protruding teeth are in a threaded structure that is spirally connected to each other;
[0022] The inner diameters of the first protrusion, the second protrusion and the third protrusion away from the end of the hook connection surface where the sleeve and the joint core are connected gradually increase; or the inner diameters of the first protrusion, the second protrusion and the third protrusion away from the end of the hook connection surface where the sleeve and the joint core are connected gradually increase, forming an open tapered thread structure.
[0023] The second compression ring corresponds to the first glue-containing groove; the third compression ring corresponds to the second glue-containing groove, and is used to bend and deform the mouth end of the anti-fatigue bionic hose after buckling, so as to seal and prevent the hose from being pulled out from the joint core.
[0024] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:
[0025] 1. A bending and fatigue-resistant hose, comprising a joint core, an anti-fatigue bionic hose and a sleeve; the anti-fatigue bionic hose comprises an inner contact layer, a first reinforcement layer, a flame-retardant sliding layer and a sliding anti-bending layer, an anti-pull-off reinforcement layer and a weather-proof layer, which are arranged in sequence from the inside to the outside in the radial direction; the first reinforcement layer is wrapped around the outside of the inner contact layer through aramid fiber cloth, the flame-retardant sliding layer is coated on the outside of the first reinforcement layer, and the sliding anti-bending layer is formed on the outside of the flame-retardant sliding layer; the inner contact layer and the first reinforcement layer form a resin tube, and the sliding anti-bending layer is made of rubber with a relatively large thickness and good elasticity; the contact force between the flame-retardant sliding layer and the first reinforcement layer of the resin tube is greater than the contact force between the flame-retardant sliding layer and the first reinforcement layer of the resin tube The contact force between the sliding anti-bending layers is more than 2 times; it avoids the relatively small buffer space between the traditional steel wire and the intermediate rubber, which is prone to stress concentration when the pulsation frequency increases, causing the intermediate rubber and the steel wire to tear, and driving the tear between the intermediate rubber and the inner rubber, thereby causing the inner rubber to rupture and cause leakage failure, which can increase the bending resistance of the lifting hose; the steel wire is eliminated as a reinforcement layer, avoiding the traditional use of steel wire as a reinforcement layer, which causes part of the beneficial pulsation brought by the pressure pulsation to be absorbed and consumed by the more elastic internal part, causing energy loss, so that the present application can make full use of this part of the beneficial pulsation to adapt to modern discrete fluid transmission and realize the rapid movement of high-pressure liquid flow.
[0026] The joint core can be sleeved on the inner wall of the anti-fatigue bionic rubber hose orifice section, and the sleeve is sleeved on the outside of the anti-fatigue bionic rubber hose; the joint core has a limiting ring and a connecting ring distributed along the axial direction of the joint core, as well as a first glue-containing groove and a second glue-containing groove distributed along the axial direction of the joint core; the connecting ring has a hook connection surface on the side facing the limiting ring; the connecting ring has a positioning working surface on the side facing the anti-fatigue bionic rubber hose for limiting the end face of the anti-fatigue bionic rubber hose; a buckling groove is formed between the hook connection surface of the limiting ring and the connecting ring; The outer circumferential surface of the joint core of the inner wall of the anti-fatigue bionic hose nozzle section is in smooth contact, with adhesive in the middle for bonding transition. A transitional reduction angle for compression exists at the point where the joint core and the anti-fatigue bionic hose separate. The transitional reduction angle ranges from 1° to 10°. The extension length of the transitional reduction angle along the axis of the joint core does not exceed the inner diameter of the inner resin tube of the anti-fatigue bionic hose, and the compression amount of the transitional reduction angle along the axis of the joint core does not exceed 2% of the wall thickness of the inner resin tube of the anti-fatigue bionic hose. This creates a transitional pre-compression deformation space at the point where the anti-fatigue bionic hose and the joint core separate.
[0027] It ensures the uniform change of deformation during axial relative bending and sliding, reduces the tearing caused by stress concentration, and avoids the hard bite at the junction between the hose and the joint core when the hose is bent, thereby improving the bending resistance; after the sleeve is pressed, the sliding and folding resistance layer with greater elasticity in the fatigue-resistant bionic hose is compressed and confined to the pre-stressed sliding space. Regardless of whether the resin tube is subjected to axial movement or lateral impact by a pulse, it is buffered or absorbed by the pre-stressed sliding space of the sliding and folding resistance layer, reducing the stress amplitude, thereby improving the fatigue resistance of the fatigue-resistant bionic hose; from these two aspects, the joint of the hose also has a strong resistance to pulsating fatigue impact, and also has the ability to improve the resistance to bending deformation.
[0028] 2. As a preferred embodiment of the present application, a covering sleeve is provided at the portion where the sleeve is separated from the anti-fatigue bionic hose, which is used to contact the weatherproof layer after being buckled to prevent the infiltration of rainwater, etc., and has the function of limiting the hard bite damage between the sleeve and the anti-pull-out reinforcement layer caused by excessive bending of the anti-fatigue bionic hose.
[0029] The first and second adhesive grooves between the joint core and the anti-fatigue bionic hose have a loose transition fit with the joint core. The first and second adhesive grooves are easy to install with the adhesive between the joint core and the joint core. The adhesive has a certain connection length to ensure the relative tensile slippage and sealing length of the cured adhesive between the anti-fatigue bionic hose and the joint core during pulsation, which is used to buffer the impact of pulsation and prevent leakage. The anti-fatigue bionic hose is a composite hose that imitates the structure of arterial blood vessels. The arc length of the inner arc surface from the first adhesive groove to the second adhesive groove of the joint core gradually decreases, so that the stress change of the inner contact layer of the resin tube with higher hardness in the depression is small, the strain change is not abrupt but transitional, and the structure has a stress concentration elimination effect. For example: the radius of the first adhesive groove ranges from 2-3mm; the radius of the second adhesive groove ranges from 1-1.5mm, thereby solving the oil leakage problem caused by the damage of the inner glue due to improper setting of the sealing groove and the anti-pull-out groove at the two end joints of the general hose.
[0030] 3. As a preferred embodiment of the present application, the inner wall of the sleeve has a first connecting groove that is engaged with the connecting ring of the head section of the joint core, and the side of the first connecting groove of the sleeve facing the hose has multiple protrusions along the axial direction of the sleeve, and the number of protrusions is no more than 3, namely the first protrusion, the second protrusion and the third protrusion; the first protrusion, the second protrusion and the third protrusion are in a circular ring structure, or the first protrusion, the second protrusion and the third protrusion are in a threaded structure that is spirally connected to each other; the inner diameters of the first protrusion, the second protrusion and the third protrusion gradually increase at the end away from the hook connection surface where the sleeve is connected to the joint core; or the inner diameters of the parts of the first protrusion, the second protrusion and the third protrusion away from the end where the sleeve is connected to the joint core gradually increase, forming an open tapered thread structure.
[0031] This prevents the old structure from causing the "tooth" closest to the hydraulic oil inside the hose to be subjected to the greatest force and strain when the hydraulic oil pulses inside the hose. It is easy for the last tooth to tear, causing subsequent "teeth" to tear and fall out, or leakage before the specified service life.
[0032] 4. As a preferred embodiment of the present application, the first glue containing groove and the second glue containing groove of the joint core have inner arc surfaces that are concave in the radial direction of the joint core.
[0033] The first glue containing groove and the second glue containing groove of the joint core are spaced apart along the axial direction of the joint core, and the purpose is to accommodate the adhesive for bonding the joint core and the anti-fatigue bionic hose, and provide sufficient accommodation space for the adhesive, so that the joint core and the anti-fatigue bionic hose can be more tightly fitted after the adhesive is applied between the joint core and the anti-fatigue bionic hose. Since the first glue containing groove and the second glue containing groove are recessed inward, that is, recessed on the outer peripheral surface of the joint core, no bulge will be formed between the anti-fatigue bionic hose and the joint core after the anti-fatigue bionic hose is connected to the joint core, resulting in a bulge on the surface after the anti-fatigue bionic hose is connected to the joint core, thereby affecting the subsequent connection of the sleeve. In order to increase the fluidity of the adhesive flow, the first glue containing groove and the second glue containing groove are set to an inner arc surface in the shape of a circular arc, so that the inner wall of the first glue containing groove and the second glue containing groove is smoother, which is convenient for the connection and assembly between the joint core and the anti-fatigue bionic hose.
[0034] 5. As a preferred embodiment of the present application, the length of the arc surface from the first glue-containing groove to the second glue-containing groove of the joint core gradually decreases.
[0035] The first and second accommodating grooves should not have radii that are too large. The length of the inner arc surface of the first and second adhesive accommodating grooves from one end to the other end of the connector core gradually decreases to ensure that the anti-bending stress concentration is reduced. The first and second adhesive accommodating grooves are arranged along the axis of the connector core, which can not only increase the extension length of the groove, thereby increasing the sealing length between the anti-fatigue bionic rubber hose and the connector core, but also achieve a stronger stretching of the adhesive inside the first and second adhesive accommodating grooves, thereby increasing the elastic deformation of the adhesive, thereby increasing the elastic deformation capacity between the anti-fatigue bionic rubber hose and the connector core, thereby reducing the bending force during the bending deformation of the hose and reducing the bending stress amplitude. In addition, the second compression ring corresponds to the first adhesive accommodating groove; the third compression ring corresponds to the second adhesive accommodating groove, and is used to bend the mouth end of the anti-fatigue bionic rubber hose after buckling, for sealing and preventing the rubber hose from being pulled out of the connector core. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0037] Figure 1 This is a schematic structural diagram of a bending and fatigue resistant hose according to one embodiment of the present application;
[0038] Figure 2 This is a schematic structural diagram of a joint core of a bending and fatigue-resistant hose according to one embodiment of the present application;
[0039] Figure 3 This is a schematic structural diagram of a sleeve of a bending-resistant and fatigue-resistant hose according to one embodiment of the present application;
[0040] Figure 4 This is a schematic diagram of the internal structure of a bending and fatigue resistant hose before the sleeve and the connector core are fastened together according to one embodiment of the present application;
[0041] Figure 5 This is a schematic diagram of the internal structure of a bending and fatigue-resistant hose according to one embodiment of the present application;
[0042] In the figure,
[0043] 1. Connector core; 2. Anti-fatigue bionic hose; 3. Sleeve; 4. Limiting ring; 5. Connecting ring; 6. First adhesive groove; 7. Second adhesive groove; 8. Limiting inclined surface; 9. Positioning working surface; 10. First connecting groove; 11. Protruding teeth; 12. First pressing ring; 13. Second pressing ring; 14. Buckling groove; 15. Third pressing ring; 16. First protruding teeth; 17. Second protruding teeth; 18. Third protruding teeth; 19. Limiting inclined surface; 20. Hooking connecting surface; 21. Inner contact layer; 22. First reinforcement layer; 23. Flame-retardant sliding layer; 24. Sliding and anti-bending layer; 25. Anti-pullout reinforcement layer; 26. Weatherproof layer.
[0044] R1-transition slowdown angle;
[0045] R2-the angle between the tangent plane of the outer periphery of one end of the joint core facing the inside of the anti-fatigue bionic rubber hose and the axis; DETAILED DESCRIPTION
[0046] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.
[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.
[0048] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.
[0049] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0050] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the reference terms "implementation method", "embodiment", "one embodiment", "example" or "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.
[0051] This application relates to a bending and fatigue resistant hose, such as Figure 1-5 As shown, a bending and fatigue-resistant hose comprises a joint core 1, an anti-fatigue bionic hose 2 and a sleeve 3; the anti-fatigue bionic hose 2 comprises an inner contact layer, a first reinforcement layer, a flame-retardant sliding layer, a sliding anti-folding layer, an anti-pullout reinforcement layer and a weather-proof layer arranged in sequence from the inside to the outside in the radial direction; the first reinforcement layer is wrapped around the outer side of the inner contact layer by aramid fiber cloth, the flame-retardant sliding layer is coated on the outer side of the first reinforcement layer, and the sliding anti-folding layer is formed on the outer side of the flame-retardant sliding layer; the inner contact layer and the first reinforcement layer form a resin tube, and the sliding anti-folding layer is made of rubber with a relatively large thickness and good elasticity; the contact force between the flame-retardant sliding layer and the first reinforcement layer of the resin tube is more than twice the contact force between the flame-retardant sliding layer and the sliding anti-folding layer; so that the bonding force between the flame-retardant sliding layer and the sliding anti-folding layer is smaller than the bonding force between the flame-retardant sliding layer and the resin tube, and this flexible bonding force length improves the bending resistance of the hose;
[0052] The joint core 1 can be sleeved on the inner wall of the inner contact layer of the anti-fatigue bionic rubber hose 2, and the sleeve 3 is sleeved on the outside of the anti-fatigue bionic rubber hose 2 and can be fixed to the core rod; the joint core 1 has a limiting ring 4 and a connecting ring 5 distributed along the axial direction of the joint core 1, as well as a first glue-containing groove 6 and a second glue-containing groove 7 distributed along the axial direction of the joint core 1; the connecting ring 5 has a hook connection surface 20 on the side facing the limiting ring 4; the connecting ring 5 has a positioning working surface 9 for limiting the end face of the anti-fatigue bionic rubber hose 2 on the side facing the anti-fatigue bionic rubber hose 2; a buckling groove 14 is formed between the limiting ring 4 and the hook connection surface 20 of the connecting ring 5; the joint is sleeved on the inner wall of the anti-fatigue bionic rubber hose 2. The outer circumferential surface of the inserted joint core 1 section of the core 1 is in contact with a smooth surface, with adhesive in the middle for bonding transition, and there is a transitional deceleration angle of compression at the separation point between the joint core 1 and the anti-fatigue bionic hose 2, so that a transitional pre-compression deformation space is formed at the contact and separation point between the anti-fatigue bionic hose and the joint core; the sleeve 3 includes a first compression ring 12, a second compression ring 13 and a first connecting groove 10 between the first compression ring 12 and the second compression ring 13; the second compression ring 13 has a limiting inclined surface 19 for limiting toward the first compression ring 12; the sleeve 3 presses the anti-fatigue bionic hose 2 and confines it in the pre-compression sliding space to enhance the anti-fatigue bionic hose 2's ability to resist bending and deformation.
[0053] The anti-bending and anti-fatigue hose of the present application ensures uniform changes in deformation during axial relative bending and sliding, reduces tearing caused by stress concentration, and also avoids hard biting at the junction between the hose and the joint core when the hose is bent, thereby improving the bending resistance; after the sleeve is pressed, the sliding and anti-folding layer with greater elasticity in the anti-fatigue bionic hose is compressed and confined in the pre-stressed sliding space, regardless of whether the resin tube is subjected to axial movement or lateral impact by the pulse, it is buffered or absorbed by the pre-stressed sliding space of the sliding and anti-folding layer, reducing the stress amplitude, thereby improving the anti-fatigue ability of the anti-fatigue bionic hose; from these two aspects, the joint of the hose is improved to have a stronger ability to resist pulsating fatigue impact, while also having the ability to resist bending and deformation.
[0054] The purpose of forming a pre-stressed transition space between the joint core 1 and the pipe mouth section of the anti-fatigue bionic hose 2 in this application is to facilitate installation and ensure that there is a transition deformation space between the anti-fatigue bionic hose 2 and the joint core 1 that is resistant to bending and deformation. There are no grooves or protrusions between the glue groove and the outer chamfer of the tail end of the joint core 1, ensuring sufficient roundness and smoothness. The inner wall of the pipe mouth section of the anti-fatigue bionic hose 2 also has sufficient roundness and smoothness. The fitting clearance with the joint core 1 is a loose transition fit, and the fitting glue between them is convenient for installation. It has a certain fitting connection length to ensure the relative tensile slippage and sealing length of the cured glue between the anti-fatigue bionic hose 2 and the joint core 1 during pulsation, which is used to buffer the impact of pulsation and prevent leakage. The anti-fatigue bionic hose 2 is a composite hose that imitates the structure of arterial blood vessels.
[0055] It should be noted that the anti-fatigue bionic hose 2 includes an inner contact layer 21, a first reinforcement layer 22, a flame-retardant sliding layer 23, a sliding anti-folding layer 24, an anti-pull-out reinforcement layer 25 and a weather-proof layer 26, which are arranged in sequence from the inside to the outside along the radial direction; the first reinforcement layer 22 is wrapped around the outside of the inner contact layer 21 through aramid fiber cloth, the flame-retardant sliding layer 23 is coated on the outside of the first reinforcement layer 22, the sliding anti-folding layer 24 is connected to the outside of the flame-retardant sliding layer 23 through extrusion molding, the anti-pull-out reinforcement layer 25 is connected to the outside of the sliding anti-folding layer 24 through carbon fiber cloth, and the weather-proof layer 26 is connected to the outside of the anti-pull-out reinforcement layer 25 through extrusion molding.
[0056] As a preferred embodiment, Figure 1-2 As shown, the end of the limiting ring 4 facing the positioning cone forms a limiting inclined surface 8 for supporting the sleeve 3 to be pulled out; the interior of the sleeve 3 has a first pressing ring 12 protruding from the inner wall of the sleeve and abutting against the limiting inclined surface. When in use, the anti-fatigue bionic hose 2 is sleeved on the outer side of the joint core 1, as shown in FIG. Figure 2 In the orientation shown in the figure, the anti-fatigue bionic hose 2 is inserted into the joint core 1 from the right side of the joint core 1 until the left end of the anti-fatigue bionic hose 2 can abut against the limiting slope 8 of the limiting ring 4, thereby ensuring the positioning accuracy of the connection position between the anti-fatigue bionic hose 2 and the joint core 1, and also realizing a tight connection between the anti-fatigue bionic hose 2 and the joint core 1.
[0057] The limiting ring 4 is a metal limiting ring or a plastic limiting ring; the limiting ring is a metal limiting ring, and the limiting ring has a limiting inclined surface 8 on the side facing the buckling groove 14, which is used to ensure that the first pressing ring 12 can completely slide into the buckling groove 14 by using the limiting inclined surface 8 when the sleeve 3 is buckled and deformed, so that the first pressing ring 12 is in contact with the hook connection surface 20; the limiting ring 4 is a plastic limiting ring, and the second pressing ring 13 of the sleeve 3 has a limiting inclined surface 19 for limiting toward the first pressing ring 12, which can force the connecting ring 5 to slide to the first connecting groove 10 between the first pressing ring 12 and the second pressing ring 13 under the action of the limiting inclined surface 19 when the sleeve 3 is buckled and deformed.
[0058] Since the joint core 1 is made of 45# steel, its strength is much greater than that of the sleeve made of 20# steel. When the sleeve is buckled and deformed, the first compression ring 12 also slides completely into the buckling groove 14, so that the contact surface of the first compression ring 12 and the connecting ring 5 fit together; thereby ensuring that the connecting ring 5 on the joint core and the first compression ring 12 on the sleeve are hooked together to form a rigid whole that can cover the pipe mouth section of the anti-fatigue bionic hose 2.
[0059] The limiting ring is composed of a metal ring fixed on the joint core, or a plastic ring matched with the fixing groove of the joint core.
[0060] Embodiment 1: The limiting ring 4 protrudes along the radial direction of the connector core 1 and is connected to the outer peripheral surface of the connector core 1 to form a circular ring structure. The limiting ring 4 is connected to the connector core 1 to form an integrated structure; thereby, the connection strength between the limiting ring 4 and the connector core 1 can be enhanced, thereby strengthening the abutment effect on the sleeve 3, and further improving the overall connection strength of the anti-bending hose.
[0061] Alternatively, implementation method two is to connect the limiting ring 4 to the outer peripheral surface of the joint core by means of a plastic circular ring sleeve to form a raised annular structure. When the sleeve connection method is adopted, a groove can be provided at the position where the joint core 1 is connected to the limiting ring 4. The size of the groove can be adapted to the limiting ring 4, so that the limiting ring 4 is engaged with the groove, thereby the limiting ring 4 and the joint core 1 are matched and limitedly connected.
[0062] As a preferred embodiment, Figure 1-2 As shown, the connecting ring 5 has a positioning working surface 9 perpendicular to the axis of the joint core 1 along the axial direction of the joint core 1 and is used to limit the end face of the anti-fatigue bionic hose 2; the interior of the sleeve 3 is located on one side of the first compression ring 12 and has a second compression ring 13 protruding from the inner wall of the sleeve and abutting against the positioning working surface. The second compression ring 13 forms an inclined abutting surface toward the side of the positioning working surface so that the first compression ring 12 is embedded in the buckle groove.
[0063] In actual application, it is necessary to sleeve the anti-fatigue bionic hose 2 on the outside of the joint core 1. In order to facilitate the fixation of the anti-fatigue bionic hose 2 and the joint core 1, enhance the connection strength and installation position accuracy between the anti-fatigue bionic hose 2 and the joint core 1, a connecting ring 5 is provided on the side of the limiting ring 4 of the joint core 1 along the axial direction facing the first glue-containing groove 6. The purpose of the connecting ring 5 is to be able to install the end face of the anti-fatigue bionic hose 2. Specifically, the connecting ring 5 protrudes from the outer periphery of the joint core 1 at a certain height along the radial direction of the joint core 1, so that the connecting ring 5 can be annularly connected to the outside of the joint core. A positioning working surface 9 is formed between the outer peripheral surface of the connecting ring 5 and the outer peripheral surface of the joint core 1. When in use, one end of the anti-fatigue bionic hose 2 is pulled out from the joint core 1 such as Figure 2 The right side of the position shown is inserted into the left side until the left end surface of the anti-fatigue bionic hose 2 abuts against the positioning working surface 9, thereby completing the assembly between the anti-fatigue bionic hose 2 and the joint core 1.
[0064] It should be noted that by setting the limiting ring 4 and the connecting ring 5, the position and coaxiality between the sleeve 3 and the anti-fatigue bionic hose 2 and the joint core 1 can be further enhanced, wherein the limiting inclined surface 19 of the limiting ring 4 and the sleeve 3 can ensure the axial position, and the connecting ring 5 and the first connecting groove 10 of the sleeve 3 can ensure the coaxiality, avoiding deviation in the alignment between the sleeve 3 and the anti-fatigue bionic hose 2, and between the anti-fatigue bionic hose 2 and the joint core 1, thereby reducing the connection strength between the joint core 1, the anti-fatigue bionic hose 2 and the sleeve 3, and further enhancing the bending resistance of the hose.
[0065] As a preferred embodiment, Figure 2 As shown, the first glue containing groove 6 and the second glue containing groove 7 of the joint core 1 have inner arc surfaces that are concave toward the center of the joint core 1 .
[0066] The first glue containing groove 6 and the second glue containing groove 7 of the connector core 1 are spaced apart along the axial direction of the connector core 1. The purpose is to accommodate the adhesive for bonding the connector core and the anti-fatigue bionic hose 2, and to provide sufficient space for the adhesive so that the fitting surface between the connector core and the anti-fatigue bionic hose 2 is tighter after the adhesive is applied between the connector core and the anti-fatigue bionic hose 2. Since the first glue containing groove 6 and the second glue containing groove 7 are recessed inward, that is, recessed on the outer peripheral surface of the connector core, when the anti-fatigue bionic hose 2 is connected to the connector core 1, no bulge will be formed between the anti-fatigue bionic hose 2 and the connector core 1, resulting in a bulge on the surface after the anti-fatigue bionic hose 2 is connected to the connector core 1, thereby affecting the subsequent connection of the sleeve 3. In order to increase the fluidity of the adhesive flow, the first glue containing groove 6 and the second glue containing groove 7 are set to an inner arc surface in the shape of a circular arc, so that the inner wall of the first glue containing groove 6 and the second glue containing groove 7 is smoother and convenient for fluid movement.
[0067] As a preferred embodiment, the length between the first glue-containing groove 6 and the second glue-containing groove 7 of the joint core 1 is not greater than the arc radius of the inner arc surface of the minimum glue-containing groove 7, and the arc length of each glue-containing groove gradually decreases, so that the stress change generated by the inner contact layer with higher hardness of the resin tube at the depression is continuous, the strain does not suddenly change and has a transition, thereby having a transition structure that reduces sudden changes and eliminates stress concentration.
[0068] The first accommodating groove and the second accommodating groove should not be too large in radius, and Figure 2In the orientation shown, the arc length of the inner arc surface of the first glue-containing groove 6 and the second glue-containing groove 7 from the left end to the right end of the joint core 1 gradually decreases. This is to ensure that the anti-bending stress concentration is reduced. The first glue-containing groove 6 and the second glue-containing groove 7 are arranged along the axial direction of the joint core 1, which can not only increase the extension length of the groove, thereby increasing the sealing length between the anti-fatigue bionic hose 2 and the joint core 1, but also enable the first glue-containing groove 6 and the second glue-containing groove 7 to accommodate more glue, so that the elastic sealing deformation of the cured glue gradually increases, thereby making the seal between the anti-fatigue bionic hose 2 and the joint core 1 more reliable, and the smooth connecting surface of the inner contact layer 21 with higher hardness in the anti-fatigue bionic hose 2 can increase the tensile slip strain generated by bending during the bending deformation of the hose without increasing the contact stress, thereby increasing the allowable bending strain of the hose.
[0069] Preferably, the radius of the first accommodation groove is in the range of 2-3 mm; the radius of the second accommodation groove is in the range of 1-1.5 mm.
[0070] As a preferred embodiment, Figure 2 As shown, the angle range of the transition deceleration angle R1 is 1°-10°, the extension length of the transition deceleration angle along the axial direction of the joint core 1 does not exceed the inner diameter of the inner resin tube of the anti-fatigue bionic hose 2, and the compression amount of the transition deceleration angle along the axial direction of the joint core does not exceed 2% of the wall thickness of the inner resin tube of the anti-fatigue bionic hose 2.
[0071] By adding a transition slowing angle, the anti-fatigue bionic hose 2 is not damaged during the insertion of the connector core 1 into the connector core 1 or during the sleeve connection between the anti-fatigue bionic hose 2 and the connector core 1, which is beneficial for installation and ensuring the coaxiality between the anti-fatigue bionic hose 2 and the connector core 1. On the other hand, a pre-stressed transition space is formed at the connection and separation point between the anti-fatigue bionic hose 2 and the connector core 1, so that a transition deformation space that resists bending and deformation exists between the anti-fatigue bionic hose 2 and the connector core 1, which is used to buffer the impact of pulsation and prevent leakage. The anti-fatigue bionic hose 2 is a composite hose that imitates the structure of an arterial blood vessel.
[0072] As a preferred embodiment, the transition deceleration angle R2 of the joint core 1 is located after the transition deceleration angle R1 and has a smaller transition deceleration angle, the slope of which is generally not greater than 1°. It is mainly used to ensure the installation coaxiality and the pre-compression transition space with smaller compression deformation change between the anti-fatigue bionic hose 2 and the joint core 1, so that there is a further transitional anti-bending deformation transition deformation space between the anti-fatigue bionic hose 2 and the joint core 1, which is used to buffer the impact of pulsation.
[0073] In actual processing, the outer periphery of the connector core 1 needs to be cut at an angle so that Figure 2In the orientation shown, the section of the outer periphery of the right end of the joint core 1 is inclined to the axis of the joint core 1 at an angle of no more than 1°, and then the transition angle between the outer periphery of the right end of the joint core 1 and the right end face is reduced.
[0074] A covering sleeve is provided on the portion of the sleeve 3 which is separated from the anti-fatigue bionic hose 2, which is used to contact the weatherproof layer after being buckled to prevent the infiltration of rainwater, etc., and has the function of limiting the hard bite damage between the sleeve 3 and the anti-pull-out reinforcement layer caused by excessive bending of the anti-fatigue bionic hose 2.
[0075] As a preferred embodiment, the inner wall of the sleeve 3 has a first connecting groove 10 that is engaged with the limiting ring 4 of the head section of the joint core 1. One side of the first connecting groove 10 of the sleeve 3 has a plurality of grooves recessed toward the inner wall of the sleeve 3 along the axial direction of the sleeve 3, and convex teeth 11 are formed between adjacent grooves; the convex teeth 11 are in a circular ring structure or the convex teeth 11 are in a threaded structure.
[0076] When the convex tooth 11 is in a circular ring structure, the inner side wall of the convex tooth 11 is a smooth arc surface, which can abut the outer periphery of the anti-fatigue bionic hose 2; when the convex tooth 11 is in a threaded structure, the raised threaded tooth structure can be more pressed into the outer side of the anti-fatigue bionic hose 2 and the first glue-containing groove 6 to the second glue-containing groove 7 of the joint core 1, so that the sleeve 3 and the joint core 1 and the anti-fatigue bionic hose 2 between the sleeve 3 and the joint core 1 are firmly connected.
[0077] Furthermore, the protruding teeth 11 can be distributed in a variety of ways, not limited to the present application, and any of the following ways can be adopted:
[0078] Embodiment 1: The inner wall of the sleeve 3 has a first connecting groove 10 that is engaged with the connecting ring 5 of the head section of the joint core 1. The side of the first connecting groove 10 of the sleeve 3 facing the hose has multiple protrusions along the axial direction of the sleeve 3. The number of protrusions does not exceed 3, namely, a first protrusion 16, a second protrusion 17 and a third protrusion 18; the first protrusion 16, the second protrusion 17 and the third protrusion 18 are in a circular ring structure, or the first protrusion 16, the second protrusion 17 and the third protrusion 18 are in a threaded structure that is spirally connected to each other; the inner diameter of the first protrusion 16, the second protrusion 17 and the third protrusion 18 gradually increases away from the hook connection surface 20 where the sleeve 3 is connected to the joint core 1.
[0079] Embodiment 2: The inner diameters of the first protruding teeth 16 , the second protruding teeth 17 and the third protruding teeth 18 at the end away from the connection between the sleeve 3 and the joint core 1 gradually increase to form an open tapered thread structure.
[0080] For example, when the number of protruding teeth is 3, the inner diameter of the first protruding tooth 16 is larger than the inner diameters of the second protruding tooth 17 and the third protruding tooth 18 , and the inner diameters of the second protruding tooth 17 and the third protruding tooth 18 are the same.
[0081] As a preferred embodiment, the second compression ring 13 corresponds to the first glue containing groove 6; the third compression ring 15 corresponds to the second glue containing groove 7, which is used to bend and deform the mouth end of the anti-fatigue bionic hose 2 after buckling, for sealing and preventing the hose from being pulled out from the joint core 1.
[0082] The second compression ring 13 corresponds to the first glue containing groove 6; the third compression ring 15 corresponds to the second glue containing groove 7 to realize the buckling connection of the anti-fatigue bionic hose 2 located on the inner side of the sleeve 3, so that the anti-fatigue bionic hose 2 can be elastically deformed under the extrusion of the sleeve 3, and bend and deform inward on both sides at the buckling position, thereby further enhancing the tight connection between the sleeve 3 and the anti-fatigue bionic hose 2, preventing the sleeve 3 from slipping from the outside of the anti-fatigue bionic hose 2, thereby further enhancing the anti-pullout performance between the anti-fatigue bionic hose 2 located inside the sleeve 3 and the joint core 1, avoiding the convex teeth of the sleeve 3, especially the convex teeth at the rightmost end, which leads to the convex teeth and the anti-fatigue bionic hose 2 being torn one after another and being pulled out or leakage before reaching the specified life, thereby improving the service life of the entire anti-bending hose.
[0083] Anything not described in this application can be achieved by adopting or drawing on existing technologies.
[0084] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.
[0085] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.
Claims
1. A bending and fatigue resistant hose, characterized in that: The invention comprises a joint core (1), an anti-fatigue bionic rubber hose (2) and a sleeve (3); the anti-fatigue bionic rubber hose (2) comprises an inner contact layer, a first reinforcement layer, a flame-retardant sliding layer, a sliding anti-folding layer, an anti-pullout reinforcement layer and a weatherproof layer arranged in sequence from the inside to the outside in a radial direction; the first reinforcement layer is wound around the outside of the inner contact layer through aramid fiber cloth, the flame-retardant sliding layer is coated on the outside of the first reinforcement layer, and the sliding anti-folding layer is formed on the outside of the flame-retardant sliding layer; the inner contact layer and the first reinforcement layer form a resin tube, and the sliding anti-folding layer is made of rubber with a relatively large thickness and good elasticity; the contact force between the flame-retardant sliding layer and the first reinforcement layer of the resin tube is greater than the contact force between the flame-retardant sliding layer and the sliding anti-folding layer by more than 2 times, so that the bonding force between the flame-retardant sliding layer and the sliding anti-folding layer is less than the bonding force between the flame-retardant sliding layer and the resin tube, and this flexible bonding force length improves the bending resistance of the rubber hose; The joint core (1) can be sleeved on the inner wall of the inner contact layer of the pipe mouth section of the anti-fatigue bionic rubber hose (2); the sleeve (3) is sleeved on the outside of the anti-fatigue bionic rubber hose (2) and can be fixed to the core rod; the joint core (1) has a limiting ring (4) and a connecting ring (5) distributed along the axial direction of the joint core (1), as well as a first glue-containing groove (6) and a second glue-containing groove (7) distributed along the axial direction of the joint core (1); the connecting ring (5) has a hook connection surface (20) on the side facing the limiting ring (4); the connecting ring (5) has a hook connection surface (20) on the side facing the anti-fatigue bionic rubber hose (2). There is a positioning working surface (9) for limiting the end face of the anti-fatigue bionic hose (2); a buckling groove (14) is formed between the limiting ring (4) and the hook connection surface (20) of the connecting ring (5); the outer circumferential surface of the joint core (1) inserted into the section of the joint core (1) is in contact with the inner wall of the pipe mouth section of the anti-fatigue bionic hose (2) in a smooth manner, with adhesive in the middle for bonding transition, and a transitional deceleration angle of compression exists at the separation point between the joint core (1) and the anti-fatigue bionic hose (2), so that a transitional pre-compression deformation space is formed at the contact and separation point between the anti-fatigue bionic hose and the joint core; The sleeve (3) comprises a first compression ring (12), a second compression ring (13) and a first connecting groove (10) between the first compression ring (12) and the second compression ring (13); the second compression ring (13) has a limiting inclined surface (19) for limiting position toward the first compression ring (12); the sleeve compresses and confines the anti-fatigue bionic hose in a pre-pressed sliding space to enhance the anti-bending and deformation resistance of the anti-fatigue bionic hose.
2. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: The limiting ring (4) is a metal limiting ring or a plastic limiting ring; The limiting ring adopts the metal limiting ring, and the limiting ring has a limiting inclined surface (8) on the side facing the buckling groove (14), so that when the sleeve (3) is buckled and deformed, the first pressing ring (12) can use the limiting inclined surface (8) to ensure that the first pressing ring (12) completely slides into the buckling groove (14), so that the first pressing ring (12) contacts and fits with the hook connection surface (20); The limiting ring (4) is a plastic limiting ring, and the second pressing ring (13) of the sleeve (3) has a limiting inclined surface (19) facing the first pressing ring (12) for limiting. When the sleeve (3) is buckled and deformed, the connecting ring (5) can be forced to slide to the first connecting groove (10) between the first pressing ring (12) and the second pressing ring (13) under the action of the limiting inclined surface (19).
3. The anti-bending and anti-fatigue hose according to claim 2, characterized in that: The connecting ring (5) has a positioning working surface (9) perpendicular to the axis of the connector core (1) along the axial direction of the connector core (1) for limiting the end face of the anti-fatigue bionic rubber hose (2), and is used for limiting the position of the connector core (1) after being glued and inserted into the anti-fatigue bionic rubber hose (2); the first glue containing groove (6) and the second glue containing groove (7) distributed in the axial direction of the connector core (1) contain excess glue when the connector core (1) after being glued is inserted into the anti-fatigue bionic rubber hose (2), and are used to adjust the internal position of the sleeve (3). A second pressing ring (13) is provided on the side of the first pressing ring (12) facing the anti-fatigue bionic rubber hose (2) and protrudes from the inner wall of the sleeve (3). A third pressing ring (15) is located at a corresponding position after the sleeve is pressed. The corresponding positioning reference is a hook connection surface (20) where the connecting ring (5) and the first pressing ring (12) on the sleeve are hooked together, and is used to locate the center positions of the first glue containing groove (6) and the second glue containing groove (7), as well as the center positions of the second pressing ring (13) and the third pressing ring (15).
4. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: The first glue containing groove (6) and the second glue containing groove (7) of the joint core (1) have inner arc surfaces that are recessed toward the center of the joint core (1).
5. The anti-bending and anti-fatigue hose according to claim 4, characterized in that: The length of the arc of the inner arc surface from the first glue-containing groove (6) to the second glue-containing groove (7) of the joint core (1) gradually decreases, so that the stress change generated by the inner contact layer of the resin tube with higher hardness in the recess is small, the strain change is not abrupt but transitional, and the structure has the function of eliminating stress concentration.
6. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: The anti-pull-out reinforcement layer is connected to the outside of the slip and folding resistance layer by winding carbon fiber cloth, and the weatherproof layer is formed outside the anti-pull-out reinforcement layer. The sleeve (3) has at least one second pressing ring (13) pressed on the anti-pull-out reinforcement layer or the weatherproof layer, ensuring that after the sleeve is pressed, the slip and folding resistance layer with greater elasticity in the anti-fatigue bionic rubber hose is compressed and limited to the pre-pressed slip space between the limiting inclined surface (19) of the second pressing ring (13) of the sleeve (3) and the positioning working surface (9), ensuring that the carbon fiber cloth is not pulled out.
7. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: The angle range of the transition slowing angle is 1°-10°, the extension length of the transition slowing angle along the axial direction of the joint core (1) does not exceed the inner diameter of the inner resin tube of the anti-fatigue bionic rubber hose (2), and the compression amount of the transition slowing angle along the axial direction of the joint core (1) does not exceed 2% of the wall thickness of the inner resin tube of the anti-fatigue bionic rubber hose (2).
8. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: A covering sleeve is provided on the portion of the sleeve (3) that is separated from the anti-fatigue bionic rubber hose (2), and is used to contact the weatherproof layer after buckling to prevent the infiltration of rainwater, etc., and has the function of limiting the hard bite damage of the sleeve (3) directly to the anti-pullout reinforcement layer caused by excessive bending of the anti-fatigue bionic rubber hose (2).
9. The anti-bending and anti-fatigue hose according to claim 1, characterized in that: The inner wall of the sleeve (3) has a first connecting groove (10) that is engaged with the connecting ring (5) of the head section of the joint core (1); the side of the first connecting groove (10) of the sleeve (3) facing the hose has a plurality of protruding teeth along the axial direction of the sleeve (3); the number of the protruding teeth is no more than three, namely, a first protruding tooth (16), a second protruding tooth (17), and a third protruding tooth (18); The first protruding tooth (16), the second protruding tooth (17) and the third protruding tooth (18) are in a circular ring structure, or the first protruding tooth (16), the second protruding tooth (17) and the third protruding tooth (18) are in a threaded structure that is spirally connected to each other; The inner diameters of the first protruding teeth (16), the second protruding teeth (17) and the third protruding teeth (18) at one end away from the hook connection surface (20) where the sleeve (3) and the joint core (1) are connected gradually increase; or the inner diameters of the first protruding teeth (16), the second protruding teeth (17) and the third protruding teeth (18) at one end away from the hook connection surface (20) where the sleeve (3) and the joint core (1) are connected gradually increase, forming an open tapered thread structure.
10. The anti-bending and anti-fatigue hose according to claim 3, characterized in that: The second compression ring (13) corresponds to the first glue-containing groove (6); the third compression ring (15) corresponds to the second glue-containing groove (7), and is used to bend and deform the mouth end of the fatigue-resistant bionic rubber hose (2) after buckling, so as to seal and prevent the rubber hose from being pulled out from the joint core (1).