CN211693924U

CN211693924U - Steel wire reinforced hydraulic rubber pipe connecting device

Info

Publication number: CN211693924U
Application number: CN201922403894.XU
Authority: CN
Inventors: 吴振亭; 闫科; 王子兴; 张富宣; 母春雷; 鲍威; 庞付林
Original assignee: Henan Yibo Technology Co ltd
Current assignee: Henan Yibo Technology Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-10-16
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a steel wire reinforcing hydraulic pressure rubber tube connecting device. The hydraulic rubber hose comprises an inner rubber layer, a steel wire reinforcing layer and an outer rubber layer; the surface of the inner wall of the sleeve is provided with a thread, the last thread of the sleeve is connected with an inner cavity rotating curved surface for reducing stress concentration, and the curve equation of the inner cavity rotating curved surface on the section containing the axis of the sleeve is as follows:

(ii) a The utility model discloses a linkThe connecting device effectively reduces the stress concentration phenomenon of the steel wire reinforcing layer and the inner rubber layer, and greatly improves the reliability of the connecting work of the device.

Description

Steel wire reinforced hydraulic rubber pipe connecting device

Technical Field

The utility model belongs to steel wire reinforcing hydraulic pressure rubber tube field, concretely relates to steel wire reinforcing hydraulic pressure rubber tube connecting device.

Background

The steel wire reinforced hydraulic rubber pipe is one of the key parts in hydraulic system and is connected with mechanical engineering via a connecting device to make the rubber pipe become the passage for high pressure fluid medium in mechanical equipment for power and energy transmission. Practice shows that: the fatigue resistance of the hydraulic rubber pipe connecting system is the most core factor for measuring the quality of mechanical equipment products, the pulse fatigue test frequency of the steel wire reinforced hydraulic rubber pipe is required to exceed 50 ten thousand times in the national standard GB/T10544-2013, and the pulse fatigue test frequency is required to exceed 100 ten thousand times in the international standard ISO 18752-2014.4448. In order to improve the quality of domestic hydraulic rubber pipes to the international first-class level, a connecting device needs to be improved, and the pulse fatigue test frequency of a hydraulic rubber pipe connecting system needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a steel wire reinforcing hydraulic pressure rubber tube connecting device.

The purpose of the utility model is realized with the following mode: the hydraulic rubber hose comprises an inner rubber layer, a steel wire reinforcing layer and an outer rubber layer; the surface of the inner wall of the sleeve is provided with a thread, the last thread of the sleeve is connected with an inner cavity rotating curved surface for reducing stress concentration, and the curve equation of the inner cavity rotating curved surface on the section containing the axis of the sleeve is as follows:

(ii) a It is composed ofThe middle origin point is a connection point of the crest of the tooth on the section and the curve, namely a starting point of the curve; the X axis is parallel to the axis of the sleeve, and the positive direction is the right side of the last button tooth; the Y-axis is perpendicular to the sleeve axis and the forward direction is the direction away from the sleeve axis.

The sleeve is provided with at least three buckling teeth along the axial direction, and the left side of the thickness of the buckling teeth is higher than the right side.

The sleeve is provided with three buttons with the same tooth thickness from left to right, and the diameter of the top circle of each button is

(ii) a The thickness of the fourth tooth is less than that of the first three teeth, and the diameter of the crest circle is

(ii) a The thickness of the fifth tooth is less than that of the fourth tooth and is connected with the inner cavity rotating curved surface, and the diameter of the crest circle of the tooth is

(ii) a Wherein

The outer diameter of the steel wire reinforcement layer; ∅ is the sleeve diameter buckling amount; the maximum deformation amount in the radius direction of the steel wire reinforcing layer when the hydraulic rubber tube bears is the maximum, and the length unit of each amount is millimeter; the diameter of the crest circle is the diameter of the circle where the crest of the tooth is located.

When the core barrel is inserted into the inner hole of the hydraulic rubber hose, the outer diameter of the core barrel is designed and processed by taking the diameter of the inner hole of the hydraulic rubber hose as a reference, and the core barrel and the hydraulic rubber hose are in interference fit H7/s 6.

When the hydraulic rubber tube is inserted into the inner hole of the sleeve, the outer diameter of the sleeve is designed and processed by taking the outer diameter of the hydraulic rubber tube as a reference, so that the sleeve and the hydraulic rubber tube are in K7/h6 transition fit.

The core barrel comprises an integrated head part and a connecting part, and the connecting part is sequentially provided with a circumferential groove and a sealing section along the axial direction; one end of the sleeve is provided with a boss along the radial direction, and the boss is clamped in the circumferential groove of the core barrel.

The utility model has the advantages that: the utility model discloses a connecting device can be widely applied to the connection that each type diameter specification is 25 mm's steel wire reinforcing hydraulic hose, compare with traditional connecting device, when the hydraulic hose steel wire enhancement layer that is withheld takes place radial deformation bearing the alternating pressure load of lumen, its radial displacement is out of shape by telescopic fifth knot tooth restriction on an inner chamber rotating surface, thereby make its radial deflection be evenly distributed at hydraulic hose axial direction, it causes bending stress to concentrate to have avoided the amount of deflection deformation rate too big, the stress concentration phenomenon of steel wire enhancement layer and interior glue film has been reduced effectively, the reliability of device connection work has greatly been improved. According to the technical specification of the type test experiment of the rubber tube products in the national standard, the minimum fatigue life of the device can reach 124 ten thousand times measured by a fatigue experiment, and the performance index reaches the requirement of the international standard.

Drawings

Fig. 1 is a schematic view of a hydraulic hose connection device.

Fig. 2 is a schematic view of a sleeve.

Fig. 3 is an enlarged schematic view of the third, fourth and fifth tooth parts of the sleeve.

FIG. 4 is an embodiment of a cartridge.

FIG. 5 is a schematic view of a fifth thread of the sleeve, a rotating curved surface of the inner cavity and a hydraulic rubber hose in an unclamped state.

Fig. 6 is a schematic view of fig. 5 after crimping.

Wherein, 1 is a core cylinder, 11 is a head, 12 is a circumferential groove, 13 is a sealing section, 2 is a sleeve, 20 is a button tooth, 21 is an inner cavity rotating curved surface, 22 is a boss, 3 is a hydraulic rubber pipe, 30 is an outer rubber layer, 31 is a steel wire reinforcing layer, and 32 is an inner rubber layer.

Detailed Description

The traditional hydraulic rubber pipe connecting device has the defects that: the steel wire reinforcing layer 31 of the hydraulic hose 3 is subjected to bending deformation when receiving a pressure load, and the amount of deformation increases with an increase in the pressure level, and a stress concentration phenomenon occurs at a portion having the largest bending curvature. As the fatigue times of the alternating pressure load are increased to a certain degree, the inner rubber layer at the connecting part of the hydraulic rubber tube 3 has annular fatigue cracks and then has liquid leakage phenomenon after being observed by a large number of experiments and generally 30-40 ten thousand times, so that the working state of the hydraulic rubber tube 3 is failed.

By carrying out computer simulation analysis on the buckling process and the working process of the traditional hydraulic rubber pipe connecting device and combining with an experiment of a rubber pipe material failure mechanism, the reason that the liquid leakage phenomenon occurs at the connecting part of the hydraulic rubber pipe 3 is determined to be that the materials of the steel wire reinforcing layer 31 and the inner rubber layer 32 generate a stress concentration phenomenon under a pulse fatigue working state, so that the generation and the propagation evolution of cracks on the rubber material of the inner rubber layer 32 are caused, and finally, the liquid leakage phenomenon occurs when the cracks on the rubber material of the inner rubber layer 32 penetrate through the rubber material of the inner rubber layer. Computer simulation analysis and material fatigue failure mechanism show that: the stress value of the inner rubber layer material when bearing load is reduced, and the fatigue failure times of the material can be obviously improved.

The technical solution of the invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that "connected" and words used in this application to express "connected," such as "connected," "connected," and the like, include both direct connection of one element to another element and connection of one element to another element through another element.

As shown in fig. 1-6, a steel wire reinforced hydraulic rubber hose connecting device comprises a sleeve 2 and a core barrel 1, wherein the sleeve 2 is sleeved and fixed on the core barrel 1 along the axial direction, a hydraulic rubber hose 3 is embedded between the sleeve 2 and the core barrel 1, and the hydraulic rubber hose 3 comprises an inner rubber layer 32, a steel wire reinforcing layer 31 and an outer rubber layer 30. The inner wall surface of the sleeve 2 is provided with a thread 20. The last tooth 20 of the sleeve 2 is connected with an inner cavity rotating curved surface 21 for reducing stress concentration, and the curve equation of the inner cavity rotating curved surface 21 on a plane containing the sleeve axis is as follows:

(ii) a Wherein the origin point is the connection point of the crest line of the tooth 20 and the curve on the section, namely the starting point of the curve; the X axis is parallel to the axis of the sleeve 2, and the positive direction is the right side of the last button tooth 20; the Y axis is perpendicular to the axis of the sleeve 2, and the positive direction is the direction away from the axis of the sleeve 2. The crest of the tooth 20 refers to a surface of the tooth 20 close to the axis of the sleeve 2. One end of the inner cavity rotating curved surface 21 is connected with the top surface of the tooth 20, and the other end is far away from the toothThe teeth 20 extend obliquely upwards, generally in a direction similar to the cone, but different from the normal cone. The medium flowing in the hydraulic rubber tube 3 is a high-pressure fluid, and the power transmitted by most mechanical devices is an alternating pulse load, so that the flowing speed and the flowing acceleration of the medium in the hydraulic rubber tube 3 are both large and the change frequency is high, and the expansion and contraction phenomena of the steel wire reinforcing layer 31 and the inner rubber layer 32 materials in the hydraulic rubber tube 3 occur repeatedly along with the pulse load. The traditional sleeve 2 only has a thread 20 structure, the materials of the buckled steel wire reinforcing layer 31 and the inner rubber layer 32 bear alternating pressure load, the radial deflection deformation rate of the traditional sleeve is the 'sudden change' of the deformation change degree, so that the steel wire reinforcing layer 31 and the inner rubber layer 32 of the hydraulic rubber pipe generate 'concentrated' bending stress, and the concentrated bending stress is subjected to long-time alternating to cause the fracture and failure of a connecting device. Through carrying out stress analysis on the connecting device, the deformation function of the hydraulic rubber tube 3 at the position of the last thread 20 is calculated, so that the inner cavity rotating curved surface 21 corresponding to the deformation function is designed, and the stress concentration phenomenon is effectively reduced. The connecting device actively reduces the maximum stress value of the 'broken' part, thereby overcoming the defect of lower reliability of the traditional joint connecting device, greatly improving the working stability of a rubber tube connecting system, and ensuring that the fatigue frequency reaches more than 130 ten thousand times and exceeds the requirement of 100 ten thousand times of fatigue frequency of DC-grade products specified in international standard ISO18752-2014.

The sleeve 2 is provided with at least three threading teeth 20 in the axial direction, and the thickness of the threading teeth 20 generally tends to change higher on the left than on the right. In the specific embodiment, the sleeve 2 is provided with three fastening teeth 20 with the same tooth thickness from left to right, and the diameter of the crest circle is

(ii) a The thickness of the fourth tooth 20 is smaller than that of the first three teeth 20, and the diameter of the crest circle is

(ii) a The thickness of the fifth tooth 20 is smaller than that of the fourth tooth 20 and is connected with the inner cavity rotating curved surface 21, and the diameter of the crest circle of the tooth 20 is

(ii) a Wherein

The outer diameter of the steel wire reinforced layer 31; ∅ is the diameter buckling amount of the sleeve 2; the maximum radius deformation when the steel wire reinforcing layer 31 bears the load is the maximum radius deformation, and the length unit is millimeter; the crest circle diameter is the diameter of the circle on which the crest of the button 20 lies. It should be noted that as used in the description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The first three buckling teeth 20 are in unequal waist trapezoid shapes, and the shapes can ensure that the buckling teeth 20 generate axial thrust on the steel wire reinforcing layer 31 of the hydraulic rubber hose 3 during buckling, so that the phenomenon of 'retreating' when the steel wire reinforcing layer 31 deforms during buckling is avoided. When the hydraulic rubber hose is buckled, the buckling teeth 20 and the steel wire reinforcing layer 31 are directly contacted, and then generate the phenomenon of mutual locking after elastic-plastic deformation, so that the buckling teeth and the steel wire reinforcing layer are connected into an integrated structure, and the main bearing capacity between the hydraulic rubber hose 3 and the sleeve 2 is transferred. Meanwhile, after the diameter of the steel wire reinforcing layer 31 is reduced, the inner rubber layer 32 is pushed to be attached to the surface of the core barrel 1, so that a concave-convex sealing ring is generated on the inner surface of the inner rubber layer 32, and the sealing effect of the connecting device on a hydraulic medium is achieved. The fourth tooth 20 is shaped similarly to the first three teeth 20 except that it is lower in height than the first three teeth 20. The fourth thread 20 reduces the buckling action on the steel wire reinforcing layer 31 due to the reduction of the height, so that the thickness deformation of the inner rubber layer 32 is reduced, and the phenomenon that the inner rubber layer 32 is separated from the steel wire reinforcing layer 31 due to local thickening caused by axial flow generated after buckling deformation of the inner rubber layer 32 in the traditional connection method of the steel wire reinforced hydraulic rubber pipe is avoided. This phenomenon is also the primary cause of fatigue failure due to leakage of the inner gum layer 32. The cross section of the front 3 fastening teeth 20 is trapezoidal, and the specific shape can be that the top width of the trapezoid is 1mm, the top height is 3mm, the width of the left bevel edge is 1mm, and the width of the right bevel edge is 2 mm; the height of the top of the fourth tooth is lower. The shape of the fifth button tooth 20 is similar to that of the first four button teeth 20, and the difference is that the height of the button tooth 20 is lower, the cross section of the button tooth is approximately trapezoidal, the width of the top of the trapezoid is 1mm, the height of the top of the trapezoid is 1.75mm, the width of the left inclined edge is 1mm, and the width of the right inclined edge is 6 mm. After the crest of the fifth tooth 20 is buckled, a small gap still exists between the crest of the fifth tooth and the outer surface of the steel wire reinforcing layer 31 of the rubber hose, the diameter of the steel wire reinforcing layer 31 is increased after the hydraulic rubber hose 3 bears the load, at the moment, the deformation of the steel wire reinforcing layer 31 is restrained after the contact pressure is generated between the crest of the fifth tooth 20 and the outer surface of the steel wire reinforcing layer 31, and the tooth 20 limits about 30% of the total deformation of the diameter of the steel wire reinforcing layer 31. The inner cavity rotating curved surface 21 connected with the fifth tooth 20 has a gap with different size with the outer surface of the steel wire reinforced layer 31 after being buckled, and the size of the gap value is determined by the curve equation of the inner cavity rotating curved surface 21. The equation is calculated by solving the diameter deformation theory of the steel wire reinforced layer when the hydraulic rubber hose 3 bears the pressure load according to the principle of material mechanics. FIG. 5 is a schematic view of the hose and connection arrangement when not under hydraulic load. Fig. 6 shows that the diameter of the corresponding part of the steel wire reinforcement layer 31 and the inner cavity rotating curved surface 21 is also increased after the hydraulic hose 3 is loaded, the inner cavity rotating curved surface 21 is in contact with the outer surface of the steel wire reinforcement layer 31, and the shape of the curved surface is identical to the shape of the steel wire reinforcement layer 31, so that the restriction action of the inner cavity rotating curved surface 21 on the steel wire reinforcement layer 31 is the same, the maximum bending stress generated by the bending deformation of the steel wire reinforcement layer 31 is reduced, and the defects of low steel wire reinforcement layer fracture and fatigue times and the like caused by the stress concentration phenomenon easily generated in the traditional connection method of the steel wire reinforced hydraulic hose are avoided.

When the core barrel 1 is inserted into the inner hole of the hydraulic rubber hose 3, the core barrel 1 is designed and processed by taking the diameter of the inner hole of the hydraulic rubber hose 3 as a reference, and the core barrel 1 and the hydraulic rubber hose 3 are in interference fit H7/s 6. The flowing deformation of the rubber material at the connecting part of the inner rubber layer 32 of the hydraulic rubber tube 3 and the internal stress between the inner rubber layer 32 of the hydraulic rubber tube and the steel wire reinforcing layer 31 are reduced, and the phenomenon of 'peeling' between the inner rubber layer 32 of the hydraulic rubber tube and the steel wire reinforcing layer 31 is reduced. When the hydraulic rubber tube 3 is inserted into the inner hole of the sleeve 2, the sleeve 2 is designed and processed by taking the outer diameter of the hydraulic rubber tube 3 as a reference, so that the sleeve 2 and the hydraulic rubber tube 3 are in K7/h6 transition fit. The smooth connection and assembly of the hydraulic rubber pipe 3 are ensured, and the radial ineffective threading displacement required by the sleeve 2 is reduced.

The core barrel 1 comprises an integrated head 11 and a connecting part, and the connecting part is sequentially provided with a circumferential groove 12 and a sealing section 13 along the axial direction; a boss 22 is radially arranged at one end of the sleeve 2, and the boss 22 is clamped in the circumferential groove 12 of the core barrel 1. The sleeve 2 is made of common carbon steel. The steel wire reinforcement layer 31 is high strength carbon steel. The core barrel 1 is made of high-carbon steel, the depth of a sealing groove formed in the outer surface of the sealing section 13 of the core barrel can be reduced to 0.3mm, the elastic modulus of the core barrel 1 in buckling is improved, and the deformation of the core barrel in the radial direction is reduced. The rubber surface of the inner rubber layer 32 of the hydraulic rubber hose and the outer surface of the core barrel 1 are in interference fit to play a role in sealing, so that the hydraulic medium is prevented from leaking. The outer surface of the steel wire reinforcing layer 31 of the hydraulic rubber hose 3 and the thread 20 in the sleeve 2 are compressed and deformed to generate a fastening connection relationship, so that the axial load of the rubber hose is transmitted. The head 11 of the core barrel 1 is provided with a taper hole, a sealing fixed relation is formed between the taper hole and a mechanical equipment end taper head through flange fixing, a hydraulic system realizes hydraulic pipeline communication, and hydraulic media such as hydraulic oil, water, gas and the like can circularly flow under a high-pressure condition without leakage, so that power and energy are transmitted.

A connecting method of a steel wire reinforced hydraulic rubber pipe connecting device comprises the following steps: (1) stripping the leaked steel wire reinforcing layer 31 from the outer rubber layer 30 at the connecting end of the hydraulic rubber hose 3 and the equipment by using a pipe stripping machine; (2) the steel wire reinforcing layer 31 at the connecting end of the hydraulic rubber hose 3 is completely inserted into the sleeve 2, and the matching relationship of the steel wire reinforcing layer and the sleeve is K7/h6 transition matching; (3) the core barrel 1 is completely inserted into an inner hole of the connecting end of the hydraulic rubber tube 3, and the matching relationship of the core barrel and the inner hole is H7/s6 interference fit; (4) applying 4.2-4.6 mm buckling displacement to the axial center in the circumferential direction of the sleeve 2 through a buckling press, and enabling four buckling teeth 20 in the sleeve 2 and a hydraulic rubber hose steel wire reinforcing layer 31 to be in mutual contact and then to generate compression and bending plastic deformation, so that an irreversible meshed contact connection relation is generated between the buckling teeth 20 and the steel wire reinforcing layer 31; the hydraulic rubber hose steel wire reinforcing layer 31 is uniformly contacted with the fifth thread 20 of the sleeve 2 and the inner cavity rotating curved surface 21 after bearing radial deformation generated by pressure load, so that the bending stress of the steel wire reinforcing layer 31 and the inner rubber layer 32 is reduced. Wherein, the glue stripping length in the step (1) is determined according to actual needs. And may be 50 to 70mm axially. In the step (3), the core barrel 1 is ensured not to fall off when being vertically hung; meanwhile, contact pressure is generated between the inner rubber layer 32 and the core barrel 1, so that the inner rubber layer 32 is subjected to flow deformation, and the surface sealing groove of the core barrel 1 is filled to achieve a sealing effect. The interfacial force generated by the meshing contact connection relationship between the four buckles 20 and the steel wire reinforcing layer 31 in the step (4) bears the axial deformation force generated by the pressure load borne by the hydraulic rubber hose 3, so that the connection strength is ensured.

The utility model discloses a connecting device can be widely applied to the connection that each type diameter specification is 25 mm's steel wire reinforcing hydraulic pressure rubber tube, compares with traditional connecting device, has reduced the stress concentration phenomenon of steel wire enhancement layer 31 and interior glue film 32, has greatly improved the reliability of device connection work. According to the technical specification of the type test experiment of the rubber tube product in the national standard, the minimum fatigue life of the device measured by the fatigue experiment can reach 124 ten thousand times, and the main index of the mark reaches the expected design requirement.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. Also, it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the spirit of the principles of the invention. The steel wire reinforced hydraulic rubber pipe connecting device is designed according to the principle, has the same structural characteristics, and is protected as well as the invention content of the steel wire reinforced hydraulic rubber pipe connecting device used for other diameter specification series.

Claims

1. A steel wire reinforced hydraulic rubber pipe connecting device comprises a sleeve and a core barrel, wherein the sleeve is sleeved and fixed on the core barrel along the axial direction, a hydraulic rubber pipe is embedded between the sleeve and the core barrel, and the hydraulic rubber pipe comprises an inner rubber layer, a steel wire reinforcing layer and an outer rubber layer; the surface of the inner wall of the sleeve is provided with a button tooth, which is characterized in that: the last tooth of the sleeve is connected with the inner part for reducing stress concentrationThe curve equation of the cavity rotating curved surface on the section containing the sleeve axis is as follows:

(ii) a Wherein the origin point is the connection point of the crest of the tooth on the section and the curve, namely the starting point of the curve; the X axis is parallel to the axis of the sleeve, and the positive direction is the right side of the last button tooth; the Y-axis is perpendicular to the sleeve axis and the forward direction is the direction away from the sleeve axis.

2. The steel wire reinforced hydraulic hose connecting device according to claim 1, wherein: the sleeve is provided with at least three buckling teeth along the axial direction, and the left side of the thickness of the buckling teeth is higher than the right side.

3. The steel wire reinforced hydraulic hose connecting device according to claim 2, wherein: the sleeve is provided with three buttons with the same tooth thickness from left to right, and the diameter of the top circle of each button is

(ii) a Wherein

4. The steel wire reinforced hydraulic hose connecting device according to any one of claims 1 to 3, wherein: when the core barrel is inserted into the inner hole of the hydraulic rubber hose, the outer diameter of the core barrel is designed and processed by taking the diameter of the inner hole of the hydraulic rubber hose as a reference, and the core barrel and the hydraulic rubber hose are in interference fit H7/s 6.

5. The steel wire reinforced hydraulic hose connecting device according to any one of claims 1 to 3, wherein: when the hydraulic rubber tube is inserted into the inner hole of the sleeve, the outer diameter of the sleeve is designed and processed by taking the outer diameter of the hydraulic rubber tube as a reference, so that the sleeve and the hydraulic rubber tube are in K7/h6 transition fit.

6. The steel wire reinforced hydraulic hose connecting device according to any one of claims 1 to 3, wherein: the core barrel comprises an integrated head part and a connecting part, and the connecting part is sequentially provided with a circumferential groove and a sealing section along the axial direction; one end of the sleeve is provided with a boss along the radial direction, and the boss is clamped in the circumferential groove of the core barrel.