A steel wire reinforced hydraulic hose connection device and a connection method

Abstract

The present invention provides a steel wire reinforced hydraulic hose connection device and a connection method. It includes a sleeve and a core barrel. The sleeve is axially sleeved and fixed on the core barrel. A hydraulic hose is embedded between the sleeve and the core barrel. The hydraulic hose includes an inner rubber layer, a steel wire reinforcement layer, and an outer rubber layer. Claw teeth are provided on the inner wall surface of the sleeve. An inner cavity rotating surface for reducing stress concentration is connected at the last claw tooth of the sleeve. The curve equation of the inner cavity rotating surface in the section containing the axis of the sleeve is: ; The connection device of the present invention effectively reduces the stress concentration phenomenon of the steel wire reinforcement layer and the inner rubber layer, and greatly improves the reliability of the connection work of the device.

Description

Technical Field

[0001] The present invention belongs to the field of steel wire reinforced hydraulic hoses, and particularly relates to a connecting device and a connecting method for steel wire reinforced hydraulic hoses. Background Art

[0002] The steel wire reinforced hydraulic hose is one of the key components in the hydraulic system. It is connected to mechanical engineering through a connecting device, making the hose a channel for high-pressure fluid media in the mechanical equipment to transmit power and energy. Therefore, the connecting system of hydraulic hoses has been widely used in industrial fields such as construction machinery, petrochemical, coal mining, transportation, and aerospace technology. Practice shows that the fatigue resistance of the hydraulic hose connecting system is the most core factor in measuring the product quality of mechanical equipment. To improve the quality of domestic hydraulic hoses to the international first-class level, it is necessary to improve the connecting device and increase the number of pulse fatigue tests of the hydraulic hose connecting system. Summary of the Invention

[0003] The present invention provides a connecting device and a connecting method for steel wire reinforced hydraulic hoses.

[0004] The purpose of the present invention is achieved in the following way: It includes a sleeve and a core barrel. The sleeve is axially sleeved and fixed on the core barrel. A hydraulic hose is embedded between the sleeve and the core barrel. The hydraulic hose includes an inner rubber layer, a steel wire reinforcement layer, and an outer rubber layer. The inner wall surface of the sleeve is provided with buckles. At the last buckle of the sleeve, a cavity rotating surface for reducing stress concentration is connected. The curve equation of the cavity rotating surface in the section containing the axis of the sleeve is: ; where the origin is the connection point of the tooth top of the buckle in the section and the curve, that is, the starting point of the curve; the X-axis is parallel to the axis of the sleeve, and the positive direction is to the right of the last buckle; the Y-axis is perpendicular to the axis of the sleeve, and the positive direction is away from the axis of the sleeve.

[0005] The sleeve is axially provided with at least three buckles, and the tooth thickness on the left side of the buckle is higher than that on the right side.

[0006] The sleeve is provided with three buckles with the same tooth thickness from left to right. The diameter of the tooth top circle is ; the tooth thickness of the fourth buckle is less than that of the first three buckles, and the diameter of the tooth top circle is ; the tooth thickness of the fifth buckle is less than that of the fourth buckle and is connected to the cavity rotating surface. The diameter of the tooth top circle of its buckle is ; where is the outer diameter of the steel wire reinforcement layer; ∅ is the sleeve diameter crimping amount; ∆ is the maximum deformation amount of the steel wire reinforcement layer in the radial direction when the hydraulic hose bears load. The length unit of the above quantities is millimeter; the diameter of the tooth top circle is the diameter of the circle where the tooth top of the buckle is located.

[0007] When the core tube is inserted into the inner hole of the hydraulic hose, the outer diameter of the core tube is designed and processed based on the inner hole diameter of the hydraulic hose, and the core tube and the hydraulic hose form an H7 / s6 interference fit.

[0008] When the hydraulic hose is inserted into the inner hole of the sleeve, the outer diameter of the sleeve is designed and processed based on the outer diameter of the hydraulic hose, so that the sleeve and the hydraulic hose form a K7 / h6 transition fit.

[0009] The core barrel comprises an integrated head and a connecting part, wherein the connecting part is provided with a circumferential groove and a sealing section in sequence along the axial direction; a boss is provided radially at one end of the sleeve, and the boss is inserted into the circumferential groove of the core barrel.

[0010] The method comprises the following steps: (1) using a tube stripping machine to strip off the outer rubber layer of the connection end of the hydraulic hose and the equipment to expose the steel wire reinforcement layer; (2) completely inserting the steel wire reinforcement layer of the connection end of the hydraulic hose into the sleeve, and the matching relationship between the two is K7 / h6 transition fit; (3) completely inserting the core tube into the inner hole of the connection end of the hydraulic hose, and the matching relationship between the two is H7 / s6 interference fit; (4) applying a crimping displacement of 4.2-4.6 mm to the center of the axis in the circumferential direction of the sleeve by a crimping machine, so that the four buckling teeth in the sleeve and the steel wire reinforcement layer of the hydraulic hose come into contact with each other to produce a combined plastic deformation of compression and bending, so that a non-rebound toothed contact connection relationship is produced between the buckling teeth and the steel wire reinforcement layer; so that the hydraulic hose and the sleeve become an integral structure for transmitting hydraulic load; after the steel wire reinforcement layer of the hydraulic hose is subjected to the radial deformation generated by the hydraulic load, it comes into uniform contact with the fifth buckling tooth of the sleeve and the rotating surface of the inner cavity, thereby reducing the bending stress of the steel wire reinforcement layer and the inner rubber layer.

[0011] The beneficial effects of the present invention are as follows: the connection device of the present invention can be widely used in the connection of various types of steel wire reinforced hydraulic hoses with a diameter of 25 mm. Compared with the traditional connection device, when the steel wire reinforced layer of the hydraulic hose is subjected to radial deformation under the alternating pressure load in the lumen, its radial displacement deformation is limited by the fifth buckle tooth of the sleeve on an inner cavity rotating curved surface, so that its radial deformation is evenly distributed in the axial direction of the hydraulic hose, avoiding the bending stress concentration caused by excessive deflection deformation rate, effectively reducing the stress concentration phenomenon of the steel wire reinforced layer and the inner rubber layer, and greatly improving the reliability of the device connection. According to the technical specifications for type test experiments on hose products in the national standard, the minimum fatigue life of the device can reach 1.24 million times through fatigue tests, and the main landmark indicators have reached the expected design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the hydraulic hose connection device.

[0013] Figure 2 It is a schematic diagram of the sleeve.

[0014] Figure 3 It is an enlarged schematic view of the third, fourth, and fifth tooth-locking parts of the sleeve.

[0015] Figure 4 It is an embodiment of the core barrel.

[0016] Figure 5 It is a schematic view of the fifth tooth-locking of the sleeve, the inner cavity rotating surface, and the un-clamped state of the hydraulic hose.

[0017] Figure 6 It is Figure 5 Schematic view after clamping.

[0018] Among them, 1 is the core barrel, 11 is the head, 12 is the circumferential groove, 13 is the sealing section, 2 is the sleeve, 20 is the tooth-locking, 21 is the inner cavity rotating surface, 22 is the convex platform, 3 is the hydraulic hose, 30 is the outer rubber layer, 31 is the steel wire reinforcement layer, and 32 is the inner rubber layer. Specific implementation mode

[0019] The defect of the traditional hydraulic hose connection device is that: when the steel wire reinforcement layer 31 of the hydraulic hose 3 bears the pressure load, it will bend and deform, and the deformation amount increases with the increase of the pressure level, and stress concentration occurs at the position with the largest bending curvature. As the number of fatigue times of the alternating pressure load increases to a certain extent, generally after 300,000 - 400,000 times through a large number of experimental observations, an annular fatigue crack will appear in the inner rubber layer at the connection part of the hydraulic hose 3, and then liquid leakage will occur, resulting in the failure of the working state of the hydraulic hose 3.

[0020] Through computer simulation analysis of the clamping process and working process of the traditional hydraulic hose connection device, combined with the experiment on the failure mechanism of the hose material, it is determined that the reason for the liquid leakage phenomenon at the connection part of the hydraulic hose 3 is that the materials of the steel wire reinforcement layer 31 and the inner rubber layer 32 generate stress concentration under the pulsed fatigue working state, which leads to the generation and propagation evolution of cracks in the rubber material of the inner rubber layer 32, and finally the cracks in the rubber material of the inner rubber layer 32 penetrate and liquid leakage occurs. Computer simulation analysis and the material fatigue failure mechanism show that: reducing the stress value of the inner rubber layer material when bearing the load can significantly increase the number of times of material fatigue failure.

[0021] The following combines the attached drawings and specific embodiments to describe the technical solution of the invention in detail. It should be noted that the "connection" described in this application and the words used to express "connection", such as "connected", "linked", etc., include both the direct connection of one component to another component and the connection of one component to another component through other components.

[0022] Such as Figures 1-6As shown in the figure, a wire-reinforced hydraulic hose connection device includes a sleeve 2 and a core barrel 1. The sleeve 2 is axially sleeved and fixed on the core barrel 1. A hydraulic hose 3 is embedded between the sleeve 2 and the core barrel 1. The hydraulic hose 3 includes an inner rubber layer 32, a wire reinforcement layer 31, and an outer rubber layer 30. The inner wall surface of the sleeve 2 is provided with retaining teeth 20. At the last retaining tooth 20 of the sleeve 2, an inner cavity rotating surface 21 for reducing stress concentration is connected. The curve equation of the inner cavity rotating surface 21 in the plane containing the axis of the sleeve is: ; where the origin is the connection point of the tooth top line of the retaining tooth 20 on the section and the curve, that is, the starting point of the curve; the X-axis is parallel to the axis of the sleeve 2, and the positive direction is on the right side of the last retaining tooth 20; the Y-axis is perpendicular to the axis of the sleeve 2, and the positive direction is away from the axis of the sleeve 2. The tooth top of the retaining tooth 20 refers to the side of the retaining tooth 20 close to the axis of the sleeve 2. One end of the inner cavity rotating surface 21 is connected to the tooth top surface of the retaining tooth 20, and the other end extends obliquely upward away from the retaining tooth 20. The general extension direction is similar to a conical surface, but different from a common conical surface. The medium flowing in the hydraulic hose 3 is a high-pressure fluid. Since the power transmitted by most mechanical devices is an alternating pulse load, the velocity and acceleration of the medium flowing in the hydraulic hose 3 are relatively large and the change frequency is high, resulting in repeated expansion and contraction of the materials of the wire reinforcement layer 31 and the inner rubber layer 32 in the hydraulic hose 3. The traditional sleeve 2 only has the structure of the retaining tooth 20. The materials of the wire reinforcement layer 31 and the inner rubber layer 32 being buckled are subjected to alternating pressure loads, and the radial deflection deformation rate, that is, the degree of change of the deformation "suddenly changes", causes "concentrated" bending stress in the wire reinforcement layer 31 and the inner rubber layer 32 of the hydraulic hose. The long-term alternation of this concentrated bending stress leads to the fracture and failure of the connection device. By performing stress analysis on the connection device, the deformation amount function of the hydraulic hose 3 at the position of the last retaining tooth 20 is calculated, and thus the corresponding inner cavity rotating surface 21 is designed, effectively reducing the occurrence of stress concentration. The connection device of the present invention actively reduces the maximum stress value at the "fracture" part, thus overcoming the defect of the low reliability of the traditional joint connection device, greatly improving the working stability of the hose connection system, making the fatigue times reach more than 1.3 million times, exceeding the requirement of 1 million times of the fatigue times of the DC grade products specified in the international standard ISO18752-2014.

[0023] The sleeve 2 is axially provided with at least three retaining teeth 20, and the general trend of the thickness change of the retaining teeth 20 is that the left side is higher than the right side. In a specific embodiment, the sleeve 2 is provided with three retaining teeth 20 with the same tooth thickness from left to right, and the tooth top circle diameter is ; the tooth thickness of the fourth retaining tooth 20 is less than that of the first three retaining teeth 20, and the tooth top circle diameter is ; the tooth thickness of the fifth retaining tooth 20 is less than that of the fourth retaining tooth 20 and is connected to the inner cavity rotating surface 21, and the tooth top circle diameter of its retaining tooth 20 is ; where is the outer diameter of the steel wire reinforcement layer 31; ∅ is the diameter swaging amount of the sleeve 2; ∆ is the maximum radial deformation amount of the steel wire reinforcement layer 31 during loading, with the length unit being millimeters; the tip circle diameter is the diameter of the circle where the tips of the swaging teeth 20 are located. It should be noted that the terms "front", "rear", "left", "right", "upper", and "lower" used in the description refer to the directions in the attached drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0024] The shapes of the first three swaging teeth 20 are isosceles trapezoids, and this shape can ensure that the swaging teeth 20 generate an axial thrust on the steel wire reinforcement layer 31 of the hydraulic hose 3 during swaging, thereby avoiding the "retreat" phenomenon that occurs when the steel wire reinforcement layer 31 deforms during swaging. During swaging, after the swaging teeth 20 come into direct contact with the steel wire reinforcement layer 31 and undergo elastic-plastic deformation, a mutual locking phenomenon occurs, making the two connected into an integrated structure and transmitting the main bearing capacity between the hydraulic hose 3 and the sleeve 2. At the same time, since the diameter of the steel wire reinforcement layer 31 becomes smaller, it pushes the inner rubber layer 32 to fit the surface of the core cylinder 1, causing a concave-convex sealing ring to be formed on the inner surface of the inner rubber layer 32, which plays a role in sealing the hydraulic medium by the connecting device. The shape of the fourth swaging tooth 20 is similar to that of the first three swaging teeth 20, but the difference is that its height is lower than that of the first three swaging teeth 20. Due to the reduced height of the fourth swaging tooth 20, the swaging effect on the steel wire reinforcement layer 31 is reduced, resulting in a decrease in the thickness deformation amount of the inner rubber layer 32, avoiding the phenomenon of "separation between the inner rubber layer 32 and the steel wire reinforcement layer 31" that occurs in the traditional connection method of steel wire-reinforced hydraulic hoses due to the axial flow of the inner rubber layer 32 after swaging deformation, resulting in local thickening. This phenomenon is also the main reason for the leakage of the inner rubber layer 32 leading to fatigue failure. The cross-sections of the first 3 swaging teeth 20 are trapezoidal, and the specific shape can be a trapezoidal top width of 1 mm, a top height of 3 mm, a left hypotenuse width of 1 mm, and a right hypotenuse width of 2 mm; the height of the fourth swaging tooth tip is lower. The shape of the fifth swaging tooth 20 is similar to that of the first four swaging teeth 20, but the difference is that the height of the swaging tooth 20 is lower, and its cross-section is approximately trapezoidal, with a trapezoidal top width of 1 mm, a top height of 1.75 mm, a left hypotenuse width of 1 mm, and a right hypotenuse width of 6 mm. There is still a very small gap between the tip of the fifth swaging tooth 20 and the outer surface of the hose steel wire reinforcement layer 31 after swaging. After the hydraulic hose 3 is loaded, the diameter of the steel wire reinforcement layer 31 increases. At this time, after the tip of the fifth swaging tooth 20 comes into contact with the outer surface of the steel wire reinforcement layer 31, it restricts the deformation of the steel wire reinforcement layer 31, and this swaging tooth 20 restricts about 30% of the total diameter deformation amount of the steel wire reinforcement layer 31. The inner cavity rotating surface 21 connected to the fifth swaging tooth 20 also has gaps of different sizes with the outer surface of the steel wire reinforcement layer 31 after swaging, and the size of this gap value is determined by the curve equation of the inner cavity rotating surface 21. The equation is calculated based on the principles of material mechanics by solving the theoretical diameter deformation of the steel wire reinforcement layer when the hydraulic hose 3 bears pressure loads. Figure 5It is a schematic structural diagram when the rubber hose and the connecting device do not bear hydraulic load. Figure 6 As shown in the figure, after the hydraulic rubber hose 3 bears the load, the corresponding part of the steel wire reinforcement layer 31 and the inner cavity rotating surface 21 will also show an increase in diameter. The entire inner cavity rotating surface 21 comes into contact with the outer surface of the steel wire reinforcement layer 31. Since the shape of the surface coincides with the changed shape of the steel wire reinforcement layer 31, the constraint effect of the inner cavity rotating surface 21 on the steel wire reinforcement layer 31 is the same, reducing the maximum bending stress generated by the bending deformation of the steel wire reinforcement layer 31 and avoiding the "stress concentration" phenomenon that is prone to occur in the traditional connection method of the steel wire reinforced hydraulic rubber hose, which may lead to defects such as the fracture of the steel wire reinforcement layer and low fatigue times.

[0025] 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 based on the inner hole diameter of the hydraulic rubber hose 3, and the core barrel 1 and the hydraulic rubber hose 3 have an interference fit of H7 / s6. This reduces the flow deformation of the rubber material at the connection part of the inner rubber layer 32 of the hydraulic rubber hose 3 and the internal stress between the inner rubber layer 32 and the steel wire reinforcement layer 31 of the hydraulic rubber hose, and reduces the "peeling" phenomenon between the inner rubber layer 32 and the steel wire reinforcement layer 31 of the hydraulic rubber hose. When the hydraulic rubber hose 3 is inserted into the inner hole of the sleeve 2, the sleeve 2 is designed and processed based on the outer diameter of the hydraulic rubber hose 3, so that the sleeve 2 and the hydraulic rubber hose 3 have a transition fit of K7 / h6. This not only ensures the smooth connection and assembly of the hydraulic rubber hose 3, but also reduces the radial ineffective thread displacement required for the sleeve 2.

[0026] The core barrel 1 includes an integral head 11 and a connecting part. The connecting part is sequentially provided with a circumferential groove 12 and a sealing section 13 along the axial direction; a boss 22 is provided radially at one end of the sleeve 2, and the boss 22 is clamped into the circumferential groove 12 of the core barrel 1. The sleeve 2 is made of ordinary carbon steel. The steel wire reinforcement layer 31 is made of high-strength carbon steel. The core barrel 1 is made of high-carbon steel material, and the depth of the sealing groove provided on the outer surface of its sealing section 13 can be reduced to 0.3 mm, which can increase the elastic modulus of the core barrel 1 during crimping and reduce its radial deformation. After the rubber surface of the inner rubber layer 32 of the hydraulic rubber hose has an interference fit with the outer surface of the core barrel 1, it plays a sealing role to ensure that the hydraulic medium does not leak. After the outer surface of the steel wire reinforcement layer 31 of the hydraulic rubber hose 3 and the thread teeth 20 in the sleeve 2 are compressed and deformed, a fastening connection relationship is generated to transmit the axial load of the hose. A tapered hole is provided in the head 11 of the core barrel 1, and through flange fixation, a sealed fixed relationship is formed with the tapered head at the end of the mechanical equipment, enabling the hydraulic system to achieve the connection of the hydraulic pipeline and ensuring that the hydraulic medium such as hydraulic oil, water, gas, etc. circulates without leakage under high-pressure conditions, thereby transmitting power and energy.

[0027] A connection method for a steel wire reinforced hydraulic hose connection device, comprising the following steps: (1) using a tube stripping machine to strip off the outer rubber layer 30 of the connection end of the hydraulic hose 3 and the equipment to expose the steel wire reinforcement layer 31; (2) completely inserting the steel wire reinforcement layer 31 of the connection end of the hydraulic hose 3 into the sleeve 2, and the matching relationship between the two is a K7 / h6 transition fit; (3) completely inserting the core tube 1 into the inner hole of the connection end of the hydraulic hose 3, and the matching relationship between the two is an H7 / s6 interference fit; (4) using a crimping machine to tighten the sleeve 2 in the circumferential direction. A buckling displacement of 4.2-4.6 mm is applied to the center of the shaft, and the four buckle teeth 20 in the sleeve 2 and the steel wire reinforcement layer 31 of the hydraulic hose are brought into contact with each other, resulting in compression and bending plastic deformation, so that a non-rebound meshing contact connection relationship is generated between the buckle teeth 20 and the steel wire reinforcement layer 31; after the radial deformation caused by the pressure load, the steel wire reinforcement layer 31 of the hydraulic hose is uniformly contacted with the fifth buckle tooth 20 of the sleeve 2 and the inner cavity rotating curved surface 21, reducing the bending stress of the steel wire reinforcement layer 31 and the inner rubber layer 32. Among them, the stripping length of step (1) is determined according to actual needs. It can be 50 to 70 mm in the axial direction. In step (3), it is ensured that the core tube 1 does not fall off when it is suspended vertically; at the same time, the contact pressure between the inner rubber layer 32 and the core tube 1 causes the inner rubber layer 32 to flow and deform, filling the sealing groove on the surface of the core tube 1 to achieve a sealing effect. In step (4), the interface force generated by the meshing contact connection between the four buckling teeth 20 and the steel wire reinforcement layer 31 bears the axial deformation force generated by the pressure load on the hydraulic hose 3, thereby ensuring the connection strength.

[0028] The connection device of the present invention can be widely used in the connection of various types of steel wire reinforced hydraulic hoses with a diameter of 25 mm. Compared with the traditional connection device, the stress concentration phenomenon of the steel wire reinforcement layer 31 and the inner rubber layer 32 is reduced, and the reliability of the connection work of the device is greatly improved. According to the technical specifications for type test experiments on hose products in the national standard, the minimum fatigue life of the device can reach 1.24 million times through fatigue tests, and the main characteristic indicators have reached the expected design requirements.

[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Moreover, for ordinary technicians in this field, various changes, modifications, substitutions and variations of these embodiments without departing from the spirit of the principle of the present invention are within the scope of this specification. The invention content of the steel wire reinforced hydraulic hose connection device designed according to this principle and having the same structural features and used for other diameter specification series is also protected.

Claims

1. A steel wire reinforced hydraulic hose connection device, comprising a sleeve and a core barrel. The sleeve is axially sleeved and fixed on the core barrel, and a hydraulic hose is embedded between the sleeve and the core barrel. The hydraulic hose includes an inner rubber layer, a steel wire reinforcement layer, and an outer rubber layer; the inner wall surface of the sleeve is provided with locking teeth, and it is characterized in that: The last engaging tooth of the sleeve is connected to an inner cavity rotating surface that reduces stress concentration. The curve equation of the inner cavity rotating surface in the cross-section containing the axis of the sleeve is: ; Wherein the origin is the connection point between the tooth crest of the clamping tooth on the section and the curve, i.e., the starting point of the curve; the X-axis is parallel to the axis of the sleeve, and the positive direction is to the right of the last clamping tooth; the Y-axis is perpendicular to the axis of the sleeve, and the positive direction is away from the axis of the sleeve; the sleeve is provided with three clamping teeth with the same tooth thickness from left to right, and the diameter of the tooth crest circle is ; the tooth thickness of the fourth clamping tooth is less than that of the first three clamping teeth, and the diameter of the tooth crest circle is ; the tooth thickness of the fifth clamping tooth is less than that of the fourth clamping tooth and is connected to the inner cavity rotating surface, and the diameter of the tooth crest circle of the clamping tooth is ; wherein is the outer diameter of the wire reinforcement layer; ∅ is the diameter crimping amount of the sleeve; ∆ is the maximum deformation amount in the radial direction of the wire reinforcement layer when the hydraulic hose bears load, and the length unit of each of the above quantities is millimeter; the diameter of the tooth crest circle is the diameter of the circle where the tooth crest of the clamping tooth is located.

2. The wire-reinforced hydraulic hose connection device according to claim 1, characterized in that: When the core barrel is inserted into the inner hole of the hydraulic hose, the outer diameter of the core barrel is designed and processed based on the inner diameter of the hydraulic hose, and the core barrel and the hydraulic hose are in an interference fit of H7 / s6.

3. The wire-reinforced hydraulic hose connection device according to claim 1, characterized in that: When the hydraulic hose is inserted into the inner hole of the sleeve, the outer diameter of the sleeve is designed and processed based on the outer diameter of the hydraulic hose, so that the sleeve and the hydraulic hose are in a transition fit of K7 / h6.

4. The wire-reinforced hydraulic hose connection device according to claim 1, wherein: The core barrel includes an integral head and a connecting part. The connecting part is sequentially provided with a circumferential groove and a sealing section along the axial direction; a boss is arranged radially at one end of the sleeve, and the boss is clamped into the circumferential groove of the core barrel.

5. The connection method of a wire-reinforced hydraulic hose connection device according to claim 1, characterized in that: It includes the following steps: (1) Use a tube peeling machine to peel off the outer rubber layer at the connection end of the hydraulic hose and the equipment to expose the steel wire reinforcement layer; (2) Completely insert the steel wire reinforcement layer at the connection end of the hydraulic hose into the sleeve, and their mating relationship is a transition fit of K7 / h6; (3) Completely insert the core barrel into the inner hole of the connection end of the hydraulic hose, and their mating relationship is an interference fit of H7 / s6; (4) Apply a crimping displacement of 4.2 - 4.6 mm to the center of the axis in the circumferential direction of the sleeve through a crimping machine, so that the four crimping teeth in the sleeve and the steel wire reinforcement layer of the hydraulic hose come into contact with each other and generate a combined plastic deformation of compression and bending, so that an irreversible meshing contact connection relationship is generated between the crimping teeth and the steel wire reinforcement layer; make the hydraulic hose and the sleeve become an integral structure for transmitting hydraulic load; after the steel wire reinforcement layer of the hydraulic hose bears the hydraulic load and generates radial deformation, it comes into uniform contact with the fifth crimping tooth and the inner cavity rotating surface of the sleeve, reducing the bending stress of the steel wire reinforcement layer and the inner rubber layer.

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