A high-pressure hose joint and its installation method

Abstract

The present invention provides a high-pressure hose joint, which comprises a hexagonal nut, a joint core and an outer sleeve. The hexagonal nut is provided with an internal thread structure and a stepped hole; the left end of the joint core is successively provided with a lug, a first matching part and a second matching part. The outer diameter of the lug is larger than that of the first matching part, the outer diameter of the first matching part is larger than that of the second matching part, and a first groove is arranged on the outer wall of the second matching part; the outer sleeve comprises an outer sleeve body and a hexagonal shaft section, and a transition groove is arranged between the hexagonal shaft section and the outer sleeve body; the joint core penetrates through the hexagonal nut and the outer sleeve, the lug is arranged in the hexagonal nut, and a gap is left between the outer wall of the first matching part and the inner wall of the small-diameter section of the stepped hole; a locking groove is arranged at the matching position of the transition groove and the first groove, and the locking groove locks the joint core and the outer sleeve. The high-pressure hose joint of the present invention has a simple structure, a simple process, is convenient and fast to install, has a low manufacturing cost, and can effectively prevent the joint core from rotating.

Description

Technical Field

[0001] The invention relates to a pipe joint, in particular to a high-pressure hose joint and a mounting method thereof. Background Art

[0002] A pipe joint is a part that connects pipes in a hydraulic system or installs pipes on hydraulic components. It is a general term for connectors that can be installed and removed in a fluid passage. A high-pressure hose joint is one type of pipe joint. Currently, there are two types of high-pressure hose joints on the market: Figure 6 The high-pressure hose connector consists of a four-piece set. The connector and the transition sleeve must be pressed once, and then pressed again with the outer sleeve to complete the assembly. The disadvantage of this structure is that the number of pressings is one more, and they are all pressed through the groove. This structure is easy to cause the connector to rotate when using a wrench to turn the hexagonal nut. The use of the transition sleeve invisibly increases the cost; the second type, refer to Figure 7 The high-pressure hose connector consists of a three-piece set. The connector core is made of hexagonal material. This structure will waste a lot of materials when processing the connector core. Because the connector core is hexagonal, the nut cannot be a sleeve type. A snap-on nut is required, which needs to be snapped again to connect to the connector core. Because the connection position of the snap-on nut is buckled and pressed, the bottom of the nut will be deformed and uneven, which will affect the torque. Summary of the invention

[0003] [1] Technical issues to be solved

[0004] The technical problem to be solved by the present invention is to provide a high-pressure hose connector with a simple structure, simple process, convenient and quick installation, low manufacturing cost and the ability to effectively prevent the connector core from rotating.

[0005] 【2】Technical solutions to solve the problem

[0006] The present invention provides a high-pressure hose connector, which comprises a hexagonal nut, a connector core and a sleeve, wherein the hexagonal nut is provided with a coaxially arranged internal thread structure and a step hole; a hook, a first matching portion and a second matching portion are provided in sequence at the left end portion of the connector core, wherein the outer diameter of the hook is greater than the outer diameter of the first matching portion, the outer diameter of the first matching portion is greater than the outer diameter of the second matching portion, and a first groove is provided on the outer wall of the second matching portion; the sleeve comprises a sleeve body and a hexagonal shaft section, wherein a transition groove is provided between the hexagonal shaft section and the sleeve body; the connector core passes through the hexagonal nut and the sleeve, the hook is provided in the hexagonal nut, and a gap is left between the outer wall of the first matching portion and the inner wall of the small-diameter section of the step hole; a locking groove is provided at the matching position between the transition groove and the first groove, and the locking groove locks the connector core and the sleeve.

[0007] Furthermore, the length of the first mating portion is greater than the length of the small-diameter section of the stepped hole, and the difference between the two is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

[0008] Furthermore, the clearance is greater than or equal to 0.2 mm and less than or equal to 0.4 mm.

[0009] Furthermore, the bottom surface of the first groove is a tooth surface, there are four or eight first grooves, and each first groove corresponds to one locking groove.

[0010] Furthermore, the maximum depth of the first groove is greater than or equal to 1 mm and less than or equal to 2 mm.

[0011] Furthermore, the hexagon nut is a sleeve nut.

[0012] An installation method for a high-pressure hose joint includes the following steps:

[0013] a. Preparation work: Determine the number and maximum depth of the first grooves according to the outer diameter of the joint core;

[0014] b. Turning and machining: On the basis of a, the first grooves are sequentially machined to the dimensional requirements by a numerical control machine tool;

[0015] c. Assembly: First step, install the outer sleeve on the fixed seat of the swaging machine with the hexagonal shaft section facing up; Second step, place the hexagon nut on the outer sleeve with the stepped hole facing down; Third step, place the joint core inside the hexagon nut and the outer sleeve, and use a copper bar to tap the joint core to ensure that the lower end surface of the lug is completely mated with the stepped surface of the stepped hole; Fourth step, process the locking grooves through the swaging machine;

[0016] d. Self-inspection: On the basis of c, self-inspect the assembled high-pressure hose joint. Rotate the hexagon nut to see if the joint core rotates together. If the joint core rotates together with the hexagon nut, the assembled product is unqualified. If the joint core does not rotate together with the hexagon nut, the assembled product is qualified.

[0017] Furthermore, in step c, four or eight locking grooves are formed at one time.

[0018] 【3】Beneficial effects

[0019] The high-pressure hose joint of the present invention has a simple structure, simple processes, convenient and fast installation, low manufacturing cost, and can effectively prevent the joint core from rotating. Description of the drawings

[0020] Figure 1 is a schematic structural diagram of the high-pressure hose joint of the present invention;

[0021] Figure 2 Schematic diagram of the structure of the hexagonal nut of the high-pressure hose joint of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the outer sleeve in the high-pressure hose joint of the present invention;

[0023] Figure 4 Schematic diagram of the structure of the joint core in the high-pressure hose joint of the present invention;

[0024] Figure 5 Figure 4 Cross-sectional view of part A;

[0025] Figure 6 Schematic diagram of the structure of a high-pressure hose joint in the prior art;

[0026] Figure 7 Schematic diagram of the structure of another high-pressure hose joint in the prior art. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Referring to Figures 1 to 5 , the present invention provides a high-pressure hose joint, which includes a hexagonal nut 1, a joint core 2 and an outer sleeve 3. An internally threaded structure 11 and a stepped hole 12 are coaxially arranged in the hexagonal nut 1. The internally threaded structure 11 is connected to the stepped hole 12, and the bottom diameter of the internally threaded structure 11 is equal to the large diameter of the stepped hole 12. In this embodiment, the hexagonal nut 1 is a sleeve nut, and the use of a sleeve nut can reduce one-time crimping; the left end of the joint core 2 is sequentially provided with a coaxial ear, a first mating part 21 and a second mating part 22. The joint core 2 also includes a connecting part for connecting a high-pressure hose. The outer diameter of the ear is greater than the outer diameter of the first mating part 21, and the outer diameter of the first mating part 21 is greater than the outer diameter of the second mating part 22. A first groove 23 is provided on the outer wall of the second mating part 22; the outer sleeve 3 includes an outer sleeve body and a hexagonal shaft section 31, and a transition groove 32 is provided between the hexagonal shaft section 31 and the outer sleeve body; the joint core 2 passes through the hexagonal nut 1 and the outer sleeve 3, the ear is arranged in the hexagonal nut 1, and a gap is left between the outer wall of the first mating part 21 and the inner wall of the small-diameter section of the stepped hole 12; a locking groove 33 is provided at the mating part of the transition groove 32 and the first groove 23, and the locking groove 33 locks the joint core 2 and the outer sleeve 3.

[0029] To facilitate the connection of the hexagonal nut to the high-pressure hose, the length of the first mating portion 21 is greater than the length of the small-diameter section of the stepped hole 12, and the difference between the two is greater than or equal to 0.8 mm and less than or equal to 1.2 mm. In this embodiment, the difference between the two is optimally 1 mm; the gap between the outer wall of the first mating portion 21 and the inner wall of the small-diameter section of the stepped hole 12 is greater than or equal to 0.2 mm and less than or equal to 0.4 mm. In this implementation, it is optimally 0.25 mm; the advantage of this structural design is that there is a certain amount of movement space between the hexagonal nut and the joint core, which facilitates installation when the hexagonal nut is connected to the high-pressure hose.

[0030] To prevent the joint core from rotating when the hexagonal nut is connected to the high-pressure hose, in this embodiment, the bottom surface of the first groove 23 is a tooth surface. The length of the bottom surface of the first groove 23 is half of the outer diameter of the second mating portion 22. The first groove 23 is four or eight, and four or eight first grooves 23 are circumferentially evenly distributed around the axis of the joint core. Each first groove 23 corresponds to one locking groove 33; the maximum depth of the first groove 23 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0031] An installation method for a high-pressure hose joint, which includes the following steps:

[0032] a. Preparation: Determine the number and maximum depth of the first grooves 23 according to the outer diameter of the joint core 2. In this embodiment, the number of the first grooves 23 is four, and the maximum depth of the first grooves 23 is 1 mm;

[0033] b. Turning and machining: On the basis of a, use a numerically controlled machine tool to process the four first grooves 23 to the required dimensions in sequence;

[0034] c. Assembly: First step, install the outer sleeve 3 on the fixed seat of the swaging machine, with the hexagonal shaft section 31 facing up; second step, place the hexagonal nut 1 on the outer sleeve 3, with the stepped hole 12 facing down; third step, place the joint core 2 inside the hexagonal nut 1 and the outer sleeve 3, and use a copper rod to tap the joint core 2 to ensure that the lower end surface of the lug is completely fitted with the stepped surface of the stepped hole 12; fourth step, process the locking grooves 33 through the swaging machine, and the four locking grooves 33 are formed at one time;

[0035] d. Self-inspection: On the basis of c, conduct self-inspection on the assembled high-pressure hose joint. Rotate the hexagonal nut 1 to see if the joint core 2 rotates together. If the joint core 2 rotates together with the hexagonal nut 1, the assembled product is unqualified. If the joint core 2 does not rotate together with the hexagonal nut 1, the assembled product is qualified.

[0036] The high-pressure hose joint of the present invention has a simple structure, simple processes, is convenient and fast to install, has a low manufacturing cost, and can effectively prevent the joint core from rotating.

[0037] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An installation method of a high-pressure hose joint, the high-pressure hose joint comprising a hexagonal nut (1), a joint core (2) and an outer sleeve (3), characterized in that: The hexagonal nut (1) is provided with an internally threaded structure (11) and a stepped hole (12) arranged coaxially therein; the left end of the joint core (2) is successively provided with a lug, a first mating portion (21) and a second mating portion (22), the outer diameter of the lug is greater than the outer diameter of the first mating portion (21), the outer diameter of the first mating portion (21) is greater than the outer diameter of the second mating portion (22), and a first groove (23) is provided on the outer wall of the second mating portion (22); the outer sleeve (3) includes an outer sleeve body and a hexagonal shaft section (31), and a transition groove (32) is provided between the hexagonal shaft section (31) and the outer sleeve body; the joint core (2) penetrates through the hexagonal nut (1) and the outer sleeve (3), the lug is arranged within the hexagonal nut (1), and a gap is left between the outer wall of the first mating portion (21) and the inner wall of the small-diameter section of the stepped hole (12); a locking groove (33) is provided at the mating position of the transition groove (32) and the first groove (23), and the locking groove (33) locks the joint core (2) and the outer sleeve (3); the bottom surface of the first groove (23) is a tooth surface, the first groove (23) is four or eight in number, and each first groove (23) corresponds to one locking groove (33); It further includes the following steps: a. Preparation work: Determine the number and maximum depth of the first grooves (23) according to the outer diameter of the joint core (2); b. Turning and machining: On the basis of a, successively machine the first grooves (23) to the dimensional requirements by means of a numerical control machine tool; c. Assembly: First step, install the outer sleeve (3) on the fixed seat of the swaging machine, with the hexagonal shaft section (31) facing upwards; second step, place the hexagonal nut (1) on the outer sleeve (3), with the stepped hole (12) facing downwards; third step, place the joint core (2) within the hexagonal nut (1) and the outer sleeve (3), and use a copper rod to strike the joint core (2) to ensure that the lower end surface of the lug is fully mated with the step surface of the stepped hole (12); fourth step, machine the locking groove (33) through the swaging machine; d. Self-inspection: On the basis of c, conduct self-inspection on the assembled high-pressure hose joint, rotate the hexagonal nut (1) to see if the joint core (2) rotates together. If the joint core (2) rotates together with the hexagonal nut (1), the assembled product is unqualified; if the joint core (2) does not rotate together with the hexagonal nut (1), the assembled product is qualified.

2. The installation method of a high-pressure hose joint as claimed in claim 1, characterized in that: The length of the first mating portion (21) is greater than the length of the small-diameter section of the stepped hole (12), and the difference between the two is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

3. The installation method of a high-pressure hose joint as claimed in claim 1, characterized in that: The gap is greater than or equal to 0.2 mm and less than or equal to 0.4 mm.

4. The installation method of the high-pressure hose joint according to claim 1, characterized in that: The maximum depth of the first groove (23) is greater than or equal to 1 mm and less than or equal to 2 mm.

5. The installation method of the high-pressure hose joint according to claim 1, characterized in that: The hexagon nut (1) is a sleeve nut.

6. The installation method of the high-pressure hose joint according to claim 1, characterized in that: In step c, four or eight of the locking grooves (33) are formed at one time.

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