CN111442142A - Locking mechanism of cutting ferrule formula joint - Google Patents

Locking mechanism of cutting ferrule formula joint Download PDF

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Publication number
CN111442142A
CN111442142A CN202010426621.1A CN202010426621A CN111442142A CN 111442142 A CN111442142 A CN 111442142A CN 202010426621 A CN202010426621 A CN 202010426621A CN 111442142 A CN111442142 A CN 111442142A
Authority
CN
China
Prior art keywords
ferrule
nut
loosening
matched
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010426621.1A
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Chinese (zh)
Inventor
王述益
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Kaiheng Guangyue Machinery Manufacturing Co ltd
Original Assignee
Shanghai Kaiheng Guangyue Machinery Manufacturing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Kaiheng Guangyue Machinery Manufacturing Co ltd filed Critical Shanghai Kaiheng Guangyue Machinery Manufacturing Co ltd
Priority to CN202010426621.1A priority Critical patent/CN111442142A/en
Publication of CN111442142A publication Critical patent/CN111442142A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/005—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts comprising locking means for the threaded member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Pressure Members (AREA)

Abstract

The invention discloses a locking mechanism of a ferrule type joint, which comprises a ferrule, a nut, a joint body, a ferrule, a locking pin and an indicating check ring. The joint body and the nut are provided with threads matched with each other. The rear end of the cutting sleeve is provided with a driving outer conical surface and a plurality of axial grooves are uniformly and symmetrically distributed. The inner hole of the nut is provided with a driving inner conical surface and an axial groove; the front end of the anti-loosening pin is a partial sphere with two parallel planes, the middle of the anti-loosening pin is a rod part with the diameter the same as the distance between the two planes on the sphere, the rear end of the rod part is provided with two axially symmetrical flat-bottom retainer ring fixing grooves, and the bottom plane of each retainer ring fixing groove is parallel to the upper plane of the sphere. The indicating retainer ring is provided with an inner hole with the diameter matched with the clamping sleeve pipe, and the retainer ring is provided with a special-shaped hole matched with the appearance of the retainer ring fixing groove on the anti-loosening pin. The anti-loosening mechanism of the ferrule type joint can fix the ferrule nut to prevent loosening, and solves the potential safety hazard in the prior art.

Description

Locking mechanism of cutting ferrule formula joint
Technical Field
The invention relates to the technical field of a ferrule type joint, in particular to a locking mechanism of the ferrule type joint.
Background
The cutting ferrule type joint in the standards of ISO8434, SAE J514 and the like is widely applied to various hydraulic and pneumatic pipeline systems and is commonly used in the industries of airplanes, trains, shipping, engineering machinery, electric power, gas and the like.
The cutting edge at the front end of the cutting sleeve is pushed by the nut, and the cutting sleeve is downwards cut into the cutting sleeve along the inner conical surface of the connector body, so that hard sealing is formed between the cutting sleeve and the inner conical surface of the connector body and between the outer diameters of the cutting sleeve and the connector body. The clamping sleeve and the nut are connected through the conical surface, but when the clamping sleeve and the nut are used, due to the problems of the connection mode, vibration which is difficult to avoid, internal pressure impact and other various internal and external factors, the clamping sleeve and the nut slide along the contacted conical surface, so that the nut is loosened, once the loosening starts, the sealing performance of the whole connection is greatly influenced, even the failure of the whole pipeline system can be caused, and a serious safety result is generated.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the anti-loosening mechanism of the ferrule type joint, which solves the problem of loosening of a nut in the use process.
The technical scheme is as follows:
in order to solve the above problems, the present invention provides the following technical solutions: a locking mechanism of a ferrule type joint comprises a ferrule, a nut, a joint body, a ferrule tube, a locking pin and an indicating check ring; be provided with the screw thread of mutually supporting on the body of connecting and the nut, its characterized in that:
the connector body is provided with a cylindrical hole matched with the outer diameter of the clamping sleeve pipe, and an inner conical surface is arranged between the end surface of the connector body and the cylindrical hole;
the cutting sleeve is arranged in the nut, an inner hole of the cutting sleeve is matched with the cutting sleeve pipe, an annular front cutting edge is arranged on the inner wall of the front end of the cutting sleeve, an annular second cutting edge is arranged behind the front cutting edge, the outer surface of the front end of the cutting sleeve is an outer conical surface which is small in front and large in back, a first section of cylindrical surface is arranged behind the outer conical surface, a second cylindrical surface which is larger in diameter than the first cylindrical surface is arranged behind the first section of cylindrical surface, a driving outer conical surface which is large in front and small in back is arranged between the second cylindrical surface and the back end surface, a plurality of axial grooves which are uniformly and symmetrically distributed and have the same width are formed in the direction from the back end surface to the front end surface, the front ends of the axial;
the inner diameter of the through hole of the nut is matched with the outer diameter of the clamping sleeve pipe, the rear part of the internal thread of the nut is provided with a driving inner conical surface matched with the driving outer conical surface of the clamping sleeve, and the inner hole of the nut is provided with an axial groove;
the front end of the anti-loosening pin is a partial sphere with two parallel planes, a section of cylindrical rod is arranged behind the sphere, the diameter of the cylindrical rod is equal to the distance between the two planes on the sphere, and the rear end of the rod part is provided with two flat-bottom retainer ring fixing grooves which are axially symmetrical;
the inner hole of the indicating retainer ring is tightly matched with the outer diameter of the clamping sleeve, and the retainer ring is provided with a special-shaped hole which is tightly matched with the outer shape of the retainer ring fixing groove on the anti-loosening pin.
Preferably, the axial grooves at the rear end of the ferrule are angled at 30 or 45 degrees to each other, i.e. there are 12 or 8 axial grooves, respectively. When the ferrule type fitting is installed at the torque excitation point, it is normally required to tighten the nut 1/6 to 1/2 turns, and within this tolerance, it is ensured that at 1 or several of the positions, the axial groove positions on the ferrule are aligned with the axial groove positions on the nut.
Preferably, the number of the axial grooves of the inner hole of the nut can be 1, or 2-4 in uniform distribution, and the width of the axial grooves is equal to that of the axial grooves on the cutting sleeve.
Preferably, the diameter of the ball body part of the anti-loosening pin is matched with the diameter of the radial cylindrical through hole in the clamping sleeve, the diameter of the rod part of the anti-loosening pin is matched with the width of the axial groove in the clamping sleeve, and the anti-loosening pin is integrally hardened. Therefore, the anti-loosening pin can be positioned in the cylindrical hole of the clamping sleeve through the axial grooves in the clamping sleeve and the nut, then the anti-loosening pin is rotated by 90 degrees, the head of the anti-loosening pin can be clamped in the clamping sleeve, the anti-loosening pin is prevented from being separated, and the strength of the anti-loosening pin is ensured through the integral hardening treatment.
Preferably, the number of the special-shaped holes on the indicating ring is consistent with the number of the anti-loosening pins used, and the material of the indicating ring is rubber or plastic. The purpose of using rubber or plastics is to ensure that the indicating ring is clamped on the clamping sleeve and is prevented from loosening. The second is to make the special hole on the indicating ring easy to be blocked in the ring fixing groove of the anti-loose pin.
(III) advantageous effects
The invention has the beneficial effects that: the anti-loosening pins are arranged in the clamping sleeve axial groove and the nut axial groove, so that the nut is prevented from rotating, and potential safety hazards caused by loosening of the nut are eliminated. The combination of the special-shaped hole on the indicating check ring and the check ring fixing groove on the check pin prevents the rotation of the check pin, prevents the check pin from being separated, and ensures the reliability of the whole machine. The mechanism is convenient to disassemble and assemble.
Drawings
FIG. 1 is a schematic view of the mechanism of the present invention prior to installation;
FIG. 2 is a schematic view of the mechanism of the present invention after installation;
fig. 3 is a front view of the anti-loosening pin 5;
fig. 4 is a top view of the anti-loosening pin 5;
fig. 5 shows a schematic view of a collar 6, illustrating a shaped hole 61;
fig. 6 a cross-sectional view of the ferrule 1;
figure 7 ferrule figure 6, part C, is a partial top view showing the axial slot 11 and radial cylindrical bore 12 on the ferrule;
FIG. 8 is a left side view of the nut 2 illustrating the axial slots 21 on the nut;
the reference numerals are explained below:
1 cutting sleeve, 2 nuts, 3 joint bodies, 4 clamping sleeves, 5 anti-loosening pins and 6 indicating check rings
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described with reference to the following embodiments.
Referring to the schematic view of the mutual positions of the parts before the installation of the ferrule shown in fig. 1, the invention comprises a connector body 3 for connecting with a ferrule tube 4, an indicating ring 6, an anti-loosening pin 5, a ferrule 1 and a nut 2 for driving and pressing the ferrule. Referring to the schematic mutual position diagram of the ferrule 1, the nut 2, the connector body 3 and the ferrule tube 4 before the ferrule tube is installed as shown in fig. 1, after the ferrule 1 is preassembled, when the nut 2 is screwed to a torque excitation point, the front end of the ferrule 2 cuts into the outer wall of the ferrule tube 4, the nut 2 is screwed continuously, in a screwing tolerance range of 1/6 to 1/2 circles, it can be ensured that at a certain position, the position of the axial groove 11 on the ferrule 1 is aligned with the position of the axial groove 21 on the nut 2, two planes 51 of the ball head part of the anti-loosening pin 5 are attached to the side surface of the axial groove 21 on the nut 2, the anti-loosening pin is inserted into the axial groove until reaching the radial cylindrical through hole 12 at the bottom of the axial groove 11 of the ferrule 1, the anti-loosening pin is rotated by 90 degrees, the ball head part 52 of the anti-loosening pin 5 is clamped in the radial cylindrical through hole 12 of the ferrule 1, the special-shaped hole 61 of the indicating, the entire installation process is completed as shown in fig. 2. When the disassembly is carried out, the whole mechanism can be normally disassembled only by disengaging the indicating retainer ring 6 and pulling out the anti-loosening pin 5 after rotating for 90 degrees.
The specific working principle is as follows:
the invention relates to a locking mechanism of a ferrule type joint, which comprises a joint body 3 connected with a ferrule tube 4, an indicating retainer ring 6, a locking pin 5, a ferrule 1 and a nut 2 used for driving and pressing the ferrule, wherein after the mechanism is installed, as shown in figure 2, the middle part of the ferrule 1 is arched to generate an axial thrust on an inner conical surface of the nut 2 in the direction of an outer conical surface, if a system has internal and external factors which easily cause the nut to loosen, such as vibration or internal pressure impact, and the like, the nut 2 generates a loosening trend and starts to rotate towards the loosening direction, namely anticlockwise, and the anticlockwise rotation drives the ferrule 1 to rotate anticlockwise in the same direction through the locking pin 5. Because the front end of cutting ferrule 1 has cut into cutting ferrule pipe 4, the department frictional force that cuts is very big, and is unable rotatory, leads to cutting ferrule 1 inside to produce a clockwise moment of torsion, and this moment of torsion direction offsets with the moment of torsion that arouses nut 2 not hard up each other to the not hard up of nut has been prevented.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiments should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various improvements and modifications can be made without departing from the spirit and scope of the invention, and these improvements and modifications should also be construed as within the scope of the invention.

Claims (5)

1. A locking mechanism of a ferrule type joint comprises a ferrule, a nut, a joint body, a ferrule tube, a locking pin and an indicating check ring; be provided with the screw thread of mutually supporting on the body of connecting and the nut, its characterized in that:
the connector body is provided with a cylindrical hole matched with the outer diameter of the clamping sleeve pipe, and an inner conical surface is arranged between the end surface of the connector body and the cylindrical hole;
the cutting sleeve is arranged in the nut, an inner hole of the cutting sleeve is matched with the cutting sleeve pipe, an annular front cutting edge is arranged on the inner wall of the front end of the cutting sleeve, an annular second cutting edge is arranged behind the front cutting edge, the outer surface of the front end of the cutting sleeve is an outer conical surface which is small in front and large in back, a first section of cylindrical surface is arranged behind the outer conical surface, a second cylindrical surface which is larger in diameter than the first cylindrical surface is arranged behind the first section of cylindrical surface, a driving outer conical surface which is large in front and small in back is arranged between the second cylindrical surface and the back end surface, a plurality of axial grooves which are uniformly and symmetrically distributed and have the same width are formed in the direction from the back end surface to the front end surface, the front ends of the axial;
the inner diameter of the through hole of the nut is matched with the outer diameter of the clamping sleeve pipe, the rear part of the internal thread of the nut is provided with a driving inner conical surface matched with the driving outer conical surface of the clamping sleeve, and the inner hole of the nut is provided with an axial groove;
the front end of the anti-loosening pin is a partial sphere with two parallel planes, a section of cylindrical rod is arranged behind the sphere, the diameter of the cylindrical rod is equal to the distance between the two planes on the sphere, and the rear end of the rod part is provided with two flat-bottom retainer ring fixing grooves which are axially symmetrical;
the inner hole of the indicating retainer ring is tightly matched with the outer diameter of the clamping sleeve, and the retainer ring is provided with a special-shaped hole which is tightly matched with the outer shape of the retainer ring fixing groove on the anti-loosening pin.
2. The anti-loosening mechanism for the ferrule-type fitting according to claim 1, wherein: the mutual included angle between the axial grooves at the rear end of the cutting sleeve is 30 degrees or 45 degrees.
3. The anti-loosening mechanism for the ferrule-type fitting according to claim 1, wherein: the number of the axial grooves of the inner hole of the nut can be 1 or 2-4 in uniform distribution, and the width of the axial grooves is equal to that of the axial grooves on the clamping sleeve.
4. The anti-loosening mechanism for the ferrule-type fitting according to claim 1, wherein: the diameter of the sphere part of the anti-loosening pin is matched with the diameter of a radial cylindrical hole in the cutting sleeve, the diameter of the rod part of the anti-loosening pin is matched with the width of an axial groove in the cutting sleeve, and the whole anti-loosening pin is subjected to hardening treatment.
5. The anti-loosening mechanism for the ferrule-type fitting according to claim 1, wherein: the number of the special-shaped holes on the indicating check ring is consistent with the number of the used anti-loosening pins, and the indicating check ring is made of rubber or plastic.
CN202010426621.1A 2020-05-19 2020-05-19 Locking mechanism of cutting ferrule formula joint Pending CN111442142A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010426621.1A CN111442142A (en) 2020-05-19 2020-05-19 Locking mechanism of cutting ferrule formula joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010426621.1A CN111442142A (en) 2020-05-19 2020-05-19 Locking mechanism of cutting ferrule formula joint

Publications (1)

Publication Number Publication Date
CN111442142A true CN111442142A (en) 2020-07-24

Family

ID=71652237

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010426621.1A Pending CN111442142A (en) 2020-05-19 2020-05-19 Locking mechanism of cutting ferrule formula joint

Country Status (1)

Country Link
CN (1) CN111442142A (en)

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