CN110701401B

CN110701401B - Hydraulic pipeline joint

Info

Publication number: CN110701401B
Application number: CN201910994323.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Ningbo Lian Lian Fluid Machinery Manufacturing Co ltd
Current assignee: Ningbo Lian Lian Fluid Machinery Manufacturing Co.,Ltd.
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2021-06-15
Anticipated expiration: 2039-10-18
Also published as: CN110701401A

Abstract

The invention relates to the field of pipeline joints, in particular to a hydraulic pipeline joint which comprises a pipeline joint, a connecting mechanism, a protection mechanism, a steering mechanism and a filtering mechanism, wherein the connecting mechanism is arranged at two ends of the pipeline joint, the protection mechanism is arranged outside the connecting mechanism, the steering mechanism and the filtering mechanism are arranged inside the pipeline joint, the pipeline joint comprises a first connecting pipe, a second connecting pipe, a third connecting pipe, a liquid inlet pipe and a liquid outlet pipe, and one end of the first connecting pipe is connected with the liquid inlet pipe through the connecting mechanism. Through setting up coupling mechanism, utilize the connecting cylinder among the coupling mechanism to promote the cock board and remove, the leak protection packing ring that makes the connecting cylinder insert first connecting pipe back pipeline inside can not take place to reveal through setting up, and then makes the pipeline intercommunication, when the connecting cylinder withdraws from first connecting pipe, the spring promotes the cock board and kick-backs, plugs up the passageway, and then has prevented that the pipeline switch-on from taking place to reveal in the connection and reducing work efficiency, prevents to cause the influence to the job schedule.

Description

Hydraulic pipeline joint

Technical Field

The invention relates to the field of pipeline joints, in particular to a hydraulic pipeline joint.

Background

In the operation of hydraulic lines, it is often the case that the lines are connected. In the process of connecting or disconnecting the pipeline, how to ensure the sealing degree of the pipeline and optimize the connection mode of the connection joint is a technical problem.

In the pipeline system of a machine, the pipeline is important for the operation of the machine, and when the pipeline joint is used for a period of time, some damage may occur, such as: reveal, need change the pipeline joint, and the pipeline joint can't guarantee that the pipeline can not leak at the dismouting in-process, at first, need seal the headlock of pipeline, carry out the change of pipeline joint again after sealed, need wait for a long time just can install the change to the pipeline, the work efficiency is reduced, the cost is increased, also can influence the job schedule simultaneously, and the pipe wall of articulate department is thinner, because the junction that frequent dismouting made is comparatively fragile, if pipeline junction breaks so whole pipeline can all be lost the effect, and the pipeline is often needed to turn to in the operation work of hydraulic pressure pipeline, pipeline and pipeline joint can't make the pipeline turn to inconvenient fixed, consequently, propose a hydraulic pressure pipeline joint to above-mentioned problem.

Disclosure of Invention

To address the problems in the prior art, the present invention provides a hydraulic line coupling.

The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic pipeline joint comprises a pipeline joint, a connecting mechanism, a protection mechanism, a steering mechanism and a filtering mechanism, wherein the connecting mechanism is arranged at each of two ends of the pipeline joint, the protection mechanism is arranged outside the connecting mechanism, and the steering mechanism and the filtering mechanism are arranged inside the pipeline joint; the pipeline joint includes first connecting pipe, second connecting pipe, third connecting pipe, feed liquor pipe, drain pipe, the one end of first connecting pipe is connected with the feed liquor pipe through coupling mechanism, the other end of first connecting pipe is connected with the second connecting pipe through steering mechanism, the other end fixedly connected with third connecting pipe of second connecting pipe, the other end of third connecting pipe is connected with the drain pipe through coupling mechanism.

Specifically, the connecting mechanism comprises a connecting cylinder, a connecting thread, a supporting rod, a telescopic sleeve, a telescopic loop bar, a spring, a plug plate, a plugging ring, a leakage-proof washer and a threaded ring, one of the connecting cylinders is fixedly connected at one end of the liquid inlet pipe close to the first connecting pipe, the surface of the connecting cylinder is provided with the connecting thread, the supporting rod is fixedly connected inside the first connecting pipe, the telescopic sleeve is fixedly connected at the center of one side of the supporting rod close to the liquid inlet pipe, the telescopic loop bar is sleeved inside the telescopic sleeve, the same spring is sleeved on the surfaces of the telescopic sleeve and the telescopic loop bar, the plug plate is fixedly connected at the other end of the telescopic loop bar, the plugging ring corresponding to the plug plate of the connecting pipe is fixedly connected inside the first connecting pipe, the leakage-proof washer is placed outside the plugging ring inside of the first connecting pipe, the threaded ring is arranged outside the leakage-proof washer inside the first, the thread ring corresponds to the connecting thread.

Specifically, protection mechanism includes a movable protection section of thick bamboo, slip ring, ring channel, a fixed protection section of thick bamboo, external screw thread, internal thread, one of them cup joints on the surface of first connecting pipe of a movable protection section of thick bamboo, fixedly connected with slip ring on the inner wall of a movable protection section of thick bamboo, the slip ring joint is inside the ring channel, the ring channel is seted up at first connecting pipe on the surface, the outer fixed surface of feed liquor pipe is connected with a fixed protection section of thick bamboo, the external screw thread has been seted up to the surface of a movable protection section of thick bamboo, set up the internal thread that corresponds the setting with the external screw thread on the inner wall of a fixed.

Specifically, steering mechanism includes metal collapsible tube, first backup pad, second backup pad, pivot, metal collapsible tube's both ends difference fixed connection is on the inner wall of second connecting pipe and third connecting pipe one end in opposite directions, the second connecting pipe is close to two first backup pads of the one end symmetry fixedly connected with of third connecting pipe, the third connecting pipe is close to two second backup pads of the one end symmetry fixedly connected with of second connecting pipe, two first backup pad rotates through two pivots respectively with two second backup pads and is connected.

Specifically, the filtering mechanism comprises a filtering cup, a filtering through hole, a filtering core, clamping blocks, clamping grooves, a leakage-proof pad, a fixed threaded cylinder and a fixed threaded groove, the filtering cup is sleeved inside the second connecting pipe, the filtering through hole is formed in the bottom of the filtering cup, the filtering core is filled inside the filtering cup, two symmetrically-arranged clamping blocks are fixedly connected to the outer surface of the filtering cup, the clamping grooves corresponding to the two clamping blocks are formed in the inner wall of the second connecting pipe, the leakage-proof groove is formed in the contact part of the second connecting pipe and the rest of the third connecting pipe, the leakage-proof pad is placed inside the leakage-proof groove, the fixed threaded cylinder is fixedly connected to one end, close to the second connecting pipe, of the third connecting pipe, and the fixed threaded groove corresponding to the fixed threaded cylinder is formed in the outer wall of one end, close to the third connecting; the other end of the filter cup is provided with a sealing plug, a groove is arranged on the sealing plug, and the groove is arranged corresponding to the conduction pipe arranged on the support rod.

Specifically, the two connecting mechanisms have the same structure, and the external protection mechanisms of the two connecting mechanisms have the same structure.

The invention has the beneficial effects that:

(1) according to the hydraulic pipeline joint, the connecting cylinder in the connecting mechanism is used for pushing the plug plate to move through the connecting mechanism, the leakage-proof gasket is arranged to enable the connecting cylinder to be inserted into the first connecting pipe, leakage does not occur inside the pipeline, the pipeline is communicated, when the connecting cylinder exits from the first connecting pipe, the spring pushes the plug plate to rebound, a channel is blocked, the pipeline is prevented from being communicated, leakage in the connecting process is prevented, the working efficiency is reduced, and the working progress is prevented from being influenced; the filtering mechanism that sets up realizes the preliminary sealing of pipeline when changing, and sealed later in the installation, the other end drives the bracing piece motion through flexible loop bar, and the motion of bracing piece drives the motion of conduction pipe, realizes short sealing through filtering mechanism, realizes lining up of inner tube way when the conduction pipe imbeds the inside of sealing plug for work efficiency.

(2) According to the hydraulic pipeline joint, the protection mechanism is arranged, the fixed protection cylinder and the movable protection cylinder in the protection mechanism are used for protecting the pipeline joint, when the liquid inlet pipe is connected with the first connecting pipe, the movable protection cylinder is rotated, the fixed protection cylinder and the movable protection cylinder are connected through the external threads and the internal threads, and then the joint is protected.

(3) According to the hydraulic pipeline joint, the steering mechanism is arranged, the metal hose between the first connecting pipe and the second connecting pipe is utilized to enable the pipeline joint to be capable of being bent, so that the bending angle of the pipeline joint can be adjusted according to different working conditions, and the hydraulic pipeline joint is convenient to use.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of an external structure of a hydraulic line joint according to the present invention;

FIG. 2 is a schematic diagram of an internal structure of a hydraulic line coupling according to the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2 of a hydraulic line coupling according to the present invention;

FIG. 4 is an enlarged view of portion B of FIG. 2 of a hydraulic line coupling according to the present invention;

fig. 5 is an enlarged view of a portion C shown in fig. 2 of a hydraulic line coupling according to the present invention.

In the figure: 1. a pipe joint; 11. a first connecting pipe; 12. a second connecting pipe; 13. a third connecting pipe; 14. a liquid inlet pipe; 15. a liquid outlet pipe; 2. a connecting mechanism; 21. a connecting cylinder; 22. connecting threads; 23. a support bar; 231. a conduction pipe; 24. a telescopic sleeve; 25. a telescopic loop bar; 26. a spring; 27. a plug plate; 28. a plugging ring; 29. a leak-proof gasket; 210. a thread ring; 3. a protection mechanism; 31. a movable protection cylinder; 32. a slip ring; 33. an annular groove; 34. fixing a protection cylinder; 35. an external thread; 36. an internal thread; 4. a steering mechanism; 41. a metal hose; 42. a first support plate; 43. a second support plate; 44. a rotating shaft; 5. a filtering mechanism; 51. a filter cup; 52. a filtration through hole; 53. a filter element; 54. a clamping block; 55. a card slot; 56. a leakage-proof pad; 57. fixing the threaded cylinder; 58. fixing the thread groove; 59. a sealing plug; 59a, grooves.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the hydraulic pipeline joint according to the present invention includes a pipeline joint 1, a connection mechanism 2, a protection mechanism 3, a steering mechanism 4, and a filtering mechanism 5, wherein the connection mechanism 2 is disposed at both ends of the pipeline joint 1, the protection mechanism 3 is disposed outside the connection mechanism 2, and the steering mechanism 4 and the filtering mechanism 5 are disposed inside the pipeline joint 1.

Specifically, pipeline joint 1 includes first connecting pipe 11, second connecting pipe 12, third connecting pipe 13, feed liquor pipe 14, drain pipe 15, the one end of first connecting pipe 11 is connected with feed liquor pipe 14 through coupling mechanism 2, the other end of first connecting pipe 11 is connected with second connecting pipe 12 through steering mechanism 4, the other end fixedly connected with third connecting pipe 13 of second connecting pipe 12, the other end of third connecting pipe 13 is connected with drain pipe 15 through coupling mechanism 2.

Specifically, the connecting mechanism 2 includes a connecting cylinder 21, a connecting thread 22, a supporting rod 23, a telescopic sleeve 24, a telescopic loop bar 25, a spring 26, a plug plate 27, a blocking ring 28, a leakage-proof washer 29 and a thread ring 210, one of the connecting cylinder 21 is fixedly connected to one end of the liquid inlet pipe 14 close to the first connecting pipe 11, the connecting thread 22 is arranged on the surface of the connecting cylinder 21, the supporting rod 23 is fixedly connected to the inside of the first connecting pipe 11, the telescopic sleeve 24 is fixedly connected to the center of one side of the supporting rod 23 close to the liquid inlet pipe 14, the telescopic loop bar 25 is sleeved inside the telescopic sleeve 24, the same spring 26 is sleeved on the surfaces of the telescopic sleeve 24 and the telescopic loop bar 25, the plug plate 27 is fixedly connected to the other end of the telescopic loop bar 25, the blocking ring 28 corresponding to the plug plate 27 is fixedly connected to the inside of the first connecting pipe 11, leak protection packing ring 29 has been placed to the inside of first connecting pipe 11 is located the shutoff ring 28 outside, the inside of first connecting pipe 11 is located the leak protection packing ring 29 outside and is equipped with thread circle 210, thread circle 210 is corresponding with connecting thread 22, utilizes connecting cylinder 21 among coupling mechanism 2 to promote cock board 27 and removes, and the pipeline is inside can not take place to reveal after making connecting cylinder 21 insert first connecting pipe 11 through the leak protection packing ring 29 that sets up, and then makes the pipeline intercommunication, when connecting cylinder 21 withdraws from first connecting pipe 11, spring 26 promotes the resilience of cock 27 board, plugs up the passageway, and then has prevented that the pipeline switch-on from taking place to reveal reduction work efficiency in the connection, prevents to cause the influence to the working schedule.

Specifically, the protection mechanism 3 includes a movable protection cylinder 31, a sliding ring 32, an annular groove 33, a fixed protection cylinder 34, an external thread 35, and an internal thread 36, one of the movable protection cylinder 31 is sleeved on the outer surface of the first connection pipe 11, the sliding ring 32 is fixedly connected to the inner wall of the movable protection cylinder 31, the sliding ring 32 is clamped inside the annular groove 33, the annular groove 33 is opened on the surface of the first connection pipe 11, the fixed protection cylinder 34 is fixedly connected to the outer surface of the liquid inlet pipe 14, the external thread 35 is opened on the outer surface of the movable protection cylinder 31, the internal thread 36 corresponding to the external thread 35 is opened on the inner wall of the fixed protection cylinder 34, the interactive protection cylinder 31 is slidably connected to the first connection pipe 11 through the sliding ring 32 and the annular groove 33, and the movable protection cylinder 31 and the fixed protection cylinder 34 can be threadedly connected through the external thread 35 and the internal thread 36, thereby protecting the pipeline joint.

Specifically, steering mechanism 4 includes metal collapsible tube 41, first backup pad 42, second backup pad 43, pivot 44, metal collapsible tube 41's both ends difference fixed connection is on the inner wall of second connecting pipe 12 and third connecting pipe 13 one end in opposite directions, two first backup pads 42 of the one end symmetry fixedly connected with that second connecting pipe 12 is close to third connecting pipe 13, two second backup pads 43, two of the one end symmetry fixedly connected with that third connecting pipe 13 is close to second connecting pipe 12 first backup pad 42 and two second backup pads 43 rotate through two pivots 44 respectively and are connected, make the pipeline joint can buckle through the metal collapsible tube 41 that is in second connecting pipe 12 and third connecting pipe 13 one end fixed connection in opposite directions, and then conveniently adjust the angle of buckling of pipeline as required at the during operation, facilitate the use.

Specifically, the filtering mechanism 5 includes a filtering cup 51, a filtering through hole 52, a filtering core 53, a fixture block 54, a clamping groove 55, a leakage-proof pad 56, a fixed threaded cylinder 57, and a fixed threaded groove 58, the filtering cup 51 is sleeved inside the second connecting pipe 12, the bottom of the filtering cup 51 is provided with the filtering through hole 52, the filtering core 53 is filled inside the filtering cup 51, the outer surface of the filtering cup 51 is fixedly connected with two symmetrically-arranged fixture blocks 54, the inner wall of the second connecting pipe 12 is provided with the clamping grooves 55 corresponding to the two fixture blocks 54, the contact part of the second connecting pipe 12 and the rest of the third connecting pipe 13 is provided with the leakage-proof groove, the leakage-proof pad 56 is placed inside the leakage-proof groove, one end of the third connecting pipe 13 close to the second connecting pipe 12 is fixedly connected with the fixed threaded cylinder 57, the outer wall of one end of the second connecting pipe 12 close to the third connecting pipe 13 is provided with the fixed threaded groove 58 corresponding to the, the filter cup 51 is clamped in the clamping groove 55 arranged in the second connecting pipe 12, and the liquid flowing through the second connecting pipe 12 is filtered through the filter element 53 arranged in the filter cup 51, so that the influence of impurities in the liquid on subsequent work is prevented; a sealing plug 59 is installed at the other end of the filtering cup 51, a groove 59a is formed in the sealing plug 59, and the groove 59a is arranged corresponding to the conduction pipe 231 arranged on the supporting rod 23.

Specifically, two coupling mechanism 2 structures are the same, two coupling mechanism 2 outside protection mechanism 3 structures are the same, and two coupling mechanism 2 structures are the same and make the both ends of pipeline joint reach the same leak protection effect, and two protection mechanism 3 structures are the same and make the both ends of pipeline joint department receive the same protection.

In use, the two connection cylinders 21 are aligned with the inside of the first connection pipe 11 and the third connection pipe 13, the liquid inlet pipe 14 and the liquid outlet pipe 15 are pushed, the two connection cylinders 21 are moved towards the inside of the first connection pipe 11 and the third connection pipe 13, when the two connection cylinders 21 pass through the leakage-proof gasket 29 provided on the inner wall of the first connection pipe 21 and the third connection pipe 13, the two leakage-proof gaskets 29 and the two connection cylinders 21 form a certain seal to the inside of the pipeline, the two connection cylinders 21 are rotated by the thread ring 210 provided on the inner wall of the first connection pipe 21 and the third connection pipe 13 and the connection thread 22 on the surface of the connection cylinder 21, then the two connection cylinders 21 push the plug plate 27 to move, the plug plate 27 is closed with the blocking ring 28 to communicate the pipeline, the movable protection cylinder 31 is moved by the sliding ring 32 and the annular groove 33, the movable protection cylinder 31 and the fixed protection cylinder 34 are screwed by the external thread 35 and the internal thread, the pipeline joint is wrapped inside the movable protection cylinder 31 and the fixed protection cylinder 34 to protect the pipeline joint, the metal hose 41 fixedly connected with one opposite end of the second connecting pipe 12 and the third connecting pipe 13 enables the pipeline joint to be bent, the metal hose 41 is protected by the first supporting plate 42 and the second supporting plate 43 which are connected in a rotating mode, the metal hose 41 is prevented from being damaged, the bending angle of the pipeline can be conveniently adjusted according to needs during work, the pipeline joint is convenient to use, the filter cup 51 is clamped by the clamping groove 55 arranged inside the second connecting pipe 12 and the clamping block 54 on the surface of the filter cup 51, liquid flowing through the inside of the second connecting pipe 12 is filtered by the filter core 53 arranged inside the filter cup 51, the influence of impurities in the liquid on subsequent work is prevented, when the pipeline joint needs to be disassembled, the liquid inlet pipe 14 and the liquid outlet pipe 15 are rotated, and then drive two connecting cylinders 21 and move to first connecting pipe 11 and third connecting pipe 13 outside, when connecting cylinder 21 withdrawed from shutoff ring 28, spring 26 promoted the resilience of stopper 27 board, blocked up the passageway, prevented to produce and revealed, and then prevented that the pipeline joint from revealing reduction work efficiency in the connection process, prevented to cause the influence to the job schedule.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A hydraulic line coupling, characterized by: the pipeline joint comprises a pipeline joint (1), a connecting mechanism (2), a protection mechanism (3), a steering mechanism (4) and a filtering mechanism (5), wherein the connecting mechanism (2) is arranged at each of two ends of the pipeline joint (1), the protection mechanism (3) is arranged outside the connecting mechanism (2), and the steering mechanism (4) and the filtering mechanism (5) are arranged inside the pipeline joint (1); the pipeline joint (1) comprises a first connecting pipe (11), a second connecting pipe (12), a third connecting pipe (13), a liquid inlet pipe (14) and a liquid outlet pipe (15), one end of the first connecting pipe (11) is connected with the liquid inlet pipe (14) through a connecting mechanism (2), the other end of the first connecting pipe (11) is connected with the second connecting pipe (12) through a steering mechanism (4), the other end of the second connecting pipe (12) is connected with the third connecting pipe (13), and the other end of the third connecting pipe (13) is connected with the liquid outlet pipe (15) through the connecting mechanism (2);

the connecting mechanism (2) comprises a connecting cylinder (21), connecting threads (22), a supporting rod (23), a telescopic sleeve (24), a telescopic loop bar (25), a spring (26), a plug plate (27), a blocking ring (28), a leakage-proof washer (29) and a thread ring (210), wherein one of the connecting cylinder (21) is fixedly connected with one end, close to the first connecting pipe (11), of the liquid inlet pipe (14), the connecting threads (22) are arranged on the surface of the connecting cylinder (21), the supporting rod (23) is fixedly connected with the inside of the first connecting pipe (11), the telescopic sleeve (24) is fixedly connected with the central part of one side, close to the liquid inlet pipe (14), of the supporting rod (23), the telescopic loop bar (25) is sleeved inside the telescopic sleeve (24), the same spring (26) is sleeved on the surfaces of the telescopic sleeve (24) and the telescopic loop bar (25), the other end of the telescopic loop bar (25) is fixedly connected with a plug plate (27), the inside of the first connecting pipe (11) is fixedly connected with a plugging ring (28) corresponding to the plug plate (27), a leakage-proof gasket (29) is placed on the outer side of the plugging ring (28) in the first connecting pipe (11), a threaded ring (210) is arranged on the outer side of the leakage-proof gasket (29) in the first connecting pipe (11), and the threaded ring (210) corresponds to the connecting thread (22);

the filtering mechanism (5) comprises a filtering cup (51), a filtering through hole (52), a filtering core (53), clamping blocks (54), clamping grooves (55), a leakage-proof gasket (56), a fixed threaded cylinder (57) and a fixed threaded groove (58), the filtering cup (51) is sleeved inside the second connecting pipe (12), the filtering through hole (52) is formed in the bottom of the filtering cup (51), the filtering core (53) is filled inside the filtering cup (51), the outer surface of the filtering cup (51) is fixedly connected with two symmetrically-arranged clamping blocks (54), the clamping grooves (55) corresponding to the two clamping blocks (54) are formed in the inner wall of the second connecting pipe (12), a leakage-proof groove is formed in the contact part of the second connecting pipe (12) and the third connecting pipe (13), the leakage-proof gasket (56) is placed inside the leakage-proof groove, the fixed threaded cylinder (57) is fixedly connected to one end, close to the second connecting pipe (12), of the third connecting pipe (13), a fixed thread groove (58) corresponding to the fixed thread cylinder (57) is formed in the outer wall of one end, close to the third connecting pipe (13), of the second connecting pipe (12); a sealing plug (59) is installed at the other end of the filter cup (51), a groove (59a) is formed in the sealing plug (59), and the groove (59a) is arranged corresponding to a conduction pipe (231) arranged on the support rod (23).

2. A hydraulic line coupling as claimed in claim 1, wherein: protection mechanism (3) including activity protection section of thick bamboo (31), slip ring (32), ring channel (33), a fixed protection section of thick bamboo (34), external screw thread (35), internal thread (36), one of them cup joints on the surface of first connecting pipe (11) of a activity protection section of thick bamboo (31), fixedly connected with slip ring (32) on the inner wall of an activity protection section of thick bamboo (31), slip ring (32) joint is inside ring channel (33), ring channel (33) are seted up at first connecting pipe (11) on the surface, the external fixed surface of feed liquor pipe (14) is connected with a fixed protection section of thick bamboo (34), external screw thread (35) have been seted up to the surface of an activity protection section of thick bamboo (31), set up on the inner wall of a fixed protection section of thick bamboo (34) and correspond the internal thread (36) that set up with external screw thread (35.

3. A hydraulic line coupling as claimed in claim 1, wherein: steering mechanism (4) include metal collapsible tube (41), first backup pad (42), second backup pad (43), pivot (44), the both ends difference fixed connection of metal collapsible tube (41) is on the inner wall of first connecting pipe (11) and second connecting pipe (12) one end in opposite directions, two first backup pads (42) of the one end symmetry fixedly connected with that first connecting pipe (11) are close to second connecting pipe (12), two second backup pads (43), two of the one end symmetry fixedly connected with that second connecting pipe (12) are close to first connecting pipe (11) first backup pad (42) rotate through two pivots (44) respectively with two second backup pads (43) and are connected.

4. A hydraulic line coupling as claimed in claim 1, wherein: the two connecting mechanisms (2) have the same structure, and the two protection mechanisms (3) outside the connecting mechanisms (2) have the same structure.