CN216413850U

CN216413850U - Pipeline generating line and bellows expansion joint for pipeline generating line

Info

Publication number: CN216413850U
Application number: CN202122122609.4U
Authority: CN
Inventors: 李忠富; 孙鹏; 闫亚刚; 张娟; 刘璐; 王艳芳; 王光磊; 赵献臣; 杨卫国; 蔡杰; 贺永明; 刘凯; 白玮; 张自华; 张培杰; 李中旗; 孙瑞峰; 陈亮; 赵张林; 翟秉璞
Original assignee: CSG Electric Power Research Institute; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Current assignee: CSG Electric Power Research Institute; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2022-04-29
Anticipated expiration: 2031-09-03

Abstract

The utility model relates to a pipeline bus and a corrugated pipe expansion joint for the pipeline bus, which comprises two bus barrels arranged at intervals along the left and right directions, wherein the opposite ends of the two bus barrels are provided with connecting flanges; the bellows expansion joint includes: the corrugated pipe comprises a corrugated pipe main body, wherein a static end flange is arranged at the right end of the corrugated pipe main body, and a dynamic end flange is arranged at the left end of the corrugated pipe main body; the left end of each adjusting rod is slidably assembled with the movable end flange in the left-right direction, and the right end of each adjusting rod is fixedly assembled with the static end flange; in the circumferential direction of the corrugated pipe main body, any two adjacent nut structures are in transmission connection through a synchronous transmission structure so as to realize synchronous rotation of all the nut structures, and when the nut structures rotate forwards synchronously, the nut structures move rightwards synchronously so as to synchronously compress the corrugated pipe main body; when the nut structures synchronously reverse, the nut structures move leftwards to synchronously release the corrugated pipe main body.

Description

Pipeline generating line and bellows expansion joint for pipeline generating line

Technical Field

The utility model relates to a pipeline bus and a corrugated pipe expansion joint for the pipeline bus.

Background

The temperature of the pipeline bus of the running GIS and the GIS is changed to expand with heat and contract with cold due to the change of the environmental temperature, the temperature rise generated when the GIS and the GIL are electrified, the irradiation of sunlight, wind, the radiation cooling in the morning and evening and the like. If the displacement generated by expansion with heat and contraction with cold is not correspondingly limited and absorbed, the GIS equipment is broken in support, displaced at intervals and even damaged by the equipment such as the cracking of a pipeline bus caused by large expansion amount. On the other hand, the pipeline buses of the GIS and the GIL are in hard connection, the conductive part is sealed inside the pipeline, once the pipeline is broken down, the pipeline needs to be dismounted for maintenance or replacement, if no telescopic structure is adopted, the local dismounting of the broken-down section cannot be carried out, and the maintenance cost is extremely high due to the integral dismounting. Therefore, a bellows expansion joint is usually arranged at regular intervals or regular lengths on the occasion of a longer pipeline bus for compensating displacement changes of the pipeline bus caused by thermal expansion and cold contraction, installation errors and the like, and the bellows can be compressed to achieve the purpose of disassembling or repairing a fault section.

The bus system and the standby connecting device thereof disclosed in the patent of the utility model with the publication number of CN110323822B comprise a corrugated pipe, two flanges are respectively arranged at two ends of the corrugated pipe and are respectively used for being connected with bus tubes at two sides of the corrugated pipe, two connecting screw rods are arranged between the two flanges and are symmetrically arranged about the central axis of the corrugated pipe, two ends of each connecting screw rod are respectively inserted on the two flanges and are limited by locking nuts, the distance between the two flanges is adjusted by rotating each locking nut, and then the corrugated pipe is compressed to a certain size so as to meet the requirement of the inner conductor and bus dismounting operation space.

However, when the corrugated pipe is compressed, in order to ensure that the corrugated pipe, the flange, the connecting screw rod and the locking nut are stressed uniformly and are not deformed and damaged in the process, at least two persons are required to operate the locking nuts respectively at the same time, which wastes manpower; or one person to each lock nut symmetry one by one slowly adjust, the step is loaded down with trivial details, wastes time and energy, and operating efficiency is not high to can not guarantee each lock nut and follow bellows axial displacement in step, consequently, the bellows atress is uneven, easily damages.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a corrugated pipe expansion joint for a pipeline bus, which aims to solve the technical problems that in the prior art, the corrugated pipe is stressed unevenly and is easy to damage due to the fact that locking nuts of a bus connecting device act one by one. The utility model also provides a pipeline bus, which solves the technical problems that the corrugated pipe is unevenly stressed and is easy to damage due to the fact that the adjusting nuts of the bus connecting device between the pipeline buses act one by one in the prior art.

In order to achieve the purpose, the technical scheme of the corrugated pipe expansion joint for the pipeline bus provided by the utility model is as follows: a corrugated pipe expansion joint for a pipeline bus comprises a corrugated pipe main body, wherein the corrugated pipe main body axially extends along the left and right directions, a static end flange is arranged at the right end of the corrugated pipe main body, a moving end flange is arranged at the left end of the corrugated pipe main body, and the static end flange and the moving end flange are respectively used for being connected with bus barrels at two axial sides of the corrugated pipe main body; the corrugated pipe expansion joint for the pipeline bus further comprises at least two adjusting rods, each adjusting rod extends along the left-right direction, the left end of each adjusting rod is slidably assembled with the movable end flange in the left-right direction, and the right end of each adjusting rod is fixedly assembled with the static end flange; the adjusting rod is provided with an external thread section, a nut structure is arranged corresponding to the adjusting rod, the nut structures are spirally assembled on the adjusting rod, and the nut structures are used for pushing the movable end flange to move rightwards when the adjusting rod is screwed forwards so as to adjust the length of the bellows expansion joint; in the circumferential direction of the corrugated pipe main body, any two adjacent nut structures are in transmission connection through a synchronous transmission structure so as to realize synchronous rotation of all the nut structures, and when the nut structures rotate forwards synchronously, the nut structures move rightwards synchronously so as to compress the corrugated pipe main body synchronously; when the nut structures synchronously reverse, the nut structures move leftwards to synchronously release the corrugated pipe main body.

The beneficial effects are that: according to the corrugated pipe expansion joint for the pipeline bus, the nut structures are connected through the synchronous transmission structure, so that the nut structures can rotate synchronously, the nut structures can move synchronously along the corresponding adjusting rods, the driving end flange is always located in a plane vertical to the corrugated pipe main body in the moving process, deflection cannot occur, the driving end flange is stressed evenly, and the corrugated pipe expansion joint is not prone to being damaged.

As a further improvement, the nut structure comprises a nut body, the nut body is used for being spirally assembled on the corresponding adjusting rod, the nut structure further comprises a bidirectional overrunning clutch structure, the bidirectional overrunning clutch structure comprises an outer ring driving part and an inner shaft driven part, the inner shaft driven part and the nut body are integrally arranged or fixedly assembled in a split mode, the synchronous transmission structure comprises synchronous transmission parts, the synchronous transmission parts are respectively arranged between the outer ring driving parts of any two nut structures which are adjacent in the circumferential direction of the corrugated pipe main body, so that the outer ring driving parts of all the nut structures can be driven to synchronously rotate in the forward direction and the reverse direction, and the nut body can be driven to rotate in the intermittent direction and in the reverse direction through the corresponding bidirectional overrunning clutch structure.

The beneficial effects are that: the nut structure is provided with the bidirectional overrunning clutch, so that the nut body can be driven to rotate intermittently in the forward direction and rotate intermittently in the reverse direction conveniently, the implementation is convenient, the rotation driving structure of the nut body is simple, and the manufacture is convenient.

As a further improvement, the bidirectional overrunning clutch structure is an externally engaged ratchet-pawl clutch structure, a ratchet wheel is arranged on a driven part of an inner shaft of the externally engaged ratchet-pawl clutch structure, a forward pawl and a reverse pawl are hinged on an outer ring driving part, a working position for being engaged with the ratchet wheel and an avoidance position for being disengaged from the ratchet wheel are respectively arranged on swinging strokes of the forward pawl and the reverse pawl, a pawl elastic part is arranged on the outer ring driving part and is used for applying elastic acting force to the forward pawl and the reverse pawl to force the corresponding pawl to swing towards the corresponding working position, a steering switching structure is further arranged on the outer ring driving part and is used for switching and driving the forward pawl and the reverse pawl to swing towards the corresponding avoidance position, and the steering switching structure is used for driving the reverse pawl to swing towards the corresponding avoidance position to be disengaged from the ratchet wheel when the forward pawl is engaged with the ratchet wheel, the steering switching structure is used for driving the forward rotation pawl to swing to the corresponding avoidance position to be disengaged from the ratchet wheel when the reverse rotation pawl is meshed with the ratchet wheel.

The beneficial effects are that: the outer-meshing type ratchet wheel-pawl clutch structure is adopted, a ratchet wheel is arranged at an inner shaft driven part, a forward rotation pawl and a reverse rotation pawl are arranged at an outer ring driving part, a working position for meshing with the ratchet wheel and an avoiding position for disengaging from the ratchet wheel are respectively arranged on the swing strokes of the forward rotation pawl and the reverse pawl, the overall structure is simple, and the outer ring driving part can conveniently and intermittently drive the inner shaft driven part to rotate in a bidirectional mode.

As a further improvement, the steering switching structure comprises a switching shaft extending along the left and right direction, the switching shaft is rotatably assembled on the outer ring driving part, a cam is arranged on the switching shaft and used for pushing the forward pawl and the reverse pawl to correspondingly avoid the swinging of the positions, the switching shaft is provided with a forward working position and a reverse working position on the rotating stroke, the switching shaft is used for pushing the reverse pawl to correspondingly avoid the positions when being positioned at the forward working position, and the switching shaft is used for pushing the forward pawl to correspondingly avoid the positions when being positioned at the reverse working position.

The beneficial effects are that: the switching shaft drives the cam to rotate so as to push the forward pawl and the reverse pawl to swing to the corresponding avoidance positions, the structure is simple, the corresponding pawl can be conveniently and directly pushed to swing, and the steering switching structure is simplified while the corresponding pawl is effectively pushed to the avoidance positions.

As a further improvement, the forward rotation pawl and the reverse rotation pawl are respectively provided with a hinged end for being hinged on the outer ring driving part and an engaging end for being engaged with the ratchet wheel, the cam is located at one side of the ratchet wheel facing the hinged ends of the forward rotation pawl and the reverse rotation pawl in the radial direction of the ratchet wheel, the cam is located between the forward rotation pawl and the reverse rotation pawl in the circumferential direction of the ratchet wheel, the cam is provided with a peripheral pushing surface, when the switching shaft rotates to the forward rotation working position, the peripheral pushing surface pushes the reverse rotation pawl to swing to a corresponding avoidance position, and when the switching shaft rotates to the reverse rotation working position, the peripheral pushing surface pushes the forward rotation pawl to swing to the corresponding avoidance position.

The beneficial effects are that: the cam is provided with a peripheral pushing surface, and the peripheral pushing surface of the cam pushes the corresponding pawl to swing to the avoiding position by rotating the cam, so that the cam is simple in structure.

As a further improvement, the cam is provided with a forward rotation blocking surface and a reverse rotation blocking surface on two sides of the peripheral pushing surface in the circumferential direction of the cam, the forward rotation blocking surface is located between the hinged end and the meshing end of the forward rotation pawl in the extending direction of the reverse rotation pawl, the reverse rotation blocking surface is located between the hinged section and the meshing end of the reverse rotation pawl in the extending direction of the reverse rotation pawl, when the switching shaft rotates to the forward rotation working position, the forward rotation blocking surface pushes and blocks the forward rotation pawl, and when the switching shaft rotates to the reverse rotation working position, the reverse rotation blocking surface pushes and blocks the reverse rotation pawl.

The beneficial effects are that: the stop surface of the cam is used for stopping and limiting the swing amplitude of the corresponding pawl, so that the corresponding engaging end of the corresponding pawl only exerts pushing acting force on the ratchet wheel in the circumferential direction, jacking acting force cannot be exerted on the corresponding side surface of the adjacent tooth in the radial direction of the ratchet wheel, the pressure of the engaging end of the two pawls on the radial direction of the ratchet wheel is reduced, and the service life of the ratchet wheel can be prolonged.

As a further improvement, a mounting cavity is arranged at the position of the rotation center of the outer ring driving part, a sealing cover is arranged on the left side surface of the outer ring driving part corresponding to the mounting cavity and used for packaging the forward rotation pawl, the reverse rotation pawl, the switching shaft and the nut body in the mounting cavity, the left ends of the forward rotation pawl, the reverse rotation pawl, the switching shaft and the nut body are hinged and assembled on the sealing cover, the right ends of the forward rotation pawl, the reverse rotation pawl, the switching shaft and the nut body are hinged and assembled on the outer ring driving part, the switching shaft is provided with an operating end penetrating out of the sealing cover leftwards, and the operating end is provided with an operating part used for an operator to drive the switching shaft to rotate between the forward rotation working position and the reverse rotation working position.

The beneficial effects are that: conveniently utilize installation cavity and closing cap to cooperate, realize corotation pawl, reversal pawl, switching shaft and the articulated assembly of nut body on outer ring initiative part, make the cam rotate through the operating portion simultaneously, the operating personnel of being convenient for operates labour saving and time saving.

As a further improvement, the outer ring driving part is a crank arm body, the crank arm body is provided with two transmission crank arms which are distributed along the circumferential direction of the outer ring driving part at intervals, and the synchronous transmission parts are respectively arranged between the two transmission crank arms on the opposite inner sides of any two adjacent nut structures in the circumferential direction of the corrugated pipe main body.

The beneficial effects are that: the crank arm body is provided with the transmission crank arm, so that the synchronous transmission part is conveniently connected with the outer ring driving part, the integral structure is simplified, and the transmission connection of two adjacent crank arm bodies is facilitated.

As a further improvement, the crank arm body is integrally V-shaped, two support arms of the V-shaped crank arm body form the two transmission crank arms, and the opening of the V-shaped crank arm body is arranged in the radial direction of the corrugated pipe main body and is opposite to the corrugated pipe main body.

The beneficial effects are that: the crank arm is designed into a V shape, the V-shaped opening is arranged back to the corrugated pipe main body in the radial direction of the corrugated pipe main body, the gap between the synchronous transmission piece and the corrugated pipe main body is increased, and the corrugated pipe main body is prevented from blocking the synchronous transmission piece.

The technical scheme of the pipeline bus provided by the utility model is as follows: a pipeline bus comprises two bus barrels which are arranged at intervals along the left-right direction, wherein the opposite ends of the two bus barrels are provided with connecting flanges; the pipeline bus also comprises a bellows expansion joint, the bellows expansion joint axially extends along the left and right directions, and two ends of the bellows expansion joint are fixedly connected with the connecting flanges at the opposite ends of the two bus cylinder bodies through flange connecting structures; the corrugated pipe expansion joint comprises a corrugated pipe main body, the axial direction of the corrugated pipe expansion joint extends along the left-right direction, a static end flange is arranged at the right end of the corrugated pipe main body, a moving end flange is arranged at the left end of the corrugated pipe main body, and the static end flange and the moving end flange are respectively used for being connected with bus tubes at two sides of the corrugated pipe main body in the axial direction; the corrugated pipe expansion joint for the pipeline bus further comprises at least two adjusting rods, each adjusting rod extends along the left-right direction, the left end of each adjusting rod is slidably assembled with the movable end flange in the left-right direction, and the right end of each adjusting rod is fixedly assembled with the static end flange; the adjusting rod is provided with an external thread section, a nut structure is arranged corresponding to the adjusting rod, the nut structures are spirally assembled on the adjusting rod, and the nut structures are used for pushing the movable end flange to move rightwards when the adjusting rod is screwed forwards so as to adjust the length of the bellows expansion joint; in the circumferential direction of the corrugated pipe main body, any two adjacent nut structures are in transmission connection through a synchronous transmission structure so as to realize synchronous rotation of all the nut structures, and when the nut structures rotate forwards synchronously, the nut structures move rightwards synchronously so as to compress the corrugated pipe main body synchronously; when the nut structures synchronously reverse, the nut structures move leftwards to synchronously release the corrugated pipe main body.

The beneficial effects are that: according to the pipeline bus provided by the utility model, the bus cylinders on two sides are connected through the corrugated pipe expansion joint, so that the bus is prevented from being expanded and damaged when being rigidly connected with the cabinet body, the nut structures are connected through the synchronous transmission structure by the corrugated pipe expansion joint, and the nut structures can synchronously rotate, so that the nut structures can synchronously move along the corresponding adjusting rods, and the movable end flange is always positioned in a plane vertical to the corrugated pipe main body in the moving process, so that the movable end flange cannot deflect, and is stressed uniformly, and the corrugated pipe expansion joint is not easy to damage.

Drawings

FIG. 1 is a schematic structural view of a bellows expansion joint according to the present invention;

FIG. 2 is a schematic structural view of the nut structure of FIG. 1;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is an exploded view of FIG. 2;

FIG. 5 is a cross-sectional view taken along line D-D of FIG. 2;

FIG. 6 is a schematic view of the bellows expansion joint;

fig. 7 is a side view of fig. 6.

Description of reference numerals: 1. a stationary end flange; 2. a moving end flange; 3. adjusting a rod; 31. an external threaded section; 4. a nut structure; 41. a crank arm body; 410. a transmission crank arm; 42. a mounting cavity; 421. a first counter-rotating slot; 422. a first limit slot hole; 43. sealing the cover; 431. a V-shaped groove; 432. fastening a bolt; 433. a second counter-rotating slot; 434. a switching shaft mounting hole; 435. a second limit slot hole; 44. a nut body; 441. a limiting part; 442. a ratchet wheel; 45. a reverse pawl; 450. a reverse pawl elastic member; 451. a reverse hinged end; 452. a reverse rotation engagement end; 46. a pawl is positively rotated; 460. a positive rotation pawl elastic member; 461. a positive rotation hinged end; 462. a positive rotation meshing end; 5. a manual operation part; 6. a transmission rod; 7. an operating handle; 8. a bellows body; 9. a steering switching structure; 91. a cam; 911. a peripheral push surface; 912. a reverse rotation stop face; 913. a positive rotation stop surface; 92. a switching shaft; 93. a reversing handle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise the element.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Example 1 of the pipe bus provided in the present invention:

bellows expansion joint among the prior art, in order to make bellows, flange, pull rod, adjusting bolt be evenly unlikely to the deformation damage at this in-process atress, need many people to operate adjusting bolt simultaneously usually or to each adjusting bolt symmetry slow regulation one by one, the step is loaded down with trivial details, wastes time and energy, and operating efficiency is not high, can't reach the effect of balanced atress completely moreover. The corrugated pipe expansion joint for the pipeline bus, provided by the utility model, has the advantages that the nut structures 4 sleeved on the adjusting rods 3 which are circumferentially arranged around the corrugated pipe main body 8 are in transmission connection through the transmission rod 6, so that the nut structures 4 can synchronously move along the axial direction of the corrugated pipe main body 8, the time and the labor are saved, and the nut structures 4 are always kept in the same plane which is axially vertical to the corrugated pipe main body 8 due to the synchronous movement of the nut structures 4, so that the corrugated pipe main body 8 is uniformly stressed and is not easy to damage when being compressed.

As shown in fig. 1 to 7, the pipe bus integrally includes two bus tube bodies (not shown in the drawings) coaxially disposed opposite to each other, and a bellows expansion joint is disposed between the two bus tube bodies for connecting the two bus tube bodies.

Bellows expansion joint includes bellows main part 8, and bellows main part 8 extends along left right direction, and the left end of bellows main part 8 is equipped with moves end flange 2, moves end flange 2 be used for with be located 8 left generating line barrel flange joint of bellows main part, and the right-hand member of bellows main part is equipped with quiet end flange 1, quiet end flange 1 be used for with be located 8 right sides generating line barrel flange joint.

In order to realize the movement of the movable end flange 2 and adjust the length of the corrugated pipe main body 8, four adjusting rods 3 are arranged between the movable end flange 2 and the static end flange, the four adjusting rods 3 are uniformly distributed along the circumferential direction of the corrugated pipe main body 8 at intervals, each adjusting rod 3 extends along the left-right direction, the right end of each adjusting rod 3 is fixedly connected with the static end flange 1, and the left end of each adjusting rod 3 is assembled with the movable end flange 2 in a sliding manner.

Each adjusting rod 3 is provided with an external thread section 31, the external thread section 31 is spirally assembled with a nut structure 4, any two adjacent nut structures 4 are in transmission connection through a synchronous transmission structure in the circumferential direction of the corrugated pipe main body 8 so as to realize synchronous rotation of all the nut structures 4, and when the nut structures 4 rotate forwards synchronously, the nut structures 4 move rightwards synchronously so as to push the movable end flange 2 to move rightwards, and further the corrugated pipe main body 8 is compressed synchronously; when the nut structures 4 synchronously rotate reversely, the nut structures 4 synchronously move leftwards, and at the moment, the nut structures 4 do not apply a rightward thrust to the moving end flange 2 so as to synchronously release the corrugated pipe main body 8.

The synchronous transmission structure comprises four transmission rods 6, the transmission rods 6 realize synchronous rotation of all nut structures as synchronous transmission parts, two ends of each transmission rod 5 are hinged to two nut structures 4 which are adjacent to each other in the circumferential direction of a corrugated pipe main body 8 respectively, each nut structure 4 is provided with a manual operation part 5 respectively, each manual operation part 5 is provided with a mounting groove, one of the nut structures 4 serves as a driving part, an operation handle 7 is inserted in the manual operation part 5 of the nut structure 4, and when the operation handle 7 is rotated, all the nut structures 4 are enabled to rotate synchronously.

In the present embodiment, the nut structure 4 includes a nut body 44 and a bidirectional overrunning clutch structure. The bidirectional overrunning clutch structure in this embodiment is an externally engaged ratchet-pawl clutch structure, which includes an outer ring driving portion, a forward rotation pawl 46, a reverse rotation pawl 45, a ratchet 442, and an inner shaft driven portion, where the ratchet 442 is mounted on the inner shaft driven portion, and in this embodiment, the inner shaft driven portion is integrally disposed with the nut body 44.

The normal rotation pawls 46 and the reverse rotation pawls 45 are arranged at intervals in the circumferential direction of the bellows main body 8. The forward rotation pawl 46 has a forward rotation hinge end 461 at the top thereof, and the forward rotation hinge end 461 is hinged to the outer ring driving portion. The forward rotation pawl 46 has a forward rotation engaging end 462 at a lower end thereof, the forward rotation engaging end 462 rotates around the forward rotation hinge end 461, and the forward rotation engaging end 462 is provided with a working position and an avoiding position in a rotation stroke. When the forward rotation engaging end 462 is in the working position, the forward rotation engaging end 462 is pressed against the tooth surface of the ratchet 442; the forward rotation engaging end 462 disengages the ratchet gear 442 when the forward rotation engaging end 462 is in the escape position.

A forward rotation pawl elastic member 460 is arranged between the forward rotation pawl 46 and the outer ring driving part, one end of the forward rotation pawl elastic member 460 is fixedly connected with the outer ring driving part, and the other end is fixedly connected with the forward rotation pawl 46 so as to apply an elastic acting force towards the reverse rotation pawl 45 to the forward rotation pawl 46, so that the forward rotation meshing end 462 of the forward rotation pawl 46 rotates to a corresponding working position.

The top of the reverse pawl 45 is a reverse hinged end 451, and the reverse hinged end 451 is hinged with the active part of the outer ring. The lower end of the reverse pawl 45 is a reverse engaging end 452, the reverse engaging end 452 rotates around the reverse hinged end 451, and the reverse engaging end 452 is provided with a working position and a avoiding position in a rotating stroke. When the reverse engaging end 452 is in the working position, the reverse engaging end 452 presses against the tooth surface of the ratchet 442; when the reverse engagement end 452 is in the escape position, the reverse engagement end 452 disengages the ratchet gear 442.

A reverse pawl elastic member 450 is arranged between the reverse pawl 45 and the outer ring active part, one end of the reverse pawl elastic member 450 is fixedly connected with the outer ring active part, and the other end is fixedly connected with the reverse pawl 45, so as to apply an elastic acting force towards the forward pawl 46 to the reverse pawl 45, and the reverse meshing end 452 of the reverse pawl 45 rotates to a corresponding working position.

A steering switching structure is arranged between the forward rotation pawl 46 and the reverse rotation pawl 45, the steering switching structure comprises a switching shaft 92 extending along the left-right direction, the switching shaft 92 is rotatably assembled on the outer ring driving part, and the switching shaft 92 is provided with a forward rotation working position and a reverse rotation working position on the rotation stroke.

The right end of the switching shaft 92 is provided with a cam 91, the cam 91 is positioned on one side of the forward hinged end 462 and the reverse hinged end 452 facing the ratchet 442, in the circumferential direction of the ratchet 442, the cam 91 is positioned between the forward pawl 46 and the reverse pawl 45, the cam 91 is provided with a peripheral pushing surface 911, the peripheral pushing surface 911 is of an arc-shaped structure, the arc top of the peripheral pushing surface 911 faces the two pawls, so that the switching shaft 92 is used for pushing the reverse pawl 45 to a corresponding avoidance position when in the forward working position and pushing the forward pawl 45 to the corresponding avoidance position when in the reverse working position.

A forward rotation blocking surface 913 and a reverse rotation blocking surface 912 are symmetrically arranged on the cam 91 with respect to the center of the outer peripheral pushing surface 911, and the forward rotation blocking surface 913 is a flat surface and is located between the forward rotation hinge end 461 and the forward rotation engagement end 462 of the forward rotation pawl 46; the reverse rotation stop surface 912 is a flat surface located between the reverse rotation hinge end 451 and the reverse rotation engagement end 452 of the reverse rotation pawl 45. When the switching shaft 92 rotates to the forward rotation working position, the forward rotation blocking surface 913 pushes and blocks the forward rotation pawl, so as to prevent the forward rotation engaging end 462 of the forward rotation pawl 46 from generating acting force on two adjacent tooth surfaces of the ratchet 442; when the switching shaft 92 rotates to the reverse rotation position, the reverse rotation blocking surface 912 pushes and blocks the reverse rotation pawl 45 to prevent the reverse rotation engaging end 452 of the reverse rotation pawl 45 from generating a force on two adjacent tooth surfaces of the ratchet 442. Thereby increasing the service life of the ratchet 442.

It should be explained that, when the forward rotation pawl 46 swings to the working position under the action of the forward rotation pawl elastic member 460, the forward rotation engaging end 462 of the forward rotation pawl 46 is used for pressing against the corresponding side surface of the tooth of the ratchet 442, and at this time, the forward rotation blocking surface 913 of the cam 91 is used for blocking and limiting the swing amplitude of the forward rotation pawl 46, so that the forward rotation engaging end 462 only exerts pushing acting force on the ratchet 442 in the circumferential direction, and does not exert pressing acting force on the corresponding side surface of the adjacent tooth in the radial direction of the ratchet 442, thereby reducing the pressure of the forward rotation engaging end 462 on the ratchet 442 in the radial direction, and further prolonging the service life of the ratchet 442.

The outer ring active part specifically is the connecting lever body 41, and connecting lever body 41 includes connecting lever body and closing cap 45, and the rotation center of connecting lever body is equipped with settles chamber 42, and the whole axial extension along bellows main part 8 of installation chamber 42 supplies nut body 44 to rotate the cartridge. In a plane perpendicular to the axial direction of the bellows main body 8, a first forward rotation groove and a first reverse rotation groove 421 are provided on the wall of the mounting chamber 42 at a left-right interval, and correspondingly, a second forward rotation groove and a second reverse rotation groove 433 are provided on the cover 43. The first forward rotation groove and the second forward rotation groove pair and form a forward rotation hinge hole for the forward rotation hinge end 460 to be assembled in a rotating manner, and the first reverse rotation groove 421 and the second reverse rotation groove 433 pair and form a reverse rotation hinge hole for the reverse rotation hinge end to be assembled in a rotating manner.

The overall shape of the cover 43 is matched with the opening of the mounting cavity 42 of the crank arm body 41, and the cover 43 is provided with a bolt mounting hole for being in bolt connection with the crank arm body 41 through a fastening bolt 432, so that the cover 43 is covered on the opening of the crank arm body 41 from left to right. The cover 43 has a V-shaped groove 431 on the left side surface thereof, and the V-shaped groove 431 provides a rotation space for the reversing lever 93. The bottom of the V-shaped groove 431 is provided with a switching shaft mounting hole 434, and the switching shaft mounting hole 434 extends in the front-rear direction so that the switching shaft 92 extends into the mounting cavity 42 from the front to the rear.

In order to enable each crank arm body 41 to move left and right on the corresponding adjusting rod 3 along with the nut body 44, the nut body 44 is a nut barrel, an annular limiting part 441 is convexly arranged on the outer circumferential surface of the nut barrel, and at the moment, the ratchet 442 is connected to the annular limiting part 441. The first limiting groove hole 422 is formed in the crank arm body 41, the second limiting groove hole 435 is formed in the sealing cover 43, the first limiting groove hole 422 and the second limiting groove hole 435 form a limiting hole in a combined mode, the diameter of the limiting hole is larger than that of the annular limiting portion 441 of the nut barrel so that the limiting portion 441 can be clamped, the diameter of the hole openings at the left end and the right end of the limiting hole is smaller than that of the annular limiting portion 441, the limiting portion 441 is prevented from sliding out of the hole openings, and the nut barrel and the crank arm body 41 are axially limited and mounted together, so that the crank arm body 41 can move along with the nut barrel.

In order to enable the crank arm bodies to rotate synchronously, in the embodiment, the crank arm body 41 is in a V-shaped structure, a V-shaped opening of the V-shaped crank arm body is arranged opposite to the corrugated pipe main body 8 in the radial direction of the corrugated pipe main body 8, and the V-shaped crank arm body 41 is provided with two support arms which form the transmission crank arm 410. In the circumferential direction of the corrugated pipe main body 8, a transmission rod 6 is respectively arranged between two transmission crank arms 410 on the opposite inner sides of any two adjacent crank arm bodies 41, two ends of the transmission rod 6 are respectively hinged with the two adjacent crank arm bodies 41, and then all the crank arm bodies 41 are connected together in a transmission way, so that the crank arm bodies 41 can synchronously rotate, and the length of each transmission rod 6 is adjustable, so that the corrugated pipe main body 8 with different diameters can be adapted.

When the corrugated pipe main body 8 needs to be compressed, each nut structure 4 needs to be driven to rotate in the forward direction so as to push the movable end flange 2 to move towards the right. When the reversing lever 93 is rotated to place the switching shaft 92 in the forward rotation position, the outer circumferential pushing surface 911 of the cam 91 pushes the reverse rotation pawl 45 to place the reverse rotation engaging end 452 of the reverse rotation pawl 45 in the corresponding avoiding position, and accordingly, the forward rotation stopping surface 913 of the cam 91 cooperates with the forward rotation pawl elastic member 460 to place the forward rotation engaging end 462 of the forward rotation pawl 46 in the corresponding working position.

Then the operating handle 7 is inserted into the mounting groove of the manual operating part 5, the operating handle 7 is pulled in a reciprocating manner, when the operating handle 7 is pulled in a forward direction, each crank arm body 41 rotates synchronously, when each crank arm body 41 rotates, the forward rotation engaging end 462 abuts against the ratchet 442 to rotate in a forward direction, when the ratchet 442 rotates, the nut barrel drives the crank arm body 41 to move towards the right, when the operating handle 7 is pulled in a reverse direction, each crank arm body 41 rotates synchronously in a reverse direction, when each crank arm body 41 rotates in a reverse direction, the forward rotation engaging end 462 is separated from the ratchet 442, and further, each crank arm body 41 intermittently pushes the moving end flange 2 to move towards the right.

When the bellows body 8 needs to be extended, each nut structure 4 needs to be driven to rotate reversely, so that each nut structure 4 gradually moves to the left. The reversing handle 93 is rotated in the reverse direction to make the switching shaft 92 in the reverse rotation working position, at this time, the outer circumference pushing surface 911 of the cam 91 pushes the forward rotation pawl 46 to make the forward rotation engaging end 462 of the forward rotation pawl 46 in the corresponding avoiding position, and correspondingly, the reverse rotation stopping surface 912 of the cam 91 is matched with the reverse rotation pawl elastic member 450 to make the reverse rotation engaging end 452 of the reverse rotation pawl 45 in the corresponding working position.

Then the operating handle 7 is pulled back and forth, when the operating handle 7 is pulled forward, each crank arm body 41 rotates, when each crank arm body 41 rotates, the reverse rotation engaging end 452 pushes the ratchet 442 to rotate reversely, when the ratchet 442 rotates, the nut barrel drives the crank arm body 41 to move leftward, when the operating handle 7 is pulled backward, each crank arm body 41 synchronously rotates reversely, when each crank arm body 41 rotates reversely, the reverse rotation engaging end 452 disengages from the ratchet 442, so that each crank arm body 41 intermittently moves leftward, and further, the bellows body 8 gradually recovers its deformation.

According to the pipeline bus provided by the utility model, the crank arm bodies are connected through the transmission rod, so that each crank arm body can synchronously rotate, each crank arm body can synchronously move along the corresponding adjusting rod, and the movable end flange is always positioned in a plane vertical to the corrugated pipe main body in the moving process, so that the movable end flange is not deflected, the stress of the movable end flange is balanced, and the movable end flange is not easy to damage; and moreover, the crank arm body is provided with the manual operation part, so that an operator can drive each crank arm body to synchronously rotate through the operation handle, and the operation is convenient.

Example 2 of the pipe bus provided in the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the outer ring active part of the external-engagement ratchet-pawl clutch structure is a crank arm body 41, each crank arm body 41 is provided with two transmission crank arms 410, a transmission rod 6 is arranged between any two adjacent crank arm bodies 41 in the circumferential direction of the bellows main body 8, and two ends of the transmission rod 6 are respectively hinged to the transmission crank arms 410 of the two adjacent crank arm bodies 41 to realize the synchronous rotation of the crank arm bodies 41. In the embodiment, the crank arm bodies are of a cylindrical structure, external teeth are arranged on the outer peripheral surfaces of the crank arm bodies of the cylindrical structure, a transmission belt is adopted, internal teeth are arranged on the inner peripheral surface of the transmission belt, the crank arm bodies are sleeved together through the transmission belt, the internal teeth of the transmission belt are meshed with the external teeth of the crank arm bodies, and then the belt is manually pulled to rotate around the circumference of the corrugated pipe main body in the positive and negative directions, so that synchronous positive and negative rotation of the crank arm bodies is realized.

In other embodiments, the outer circumferential surface of each cylindrical crank arm body is provided with a chain wheel, the crank arm bodies are connected through chain transmission, and when the chain rotates forwards and backwards, the forward and reverse rotation of the crank arm bodies is realized.

Example 3 of the pipe bus provided in the present invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, a transmission rod 6 is disposed between any two adjacent crank arm bodies 41 in the circumferential direction of the bellows main body 8, and both ends of the transmission rod 6 are respectively hinged to the transmission crank arms 410 of the two adjacent crank arm bodies 41, so as to realize synchronous rotation of the crank arm bodies 41. In the embodiment, in the circumferential direction of the corrugated pipe main body, the transmission crank arms of any two adjacent crank arm bodies are in transmission connection through the rigid pull rope, and when the operating handle is operated, each crank arm body realizes synchronous forward and reverse rotation through tensioning of the rigid pull rope.

Example 4 of the pipeline bus provided in the present invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the nut body 44 is a nut barrel, and the ratchet 442 is integrally provided on the outer peripheral surface of the nut barrel to form an inner shaft driven portion of the external engaging ratchet-pawl clutch structure. In this embodiment, the nut barrel is not provided with a ratchet wheel, the outer peripheral side of the nut barrel is sleeved with a ratchet wheel sleeve, the outer peripheral surface of the ratchet wheel sleeve is provided with the ratchet wheel, the ratchet wheel sleeve and the nut are relatively and fixedly assembled together, and at this time, the ratchet wheel sleeve is an inner shaft driven part of an external engagement type ratchet wheel-pawl clutch structure.

Example 5 of the pipe bus provided in the present invention:

the difference between the present embodiment and embodiment 1 is that in embodiment 1, a cam 91 is provided between the forward rotation pawl 46 and the reverse rotation pawl 45, a peripheral pushing surface 911 is provided on the cam 91, and by rotating the cam 91, the peripheral pushing surface 911 pushes the corresponding pawl, so that the pawl is disengaged from the ratchet 442. In this embodiment, the cam is not provided, two through holes are formed in the outer peripheral surface of the crank arm body corresponding to the two pawls, a positioning pull rope is arranged corresponding to the two through holes respectively, the positioning pull rope is inserted into the mounting cavity from the outside of the crank arm body and is connected with the corresponding pawl, positioning columns are arranged on the outer peripheral surface of the crank arm beside the through holes, the corresponding positioning pull rope is pulled, the pulled pawl is separated from the ratchet wheel, and then the pull rope is wound on the corresponding positioning columns.

Example 6 of the pipe bus provided in the present invention:

the present embodiment is different from embodiment 1 in that each of the crank arm bodies 41 is V-shaped in embodiment 1. In the present embodiment, each crank arm body is in a straight shape, a transmission rod is disposed between any two adjacent crank arm bodies in the straight shape in the circumferential direction of the bellows main body, and two ends of the transmission rod are respectively hinged to two ends of the two crank arm bodies.

Example 7 of the pipe bus provided in the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the outer ring driving part of the external-engagement ratchet-pawl clutch structure is a crank arm body 41. In the embodiment, the driving part of the outer ring of the externally engaged ratchet-pawl clutch structure is a cylinder, the cylinder is provided with a mounting cavity, the forward pawl, the reverse pawl, the nut body, the steering switching structure and the corresponding elastic piece are arranged in the mounting cavity, the cavity opening of the mounting cavity is sealed by the sealing cover, in the circumferential direction of the corrugated pipe body, the cylinders are connected through a rigid pull rope, a plurality of circles of rigid pull ropes are wound on the outer circumferential surface of each cylinder, one end of each rigid pull rope is fixedly connected with one of the cylinders, the other end of each rigid pull rope is a free end and serves as a pulling end, when an operator pulls the pulling end, the rigid pull rope is tensioned through movement to drive the cylinders to rotate forwards synchronously, when an operator does not apply pulling force, the cylinders fixedly connected with the rigid pull ropes can rotate reversely to drive the rigid pull ropes to move reversely, so that the cylinders rotate reversely synchronously.

Example 8 of the pipe bus provided in the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the crank arm body 41 is provided with a mounting cavity 42, a forward rotation pawl 46, a reverse rotation pawl 45, a nut body 44, a steering switching structure and a corresponding elastic member are mounted in the mounting cavity 42, and the opening of the mounting cavity 42 is sealed by a sealing cover 43. In the embodiment, the sealing cover is not arranged, the crank arm body is integrally divided into a left part and a right part, grooves are arranged in the crank arm bodies of the two parts, and the arrangement grooves of the two half crank arm bodies are aligned to form an arrangement cavity for installing the forward rotation pawl, the reverse rotation pawl, the nut body, the steering switching structure and the corresponding elastic piece.

Example 9 of the pipe bus provided in the present invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the cam 91 is provided with a forward rotation blocking surface 913 and a reverse rotation blocking surface 912, the forward rotation blocking surface 913 prevents the forward rotation engaging end 462 of the forward rotation pawl 46 from simultaneously pressing both side tooth surfaces of the ratchet wheel 442, and the reverse rotation blocking surface prevents the forward rotation engaging end 452 of the forward rotation pawl 45 from simultaneously pressing both side tooth surfaces of the ratchet wheel 442. In the present embodiment, the cam is not provided with the forward rotation stop surface and the reverse rotation stop surface, and accordingly, the service life of the ratchet wheel is shortened.

Example 10 of the pipe bus provided in the present invention:

the present embodiment is different from embodiment 1 in that, in embodiment 1, the bidirectional overrunning clutch is configured as an externally engaged ratchet-pawl bidirectional overrunning clutch. In this embodiment, the bidirectional overrunning clutch structure is a wedge type overrunning clutch structure, and the wedge type overrunning clutch structure includes an outer ring driving part, an inner shaft driven part and a wedge.

The outer ring driving part is a driving cylinder, a plurality of driving arc grooves are formed in the inner circumferential surface of the driving cylinder, and the driving arc grooves are arranged at intervals in the circumferential direction of the driving cylinder. The inner shaft driven part is a driven cylinder, a plurality of driven arc grooves are formed in the outer peripheral surface of the driven cylinder, the number of the driven arc grooves is consistent with that of the driving arc grooves, the driven arc grooves are arranged at intervals in the circumferential direction of the driven cylinder, and internal threads are formed in the inner peripheral surface of the driven cylinder so as to be in spiral assembly with the corresponding adjusting rod.

The coaxial suit of initiative drum is outside driven drum, and the diameter of initiative drum is greater than driven drum diameter, is equipped with a plurality of voussoirs in the annular gap of initiative drum and driven drum, and voussoir quantity is the same with initiative arc groove quantity, and each voussoir arranges in the annular gap slant, and the voussoir is equipped with initiative working face towards the one end of initiative drum, and initiative working face and initiative arc groove laminating, and the voussoir is equipped with driven working face towards the one end of driven drum, and driven working face and driven arc groove laminating. The wedges are connected through an annular retainer, the middle part of each wedge is hinged with the retainer, and the annular retainer can rotate in the annular gap.

And rotating the annular retainer to enable each wedge block to extend obliquely, rotating the driving cylinder in a forward direction, pushing the driven working surface of each wedge block against the driven cylinder to rotate in the forward direction when the driving cylinder rotates, and separating the driven working surface from the driven arc groove when the driving cylinder rotates in a reverse direction. And repeating the process to enable the driven cylinder to drive the driving cylinder to intermittently move along the corresponding adjusting rod.

And the annular retainer is rotated reversely, so that each wedge block rotates around the hinge shaft of the annular retainer and the hinge shaft of the annular retainer, the obliquely extending direction of each wedge block is a mirror image of the previous obliquely extending direction, at the moment, the driving cylinder is rotated forwardly, when the driving cylinder rotates, the driven working surface of each wedge block is abutted against the driven cylinder to rotate reversely, and when the driving cylinder rotates reversely, the driven working surface is separated from the driven arc groove. And repeating the process to enable the driven cylinder to drive the driving cylinder to intermittently and reversely move along the corresponding adjusting rod.

Example 11 of the pipe bus provided in the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, each arm body 41 is provided with a manual operation portion 5, an operation handle 7 is inserted into an installation groove of the manual operation portion 5, and the arm bodies 41 are rotated synchronously by pulling the operation handle 7. In the embodiment, each crank arm body is not provided with a manual operation part, a handle is arranged on one of four transmission rods for connecting any two adjacent crank arm bodies in a transmission manner in the circumferential direction of the corrugated pipe main body, and the handle is lifted upwards to enable the two crank arm bodies hinged with the transmission rods to rotate, so that each crank arm body synchronously rotates; the handle is pressed down, so that the two crank arm bodies hinged with the transmission rod rotate reversely, and further, each crank arm body rotates reversely synchronously.

In this embodiment, the handle is disposed on the transmission rod, and the manual operation portion may be disposed on the synchronous transmission structure, and of course, along with the difference of the synchronous transmission structure, for example, when the synchronous transmission structure adopts the inelastic retractable pull rope as the synchronous transmission member, a pull ring may be disposed on the pull rope to drive the synchronous transmission structure to move, so as to drive all the crank arm bodies to rotate synchronously.

Example 12 of the pipe bus provided in the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the crank arm bodies 41 of each nut structure are provided with manual operation portions 5, the operation handle 7 is inserted into an installation groove of the manual operation portion 5, and the crank arm bodies 41 are rotated synchronously by pulling the operation handle 7. In this embodiment, the nut structure includes a nut barrel, an internal thread is provided on an inner peripheral surface of the nut barrel for corresponding screw assembly with the adjusting lever, two rings of gears are provided on an outer peripheral surface of the nut barrel, the two rings of gears are axially spaced along the nut barrel, one of the rings of gears is a driven gear, the other ring of gears is a synchronous rotating gear, a synchronous transmission belt with internal teeth is provided, the synchronous transmission belt is arranged around the bellows body, and the internal teeth of the synchronous transmission belt are engaged with the synchronous rotating gears of the nut barrels.

Correspond one of them nut section of thick bamboo at the moving end flange and be provided with the mounting bracket, the mounting bracket extends along controlling the direction, the direction is equipped with the motor mount pad on the mounting bracket, fixed mounting has the motor on the motor mount pad, the driving gear has set firmly on the output shaft of motor, driven gear meshing transmission on driving gear and the corresponding turning arm body, and, the motor mount pad passes through linkage plate and turning arm body about the direction relative positioning assembly, linkage plate and motor mount pad fixed assembly, rotate the assembly through bearing structure and corresponding nut section of thick bamboo on the linkage plate, and simultaneously, linkage plate and nut section of thick bamboo about the direction location assembly, and then make along the nut section of thick bamboo that controls the direction removal move about through corresponding linkage plate synchronous drive motor.

When the motor shaft rotates, the driving gear drives the corresponding nut barrels to rotate, the nut barrels drive all the nut barrels to synchronously rotate through the transmission belt, when the nut barrels rotate, the nut barrels move left and right along the corresponding adjusting rods, and when the nut barrels move left and right, the nut barrels drive the motor to move left and right through the bearing structure, the linkage plate and the mounting frame.

The utility model also provides an embodiment of the bellows expansion joint for the pipeline bus, which comprises the following steps:

the bellows expansion joint structure for the pipe bus in this embodiment is the same as the bellows expansion joint structure in the pipe bus embodiment 1, and details are not described here.

Of course, in other embodiments, the bellows expansion joint for the pipe bus may also be the structure of the bellows expansion joint in any embodiment of embodiments 2 to 12 of the pipe bus, and will not be described herein again.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.

Claims

1. A corrugated pipe expansion joint for a pipeline bus comprises a corrugated pipe main body (8), wherein the axial direction of the corrugated pipe main body extends along the left-right direction, a static end flange (1) is arranged at the right end of the corrugated pipe main body (8), a moving end flange (2) is arranged at the left end of the corrugated pipe main body, and the static end flange (1) and the moving end flange (2) are respectively used for being connected with bus barrels at two axial sides of the corrugated pipe main body (8); the corrugated pipe expansion joint for the pipeline bus further comprises at least two adjusting rods (3), each adjusting rod (3) extends along the left-right direction, the left end of each adjusting rod (3) is slidably assembled with the movable end flange (2) in the left-right direction, and the right end of each adjusting rod is fixedly assembled with the static end flange (1); the adjusting rod (3) is provided with an external thread section (31), the adjusting rod (3) is provided with a nut structure (4) correspondingly, the nut structures (4) are assembled on the adjusting rod (3) in a spiral mode respectively, and the nut structures (4) are used for pushing the movable end flange (2) to move rightwards when the adjusting rod is screwed in the forward direction so as to adjust the length of the bellows telescopic joint; the method is characterized in that: in the circumferential direction of the corrugated pipe main body (8), any two adjacent nut structures (4) are in transmission connection through a synchronous transmission structure so as to realize synchronous rotation of all the nut structures (4), and when the nut structures (4) rotate forwards synchronously, the nut structures (4) move rightwards synchronously so as to synchronously compress the corrugated pipe main body (8); when the nut structures (4) synchronously reverse, the nut structures (4) move leftwards to synchronously release the corrugated pipe main body (8).

2. Bellows expansion joint for a pipe bus according to claim 1, wherein the nut structure (4) comprises a nut body (44), the nut body (44) is used for being spirally assembled on the corresponding adjusting rod (3), the nut structure (4) also comprises a bidirectional overrunning clutch structure, the bidirectional overrunning clutch structure comprises an outer ring driving part and an inner shaft driven part, the inner shaft driven part and the nut body (44) are integrally arranged or fixedly assembled in a split way, the synchronous transmission structure comprises a synchronous transmission piece, the synchronous transmission parts are respectively arranged between the outer ring driving parts of any two adjacent nut structures (4) in the circumferential direction of the corrugated pipe main body (8) so as to drive the outer ring driving parts of all the nut structures (4) to synchronously rotate forwards and reversely, the nut body (44) is driven to rotate intermittently in the forward direction and intermittently in the reverse direction by the corresponding bidirectional overrunning clutch structure.

3. The bellows expansion joint for the pipeline bus according to claim 2, wherein the bidirectional overrunning clutch structure is an externally engaged ratchet-pawl clutch structure, a ratchet (442) is disposed on an inner shaft driven portion of the externally engaged ratchet-pawl clutch structure, a forward pawl (46) and a reverse pawl (45) are hinged on an outer ring driving portion, a working position for engaging with the ratchet (442) and an avoidance position for disengaging from the ratchet (442) are respectively disposed on swing strokes of the forward pawl (46) and the reverse pawl, a pawl elastic member is disposed on the outer ring driving portion for applying an elastic acting force to the forward pawl (46) and the reverse pawl (45) to force the corresponding pawls to swing towards the corresponding working positions, a steering switching structure (9) is further disposed on the outer ring driving portion, and the steering switching structure (9) is used for switching and driving the forward pawl (46) and the reverse pawl (45) to swing towards the corresponding avoidance positions The steering switching structure is used for driving the reverse rotation pawl (45) to swing towards the corresponding avoidance position to disengage from the ratchet wheel (442) when the forward rotation pawl (46) is meshed with the ratchet wheel (442), and the steering switching structure is used for driving the forward rotation pawl (46) to swing towards the corresponding avoidance position to disengage from the ratchet wheel (442) when the reverse rotation pawl (45) is meshed with the ratchet wheel (442).

4. The bellows expansion joint for a pipe bus according to claim 3, wherein the steering switching mechanism (9) includes a switching shaft (92) extending in a left-right direction, the switching shaft (92) is rotatably mounted on the outer ring driving portion, a cam (91) is provided on the switching shaft (92), the cam (91) is used for pushing the forward pawl (46) and the reverse pawl (45) to swing to the corresponding avoidance position, the switching shaft (92) has a forward working position and a reverse working position on a rotation stroke thereof, the switching shaft (92) is used for pushing the reverse pawl (45) to the corresponding avoidance position when the switching shaft (92) is in the forward working position, and the switching shaft (92) is used for pushing the forward pawl (46) to the corresponding avoidance position when the switching shaft (92) is in the reverse working position.

5. The bellows expansion joint for pipe bus according to claim 4, wherein the normal rotation pawl (46) and the reverse rotation pawl (45) have a hinge end for hinge-connecting to the outer ring driving part and an engagement end for engagement with a ratchet (442), respectively, the cam (91) is located on a side of the hinge end of the normal rotation pawl (46) and the reverse rotation pawl (45) facing the ratchet (442) in a radial direction of the ratchet (442), the cam (91) is located between the normal rotation pawl (46) and the reverse rotation pawl (45) in a circumferential direction of the ratchet (442), the cam (91) has a peripheral push surface (911), the peripheral push surface (911) pushes the reverse rotation pawl (45) to swing to a corresponding avoidance position when the switching shaft (92) is rotated to the normal rotation working position, and when the switching shaft (92) is rotated to the reverse rotation working position, the peripheral pushing surface (911) pushes the forward rotation pawl (46) to swing to a corresponding avoidance position.

6. The bellows expansion joint for a pipe bus according to claim 5, wherein the cam (91) is provided with a normal rotation stopper surface (913) and a reverse rotation stopper surface (912) on both sides of the outer peripheral pushing surface (911) in a circumferential direction of the cam (91), in the extending direction of the forward rotation pawl (46), a forward rotation stopper surface (913) is located between the hinge end and the engagement end of the forward rotation pawl (46), in the extending direction of the reverse pawl (45), the reverse stop surface (912) is located between the hinge section and the engaging end of the reverse pawl (45), when the switching shaft (92) rotates to the forward rotation working position, the forward rotation blocking surface (913) pushes and blocks the forward rotation pawl (46), when the switching shaft (92) rotates to the reverse rotation working position, the reverse rotation blocking surface (912) pushes and blocks the reverse rotation pawl (45).

7. The bellows expansion joint for pipe bus according to claim 4, 5 or 6, wherein a mounting cavity (42) is provided at a rotation center position of the outer ring driving portion, a sealing cover (43) is provided on a left side surface of the outer ring driving portion corresponding to the mounting cavity (42), the sealing cover (43) seals the forward rotation pawl (46), the reverse rotation pawl (45), the switching shaft (92) and the nut body (44) in the mounting cavity, left ends of the forward rotation pawl (46), the reverse rotation pawl (45), the switching shaft (92) and the nut body (44) are hinge-mounted on the sealing cover (43), right ends of the forward rotation pawl (46), the reverse rotation pawl (45), the switching shaft (92) and the nut body (44) are hinge-mounted on the outer ring driving portion, the switching shaft (92) has an operation end penetrating the sealing cover (43) leftward, the operation end is provided with an operation part for an operator to drive the switching shaft (92) to rotate between the forward rotation working position and the reverse rotation working position.

8. The bellows expansion joint for a pipeline bus according to any one of claims 2 to 6, wherein the outer ring driving portion is a crank arm body (41), the crank arm body (41) has two transmission crank arms (410) distributed at intervals along the circumferential direction of the outer ring driving portion, and the synchronous transmission members are respectively arranged between the two transmission crank arms (410) on the inner sides of any two nut structures (4) adjacent to each other in the circumferential direction of the bellows main body (8).

9. The bellows expansion joint for a pipe bus according to claim 8, wherein the crank arm body (41) is V-shaped as a whole, two arms of the V-shaped crank arm body (41) form the two transmission crank arms (410), and an opening of the V-shaped crank arm body (41) is arranged in a radial direction of the bellows main body (8) away from the bellows main body (8).

10. A pipeline bus comprises two bus barrels which are arranged at intervals along the left-right direction, wherein the opposite ends of the two bus barrels are provided with connecting flanges; the pipeline bus also comprises a bellows expansion joint, the bellows expansion joint axially extends along the left and right directions, and two ends of the bellows expansion joint are fixedly connected with the connecting flanges at the opposite ends of the two bus cylinder bodies through flange connecting structures; the bellows expansion joint is the bellows expansion joint for a pipe bus according to any one of claims 1 to 9.