Variable-diameter power joint capable of adjusting movement speed of detector in pipeline

Abstract

A variable-diameter power joint capable of adjusting the movement speed of a detector in a pipeline comprises a flow discharge shell, a variable-diameter leather cup assembly and a flow discharge valve, four flow inlet holes are formed in the rear end of the flow discharge shell, four flow outlet holes are formed in the front end of the flow discharge shell, a flow guide channel is formed in the flow discharge shell, and a universal joint connecting device is arranged at the tail of the flow discharge shell; a discharge valve is arranged in the discharge shell and mainly composed of four conical flow limiting valves, the discharge valve is fixed into the discharge shell through a valve hinge support, and the opening degree of the flow limiting valves is controlled by adjusting a first pressing rod to stretch out and draw back on the basis of pressure changes of fluid in a flow guide channel on the conical flow limiting valves. Therefore, the running speed of the power joint is controlled; leather cup assemblies are arranged at the front end and the rear end of the drainage shell, a leather cup at the front end is provided with a reducing auxiliary device, and when the power joint passes through a reducing pipeline or a bent pipeline, the leather cup reducing auxiliary device can adapt to the curvature change of the pipeline in time, so that the leather cup at the front end is attached to the inner wall of the pipeline all the time, blocking is avoided, and meanwhile an inner detector is assisted in turning.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline detection equipment field especially, it relates to a variable diameter power section that adjustable pipeline internal detector motion speed. BACKGROUND

[0002] To guarantee long -distance pipeline transportation efficiency and transportation safety, need to carry out internal detection operation to pipeline regularly. In recent years, with the popularization and application of clean energy, the demand of natural gas and the like is increasing day by day, and long-distance gas pipeline generally has the characteristics of large caliber, large capacity and high pressure. In this way, the flow rate of natural gas transported by pipeline is greatly improved, for example, the fastest flow rate of natural gas in the pipeline can reach or exceed 10 m / s.

[0003] However, in the detection process, if the running speed of the internal detector is too high, the probe of the internal detector will miss detection when scanning. If the running speed of the internal detector is too low, the efficiency of the inspection will be reduced, resulting in a waste of a large amount of manpower and material resources. Therefore, the running speed of the internal detector in the pipeline must be kept stable.

[0004] The pipeline internal detector speed regulating device (publication number CN115436463A) provides a technical solution for reducing the speed of the internal detector by changing the friction force, specifically by a torque motor driving a piston with high wear-resistant rubber to extrude the pipe wall. However, in high-pressure pipelines (such as 4Mpa), the gas pushing force is as high as tens of tons or even hundreds of tons, and simply increasing the friction force not only has poor deceleration effect, but also has the risk of damaging the pipeline.

[0005] The above information disclosed in the background section is only used to strengthen the understanding of the background of the utility model, so it can include information that does not constitute prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at overcoming the shortcomings of the prior art, and provides a variable diameter power section capable of self-adaptively adjusting the motion speed of a pipeline internal detector, which can realize precise control of pressure relief without motor driving.

[0007] The additional aspects and advantages of the utility model will be partially described in the following description, and partially become apparent from the description, or can be learned through the practice of the utility model.

[0008] To solve the above problems, the utility model adopts the following technical scheme:

[0009] A variable diameter power section capable of adjusting the motion speed of a pipeline internal detector, comprising:

[0010] A drain casing 1, which is a cylindrical structure, is internally provided with a flow guide channel 16 for medium flow, and is provided with an inflow hole 12 at the axial rear end and an outflow hole 13 at the axial front end, which are communicated through the flow guide channel 16.

[0011] A leather cup assembly 2, which is a circular truncated cone structure, includes a front leather cup 21 and a rear leather cup 22, which are distributed at the front end and the rear end of the axial direction of the drain casing 1, and the front leather cup 21 is provided with a variable-diameter auxiliary device 23.

[0012] A drain valve 3, which is a square cone structure, is coaxially arranged at the top of the square cone structure and the central axis of the drain casing 1, and mainly consists of four conical flow limiting valves 32, which are fixed in the drain casing 1 by a valve hinge support 33.

[0013] When the pipe curvature radius changes, the variable-diameter power joint timely adapts to the change of the pipe curvature under the action of the variable-diameter auxiliary device 23, so that the front leather cup 21 always adheres to the inner wall of the pipe.

[0014] Further, the drain casing 1 comprises:

[0015] A drain casing body 11;

[0016] A collision avoidance device 15 arranged at the front end of the drain casing body 11;

[0017] Four inflow holes 12 arranged at the rear side of the rear leather cup 22 in the circumferential direction, and the two inflow holes 12 are separated by 90°.

[0018] Four outflow holes 13 arranged at the front side of the front leather cup 21 in the circumferential direction, and the two outflow holes 13 are separated by 90°.

[0019] A universal joint connecting device 14 arranged at the rear end of the drain casing body 11 and closely matched with the flow guide channel 16;

[0020] A flow guide channel 16 located between the collision avoidance device 15 and the universal joint connecting device 14.

[0021] Further, the collision avoidance device 15 comprises:

[0022] A collision avoidance head 151 arranged at the front end of the collision avoidance device 15;

[0023] A flow guide plate 152 fixedly arranged at the rear end of the collision avoidance head 151 and located in the flow guide channel 16, which closely matches the flow guide channel 16, and the flow guide plate 152 is a 45° square cone structure.

[0024] Furthermore, the universal joint connection device 14 includes:

[0025] Four circumferential limiting holes 141 are circumferentially arranged on the universal joint connecting device 14, with the interval between the two circumferential limiting holes being 90°.

[0026] The connecting hole 142 is located in the middle of the circumferential limiting hole 141.

[0027] Furthermore, the leather cup assembly 2 includes:

[0028] The front end cup 21 is located behind the outlet hole 13;

[0029] The rear end cup 22 is located in front of the inlet hole 12;

[0030] The diameter-changing auxiliary device 23 is fitted to the rear end face of the front end cup 21.

[0031] Furthermore, the variable diameter auxiliary device 23 includes:

[0032] The linear track bracket 231 is axially mounted on the drain housing body 11, with its front end attached to the front end cup 21. There are 8 brackets arranged circumferentially, with each pair spaced at 45° apart.

[0033] Elastic element 232 is disposed on the linear track support 231;

[0034] The telescopic mechanism 233 is connected to the front end of the linear track support 231 and the elastic element 232.

[0035] Furthermore, the linear track support 231 includes:

[0036] The first track support 2311 has its front end attached to the front end cup 21, its bottom end in an arc shape attached to the outer wall of the drain housing body 11, and its top is provided with a hinge connection device for the connecting rod 2331.

[0037] The second track support 2312 has an arc-shaped bottom that fits into the outer wall of the drain housing body 11;

[0038] A linear track 2313 is disposed between the first track support 2311 and the second track support 2312.

[0039] Furthermore, the elastic element 232 includes:

[0040] The sliding slider 2323 is sleeved on the linear track 2313 and can move axially along the linear track 2313. The upper part of the sliding slider 2323 is provided with a hinge connection device for the first pressure rod 2332.

[0041] The first elastic member 2321 is sleeved on the linear track 2313, and the left end is fixed on the first track support 2311, and the right end is fixed on the right end of the sliding block 2323.

[0042] The second elastic member 2322 is sleeved on the linear track 2313, and the left end is fixed on the left end of the sliding block 2323, and the right end is fixed on the second track support 2312.

[0043] Further, the telescopic mechanism 233 comprises:

[0044] The skin bowl patch 2333 is attached to the inner wall of the front end skin bowl 21, and the middle part is provided with the hinge connection device of the first pressure rod 2332 and the connecting rod 2331;

[0045] The connecting rod 2331 is connected with the hinge connection device on the first track support 2311 at the lower end, and connected with the hinge connection device on the skin bowl patch 2333 at the upper end;

[0046] The first pressure rod 2332 is connected with the hinge connection device on the sliding block 2323 at the lower end, and connected with the hinge connection device on the skin bowl patch 2333 at the upper end.

[0047] Further, the flow relief valve 3 comprises:

[0048] The valve hinge support 33 is circumferentially arranged on the inner wall of the flow relief housing body 11, and one is arranged on the upper part, the lower part, the left part and the right part, and the upper end of the valve hinge support 33 is provided with a hinge sleeve;

[0049] The frame type hinge connection member 34 passes through the hinge sleeve on the valve hinge support 33 and the conical flow limiting valve 32, so that the valve hinge support 33 and the conical flow limiting valve 32 are rotationally connected;

[0050] The conical flow limiting valve 32 is provided with a hinge sleeve at the lower end, and the outer surface of the conical flow limiting valve 32 is provided with the hinge connection device of the second pressure rod 31;

[0051] The second pressure rod 31 is connected with the hinge connection device on the conical flow limiting valve 32 at the lower end, and connected with the hinge connection device on the inner wall of the flow relief housing body 11 at the upper end.

[0052] From the above technical scheme, the advantages and positive effects of the utility model are that:

[0053] The utility model relates to a variable-diameter power joint capable of adjusting the motion speed of an inner detector in a pipeline, compared with the original inner detector power joint incapable of adjusting the operation speed or adjusting the operation speed through a gear, the utility model can adjust the opening degree of the drain valve according to the pressure of the fluid in the flow guide channel through the simultaneous action of the four conical drain valves in the drain valve, can quickly adjust the drain flow of the medium in the flow guide channel, so that the pressure difference between the front end and the rear end of the power joint can be changed, the operation speed of the power joint can be adjusted, and in addition, the utility model is also matched with a leather cup variable-diameter auxiliary device, which can make the leather cup adapt to the curvature change of the pipeline quickly when the power joint encounters an elbow pipe or a variable-diameter pipeline, make the leather cup always adhere to the pipe wall, and avoid the power joint from being blocked. BRIEF DESCRIPTION OF DRAWINGS

[0054] The above and other features and advantages of the utility model will become more apparent by describing in detail example implementation manners with reference to the accompanying drawings.

[0055] Figure 1 It is the whole structure schematic diagram of the utility model.

[0056] Figure 2 It is the whole structure isometric drawing of the utility model.

[0057] Figure 3 It is the half cutaway view of the utility model.

[0058] Figure 4 It is another whole three-dimensional structure schematic diagram of the utility model.

[0059] Figure 5 It is the drain casing structure schematic diagram of the utility model.

[0060] Figure 6 It is the leather cup variable-diameter auxiliary device structure schematic diagram of the utility model.

[0061] Figure 7 It is the drain valve structure schematic diagram of the utility model.

[0062] Figure 8 It is the schematic diagram of the drain valve under the open state of the utility model.

[0063] Figure 9 It is the schematic diagram of the drain valve under the closed state of the utility model.

[0064] Figure 10 It is the schematic diagram of the hinge sleeve of the utility model.

[0065] In the figure: 1 - the flow shell; 11 - the flow shell body; 12 - the flow hole; 13 - the outflow hole; 14 - the universal joint connecting device; 141 - the circumferential limiting hole; 142 - the connecting hole; 15 - the anti-collision device; 151 - the anti-collision head; 152 - the guide plate; 16 - the guide channel; 2 - the leather cup assembly; 21 - the front leather cup; 22 - the rear leather cup; 23 - the variable diameter auxiliary device; 231 - the linear rail support; 2311 - the first rail support; 2312 - the second rail support; 2313 - the linear rail; 232 - the elastic member; 2321 - the first elastic member; 2322 - the second elastic member; 2323 - the sliding slider; 233 - the telescopic mechanism; 2331 - the connecting rod; 2332 - the first pressing rod; 2333 - the leather cup patch; 3 - the flow valve; 31 - the second pressing rod; 32 - the conical flow limiting valve; 33 - the valve hinge support; 34 - the frame type hinge connecting member.

[0066] In the present application, all the drawings are schematic drawings, which are only used to illustrate the principles of the utility model and are not drawn according to the actual proportion. DETAILED DESCRIPTION

[0067] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0068] As Figures 1 to 4 shown, the utility model discloses a variable diameter power joint of adjustable pipeline internal detector movement speed, including:

[0069] The flow shell 1 is provided with four flow holes 12 at the rear end and four outflow holes 13 at the front end, and is internally provided with a guide channel 16 and a universal joint connecting device 14 at the tail;

[0070] The flow valve 3 is arranged in the flow shell 1, and the flow valve 3 is composed of four conical flow limiting valves 32, is fixed in the flow shell 1 through a valve hinge support 33, and adjusts the opening degree of the conical flow limiting valve 32 by adjusting the telescopic of the second pressing rod 31 based on the pressure change of the fluid in the guide channel 16 to the conical flow limiting valve 32;

[0071] Variable diameter leather cup assembly 2, the front end leather cup 21 and the rear end leather cup 22 are arranged at the front end and the rear end of the leakage housing 1, the front end leather cup 21 is equipped with a variable diameter auxiliary device 23, when the power section passes through the variable diameter pipeline or the curved pipeline, the leather cup variable diameter auxiliary device 23 can adapt to the curvature change of the pipeline in time, so that the front end leather cup 21 always adheres to the inner wall of the pipeline.In the scheme, the leakage housing 1 belongs to a part of the internal detector, a square flow guide channel 16 is cut out in the originally solid leakage housing 1, and the advantage of the arrangement is that in the case that the power section leather cup does not leak, fluid is discharged through the flow guide channel 16.

[0072] As shown in Figure 7 The leakage valve 3 in the scheme is arranged in the flow guide channel 16, and one valve hinge support 33 and one tapered flow limiting valve 32 are arranged on the upper, lower, left and right four surfaces in the leakage housing body 11,

[0073] In order to illustrate the specific structure of the leakage valve 3, the utility model adopts the leakage valve 3 comprising:

[0074] The valve hinge support 33 is circumferentially arranged on the inner wall of the leakage housing 1, and one is arranged on the upper part, the lower part, the left part and the right part respectively, the valve hinge support 33 is circumferentially arranged on the inner wall of the leakage housing body 11, and one is arranged on the upper part, the lower part, the left part and the right part respectively, and the upper end of the valve hinge support 33 is provided with a hinge sleeve; the frame type hinge connecting member 34 passes through the hinge sleeves on the valve hinge support 33 and the tapered flow limiting valve 32, so that the valve hinge support 33 and the tapered flow limiting valve 32 are rotationally connected;

[0075] The tapered flow limiting valve 32 is provided with a hinge connecting device of the second pressure rod 31 on the outer surface;

[0076] The second pressure rod 31 is connected with the hinge connecting device on the tapered flow limiting valve 32 at the lower end, and is connected with the hinge connecting device on the inner wall of the leakage housing body 11 at the upper end.

[0077] As shown in Figure 9 In the scheme, the second pressure rod 31 is circumferentially arranged and connected with the tapered leakage valve 3 door and the leakage housing 1 through the hinge connecting device, the tapered leakage valve 3 door is connected with the valve hinge support 33 through the frame type hinge connecting member 34, and the valve hinge support 33 is fixed in the leakage housing 1 through a pin, when the pressure difference between the front and rear of the power section becomes large, the pressure on the tapered leakage valve 3 door becomes large, so that the second pressure rod 31 is compressed, so that the leakage valve 3 door is opened, the leakage of the medium in the flow guide channel 16 is quickly adjusted, so that the pressure difference between the front and rear of the power section can be changed, and the function of adjusting the running speed of the power section is realized.

[0078] As shown in Figure 8As shown, when the power section front and rear pressure difference decreases, the pressure of the conical flow limiting valve 32 becomes smaller, the second pressure rod 31 releases pressure and extends to drive the conical flow limiting valve 32 to close, thereby realizing the function of high pressure discharge and low pressure closing.

[0079] As shown in Figure 2 and Figure 6 In the scheme, the skin bowl belongs to a part of the power section, is set to a circular table shape, and is directly connected to the outside of the body of the discharge shell 1. The advantage is that the skin bowl cannot rotate axially and move circumferentially, and it is also convenient to fit the variable diameter auxiliary device 23. In the scheme, the variable diameter auxiliary device 23 is provided with eight, which are circumferentially arranged around the discharge shell 1. The variable diameter auxiliary device 23 connects the skin bowl. When the power section encounters a curved pipe or a variable diameter pipe, the skin bowl is quickly adapted to the curvature change of the pipe, so that it always fits the pipe wall.

[0080] In order to illustrate the specific structure of the skin bowl, the utility model adopts the arc surface of the top of the skin bowl which fits the inner wall of the pipe;

[0081] The arc surface of the top of the skin bowl can better fit the arc surface of the inner wall of the pipe.

[0082] In order to illustrate the specific structure of the variable diameter auxiliary device 23, the utility model adopts the variable diameter auxiliary device 23 which comprises:

[0083] The linear rail bracket 231 is circumferentially arranged on the discharge shell body 11, and the front end is fitted to the front end skin bowl 21. There are eight circumferentially arranged, and each two is spaced by 45°. The elastic member 232 is arranged on the linear rail bracket 231. The telescopic mechanism 233 is connected with the front end of the linear rail bracket 231 and the elastic member 232.

[0084] The linear rail bracket 231 comprises: the first rail bracket 2311, the front end of which is fitted to the front end skin bowl 21, the bottom of which is arc-shaped and fitted to the outer wall of the discharge shell 1, and the top of which is provided with a connecting rod 2311 hinge connection device; the second rail bracket 2312, the bottom of which is arc-shaped and fitted to the outer wall of the discharge shell 1; the linear rail 2313 is arranged between the first rail bracket 2311 and the second rail bracket 2312.

[0085] The elastic member 232 comprises: the sliding block 2323 arranged on the linear rail 2313, the upper part of which is provided with a first pressure rod 2332 hinge connection device; the first elastic member 2321, the left end of which is fixed to the first rail bracket 2311, and the right end of which is fixed to the sliding block 2323. The second elastic member 2322, the left end of which is fixed to the sliding block 2323, and the right end of which is fixed to the second rail bracket 2312.

[0086] The telescopic mechanism 233 comprises a skin bowl patch 2333 attached to the inner wall of the front end skin bowl 21, a first pressure rod 2332 and a connecting rod 2311 hinge connection device arranged in the middle part; the connecting rod 2311 is hingedly connected to the hinge on the first track support 2311 at the lower end and hingedly connected to the hinge on the skin bowl patch 2333 at the upper end; the first pressure rod 2332 is hingedly connected to the hinge on the sliding block 2323 at the lower end and hingedly connected to the hinge on the skin bowl patch 2333 at the upper end.

[0087] In the present scheme, the sliding block 2323 is arranged in axial sliding, the first pressure rod 2332, the connecting rod 2331 and the skin bowl patch 2333, the first track support 2311 and the sliding block 2323 are hingedly connected, when the pipeline diameter changes or when the pipeline diameter decreases, the first pressure rod 2332 is retracted and pushes the sliding block 2323 to move backward, drives the first elastic member 2321 to stretch and the second elastic member 2322 to contract, so that the overall height of the skin bowl is reduced, so that the skin bowl is connected to move closer to the leakage shell 1, and the change of the pipeline diameter can be adapted.

[0088] When the pipeline diameter increases, the first elastic member 2321 is contracted, the second elastic member 2322 is released and stretched, drives the first pressure rod 2332 and the connecting rod 2311 to move forward, the overall height of the skin bowl is increased, so that the skin bowl is quickly rebounded and the change of the pipeline diameter is adapted.

[0089] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements of the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. A variable-diameter power joint capable of adjusting the motion speed of an in-pipe detector, characterized in that: a leakage housing (1) is in a cylindrical structure, and a guide passage (16) for medium flow is arranged inside the leakage housing (1), an inflow hole (12) is arranged at the axial rear end of the leakage housing (1), an outflow hole (13) is arranged at the axial front end of the leakage housing (1), and the inflow hole (12) and the outflow hole (13) are communicated through the guide passage (16); a leather cup assembly (2) is in a circular table structure, and includes a front-end leather cup (21) and a rear-end leather cup (22) distributed at the front end and the rear end of the leakage housing (1) in the axial direction, and the front-end leather cup (21) is provided with a variable-diameter auxiliary device (23); and a leakage valve (3) is in a square cone structure, and the top of the square cone structure is coaxially arranged with the central axis of the leakage housing (1), the leakage valve (3) is mainly composed of four conical flow limiting valves (32), and the leakage valve (3) is fixed in the leakage housing (1) by a valve hinge support (33). When the curvature radius of the pipeline changes, the variable-diameter power joint timely adapts to the change of the pipeline curvature under the action of the variable-diameter auxiliary device (23), so that the front-end leather cup (21) is always attached to the inner wall of the pipeline. The leakage housing (1) includes: a leakage housing body (11); a collision prevention device (15) arranged at the front end of the leakage housing body (11); 2. The variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 1, characterized in that, four inflow holes (12) arranged at the rear side of the rear-end leather cup (22) in the circumferential direction, and two inflow holes (12) are spaced apart by 90°; four outflow holes (13) arranged at the front side of the front-end leather cup (21) in the circumferential direction, and two outflow holes (13) are spaced apart by 90°; a universal joint connecting device (14) arranged at the rear end of the leakage housing body (11) and closely matched with the guide passage (16); a guide passage (16) located between the collision prevention device (15) and the universal joint connecting device (14). The collision prevention device (15) includes: a collision prevention head (151) arranged at the front end of the collision prevention device (15); a guide plate (152) fixedly arranged at the rear end of the collision prevention head (151) and located in the guide passage (16) and closely matched with the guide passage (16), and the guide plate (152) is in a 45° square cone structure.

3. The variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 2, characterized in that, The universal joint connecting device (14) includes: four circumferential limiting holes (141) arranged on the universal joint connecting device (14) in the circumferential direction, and two circumferential limiting holes are spaced apart by 90°; a connecting hole (142) arranged in the middle of the circumferential limiting hole (141).

4. The variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 2, characterized in that, The leather cup assembly (2) includes: a front-end leather cup (21) arranged behind the outflow hole (13); a rear-end leather cup (22) arranged in front of the inflow hole (12); 5. A variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 1, characterized in that, a variable-diameter auxiliary device (23) arranged on the rear end surface of the front-end leather cup (21). The variable-diameter auxiliary device (23) includes: ​ ​ 6. A variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 5, characterized in that, ​ Linear rail support (231), axially arranged on the flow discharge shell body (11), the front end is attached to the front end leather cup (21), and eight are circumferentially arranged, two by two are spaced 45°; Elastic member (232), arranged on the linear rail support (231); Telescopic mechanism (233), connected with the front end of the linear rail support (231) and the elastic member (232).

7. A variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 6, characterized in that, The linear rail support (231) comprises: The first rail support (2311) is attached to the front end leather cup (21) at the front end, and the bottom is arc-shaped and attached to the outer wall of the flow discharge shell body (11), and the top is provided with a hinge connection device of connecting rod (2331); The second rail support (2312) is arc-shaped and attached to the outer wall of the flow discharge shell body (11) at the bottom; Linear rail (2313), arranged between the first rail support (2311) and the second rail support (2312).

8. A variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 7, characterized in that, The elastic member (232) comprises: The sliding block (2323) is sleeved on the linear rail (2313) and can move axially along the linear rail (2313), and the upper part of the sliding block (2323) is provided with a hinge connection device of the first pressure rod (2332); The first elastic member (2321) is sleeved on the linear rail (2313), the left end is fixed on the first rail support (2311), and the right end is fixed on the right end of the sliding block (2323); The second elastic member (2322) is sleeved on the linear rail (2313), the left end is fixed on the left end of the sliding block (2323), and the right end is fixed on the second rail support (2312).

9. A variable-diameter power joint for adjusting the movement speed of an in-pipe detector according to claim 8, characterized in that, The telescopic mechanism (233) comprises: The leather cup patch (2333) is attached to the inner wall of the front end leather cup (21), and the middle part is provided with a hinge connection device of the first pressure rod (2332) and the connecting rod (2331); The connecting rod (2331) is connected with the hinge connection device on the first rail support (2311) at the lower end and with the hinge connection device on the leather cup patch (2333) at the upper end; The first pressure rod (2332) is connected with the hinge connection device on the sliding block (2323) at the lower end and with the hinge connection device on the leather cup patch (2333) at the upper end.

10. A variable-diameter dynamic joint for adjusting the movement speed of an in-pipe detector according to claim 2, characterized in that, The flow discharge valve (3) comprises: Valve hinge support (33), circumferentially arranged on the inner wall of the flow discharge shell body (11), one each on the upper part, lower part, left part and right part, and the upper end of the valve hinge support (33) is provided with a hinge sleeve; Frame type hinge connection member (34), the frame type hinge connection member (34) passes through the hinge sleeve on the valve hinge support (33) and the conical flow limiting valve (32), realizing the rotary connection of the valve hinge support (33) and the conical flow limiting valve (32); Conical flow limiting valve (32), the lower end is provided with a hinge sleeve, and the outer surface of the conical flow limiting valve (32) is provided with a hinge connection device of the second pressure rod (31); Second pressure rod (31), the lower end is connected with the hinge connection device on the conical flow limiting valve (32), and the upper end is connected with the hinge connection device on the inner wall of the flow discharge shell body (11).

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