CN220371828U

CN220371828U - Dredging device

Info

Publication number: CN220371828U
Application number: CN202321725532.2U
Authority: CN
Inventors: 马风福; 李志兰; 李天波; 姚强; 赵元琪; 何鹏; 董先营; 方军
Original assignee: National Energy Group Ningxia Coal Industry Co Ltd
Current assignee: National Energy Group Ningxia Coal Industry Co Ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2024-01-23
Anticipated expiration: 2033-07-03

Abstract

The utility model provides a dredging device, which comprises a first connecting pipe and a dredging part, wherein the first end of the first connecting pipe is closed, the second end of the first connecting pipe is used for being connected and communicated with the first end of an external connecting pipe of equipment to be detected, and the second end of the external connecting pipe is used for being communicated with a preset accommodating cavity in the equipment to be detected; the first connecting pipe is provided with a preset opening, and the preset opening is used for installing an instrument so that the instrument detects a fluid medium in a preset accommodating cavity; the dredging part is arranged in the first connecting pipe and is movably arranged along the axial direction of the first connecting pipe, so that the dredging part stretches into the outer connecting pipe to dredge the outer connecting pipe. The dredging device can solve the problem that an external pipe used for being connected with an instrument on equipment to be detected in the prior art is blocked frequently, and then measurement data of the instrument is inaccurate.

Description

Dredging device

Technical Field

The utility model relates to the technical field of chemical instruments, in particular to a dredging device.

Background

In the fields of traditional chemical industry, modern petrochemical industry and coal chemical industry, a liquid level meter, a differential pressure flowmeter and a pressure meter are indispensable detection meters, and the detection meters are not only reference bases required for maintaining stable operation of equipment and process optimization to adjust parameters, but also indispensable safety accessories of a pressure container, and the accuracy of display data of each detection meter is particularly important in chemical production.

However, due to different chemical process media, the media can be condensed, so that an external connection pipe used for being connected with a liquid level meter, a flowmeter and a pressure meter on equipment to be tested is often blocked, and further, the measurement data of the instrument is inaccurate.

Disclosure of Invention

The utility model mainly aims to provide a dredging device to solve the problem that an external pipe used for being connected with a meter on equipment to be tested in the prior art is often blocked, so that measurement data of the meter is inaccurate.

In order to achieve the above object, the present utility model provides a dredging apparatus, comprising: the first end of the first connecting pipe is closed, the second end of the first connecting pipe is used for being connected and communicated with the first end of an external connecting pipe of the equipment to be tested, and the second end of the external connecting pipe is used for being communicated with a preset accommodating cavity in the equipment to be tested; the first connecting pipe is provided with a preset opening, and the preset opening is used for installing an instrument so that the instrument detects a fluid medium in a preset accommodating cavity; the dredging part is arranged in the first connecting pipe and is movably arranged along the axial direction of the first connecting pipe, so that the dredging part stretches into the outer connecting pipe to dredge the outer connecting pipe.

Further, the dredging part is a helical blade, and the extending direction of the central axis of the helical blade is the same as or parallel to the axial direction of the first connecting pipe.

Further, the pull throughs further comprise: the cover plate is arranged at the first end of the first connecting pipe so that the first end of the first connecting pipe is closed; the cover plate is provided with a first penetrating hole; the driving assembly is positioned at the outer side of the first connecting pipe; the transmission rod is arranged in the first penetrating hole in a penetrating way, the axial direction of the transmission rod is parallel to the axial direction of the first connecting pipe, and the second end of the transmission rod is positioned in the first connecting pipe; the first end of the transmission rod penetrates out of the first penetrating hole and is in transmission connection with the driving assembly, so that the driving assembly drives the transmission rod to axially move along the transmission rod; the dredging part is fixedly arranged at the second end of the transmission rod.

Further, the dredging device further comprises a first sealing ring, and the first sealing ring is fixedly arranged on the wall of the first penetrating hole; the transmission rod is arranged in the first sealing ring in a penetrating way.

Further, the drive assembly includes: the axial direction of the connecting rod is parallel to or the same as that of the transmission rod, and the second end of the connecting rod is fixedly connected with the first end of the transmission rod; the first end of the connecting rod is provided with external threads; the transmission piece is provided with an internal threaded hole, and is sleeved at the first end of the connecting rod through the internal threaded hole; the transmission piece is rotatably arranged around the central axis of the connecting rod so as to drive the connecting rod to move along the axial direction of the connecting rod.

Further, the pull throughs further comprise: a support member having a mounting channel; the support part is provided with a first end and a second end which are oppositely arranged along the axial direction of the first connecting pipe, and the mounting channel is provided with the first end and the second end which are oppositely arranged; the second end of the supporting component is fixedly connected with the cover plate, and the second end of the mounting channel is communicated with the first penetrating hole; the second end of the connecting rod is positioned in the mounting channel; at least part of the transmission member is rotatably arranged at the first end of the mounting channel.

Further, along the axial direction of the connecting rod, the transmission piece comprises a first transmission part and a second transmission part which are fixedly connected with each other, and the second transmission part is rotatably arranged at the first end of the mounting channel; the first transmission part is positioned at the outer side of the installation channel; the driving assembly further comprises a driving wheel, and the driving wheel is fixedly sleeved on the first transmission part so as to drive the transmission part to rotate by rotating the driving wheel.

Further, the transmission member is positioned outside the mounting channel, and a first rotary bearing is arranged between the transmission member and the first end channel wall of the mounting channel; the driving assembly further comprises a driving wheel, and the driving wheel is fixedly sleeved on the transmission member so as to drive the transmission member to rotate by rotating the driving wheel.

Further, the dredging device further comprises a second connecting pipe, a first pipe orifice of the second connecting pipe is in butt joint communication with the preset opening, and a second pipe orifice of the second connecting pipe is used for installing an instrument.

Further, the instrument is a pressure gauge, or a differential pressure type flowmeter, or a differential pressure type liquid level gauge.

By applying the technical scheme of the utility model, the dredging device comprises a first connecting pipe, a second connecting pipe and a dredging part, wherein the first end of the first connecting pipe is closed, the second end of the first connecting pipe is used for being connected and communicated with the first end of an external connecting pipe of equipment to be detected, and the second end of the external connecting pipe is used for being communicated with a preset accommodating cavity in the equipment to be detected; the first connecting pipe is provided with a preset opening, and the preset opening is used for installing an instrument so that the instrument detects a fluid medium in a preset accommodating cavity; the dredging part is arranged in the first connecting pipe and is movably arranged along the axial direction of the first connecting pipe, so that the dredging part stretches into the outer connecting pipe to dredge the outer connecting pipe.

By using the dredging device, the dredging part can move along the axial direction of the first connecting pipe so that the dredging part stretches into the outer connecting pipe, and the dredging part stretching into the outer connecting pipe moves back and forth along the axial direction of the first connecting pipe so as to dredge the outer connecting pipe. The dredging device can solve the problem that the external connection tube used for being connected with the instrument on the equipment to be measured in the prior art is blocked frequently, and then the measurement data of the instrument is inaccurate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic view of the external structure of a pull through according to the present utility model;

FIG. 2 shows a schematic view of the internal structure of a pull through according to the present utility model;

FIG. 3 shows a schematic view of the dredging apparatus according to the utility model mounted on a device under test;

fig. 4 shows a schematic diagram of the connection structure of the pull through of fig. 3 and the extension tube of the device under test.

Wherein the above figures include the following reference numerals:

100. a dredging device;

10. a first connection pipe; 11. presetting an opening; 12. a cover plate; 121. a first through hole; 122. a first seal ring; 13. a first flange;

20. a second connection pipe; 21. a third flange;

30. a helical blade; 31. a transmission rod; 32. a transmission member; 321. a first transmission part; 33. a driving wheel; 34. a connecting rod; 341. a second locking member; 342. a plug-in groove;

60. a support member; 61. a mounting channel; 611. a main channel section; 612. a third seal ring; 62. a third locking member; 63. a support block; 64. a support case; 65. a first fixing plate; 66. a second fixing plate; 661. a third through hole; 662. a second seal ring;

200. a device under test; 210. an outer connecting pipe; 220. a second flange; 230. a first locking member.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The device under test 200 includes an extension tube 210, and the interior of the device under test 200 has a predetermined receiving chamber through which a fluid medium flows.

The utility model provides a dredging device 100, please refer to fig. 1 to 4, wherein the dredging device 100 comprises a first connecting pipe 10, a second connecting pipe 20 and a dredging part, wherein a first end of the first connecting pipe 10 is closed, a second end of the first connecting pipe 10 is used for being connected and communicated with a first end of an external connecting pipe 210 of a device 200 to be tested, and a second end of the external connecting pipe 210 is used for being communicated with a preset accommodating cavity in the device 200 to be tested; the first connecting pipe 10 is provided with a preset opening 11, and the preset opening 11 is used for installing an instrument so that the instrument detects a fluid medium in a preset accommodating cavity; the dredging portion is provided in the first connection pipe 10 and is movably provided in the axial direction of the first connection pipe 10 so that the dredging portion extends into the extension pipe 210 to dredge the extension pipe 210.

Specifically, the first connecting tube 10 and the outer connecting tube 210 are straight tubes, and the axial direction of the first connecting tube 10 and the axial direction of the outer connecting tube 210 are the same or parallel.

In the prior art, a first end of an external connection tube 210 of the device under test 200 is directly connected with an instrument, so that the instrument detects a fluid medium in a preset accommodating cavity; because the fluid medium is typically oil, the oil is condensed in the outer tube 210 and/or impurities in the fluid medium are deposited in the outer tube 210; if the extension tube 210 is not cleaned for a long time, the extension tube 210 is blocked, thereby affecting the test result of the meter on the fluid medium in the preset accommodating cavity. With the dredging device 100 of the present application, the dredging portion can move along the axial direction of the first connecting pipe 10 so that the dredging portion extends into the outer connecting pipe 210, and the dredging portion extending into the outer connecting pipe 210 moves reciprocally along the axial direction of the first connecting pipe 10, so as to dredge the outer connecting pipe 210. Therefore, the dredging device 100 of the present application can solve the problem that the external connection tube used for being connected with the instrument on the device to be tested in the prior art is often blocked, and thus the measurement data of the instrument is inaccurate.

In a specific implementation process, after the dredging portion dredges the outer connection pipe 210, the plug falling off from the pipe wall of the outer connection pipe 210 can flow into the preset accommodating cavity along with the fluid medium.

In this embodiment, the first end of the extension tube 210 is in abutting communication with the second end of the first connection tube 10.

Specifically, the second end of the first connection pipe 10 is provided with a first flange 13, the first end of the outer connection pipe 210 is provided with a second flange 220, and the first end of the outer connection pipe 210 is abutted and locked with the second end of the first connection pipe 10 by passing the first locking member 230 over the first flange 13 and the second flange 220.

Optionally, the axial direction of the extension tube 210 is parallel to the horizontal direction.

In the present embodiment, the dredging portion is a helical blade 30, and the extending direction of the central axis of the helical blade 30 is the same as or parallel to the axial direction of the first connecting pipe 10.

In this embodiment, the pull through 100 further includes a cover plate 12, a drive assembly, and a drive rod 31; the cover plate 12 is disposed at a first end of the first connection pipe 10 such that the first end of the first connection pipe 10 is closed; the cover plate 12 is provided with a first penetrating hole 121; the drive assembly is located outside the first connecting tube 10; the transmission rod 31 is arranged in the first penetrating hole 121 in a penetrating way, the axial direction of the transmission rod 31 is parallel to the axial direction of the first connecting pipe 10, and the second end of the transmission rod 31 is positioned in the first connecting pipe 10; the first end of the transmission rod 31 penetrates out of the first penetrating hole 121 and is in transmission connection with the driving assembly, so that the driving assembly drives the transmission rod 31 to axially move along the driving assembly; the dredging part is fixedly arranged at the second end of the transmission rod 31, so that the transmission rod 31 drives the dredging part to synchronously move.

Specifically, the spiral blade 30 is fixedly sleeved on the transmission rod 31, and the central axis of the transmission rod 31 coincides with the central axis of the spiral blade 30.

In this embodiment, the dredging device 100 further includes a first sealing ring 122, where the first sealing ring 122 is fixedly disposed on the wall of the first through hole 121, and a central axis surrounded by the first sealing ring 122 is coincident with or parallel to a hole axis of the first through hole 121; the transmission rod 31 is inserted into the first seal ring 122, the outer peripheral wall of the transmission rod 31 is in contact with the inner wall of the first seal ring 122, and the transmission rod 31 is movably arranged along the axial direction of the transmission rod 31 relative to the first seal ring 122.

In this embodiment, the driving assembly includes a connecting rod 34 and a transmission member 32, the axial direction of the connecting rod 34 is parallel to or the same as the axial direction of the transmission rod 31, and the second end of the connecting rod 34 is fixedly connected with the first end of the transmission rod 31; the first end of the connecting rod 34 is provided with an external thread; the transmission member 32 is provided with an internal threaded hole, and the transmission member 32 is sleeved at the first end of the connecting rod 34 through the internal threaded hole so as to realize threaded connection between the transmission member 32 and the connecting rod 34; the transmission member 32 is rotatably disposed around the central axis of the connecting rod 34, so that when the transmission member 32 rotates, the transmission member 32 drives the connecting rod 34 to move along the axial direction thereof, and further drives the transmission rod 31 and the dredging portion to move along the axial direction of the transmission rod 31 together.

Specifically, the second end of the connecting rod 34 is provided with an insertion groove 342, and the first end of the transmission rod 31 is inserted into the insertion groove 342; the second locking member 341 is inserted through the first end of the driving rod 31 and the second end of the connecting rod 34, so that the second end of the connecting rod 34 is locked and fixed with the first end of the driving rod 31.

In this embodiment, the pull through 100 further includes a support member 60, the support member 60 having a mounting channel 61; the support member 60 has opposite first and second ends along the axial direction of the first connection pipe 10, and the mounting channel 61 has opposite first and second ends; the first end to second end of the support member 60 is oriented the same as the first end to second end of the mounting channel 61; the second end of the supporting member 60 is fixedly connected with the cover plate 12; the second end of the mounting channel 61 communicates with the first through hole 121; the second end of the connecting rod 34 is located in the mounting channel 61; that is, the first end of the transmission rod 31 is penetrated out of the first penetration hole 121 and extended into the installation channel 61 to be connected with the second end of the connection rod 34; at least a portion of the transmission member 32 is rotatably disposed at a first end of the mounting channel 61 such that the support member 60 supports the transmission member 32 and such that the transmission member 32 can rotate relative to the support member 60 about the central axis of the connecting rod 34; that is, the transmission member 32 is rotatable only about the central axis of the connecting rod 34 and is not movable in the axial direction of the connecting rod 34 by the supporting member 60.

Specifically, the first mounting means of the transmission member 32 is: the transmission member 32 is located outside the mounting channel 61, and a first rotary bearing is provided between the transmission member 32 and the first end channel wall of the mounting channel 61, so that the transmission member 32 is connected with the first end channel wall of the mounting channel 61 through the first rotary bearing and the transmission member 32 can rotate relative to the supporting member 60; the driving assembly further comprises a driving wheel 33, wherein the driving wheel 33 is fixedly sleeved on the transmission member 32, so that the transmission member 32 is driven to rotate by rotating the driving wheel 33; the central axis of the driving wheel 33 coincides with the central axis of the connecting rod 34.

Specifically, the second mounting manner of the transmission member 32 is: the transmission member 32 includes a first transmission portion 321 and a second transmission portion fixedly connected to each other in the axial direction of the connecting rod 34, the second transmission portion being rotatably provided at a first end of the mounting passage 61; the first transmission portion 321 is located outside the mounting channel 61; the driving assembly further comprises a driving wheel 33, wherein the driving wheel 33 is fixedly sleeved on the first transmission part 321, so that the driving wheel 33 is rotated to drive the transmission piece 32 to rotate; the central axis of the driving wheel 33 coincides with the central axis of the connecting rod 34.

Specifically, a second rotary bearing is provided between the second transmission portion and the first end passage wall of the mounting passage 61 so that the transmission member 32 can rotate relative to the support member 60.

Alternatively, the drive wheel 33 is manually turned. In daily production, an operator only needs to rotate the driving wheel 33 regularly to realize regular dredging of the external connection pipe 210.

Specifically, the first end of the connecting rod 34 extends from the first end of the mounting channel 61 and the internally threaded bore of the driving member 32.

Specifically, a linear bearing is provided between the first end of the connecting rod 34 and the first end channel wall of the mounting channel 61; in the axial direction of the connecting rod 34, the first or second rotary bearing is located outside the linear bearing.

In the present embodiment, the mounting channel 61 includes a second penetration hole and a main channel segment 611 which are sequentially disposed and communicated in the axial direction of the connecting rod 34; the linear bearing is disposed between the first end of the connecting rod 34 and the wall of the second pierced hole. When the transmission member 32 is in the first mounting mode, a portion of the first rotary bearing is disposed in the second through hole. When the transmission member 32 is in the second mounting mode, the second transmission portion is rotatably disposed in the second through hole, that is, the second rotary bearing is disposed between the second transmission portion and the wall of the second through hole.

Specifically, the support member 60 includes a support block 63 and a support shell 64 fixedly connected, a second through hole is provided on the support block 63, and a main channel segment 611 is provided on the support shell 64.

Specifically, the support shell 64 is a bar-shaped structure.

Specifically, the supporting member 60 further includes a first fixing plate 65 and a second fixing plate 66 disposed opposite to each other, and the first fixing plate 65 is fixedly sleeved on the outer side of the supporting shell 64; the second fixing plate 66 has a third through hole 661; the second fixing plate 66 is fixedly connected with the cover plate 12; the third locking piece 62 is arranged on the first fixing plate 65 and the second fixing plate 66 in a penetrating way, so that the first fixing plate 65 and the second fixing plate 66 are locked and fixed; the third through hole 661 is in butt joint communication with the first through hole 121; the third through hole 661 communicates with the second end of the mounting channel 61. The first end of the transmission rod 31 is inserted into the first insertion hole 121 and the third insertion hole 661, and extends into the mounting channel 61 from the second end of the mounting channel 61.

Specifically, the dredging device 100 further includes a second sealing ring 662, the second sealing ring 662 is fixedly disposed on the hole wall of the third through hole 661, and a central axis surrounded by the second sealing ring 662 is coincident with or parallel to the hole axis of the third through hole 661; the transmission rod 31 is inserted into the second seal ring 662, the outer peripheral wall of the transmission rod 31 is in contact with the inner wall of the second seal ring 662, and the transmission rod 31 is movably disposed with respect to the second seal ring 662 in the axial direction of the transmission rod 31.

Optionally, the second seal 662 and the first seal 122 are of unitary construction.

Specifically, the pull through 100 further includes a third seal ring 612, where the third seal ring 612 is disposed at the second end of the mounting channel 61; the transmission rod 31 is arranged in the third sealing ring 612 in a penetrating way.

In particular, most of the segments of the transmission rod 31 are located in the first connecting tube 10 and most of the segments of the connecting rod 34 are located in the mounting channel 61.

In the specific implementation process, when the connecting rod 34 and the transmission rod 31 axially move together, the connecting rod 34 is always positioned in the mounting channel 61; the second end of the transmission rod 31 is to extend out of the first connecting tube 10 into the extension tube 210.

In the present embodiment, the central axis of the connecting rod 34 and the central axis of the transmission rod 31 coincide.

In this embodiment, the dredging apparatus 100 further includes a second connecting pipe 20, a first pipe orifice of the second connecting pipe 20 is in butt-joint communication with the preset opening 11, and a second pipe orifice of the second connecting pipe 20 is used for installing an instrument.

Specifically, the second connection pipe 20 is a straight pipe; alternatively, the axial direction of the second connection pipe 20 is perpendicular to the axial direction of the first connection pipe 10.

Specifically, the second end of the second connection tube 20 is provided with a third flange 21, the third flange 21 being for connection with a meter.

In this embodiment, the meter is a pressure gauge, or a differential pressure flow meter, or a differential pressure level gauge.

Specifically, when the meter is a pressure gauge or a differential pressure type flowmeter, the preset accommodating cavity may be a preset flow channel.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

in the dredging device 100 provided by the utility model, the dredging device 100 comprises a first connecting pipe 10, a second connecting pipe 20 and a dredging part, wherein the first end of the first connecting pipe 10 is closed, the second end of the first connecting pipe 10 is used for being connected and communicated with the first end of an external connecting pipe 210 of the equipment 200 to be detected, and the second end of the external connecting pipe 210 is used for being communicated with a preset accommodating cavity in the equipment 200 to be detected; the first connecting pipe 10 is provided with a preset opening 11, and the preset opening 11 is used for installing an instrument so that the instrument detects a fluid medium in a preset accommodating cavity; the dredging portion is provided in the first connection pipe 10 and is movably provided in the axial direction of the first connection pipe 10 so that the dredging portion extends into the extension pipe 210 to dredge the extension pipe 210.

With the dredging device 100, the dredging part can move along the axial direction of the first connecting pipe 10 so that the dredging part stretches into the outer connecting pipe 210, and the dredging part stretching into the outer connecting pipe 210 moves back and forth along the axial direction of the first connecting pipe 10, so that the outer connecting pipe 210 is dredged. The dredging device 100 can solve the problem that the external connection tube used for being connected with the instrument on the equipment to be detected in the prior art is blocked frequently, so that the measurement data of the instrument is inaccurate.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pull throughs, characterized in that it comprises:

the device comprises a first connecting pipe (10), wherein the first end of the first connecting pipe (10) is closed, the second end of the first connecting pipe (10) is used for being connected and communicated with the first end of an external connecting pipe (210) of the device to be tested (200), and the second end of the external connecting pipe (210) is used for being communicated with a preset accommodating cavity in the device to be tested (200); the first connecting pipe (10) is provided with a preset opening (11), and the preset opening (11) is used for installing an instrument so that the instrument detects a fluid medium in the preset accommodating cavity;

the dredging part is arranged in the first connecting pipe (10) and is movably arranged along the axial direction of the first connecting pipe (10), so that the dredging part stretches into the external connecting pipe (210) to dredge the external connecting pipe (210).

2. The dredging arrangement according to claim 1, characterized in that the dredging arrangement is a helical blade (30), the central axis of the helical blade (30) extending in the same direction or in parallel with the axial direction of the first connecting tube (10).

3. The pull through of claim 1 or 2, further comprising:

a cover plate (12), wherein the cover plate (12) is arranged at the first end of the first connecting pipe (10) so as to enable the first end of the first connecting pipe (10) to be arranged in a closed manner; a first penetrating hole (121) is formed in the cover plate (12);

a drive assembly located outside the first connection tube (10);

the transmission rod (31) is arranged in the first penetrating hole (121) in a penetrating mode, the axial direction of the transmission rod (31) is parallel to the axial direction of the first connecting pipe (10), and the second end of the transmission rod (31) is positioned in the first connecting pipe (10); the first end of the transmission rod (31) penetrates out of the first penetrating hole (121) and is in transmission connection with the driving assembly, so that the driving assembly drives the transmission rod (31) to move along the axial direction of the transmission rod; the dredging part is fixedly arranged at the second end of the transmission rod (31).

4. A pull through according to claim 3, further comprising a first sealing ring (122), the first sealing ring (122) being fixedly arranged on the wall of the first through hole (121); the transmission rod (31) is arranged in the first sealing ring (122) in a penetrating mode.

5. A pull through of claim 3, wherein the drive assembly comprises:

the axial direction of the connecting rod (34) is parallel to or the same as the axial direction of the transmission rod (31), and the second end of the connecting rod (34) is fixedly connected with the first end of the transmission rod (31); the first end of the connecting rod (34) is provided with external threads;

the transmission piece (32) is provided with an internal threaded hole, and the transmission piece (32) is sleeved at the first end of the connecting rod (34) through the internal threaded hole; the transmission member (32) is rotatably disposed about a central axis of the connecting rod (34) to drive the connecting rod (34) to move in an axial direction thereof.

6. The pull through of claim 5, further comprising:

a support member (60), the support member (60) having a mounting channel (61); the support member (60) has a first end and a second end disposed opposite to each other in an axial direction of the first connecting pipe (10), and the mounting passage (61) has a first end and a second end disposed opposite to each other; the second end of the supporting component (60) is fixedly connected with the cover plate (12), and the second end of the mounting channel (61) is communicated with the first penetrating hole (121); a second end of the connecting rod (34) is positioned in the mounting channel (61); at least part of the transmission member (32) is rotatably arranged at a first end of the mounting channel (61).

7. The dredging device according to claim 6, wherein the transmission member (32) comprises a first transmission portion (321) and a second transmission portion fixedly connected to each other in the axial direction of the connecting rod (34), the second transmission portion being rotatably arranged at a first end of the mounting channel (61); the first transmission part (321) is positioned outside the mounting channel (61);

the driving assembly further comprises a driving wheel (33), and the driving wheel (33) is fixedly sleeved on the first transmission part (321) so as to drive the transmission piece (32) to rotate by rotating the driving wheel (33).

8. The pull through of claim 6 wherein the drive member (32) is located outside of the mounting channel (61), a first swivel bearing being provided between the drive member (32) and a first end channel wall of the mounting channel (61);

the driving assembly further comprises a driving wheel (33), and the driving wheel (33) is fixedly sleeved on the transmission piece (32) so as to drive the transmission piece (32) to rotate by rotating the driving wheel (33).

9. The dredging device according to claim 1, further comprising a second connection tube (20), a first orifice of the second connection tube (20) being in abutting communication with the preset opening (11), a second orifice of the second connection tube (20) being for mounting a meter.

10. The pull through of claim 1, wherein the meter is a pressure gauge, or a differential pressure flow meter, or a differential pressure level gauge.