Gas tightness testing device for gas pipeline

Abstract

The utility model relates to the technical field of pipeline detection, and discloses a gas pipeline airtightness testing device which comprises a water tank, a hollow shaft, an electric telescopic rod, a moving plate, a rotating shaft, a circular plate, a spline sleeve, a spline shaft, a transmission part and an annular plate. During use, after a to-be-detected pipeline is placed in the water tank, the electric push rod is controlled to work, the movable plate can be driven to move, and finally the pipeline can be clamped between the circular plate and the annular plate. And then the gas supply equipment is controlled to work, and gas can enter the pipeline through the hollow shaft and the annular plate. After the spline shaft is controlled to rotate, the spline sleeve on the spline shaft can be driven to rotate synchronously. And then under the transmission of the transmission piece, the rotating shaft and the hollow shaft can rotate synchronously, and then the clamped pipeline is driven to rotate. And then whether air leakage occurs can be judged by observing whether bubbles leak from the surface of the pipeline. Moreover, the position of the spline shaft is fixed, so that the position of a power source for driving the spline shaft to rotate is fixed, and the problem of winding of an external cable is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline detection, for example to a gas pipeline air tightness testing device. BACKGROUND

[0002] A gas pipeline air tightness detection device is disclosed in the related technology (publication number: CN221527905U), which comprises a water tank, a top plate, a moving seat, a support ring, a rotating disc, a rotating ring, a plugging cover, a guide rod, a stud, an ear plate, an air inlet pipe, a connecting elbow, a gear ring, a driving motor, a gear, a ventilation hole, a first motor, a screw rod, a driving seat, a rectangular sleeve, a sliding plate, a rubber disc, a gas pipeline, a lead screw, a third motor, a side frame and a telescopic cylinder.

[0003] In the process of implementing the above-mentioned embodiments, it is found that at least the following problems exist in the related technology:

[0004] The gas pipeline air tightness detection device controls the first motor to work, and the rubber disc can abut against the outer wall of the gas pipeline to fix the gas pipeline. After the pipeline is immersed in water, the driving motor is controlled to work, and the rotating disc can drive the gas pipeline to rotate. Thus, whether there is air bubble leakage on the surface of the gas pipeline is observed to determine whether leakage occurs. However, the first motor will also rotate under the driving of the rotating disc, so that the external cable of the first motor is easily entangled.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information which does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor does it determine the key / important constituent elements or delineate the protection scope of these embodiments, but serves as a prelude to the detailed description below.

[0007] The gas pipeline air tightness testing device provided by the embodiments of the present application can avoid the entanglement of the external cable.

[0008] In some embodiments, the gas pipeline gas tightness testing device comprises: a water tank placed on the ground; a hollow shaft rotatably installed inside the water tank along the length direction of the water tank; an electric telescopic rod installed on the outer wall of the water tank along the length direction of the water tank, the moving end of the electric telescopic rod penetrating through the side wall of the water tank; a moving plate installed on the moving end of the electric telescopic rod; a rotating shaft rotatably installed on the moving plate and coaxially distributed with the hollow shaft; a circular plate connected to one end of the rotating shaft facing the hollow shaft; a spline sleeve rotatably installed on the moving plate along the length direction of the water tank and located outside the water tank; a spline shaft slidably penetrating through the spline sleeve and rotatably installed on the side wall of the water tank; a transmission member installed between the spline sleeve and the rotating shaft and between the spline shaft and the hollow shaft, respectively; and an annular plate connected to one end of the hollow shaft facing the rotating shaft, the other end of the hollow shaft being used for connecting with a gas supply device; wherein the spline shaft is controlled to rotate, and the hollow shaft and the rotating shaft are synchronously rotated through the transmission member.

[0009] Optionally, the transmission member comprises: a driving gear installed on the spline sleeve and the spline shaft, respectively; a driven gear installed on the rotating shaft and the hollow shaft, respectively; and a synchronous toothed belt sleeved between the two driving gears and the two driven gears, respectively.

[0010] Optionally, the device further comprises: a motor installed on the outer wall of the water tank; a driving bevel gear installed on the rotating end of the motor; and a driven bevel gear installed on the spline shaft and engaged with the driving bevel gear.

[0011] Optionally, the device further comprises: a rotary joint installed on the other end of the hollow shaft; a hard pipe penetrating through the side wall of the water tank, one end of the hard pipe being connected with the rotary joint, and the other end of the hard pipe being connected with the gas supply device; and a pressure gauge installed on the hard pipe and located outside the water tank.

[0012] Optionally, the device further comprises: a support rod installed on the inner wall of the water tank; and a mounting plate installed on the end of the support rod; wherein the hollow shaft is rotatably installed on the mounting plate.

[0013] Optionally, the device further comprises: a first bearing seat installed on the mounting plate and sleeved on the hollow shaft; and a first bearing installed between the first bearing seat and the hollow shaft.

[0014] Optionally, the device further comprises: a second bearing seat installed on the moving plate and sleeved on the rotating shaft and the spline sleeve, respectively; and a second bearing installed between the rotating shaft and the spline sleeve and the two second bearing seats, respectively.

[0015] Optionally, further comprising: a third bearing seat installed on the side wall of the water tank and sleeved on the spline shaft; and a third bearing installed between the spline shaft and the third bearing seat.

[0016] Optionally, further comprising: a support installed on the bottom wall of the water tank and located inside the water tank; and a roller installed on the support and located on both sides of the water tank.

[0017] The gas pipeline air tightness testing device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] The gas pipeline air tightness testing device provided by the embodiments of the present disclosure comprises a water tank, a hollow shaft, an electric telescopic rod, a moving plate, a rotating shaft, a circular plate, a spline sleeve, a spline shaft, a transmission member and an annular plate. The water tank is placed on the ground and used for containing water. The hollow shaft is rotatably installed inside the water tank along the length direction of the water tank, and the hollow shaft can rotate around its axis. The electric telescopic rod is installed on the outer wall of the water tank along the length direction of the water tank, and the moving end of the electric telescopic rod penetrates through the side wall of the water tank and is used for providing driving force to realize linear movement. The moving plate is installed on the moving end of the electric telescopic rod and moves along the length direction of the water tank under the driving of the electric telescopic rod. The rotating shaft is rotatably installed on the moving plate and coaxially distributed with the hollow shaft, and the rotating shaft can rotate around its axis. The circular plate is connected to one end of the rotating shaft facing the hollow shaft and used for plugging one end of the pipeline to be detected. The spline sleeve is rotatably installed on the moving plate along the length direction of the water tank and located outside the water tank, and the spline sleeve can rotate around its axis. The spline shaft is slidably arranged in the spline sleeve and rotatably installed on the side wall of the water tank. The spline shaft can drive the spline sleeve to rotate, and the spline sleeve can slide relative to the spline shaft. The transmission member is installed between the spline sleeve and the rotating shaft and between the spline shaft and the hollow shaft, respectively, and used for transmitting driving force. The annular plate is connected to the other end of the hollow shaft facing the rotating shaft and used for plugging the other end of the pipeline to be detected. The other end of the hollow shaft is used for being connected with a gas supply device. After the spline shaft is controlled to rotate, the hollow shaft and the rotating shaft are synchronously rotated through the transmission member.

[0019] When in use, after the pipeline to be detected is placed in the interior of the sink, the electric push rod is controlled to work, the moving plate is driven to move, and finally the pipeline is clamped between the circular plate and the annular plate. Then the gas supply device is controlled to work, the gas enters into the interior of the pipeline through the hollow shaft and the annular plate. After the spline shaft is controlled to rotate, the spline sleeve on the spline shaft is synchronously rotated. Then under the transmission of the transmission member, the rotating shaft and the hollow shaft are synchronously rotated, and further drive the clamped pipeline to rotate. Then after clean water is added in the interior of the sink, whether the pipeline surface has bubble leakage can be observed, so as to determine whether the gas leakage occurs. Moreover, since the position of the spline shaft is fixed, the position of the power source driving the spline shaft to rotate is fixed, so that the problem of external cable winding is solved.

[0020] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0021] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the application as defined by the claims. Like numbers refer to like elements throughout the drawings, which are not necessarily to scale, with:

[0022] Figure 1 is a sectional view of a gas pipeline air tightness testing device provided by the embodiment of the present disclosure;

[0023] Figure 2 is Figure 1 is an enlarged structure schematic view of A in FIG. 1;

[0024] Figure 3 is Figure 1 is an enlarged structure schematic view of B in FIG. 1;

[0025] Figure 4 is a front view of a gas pipeline air tightness testing device provided by the embodiment of the present disclosure.

[0026] LIST OF REFERENCE NUMERALS:

[0027] 1: sink; 2: hollow shaft; 3: electric telescopic rod; 4: moving plate; 5: rotating shaft; 6: circular plate; 7: spline sleeve; 8: spline shaft; 9: transmission member; 10: annular plate; 11: motor; 12: rotary joint; 13: hard pipe; 14: pressure gauge; 15: support rod; 16: mounting plate; 17: first bearing seat; 18: second bearing seat; 19: third bearing seat; 20: support; 21: roller; 22: drain valve. DETAILED DESCRIPTION

[0028] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below, and the accompanying drawings are used for reference only and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0029] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0031] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0032] Unless otherwise specified, the term "a plurality of" means two or more.

[0033] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B represents: A or B.

[0034] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B, which means: A or B, or, A and B, the three relationships.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0036] Combination Figures 1 to 4 As shown, this embodiment of the present disclosure provides a gas pipeline airtightness testing device, including a water tank 1, a hollow shaft 2, an electric telescopic rod 3, a moving plate 4, a rotating shaft 5, a circular plate 6, a spline sleeve 7, a spline shaft 8, a transmission component 9, and an annular plate 10. The water tank 1 is placed on the ground to hold water. The hollow shaft 2 is rotatably installed inside the water tank 1 along its length, and can rotate around its axis. The electric telescopic rod 3 is installed on the outer wall of the water tank 1 along its length, and its moving end passes through the side wall of the water tank 1 to provide driving force for linear movement. The moving plate 4 is installed on the moving end of the electric telescopic rod 3 and moves along the length of the water tank 1 under the drive of the electric telescopic rod 3. The rotating shaft 5 is rotatably installed on the moving plate 4 and is coaxially distributed with the hollow shaft 2, and can rotate around its axis. The circular plate 6 is connected to the end of the rotating shaft 5 facing the hollow shaft 2 and is used to seal one end of the pipeline to be tested. The spline sleeve 7 is rotatably mounted on the movable plate 4 along the length of the water tank 1 and is located outside the water tank 1. The spline sleeve 7 can rotate around its axis. The spline shaft 8 is slidably inserted through the spline sleeve 7 and rotatably mounted on the side wall of the water tank 1. The spline shaft 8 can drive the spline sleeve 7 to rotate, and the spline sleeve 7 can slide relative to the spline shaft 8. Transmission components 9 are respectively installed between the spline sleeve 7 and the rotating shaft 5 and between the spline shaft 8 and the hollow shaft 2, for transmitting driving force. The annular plate 10 is connected to the end of the hollow shaft 2 facing the rotating shaft 5, for sealing the other end of the pipe to be tested. The other end of the hollow shaft 2 is used to connect to the air supply equipment. When the spline shaft 8 is rotated under control, the transmission components 9 cause the hollow shaft 2 and the rotating shaft 5 to rotate synchronously.

[0037] This embodiment of the invention provides a gas pipeline airtightness testing device. After placing the pipeline to be tested inside a water tank 1, controlling an electric push rod moves a movable plate 4, ultimately clamping the pipeline between a circular plate 6 and an annular plate 10. Then, controlling the gas supply equipment allows gas to enter the pipeline through the hollow shaft 2 and the annular plate 10. Controlled rotation of the splined shaft 8 causes the splined sleeve 7 on it to rotate synchronously. Then, under the transmission of the transmission component 9, the rotating shaft 5 and the hollow shaft 2 rotate synchronously, thereby rotating the clamped pipeline. After adding clean water to the water tank 1, it is possible to observe whether air bubbles leak from the pipeline surface, thus determining whether a leak has occurred. Furthermore, since the position of the splined shaft 8 is fixed, the power source driving its rotation is also fixed, thus solving the problem of external cable entanglement.

[0038] Optionally, combined Figure 1As shown, the transmission member 9 comprises a driving sprocket, a driven sprocket and a synchronous toothed belt. The driving sprocket is respectively installed on the spline sleeve 7 and the spline shaft 8, and rotates under the driving of the spline sleeve 7 and the spline shaft 8. The driven sprocket is respectively installed on the rotating shaft 5 and the hollow shaft 2, and is used to drive the rotating shaft 5 and the hollow shaft 2 to rotate. The synchronous toothed belt is sleeved between the two driving sprockets and the two driven sprockets, and is used to transmit driving force.

[0039] In the embodiment of the present disclosure, after the spline shaft 8 is controlled to rotate, the spline sleeve 7 on the spline shaft 8 is driven to rotate synchronously, so that the two driving sprockets rotate synchronously. Then, through the two synchronous toothed belts, the two driven sprockets are driven to rotate synchronously. In turn, the rotating shaft 5 and the hollow shaft 2 are driven to rotate synchronously, so that the circular plate 6 and the annular plate 10 rotate synchronously, and the clamped pipeline is turned over.

[0040] Optionally, as shown in Figure 1 and Figure 4 As shown, the device further comprises a motor 11, a driving bevel gear and a driven bevel gear. The motor 11 is installed on the outer wall of the sink 1, and is used to provide driving force to realize the rotating motion function. The driving bevel gear is installed on the rotating end of the motor 11, and rotates under the driving of the motor 11. The driven bevel gear is installed on the spline shaft 8, and is used to drive the spline shaft 8 to rotate. Thus, the bevel gears mesh with the driving bevel gear, jointly transmit driving force, and change the direction of force.

[0041] In the embodiment of the present disclosure, the motor 11 is controlled to work, so that the driving bevel gear rotates. Through the meshing action between the teeth, the driven bevel gear is driven to rotate. In turn, the spline shaft 8 is driven to rotate, and finally the automatic overturning function of the clamped pipeline is realized.

[0042] Optionally, as shown in Figure 1 The device further comprises a rotary joint 12, a hard pipe 13 and a pressure gauge 14. The rotary joint 12 is installed on the other end of the hollow shaft 2, so that the connected components can keep in communication while rotating. The hard pipe 13 penetrates through the side wall of the sink 1, one end of the hard pipe 13 is connected with the rotary joint 12, and the other end of the hard pipe 13 is connected with a gas supply device, which is used to transport gas. The pressure gauge 14 is installed on the hard pipe 13 and located outside the sink 1, which is used to detect the gas pressure.

[0043] In the embodiment of the present disclosure, the gas supply device is controlled to work, and the gas enters into the pipeline through the hard pipe 13, the rotary joint 12, the hollow shaft 2 and the annular plate 10. After being pressurized to a preset pressure value, the gas supply device stops working. Then, whether the pressure value of the pressure gauge 14 continues to decrease is observed, so as to judge whether the pipeline leaks.

[0044] Optionally, as shown in Figure 1As shown, the faucet further comprises a support rod 15 and a mounting plate 16. The support rod 15 is mounted on the inner wall of the sink 1. The mounting plate 16 is mounted on the end of the support rod 15. The hollow shaft 2 is rotatably mounted on the mounting plate 16.

[0045] In the embodiments of the present disclosure, the support rod 15 is used to determine the relative position of the mounting plate 16 and the sink 1. The hollow shaft 2 is rotatably mounted on the mounting plate 16.

[0046] Optionally, in combination with Figure 1 and Figure 2 As shown, the faucet further comprises a first bearing seat 17 and a first bearing. The first bearing seat 17 is mounted on the mounting plate 16 and sleeved on the hollow shaft 2. The first bearing is mounted between the first bearing seat 17 and the hollow shaft 2.

[0047] In the embodiments of the present disclosure, the first bearing seat 17 is used to support and limit the first bearing. The first bearing is used to support and rotatably mount the hollow shaft 2, reduce the friction of the hollow shaft 2, and improve the rotation accuracy of the hollow shaft 2.

[0048] Optionally, in combination with Figure 1 and Figure 3 As shown, the faucet further comprises a second bearing seat 18 and a second bearing. The second bearing seat 18 is mounted on the moving plate 4 and sleeved on the shaft 5 and the spline sleeve 7 respectively. The second bearing is mounted between the shaft 5 and the spline sleeve 7 and the two second bearing seats 18 respectively.

[0049] In the embodiments of the present disclosure, the second bearing seat 18 is used to support and limit the second bearing. The second bearing is used to support and rotatably mount the shaft 5 and the spline sleeve 7, reduce the friction of the shaft 5 and the spline sleeve 7, and improve the rotation accuracy of the shaft 5 and the spline sleeve 7.

[0050] Optionally, in combination with Figure 1 and Figure 4 As shown, the faucet further comprises a third bearing seat 19 and a third bearing. The third bearing seat 19 is mounted on the side wall of the sink 1 and sleeved on the spline shaft 8. The third bearing is mounted between the spline shaft 8 and the third bearing seat 19.

[0051] In the embodiments of the present disclosure, the third bearing seat 19 is used to support and limit the third bearing. The third bearing is used to support and rotatably mount the spline shaft 8, reduce the friction of the spline shaft 8, and improve the rotation accuracy of the spline shaft 8.

[0052] Optionally, in combination with Figure 1As shown, the water tank 1 further comprises a plurality of supports 20 and a plurality of rollers 21. The supports 20 are evenly arranged on the bottom wall of the water tank 1 along the length direction of the water tank 1 and are located inside the water tank 1. The rollers 21 are evenly arranged on the supports 20 along the length direction of the water tank 1 and are located on both sides of the water tank 1 along the width direction of the water tank 1.

[0053] In the embodiments of the present disclosure, each support 20 is used for supporting the rollers 21. The plurality of rollers 21 on both sides are used for supporting and limiting the pipes.

[0054] Optionally, in combination with Figure 1 and Figure 4 As shown, the water tank 1 further comprises a plurality of supports 20 and a plurality of rollers 21. The supports 20 are evenly arranged on the bottom wall of the water tank 1 along the length direction of the water tank 1 and are located inside the water tank 1. The rollers 21 are evenly arranged on the supports 20 along the length direction of the water tank 1 and are located on both sides of the water tank 1 along the width direction of the water tank 1.

[0055] In the embodiments of the present disclosure, the water tank 1 further comprises a plurality of supports 20 and a plurality of rollers 21. The supports 20 are evenly arranged on the bottom wall of the water tank 1 along the length direction of the water tank 1 and are located inside the water tank 1. The rollers 21 are evenly arranged on the supports 20 along the length direction of the water tank 1 and are located on both sides of the water tank 1 along the width direction of the water tank 1.

[0056] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments are merely representative of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A gas pipeline gas tightness testing device, characterized by, It comprises: a sink placed on the ground; a hollow shaft rotatably installed inside the sink along the length direction of the sink; an electric telescopic rod installed on the outer wall of the sink along the length direction of the sink, the moving end of the electric telescopic rod penetrating through the side wall of the sink; a moving plate installed on the moving end of the electric telescopic rod; a rotating shaft rotatably installed on the moving plate and coaxially distributed with the hollow shaft; a circular plate connected to one end of the rotating shaft facing the hollow shaft; a spline sleeve rotatably installed on the moving plate and located outside the sink along the length direction of the sink; a spline shaft slidably penetrating through the spline sleeve and rotatably installed on the side wall of the sink; a transmission member respectively installed between the spline sleeve and the rotating shaft and between the spline shaft and the hollow shaft; a ring-shaped plate connected to one end of the hollow shaft facing the rotating shaft, the other end of the hollow shaft being used for being connected with a gas supply device; wherein, after the spline shaft is controlled to rotate, the hollow shaft and the rotating shaft are synchronously rotated through the transmission member.

2. A gas tightness testing device for gas pipes according to claim 1, characterized in that The transmission member comprises: a driving belt gear respectively installed on the spline sleeve and the spline shaft; a driven belt gear respectively installed on the rotating shaft and the hollow shaft; a synchronous toothed belt respectively sleeved between the two driving belt gears and the two driven belt gears.

3. The gas tightness testing device for gas pipes according to claim 1, characterized in that, It further comprises: a motor installed on the outer wall of the sink; a driving bevel gear installed on the rotating end of the motor; a driven bevel gear installed on the spline shaft and engaged with the driving bevel gear.

4. The gas tightness testing device for gas pipes according to claim 1, characterized in that, It further comprises: a rotary joint installed on the other end of the hollow shaft; a hard pipe penetrating through the side wall of the sink, one end of the hard pipe being connected with the rotary joint, the other end of the hard pipe being connected with the gas supply device; a pressure gauge installed on the hard pipe and located outside the sink.

5. The gas tightness testing device for gas pipes according to claim 1, characterized in that, It further comprises: a support rod installed on the inner wall of the sink; an installation plate installed on the end of the support rod; wherein, the hollow shaft is rotatably installed on the installation plate.

6. A gas pipeline gas tightness testing apparatus according to claim 5, wherein, It further comprises: a first bearing seat installed on the installation plate and sleeved on the hollow shaft; a first bearing installed between the first bearing seat and the hollow shaft.

7. A gas pipeline gas tightness testing apparatus according to any one of claims 1 to 6, wherein, It further comprises: a second bearing seat installed on the moving plate and sleeved on the rotating shaft and the spline sleeve respectively; a second bearing respectively installed between the rotating shaft and the spline sleeve and the two second bearing seats.

8. A gas pipeline gas tightness testing apparatus according to any one of claims 1 to 6, wherein, It further comprises: a third bearing seat installed on the side wall of the sink and sleeved on the spline shaft; a third bearing installed between the spline shaft and the third bearing seat.

9. A gas pipeline gas tightness testing apparatus according to any one of claims 1 to 6, wherein, It further comprises: a support uniformly installed on the bottom wall of the sink along the length direction of the sink and located inside the sink; a roller uniformly installed on the support along the length direction of the sink and located on both sides of the sink along the width direction of the sink.

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