Ball collecting device and automatic ball collecting system suitable for natural gas gathering and transportation pipeline

Abstract

The utility model discloses a ball collecting device and an automatic ball collecting system suitable for a natural gas gathering and transportation pipeline. The ball collecting device comprises a ball collecting barrel, a ball collecting pushing piece, a ball collecting channel and a ball collecting auxiliary pushing piece. The ball receiving barrel is provided with two opening ends which are respectively communicated with the upstream pipeline and the downstream pipeline on two sides; one end of the ball receiving pushing piece penetrates through the ball receiving barrel and extends to the outside, the ball receiving channel is arranged on the ball receiving pushing piece in a penetrating mode, the ball receiving channel can contain the spherical pig, and the ball receiving channel is communicated with the ball receiving barrel in a reset state; the ball collecting auxiliary pushing piece is located on one side of the ball collecting barrel, and one end of the ball collecting auxiliary pushing piece can enter and exit from the ball collecting channel so that the spherical pig can be pushed out of the ball collecting channel in the state that the ball collecting channel is pushed out of the ball collecting barrel; and the ball receiving pushing piece and the ball receiving auxiliary pushing piece are respectively connected with a ball receiving reciprocating driving mechanism and a ball receiving auxiliary reciprocating driving mechanism. According to the utility model, the operation risk is reduced, and environmental pollution and resource waste are avoided. Time and labor are saved, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of pigging ball receiving for natural gas gathering and transportation pipelines, and specifically relates to a ball receiving device and an automatic ball receiving system applicable to natural gas gathering and transportation pipelines. Background Art

[0002] Single wells in gas production well stations and gathering and transportation pipelines of the stations are often affected by dirt and liquid accumulation, which affects the transportation efficiency, causes the transmission pressure to rise, and even leads to overpressure shutdown, affecting the normal production of gas wells. Especially in winter, as the temperature drops, the saturated water vapor in the raw gas is more likely to condense into water, reducing the pipeline transportation efficiency.

[0003] By regularly pigging the pipeline, the pressure loss of natural gas transportation can be reduced, ensuring the efficient operation of the pipeline, the full play of the gas well production capacity, and the safe operation of the entire pipe network.

[0004] The existing pigging operation mode requires operators to go to each single well station for ball receiving operations. The pigging device generally uses a pigging valve (see Figure 1 ). On-site employees listen for monitoring. After predicting that the ball is received, the inlet ball valve 1 and the outlet ball valve 3 are manually closed successively, and then the pipeline is vented. The employees open the pigging valve 2 to take out the ball. Then the pigging valve 2 and the venting are closed, and the outlet ball valve 3 and the inlet ball valve 1 are opened successively. During the above ball taking process, the pipeline needs to be vented before manually taking out the ball from the pipeline. This process is time-consuming and cumbersome, and is faced with great operation risks. Venting some natural gas will also cause environmental pollution and resource waste.

[0005] In view of this, this patent application is proposed. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a ball receiving device and an automatic ball receiving system applicable to natural gas gathering and transportation pipelines, so as to solve the various problems existing in the current ball receiving on natural gas gathering and transportation pipelines as described above.

[0007] The utility model is realized through the following technical solutions:

[0008] The first purpose of the utility model is to provide a ball receiving device applicable to natural gas gathering and transportation pipelines, including a ball receiving cylinder body, a ball receiving pushing member, a ball receiving channel, and a ball receiving auxiliary pushing member;

[0009] The ball receiving cylinder body has two open ends, which are respectively communicated with the upstream pipeline and the downstream pipeline located on both sides;

[0010] One end of the ball receiving pushing member penetrates through the ball receiving cylinder body and extends to the outside. The ball receiving channel is disposed through the ball receiving pushing member. The ball receiving channel can accommodate a pigging ball, and the ball receiving channel is communicated with the ball receiving cylinder body in the reset state;

[0011] The ball receiving auxiliary pusher is located on one side of the ball receiving cylinder body, and one end of the ball receiving auxiliary pusher can enter and exit the ball receiving channel to push the pigging ball out of the ball receiving channel when the ball receiving channel is in a state of being pushed out of the ball receiving cylinder body;

[0012] A ball receiving reciprocating drive mechanism and a ball receiving auxiliary reciprocating drive mechanism are respectively connected to the ball receiving pusher and the ball receiving auxiliary pusher.

[0013] In an optional embodiment, both the ball receiving pusher and the ball receiving auxiliary pusher are push rod body structures. A through channel is arranged on the ball receiving cylinder body along a direction perpendicular to its opening. The ball receiving pusher passes through the through channel and is in sliding fit with the through channel.

[0014] In an optional embodiment, the ball receiving channel is arranged on the ball receiving pusher along a direction parallel to the opening direction of the ball receiving cylinder body.

[0015] In an optional embodiment, the aperture of the ball receiving channel is larger than the outer diameter of the pigging ball.

[0016] In an optional embodiment, a retaining strip is arranged inside the ball receiving cylinder body. The retaining strip is located on one side of the ball receiving channel and corresponds to the outlet position of the ball receiving channel. The retaining strip is arranged near the downstream pipeline, and retaining teeth are arranged on the retaining strip.

[0017] In an optional embodiment, the ball receiving reciprocating drive mechanism includes a drive motor, a planetary commutator, a lead screw, and a nut sleeve. The drive motor is in transmission cooperation with the planetary commutator. The lead screw is connected to the power output shaft of the planetary commutator. The nut sleeve is in threaded fit on the outside of the lead screw, and the end of the nut sleeve is fixedly connected to the ball receiving pusher.

[0018] In an optional embodiment, the ball receiving auxiliary reciprocating drive mechanism includes an auxiliary motor, and the ball receiving auxiliary pusher is connected to the power output end of the auxiliary motor.

[0019] In an optional embodiment, a collection box is further included. The collection box is located at the outlet of the through channel of the ball receiving cylinder body, and the end of the ball receiving auxiliary pusher penetrates into the collection box.

[0020] In an optional embodiment, an upstream pressure transmitter, a downstream pressure transmitter, a displacement sensor, and a controller are further included. The upstream pressure transmitter and the downstream pressure transmitter are respectively installed on the upstream pipeline and the downstream pipeline and are located on both sides of the ball receiving cylinder body. Both the upstream pressure transmitter and the downstream pressure transmitter are connected to the controller. The drive motor and the auxiliary motor are both connected to the controller. The displacement sensor is installed at the outlet of the through pipeline of the collection cylinder body.

[0021] The second object of the present utility model is to provide an automatic pig receiving system applicable to natural gas gathering pipelines, which includes the pig receiving device described in any one of the above, and also includes an upstream pipeline, a downstream pipeline, a bypass pipeline, and a bypass ball valve. The pig receiving cylinder body of the pig receiving device is fixedly connected to both sides of the upstream pipeline and the downstream pipeline. The two ends of the bypass pipeline are respectively communicated with the upstream pipeline and the downstream pipeline. The bypass ball valve is installed on the bypass pipeline, and the bypass ball valve is connected to a controller.

[0022] The advantages and beneficial effects of the present utility model compared with the prior art are as follows:

[0023] The pig receiving device provided by the present utility model for natural gas gathering pipelines utilizes the mutual cooperation of the pig receiving pushing member and the pig receiving auxiliary pushing member. When it is found that the pigging ball blocks the pipeline, it is not necessary to empty the natural gas in the pipeline, nor to manually take out the pigging ball. Only need to start the pig receiving reciprocating driving mechanism and the pig receiving auxiliary reciprocating driving mechanism respectively, push the pig receiving channel out of the pig receiving cylinder body, and then use the pig receiving auxiliary pushing member to push the pigging ball out of the pig receiving channel, and then reset the pig receiving auxiliary pushing member and the pig receiving pushing member respectively to make the pig receiving channel unblocked with the upstream and downstream pipelines on both sides.

[0024] Since the present utility model does not need to empty the pipeline and does not need to manually take out the pigging ball from the pipeline, it reduces the operation risk and also avoids the pollution of the annular by the emptied natural gas and the waste of resources. And this process saves time and effort and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0026] Figure 1 It is the original pig receiving device of the pigging valve.

[0027] Figure 2 It is the overall structure diagram of a pig receiving device provided by the present utility model.

[0028] Figure 3 It is the structural schematic diagram when the pig receiving pushing member of a pig receiving device provided by the present utility model is retracted into the pig receiving cylinder body.

[0029] Figure 4 It is the structural schematic diagram when the pig receiving pushing member of a pig receiving device provided by the present utility model is pushed out of the pig receiving cylinder body.

[0030] Reference numerals in the drawings and the corresponding component names:

[0031] 1 - Inlet manual valve, 2 - Manual pigging valve, 3 - Outlet manual valve, 4 - Pig receiver cylinder, 5 - Driving motor, 6 - Pig receiver pusher, 7 - Auxiliary motor, 8 - Pig receiver auxiliary pusher, 9 - Bypass ball valve, 10 - Collection box, 11 - Upstream pressure transmitter, 12 - Downstream pressure transmitter, 13 - Displacement sensor, 14 - Controller, 15 - Retaining bar, 16 - Pig receiver channel, 17 - Pigging ball, 18 - Lead screw, 19 - Nut sleeve. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments and the descriptions thereof of the present utility model are only used to explain the present utility model and shall not be construed as a limitation to the present utility model.

[0033] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present utility model. However, it is obvious to those of ordinary skill in the art that: It is not necessary to employ these specific details to implement the present utility model. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present utility model.

[0034] Throughout the specification, the reference to "one embodiment", "embodiment", "one example" or "example" means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present utility model. Thus, the phrases "one embodiment", "embodiment", "one example" or "example" that appear throughout the specification do not necessarily all refer to the same embodiment or example. In addition, the specific features, structures or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and the drawings are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] In the description of the present utility model, the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the protection scope of the present utility model.

[0036] A pig receiver device applicable to natural gas gathering pipelines, comprising a pig receiver cylinder body 4, a pig receiving pusher 6, a pig receiving channel 16, and a pig receiving auxiliary pusher 8.

[0037] The pig receiver cylinder body 4 has two open ends, and a through hole in the middle. This hole is respectively communicated with the upstream pipeline and the downstream pipeline located on both sides of the pig receiver cylinder body 4. Natural gas flows from the upstream pipeline to the downstream pipeline. Connecting flanges are installed at the connection points of the upstream pipeline and the downstream pipeline. Both ends of the pig receiver cylinder body 4 are connected to the upstream and downstream pipelines through the connecting flanges, forming a sealed natural gas flow channel.

[0038] The pig receiving pusher 6 is on the side of the pig receiver cylinder body 4, and one end of the pig receiving pusher 6 penetrates through the pig receiver cylinder body 4 and extends to the outside of the pig receiver cylinder body 4. The pig receiving channel 16 is arranged through the pig receiving pusher 6. The pig receiving channel 16 can accommodate a pigging ball 17. The pig receiving channel 16 corresponds to the position of the through hole inside the pig receiver cylinder body 4 in the initial state and the reset state, forming a communicating channel through which natural gas can pass.

[0039] The pig receiving auxiliary pusher 8 is located on the side of the pig receiver cylinder body 4 away from the pig receiving pusher 6. One end of the pig receiving auxiliary pusher 8 can enter and exit the pig receiving channel 16. When the pig receiving channel 16 is pushed out of the pig receiver cylinder body 4 by the pig receiving pusher 6, the pigging ball 17 can be pushed out of the pig receiving channel 16, thus preventing the pigging ball 17 from blocking the pig receiving channel 16.

[0040] A pig receiving reciprocating drive mechanism and a pig receiving auxiliary reciprocating drive mechanism are respectively connected to the pig receiving pusher 6 and the pig receiving auxiliary pusher 8, which are respectively used to push the pig receiving pusher 6 to push the pig receiving channel 16 out of the pig receiver cylinder body 4 and at the same time pull the pig receiving pusher 6 back; and to push the pig receiving auxiliary pusher 8 into the pig receiving channel 16 to push out the pigging ball 17 and pull back the pig receiving auxiliary pusher 8.

[0041] In this embodiment, by the mutual cooperation of the pig receiving pusher 6 and the pig receiving auxiliary pusher 8, when it is found that the pigging ball 17 blocks the pipeline, it is not necessary to empty the natural gas in the pipeline, nor to manually remove the pigging ball 17. It only needs to respectively start the pig receiving reciprocating drive mechanism and the pig receiving auxiliary reciprocating drive mechanism, push the pig receiving channel 16 out of the pig receiver cylinder body 4, then use the pig receiving auxiliary pusher 8 to push the pigging ball 17 out of the pig receiving channel 16, and then respectively reset the pig receiving auxiliary pusher 8 and the pig receiving pusher 6 to make the pig receiving channel 16 unblocked with the upstream and downstream pipelines on both sides.

[0042] Since this utility model does not require emptying the pipeline and does not require manually removing the pigging ball 17 from the pipeline, it reduces the operation risk and also avoids the pollution of the environment by the emptied natural gas and the waste of resources. And this process saves time and effort and is simple to operate.

[0043] Furthermore, the ball receiving pusher 6 and the ball receiving auxiliary pusher 8 in this embodiment are both push rod structures and serve as push rods. And a through channel is provided in the ball receiving cylinder 4 along a direction perpendicular to its opening. The ball receiving pusher 6 passes through the through channel and is slidably engaged with the through channel. And the ball receiving channel 16 is arranged on the ball receiving pusher 6 along a direction parallel to the opening direction of the ball receiving cylinder 4. The aperture of the ball receiving channel 16 is also larger than the outer diameter of the pigging ball 17.

[0044] Due to the fact that the pigging ball 17 is pushed by the gas pressure difference up and down and will carry dirt and liquid into the ball receiving channel 16, a retaining strip 15 is provided inside the ball receiving cylinder 4 in this embodiment. The retaining strip 15 is located on one side of the ball receiving channel 16 and corresponds to the outlet position of the ball receiving channel 16. The retaining strip 15 is arranged near the downstream pipeline, and retaining teeth are provided on the retaining strip 15. In this way, the pigging ball 17 can be blocked to prevent it from moving into the downstream pipeline, and the entered dirt and liquid can continue to move downstream after passing through the retaining strip 15.

[0045] Embodiment 2:

[0046] Based on Embodiment 1, in this embodiment, the ball receiving reciprocating driving mechanism includes a driving motor 5, a planetary commutator, a lead screw 18, and a nut 19. The driving motor 5 is in transmission cooperation with the planetary commutator. The lead screw 18 is connected to the power output shaft of the planetary commutator. The nut 19 is in threaded cooperation with the outside of the lead screw 18. The end of the nut 19 is fixedly connected to the ball receiving pusher 6. When the driving motor 5 works, it drives the lead screw 18 to rotate, so that the nut 19 in threaded cooperation with it can move linearly along the outside of the lead screw 18, thereby driving the ball receiving pusher 6 to move, so that the ball receiving pusher 6 extends or contracts.

[0047] And the ball receiving auxiliary reciprocating driving mechanism includes an auxiliary motor 7, and the ball receiving auxiliary pusher 8 is connected to the power output end of the auxiliary motor 7. The auxiliary motor 7 drives the ball receiving auxiliary pusher 8 to extend or contract.

[0048] In order to facilitate the collection of the pigging ball 17, a collection box 10 is further included in this embodiment. The collection box 10 is located at the outlet of the through channel of the ball receiving cylinder 4, and the end of the ball receiving auxiliary pusher 8 penetrates into the collection box. It is used to collect the pigging ball 17.

[0049] In order to further improve the convenience of using the device, the pig receiver of this embodiment further includes an upstream pressure transmitter 11, a downstream pressure transmitter 12, a displacement sensor 13, and a controller 14. The upstream pressure transmitter 11 and the downstream pressure transmitter 12 are respectively installed on the upstream pipeline and the downstream pipeline, and are located on both sides of the pig receiver cylinder 4. The upstream pressure transmitter 11 and the downstream pressure transmitter 12 are both connected to the controller 14. The drive motor 5 and the auxiliary motor 7 are both connected to the controller 14. The displacement sensor 13 is installed at the outlet of the through pipeline of the collection cylinder.

[0050] Since fluids such as natural gas cannot pass through the pigging channel 16 temporarily, a certain pressure difference is formed between its upstream and downstream. The upstream pressure transmitter 11 and the downstream pressure transmitter 12 feedback the pressure signals to the controller 14. The controller 14 issues an instruction to make the drive motor 5 drive the screw to rotate, and the pigging pusher 6 moves to move the pigging channel 16 out of the pig receiver cylinder 4. When the front end of the pigging pusher 6 passes the displacement sensor 13, the displacement sensor 13 sends a signal to the controller 14. After a set time, the mouth of the pigging channel 16 is exactly opposite to the pigging auxiliary pusher 8. At this time, the controller 14 issues an instruction, and the auxiliary motor 7 starts to drive the pigging auxiliary pusher 8 to move to the right, pushing the pig 17 into the collection box 10. Then the pigging auxiliary pusher 8 retracts to the left to reset, and then the drive motor 5 drives the pigging pusher 6 to reset.

[0051] In this embodiment, through the mutual cooperation of the controller 14 with the pressure transmitter, the displacement sensor 13, and the motor, automatic pig receiving based on the pigging pressure difference induction of the natural gas gathering pipeline can be realized, and automatic pig receiving is achieved. There is no need for manual cleaning one by one. Since natural gas is a flammable and explosive medium, and some pipeline transmission pressures are high and sulfur-containing, the safety risk of manual operation is relatively large. In this embodiment, the risk of operation can be reduced through automatic induction pig receiving, and manpower is also saved, without the need for multiple people to cooperate.

[0052] Embodiment 3:

[0053] An automatic pig receiver system applicable to natural gas gathering pipelines includes the pig receiver of Embodiment 1 or Embodiment 2, and further includes an upstream pipeline, a downstream pipeline, a bypass pipeline, and a bypass ball valve 9. The pig receiver cylinder 4 of the pig receiver is fixedly connected to both sides of the upstream pipeline and the downstream pipeline. The two ends of the bypass pipeline are respectively connected to the upstream pipeline and the downstream pipeline. The bypass ball valve 9 is installed on the bypass pipeline, and the bypass ball valve 9 is connected to the controller 14.

[0054] When the pigging ball 17 enters the pig receiving channel 16, a certain pressure difference is formed between its upstream and downstream. The upstream pressure transmitter 11 and the downstream pressure transmitter 12 feedback the pressure signals to the controller 14, and the controller 14 issues an instruction to open the bypass ball valve 9 to ensure the normal fluid transportation in the pipeline. After the pigging ball 17 is removed, the bypass ball valve 9 is closed to complete the entire pig receiving operation.

[0055] The above specific implementation manners have further elaborated on the purpose, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific implementation manners of the present utility model and are not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pig receiver device applicable to natural gas gathering and transportation pipelines, characterized in that, It includes a pig receiver cylinder body (4), a pig receiver pusher (6), a pig receiver channel (16), and a pig receiver auxiliary pusher (8); The pig receiver cylinder body (4) has two open ends, which are respectively communicated with the upstream pipeline and the downstream pipeline located on both sides; One end of the pig receiver pusher (6) penetrates through the pig receiver cylinder body (4) and extends to the outside. The pig receiver channel (16) is arranged through the pig receiver pusher (6). The pig receiver channel (16) can accommodate a pigging ball (17), and the pig receiver channel (16) communicates with the pig receiver cylinder body (4) in the reset state; The pig receiver auxiliary pusher (8) is located on one side of the pig receiver cylinder body (4). One end of the pig receiver auxiliary pusher (8) can enter and exit the pig receiver channel (16) to push the pigging ball (17) out of the pig receiver channel (16) when the pig receiver channel (16) is in the state of being pushed out of the pig receiver cylinder body (4); A pig receiver reciprocating drive mechanism and a pig receiver auxiliary reciprocating drive mechanism are respectively connected to the pig receiver pusher (6) and the pig receiver auxiliary pusher (8).

2. The pig receiver device applicable to natural gas gathering pipelines according to claim 1, wherein Both the pig receiver pusher (6) and the pig receiver auxiliary pusher (8) are push rod structures. A through channel is arranged in the pig receiver cylinder body (4) along the direction perpendicular to its opening direction. The pig receiver pusher (6) passes through the through channel and is slidably matched with the through channel.

3. The pig receiver device applicable to natural gas gathering pipelines according to claim 1, wherein The pig receiver channel (16) is arranged on the pig receiver pusher (6) along the direction parallel to the opening direction of the pig receiver cylinder body (4).

4. The pig receiver device applicable to natural gas gathering pipelines according to claim 1, characterized in that, The aperture of the pig receiver channel (16) is larger than the outer diameter of the pigging ball (17).

5. A pig receiver device applicable to a natural gas gathering pipeline according to any one of claims 1 to 4, characterized in that, A retaining strip (15) is arranged inside the pig receiver cylinder body (4). The retaining strip (15) is located on one side of the pig receiver channel (16) and corresponds to the outlet position of the pig receiver channel (16). The retaining strip (15) is arranged near the downstream pipeline, and retaining teeth are arranged on the retaining strip (15).

6. The pig receiver device applicable to natural gas gathering pipelines according to claim 5, characterized in that, The pig receiver reciprocating drive mechanism includes a drive motor (5), a planetary commutator, a lead screw (18), and a nut sleeve (19). The drive motor (5) is in transmission cooperation with the planetary commutator. The lead screw (18) is connected to the power output shaft of the planetary commutator. The nut sleeve (19) is in threaded cooperation with the outside of the lead screw (18). The end of the nut sleeve (19) is fixedly connected to the pig receiver pusher (6).

7. The pig receiver device applicable to natural gas gathering pipelines according to claim 6, wherein The pig receiver auxiliary reciprocating drive mechanism includes an auxiliary motor (7), and the pig receiver auxiliary pusher (8) is connected to the power output end of the auxiliary motor (7).

8. A pig receiver device applicable to a natural gas gathering pipeline according to claim 7, characterized in that, It further includes a collection box (10). The collection box (10) is located at the outlet of the through channel of the pig receiver cylinder body (4), and the end of the pig receiver auxiliary pusher (8) penetrates into the collection box.

9. A pig receiver device applicable to a natural gas gathering pipeline according to claim 7 or 8, characterized in that, It further includes an upstream pressure transmitter (11), a downstream pressure transmitter (12), a displacement sensor (13), and a controller (14). The upstream pressure transmitter (11) and the downstream pressure transmitter (12) are respectively installed on the upstream pipeline and the downstream pipeline, and are located on both sides of the pig receiver cylinder (4). The upstream pressure transmitter (11) and the downstream pressure transmitter (12) are both connected to the controller (14). The drive motor (5) and the auxiliary motor (7) are both connected to the controller (14). The displacement sensor (13) is installed at the outlet of the through pipeline of the pig receiver cylinder.

10. An automatic pig receiver system applicable to natural gas gathering pipelines, characterized in that, It includes the pig receiver device according to any one of claims 1 to 9, and further includes an upstream pipeline, a downstream pipeline, a bypass pipeline, and a bypass ball valve (9). The pig receiver cylinder (4) of the pig receiver device is fixedly connected to both sides of the upstream pipeline and the downstream pipeline. The two ends of the bypass pipeline are respectively communicated with the upstream pipeline and the downstream pipeline. The bypass ball valve (9) is installed on the bypass pipeline, and the bypass ball valve (9) is connected to the controller (14).

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