Automatic pipeline cleaning and pressure maintaining device

Abstract

The utility model discloses a kind of automatic cleaning pressure maintenance devices of pipeline, it is related to rail vehicle overhauling technical field, the technical problem that existing large, fixed pressure maintenance equipment is inconvenient to move and test beside long-distance train is solved;The utility model includes cabinet, the inside of cabinet is provided with chamber, control system and gas supercharging assembly are sequentially arranged from top to bottom in the inside of chamber, the upper portion of one side of cabinet is also provided with operation module, and operation module and gas supercharging assembly are electrically connected with control system respectively;Second interface is provided on the lateral wall of cabinet, control system, operation module and gas supercharging assembly are electrically connected with external power supply through second interface;The gas inlet end of gas supercharging assembly is connected with external gas source pipeline through first interface, and the gas outlet end of gas supercharging assembly is connected with vehicle pipeline through pipeline interface;The lower part of cabinet is provided with several pulleys;Its purpose is to make the whole device become a movable whole.

Description

Technical Field

[0001] This utility model belongs to the field of rail vehicle maintenance technology, specifically relating to an automatic pipeline cleaning and pressure maintaining device. Background Technology

[0002] Pipeline cleaning and pressure holding tests are a crucial process in the manufacturing and maintenance of rail vehicles. The specific steps involve using dry, clean compressed air to purge the pipelines of new or repaired vehicles to remove residual welding slag, oil, moisture, and other impurities from the manufacturing and installation processes. This ensures that subsequently installed precision pneumatic components are not contaminated and may malfunction. Afterward, a certain pressure of gas is introduced into the cleaned pipeline system, and the valves are closed to maintain the pressure. By monitoring the pressure drop over a period of time, leaks in the pipeline system can be identified. Therefore, the pipeline pressure holding and cleaning step is vital for ensuring train operation safety, especially the reliability of the braking system. Key aspects: Currently available automated fixed testing equipment typically integrates a small booster pump, a simple electrical control system, pressure sensors, and solenoid valves. It can achieve functions such as automatic inflation, automatic stop after reaching the set pressure, and timed pressure maintenance. However, such equipment is usually designed as a fixed or large trolley type, which is bulky and heavy. It is usually placed at a fixed workstation in the workshop. Operators need to pull hoses that are tens or even hundreds of meters long from the fixed workstation to the connection point at the other end of the train, or they need to push the entire train car to the equipment workstation. This process is time-consuming and labor-intensive, and cannot meet the testing needs of long train formations. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an automatic pipeline cleaning and pressure-holding device. The device is controlled by an operation module and a control system, with a gas pressurization component performing the cleaning and pressure-holding functions. The second and first interfaces define the access methods for external power and external gas sources, ensuring the device's independent operation capability. The control system, gas pressurization component, and other core components are integrated into a single chassis, and the lower movable component design makes the entire device a mobile unit, solving the problem of large, fixed pressure-holding equipment being inconvenient to move for testing alongside long-distance trains.

[0004] The technical solution adopted in this utility model is as follows:

[0005] An automatic pipeline cleaning and pressure-maintaining device includes a chassis with an internal chamber. Inside the chamber, a control system and a gas pressurization component are arranged sequentially from top to bottom. An operation module is also located on the upper part of one side of the chassis. The operation module and the gas pressurization component are electrically connected to the control system. A second interface is provided on the side wall of the chassis, through which the control system, operation module, and gas pressurization component are electrically connected to an external power source. The air inlet of the gas pressurization component is connected to an external air source pipeline via a first interface, and the air outlet of the gas pressurization component is connected to a vehicle pipeline via a pipeline interface. Several moving components are located at the lower part of the chassis.

[0006] By adopting the above technical solution, it is clarified that the device is controlled by an operation module and a control system, and the gas pressurization component performs the cleaning and pressure-holding functions. The access methods of external power supply and external gas source are defined through the second interface and the first interface, respectively, ensuring the independent operation capability of the equipment. The core components such as the control system and the gas pressurization component are integrated into a single chassis, and the design of the lower movable component makes the entire device a mobile whole, solving the problem that large, fixed pressure-holding equipment is inconvenient to move and test next to long-distance trains.

[0007] Furthermore, the moving component can be either a pulley or a flatbed trolley.

[0008] Preferably, the gas booster assembly includes a shut-off valve, a filter and pressure regulating device, a booster pump, an air tank, and a solenoid valve assembly connected in sequence by pipelines. The air inlet of the shut-off valve is connected to the external air source pipeline through the first interface, and the air outlet of the solenoid valve assembly is connected to the vehicle pipeline through a pipeline interface.

[0009] By adopting the above technical solution, a complete pneumatic path from gas source to output is set in detail, ensuring the cleanliness, pressure stability and storability of the gas source. The shut-off valve can safely isolate the gas, the filter and pressure regulating device can purify and initially stabilize the pressure, the booster pump can perform core boosting, the gas storage tank can store energy and buffer, and the solenoid valve assembly can precisely control the gas supply and shut-off. Together, they ensure that high-pressure gas can be output to the vehicle pipeline on demand and stably.

[0010] Preferably, the solenoid valve assembly is provided in multiple ways, and each solenoid valve assembly includes two solenoid valves connected in parallel, one of which has a flow rate greater than the other. A pressure transmitter is provided on the pipeline connected in series with the solenoid valve with the faster flow rate. Each parallel pipeline is connected to the gas storage tank pipeline through a third interface.

[0011] By adopting the above technical solution and setting up two parallel air paths, fast and slow, the system can freely switch between two modes: rapid inflation and precise pressure holding or pressure replenishment. This greatly improves testing efficiency and ensures the accuracy of the final pressure holding. The pressure transmitter is used to monitor the pressure in real time and feed the signal back to the control system, thereby realizing the automatic opening and closing of the solenoid valve and achieving automatic pressure holding control.

[0012] Preferably, a main power switch is provided on the side wall of the chassis, and the main power switch is located on the circuit between the control system, the operation module, the gas pressurization component and the external power supply.

[0013] By adopting the above technical solution, a main power switch is set up, which facilitates physical isolation of the entire device for powering on and off, thereby improving the safety of equipment operation and maintenance.

[0014] Preferably, the operation module includes a display screen, a second indicator light, and operation buttons. The upper part of the chassis is also hinged with a first cover plate, and the display screen, the second indicator light, and the operation buttons are disposed on the first cover plate.

[0015] The above technical solution provides an intuitive human-machine interface through a display screen, indicator lights and operation buttons. The hinged first cover can protect the expensive control system from dust and impacts when not in operation, while also making the chassis look cleaner.

[0016] Preferably, a first indicator light is provided on the top of the chassis, and the first indicator light is electrically connected to the control system.

[0017] By adopting the above technical solution, the indicator light set on the top of the chassis is used to indicate the pressure holding status. It can be observed from a distance, which makes it convenient for the operator to quickly understand the status of the equipment while working around the equipment during pressure holding, thus improving convenience.

[0018] Preferably, the first interface, the second interface, and the pipeline interface are all located on the same side of the chassis. A removable third cover is provided on the side wall of the chassis on the same side as the second interface. A storage box is provided on the side of the third cover away from the chamber.

[0019] By adopting the above technical solution, all interfaces, namely air input, electrical input and air output, are concentrated on one side, which makes it convenient for users to connect all lines and cables from one direction, avoiding wiring around the chassis, making the operation more convenient and standardized; the storage box can be used to store extended cables or air pipes, making them easy to access and store.

[0020] Preferably, a handle is provided on the side wall of the chassis. The handle includes a crossbar and two connecting rods. One end of the connecting rod is fixed to the side wall of the chassis, and the other end of the connecting rod is fixed to the crossbar. The length of the crossbar is greater than the distance between the two connecting rods, and the handle is located on the same side of the second interface.

[0021] The above technical solution facilitates dragging the chassis, provides a leverage point for chassis movement, and forms a cable winder. Users can wrap excessively long power cords around the handle crossbar for storage and organization. The structure of the crossbar being longer than the distance between the two connecting rods prevents the cable from slipping off the handle when wrapped around it; further increasing the extension of the extension cord and extending the travel distance.

[0022] Preferably, a second cover plate is hinged to the rear side of the chassis, and the second cover plate is connected to the chassis by a first latch.

[0023] Using the above technical solution, the rear cover, with its hinged and locking design, allows for easy opening and installation, debugging, and maintenance of components inside the chassis.

[0024] Preferably, a fourth cover plate is hinged to the front side of the chassis, the fourth cover plate is connected to the chassis via a second latch, and the fourth cover plate is located at the lower part of the operation module.

[0025] Using the above technical solution, the fourth cover plate located at the bottom of the operation module can be used to perform regular maintenance on the gas booster component at any time without having to open the chassis from the rear.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0027] The device is controlled by an operation module and a control system. The gas pressurization component performs the cleaning and pressure-holding functions. The access methods for external power and external gas sources are defined through the second and first interfaces, respectively, ensuring the independent operation capability of the equipment. The core components such as the control system and the gas pressurization component are integrated into a single chassis. Through the design of the lower movable component, the entire device becomes a mobile unit, solving the problem that large, fixed pressure-holding equipment is inconvenient to move for testing next to long-distance trains. Attached Figure Description

[0028] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the internal structure of an automatic pipeline cleaning and pressure maintaining device according to this utility model;

[0030] Figure 2This is a schematic diagram of one side of an automatic pipeline cleaning and pressure maintaining device according to this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the fourth cover plate of an automatic pipeline cleaning and pressure maintaining device in this utility model;

[0032] Figure 4 This is a schematic diagram of the air circuit structure of an automatic pipeline cleaning and pressure maintaining device according to this utility model.

[0033] Figure Labels

[0034] 1-Chassis, 2-First cover plate, 3-First indicator light, 4-Display screen, 5-Second indicator light, 6-Operation button, 7-Second cover plate, 8-First latch, 9-Pulley, 10-Main power switch, 11-Handle, 12-Placement box, 13-Third cover plate, 14-Pipeline interface, 15-First interface, 16-Second interface, 17-Control system, 18-Shelf, 19-Booster pump, 20-Third interface, 21-Fourth cover plate, 22-Stop valve, 23-Air tank, 24-Solenoid valve, 25-Pressure transmitter, 26-Filter and pressure regulating device. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] The following is combined Figures 1-4 This utility model will be described in detail.

[0037] Example 1

[0038] An automatic pipeline cleaning and pressure-maintaining device, as shown in the attached document. Figure 1The system includes a chassis 1, which contains a chamber. Inside the chamber, from top to bottom, are a control system 17 and a gas pressurization assembly. An operation module is also located on the upper part of one side of the chassis 1. The operation module and the gas pressurization assembly are electrically connected to the control system 17. A second interface 16 is located on the side wall of the chassis 1, through which the control system 17, the operation module, and the gas pressurization assembly are electrically connected to an external power source. The inlet of the gas pressurization assembly is connected to an external gas source pipeline via a first interface 15, and the outlet of the gas pressurization assembly is connected to... Port 14 is connected to the vehicle pipeline; several pulleys 9 are provided at the bottom of the housing 1; it is clear that the device is controlled by the operation module and the control system 17, and the gas pressurization component performs the cleaning and pressure holding function. The access methods of external power supply and external air source are defined by the second interface 16 and the first interface 15 respectively, ensuring the independent operation capability of the equipment. The core components such as the control system 17 and the gas pressurization component are integrated into a housing 1, and the design of the pulleys 9 at the bottom makes the whole device a mobile whole, solving the problem that large, fixed pressure holding equipment is inconvenient to move and test next to long-distance trains.

[0039] The operation module is used to set parameters, send commands, and display status information.

[0040] There are four pulleys 9, which are located at the four corners of the bottom of the chassis 1.

[0041] In this embodiment, refer to the appendix. Figure 4 The gas booster assembly includes a shut-off valve 22, a filter and pressure regulating device 26, a booster pump 19, a gas storage tank 23, and a solenoid valve 24 assembly connected in sequence via pipelines. The air inlet of the shut-off valve 22 is connected to the external gas source pipeline through the first interface 15, and the air outlet of the solenoid valve 24 assembly is connected to the vehicle pipeline through the pipeline interface 14. A complete pneumatic path from the gas source to the output is set in detail, ensuring the cleanliness, pressure stability, and storability of the gas source. The shut-off valve 22 can safely isolate the gas, the filter and pressure regulating device 26 can purify and initially stabilize the pressure, the booster pump 19 can perform core boosting, the gas storage tank 23 can store energy and buffer, and the solenoid valve 24 assembly can precisely control the gas supply and shut-off, together ensuring that high-pressure gas can be output to the vehicle pipeline as needed and stably.

[0042] Inside the chassis 1, between the control system 17 and the gas boosting assembly, there is a shelf 18. The length of the control system 17 is less than the length of the shelf 18. The boosting pump 19 is installed on the upper part of the shelf 18 on the inner wall of the chassis 1.

[0043] Among them, the installation positions of the components such as the shut-off valve 22, the filter pressure regulating device 26, the booster pump 19, the air tank 23, and the solenoid valve 24 are set inside the chassis 1 according to the specific situation. Those skilled in the art are familiar with the installation methods, so they will not be described in detail here.

[0044] In this embodiment, multiple solenoid valve 24 assemblies are provided, each including two solenoid valves 24 connected in parallel, one of which has a higher flow rate than the other. A pressure transmitter 25 is installed on the pipeline connected in series with the faster-flowing solenoid valve 24. Each parallel pipeline is connected to the gas tank 23 pipeline through a third interface 20. By setting up two parallel gas paths, one fast and one slow, the system can freely switch between two modes: rapid inflation and precise pressure holding or pressure replenishment. This greatly improves testing efficiency and ensures the accuracy of the final pressure holding. The pressure transmitter 25 is used to monitor the pressure in real time and feed the signal back to the control system 17, thereby realizing the automatic opening and closing of the solenoid valves 24 and achieving automatic pressure holding control.

[0045] Example 2

[0046] In this embodiment, a main power switch 10 is provided on the side wall of the chassis 1. The main power switch 10 is located on the circuit between the control system 17, the operation module, the gas pressurization component, and the external power supply. The main power switch 10 facilitates physical isolation of the entire device for powering on and off, thereby improving the safety of equipment operation and maintenance.

[0047] Example 3

[0048] In this embodiment, refer to the appendix. Figure 2 The operation module includes a display screen 4, a second indicator light 5, and an operation button 6. A first cover plate 2 is also hinged to the upper part of the chassis 1. The display screen 4, the second indicator light 5, and the operation button 6 are located on the first cover plate 2. The display screen 4, the indicator light 5, and the operation button 6 provide an intuitive human-machine interface. The hinged first cover plate 2 can protect the expensive control system 17 when not in operation, preventing dust and impacts, while also making the appearance of the chassis 1 cleaner.

[0049] The first cover plate 2 and the chassis 1 are also provided with locking buckles for fixing. The connection method between the cover plate and the chassis 1 is existing technology and will not be described in detail here.

[0050] Example 3

[0051] In this embodiment, a first indicator light 3 is provided on the top of the chassis 1, and the first indicator light 3 is electrically connected to the control system 17. The indicator light on the top of the chassis 1 is used to indicate the pressure holding status and can be observed from a distance. This makes it convenient for the operator to quickly understand the status of the equipment while working around the equipment during pressure holding, thus improving convenience.

[0052] Example 4

[0053] In this embodiment, refer to the appendix. Figure 3 The first interface 15, the second interface 16, and the pipeline interface 14 are all located on the same side of the chassis 1. A removable third cover plate 13 is provided on the side wall of the chassis 1 on the same side as the second interface 16. A storage box 12 is provided on the side of the third cover plate 13 away from the chamber. All interfaces, namely air input, electrical input, and air output, are concentrated on one side, which makes it convenient for users to connect all lines and cables from one direction, avoiding wiring around the chassis 1, making the operation more convenient and standardized. The storage box 12 can be used to store extended cables or air pipes, making them easy to access and store.

[0054] The third cover plate 13 is connected to the chassis 1 body at its four corners by threads. The third cover plate 13 and the chassis 1 body frame are provided with corresponding screw holes, and the screw holes are provided with matching bolts.

[0055] In this embodiment, a handle 11 is provided on the side wall of the chassis 1. The handle 11 includes a crossbar and two connecting rods. One end of the connecting rod is fixed to the side wall of the chassis 1, and the other end of the connecting rod is fixed to the crossbar. The length of the crossbar is greater than the distance between the two connecting rods. The handle 11 is located on the same side as the second interface 16. This facilitates dragging the chassis 1, provides a leverage point for the movement of the chassis 1, and also constitutes a cable winder. Users can wind excessively long power cords around the crossbar of the handle 11 for storage and organization. The structure that the length of the crossbar is greater than the distance between the two connecting rods prevents the cable from slipping off the handle 11 when it is wound on it. This further increases the extension of the extension cord and increases the travel distance.

[0056] Example 5

[0057] In this embodiment, a second cover plate 7 is hinged to the rear side of the chassis 1, and the second cover plate 7 is connected to the chassis 1 by a first latch 8. The rear cover plate with hinge and latch design can be easily opened to install, debug and maintain the components inside the chassis 1.

[0058] Example 6

[0059] In this embodiment, a fourth cover plate 21 is hinged to the front side of the chassis 1. The fourth cover plate 21 is connected to the chassis 1 by a second latch and is located at the lower part of the operation module. The fourth cover plate 21 located at the lower part of the operation module can perform regular maintenance on the gas pressurization component at any time without having to open the chassis 1 from the rear.

[0060] The method of using an automatic pipeline cleaning and pressure-maintaining device includes the following steps:

[0061] Step 1: Hold the handle 11 on the side of the chassis 1 and use the pulleys 9 at the bottom of the chassis 1 to easily move the entire device to a suitable working position next to the rail vehicle to be tested. Connect the dry and clean compressed air supply pipe provided by the workshop to the first interface 15 installed on the side of the chassis 1. Insert one end of the external power cable into the second interface 16 on the side of the chassis 1 and connect the other end to the workshop power socket. Connect the hose leading to the pipeline to the vehicle to be tested to the pipeline interface 14 on the chassis 1. After ensuring that all connections are correct, turn on the main power switch 10 on the side wall of the chassis 1 to power on the entire device.

[0062] Step 2: Interact with the machine by operating button 6 and display screen 4, set the target pressure value, pressure holding time, pressure drop alarm threshold and other parameters required for this test, observe display screen 4 and second indicator light 5 to confirm that the equipment self-test is correct and is in standby ready state;

[0063] Step 3: Select the "cleaning" or "purge" mode on the operation module. The control system 17 issues a command to open the shut-off valve 22, start the booster pump 19, and open the high-flow solenoid valve 24 in the control solenoid valve 24 assembly. The compressed air supplied by the external air source passes through the filter and pressure regulating device 26 for purification, dust removal, and water removal, and is boosted by the booster pump 19. Then, it is injected into the vehicle pipeline at high speed through the opened high-flow solenoid valve 24 and pipeline interface 14 to powerfully purge the pipeline and remove impurities such as welding slag, oil, and moisture. The purging process continues for a period of time or until the operator believes that the pipeline is clean. After the operation module is activated or the preset time is reached, the cleaning process is stopped, the booster pump 19 stops working, and the high-flow solenoid valve 24 closes.

[0064] Step 4: Select "Pressure Holding" or "Test" mode on the operation module. Control system 17 starts booster pump 19 and opens high-flow solenoid valve 24 to rapidly inflate the vehicle pipeline, causing the pressure to rise quickly. The first indicator light 3 on the top of the housing 1 flashes, indicating that inflation is in progress. When pressure transmitter 25 detects that the pipeline pressure is close to the preset target pressure value, control system 17 issues a command to close high-flow solenoid valve 24 and open low-flow solenoid valve 24. Booster pump 19 operates intermittently or at lower power as needed. The precise coordination between low-flow solenoid valve 24 and booster pump 19 slowly and accurately adjusts the pipeline pressure to the final target pressure value. Once the pressure accurately reaches the target value, control system 17... The system will shut off the small-flow solenoid valve 24 and booster pump 19, cutting off the gas supply, and the test system will enter the pressure holding state. The first indicator light 3 on the top of the chassis 1 will remain green, indicating that the system is holding pressure. During the entire pressure holding time, the control system 17 will continuously monitor the pressure changes in the pipeline through the pressure transmitter 25 and display the pressure value and pressure curve on the display screen 4 in real time. If the pressure drop does not exceed the preset alarm threshold within the set pressure holding time, the test is qualified, the device will sound a prompt, and the second indicator light 5 will display a green pass signal. If the pressure drop exceeds the threshold within the pressure holding time, it is determined that there is a leak, the device will sound an alarm, and the second indicator light 5 will display a red alarm signal, prompting the operator to find the leak point.

[0065] Step 5: After the test is completed, use the "pressure relief" function on the operation module to safely release the high-pressure gas inside the vehicle pipeline and device into the atmosphere. After confirming that the pressure gauge shows zero, disconnect the hose, external air supply pipe and external power cord connected to the vehicle pipeline in sequence. Wrap the used power cord around the crossbar of handle 11 for storage and organization. Excess pipelines or cables can be placed in the storage box 12. Turn off the main power switch 10.

[0066] It should be noted that:

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipeline automatic cleaning and pressure maintaining device, characterized in that, The system includes a chassis (1), inside which is a chamber. Inside the chamber, from top to bottom, are a control system (17) and a gas booster assembly. An operation module is also provided on the upper part of one side of the chassis (1). The operation module and the gas booster assembly are electrically connected to the control system (17). A second interface (16) is provided on the side wall of the chassis (1). The control system (17), the operation module, and the gas booster assembly are electrically connected to an external power source through the second interface (16). The air inlet of the gas booster assembly is connected to an external air source pipeline through a first interface (15). The air outlet of the gas booster assembly is connected to a vehicle pipeline through a pipeline interface (14). Several moving components are provided on the lower part of the chassis (1).

2. The automatic pipeline cleaning and pressure maintaining device according to claim 1, characterized in that, The gas booster assembly includes a shut-off valve (22), a filter and pressure regulating device (26), a booster pump (19), an air tank (23), and a solenoid valve (24) assembly connected in sequence by pipelines. The air inlet of the shut-off valve (22) is connected to the external air source pipeline through the first interface (15), and the air outlet of the solenoid valve (24) assembly is connected to the vehicle pipeline through the pipeline interface (14).

3. The automatic pipeline cleaning and pressure maintaining device according to claim 2, characterized in that, The solenoid valve (24) assembly is provided in multiple ways. Each solenoid valve (24) assembly includes two solenoid valves (24) connected in parallel. One solenoid valve (24) has a flow rate greater than the other solenoid valve (24). A pressure transmitter (25) is provided on the pipeline connected in series with the solenoid valve (24) with the faster flow rate. Each parallel pipeline is connected to the gas storage tank (23) pipeline through a third interface (20).

4. The automatic pipeline cleaning and pressure maintaining device according to claim 1, characterized in that, A main power switch (10) is provided on the side wall of the chassis (1). The main power switch (10) is located on the circuit between the control system (17), the operation module, and the gas booster assembly and the external power supply.

5. The automatic pipeline cleaning and pressure maintaining device according to claim 1, characterized in that, The operation module includes a display screen (4), a second indicator light (5), and an operation button (6). The upper part of the chassis (1) is also hinged with a first cover plate (2). The display screen (4), the second indicator light (5), and the operation button (6) are located on the first cover plate (2).

6. The automatic pipeline cleaning and pressure-maintaining device according to claim 1, characterized in that, The top of the chassis (1) is provided with a first indicator light (3), which is electrically connected to the control system (17).

7. The automatic pipeline cleaning and pressure maintaining device according to claim 2, characterized in that, The first interface (15), the second interface (16) and the pipeline interface (14) are all located on the same side of the chassis (1). A removable third cover plate (13) is provided on the side wall of the chassis (1) on the same side as the second interface (16). A placement box (12) is provided on the side of the third cover plate (13) away from the chamber.

8. The automatic pigging pressure maintaining device of claim 7, wherein, A handle (11) is provided on the side wall of the chassis (1). The handle (11) includes a crossbar and two connecting rods. One end of the connecting rod is fixed to the side wall of the chassis (1), and the other end of the connecting rod is fixed to the crossbar. The length of the crossbar is greater than the distance between the two connecting rods. The handle (11) is located on the same side as the second interface (16).

9. The automatic pipeline cleaning and pressure maintaining device according to claim 1, characterized in that, The rear side of the chassis (1) is hinged with a second cover plate (7), which is connected to the chassis (1) by a first latch (8).

10. The automatic pipeline cleaning and pressure maintaining device according to claim 1, characterized in that, The front side of the chassis (1) is hinged with a fourth cover plate (21), which is connected to the chassis (1) by a second latch. The fourth cover plate (21) is located at the lower part of the operation module.

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