Pipeline switching device and detection method

Abstract

The invention discloses a switching pipeline device and a detection method, and relates to the technical field of switching discs. Comprising a valve terminal, a conversion disc, first adapter pipe connectors, second adapter pipe connectors, liquid inlets, liquid outlets and connecting air pipes, the first adapter pipe connectors and the second adapter pipe connectors are arranged in a row and installed on one side of the conversion disc, and the liquid inlets and the liquid outlets are arranged in a row and installed on the other side of the conversion disc; air pipe connectors are installed on the two sides, corresponding to the first adapter pipe connector, the second adapter pipe connector, the liquid inlet and the liquid outlet, of the conversion disc. According to the invention, the valve terminal emits compressed air to detect the interface connection state in turn, so that various complex one-to-one and one-to-many connection pipe connection conditions can be accurately judged, the limitation of a traditional approach switch mode in one-to-many connection pipe and complex connection is effectively solved, and the approach switch mode is also different from a traditional pipeline connection mode; a specially-made hard switching pipeline is not needed any more, the connecting pipeline can be replaced according to needs, and more convenience is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of adapter plates, and in particular to an adapter pipeline device and a detection method. Background Art

[0002] A liquid transfer plate is a device used for liquid transfer, usually in the shape of a plate, which has multiple interfaces or channels that can guide, divert or transfer liquid medicine from one container to other containers.

[0003] The traditional adapter plate identifies the pipeline by installing a proximity switch at the location where the pipeline passes. There will be a signal after the pipeline is connected. The traditional adapter plate requires a special pipeline, and the position of the proximity switch needs to be designed according to the position of the special pipeline. After completion, the position is fixed and cannot be changed. In addition, due to the limitation of the pipeline material, multiple pipelines are required for connection under complex connection methods, and the traditional connecting pipe method is a hard pipe connection. Under multiple pipe connections, the shape of the pipeline needs special design. In other words, the traditional adapter plate cannot easily replace the connection of the adapter plate, and the proximity switch needs to be designed according to the connecting pipe to detect whether the pipeline is connected. The operability and economy are poor. In view of this situation, the present invention proposes a new solution to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a transfer pipe device and a detection method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a transfer pipeline device, comprising: Valve island, conversion plate, transfer pipe interface 1, transfer pipe interface 2, liquid inlet, liquid outlet and connecting air pipe; The transfer pipe interface 1 and the transfer pipe interface 2 are respectively arranged in a row and installed on one side of the conversion disk, and the liquid inlet and the liquid outlet are respectively arranged in a row and installed on the other side of the conversion disk; Air pipe interfaces are installed on both sides of the conversion disk corresponding to each transfer pipe interface 1, transfer pipe interface 2, near the liquid inlet and the liquid outlet. The air pipe interface near the liquid inlet is used to install the air pipe pipe 1, and the air pipe interface near the liquid outlet is used to install the air pipe pipe 2. A transfer hose is provided between the transfer pipe interface 1 and the transfer pipe interface 2, and the air pipe pipe 1 and the air pipe pipe 2 are both connected to the valve island; A connecting air pipe is installed on the transfer hose through a fixing piece, and two ends of the connecting air pipe are connected to air pipe interfaces near two ends of the transfer hose through quick connectors.

[0006] Further to this solution, each transfer tube interface 1 is respectively connected to the corresponding liquid inlet, each transfer tube interface 2 is respectively connected to the corresponding liquid outlet, the liquid inlet is connected to the pipeline medicine liquid inlet, and the liquid outlet is connected to the pipeline medicine liquid outlet.

[0007] Further regarding this solution, the valve island includes an integrated box body, on which a solenoid valve assembly is provided, and on which a plurality of compressed air transmitting ports and compressed air receiving ports are provided, and the number of the compressed air transmitting ports and the compressed air receiving ports respectively corresponds to the number of transfer tube interface one and transfer tube interface two.

[0008] Further regarding this solution, a valve control component is provided at the transfer tube interface, and the valve control component includes a ball valve 1 arranged between the transfer tube interface 1 and the conversion disk, a fixing frame is installed on the valve shell of the ball valve 1, a driving source 1 is installed on the fixing frame, and the output end of the driving source 1 is connected to the valve body of the ball valve 1.

[0009] Furthermore, with regard to this solution, a branch pipe is fixed on the transfer pipe interface 1, a valve column is rotatably installed in the branch pipe, a compressed gas bottle is installed on one side of the branch pipe, and a notch is provided on the surface of the valve column, through which the gas in the compressed gas bottle flows to the transfer pipe interface 1.

[0010] Further to this solution, a sprocket two is rotatably installed on the top of the branch pipe, and the sprocket two is coaxially fixed with the valve column. A sprocket one is also fixedly installed on the output end of the driving source one, and the sprocket one and the sprocket two are connected by a chain.

[0011] Further regarding this solution, a drainage component is provided at the second transfer pipe interface, and the drainage component includes a ball valve 2 arranged between the second transfer pipe interface and the conversion disk. The valve housing of the ball valve 2 is equipped with a mounting frame, and the mounting frame is equipped with a driving source 2 that is synchronously controlled with the driving source 1.

[0012] Further to this scheme, a sleeve is fixed below the second transfer tube interface, the sleeve is connected with the connection of the second transfer tube interface, a round-head valve block is provided at the connection to seal the connection between the sleeve and the second transfer tube interface, a limit rod is fixed at the bottom of the round-head valve block, the bottom of the sleeve is sealed, the limit rod passes through the bottom of the sleeve, a reset spring is provided on the surface of the limit rod, the reset spring is provided in the sleeve, and a bypass pipe is provided at the sleeve near the second transfer tube interface.

[0013] A method for detecting a transfer pipe, using the above transfer pipe device, comprises the following steps: Step 1: Set the connection path of the adapter plate; Step 2: Install the adapter hose and connect the air pipe; Step 3: Send compressed air through the valve island to determine the connection status of the pipe.

[0014] Further to this solution, in step 3, the compressed air is emitted through the valve island to determine the connection status of the pipe, which includes the following steps: S1: Compressed air is emitted from the compressed air emission port in sequence through the solenoid valve components of the valve island; S2: The corresponding compressed air receiving port on the solenoid valve assembly is sensed by a micro-pressure switch to determine whether there is compressed air reflux. The corresponding compressed air receiving port is sensed by the micro-pressure switch to determine that the pipe is connected.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The transfer pipe device and detection method can transmit compressed air through the valve island to patrol the detection interface connection status, and can accurately determine various complex one-to-one and one-to-many pipe connection situations, effectively solving the limitations of traditional proximity switches in one-to-many pipes and complex connections. This also distinguishes it from traditional pipe connection methods. It no longer requires special hard transfer pipes, and the connecting pipes can be replaced as needed, which is more convenient.

[0016] At the same time, the valve control components and drain components at the adapter hose interface can discharge the liquid in the adapter hose with the help of compressed gas when the pipeline is closed, and discharge the liquid into a closed recovery tank through a special structure. It is suitable for corrosive liquid recovery and ensures the safety of operators. The use of hose connection can avoid problems such as easy collision of hard pipe connection and difficulty in installing proximity switches. The overall device has strong controllability and high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the detection method of the present invention; Figure 2 It is a schematic diagram of an example structure of an embodiment of the present invention; Figure 3 It is a schematic diagram of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the valve control component of the present invention; Figure 5 It is a schematic diagram of the structure of the liquid discharge member of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the liquid discharge member of the present invention.

[0018] In the figure: 1, conversion plate; 2, liquid inlet; 3, transfer pipe interface 1; 4, transfer pipe interface 2; 5, valve control component; 501, ball valve 1; 502, fixing frame; 503, drive source 1; 504, sprocket 1; 505, sprocket 2; 506, chain; 507, branch pipe; 508, valve column; 509, compressed gas bottle; 6, drainage component; 601, ball valve 2; 602, mounting frame; 603, drive source 2 ; 604, sleeve; 605, limit rod; 606, return spring; 607, bypass pipe; 608, round head valve block; 7, adapter hose; 8, fixing piece; 9, connecting air pipe; 10, air pipe interface; 11, quick connector; 12, liquid outlet; 13, compressed air transmitting port; 14, compressed air receiving port; 15, integrated box; 16, solenoid valve assembly; 17, air pipe connecting pipe one; 18, air pipe connecting pipe two. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present invention provides a technical solution: a transfer pipe device, including several basic parts such as a valve island, a conversion disk 1, a transfer pipe interface 1 3, a transfer pipe interface 2 4, a liquid inlet 2, a liquid outlet 12 and a connecting air pipe 9, wherein the liquid inlet 2 and the liquid outlet 12 are provided with valves, the transfer pipe interface 1 3 and the transfer pipe interface 2 4 are respectively provided with a row installed on one side of the conversion disk 1, and the liquid inlet 2 and the liquid outlet 12 are respectively provided with a row installed on the other side of the conversion disk 1, each transfer pipe interface 1 3 is respectively connected to the corresponding liquid inlet 2, each transfer pipe interface 2 4 is respectively connected to the corresponding liquid outlet 12, the liquid inlet 2 is connected to the pipeline medicine liquid inlet, the liquid outlet 12 is connected to the pipeline medicine liquid outlet, and the transfer pipe interface 1 3 and the transfer pipe interface 2 4 are connected through a transfer hose 7.

[0021] For ease of understanding, Figure 2As shown, A1-A6 are turnover tanks, B1-B6 are concentrators, and to achieve liquid flow between any turnover tank and any concentrator, for example, to achieve liquid flow between A1 and B1, the transfer tube interface 1 3 corresponding to A1 and the transfer tube interface 2 4 corresponding to B1 can be connected through a transfer hose 7. For example, to achieve liquid flow between A1 and B2, the transfer tube interface 1 3 corresponding to A1 and the transfer tube interface 2 4 corresponding to B2 can be connected through a transfer hose 7. If it is necessary to achieve liquid flow between A3 and B3 and B4, the transfer tube interface 1 3 corresponding to A3 and the transfer tube interface 2 4 corresponding to B3 and B4 can be connected through a special three-way transfer hose 7.

[0022] Combination Figure 1 and Figure 3 , an air pipe interface 10 is installed on both sides of the conversion disk 1 corresponding to each transfer pipe interface 1 3, transfer pipe interface 2 4, liquid inlet 2 and liquid outlet 12. The air pipe interface 10 near the liquid inlet 2 is used to install an air pipe pipe 17, and the air pipe interface 10 near the liquid outlet 12 is used to install an air pipe pipe 2 18. A transfer pipe interface 1 3 and a transfer pipe interface 2 4 are connected through a transfer hose 7, and a connecting air pipe 9 is installed on the transfer hose 7 through a fixing member 8. Both ends of the connecting air pipe 9 are connected to the air pipe interfaces 10 near both ends of the transfer hose 7 through quick connectors 11, wherein the valve island includes an integrated box 15, and the integrated box 15 is provided with a solenoid valve assembly 16, and the solenoid valve assembly 16 is provided with a plurality of compressed air transmitting ports 13 and compressed air receiving ports 14, and the number of the compressed air transmitting ports 13 and the compressed air receiving ports 14 respectively corresponds to the number of the transfer pipe interface 1 3 and the transfer pipe interface 2 4; The solenoid valve assembly 16 is provided with a micro-pressure switch for receiving compressed air. Whether the pipeline is connected is determined by judging whether the micro-pressure switch receives compressed air. Each pipeline interface corresponds to a compressed air transmitting port 13 and a compressed air receiving port 14. The compressed air switch is controlled by the solenoid valve assembly 16. The compressed air pipe is fixed on the liquid medicine transfer pipeline. The compressed air quick connector 11 is connected to the corresponding interface of the liquid medicine pipeline. The pipeline connection mode can be identified by matching the compressed air emitted in a patrolling manner. That is to say, the device determines the interface connected to the conversion disk 1 by transmitting compressed air in a patrolling manner. Specifically, the valve island emits compressed air from the compressed air transmitting port 13, and each liquid inlet 2 is impacted by the compressed air. However, only the transfer pipe interface 1 3 connected to the transfer hose 7 and the transfer pipe interface 2 4 can continue to circulate compressed air through the connecting air pipe 9 until it passes through the air pipe pipe 2 18 and returns to the compressed air receiving port 14. The micro-pressure switch receives the refluxed compressed air and determines that the pipeline between the interfaces is flowing.

[0023] This method is also applicable to one-to-many takeover connections. For ease of understanding, Figure 2 , A3 is connected with B3 and B4, and can be connected through a three-way adapter hose 7. The three-way adapter hose 7 is connected to the three-way connecting air pipe 9 through a fixing piece 8 and is connected to the air pipe interface 10 near the corresponding two adapter pipe interfaces 2 4. By emitting compressed air, it can be determined whether A3 is connected with B3 and B4. The traditional method is to install a proximity switch at the position where the pipeline passes. There will be a signal after the pipeline is connected. It can only identify the fixed one-to-one connection position. In the one-to-many connection method, a special pipeline is required. The position of the proximity switch needs to be designed according to the position of the special pipeline. After completion, the position is fixed and cannot be changed. In addition, due to the limitation of the pipeline material, multiple pipelines are required for connection in a complex connection method. The traditional connection method is a hard pipe connection. In the case of multiple pipeline connections, such as A1 is connected with B2, A2 is connected with B1, the pipelines are easy to collide, and the installation of the proximity switch is also difficult. The use of a hose connection can avoid this situation. In addition, the present embodiment determines the pipeline connection through the air pipe, and the installation of the air pipe does not require a fixed installation position, which is more convenient and has higher controllability.

[0024] like Figure 4 As shown, what needs to be understood about this embodiment is that a valve control component 5 is provided at the transfer pipe interface 3, and the valve control component 5 includes a ball valve 501 provided between the transfer pipe interface 3 and the conversion disk 1, and the ball valve 501 controls the liquid in the pipeline by rotating the internal ball valve, and a fixing frame 502 is installed on the valve shell of the ball valve 501, and a driving source 503 controlled by numerical control or switch is installed on the fixing frame 502, and the output end of the driving source 503 is connected to the valve body of the ball valve 501, and a branch pipe 507 is also fixed on the transfer pipe interface 3, and a valve column 508 is rotatably installed in the branch pipe 507, and a compressed gas bottle 509 is installed on one side of the branch pipe 507. The compressed gas bottle 509 is installed on the branch pipe 507 by screwing or clamping, and a notch is opened on the surface of the valve column 508, and the notch allows the gas in the compressed gas bottle 509 to flow to the adapter tube interface 3. A sprocket 2 505 is rotatably installed on the top of the branch pipe 507, and the sprocket 2 505 is coaxially fixed with the valve column 508. A sprocket 1 504 is also fixedly installed on the output end of the driving source 1 503, and the sprocket 1 504 and the sprocket 2 505 are connected by a chain 506. That is to say, when the driving source 1 503 controls the ball valve 1 501 to stop the liquid flow, the compressed gas in the compressed gas bottle 509 will gush out, and the liquid in the adapter hose 7 will be discharged from the adapter hose 7.

[0025] like Figure 5 and Figure 6As shown, a drain member 6 is provided at the transfer pipe interface 24, and the drain member 6 includes a ball valve 2 601 provided between the transfer pipe interface 24 and the conversion disk 1, and a mounting frame 602 is installed on the valve housing of the ball valve 2 601, and a driving source 2 603 which is synchronously controlled with the driving source 1 503 or controlled by a manual switch is installed on the mounting frame 602. When the driving source 1 503 controls the ball valve 1 501, the driving source 2 603 also controls the ball valve 2 601. A sleeve 604 is fixed below the transfer pipe interface 24, and the bottom of the sleeve 604 is sealed. The sleeve 604 is connected to the transfer pipe interface 24. The connection is provided with a round-head valve block 608 for blocking the connection between the sleeve 604 and the connecting pipe interface 24. A limit rod 605 is fixed at the bottom of the round-head valve block 608. The bottom of the sleeve 604 is sealed. The limit rod 605 passes through the bottom of the sleeve 604 and the sleeve 604 is limited. A reset spring 606 is sleeved on the surface of the limit rod 605. The reset spring 606 is arranged in the sleeve 604. When the round-head valve block 608 leaves the connection between the sleeve 604 and the transfer pipe interface 24 under the action of external force, the reset spring 606 can always give the round-head valve block 608 a reset force; With the support of this structure, after the driving source 1503 at the transfer tube interface 13 controls the ball valve 1501 to close the flow of pipeline liquid, the transfer tube interface 24 also immediately controls the ball valve 2601 to close. At this time, the valves at the liquid inlet 2 and the liquid outlet 12 also need to be closed, and the compressed air in the compressed gas bottle 509 gushes out to push the residual liquid in the transfer hose 7 toward the ball valve 2601. As the air pressure in the transfer hose 7 increases, the round head valve block 608 at the transfer tube interface 24 moves into the sleeve 604, and the sleeve 604 is provided with a bypass pipe 607 near the transfer tube interface 24. The liquid in the transfer hose 7 can be discharged from the bypass pipe 607. The top of the round head valve block 608 is arranged in an arc shape to avoid liquid accumulation and retention. The bypass pipe 607 is connected to a closed recovery tank. Compared with the traditional open reflux tank, this method can be suitable for the recovery of corrosive liquids and has a better protection effect on operators.

[0026] For the above devices, we propose the following detection methods to apply to the above devices: Step 1: Set the connection path of adapter plate 1; Step 2: Install the adapter hose 7 and connect the air pipe 9; Step three: launch compressed air through the valve island to determine the connection status of the pipe. Launch compressed air from the compressed air launching port 13 in sequence through the solenoid valve assembly 16 of the valve island. Sensing the corresponding compressed air receiving port 14 on the solenoid valve assembly 16 through the micro-pressure switch determines whether there is compressed air reflux. The corresponding compressed air receiving port 14 senses the compressed air reflux through the micro-pressure switch and determines that the pipe is connected.

[0027] by Figure 2For example, every time the adapter plate 1 pipeline is re-docking, the adapter plate 1 compressed air transmitting port 13 is opened in sequence, such as transmitting A1 compressed air, and other compressed air is closed. If the B1 receiving port detects a signal, the A1-B1 pipeline is connected. After the compressed air is transmitted in turn, the connection status of all pipelines can be confirmed; When one-to-many pipelines are connected, such as A1 transporting liquid to B2 and B3 at the same time, the compressed air transmitting port 13 is opened in sequence to emit compressed air. When the compressed air is emitted to A1, the compressed air receiving ports 14 corresponding to B2 and B3 simultaneously have signals, indicating that the liquid pipeline is correctly connected.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A transfer pipe device, characterized in that: include: A valve island, a conversion plate (1), a transfer pipe interface 1 (3), a transfer pipe interface 2 (4), a liquid inlet (2), a liquid outlet (12), and a connecting air pipe (9); The transfer tube interface 1 (3) and the transfer tube interface 2 (4) are respectively arranged in a row and mounted on one side of the conversion disk (1), and the liquid inlet (2) and the liquid outlet (12) are respectively arranged in a row and mounted on the other side of the conversion disk (1); Air pipe interfaces (10) are installed on both sides of the conversion disk 1, corresponding to each of the transfer pipe interface 1 (3), the transfer pipe interface 2 (4), the liquid inlet (2) and the liquid outlet (12). The air pipe interface (10) near the liquid inlet (2) is used to install the air pipe pipe 1 (17), and the air pipe interface (10) near the liquid outlet (12) is used to install the air pipe pipe 2 (18). A transfer hose (7) is provided between the transfer pipe interface 1 (3) and the transfer pipe interface 2 (4), and the air pipe pipe 1 (17) and the air pipe pipe 2 (18) are both connected to the valve island. A connecting air pipe (9) is mounted on the transfer hose (7) via a fixing member (8), and both ends of the connecting air pipe (9) are connected to air pipe interfaces (10) near both ends of the transfer hose (7) via quick connectors (11).

2. A transfer pipe device according to claim 1, characterized in that: Each transfer tube interface 1 (3) is respectively connected to a corresponding liquid inlet (2), each transfer tube interface 2 (4) is respectively connected to a corresponding liquid outlet (12), the liquid inlet (2) is connected to a pipeline drug liquid inlet, and the liquid outlet (12) is connected to a pipeline drug liquid outlet.

3. The adapter pipe device according to claim 1, characterized in that: The valve island comprises an integrated box (15), on which a solenoid valve assembly (16) is arranged, and on which a plurality of compressed air transmitting ports (13) and compressed air receiving ports (14) are arranged, wherein the number of the compressed air transmitting ports (13) and the compressed air receiving ports (14) respectively corresponds to the number of the transfer pipe interface 1 (3) and the transfer pipe interface 2 (4).

4. The adapter pipe device according to claim 1, characterized in that: A valve control component (5) is provided at the transfer pipe interface 1 (3), and the valve control component (5) comprises a ball valve 1 (501) provided between the transfer pipe interface 1 (3) and the conversion disk (1), a fixing frame (502) is installed on the valve housing of the ball valve 1 (501), a driving source 1 (503) is installed on the fixing frame (502), and an output end of the driving source 1 (503) is connected to the valve body of the ball valve 1 (501).

5. The adapter pipe device according to claim 1, characterized in that: A branch pipe (507) is also fixed to the transfer pipe interface 1 (3), a valve column (508) is rotatably mounted in the branch pipe (507), a compressed gas bottle (509) is mounted on one side of the branch pipe (507), and a notch is provided on the surface of the valve column (508), through which the gas in the compressed gas bottle (509) flows into the transfer pipe interface 1 (3).

6. A transition pipe device according to claim 5, characterized in that: A second sprocket (505) is rotatably mounted on the top of the branch pipe (507), and the second sprocket (505) is coaxially fixed with the valve column (508). A first sprocket (504) is also fixedly mounted on the output end of the driving source (503), and the first sprocket (504) and the second sprocket (505) are connected via a chain (506).

7. The adapter pipe device according to claim 1, characterized in that: A liquid discharge member (6) is provided at the transfer pipe interface 2 (4), and the liquid discharge member (6) comprises a ball valve 2 (601) provided between the transfer pipe interface 2 (4) and the conversion disk (1), and a mounting frame (602) is installed on the valve housing of the ball valve 2 (601), and a driving source 2 (603) which is synchronously controlled with the driving source 1 (503) is installed on the mounting frame (602).

8. The adapter pipe device according to claim 1, characterized in that: A sleeve (604) is fixed below the second transfer pipe interface (4). The sleeve 604 is connected to the connection of the second transfer pipe interface (4). A round-headed valve block (608) is provided at the connection to block the connection between the sleeve (604) and the second transfer pipe interface (4). A limit rod (605) is fixed at the bottom of the round-headed valve block (608). The bottom of the sleeve (604) is sealed. The limit rod (605) passes through the bottom of the sleeve (604). A return spring (606) is sleeved on the surface of the limit rod (605). The return spring (606) is arranged in the sleeve (604). A bypass pipe (607) is provided on the sleeve (604) near the second transfer pipe interface (4).

9. A method for detecting a transfer pipe, using a transfer pipe device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Set the connection path of the adapter plate (1); Step 2: Install the adapter hose (7) and connect the air pipe (9); Step 3: Send compressed air through the valve island to determine the connection status of the pipe.

10. A method for detecting a transfer pipe according to claim 9, characterized in that: In the step 3, compressed air is emitted through the valve island to determine the connection status of the pipe, which includes the following steps: S1: Compressed air is emitted from the compressed air emission port (13) in sequence through the solenoid valve assembly (16) of the valve island; S2: The corresponding compressed air receiving port (14) on the electromagnetic valve assembly (16) is sensed by a micro-pressure switch to determine whether there is compressed air reflux. When the corresponding compressed air receiving port (14) senses compressed air reflux through the micro-pressure switch, it is determined that the pipe is connected.

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