An integrated control system for airtight detection and coding of finished automobile pipelines

Abstract

The present invention discloses an integrated control system for airtight detection and coding of finished automotive pipelines, belonging to the technical field of detection of finished automotive pipelines. The system of the present invention integrates an airtight detection unit, a coding unit, a control system, and a tooling station module into an integrated detection and coding device. The airtight detection unit includes an airtight detector, a pressure sensor, and a control valve, and uses the differential pressure method or the direct pressure method to detect the airtightness of the pipeline. The laser marking device of the coding unit imprints information on qualified products and marks unqualified products. The control system takes the programmable logic controller as the core to coordinate the collaborative work of each unit, and the touch screen realizes human-machine interaction. The tooling station module has a batch fixing device, a pop-up module, an induction switch, and a prompt module to achieve classification processing and intelligent prompting. This system improves production efficiency and quality, has the advantages of integration and intelligence, and provides an efficient and reliable solution for automotive pipeline production enterprises.

Description

Technical Field

[0001] The present invention relates to the technical field of finished product inspection of automotive pipelines, and particularly relates to an integrated control system for airtight inspection and coding of finished automotive pipelines. Background Art

[0002] Automotive pipelines are important components used to transport working media such as gases and liquids in various automotive systems. Their product types are diverse. For example, chassis fuel pipes for transporting fuel, and brake vacuum pipes related to the automotive braking system. Since they need to transport working media such as gases and liquids, in the production process, airtightness inspection needs to be carried out on each product, and after the inspection, information such as product model, production date, and batch number needs to be printed on the pipeline product.

[0003] In traditional production processes, airtight inspection and coding are carried out at different workstations, which results in many transfer links in the production process. The transfer of products between different workstations consumes a large amount of time, increases labor costs, and is prone to damaging the products during the transfer process, affecting product quality. For example, frequent handling may cause scratches or bumps on the pipeline surface, reducing the appearance quality and performance of the product.

[0004] Secondly, airtight inspection will detect unqualified products. In traditional operation methods, unqualified products and qualified products are manually sorted and processed. Moreover, there is no difference in appearance between unqualified products and qualified products, and it is easy to cause confusion inadvertently, resulting in unqualified products flowing into the normal process, increasing the defective rate of products and reducing product quality.

[0005] In addition, traditional equipment is relatively single in function and lacks intelligent control. For example, traditional airtight inspection equipment may not be able to automatically and accurately judge the airtightness of pipelines according to preset parameters, and it is also difficult for coding equipment to cooperate effectively with other production links. Summary of the Invention

[0006] The main purpose of the present invention is to provide an integrated control system for airtight inspection and coding of finished automotive pipelines, which can effectively solve the problems mentioned in the background art.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] An integrated control system for airtight inspection and coding of finished automotive pipelines, the system mainly consists of an airtight inspection unit, a coding unit, a control system, a tooling workstation module, and an integrated inspection and coding device. The airtight inspection unit, the coding unit, the control system, and the tooling workstation module are all integrated on the integrated inspection and coding device, where:

[0009] The airtight detection unit includes: an airtight detector; a pressure sensor for real-time monitoring of the pressure change inside the pipeline; a control valve for controlling the inflow and outflow of gas;

[0010] The coding unit includes a laser marking device for marking and engraving qualified products; and marking obvious unqualified marks on unqualified products;

[0011] The control system includes: a programmable logic controller: the core control unit to achieve automatic control of the entire system and coordinate the collaborative operation of airtight detection and coding; a touch screen: the human-machine interaction interface for convenient parameter setting and monitoring by operators; sensors, including position sensors, photoelectric sensors, etc., to detect the position of pipeline products on the tooling station module;

[0012] The tooling station module includes: a batch fixing device capable of fixing a batch of pipelines simultaneously; a pop-up module that successively pops out unqualified products and qualified products according to the instructions of the control system; an induction switch provided at each specific station for detecting whether the unqualified products have been taken out; a prompt module that gives a signal when all unqualified products have been taken out, and the tooling station module gives a light or sound prompt.

[0013] Preferably, in the airtight detection unit, the airtight detector uses the differential pressure method or the direct pressure method to detect the airtightness of the pipeline. The differential pressure method determines the airtightness by comparing the pressure difference between the pipeline to be measured and the standard reference chamber. The pipeline to be measured and the standard reference chamber are simultaneously filled with gas at a certain pressure, and then the gas supply is isolated, and the change in the pressure difference is observed. If the pressure difference remains within the allowable range within the specified time, the pipeline is considered to have good airtightness; otherwise, it is considered that the pipeline has leaks. The direct pressure method directly fills the pipeline to be measured with gas at a certain pressure, and then monitors the change in the pressure inside the pipeline. If the pressure does not drop by more than the allowable value within the specified time, the pipeline is considered to have good airtightness; otherwise, it is considered that the pipeline has leaks. The judgment criterion for airtight detection is expressed as:

[0014] Leakage rate = (Initial pressure - Final pressure) / Test time / Pipeline volume

[0015] If the leakage rate is less than the set allowable leakage rate, the pipeline is considered to have qualified airtightness; otherwise, the pipeline is considered unqualified; and the pressure sensor real-time monitors the pressure change inside the pipeline and converts the pressure signal into an electrical signal and transmits it to the control system; the control valve opens or closes the gas passage according to the instructions of the control system to adjust the pressure inside the pipeline.

[0016] Preferably, upon receiving the qualified signal from the airtight detection unit, the control system sends an instruction to the laser marking device to initiate the coding operation on the qualified products according to the preset product information, such as product model, production date, batch number, etc. When the airtight detection unit detects unqualified products, it transmits the unqualified signal to the control system. The control system then sends an instruction to the laser marking device, which marks the surface of the unqualified products with a prominent unqualified mark according to the preset unqualified identification pattern, such as the word "unqualified" or a specific marking symbol.

[0017] Preferably, the programmable logic controller in the control system is programmed according to the system requirements. The programmable logic controller program enables the programmable logic controller to communicate with the airtight detection unit, the coding unit, and the equipment at the tooling station, sending control instructions and receiving feedback signals. In this way, the automatic control of the entire system is achieved.

[0018] Preferably, the touch screen serves as a human-machine interface, providing an intuitive and convenient way for operators to set parameters and monitor the system operation status. Operators can set the parameters of airtight detection (such as pressure range, detection time, etc.), the content of coding (such as product information, unqualified marks, etc.) through the touch screen, and view the operation data and alarm information of the system. The touch screen is connected to the programmable logic controller through a communication interface to achieve data exchange. The parameters set by the operator on the touch screen can be transmitted to the programmable logic controller, and the operation data and status information in the programmable logic controller can also be displayed on the touch screen.

[0019] Preferably, the position sensor is used to detect the position of the pipeline product at the tooling station. The position sensor usually adopts forms such as proximity switches and photoelectric switches. When the pipeline product reaches a specific position, the position sensor emits a signal. After receiving this signal, the programmable logic controller performs corresponding control operations to ensure that the product is in the correct position during the detection and coding processes. The photoelectric sensor is used to detect the presence or absence of the pipeline product. The photoelectric sensor detects the presence of an object by emitting and receiving light. When the light is blocked by an object, the photoelectric sensor emits a signal to trigger the start and stop of the system.

[0020] Preferably, the batch fixing device adopts the form of pneumatic clamps, which can accommodate and fix a batch of pipelines simultaneously, providing a stable working platform for subsequent airtight detection and coding operations. Considering different types of pipeline products, the batch fixing device has corresponding different sets.

[0021] Preferably, the ejection module belongs to an accessory structure of the batch fixing device and ejects the unqualified and qualified products on the batch fixing device according to the instruction of the control system by means of pneumatic transmission.

[0022] Preferably, the induction switch adopts an optoelectronic sensor to detect whether the defective products have been taken out completely; when the worker takes away the defective products, the induction switch can detect the position change of the pipeline and transmit this signal to the programmable logic controller.

[0023] Preferably, after receiving the instruction that the defective products have been taken out completely sent by the programmable logic controller, the prompting module sends a signal to the worker in the form of light flashing or sound alarm to inform that all the defective products have been taken out completely and the worker can perform the operation of taking out the qualified products.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Integrated design: Integrating the airtightness detection and coding functions on one station realizes integrated operation, reduces the transfer links in the production process, and improves the production efficiency.

[0026] 2. Intelligent control: Using a programmable logic controller for automatic control, it can accurately judge the airtightness of the pipeline according to the preset parameters and coordinate the collaborative progress of the airtightness detection and coding work, improving the intelligent level of the system.

[0027] 3. Classification processing and intelligent prompting: Through the pop-up module, induction switch and prompting module of the tooling station, the classification pop-up and taking out of defective products and qualified products are realized, and the induction switch is used to detect whether the defective products have been taken out completely, and a light or sound prompt is sent through the prompting module to ensure that the worker can take out the pipeline in time and avoid omission. At the same time, the pop-up module controls the pop-up sequence of defective products and qualified products through the program, realizing accurate classification processing. Brief Description of the Drawings

[0028] Figure 1 is a schematic diagram of the system composition structure of the present invention;

[0029] Figure 2 is a schematic diagram of the working process of the present invention. Detailed Embodiment

[0030] To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with the detailed embodiment.

[0031] As Figure 1-2 shown, an integrated control system for airtightness detection and coding of finished automobile pipelines mainly consists of an airtightness detection unit, a coding unit, a control system, a tooling station module and an integrated detection and coding device. These units and modules are all integrated on the integrated detection and coding device, realizing an efficient and intelligent detection and coding process for finished automobile pipelines.

[0032] I. System Composition

[0033] Airtight Detection Unit:

[0034] Airtight Detector: It uses the differential pressure method or the direct pressure method to detect the airtightness of pipelines. For example, for some automotive brake vacuum tubes with high airtightness requirements, the differential pressure method can be preferentially used for detection. The differential pressure method determines airtightness by comparing the pressure difference between the pipeline under test and a standard reference chamber. The pipeline under test and the standard reference chamber are simultaneously filled with gas at a certain pressure, such as nitrogen at 5 atmospheres. Then, the gas supply is isolated, and the change in the pressure difference is observed. If the pressure difference remains within the allowable range, such as not exceeding 0.1 atmosphere, within a specified time, such as 30 seconds, the pipeline is considered to have good airtightness; otherwise, it is considered that there is a leak in the pipeline.

[0035] Pressure Sensor: It monitors the internal pressure change of the pipeline in real time. The pressure sensor converts the pressure signal into an electrical signal and transmits it to the control system. For example, when detecting the fuel pipeline of an automotive chassis, the pressure sensor can accurately detect the internal pressure change of the fuel pipeline, with an accuracy of up to 0.01 atmosphere. This can ensure a more accurate judgment of airtightness.

[0036] Control Valve: According to the instructions of the control system, it opens or closes the gas passage to adjust the internal pressure of the pipeline. For example, when performing direct pressure method detection, the control valve directly fills the pipeline under test with gas at a certain pressure, such as compressed air at 4 atmospheres. If the pressure drop does not exceed the allowable value, such as 0.05 atmosphere, within a specified time, such as 20 seconds, the pipeline is considered to have good airtightness; otherwise, it is considered that there is a leak in the pipeline.

[0037] Coding Unit:

[0038] Laser Marking Equipment: It marks and engraves qualified products, including product information such as product model, production date, batch number, etc. For example, for the battery pack cooling tube of a new energy vehicle, the laser marking equipment can clearly engrave the product model "NEV-CoolingTube-01", production date "20240820", and batch number "Batch-001" on the surface of the cooling tube. It marks unqualified products with prominent unqualified marks, such as the words "unqualified" or specific marking symbols. For example, a red "X" mark can be engraved for subsequent differentiation and processing.

[0039] Control System:

[0040] Programmable Logic Controller (PLC): As the core control unit, it realizes the automatic control of the entire system and coordinates the cooperation of airtight detection and coding operations. The programmable logic controller writes programs according to the system requirements, communicates with the equipment in the airtight detection unit, coding unit, and tooling station, sends control instructions, and receives feedback signals. For example, when the programmable logic controller receives the signal detected by the photoelectric sensor that the pipeline product enters the tooling station, it immediately starts the airtight detection unit for airtightness detection. If the detection result is qualified, the programmable logic controller controls the coding unit to code the product; if the detection result is unqualified, the programmable logic controller controls the ejection module to eject the unqualified product.

[0041] Touch screen: As the human-machine interface, it facilitates operators to set parameters and monitor the operation status of the system. Operators can set the parameters of airtight detection (such as pressure range, detection time, etc.), the content of coding (such as product information, unqualified identification, etc.) through the touch screen, and view the operation data and alarm information of the system. For example, operators can set the pressure range of airtight detection to 3 - 5 atmospheres and the detection time to 25 seconds on the touch screen. At the same time, the touch screen is connected to the programmable logic controller through a communication interface to achieve data exchange. The parameters set by the operator on the touch screen can be transmitted to the programmable logic controller, and the operation data and status information in the programmable logic controller can also be displayed on the touch screen.

[0042] Sensors: Include position sensors and photoelectric sensors, etc., to detect the position of the pipeline product on the tooling station module. Position sensors usually adopt forms such as proximity switches and photoelectric switches. When the pipeline product reaches a specific position, the position sensor emits a signal. After receiving this signal, the programmable logic controller performs corresponding control operations to ensure that the product is in the correct position during detection and coding. For example, when the automotive skylight drain pipe enters the tooling station, the position sensor detects that the drain pipe reaches the specified position and sends a signal to the programmable logic controller. The programmable logic controller controls the batch fixing device to fix the drain pipe for subsequent airtight detection and coding operations. The photoelectric sensor is used to detect the presence or absence of the pipeline product, and detects the presence of an object by emitting and receiving light. When the light is blocked by an object, the photoelectric sensor emits a signal to trigger the start and stop of the system. For example, when a new pipeline product enters the tooling station, the photoelectric sensor detects the presence of the product and sends a signal to the programmable logic controller to start the system for airtight detection and coding operations.

[0043] Tooling station module:

[0044] Batch fixing device: In the form of a pneumatic fixture, it can accommodate and fix a batch of pipelines simultaneously, providing a stable working platform for subsequent airtight detection and coding operations. Considering different types of pipeline products, the batch fixing device accordingly has different sets. For example, for the relatively small-diameter battery pack cooling pipes, a specially designed pneumatic fixture can be used to fix 10 cooling pipes simultaneously. For the relatively large-diameter chassis fuel pipes, another set of pneumatic fixtures is used to fix 5 fuel pipes simultaneously.

[0045] Ejection module: It belongs to an accessory structure of the batch fixing device. According to the instructions of the control system, it ejects unqualified products and qualified products on the batch fixing device in a pneumatic transmission manner. For example, when the programmable logic controller determines that a certain pipeline is an unqualified product, it controls the ejection module to eject the unqualified product from the batch fixing device so that workers can perform subsequent processing.

[0046] Inductive switch: An optoelectronic sensor is used to detect whether the unqualified products have been taken out completely. When workers take away the unqualified products, the inductive switch can detect the position change of the pipelines and transmit this signal to the programmable logic controller. For example, after workers take away the unqualified products, the inductive switch detects the position change of the pipelines and sends a signal to the programmable logic controller, and the programmable logic controller records that the unqualified products have been taken away.

[0047] Prompt module: After receiving the instruction from the programmable logic controller that all unqualified products have been taken out, it uses the way of flashing lights or sound alarms to send signals to workers, informing that all unqualified products have been taken out completely and the qualified products can be taken out. For example, when all unqualified products have been taken away, the indicator light of the prompt module starts to flash, and at the same time, it emits a "beep" sound to remind workers that they can take out the qualified products.

[0048] II. System implementation process

[0049] The product enters the detection stage:

[0050] When the optoelectronic sensor detects that the pipeline product enters the tooling station, the optoelectronic sensor sends a high-level signal to the programmable logic controller. For example, when an automotive pipeline product is placed on the tooling station, the optoelectronic sensor detects the presence of the product and immediately sends a signal to the programmable logic controller.

[0051] After receiving this signal, the programmable logic controller starts the airtight detection unit to conduct airtight detection on the product. At this time, the programmable logic controller sends a start signal to the airtight detection unit, such as opening the control valve to fill the pipeline with detection gas. For example, the programmable logic controller controls the control valve to open and fills the pipeline under test with compressed air at 4 atmospheric pressures to start the airtight detection.

[0052] Airtight detection stage:

[0053] The pressure sensor continuously monitors the internal pressure change of the pipeline and transmits the pressure value to the programmable logic controller in the form of an analog signal. For example, during the airtight detection process, the pressure sensor constantly detects the internal pressure change of the pipeline and transmits the pressure value to the programmable logic controller in the form of an analog signal. The programmable logic controller performs analog-to-digital conversion on the analog signal of the pressure sensor to obtain the pressure value in digital form.

[0054] The programmable logic controller compares the real-time pressure value with the preset qualified pressure range. If the pressure value is within the qualified range and remains stable within a certain period of time (for example, the pressure change does not exceed a certain value within the set detection time), it is determined that the product has qualified airtightness; otherwise, it is determined that the product is unqualified. For example, the preset qualified pressure range is 3.5 - 4.5 atmospheres. If the pressure value is always within this range and the pressure change does not exceed 0.05 atmospheres within the detection time, it is determined that the product has qualified airtightness; otherwise, it is determined that the product is unqualified.

[0055] Coding or unqualified product handling stage:

[0056] If the product is determined to be qualified:

[0057] The programmable logic controller controls the coding unit to code the product. Send a start signal to the coding unit and transmit the product information to be coded, such as product model, production date, etc. For example, for a qualified automotive pipeline, the programmable logic controller controls the laser marking device to engrave the product model "CAR-Tube-001", production date "20240820", and batch number "Batch-002" on the pipeline surface.

[0058] After coding is completed, the programmable logic controller waits for the next operation instruction.

[0059] If the product is determined to be unqualified:

[0060] The programmable logic controller controls the ejection module at the tooling station to eject the unqualified product. Send an action signal to the ejection module to separate the unqualified product from the batch fixing device. For example, when the programmable logic controller determines that a certain pipeline is unqualified, it controls the ejection module to eject the unqualified product from the batch fixing device for subsequent processing by workers.

[0061] After the defective products are ejected, the programmable logic controller waits for the worker to take away the defective products. When the inductive switch detects that all the defective products have been taken away, it sends a signal to the programmable logic controller. For example, when the worker takes away the defective products, the inductive switch detects the position change of the pipeline and sends a signal to the programmable logic controller, informing the programmable logic controller that the defective products have been taken away.

[0062] Qualified product extraction stage:

[0063] When all the defective products have been taken away, the inductive switch sends a signal to the programmable logic controller, indicating that all the defective products have been processed.

[0064] After receiving this signal, the programmable logic controller controls the ejection module to eject the qualified products. It sends an action signal to the ejection module to separate the qualified products from the batch fixing device. For example, when all the defective products have been taken away, the programmable logic controller controls the ejection module to eject the qualified automotive pipelines from the batch fixing device for the worker to package and store.

[0065] After the qualified products are ejected, the programmable logic controller waits for the worker to take away the qualified products. When the inductive switch detects that all the pipeline products have been taken away, it sends a signal to the programmable logic controller. For example, when the worker takes away the qualified products, the inductive switch detects the position change of the pipeline and sends a signal to the programmable logic controller, informing the programmable logic controller that all the products have been taken away.

[0066] System reset stage:

[0067] When the inductive switch detects that all the pipeline products have been taken away, it sends a signal to the programmable logic controller.

[0068] After receiving this signal, the programmable logic controller controls the tooling station to perform a reset operation, preparing to receive the next batch of pipeline products. For example, the programmable logic controller controls the batch fixing device to loosen and the ejection module to reset, getting ready for the detection and coding of the next batch of pipeline products.

[0069] Meanwhile, the programmable logic controller can also perform some initialization operations on the airtight detection unit and the coding unit, such as closing the control valve and clearing the cache of the coding unit. For example, the programmable logic controller controls the control valve to close, stops filling the pipeline with detection gas, and clears the cache of the laser marking device, getting ready for the next coding operation.

[0070] This integrated control system for airtight detection and coding of automotive pipeline finished products improves production efficiency and quality through innovative points such as integrated design, intelligent control, classification processing, and intelligent prompting, and has the following advantages:

[0071] The integrated design integrates the airtight detection and coding functions on one workstation, reducing the transfer links in the production process, improving the production efficiency, and avoiding damage to the products during the transfer process.

[0072] The intelligent control uses a programmable logic controller (PLC) for automatic control. It can accurately judge the airtightness of the pipeline according to the preset parameters, and coordinate the simultaneous operation of airtight detection and coding work, improving the intelligent level of the system and avoiding manual misjudgment.

[0073] The classification processing and intelligent prompt are realized through the pop-up module, induction switch and prompt module of the tooling workstation, achieving the classification pop-up and removal of unqualified products and qualified products. The induction switch is used to detect whether all unqualified products have been taken out, and the prompt module issues a light or sound prompt to ensure that the workers can take out the pipeline in time, avoid omission, and achieve accurate classification processing.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An integrated control system for airtight detection and coding of finished automobile pipelines, characterized in that: The system mainly consists of an airtight detection unit, a coding unit, a control system, a tooling station module, and an integrated detection and coding device. The airtight detection unit, coding unit, control system, and tooling station module are all integrated on the integrated detection and coding device, where: The airtight detection unit includes: an airtight detector; a pressure sensor for real-time monitoring of the pressure change inside the pipeline; a control valve for controlling the inlet and outlet of gas. In the airtight detection unit, the airtight detector uses the differential pressure method or the direct pressure method to detect the airtightness of the pipeline. The judgment criterion for airtight detection is expressed as: Leakage rate = (Initial pressure - Final pressure) / Test time / Pipeline volume If the leakage rate is less than the set allowable leakage rate, the pipeline airtightness is considered qualified; otherwise, the pipeline is considered unqualified. The pressure sensor continuously monitors the pressure change inside the pipeline and converts the pressure signal into an electrical signal for transmission to the control system. The control valve opens or closes the gas passage according to the instructions of the control system to adjust the pressure inside the pipeline. The coding unit includes a laser marking device for marking and engraving qualified products; and marking obvious unqualified marks on unqualified products. The control system includes: a programmable logic controller: the core control unit that realizes the automatic control of the entire system and coordinates the collaborative operation of airtight detection and coding; a touch screen: a human-machine interface that facilitates operators to set parameters and monitor; sensors, including position sensors and photoelectric sensors, etc., to detect the position of pipeline products on the tooling station module. When the control system receives the qualified signal from the airtight detection unit, it sends instructions to the laser marking device and starts the coding operation for qualified products according to the preset product information. When the airtight detection unit detects an unqualified product, it transmits the unqualified signal to the control system, and the control system sends instructions to the laser marking device to mark obvious unqualified marks on the unqualified product. The tooling station module includes: a batch fixing device that can fix a batch of pipelines simultaneously; a pop-up module that ejects unqualified products and qualified products successively according to the instructions of the control system; an induction switch, with an induction switch set at each specific station to detect whether the unqualified products have been taken out; a prompt module that gives a signal when all unqualified products have been taken out, and the tooling station module emits a light or sound prompt.

2. An integrated control system for airtight detection and coding of finished automotive pipelines according to claim 1, characterized in that: In the control system, the programmable logic controller writes a programmable logic controller program according to the system requirements. At the same time, the programmable logic controller communicates with the devices of the airtight detection unit, coding unit, and tooling station, sends control instructions, and receives feedback signals. In this way, the automatic control of the entire system is realized.

3. An integrated control system for airtight detection and coding of finished automotive pipelines according to claim 2, characterized in that: The touch screen is connected to the programmable logic controller through a communication interface to achieve data exchange. The parameters set by the operator on the touch screen can be transmitted to the programmable logic controller, and the running data and status information in the programmable logic controller can also be displayed on the touch screen.

4. An integrated control system for airtight detection and coding of finished automobile pipelines according to claim 3, characterized in that: The position sensor is used to detect the position of the pipeline product on the tooling station to ensure that the product is in the correct position during the detection and coding processes; the photoelectric sensor is used to detect the presence or absence of the pipeline product to trigger the start and stop of the system.

5. An integrated control system for airtight detection and coding of finished automotive pipelines according to claim 1, characterized in that: The batch fixing device is in the form of a pneumatic fixture and can accommodate and fix a batch of pipelines simultaneously, providing a stable working platform for subsequent airtight detection and coding operations.

6. An integrated control system for airtight detection and coding of finished automobile pipelines according to claim 5, characterized in that: The ejection module belongs to an accessory structure of the batch fixing device and ejects the unqualified and qualified products on the batch fixing device by means of pneumatic transmission.

7. An integrated control system for airtight detection and coding of finished automobile pipelines according to claim 6, characterized in that: The induction switch uses a photoelectric sensor to detect whether the unqualified products have been completely taken away; when the worker takes away the unqualified products, the induction switch can detect the position change of the pipeline and transmit this signal to the programmable logic controller.

8. An integrated control system for airtight detection and coding of finished automotive pipelines according to claim 7, characterized in that: After receiving the instruction from the programmable logic controller that all unqualified products have been taken away, the prompt module emits a signal to the worker in the form of flashing lights or sound alarms to inform that all unqualified products have been taken away and the worker can perform the operation of taking out the qualified products.

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