Automobile pipeline finished product airtightness detection and code printing integrated control system

Abstract

The invention discloses an automobile pipeline finished product airtightness detection and code printing integrated control system, belongs to the technical field of automobile pipeline finished product detection, and integrates an airtightness detection unit, a code printing unit, a control system and a tool station module into integrated detection code printing equipment. The air tightness detection unit comprises an air tightness detector, a pressure sensor and a control valve, and adopts a differential pressure method or a direct pressure method to detect the air tightness of the pipeline. And laser marking equipment of the code printing unit is used for engraving information on qualified products and marking unqualified products. The control system takes a programmable logic controller as a core, all units are coordinated to work cooperatively, and man-machine interaction is achieved through a touch screen. The tool station module is provided with a batch fixing device, a pop-up module, an inductive switch and a prompting module, and classified processing and intelligent prompting are achieved. The system improves the production efficiency and quality, has the advantages of integration and intellectualization, and provides an efficient and reliable solution for automobile pipeline production enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of automobile pipeline finished product detection, and in particular to an integrated control system for automobile pipeline finished product airtightness detection and coding. Background Art

[0002] Automobile pipelines are important parts used to transport working media such as gas and liquid in various systems of automobiles. There are various types of products, such as chassis fuel pipes used to transport fuel, brake vacuum pipes related to automobile braking systems, etc. Since they need to transport working media such as gas and liquid, each product needs to be tested for air tightness during the production process, and after the test, the product model, production date, batch and other information are printed on the pipeline products.

[0003] In the traditional production process, airtightness testing and coding are carried out at different stations, which leads to many transfer links in the production process. The transfer of products between different stations takes a lot of time, increases labor costs, and is prone to damage to products during the transfer process, affecting product quality. For example, frequent handling may cause scratches or bumps on the surface of the pipeline, reducing the appearance quality and performance of the product.

[0004] Secondly, airtightness testing will detect defective products. The traditional operation method is to manually classify and process defective and qualified products. There is no difference in appearance between defective and qualified products. If you are not careful, it may cause confusion and allow defective products to flow into the normal process, resulting in an increase in the defective rate of products and reduced product quality.

[0005] In addition, traditional equipment is relatively simple in function and lacks intelligent control. For example, traditional airtightness detection equipment may not be able to automatically and accurately determine the airtightness of the pipeline according to preset parameters, and coding equipment is difficult to work 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 air tightness detection and coding of finished automobile pipelines, which can effectively solve the problems mentioned in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: An integrated control system for airtightness detection and coding of finished automobile pipelines, the system mainly consists of an airtightness detection unit, a coding unit, a control system, a tooling station module and an integrated detection and coding device, wherein the airtightness detection unit, the coding unit, the control system and the tooling station module are all integrated on the integrated detection and coding device, wherein: The airtightness detection unit includes: an airtightness detector; a pressure sensor to monitor the pressure change inside the pipeline in real time; and a control valve to control the inlet and outlet of gas; The coding unit includes a laser marking device, which is used to mark qualified products and mark unqualified products with a conspicuous unqualified mark; The control system includes: a programmable logic controller: a core control unit to realize the automatic control of the entire system and coordinate the coordinated progress of airtightness detection and coding; a touch screen: a human-machine interaction interface to facilitate 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; The tooling station module includes: a batch fixing device that can fix a batch of pipelines at the same time; an ejection module that ejects unqualified products and qualified products in turn according to the instructions of the control system; an induction switch, an induction switch is set on each specific station to detect whether the unqualified products have been taken out; a prompt module, when all unqualified products have been taken out, the induction switch gives a signal, and the tooling station module emits a light or sound prompt.

[0008] Preferably, the air tightness detector in the air tightness detection unit adopts a differential pressure method or a direct pressure method to detect the air tightness of the pipeline. The differential pressure method judges the air tightness by comparing the pressure difference between the tested pipeline and the standard reference cavity. The tested pipeline and the standard reference cavity are simultaneously filled with a gas of a certain pressure, and then the gas supply is isolated to observe the change in the pressure difference. If the pressure difference remains within the allowable range within the specified time, the pipeline is considered to have good air tightness; otherwise, it is considered that there is a leak in the pipeline. The direct pressure method is to directly fill the tested pipeline with a gas of a certain pressure, and then monitor the change in pressure in the pipeline. If the pressure drops by no more than the allowable value within the specified time, the pipeline is considered to have good air tightness; otherwise, it is considered that there is a leak in the pipeline. The judgment criteria for air tightness detection are expressed as: Leak rate = (initial pressure - final pressure) / test time / pipeline volume If the leakage rate is less than the set allowable leakage rate, the pipeline is considered to be airtight; otherwise, the pipeline is considered to be unqualified; the pressure sensor monitors the pressure changes inside the pipeline in real time, and converts the pressure signal into an electrical signal and transmits it to the control system; the control valve opens or closes the gas channel according to the instructions of the control system to adjust the pressure inside the pipeline.

[0009] Preferably, the control system receives a qualified signal from the airtight detection unit, sends a command to the laser marking device, and starts the coding operation for the qualified products according to preset product information, such as product model, production date, batch, etc.; when the airtight detection unit detects an unqualified product, the unqualified signal is transmitted to the control system, and the control system sends a command to the laser marking device. The laser marking device marks the surface of the unqualified product according to a preset unqualified identification pattern, such as the word "unqualified" or a specific marking symbol, and puts a conspicuous unqualified mark on the unqualified product.

[0010] Preferably, the programmable logic controller in the control system is written according to the requirements of the system, and the programmable logic controller program is simultaneously communicated with the airtight detection unit, the coding unit and the equipment of the tooling station, sending control instructions and receiving feedback signals, and in this way, automatic control of the entire system is achieved.

[0011] Preferably, the touch screen, as a human-machine interaction interface, provides an intuitive and convenient way for operators to set parameters and monitor the operating status of the system. Operators can set airtightness detection parameters (such as pressure range, detection time, etc.), coding content (such as product information, unqualified identification, etc.) and view system operation data and alarm information through the touch screen. 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 operating data and status information in the programmable logic controller can also be displayed on the touch screen.

[0012] Preferably, the position sensor is used to detect the position of the pipeline product on the tooling station. The position sensor is usually in the form of a proximity switch, a photoelectric switch, etc. When the pipeline product reaches a specific position, the position sensor sends a signal. After receiving the signal, the programmable logic controller performs corresponding control operations to ensure that the product is in the correct position during the detection and coding process; the photoelectric sensor is used to detect the presence 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 sends a signal to trigger the start and stop of the system.

[0013] Preferably, the batch fixing device is in the form of a pneumatic clamp, which can accommodate and fix a batch of pipelines at the same time, providing a stable working platform for subsequent airtightness detection and coding operations. Considering the different types of pipeline products, the batch fixing devices are also divided into different sets accordingly.

[0014] Preferably, the ejection module is an auxiliary structure of the batch fixture, and according to the instruction of the control system, the unqualified products and qualified products on the batch fixture are ejected by pneumatic transmission.

[0015] Preferably, the induction switch uses a photoelectric sensor to detect whether the defective products have been taken away; when the worker takes away the defective products, the induction switch can detect the position change of the pipeline and transmit the signal to the programmable logic controller.

[0016] Preferably, after receiving the instruction from the programmable logic controller to take out all the defective products, the prompt module sends a signal to the worker by means of flashing lights or sound alarms, informing the worker that all the defective products have been taken out and that the qualified products can be taken out.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Integrated design: The airtightness detection and coding functions are integrated into one station, realizing integrated operation, reducing the transfer links in the production process and improving production efficiency.

[0018] Intelligent control: The programmable logic controller is used for automatic control, which can accurately judge the air tightness of the pipeline according to the preset parameters, and coordinate the joint work of air tightness detection and coding, thus improving the intelligence level of the system.

[0019] Classification and intelligent prompts: Through the pop-up module, sensor switch and prompt module of the tooling station, the classified pop-up and removal of unqualified and qualified products are realized, and the sensor switch is used to detect whether the unqualified products have been taken out. The prompt module sends out light or sound prompts to ensure that the workers take out the pipeline in time to avoid omissions. At the same time, the pop-up module controls the pop-up order of unqualified and qualified products through the program, realizing accurate classification and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the system composition architecture of the present invention; Figure 2 It is a schematic diagram of the workflow of the present invention. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figure 1-2 As shown in the figure, an integrated control system for air tightness detection and coding of finished automobile pipelines is mainly composed of an air tightness detection unit, a coding unit, a control system, a tooling station module, and an integrated detection and coding device. These units and modules are integrated on the integrated detection and coding device, realizing an efficient and intelligent automobile pipeline finished product detection and coding process.

[0023] 1. System composition Airtightness detection unit: Air tightness detector: Use differential pressure method or direct pressure method to detect the air tightness of the pipeline. For example, for some automotive brake vacuum tubes with high air tightness requirements, differential pressure method can be used for testing first. The differential pressure method judges the air tightness by comparing the pressure difference between the tested pipeline and the standard reference cavity. The tested pipeline and the standard reference cavity are simultaneously filled with gas of a certain pressure, such as nitrogen at 5 atmospheres. Then isolate the gas supply and observe the change in pressure difference. If the pressure difference remains within the allowable range within a specified time, such as 30 seconds, for example, not exceeding 0.1 atmosphere, the pipeline is considered to be airtight; otherwise, the pipeline is considered to have a leak.

[0024] Pressure sensor: monitors the pressure changes inside 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 testing the fuel pipe of the chassis of an automobile, the pressure sensor can accurately detect the pressure changes inside the fuel pipe with an accuracy of up to 0.01 atmospheres. This ensures a more accurate judgment of air tightness.

[0025] Control valve: Open or close the gas channel according to the command of the control system to adjust the pressure inside the pipeline. For example, when performing direct pressure testing, the control valve directly fills the pipeline under test with gas of a certain pressure, such as compressed air at 4 atmospheres. If the pressure drop does not exceed the allowable value, such as 0.05 atmospheres, within a specified time, such as 20 seconds, the pipeline is considered to be airtight; otherwise, it is considered that there is a leak in the pipeline.

[0026] Coding unit: Laser marking equipment: Mark qualified products with product information such as product model, production date, batch, etc. For example, for a 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. Mark unqualified products with a conspicuous unqualified mark, such as the word "unqualified" or a specific mark symbol. For example, a red "X" mark can be engraved to facilitate subsequent distinction and processing.

[0027] Control system: Programmable Logic Controller (PLC): As the core control unit, it realizes the automatic control of the entire system and coordinates the coordinated progress of airtight detection and coding. The PLC writes programs according to the system requirements, communicates with the airtight detection unit, coding unit and equipment at the tooling station, sends control instructions and receives feedback signals. For example, when the PLC receives a signal from the photoelectric sensor that the pipeline product enters the tooling station, it immediately starts the airtight detection unit for airtightness detection. If the test result is qualified, the PLC controls the coding unit to code the product; if the test result is unqualified, the PLC controls the pop-up module to eject the unqualified product.

[0028] Touch screen: As a human-machine interaction interface, it is convenient for operators to set parameters and monitor the operating status of the system. Operators can use the touch screen to set the parameters of airtight detection (such as pressure range, detection time, etc.), the content of coding (such as product information, unqualified identification, etc.), and view the operating data and alarm information of the system. For example, the operator 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 the communication interface to realize data exchange. The parameters set by the operator on the touch screen can be transmitted to the programmable logic controller, and the operating data and status information in the programmable logic controller can also be displayed on the touch screen.

[0029] Sensors: including position sensors and photoelectric sensors, etc., which detect the position of pipeline products on the tooling station module. Position sensors are usually in the form of proximity switches, photoelectric switches, etc. When the pipeline product reaches a specific position, the position sensor sends a signal, and the programmable logic controller receives this signal and performs corresponding control operations to ensure that the product is in the correct position during the detection and coding process. For example, when the car sunroof drain pipe enters the tooling station, the position sensor detects that the drain pipe has reached the specified position and sends a signal to the programmable logic controller. The programmable logic controller controls the batch fixture to fix the drain pipe for subsequent airtightness detection and coding operations. Photoelectric sensors are used to detect the presence or absence of pipeline products, and detect the presence of objects by emitting and receiving light. When the light is blocked by an object, the photoelectric sensor sends 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, sends a signal to the programmable logic controller, and starts the system for airtightness detection and coding operations.

[0030] Tooling station module: Batch fixture: It adopts the form of pneumatic clamps, which can accommodate and fix a batch of pipes at the same time, providing a stable working platform for subsequent airtightness testing and coding operations. Considering the different types of pipeline products, the batch fixtures are also divided into different sets. For example, for battery pack cooling pipes with smaller diameters, a specially designed set of pneumatic clamps can be used to fix 10 cooling pipes at the same time. For chassis fuel pipes with larger diameters, another set of pneumatic clamps is used to fix 5 fuel pipes at the same time.

[0031] Ejection module: It is an auxiliary structure of the batch fixture. According to the instructions of the control system, it uses pneumatic transmission to eject the defective and qualified products on the batch fixture. For example, when the programmable logic controller determines that a certain pipe is a defective product, the ejection module is controlled to eject the defective product from the batch fixture so that the worker can carry out subsequent processing.

[0032] Induction switch: A photoelectric sensor is used to detect whether the defective products have been taken away. When the worker takes away the defective products, the induction switch can detect the change in the position of the pipeline and transmit this signal to the programmable logic controller. For example, when the worker takes away the defective products, the induction switch detects the change in the position of the pipeline and sends a signal to the programmable logic controller, which records that the defective products have been taken away.

[0033] Prompt module: After receiving the instruction from the programmable logic controller to take out the defective products, it uses flashing lights or sound alarms to send a signal to the workers, informing them that all the defective products have been taken out and that the qualified products can be taken out. For example, when all the defective products have been taken out, the indicator light of the prompt module starts flashing and a "beep" sound prompt is issued to remind the workers that they can take out the qualified products.

[0034] 2. System Implementation Process The product enters the testing stage: When the photoelectric sensor detects that the pipeline product enters the tooling station, the photoelectric 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 photoelectric sensor detects the presence of the product and immediately sends a signal to the programmable logic controller.

[0035] After receiving this signal, the PLC starts the airtightness detection unit to start the airtightness detection of the product. At this time, the PLC sends a start signal to the airtightness detection unit, such as opening the control valve to fill the pipeline with the detection gas. For example, the PLC controls the control valve to open, fills the pipeline with 4 atmospheres of compressed air, and starts the airtightness detection.

[0036] Airtightness testing stage: The pressure sensor monitors the pressure changes inside the pipeline in real time and transmits the pressure value to the programmable logic controller in the form of an analog signal. For example, during the airtightness detection process, the pressure sensor continuously detects the pressure changes inside 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.

[0037] 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 for a certain period of time (for example, the pressure change does not exceed a certain value within the set detection time), the product is judged to be qualified for air tightness; otherwise, the product is judged to be unqualified. For example, the preset qualified pressure range is 3.5-4.5 atmospheres. If the pressure value is always within this range within the detection time and the pressure change does not exceed 0.05 atmospheres, the product is judged to be qualified for air tightness; otherwise, the product is judged to be unqualified.

[0038] Coding or unqualified processing stage: If the product is judged to be qualified: The PLC controls the coding unit to code the product. A start signal is sent to the coding unit, and the product information to be coded is transmitted at the same time, such as product model, production date, etc. For example, for a qualified automobile pipe, the PLC controls the laser marking equipment to engrave the product model "CAR-Tube-001", production date "20240820" and batch number "Batch-002" on the surface of the pipe.

[0039] After the coding is completed, the programmable logic controller waits for the next operation instruction.

[0040] If a product is judged to be unqualified: The PLC controls the ejection module of the tooling station to eject the defective products. The PLC sends an action signal to the ejection module to separate the defective products from the batch fixture. For example, when the PLC determines that a pipe is defective, the ejection module is controlled to eject the defective product from the batch fixture so that the worker can carry out subsequent processing.

[0041] After ejecting the defective products, the PLC waits for the worker to take them away. When the induction switch detects that the defective products have been taken away, it sends a signal to the PLC. For example, when the worker takes away the defective products, the induction switch detects the position change of the pipeline and sends a signal to the PLC to inform the PLC that the defective products have been taken away.

[0042] Qualified product removal stage: When all the defective products have been removed, the induction switch sends a signal to the programmable logic controller, indicating that all the defective products have been processed.

[0043] After receiving this signal, the PLC controls the ejection module to eject the qualified products. Sending an action signal to the ejection module causes the qualified products to be separated from the batch fixture. For example, when all the unqualified products have been taken away, the PLC controls the ejection module to eject the qualified automotive pipes from the batch fixture so that workers can pack and store them.

[0044] After the qualified products are ejected, the PLC waits for the worker to take the qualified products away. When the induction switch detects that all the products in the pipeline have been taken away, it sends a signal to the PLC. For example, when the worker takes the qualified products away, the induction switch detects the position change of the pipeline and sends a signal to the PLC to inform the PLC that all the products have been taken away.

[0045] System reset phase: When the induction switch detects that all the pipe products have been removed, it sends a signal to the programmable logic controller.

[0046] After receiving this signal, the PLC controls the tooling station to reset and prepare to receive the next batch of pipeline products. For example, the PLC controls the batch fixture to release and the ejection module to reset, preparing for the inspection and coding of the next batch of pipeline products.

[0047] At the same time, the PLC can also perform some initialization operations on the airtightness detection unit and the coding unit, such as closing the control valve, cleaning the cache of the coding unit, etc. For example, the PLC controls the control valve to close, stops charging the detection gas into the pipeline, and cleans the cache of the laser marking device to prepare for the next coding operation.

[0048] This integrated control system for air tightness detection and coding of finished automobile pipelines improves production efficiency and quality through innovative features such as integrated design, intelligent control, classification processing and intelligent prompts, and has the following advantages: The integrated design integrates the airtightness detection and coding functions in one workstation, reducing the transfer links in the production process, improving production efficiency, and avoiding damage to products during the transfer process.

[0049] Intelligent control uses a programmable logic controller (PLC) for automated control, which can accurately determine the air tightness of the pipeline according to preset parameters, and coordinate the collaborative work of air tightness detection and coding, thereby improving the intelligence level of the system and avoiding manual misjudgment.

[0050] Classification processing and intelligent prompts are achieved through the pop-up module, sensor switch and prompt module of the tooling station to classify and pop out and remove qualified and unqualified products. The sensor switch is used to detect whether all unqualified products have been removed, and the prompt module sends out light or sound prompts to ensure that workers remove the pipelines in time to avoid omissions, thereby achieving accurate classification processing.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An integrated control system for air tightness detection and coding of finished automobile pipelines, characterized in that: The system is mainly composed 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, the coding unit, the control system and the tooling station module are all integrated on the integrated detection and coding device, wherein: The airtightness detection unit includes: an airtightness detector; a pressure sensor to monitor the pressure change inside the pipeline in real time; and a control valve to control the inlet and outlet of gas; The coding unit includes a laser marking device, which is used to mark qualified products and mark unqualified products with a conspicuous unqualified mark; The control system includes: a programmable logic controller: a core control unit to realize the automatic control of the entire system and coordinate the coordinated progress of airtightness detection and coding; a touch screen: a human-machine interaction interface to facilitate 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; The tooling station module includes: a batch fixing device that can fix a batch of pipelines at the same time; an ejection module that ejects unqualified products and qualified products in turn according to the instructions of the control system; an induction switch, an induction switch is set on each specific station to detect whether the unqualified products have been taken out; a prompt module, when all unqualified products have been taken out, the induction switch gives a signal, and the tooling station module emits a light or sound prompt.

2. According to claim 1, the integrated control system for air tightness detection and coding of finished automobile pipelines is characterized in that: The airtightness detector in the airtightness detection unit uses a differential pressure method or a direct pressure method to detect the airtightness of the pipeline. The judgment standard of the airtightness detection is expressed as: Leak rate = (initial pressure - final pressure) / test time / pipeline volume If the leakage rate is less than the set allowable leakage rate, the pipeline is considered to be airtight; otherwise, the pipeline is considered to be unqualified; the pressure sensor monitors the pressure changes inside the pipeline in real time, and converts the pressure signal into an electrical signal and transmits it to the control system; the control valve opens or closes the gas channel according to the instructions of the control system to adjust the pressure inside the pipeline.

3. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 1 is characterized in that: The control system receives the qualified signal from the airtight detection unit and sends instructions to the laser marking equipment to start the coding operation for the qualified products according to the preset product information; when the airtight detection unit detects unqualified products, the unqualified signal is transmitted to the control system, and the control system sends instructions to the laser marking equipment to mark the unqualified products with a conspicuous unqualified mark.

4. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 1 is characterized in that: The programmable logic controller in the control system writes a programmable logic controller program according to the system requirements. At the same time, the programmable logic controller communicates with the airtight detection unit, the coding unit and the equipment at the tooling station, sends control instructions and receives feedback signals. In this way, automatic control of the entire system is achieved.

5. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 4 is characterized in that: The touch screen is connected to the programmable logic controller via 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 operating data and status information in the programmable logic controller can also be displayed on the touch screen.

6. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 5 is 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 process; the photoelectric sensor is used to detect the presence or absence of the pipeline product and trigger the start and stop of the system.

7. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 1 is characterized in that: The batch fixing device adopts the form of a pneumatic clamp, which can accommodate and fix a batch of pipelines at the same time, providing a stable working platform for subsequent airtightness detection and coding operations.

8. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 7 is characterized in that: The ejection module is an auxiliary structure of the batch fixing device, and adopts pneumatic transmission to eject unqualified products and qualified products on the batch fixing device.

9. The integrated control system for air tightness detection and coding of finished automobile pipeline products according to claim 8, characterized in that: The induction switch uses a photoelectric sensor to detect whether the defective products have been taken away; when the worker takes away the defective products, the induction switch can detect the position change of the pipeline and transmit the signal to the programmable logic controller.

10. The integrated control system for air tightness detection and coding of finished automobile pipelines according to claim 9, characterized in that: After receiving the instruction of taking out all the unqualified products from the programmable logic controller, the prompt module sends a signal to the worker by means of flashing lights or sound alarms, informing the worker that all the unqualified products have been taken out and the qualified products can be taken out.

Images