Weld joint leak detection control method and system for liquefied gas steel cylinder

Abstract

The invention discloses a welding seam leakage detection control method and system for a liquefied gas steel cylinder, and relates to the technical field of gas leakage monitoring. The method comprises the following steps: controlling a steel cylinder to enter a detection station and fixing the steel cylinder through a shunting cylinder blocking device and a positioning cylinder blocking device; descending the collecting cover until the welding seam part of the steel cylinder is completely covered; starting a sealing device to seal a welding seam area; detecting the gas concentration of the weld joint part in real time by using a detection device, and comparing the detection data with a set threshold: if the detection data is greater than or equal to the set threshold, triggering an audible and visual alarm and starting a removing device to move out the steel cylinder; if the detection data is smaller than the set threshold value, the steel cylinder is made to enter the next working procedure; and uploading the detection data to a central monitoring system for recording, and enabling the vacuum device to work all the time in the whole process. According to the invention, the automation degree and timeliness of the detection of the welding seam gas leakage of the liquefied gas steel cylinder can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leakage monitoring, and in particular to a weld leakage detection control method and system for a liquefied gas cylinder. Background Art

[0002] Currently, there are two main methods for detecting gas leaks: the soapy water method and the use of handheld leak detectors. The soapy water method relies on the change in surface tension of the soapy solution caused by gas leakage. When liquefied petroleum gas (LPG) leaks from locations such as cylinder valves or welds, the airflow penetrates the soapy water film, forming bubbles due to surface tension imbalance. By observing the generation and diffusion of bubbles, the leak can be located. The core principle of handheld leak detectors, on the other hand, is based on gas sensing technology and physical signal analysis. Both methods are limited by their reliance on manual labor and cannot detect gas leaks in a timely manner. Summary of the Invention

[0003] The object of the present invention is to provide a method and system for controlling weld leak detection of liquefied gas cylinders, aiming to solve or improve at least one of the above-mentioned technical problems.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A method for controlling weld leak detection of a liquefied gas cylinder, comprising:

[0006] Control the steel cylinders to enter the inspection station and fix them through the diversion and positioning bottle blocking devices;

[0007] Lower the collection cover until it completely covers the weld seam of the cylinder;

[0008] Start the sealing device to seal the weld area;

[0009] The gas concentration in the weld is detected in real time using a detection device, and the detection data is compared with the set threshold:

[0010] If the test data is greater than or equal to the set threshold, the test result is determined to be a leak, the sound and light alarm is triggered, and the rejection device is started to remove the cylinder; if the test data is less than the set threshold, the test result is determined to be normal, and the cylinder is allowed to enter the next process;

[0011] The detection data is uploaded to the central monitoring system for recording, and the vacuum device is kept working throughout the entire process.

[0012] Optionally, the sealing device adopts a rubber airbag; the rubber airbag is used to seal the weld area.

[0013] Optionally, the gas concentration of the weld is detected in real time by a detection device, and the detection data is compared with a set threshold value. The specific process includes:

[0014] Using the detection device to independently monitor the weld to obtain corresponding detection data;

[0015] Each of the detection data is compared with a set threshold value built into the controller.

[0016] The present invention also provides a weld leak detection control system for a liquefied gas cylinder, which is used to apply the above method, comprising:

[0017] The collection cover is driven up and down by a cylinder to cover the cylinder detection area;

[0018] Sealing device, installed in the collection cover, used for welding seam sealing;

[0019] A vacuum device for detecting the sealing status of the collection cover;

[0020] Detection device, used to analyze gas concentration in real time and output signals to the controller;

[0021] The control module is used to receive detection data and control the diversion bottle blocking device, the positioning bottle blocking device, the rejection device and the alarm linkage.

[0022] Optionally, the collection hood is connected to the driving cylinder via a floating joint, and a throttle valve and a quick exhaust valve are provided on the lifting air path to buffer the movement.

[0023] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0024] The present invention discloses a weld leak detection control method and system for liquefied gas cylinders. The method comprises controlling the cylinder to enter a detection station and securing it via a diverter and a positioning device; lowering a collection hood until the weld portion of the cylinder is completely covered; activating a sealing device to seal the weld area; utilizing a detection device to detect the gas concentration in the weld portion in real time, and comparing the detection data with a set threshold value. If the detection data is greater than or equal to the set threshold value, the detection result is determined to be a leak, triggering an audible and visual alarm and activating a rejection device to remove the cylinder. If the detection data is less than the set threshold value, the detection result is determined to be normal, and the cylinder is directed to the next process. The detection data is uploaded to a central monitoring system for recording, and a vacuum device is kept in operation throughout the entire process. The present invention can improve the automation and timeliness of gas leak detection in liquefied gas cylinder welds. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 The figure is a flow chart of the weld leak detection control method for liquefied gas cylinders according to the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] The object of the present invention is to provide a method and system for controlling weld leak detection of liquefied gas cylinders, aiming to solve or improve at least one of the above-mentioned technical problems.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, the present invention provides a weld leak detection control method for a liquefied gas cylinder, comprising:

[0031] Step 1: Control the cylinder to enter the inspection station and fix it through the diversion bottle blocking device and the positioning bottle blocking device.

[0032] Step 2: Lower the collection hood until it completely covers the weld seam of the cylinder.

[0033] Step 3: Start the sealing device to seal the weld area.

[0034] Step 4: Use the detection device to detect the gas concentration in the weld in real time and compare the detection data with the set threshold:

[0035] If the detection data is greater than the set threshold, the detection result is determined to be a leak, the sound and light alarm is triggered, and the rejection device is started to remove the cylinder; if the detection data is less than or equal to the set threshold, the detection result is determined to be normal, and the cylinder enters the next process.

[0036] Step 5: Upload the detection data to the central monitoring system for recording, and keep the vacuum device working throughout the entire process.

[0037] As a further specific implementation method, the specific application of the above steps is:

[0038] Cylinder access and positioning:

[0039] When an LPG cylinder enters the inspection line, the diverter bottle stopper is activated first, ensuring that only one cylinder enters the inspection area to avoid interference. The cylinder is precisely positioned at the center of the collection hood by the positioning bottle stop cylinder to ensure detection accuracy.

[0040] Collection cover movement and sealing:

[0041] The cylinder drives the collection cover down, completely enveloping the cylinder. Sealing devices such as rubber airbags are activated to ensure the tightness of the cylinder welds and prevent external gases from interfering with the test results.

[0042] Gas extraction:

[0043] The vacuum device is kept working throughout the entire process to absorb any gas that may leak from the vacuum cover in real time, provide samples for subsequent testing, and detect the sealing status of the collection cover.

[0044] Gas Analysis and Detection: The detection device analyzes and detects the extracted gas in real time, specifically monitoring the weld seams of the cylinders. The detection device processes and analyzes the real-time data. If a leak is detected, an alarm will sound and the cylinder will be removed from the reject line for manual inspection.

[0045] The control system for applying the above method specifically includes: a collection hood, a sealing device, a vacuum device, a detection device, and a control module. The collection hood is driven up and down by a cylinder to cover the cylinder detection area; the sealing device is installed inside the collection hood to seal the weld; the vacuum device is used to detect the sealing status of the collection hood; the detection device is used to analyze gas concentration in real time and output a signal to a controller; and the control module is used to receive detection data and control the diversion and bottle blocking device, the positioning and bottle blocking device, the rejection device, and the alarm.

[0046] In this embodiment, the collecting hood is connected to the driving cylinder via a floating joint, and a throttle valve and a quick exhaust valve are provided on the lifting air path to buffer the movement.

[0047] As a specific example, Figure 1 The leak detection control method of the present invention is described in detail below by taking the leak detection system shown as an example.

[0048] Execute corresponding control based on the target leak detection system:

[0049] 1) The equipment is started, the diverter stop cylinder is reset, and the LPG liquefied petroleum gas cylinder is put in. When the sensor detects that the cylinder has entered, the positioning stop cylinder is activated, and the LPG liquefied petroleum gas cylinder is positioned at the center point of the collection cover. The diverter stop cylinder is activated to prevent subsequent cylinders from entering.

[0050] 2) After calculation, it is determined that the LPG liquefied petroleum gas cylinder is in place, and the collection cover actuation cylinder drives the collection cover to descend.

[0051] 3) The collection cover drops into place and the rubber airbag operates.

[0052] 4) The detection device starts detection and analyzes and processes data.

[0053] 5) The controller receives the detection results of each detection device in real time. When the detection value is greater than the set value, it determines that the detection result is a leak and controls the corresponding alarm to sound an alarm.

[0054] 6) After the test is completed, the rubber airbag is reset and the collection cover action cylinder drives the collection cover to reset.

[0055] 7) After the collection cover is reset into place, the positioning bottle stop cylinder is reset, the LPG liquefied petroleum gas cylinder is released, and at the same time the diversion bottle stop cylinder is reset and the subsequent cylinder is placed in.

[0056] 8) When the LPG liquefied petroleum gas cylinder reaches the sensor position, the controller will activate the rejection device when it receives the detection result of leakage, and reject the cylinder and enter the rejection line. When the controller receives the detection result of normal, the cylinder usually passes.

[0057] 9) Simultaneously, various detection devices are used to monitor the environment in real time.

[0058] 10) Send the test results to the central monitoring PC system and keep the vacuum device working throughout the process.

[0059] Repeat the above steps continuously to complete the inspection of LPG liquefied petroleum gas cylinder welds one by one.

[0060] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for controlling weld leak detection of a liquefied gas cylinder, characterized in that: include: Control the steel cylinders to enter the inspection station and fix them through the diversion bottle blocking device and the positioning bottle blocking device; Lower the collection cover until it completely covers the weld seam of the cylinder; Start the sealing device to seal the weld area; The gas concentration in the weld is detected in real time using a detection device, and the detection data is compared with the set threshold: If the test data is greater than or equal to the set threshold, the test result is determined to be a leak, the sound and light alarm is triggered, and the rejection device is started to remove the cylinder; if the test data is less than the set threshold, the test result is determined to be normal, and the cylinder is allowed to enter the next process; The detection data is uploaded to the central monitoring system for recording, and the vacuum device is kept working throughout the entire process.

2. The weld leak detection control method for liquefied gas cylinders according to claim 1, characterized in that: The sealing device adopts a rubber airbag; the rubber airbag is used to seal the weld area.

3. The weld leak detection control method for liquefied gas cylinders according to claim 1, characterized in that: The gas concentration of the weld is detected in real time by the detection device, and the detection data is compared with the set threshold value. The specific process includes: Using the detection device to independently monitor the weld to obtain corresponding detection data; Each of the detection data is compared with a set threshold value built into the controller.

4. A weld leak detection control system for a liquefied gas cylinder, adapted to apply the method according to any one of claims 1 to 3, characterized in that: include: The collection cover is driven up and down by a cylinder to cover the cylinder detection area; Sealing device, installed in the collection cover, used for welding seam sealing; A vacuum device for detecting the sealing status of the collection cover; Detection device, used to analyze gas concentration in real time and output signals to the controller; The control module is used to receive detection data and control the diversion bottle blocking device, the positioning bottle blocking device, the rejection device and the alarm linkage.

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