Automatic bottom scraping and bottom airtightness detection method for steel single-opening gas cylinder

Abstract

The invention relates to the technical field of pressure vessel manufacturing, and discloses an automatic bottom scraping and bottom airtightness detection method for a steel single-opening gas cylinder, which comprises a machine tool main body and a conveying roller way, and an automatic bottom scraping assembly and an airtightness detection assembly are arranged at the front end of the machine tool main body; the automatic bottom scraping assembly comprises a rotating shaft; a telescopic table is arranged at the front end of the rotating shaft, and a bottom scraping blade is arranged at the front end of the telescopic table and makes contact with the inner bottom face of the workpiece. The airtightness detection assembly comprises an internal sealed cabin, the internal sealed cabin comprises a flexible ring arranged at the front section of the rotating shaft, and the outer edge of the flexible ring abuts against the inner surface of the bottom of the workpiece; the outer edge of the transparent detection box abuts against the outer surface of the bottom of the workpiece. And liquid for detection is arranged in the transparent detection box. According to the invention, bottom scraping and air tightness detection are carried out in the same process, so that the production efficiency is improved, the comprehensiveness and accuracy of detection are ensured, the intermediate transfer process is reduced, one-time cutting detection is realized, and the quality of the container is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel manufacturing, and in particular to an automatic bottom scraping and bottom airtightness detection method for a steel single-bottle-mouth gas cylinder. Background Art

[0002] As a high-quality clean energy, natural gas is regarded as an ideal substitute for gasoline due to its high efficiency and environmental protection characteristics, and has shown great application potential in the field of transportation. However, in the development process of natural gas vehicles, the safety of its application has always been a key issue that cannot be ignored. Especially in the design and manufacture of natural gas storage and supply systems, for natural gas storage, the natural gas storage pressure vessels currently generally use steel pipe spinning bottom technology to manufacture, and the bottom fusion quality is directly related to the overall performance and safety of the container. If the bottom fusion is poor, there will be a serious risk of gas leakage, which will not only affect the normal operation of the vehicle, but may also cause safety accidents.

[0003] At present, for the manufacture of pressure vessels, after the bottom is fused, the inner surface quality usually needs to be removed by cutting or other methods to ensure the smoothness and flatness of the inner surface, and the bottom needs to be tested for airtightness. However, in the existing technical process, cutting and subsequent airtightness testing are two independent steps. This separate operation mode not only increases production time, but may also lead to waste of resources. More importantly, due to the lack of close connection between cutting and airtightness testing, operational omissions may occur, making it difficult to ensure the comprehensiveness and accuracy of the test, leaving potential safety hazards.

[0004] In addition, this separate production process may also increase the risk of independent operation or monitoring errors. Improper cutting or lax air tightness testing may result in substandard product quality, requiring rework, further increasing production costs or causing safety accidents. Summary of the invention

[0005] The present invention aims to provide a method for automatically scraping the bottom of a steel single-mouth gas cylinder and detecting the bottom airtightness, so as to solve the problems in the prior art that the production efficiency of pressure vessels is low and it is difficult to ensure the stability of production quality.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for automatic bottom scraping and bottom airtightness detection of steel single-mouth gas cylinders. This scheme sets the bottom scraping and airtightness detection to be carried out in the same process, which improves production efficiency while ensuring the comprehensiveness and accuracy of the detection, reducing the intermediate transfer process, realizing one-time cutting detection, and effectively improving the quality of the container. It includes a machine tool body and a conveyor roller, and the workpiece is located on the conveyor roller; an automatic bottom scraping component and an airtightness detection component are provided at the front end of the machine tool body; the automatic bottom scraping component includes a rotating shaft provided at the front end of the machine tool body, the rotating shaft is provided above the conveyor roller, and the workpiece is sleeved on the outside of the rotating shaft; a telescopic table is provided at the front end of the rotating shaft, and a bottom scraping blade is provided at the front end of the telescopic table, and the bottom scraping blade contacts the inner bottom surface of the workpiece;

[0007] The airtight detection component includes an internal sealed cabin, which includes a flexible ring arranged at the front section of the rotating shaft, and the outer edge of the flexible ring abuts against the inner surface of the bottom of the workpiece; it also includes a transparent detection box arranged on the outer side of the bottom of the workpiece, and the outer edge of the transparent detection box abuts against the outer surface of the bottom of the workpiece; liquid for detection is arranged in the transparent detection box.

[0008] At the same time, the present invention also provides a method for automatically scraping the bottom of a steel single-bottom gas cylinder and detecting the bottom airtightness, which is used in the above-mentioned automatic scraping the bottom of a steel single-bottom gas cylinder and detecting the bottom airtightness, and includes the following steps:

[0009] Step 1, the workpiece is transferred to the bottom scraping station and positioned from the bottom by a positioning mechanism; according to the diameter of the workpiece, the workpiece is positioned and clamped by a lifting mechanism and a clamping mechanism;

[0010] Step 2, controlling the rotating shaft to reach the inner surface of the bottom of the workpiece, and controlling the scraping blade to extend to cut and scrape the remaining material at the bottom of the workpiece;

[0011] Step 3, after the bottom scraping is completed, the bottom scraping blade is controlled to retract, and the flexible ring is controlled to extend and press on the bottom surface of the workpiece, so that the bottom forms an internal sealed cabin state;

[0012] Step 4, controlling the outer edge of the transparent detection box to press against the outer surface of the bottom of the workpiece, so that it forms an external sealed cabin state with the outer surface of the bottom of the workpiece; injecting a certain amount of liquid into the transparent detection box, and pressurizing the internal sealed cabin;

[0013] Step 5: After maintaining the pressure for a period of time, observe whether there are bubbles in the liquid in the transparent detection box; after completing the air tightness test, recover the liquid, and withdraw the workpiece to switch to the next workpiece, completing a one-time bottom scraping and air tightness test.

[0014] The principles and advantages of this solution are:

[0015] At present, the air tightness test of pressure vessels generally requires sealing the entire container to form a sealed state inside, and then filling it with a certain pressure to test the air tightness of the container. Therefore, larger testing equipment is required, and the required operating space will also be larger. Therefore, the existing operating process is to scrape the bottom first, then remove internal impurities, and then seal the container before performing an air tightness test. As a result, the existing bottom scraping and air tightness test are two separate steps, which increases the difficulty of operation and requires transportation and cleaning processes, resulting in a long operating cycle, low production efficiency, and the inability to guarantee the comprehensiveness and accuracy of the test.

[0016] However, this solution breaks away from the inherent thinking that the entire container needs to be sealed, and instead performs an airtightness test on the bottom of the container when only scraping the bottom of the container. This also breaks away from the limitation of using fixed airtightness testing equipment, and designs a method that only needs to test the bottom of the container and the scraped bottom part. This solution adopts the structure of a rotating shaft, combined with an internal sealed cabin and an external sealed cabin, so as to form an internal and external sealed state for the bottom of the workpiece. By pressurizing and injecting water, after the scraping is completed, the airtightness test can be directly performed without transferring the workpiece, and the scraping and airtightness test operations can be completed at one time, achieving simultaneous completion, reducing the intermediate transfer process, reducing the processing time, and further simplifying the processing equipment and processes, effectively reducing production costs and improving production efficiency. In addition, performing bottom scraping and airtightness testing at the same time can ensure the accuracy of the workpiece position, ensure effective positioning detection of the processing surface, and ensure the comprehensiveness and accuracy of the detection.

[0017] Furthermore, it also includes a positioning mechanism, a lifting mechanism and a clamping mechanism; the positioning mechanism is arranged on the conveying roller and is located at the bottom of the workpiece to position the workpiece; the lifting mechanism is arranged below the conveying roller and fixes the workpiece from the bottom by lifting; the clamping mechanism is arranged above the rotating shaft and is used to fix the workpiece from the top.

[0018] Furthermore, it also includes a water tank, which is connected to the transparent detection box through a pipeline, and the liquid in the water tank is transported to the transparent detection box during detection.

[0019] Furthermore, the flexible ring is a soft sealing foam material ring.

[0020] Furthermore, the flexible ring is arranged 35 mm away from the front end of the rotating shaft to ensure that the flexible ring can contact the inner surface of the bottom of the workpiece to form an internal sealed cabin, while ensuring that the end of the rotating shaft will not scratch the inner surface of the bottom of the workpiece, and complete the airtightness test while ensuring the quality of the bottom of the workpiece.

[0021] Furthermore, a recovery hole is provided at the front end of the rotating shaft, the telescopic platform is arranged in the recovery hole, and the scraping blade moves telescopically in the recovery hole along with the telescopic platform.

[0022] Furthermore, in step 2, the rotating shaft is first controlled to move quickly close to the bottom of the workpiece, and when close to the bottom of the workpiece, the rotating shaft is started to rotate and switched to slow forward movement to cut the remaining material at the bottom of the workpiece.

[0023] Furthermore, in step 4, the amount of liquid injected into the transparent detection box is more than two-thirds of the volume of the transparent detection box, but not full; the pressure value applied to the internal sealed cabin is set according to the pressure level of the workpiece.

[0024] Furthermore, in step 5, the pressure holding time is greater than 60 seconds. The pressure holding time is fully guaranteed to ensure the effectiveness and stability of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a structural schematic diagram of an automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder.

[0026] Figure 2 The invention discloses a side view of an automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder.

[0027] Figure 3 The present invention is a schematic flow chart of a method for automatically scraping the bottom of a steel single-mouth gas cylinder and detecting bottom airtightness. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] The figure marks in the drawings of the specification include: machine tool body 1, conveyor roller 2, workpiece 3, lifting mechanism 4, positioning mechanism 5, clamping mechanism 6, L-shaped support rod 7, pressure block 8, rotating shaft 9, telescopic table 10, scraping blade 11, recovery hole 12, internal sealing cabin 13, flexible ring 14, transparent detection box 15, water storage tank 16, pipeline 17, water inlet 18, water outlet 19.

[0030] Embodiment 1

[0031] This embodiment is basically as shown in the attached Figure 1 As shown, a steel single-bottle-mouth gas cylinder automatic bottom scraping and airtightness detection structure realizes automatic bottom scraping by turning, and the bottom scraping processing and airtightness detection are carried out simultaneously, completing a one-time processing operation, reducing the intermediate transfer process, improving production efficiency, and ensuring production quality. It includes a machine tool body 1 and a conveyor roller 2, and the conveyor roller 2 is arranged in front of the machine tool body 1 to facilitate the conveying of a workpiece 3, so that the workpiece 3 is located on the conveyor roller 2 during the processing.

[0032] A lifting mechanism 4 is provided below the conveying roller 2. By controlling the lifting height of the lifting mechanism 4, the workpiece 3 can be fixed from below, so that automatic positioning and fixing can be achieved according to the diameter of the workpiece 3 to meet the fixing requirements of various workpieces 3. In this embodiment, the lifting mechanism 4 can adopt a screw nut lifting mechanism, a hydraulic lifting mechanism, a pneumatic lifting mechanism, a rotating shaft and other structures, which are not limited here, and a hydraulic lifting mechanism is usually adopted. In this embodiment, an arc plate is provided on the top of the lifting mechanism 4, which is supported on the lower end of the workpiece 3 by the arc plate, so that the workpiece 3 is fixed from below to prevent the workpiece 3 from moving and also to avoid scratching the workpiece 3.

[0033] A positioning mechanism 5 and a clamping mechanism 6 are also provided above the conveyor roller 2. The positioning mechanism 5 is installed on the conveyor roller 2 and is located at the bottom of the workpiece 3, and is aligned with the rotating shaft 9, so that the workpiece 3 is positioned by the positioning mechanism 5 during transportation, ensuring that the workpiece 3 is transported to the bottom scraping station. In this embodiment, the positioning mechanism 5 is a positioning plate installed on one side of the conveyor roller 2, and the positioning plate is placed horizontally above the conveyor roller 2 to position the workpiece 3. After the positioning is completed, the positioning mechanism 5 is controlled to withdraw from the conveyor roller 2 and placed on one side.

[0034] The clamping mechanism 6 is installed above the conveyor roller 2 and clamps and positions the workpiece 3 from above. In this embodiment, the clamping mechanism 6 includes an L-shaped support rod 7 hinged to one side of the conveyor roller 2, and a pressure block 8 is provided at the lower end of the L-shaped support rod 7. By adjusting the height of the L-shaped support rod 7, the height of the pressure block 8 is adjusted to clamp and fix the workpiece 3.

[0035] An automatic bottom scraping assembly and an airtightness detection assembly are provided at the front end of the machine tool body 1 .

[0036] In this embodiment, the automatic scraping assembly includes a rotating shaft 9 installed at the front end of the machine tool body 1, the rotating shaft 9 is installed above the conveying roller 2, and the clamping mechanism 6 is installed above the rotating shaft 9, so that the workpiece 3 can be sleeved on the outside of the rotating shaft 9. In this embodiment, the rotating shaft 9 is a retractable and rotatable mechanical shaft, and the process is controlled by the power drive of the machine tool body 1. Figure 2 As shown, a telescopic table 10 is installed at the front end of the rotating shaft 9, and a bottom scraping blade 11 is installed at the front end of the telescopic table 10. The bottom scraping blade 11 can contact the inner bottom surface of the workpiece 3, thereby completing the cutting of the inner surface of the bottom of the workpiece 3.

[0037] In this embodiment, a recovery hole 12 is provided at the front end of the rotating shaft 9, and the telescopic platform 10 is installed in the recovery hole 12 through a telescopic control mechanism, and the bottom scraping blade 11 moves forward and backward with the telescopic platform 10, thereby telescopically moving in the recovery hole 12 to achieve the extension and retraction of the bottom scraping blade 11. In this embodiment, the telescopic control mechanism can be implemented by existing structures such as a motor telescopic rod, an elastic telescopic rod, a telescopic arm, a telescopic pipe, etc., which are not limited here.

[0038] The airtight detection assembly includes an internal sealed cabin 13 of an overall circular structure. In this embodiment, the internal sealed cabin 13 includes a flexible ring 14 installed at the front section of the rotating shaft 9, and the outer edge of the flexible ring 14 can abut against the inner surface of the bottom of the workpiece 3. In this embodiment, the flexible ring 14 adopts a soft sealing foam material ring, and the flexible ring 14 is arranged at 35mm from the front end of the rotating shaft 9 to ensure that the flexible ring 14 can contact the inner surface of the bottom of the workpiece 3 and form an internal sealed cabin state. At the same time, the front end of the rotating shaft 9 will not scratch the bottom of the workpiece 3, ensuring that the bottom of the workpiece 3 is smooth and flat.

[0039] It also includes a transparent detection box 15 installed on the outside of the bottom of the workpiece 3, and the outer edge of the transparent detection box 15 abuts against the outer surface of the bottom of the workpiece 3. In this embodiment, the outer edge of the transparent detection box 15 is a soft foam material to ensure that the transparent detection box 15 can form an external sealed cabin state with the outer side of the bottom of the workpiece 3. At the same time, a liquid for detection is provided in the transparent detection box 15.

[0040] It also includes a water tank 16, which is connected to the transparent detection box 15 through a pipe 17. During detection, the liquid in the water tank 16 is transported to the transparent detection box 15. In this embodiment, a water inlet 18 and a water outlet 19 are provided at the bottom of the transparent detection box 15, and a one-way control valve is provided on the water inlet 18 and the water outlet 19. The transparent detection box 15 is connected to the water tank 16 through the water inlet 18 and the water outlet 19. When water injection is required, the liquid in the water tank 16 is injected into the transparent detection box 15 through the control of the water inlet 18. When the detection is completed, the liquid in the transparent detection box 15 is pumped back into the water tank 16 through the water outlet 19, so as to realize recycling and reduce resource waste.

[0041] At present, airtightness testing is generally carried out by filling a certain pressure. However, due to the use environment required by the airtightness testing equipment used, it is necessary to ensure that the inside of the container remains clean and dry, and there are no impurities or contaminants that may affect the test results. The bottom scraping process of the container is an important pretreatment process in the container manufacturing process. Its purpose is to remove impurities, dirt or residual welding spatter on the inner wall of the container to ensure the cleanliness of the container and the smooth progress of subsequent processes. Therefore, in the conventional bottom scraping and airtightness testing process, the two will be operated separately because different equipment is used. It is not expected that the two need to be carried out at the same time, and the impurities generated by the bottom scraping will not affect the airtightness testing equipment.

[0042] At the same time, the current airtightness test of pressure vessels generally requires the entire container to be sealed to form a sealed state inside, and then the inside is tested by airtightness testing equipment to achieve the airtightness test of the container. Therefore, a larger testing equipment is required, and the required operating space will also be larger. Therefore, the existing operating process is to first scrape the bottom of the container on a bottom scraping device, and then remove the internal impurities to make the entire internal space completely free of impurities, and then transfer the container to the airtight equipment, seal the container, and then perform an airtightness test. As a result, the existing bottom scraping and airtightness testing are two separate steps, which increases the difficulty of operation and requires a transportation and cleaning process, resulting in a long operation cycle, low production efficiency, and the inability to guarantee the comprehensiveness and accuracy of the test.

[0043] At present, when the air tightness test of the pressure vessel is carried out, its main purpose is to verify the tightness of the pressure vessel, that is, to check whether there is leakage in each connection part of the container. Therefore, in order to ensure the comprehensiveness and effectiveness of the test, it is inclined to test the entire container. Therefore, the detection equipment used also needs to be able to match the detection requirements of the entire container. However, with the development of technology, the main production steps of the existing pressure vessel are to directly fuse at the bottom and then scrape the bottom, so its connection point is only at the bottom. However, due to the limitations of traditional detection methods and detection equipment, it is still confined to the mode of air tightness detection of the entire container, which is believed to guarantee a more comprehensive detection standard. In addition, for the pressure vessel, before the overall air tightness test is carried out, the inside needs to be cleaned up, but due to its large size and the air tightness detection equipment used is a specific equipment, it also needs to be accurately adjusted and operated during use to ensure high precision. Therefore, it is also difficult to effectively integrate a variety of equipment for scraping, cleaning and air tightness detection, and it is also impossible to guarantee its accuracy and reliability.

[0044] The present solution is to break away from the inherent thinking that the entire container needs to be sealed, and instead, based on scraping the bottom of the container only, simultaneously perform an airtightness test on the part of the bottom of the container that needs to be tested. This also breaks away from the limitation of using fixed airtightness testing equipment, and designs a method that only requires local airtightness testing of the bottom of the container, that is, the scraped bottom part. In other words, it is only necessary to perform an airtightness test on the scraped bottom part, and there is no need to perform an airtightness test on the entire container. Therefore, this solution adopts a structure combined with a rotating shaft, and sets up an internal sealed cabin and an external sealed cabin for the bottom structure, and the airtightness test of the bottom can be completed synchronously after scraping the bottom by pressurizing and injecting water respectively, thereby realizing a one-time bottom scraping test.

[0045] At the same time, in order to ensure the accuracy of airtightness detection, after the bottom scraping is completed, it is only necessary to discharge the internal impurities a certain distance away from the internal sealed cabin, without having to discharge the impurities completely. This further reduces the difficulty of operation and the transfer process of containers, ensuring that the detection operation can be carried out simultaneously after the bottom scraping is completed, thereby ensuring the accuracy of the detection.

[0046] Embodiment 2

[0047] This embodiment provides a method for automatically scraping the bottom of a steel single-bottom gas cylinder and detecting the bottom airtightness, which is applied to the above-mentioned automatic scraping bottom and airtightness detection structure of a steel single-bottom gas cylinder, as shown in the attached Figure 3 As shown, the method comprises the following steps:

[0048] S1, the workpiece 3 is transferred to the bottom scraping station and positioned from the bottom by the positioning mechanism 5; according to the diameter of the workpiece 3, the workpiece is positioned and clamped by the lifting mechanism 4 and the clamping mechanism 6.

[0049] Specifically, the workpiece 3 is transported to the bottom scraping station through the conveying roller 2, and then the position of the workpiece 3 is positioned and determined by the positioning mechanism 5 in a bottom positioning manner to ensure that the workpiece 3 stops being transported after reaching the bottom scraping station. In this embodiment, the positioning mechanism 5 can be used for a workpiece 3 with a length of up to 2500 mm, so as to meet the conveying, positioning and installation of various workpieces 3 and improve versatility.

[0050] According to the current diameter of the workpiece 3, the workpiece diameter parameter is input, and the lifting mechanism 4 is controlled to move up and down to perform automatic positioning, so that the arc plate abuts against the lower end of the workpiece 3, and the lower part of the workpiece 3 is positioned and fixed. After the positioning is completed, the clamping mechanism 6 is controlled to clamp and fix the workpiece 3 from above. In this embodiment, the workpiece diameter range that can be covered is 200-600mm, so as to meet the clamping and fixing requirements of various workpieces and improve versatility.

[0051] S2, controlling the rotating shaft 9 to reach the inner surface of the bottom of the workpiece 3, and controlling the bottom scraping blade to extend to cut and scrape the residual material at the bottom of the workpiece.

[0052] In this embodiment, after the bottom scraping program is started, the rotating shaft 9 is first controlled to move quickly close to the bottom of the workpiece 3, and when close to the bottom of the workpiece 3, the rotating shaft 9 is started to rotate and then slowly advances, so that the workpiece 3 is sleeved on the outside of the rotating shaft 9, and the rotating shaft 9 is placed inside the workpiece 3. The telescopic table 10 is controlled to extend, so that the bottom scraping blade 11 rotates and contacts the bottom of the workpiece 3, and the residual material at the bottom of the workpiece 3 is cut.

[0053] S3, after the bottom scraping is completed, the bottom scraping blade 11 is controlled to retract, and the flexible ring 14 is controlled to extend and press on the bottom surface of the workpiece 3, so that the bottom forms an internal sealed cabin state.

[0054] In this embodiment, before the flexible ring 14 is controlled to extend, the bottom can be cleaned by blowing air through the pressure structure to blow the impurities at the bottom away from the bottom range, and then the flexible ring 14 is started to extend to ensure that there are no impurities in the internal sealed cabin range, and at the same time, it is not necessary to discharge all the impurities generated by scraping the bottom, thereby reducing the workload and operating difficulty, and ensuring the implementation conditions and requirements in the airtight detection area. In this embodiment, the internal sealed cabin is a circular structure, and the flexible ring 14 is controlled to abut against the bottom of the workpiece 3 by controlling the movement of the rotating shaft 9, thereby forming a sealed state.

[0055] S4, control the outer edge of the transparent detection box 15 to press on the outer surface of the bottom of the workpiece 3, so that it forms an external sealed cabin state with the outer surface of the bottom of the workpiece 3; inject a certain amount of liquid into the transparent detection box 15, and pressurize the internal sealed cabin 13.

[0056] In this embodiment, after the transparent detection box 15 is controlled to press on the outer surface of the bottom of the workpiece 3, the water in the water storage tank 16 is pumped out and transported through the pipeline 17, and liquid is injected into the transparent detection box 15 through the water inlet 18. In this embodiment, the amount of liquid injected is more than two-thirds of the volume of the transparent detection box 15, but not filled up, so as to ensure the internal sealing state and facilitate observation. In this embodiment, the liquid can be water.

[0057] After completion, the internal sealed cabin 13 is pressurized, and the pressure value applied to the internal sealed cabin 13 is set according to the pressure level of the workpiece, and specifically can be set to a pressure of 20 MPa or 30 MPa.

[0058] S5, after maintaining the pressure for a period of time, observe whether there are bubbles in the liquid in the transparent detection box; after completing the air tightness test, recover the liquid, and withdraw the workpiece to switch to the next workpiece, completing a one-time bottom scraping and air tightness test.

[0059] In this embodiment, the pressure holding time is greater than 60 seconds. Then observe whether there are bubbles in the transparent detection box 15 to determine whether there is leakage. If there are bubbles, it indicates that there is leakage and it is unqualified. If there are no bubbles, it is qualified and the air tightness test is completed.

[0060] After the inspection is completed, the water in the transparent inspection box 15 is pumped back into the water storage tank 16 through the water outlet 19, and then the internal sealed cabin 13 is depressurized and returned to the flexible ring 14. After the pressure is released, the transparent inspection box 15 is retreated about 150 mm along the axial direction of the workpiece and laterally retreated to outside the range of the conveyor roller 2.

[0061] Secondly, after the rotating shaft 9, the clamping mechanism 6 and the lifting mechanism 4 are retracted in sequence, the workpiece 3 is withdrawn, and after switching to the next workpiece, the bottom scraping air tightness detection operation is performed.

[0062] In this embodiment, by adopting the structure of the rotating shaft 9, combined with the internal and external sealed cabins, the bottom of the workpiece 3 is sealed inside and outside, and by pressurizing and injecting water, after the bottom is scraped, the air tightness test can be directly performed without transferring the workpiece, and the bottom scraping and air tightness test operations can be completed at one time, which can be completed at the same time, reducing the intermediate transfer process, reducing the processing time, and further simplifying the processing equipment and process, effectively reducing production costs and improving production efficiency. In addition, the bottom scraping and air tightness test are performed simultaneously, which can ensure the accuracy of the position of the workpiece 3, ensure the effective positioning test of the processing surface, and ensure the comprehensiveness and accuracy of the test.

[0063] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder, characterized in that: The machine tool comprises a machine tool body and a conveying roller, and the workpiece is located on the conveying roller; an automatic bottom scraping assembly and an airtightness detection assembly are arranged at the front end of the machine tool body; the automatic bottom scraping assembly comprises a rotating shaft arranged at the front end of the machine tool body, the rotating shaft is arranged above the conveying roller, and the workpiece is sleeved outside the rotating shaft; a telescopic platform is arranged at the front end of the rotating shaft, and a bottom scraping blade is arranged at the front end of the telescopic platform, and the bottom scraping blade contacts the inner bottom surface of the workpiece; The airtight detection component includes an internal sealed cabin, which includes a flexible ring arranged at the front section of the rotating shaft, and the outer edge of the flexible ring abuts against the inner surface of the bottom of the workpiece; it also includes a transparent detection box arranged on the outer side of the bottom of the workpiece, and the outer edge of the transparent detection box abuts against the outer surface of the bottom of the workpiece; liquid for detection is arranged in the transparent detection box.

2. The automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder according to claim 1 is characterized by: It also includes a positioning mechanism, a lifting mechanism and a clamping mechanism; the positioning mechanism is arranged on the conveying roller and is located at the bottom of the workpiece to position the workpiece; the lifting mechanism is arranged below the conveying roller and fixes the workpiece from below by lifting; the clamping mechanism is arranged above the rotating shaft and is used to fix the workpiece from above.

3. The automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder according to claim 1 is characterized by: It also includes a water storage tank, which is connected to the transparent detection box through a pipeline, and the liquid in the water storage tank is transported to the transparent detection box during detection.

4. The automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder according to claim 1 is characterized by: The flexible ring is a soft sealing foam material ring.

5. The automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder according to claim 1 is characterized by: The flexible ring is arranged at a distance of 35 mm from the front end of the rotating shaft.

6. The automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder according to claim 1 is characterized by: A recovery hole is provided at the front end of the rotating shaft, the telescopic platform is arranged in the recovery hole, and the bottom scraping blade moves telescopically in the recovery hole along with the telescopic platform.

7. A method for automatically scraping the bottom and detecting the bottom airtightness of a steel single-mouth gas cylinder, characterized in that: An automatic bottom scraping and airtightness detection structure for a steel single-mouth gas cylinder as described in any one of claims 1 to 6 comprises the following steps: Step 1, the workpiece is transferred to the bottom scraping station and positioned from the bottom by a positioning mechanism; according to the diameter of the workpiece, the workpiece is positioned and clamped by a lifting mechanism and a clamping mechanism; Step 2, controlling the rotating shaft to reach the inner surface of the bottom of the workpiece, and controlling the scraping blade to extend to cut and scrape the remaining material at the bottom of the workpiece; Step 3, after the bottom scraping is completed, the bottom scraping blade is controlled to retract, and the flexible ring is controlled to extend and press on the bottom surface of the workpiece, so that the bottom forms an internal sealed cabin state; Step 4, controlling the outer edge of the transparent detection box to press against the outer surface of the bottom of the workpiece, so that it forms an external sealed cabin state with the outer surface of the bottom of the workpiece; injecting a certain amount of liquid into the transparent detection box, and pressurizing the internal sealed cabin; Step 5: After maintaining the pressure for a period of time, observe whether there are bubbles in the liquid in the transparent detection box; after completing the air tightness test, recover the liquid, and withdraw the workpiece to switch to the next workpiece, completing a one-time bottom scraping and air tightness test.

8. The method for automatically scraping the bottom and detecting the bottom airtightness of a steel single-mouth gas cylinder according to claim 7, characterized in that: In step 2, the rotary axis is first controlled to move quickly close to the bottom of the workpiece, and when close to the bottom of the workpiece, the rotary axis is started to rotate and switched to slow forward movement to cut the remaining material at the bottom of the workpiece.

9. The method for automatically scraping the bottom and detecting the bottom airtightness of a steel single-mouth gas cylinder according to claim 7, characterized in that: In step 4, the amount of liquid injected into the transparent detection box is more than two-thirds of the volume of the transparent detection box, but not full; the pressure value applied to the internal sealed cabin is set according to the pressure level of the workpiece.

10. The method for automatically scraping the bottom and detecting the bottom airtightness of a steel single-mouth gas cylinder according to claim 8, characterized in that: In step 5, the holding time is greater than 60 seconds.

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