Air tightness detector for stainless steel welding coil pipe

Abstract

The invention relates to the technical field of airtightness detection, and particularly discloses a stainless steel welding coil airtightness detector, which comprises a supporting base horizontally placed on the ground, a water storage tank is fixedly mounted in the middle of the upper surface of the supporting base, and a control panel is fixedly mounted on the outer surface of the front side of the water storage tank. A water injection pipe is fixedly installed at the right end of the front side of the water storage tank, and a litmus acid-base indicator is added into water in the water storage tank. According to the air tightness detector for the stainless steel welding coil pipe, the mounting roller and the stainless steel coil pipe are put into the water storage tank through the telescopic air cylinder, then nitric oxide gas in the gas storage tank is conveyed into the stainless steel coil pipe through the conveying pump, and the pressure is controlled; the nitric oxide gas can flow into the water storage tank to react with water to form an acid solution, the acid solution and the litmus indicator in the water storage tank change color, and a worker can better observe through color change.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, in particular to an air tightness detector for a stainless steel welded coil. Background Art

[0002] Stainless steel coil is a kind of pipe commonly used in various industrial and commercial applications. It is a spiral pipe structure made of stainless steel. It needs to ensure air tightness when in use. Therefore, it needs to be tested with an air tightness detection device during production to select defective products with air leaks.

[0003] In the prior art, a Chinese patent with application number CN201711228050.5 discloses a stainless steel pipe air tightness detection device, including a frame, on which a feeding mechanism, a wheel rotating mechanism, a pressing mechanism and a unloading mechanism are arranged; the wheel rotating mechanism includes two rotatable turntables, on which a plurality of groups of clamping components corresponding to each other and retractable in the axial direction are evenly distributed along the circumferential direction; the outer end of each clamping component on the turntable on one side is respectively connected to a one-way valve, and the outer end of each clamping component on the turntable on the other side is respectively connected to a pressure sensor; the feeding mechanism includes a hopper and a feeding robot arm, the hopper is located obliquely above between the two turntables, and the feeding robot arm is located below the hopper; the pressing mechanism is arranged on the outer side of the wheel rotating mechanism and corresponds to the outer end of a group of clamping components rotated to the hopper outlet; the unloading mechanism is arranged below the feeding mechanism.

[0004] For another example in the prior art, a Chinese patent with application number CN202222642590.0 discloses an air tightness detection device for stainless steel welded coils, including a box body, a gas tank is provided on one side of the box body, a main valve is provided on the top of the gas tank, a coil body is provided inside the box body, a sealing mechanism is fixed to one end of the coil body, a connecting mechanism is fixed to the other end of the coil body, and the mechanism and the main valve are connected by a pipeline. The utility model uses the gas tank, box body and sealing mechanism to seal the coil body by the sealing mechanism, adds a proper amount of water to the inside of the box body, and after the compressed air inside the gas tank is filled into the coil body, the air tightness detection of the coil body can be realized by checking whether there are bubbles.

[0005] As another example in the prior art, a Chinese patent with application number CN201811334050.8 discloses a coil air tightness detection device, which includes a base, on which a main bracket and a water tank are installed, and a baffle is also provided on the base. The device is characterized in that a positioning plate is provided in the middle of the main bracket and is fixed on the baffle, a track is installed on the main bracket, a hydraulic cylinder is installed on the positioning plate, and a lifting frame fixed on the track is connected to the bottom of the hydraulic cylinder.

[0006] Based on the above materials, it can be known that in the prior art, the coil is generally pressurized and then placed in a water pool to observe whether bubbles are generated to determine the air tightness. However, this method has certain defects during actual use. For example, when the crack in the coil is very small, the bubbles generated by the leak are also very small, and the crack may not be observed, resulting in missed judgment. Summary of the invention

[0007] The object of the present invention is to provide a stainless steel welded coil air tightness detector to solve the problem of missed detection due to small bubbles in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a stainless steel welded coil air tightness detector, comprising a support base placed horizontally on the ground, a water tank is fixedly installed at the middle position of the upper surface of the support base, a control panel is fixedly installed on the front outer surface of the water tank, and a water injection pipe is fixedly installed at the right end of the front side of the water tank, a litmus acid-base indicator is added to the water inside the water tank, telescopic cylinders fixedly installed with the support base are arranged on the left and right sides of the water tank, a mounting frame is fixedly installed on the top of the telescopic cylinder, and a transversely arranged mounting roller is placed at the lower end of the mounting frame, and the mounting roller A stainless steel coil that needs to be tested for air tightness is arranged on the outside, and the left and right ends of the stainless steel coil are sealed by sealing joints; an air storage tank is fixedly installed on the left side of the water tank, and nitric oxide gas is stored inside the air storage tank, and a delivery pump is fixedly installed on the upper surface of the air storage tank, and the delivery pump is connected to the left sealing joint through a delivery pipe; an outer sleeve is installed on the outside of the installation roller, and a fixed sponge for squeezing and fixing the stainless steel coil is fixedly installed on the outer surface of the outer sleeve, and an alkaline sodium hydroxide solution is filled inside the installation roller, and a magnetic attraction mechanism for driving the outer sleeve to reciprocate is arranged inside the installation roller.

[0009] Preferably, the mounting frame forms a lifting structure with the water tank through a telescopic cylinder, and a second stirring blade is rotatably installed inside the water tank, and filling blocks for raising the water level are fixedly installed at the four corners inside the water tank.

[0010] Preferably, a first heater is fixedly installed inside the air storage box, and a pressure gauge for detecting pressure changes is fixedly installed outside the bottom end of the delivery pipe.

[0011] Preferably, the magnetic attraction mechanism comprises mounting blocks installed at the left and right ends of the mounting roller and adsorption magnetic blocks fixedly installed at the upper and lower ends of the mounting blocks, and there is magnetic attraction between the adsorption magnetic blocks and the outer sleeve.

[0012] Preferably, the mounting block forms a rotating structure with the mounting roller through a driving motor fixedly mounted in the middle position inside the mounting roller, and a first stirring blade for stirring the sodium hydroxide solution is fixedly mounted outside the rotating shaft of the mounting block.

[0013] Preferably, discharge pipes with solenoid valves are fixedly installed at the left and right ends of the installation roller, and the discharge pipes and the installation roller are connected to each other.

[0014] Preferably, a laterally arranged support frame is fixedly mounted above the mounting frame, and a detection camera for observing the situation inside the water tank is fixedly mounted on the lower surface of the support frame.

[0015] Preferably, a cleaning nozzle corresponding to the position of the detection camera is fixedly installed on the lower surface of the support frame, and the cleaning nozzle is connected to the inflation airbag through a connecting pipe.

[0016] Preferably, the airbag is fixedly mounted on the lower surface of the mounting frame, and the airbag corresponds to the upper and lower positions of the extrusion plates fixedly mounted on the upper ends of the left and right sides of the water tank.

[0017] Preferably, a relay box is fixedly installed on the lower surface of the support frame, and the relay box is communicated with the connecting pipe, and a second heater and drying cotton are fixedly installed inside the relay box.

[0018] Compared with the prior art, the invention has the following beneficial effects: the stainless steel welded coil air tightness detector adopts a new structural design, and its specific contents are as follows: 1. Install the stainless steel coil to be tested on the outside of the installation roller, and then put the installation roller and the stainless steel coil into the water tank through the telescopic cylinder. Then use the delivery pump to deliver the nitric oxide gas in the gas tank to the stainless steel coil and control the pressure. If the stainless steel coil leaks, the nitric oxide gas will flow into the water tank and react with water to form an acidic solution. The acidic solution will change the color of the litmus indicator in the water tank, and the color change will allow the staff to observe better. Furthermore, an alkaline sodium hydroxide solution is stored inside the installation roller. After discoloration occurs, a portion of the sodium hydroxide solution in the installation roller is discharged through the discharge pipe to neutralize the acid generated in the water tank, thereby returning the solution in the water tank to neutrality. At the same time, the second stirring blade inside the water tank rotates and stirs to accelerate the mixing speed.

[0019] 2. Turn on the drive motor in the middle of the installation roller and use the drive motor to drive the installation block to rotate. At this time, the adsorption magnetic blocks at the upper and lower ends of the installation block and the outer sleeve outside the installation roller are magnetically adsorbed to each other, so the outer sleeve will rotate synchronously during the rotation of the installation block, so that the outer sleeve drives the stainless steel coil to rotate under the action of the fixed sponge, and rotates the bottom of the stainless steel coil to the top, avoiding obstruction and affecting observation during detection; Furthermore, during the rotation of the mounting block, the first stirring blade rotates simultaneously, and the sodium hydroxide solution inside the mounting roller is stirred by the first stirring blade to prevent its precipitation from affecting the concentration.

[0020] 3. During the inspection process, the inspection camera under the support frame is used to take real-time photos of the internal conditions of the water tank and transmit the images to the monitoring computer, so that the staff can observe remotely, improving the convenience and comfort of work; Furthermore, after the telescopic cylinder drives the mounting frame to move downward, the airbag installed below the mounting frame and the extrusion plate on the upper edge of the water tank are squeezed against each other, and the air in the airbag is ejected from the cleaning nozzle through the connecting pipe, and the dust on the surface of the detection camera is cleaned by the airflow ejected from the cleaning nozzle; Furthermore, the connecting pipe is connected to the relay box, and the second heater in the relay box can be used to heat the air, thereby heating the detection camera when it is sprayed out, thereby preventing the hot air in the water tank from rising and forming water mist on the surface of the detection camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the water storage tank of the present invention; Figure 3 This is a schematic diagram of the internal structure of the gas storage box of the present invention; Figure 4 This is a schematic diagram of the internal structure of the mounting roller of the present invention; Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle; Figure 6 This is a schematic diagram of the structure of the first stirring blade of the present invention; Figure 7 This is a schematic diagram of the support structure of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in the middle; Fig. 9 This is a schematic diagram of the structure of the detection camera installation position of the present invention; Fig.10 It is a schematic diagram of the internal structure of the relay box of the present invention.

[0022] In the figure: 1. support base; 2. water storage tank; 201. water injection pipe; 202. extrusion plate; 3. control panel; 4. telescopic cylinder; 5. mounting frame; 6. mounting roller; 7. stainless steel coil; 8. air storage tank; 9. delivery pipe; 10. sealing joint; 11. discharge pipe; 12. outer sleeve; 13. fixed sponge; 14. drive motor; 15. mounting block; 16. adsorption magnetic block; 17. first stirring blade; 18. delivery pump; 19. pressure gauge; 20. first heater; 21. second stirring blade; 22. filling block; 23. support frame; 24. detection camera; 25. cleaning nozzle; 26. connecting pipe; 27. air bag; 28. relay box; 2801. second heater; 2802. drying cotton. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figure 1-Figure 3 In order to solve the problem of unclear observation of traditional devices, this embodiment provides the following technical solutions, which specifically disclose: a support base 1 placed horizontally on the ground, a water tank 2 is fixedly installed in the middle position of the upper surface of the support base 1, and a control panel 3 is fixedly installed on the front outer surface of the water tank 2, and a water injection pipe 201 is fixedly installed at the right end of the front side of the water tank 2, litmus acid-base indicator is added to the water inside the water tank 2, telescopic cylinders 4 fixedly installed with the support base 1 are arranged on the left and right sides of the water tank 2, and a mounting frame 5 is fixedly installed on the top of the telescopic cylinder 4, and a horizontally arranged mounting roller 6 is placed at the lower end of the mounting frame 5, and a stainless steel coil 7 that needs to be tested for air tightness is arranged on the outside of the mounting roller 6, and the left and right ends of the stainless steel coil 7 are blocked by sealing joints 10, An air storage tank 8 is fixedly installed on the left side of the water tank 2, and nitric oxide gas is stored in the air storage tank 8. A delivery pump 18 is fixedly installed on the upper surface of the air storage tank 8, and the delivery pump 18 is connected to the left sealing joint 10 through a delivery pipe 9. The mounting frame 5 forms a lifting structure with the water tank 2 through a telescopic cylinder 4, and a second stirring blade 21 is rotatably installed inside the water tank 2, and filling blocks 22 for raising the water level are fixedly installed at the four corners of the water tank 2, a first heater 20 is fixedly installed inside the air storage tank 8, and a pressure gauge 19 for detecting pressure changes is fixedly installed on the bottom end of the delivery pipe 9, an outer sleeve 12 is installed on the outside of the mounting roller 6, and a fixed sponge 13 for squeezing and fixing the stainless steel coil 7 is fixedly installed on the outer surface of the outer sleeve 12.

[0025] When using the device, firstly, use the water injection pipe 201 to inject clean water into the water storage tank 2, then add a proper amount of litmus indicator, install the stainless steel coil 7 to be tested on the outside of the installation roller 6 and fix it by the squeezing effect of the fixing sponge 13, then place the installation roller 6 on the installation frame 5, turn on the telescopic cylinder 4, use the telescopic cylinder 4 to drive the installation frame 5 to move downward to put the installation roller 6 into the water storage tank 2 (the water surface covers the stainless steel coil 7), then turn on the delivery pump 18, and under the action of the delivery pump 18, the nitric oxide gas in the gas storage tank 8 is delivered to the stainless steel coil 7 through the delivery pipe 9 and the sealing joint 10 (the first heater 20 in the gas storage tank 8 is turned on when needed). The gas is heated to detect the air tightness of the stainless steel coil 7 under high temperature conditions), and the pressure in the delivery pipe 9 is detected by a pressure gauge 19. When the pressure reaches the specified value, the gas delivery is stopped and maintained for a period of time. At this time, the air tightness is judged by observing the changes in the water tank 2 (if the air tightness is good, there will be no changes in the water tank 2. If the stainless steel coil 7 leaks, the nitric oxide gas leaks out and reacts with the water in the water tank 2 to generate acidic substances, causing the pH value of the water in the water tank 2 to drop. At this time, the litmus solution will change color. The staff judges the air tightness by observing the color change of the liquid, which is more obvious than the traditional observation of bubbles and will not be missed).

[0026] Example 2: Please refer to Figure 4-Figure 5 In order to solve the problem of obstruction during observation by traditional devices, the present embodiment provides the following technical solutions, which specifically disclose: an alkaline sodium hydroxide solution is filled inside the mounting roller 6, and a magnetic attraction mechanism for driving the outer sleeve 12 to reciprocate is arranged inside the mounting roller 6, and the magnetic attraction mechanism includes mounting blocks 15 installed at the left and right ends of the mounting roller 6 and adsorption magnetic blocks 16 fixedly installed at the upper and lower ends of the mounting block 15, and there is magnetic adsorption between the adsorption magnetic block 16 and the outer sleeve 12, and the mounting block 15 forms a rotating structure with the mounting roller 6 through a driving motor 14 fixedly installed at the middle position inside the mounting roller 6, and a first stirring blade 17 for stirring the sodium hydroxide solution is fixedly installed on the outside of the rotating shaft of the mounting block 15, and a discharge pipe 11 with an electromagnetic valve is fixedly installed at the left and right ends of the mounting roller 6, and the discharge pipe 11 and the mounting roller 6 are connected to each other.

[0027] During the detection process, the drive motor 14 in the middle position inside the installation roller 6 is turned on, and the drive motor 14 is used to drive the installation block 15 to rotate back and forth periodically (the rotation amplitude is half a circle), so that the installation block 15 drives the adsorption magnetic blocks 16 at its upper and lower ends to rotate synchronously (the adsorption magnetic blocks 16 and the outer sleeve 12 are magnetically adsorbed to each other), so that the outer sleeve 12 is driven to rotate synchronously under the action of the adsorption magnetic blocks 16, so that the outer sleeve 12 drives the stainless steel coil 7 to rotate by using the external fixed sponge 13, and rotates its lower surface upward to avoid being blocked during observation. During the rotation of the installation block 15, the first stirring blade 17 is driven to rotate synchronously, so that the first stirring blade 17 stirs the sodium hydroxide solution inside the installation roller 6 to prevent it from precipitating. When gas leakage is detected (that is, the solution in the water storage tank 2 changes color), the solenoid valve of the discharge pipe 11 is opened to discharge the sodium hydroxide solution to form acid-base neutralization (at this time, the second stirring blade 21 rotates to accelerate the mixing reaction speed), so that the solution in the water storage tank 2 returns to a neutral state again to ensure normal use next time.

[0028] Example 3: Please refer to Figure 7-10 In order to solve the problem that traditional devices cannot be observed remotely, this embodiment provides the following technical solutions, which specifically disclose: a laterally arranged support frame 23 is fixedly installed above the mounting frame 5, and a detection camera 24 for observing the situation in the water tank 2 is fixedly installed on the lower surface of the support frame 23; a cleaning nozzle 25 corresponding to the position of the detection camera 24 is fixedly installed on the lower surface of the support frame 23, and the cleaning nozzle 25 is communicated with the airbag 27 through the connecting pipe 26; the airbag 27 is fixedly installed on the lower surface of the mounting frame 5, and the upper and lower positions of the airbag 27 and the extrusion plate 202 fixedly installed on the upper ends of the left and right sides of the water tank 2 correspond to each other; a relay box 28 is fixedly installed on the lower surface of the support frame 23, and the relay box 28 is communicated with the connecting pipe 26, and a second heater 2801 and a drying cotton 2802 are fixedly installed inside the relay box 28.

[0029] During the inspection process, the staff can remotely observe the images transmitted by the inspection camera 24 in the support frame 23, thereby improving the comfort of the staff. When the telescopic cylinder 4 drives the mounting frame 5 to move downward, the air blowing bag 27 on the lower surface of the mounting frame 5 and the extrusion plate 202 on the upper edge of the water tank 2 are squeezed against each other. At this time, the air in the air blowing bag 27 is ejected from the cleaning nozzle 25 through the connecting pipe 26, so as to achieve the purpose of cleaning the dust on the surface of the inspection camera 24. When necessary (i.e. when the temperature is low), turn on the second heater 2801 inside the relay box 28, use the second heater 2801 to heat the air, use the drying cotton 2802 after heating, and finally use the dry air to heat the inspection camera 24, so as to avoid the hot air from the water tank 2 contacting the inspection camera 24 to form water mist when in use.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stainless steel welded coil air tightness detector, comprising a support base (1) placed horizontally on the ground, a water tank (2) fixedly mounted in the middle of the upper surface of the support base (1), a control panel (3) fixedly mounted on the front outer surface of the water tank (2), and a water injection pipe (201) fixedly mounted at the front right end of the water tank (2), characterized in that: A litmus acid-base indicator is added to the water inside the water storage tank (2), and telescopic cylinders (4) fixedly mounted on the support base (1) are arranged on the left and right sides of the water storage tank (2), and a mounting frame (5) is fixedly mounted on the top of the telescopic cylinder (4), and a transversely arranged mounting roller (6) is placed at the lower end of the mounting frame (5), and a stainless steel coil (7) to be tested for air tightness is arranged outside the mounting roller (6), and the left and right ends of the stainless steel coil (7) are sealed by sealing joints (10); An air storage box (8) is fixedly mounted on the left side of the water storage box (2), and the air storage box (8) stores nitric oxide gas inside. A delivery pump (18) is fixedly mounted on the upper surface of the air storage box (8), and the delivery pump (18) is connected to the left sealing joint (10) via a delivery pipe (9); An outer sleeve (12) is installed on the outside of the installation roller (6), and a fixed sponge (13) is fixedly installed on the outer surface of the outer sleeve (12) for squeezing and fixing the stainless steel coil (7), and an alkaline sodium hydroxide solution is filled inside the installation roller (6). A magnetic attraction mechanism is arranged inside the installation roller (6) for driving the outer sleeve (12) to reciprocate.

2. The stainless steel welded coil air tightness detector according to claim 1, characterized in that: The mounting frame (5) forms a lifting structure with the water tank (2) via a telescopic cylinder (4), a second stirring blade (21) is rotatably mounted inside the water tank (2), and filling blocks (22) for raising the water level are fixedly mounted at the four corners inside the water tank (2).

3. The stainless steel welded coil air tightness detector according to claim 1, characterized in that: A first heater (20) is fixedly installed inside the gas storage box (8), and a pressure gauge (19) for detecting pressure changes is fixedly installed outside the bottom end of the delivery pipe (9).

4. The stainless steel welded coil air tightness detector according to claim 1, characterized in that: The magnetic attraction mechanism comprises a mounting block (15) mounted on the left and right ends of the mounting roller (6) and an adsorption magnetic block (16) fixedly mounted on the upper and lower ends of the mounting block (15), and the adsorption magnetic block (16) is magnetically adsorbed to the outer sleeve (12).

5. The stainless steel welded coil air tightness detector according to claim 4, characterized in that: The mounting block (15) forms a rotating structure with the mounting roller (6) through a driving motor (14) fixedly mounted in the middle position inside the mounting roller (6), and a first stirring blade (17) for stirring the sodium hydroxide solution is fixedly mounted outside the rotating shaft of the mounting block (15).

6. The stainless steel welded coil air tightness detector according to claim 5, characterized in that: Discharge pipes (11) with electromagnetic valves are fixedly mounted on the left and right ends of the installation roller (6), and the discharge pipe (11) and the installation roller (6) are in communication with each other.

7. The stainless steel welded coil air tightness detector according to claim 1, characterized in that: A transversely arranged support frame (23) is fixedly mounted above the mounting frame (5), and a detection camera (24) for observing the situation inside the water storage tank (2) is fixedly mounted on the lower surface of the support frame (23).

8. The stainless steel welded coil air tightness detector according to claim 7, characterized in that: A cleaning nozzle (25) corresponding to the position of the detection camera (24) is fixedly mounted on the lower surface of the support frame (23), and the cleaning nozzle (25) is connected to the airbag (27) via a connecting pipe (26).

9. The stainless steel welded coil air tightness detector according to claim 8, characterized in that: The air blast bag (27) is fixedly mounted on the lower surface of the mounting frame (5), and the air blast bag (27) and the extrusion plates (202) fixedly mounted on the upper ends of the left and right sides of the water storage tank (2) correspond to each other in upper and lower positions.

10. The stainless steel welded coil air tightness detector according to claim 9, characterized in that: A relay box (28) is fixedly mounted on the lower surface of the support frame (23), the relay box (28) and the connecting pipe (26) are in communication with each other, and a second heater (2801) and drying cotton (2802) are fixedly mounted inside the relay box (28).

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