Liquefied gas storage tank sealing performance detection equipment

Abstract

The invention provides liquid gas storage tank sealing performance detection equipment which comprises a supporting frame, a rotatable connecting block is arranged on the inner side of the supporting frame, a fixing pipe with one end capable of being inserted into a gas tank opening is fixed to the connecting block, and a connecting pipe fitting used for conveying detection gas into the fixing pipe is arranged in the connecting block; a liftable moving plate is arranged on the inner side of the supporting frame, a sleeve located above the connecting block is fixed to the bottom of the moving plate, a liftable round shell is arranged in the sleeve, round holes are formed in the top and the bottom of the round shell, fixing rings are fixed to the top and the bottom of the round shell, and inflation strips which are annularly arranged and can be inflated and expanded are arranged in the fixing rings. According to the invention, all-directional sealing performance detection can be carried out on the liquefied gas storage tank, and leakage parts on the surface of the gas storage tank can be limited in a very small range, so that subsequent workers can accurately find leakage points, the detection efficiency of the liquefied gas storage tank is improved, and the detection precision of the liquefied gas storage tank is improved. And the situation that the workshop environment is humid due to the fact that the ground is wetted is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a liquefied gas tank sealing detection equipment. Background Art

[0002] A liquefied gas tank is a storage tank for storing liquefied gas. When there is liquefied gas inside, the pressure is very high. Slight improper operation may cause an explosion, and it belongs to special equipment; since the liquefied gas tank belongs to special equipment, after the gas tank of the liquefied gas tank is produced, its sealing performance also needs to be detected to ensure that the sealing of the liquefied gas tank is intact, and then subsequent processing such as welding the base at the bottom of the gas tank and welding the protective cover at the top of the gas tank is carried out;

[0003] However, when the current liquefied gas tanks are subjected to sealing detection, most of them are to put the liquefied gas tanks into water and then judge whether there is leakage in the liquefied gas tanks by observing whether there are bubbles in the water; and for the method of putting the liquefied gas tanks into water for detection, when there is a leakage point in the liquefied gas tank, bubbles will be generated in the water, but the leakage point cannot be marked. Therefore, after the liquefied gas tank is taken out, it is necessary to manually perform a full-range secondary detection on the liquefied gas tank with leakage points to find the leakage point and judge the cause of the leakage point, resulting in low detection efficiency; and after the liquefied gas tank is taken out after being detected in water, there is moisture on the surface of the liquefied gas tank, which will randomly drip on the ground as the liquefied gas tank is transported, causing the ground to be wet and making it easy for the staff to slip. Summary of the Invention

[0004] The present invention discloses a liquefied gas tank sealing detection equipment, which solves the problems that when the liquefied gas tank is put into water for detection, the leakage point cannot be marked, a full-range secondary detection is still required, the detection efficiency is low, and the moisture on the surface of the liquefied gas tank will randomly drip on the ground.

[0005] To solve the above technical problems, the present invention specifically adopts the following technical solutions:

[0006] A liquefied gas tank sealing detection equipment includes a support frame. Inside the support frame, there is a rotatable connection block. A fixed pipe whose one end can be inserted into the tank opening of the gas tank is fixed on the connection block. Inside the connection block, there is a connection pipe fitting for conveying detection gas into the fixed pipe; inside the support frame, there is a movable plate that can be lifted. At the bottom of the movable plate, there is a sleeve located above the connection block. Inside the sleeve, there is a circular shell that can be lifted. Circular holes are opened at the top and bottom of the circular shell and fixed rings are fixed. Inside the fixed rings, there is an inflatable strip arranged in a ring shape and capable of being inflated and expanded; inside the circular shell, there is a gas detector and an electric telescopic rod located between the two fixed rings. The telescopic end of the electric telescopic rod is fixed with a marking pen.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] Place the gas cylinder upside down on top of the connecting block, insert the fixed pipe into the mouth of the gas cylinder, and then convey the inert gas for detection into the fixed pipe through the connecting pipe fittings so that the inert gas enters the gas cylinder. Then move the sleeve downward to cover the gas cylinder. At the same time, the gas cylinder is located inside the two inflation strips. When the inflation strips inflate and expand, the two inflation strips can closely adhere to the outer wall of the gas cylinder, forming a sealed space inside the circular shell. At this time, the gas detector can detect whether there is inert gas inside the circular shell to determine whether there is a leakage point in the part of the gas cylinder located inside the circular shell. When the gas detector detects the inert gas, the electric telescopic rod is activated, and after the marking pen contacts the surface of the gas cylinder, a mark is left on the surface of the gas cylinder, so that subsequent staff only need to detect the parts near the marked points, and there is no need to detect the entire gas cylinder. Through the repeated inflation, expansion and contraction of the two inflation strips, and combined with the up and down movement of the circular shell, precise detection of all parts of the gas cylinder can be completed. The present invention can perform all-round sealing detection on the liquefied gas cylinder, and can limit the parts with leakage on the surface of the gas cylinder to a very small range, so as to facilitate subsequent staff to accurately find the leakage points, improve the detection efficiency of the liquefied gas cylinder, and there will be no situation of wetting the ground and making the working workshop environment humid. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural view of the front view of the present invention;

[0010] Figure 2 is a schematic structural view of the cross-section of the support frame of the present invention;

[0011] Figure 3 is a schematic structural view of the connecting block of the present invention;

[0012] Figure 4 is a schematic structural view of the side view of the bearing plate of the present invention;

[0013] Figure 5 is Figure 4 the enlarged structural view of part A of

[0014] Figure 6 is a schematic structural view of the cross-section of the sleeve of the present invention;

[0015] Figure 7 is a schematic structural view of the cross-section of the circular shell of the present invention;

[0016] Figure 8 is a schematic structural view of the top view of the fixed ring of the present invention;

[0017] Figure 9 is a schematic structural view of the top view of the material taking rack of the present invention;

[0018] Figure 10 is a schematic structural view of the back side of the support frame of the present invention.

[0019] In the figure: 1, support frame; 2, connecting block; 21, connecting column; 22, second motor; 23, storage battery; 24, fixed pipe; 25, annular plate; 26, connecting shell; 27, short pipe; 3, first automatic telescopic rod; 31, bearing plate; 32, fixed plate; 33, spring; 34, extrusion plate; 35, first electromagnet; 4, second automatic telescopic rod; 41, abutting plate; 5, moving plate; 51, sleeve; 52, telescopic cylinder; 53, first motor; 54, lead screw; 55, limiting rod; 56, lifting ring; 57, hydraulic rod; 6, round shell; 61, fixed ring; 62, inflatable strip; 63, air inflating pump; 64, air extraction pump; 65, vertical plate; 66, gas detector; 67, electric telescopic rod; 68, marker pen; 69, exhaust fan; 7, long pipe; 71, exhaust pipe; 72, air extraction pipe; 73, return pipe; 74, metal hose; 75, connector; 76, connecting plate; 77, third automatic telescopic rod; 78, fixed rod; 8, fixed frame; 81, moving strip; 82, conveying unit; 83, fourth automatic telescopic rod; 84, material taking frame; 85, fifth automatic telescopic rod; 86, moving block; 87, second electromagnet; 88, rubber column; 9, gas tank. Detailed implementation manners

[0020] The following will describe in detail the specific content of the present invention in conjunction with the accompanying drawings and embodiments.

[0021] Such as Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown in the figure, the present invention provides a sealing detection device for a liquefied gas tank, which includes a support frame 1. Inside the support frame 1, there is a rotatable connection block 2. A fixed pipe 24 with one end that can be inserted into the tank opening of the gas tank 9 is fixed on the connection block 2. Inside the connection block 2, there is a connection pipe fitting for conveying detection gas into the fixed pipe 24; Inside the support frame 1, there is a movable plate 5 that can be lifted and lowered. At the bottom of the movable plate 5, there is a sleeve 51 located above the connection block 2. Inside the sleeve 51, there is a circular shell 6 that can be lifted and lowered. Circular holes are opened at the top and bottom of the circular shell 6, and fixed rings 61 are fixed. Inside the fixed rings 61, there are inflatable strips 62 arranged in a ring shape and capable of being inflated and expanded; Inside the circular shell 6, there are a gas detector 66 and an electric telescopic rod 67 located between the two fixed rings 61. The telescopic end of the electric telescopic rod 67 is fixed with a marking pen 68. Place the gas tank 9 upside down on the connection block 2, insert the fixed pipe 24 into the gas tank 9 through the tank opening of the gas tank 9, and then convey inert gas for detection (inert gas can be selected as argon, etc., and the gas detector can use an online argon detector: HR100L-Ar. When other inert gases, such as helium or nitrogen, are selected, the corresponding detectors can be selected in the same way) into the fixed pipe 24 through the connection pipe fitting, so that the inert gas enters the gas tank 9; Then the circular shell 6 moves downward to cover the gas tank 9, so that the gas tank 9 is located between the two inflatable strips 62 (the inflatable strips 62 are strip-shaped, one end is fixed on the inner wall of the fixed ring 61. After the inflatable strip 62 is rolled into a ring shape, the other end is fixed on its own inner side, such as Figure 8Between those shown in [Figure 0], the inflatable strip 62 is then inflated and expanded, and can be closely attached to the outer wall of the gas cylinder 9, forming a sealed space within the circular shell 6. At this time, the gas detector 66 can inspect the space to see if there is any leaking inert gas, so as to determine whether there is a leakage point in the part of the gas cylinder 9 between the two inflatable strips 62; when it is necessary to detect other parts of the gas cylinder 9, the inflatable strip 62 can be deflated, and then the circular shell 6 can be moved downward or upward to cover other parts of the gas cylinder 9, and then the inflatable strip 62 is inflated, and the airtightness of other parts of the gas cylinder 9 can be continuously detected. Repeating the above operations subsequently can perform a full-range airtightness detection on the gas cylinder 9; when it is necessary to detect the airtightness of the top of the gas cylinder 9, the top of the circular shell 6 can be made to contact the top inside the sleeve 51 to cover the top of the gas cylinder 9. At this time, only the lower inflatable strip 62 needs to be inflated, and the upper inflatable strip 62 is not inflated, and the top of the gas cylinder 9 is sealed within the circular shell 6, then the airtightness of the top of the gas cylinder 9 can be detected; when it is necessary to detect the airtightness of the part of the gas cylinder 9 near the tank opening, the bottom of the circular shell 6 can be made to contact the top of the connecting block 2, and the upper inflatable strip 62 is inflated while the lower inflatable strip 62 is not inflated, then the part of the gas cylinder 9 near the tank opening can be sealed within the circular shell 6, and then the airtightness detection is carried out; when there is a leakage point on the gas cylinder 9, resulting in the leakage of inert gas into the circular shell 6, the telescopic end of the electric telescopic rod 67 drives the marker pen 68 to approach the gas cylinder 9. After the marker pen 68 contacts the gas cylinder 9, it can mark on the gas cylinder 9, so that subsequent staff only need to detect the part of the surface of the gas cylinder 9 near the marked point to find out the leakage point; and through the inflation of the inflatable strip 62, the airtightness of gas cylinders 9 of different volumes can be detected, improving the applicable range of this equipment.

[0022] Such as Figure 2 , Figure 3 and Figure 4As shown, a first automatic telescopic rod 3 and a second automatic telescopic rod 4 are fixed on the connection block 2. The telescopic ends of the first automatic telescopic rod 3 and the second automatic telescopic rod 4 are respectively fixed with a bearing plate 31 and a pressing plate 41 that are slidably connected to the connection block 2. The fixed pipe 24 is located between the bearing plate 31 and the pressing plate 41; a first electromagnet 35 is embedded on the side of the bearing plate 31 close to the pressing plate 41. When the gas cylinder 9 is being loaded or unloaded, the telescopic ends of the first automatic telescopic rod 3 (the first automatic telescopic rod 3 adopts a three-section telescopic rod) and the second automatic telescopic rod 4 can be operated to make the bearing plate 31 and the pressing plate 41 approach each other, clamping and fixing the gas cylinder 9. At the same time, after the first electromagnet 35 is energized to generate a magnetic force, the gas cylinder 9 is adsorbed, further increasing the stability of the gas cylinder 9; subsequently, after the connection block 2 rotates, the position of the gas cylinder 9 can be changed to facilitate the staff to remove the gas cylinder 9 or re-place the gas cylinder 9 to be detected. When the gas cylinder 9 is being subjected to a sealing test, the bearing plate 31 and the pressing plate 41 move away from each other, which will not affect the normal descent of the sleeve 51.

[0023] As Figure 2 , Figure 3 and Figure 4 shown, a set of fixed pipes 24 are provided on the four large surfaces of the connection block 2, and a set of first electromagnets 35 are provided on the bearing plate 31; fixing plates 32 fixed on the bearing plate 31 are provided on both sides of the first electromagnet 35. Spring 33 is fixed on the opposite surfaces of the two fixing plates 32, and the other end of the spring 33 is fixed with a pressing plate 34 that is slidably connected to the bearing plate 31. The four large surfaces of the connection block 2 refer to the left, right, up, and down of the connection block 2 (in the orientation shown in Figure 1 ), and correspondingly, a first automatic telescopic rod 3 and a second automatic telescopic rod 4 are also provided on the four large surfaces of the connection block 2. And the number of the first automatic telescopic rod 3 and the second automatic telescopic rod 4 on one large surface of the connection block 2 is at least two. Two first automatic telescopic rods 3 control the operation of one bearing plate 31, and two second automatic telescopic rods 4 control the operation of one pressing plate 41; the staff can place the gas cylinder 9 on one side (the right side, in Figure 1Between two corresponding pressing plates 34 in the orientation shown in [description of the figure], the spring 33 is compressed, playing a role in fixing the gas cylinder 9. A sponge pad is provided on the pressing plate 34 to protect the surface of the gas cylinder 9. When the gas cylinder 9 is placed, it comes into contact with the first electromagnet 35 located between the two pressing plates 34. After the first electromagnet 35 is energized, it generates a magnetic force to adsorb the gas cylinder 9, completing the fixation of the gas cylinder 9. The inner diameter of the mouth of the gas cylinder 9 is larger than the outer diameter of the fixed pipe 24. When placing the gas cylinder 9, it will not cause friction between the gas cylinder 9 and the first electromagnet 35. After the gas cylinder 9 is placed, it is slightly moved downward to contact the first electromagnet 35, facilitating the placement of the gas cylinder 9. Repeat the above operation. After the subsequent gas cylinders 9 are placed, the second automatic telescopic rod 4 can be driven to move the abutting plate 41. The abutting plate 41 cooperates with the first electromagnet 35 on the bearing plate 31 to clamp and fix the gas cylinder 9, so that after the connecting block 2 rotates counterclockwise by 90°, the gas cylinder 9 is in a vertical state. A set of sleeves 51 is also provided at the bottom of the moving plate 5, so that several gas cylinders 9 can be detected at one time, improving the detection efficiency of the gas cylinders 9.

[0024] As Figure 2 、 Figure 6 and Figure 7As shown in the figure, a first motor 53 is fixed on the sleeve 51. A lead screw 54 located inside the sleeve 51 is fixed on the rotating shaft of the first motor 53, and a limiting rod 55 is fixed inside the sleeve 51; a lifting ring 56 fixed to the circular shell 6 is slidably connected inside the sleeve 51. The lead screw 54 is threadedly connected to the lifting ring 56, and the limiting rod 55 passes through the lifting ring 56; an air inflation pump 63 and an air extraction pump 64 communicated with the air inflation strip 62 are fixed inside the circular shell 6. A telescopic cylinder 52 whose telescopic end extends to the inside of the air inflation strip 62 located above penetrates through the top of the sleeve 51, and an air extraction fan 69 is fixed inside the circular shell 6. Positioning blocks connected to the inner wall of the sleeve 51 are respectively fixed at the bottoms of the lead screw 54 and the limiting rod 55 to facilitate enhancing the firmness of the lead screw 54 and the limiting rod 55; the air intake end of the air inflation pump 63 penetrates through the sleeve 51, and the air inflation end of the air inflation pump 63 is communicated with the two air inflation strips 62 through two air inflation pipes respectively. Solenoid valves are respectively fixed on the two air inflation pipes to facilitate only opening one solenoid valve to inflate one air inflation strip 62; the exhaust end of the air extraction pump 64 penetrates through the sleeve 51, and the air extraction end of the air extraction pump 64 is communicated with the two air inflation strips 62 through two air extraction pipes respectively. Solenoid valves are respectively fixed on the two air extraction pipes to facilitate only opening one solenoid valve to extract the air inside one air inflation strip 62; when the gas cylinder 9 is being detected, when the gas cylinder 9 is being detected, the circular shell 6 can be moved downward to contact the connecting block 2 to cover the gas cylinder 9 to form a sealed space, and the air inflation strip 62 does not inflate and expand. At this time, the gas detector 66 can detect whether there is inert gas inside the circular shell 6. When no inert gas is detected, it means that there is no leakage point in the gas cylinder 9, improving the detection efficiency of the gas cylinder 9, that is, there is no need to divide the gas cylinder 9 into several parts for detection; when there is inert gas inside the circular shell 6 and sectional detection of the gas cylinder 9 is required, after the two air inflation strips 62 expand, the air extraction fan 69 extracts air. The air exhaust end of the air extraction fan 69 penetrates through the top of the sleeve 51 and is slidably connected to the sleeve 51. An air inlet pipe that penetrates through the top of the sleeve 51 and is slidably connected to the sleeve 51 is communicated with the top of the circular shell 6. After the air extraction fan 69 is started, it is convenient to extract the mixed inert gas inside the circular shell 6 to avoid misdetection; after the first motor 53 is started, the lead screw 54 can be rotated to move the lifting ring 56 upward or downward. The first motor 53 uses a servo motor.

[0025] As Figure 7 shown in the figure, two vertically arranged plates 65 that are symmetric left and right are fixed inside the circular shell 6. The number of gas detectors 66 and electric telescopic rods 67 is two respectively. The opposite surfaces of the two vertically arranged plates 65 are respectively fixed to the two gas detectors 66 and the two electric telescopic rods 67, and the two electric telescopic rods 67 are arranged in a vertically staggered manner. The arrangement of the two gas detectors 66 can improve the detection efficiency and detection range; the two electric telescopic rods 67 are arranged in a vertically staggered manner, and the marking pen 68 on the left is close to the bottom of the fixing ring 61 located above, and the marking pen 68 on the right is close to the top of the fixing ring 61 located below (inFigure 1 In the orientation shown, when an inert gas is detected, after the two marking pens 68 mark the gas cylinder 9 simultaneously, the leakage point can be restricted between the two marking points, facilitating subsequent search for the leakage point by the staff.

[0026] As Figure 2 and Figure 5 shown, a perforation extending to the other side is formed on one side of the connecting block 2. A set of connecting shells 26 distributed in an annular array are fixed in the perforation. A short pipe 27 is communicated with the connecting shell 26; several groups of fixed pipes 24 are respectively communicated with a set of connecting shells 26, and an annular plate 25 located outside the connecting block 2 is fixed on the fixed pipe 24. After the mouth of the gas cylinder 9 is sleeved on the fixed pipe 24, the annular plate 25 can abut against the mouth of the gas cylinder 9, playing a role in sealing and bearing the mouth of the gas cylinder 9; the connecting pipe fittings can convey the inert gas into one connecting shell 26 through the short pipe 27, and then the inert gas in one connecting shell 26 respectively enters a set of gas cylinders 9 through a set of fixed pipes 24 on one large surface of the connecting block 2; the telescopic cylinder 52 includes a cylinder body and a compression spring fixed in the cylinder body. The other end of the compression spring is fixed with a moving rod extending outside the cylinder body and slidably connected with the cylinder body. When the bottom of the sleeve 51 contacts the top of the connecting block 2, the sleeve 51 covers the gas cylinder 9, and the top of the gas cylinder 9 abuts the moving rod upward, causing the moving rod to compress the compression spring and move towards the inside of the cylinder body, so as to press and fix the gas cylinder 9 and increase the sealing performance between the mouth of the gas cylinder 9 and the annular plate 25.

[0027] As Figure 3 , Figure 5 and Figure 10 shown, the connecting pipe fittings include a long pipe 7 located in the perforation of the connecting block 2. An exhaust pipe 71, a suction pipe 72 and a return pipe 73 are fixed in the long pipe 7. One ends of the exhaust pipe 71, the suction pipe 72 and the return pipe 73 extend outside the connecting block 2. One ends of the exhaust pipe 71, the suction pipe 72 and the return pipe 73 located inside the connecting block 2 are respectively communicated with a metal hose 74. The other end of the metal hose 74 is communicated with a connector 75. A connecting plate 76 is fixed on the connector 75. A third automatic telescopic rod 77 for driving the connecting plate 76 to move is provided on the long pipe 7; one end of the long pipe 7 located outside the connecting block 2 is fixed with a fixing rod 78 connected to the outer wall of the support frame 1. The exhaust pipe 71 corresponds to the top of the connecting block 2, and the suction pipe 72 and the return pipe 73 respectively correspond to the right side and the left side of the connecting block 2 (in the orientation Figure 1In the orientation shown, the number of the third automatic telescopic rods 77 is three, and the three third automatic telescopic rods 77 are respectively fixed to the three connecting plates 76; after the gas cylinder 9 is fixed on the right side of the connecting block 2, the corresponding third automatic telescopic rod 77 is activated, so that the connector 75 connected to the air extraction pipe 72 through the metal hose 74 moves along with the connecting plate 76, and the connector 75 is inserted into the short pipe 27 on the right side inside the perforation of the connecting block 2. One end of the air extraction pipe 72 located outside the connecting block 2 is communicated with an external air extraction device, so as to extract the air in the gas cylinder 9 and make the inside of the gas cylinder 9 in a negative pressure state; after the connecting block 2 rotates counterclockwise by 90°, the corresponding third automatic telescopic rod 77 is activated, so that the connector 75 connected to the exhaust pipe 71 through the metal hose 74 moves along with the connecting plate 76. One end of the exhaust pipe 71 located outside the connecting block 2 is communicated with a storage tank storing inert gas, so that inert gas can be conveyed into the gas cylinder 9 to start the airtightness detection of the gas cylinder 9; after the airtightness detection of the gas cylinder 9 is completed, the connecting block 2 continues to rotate counterclockwise by 90°, and the corresponding third automatic telescopic rod 77 is activated, so that the connector 75 connected to the return pipe 73 through the metal hose 74 moves along with the connecting plate 76. One end of the return pipe 73 located outside the connecting block 2 is communicated with an external device for recycling inert gas, so as to recycle the used inert gas and save costs; a solenoid valve is installed on the short pipe 27, so that after the inert gas in the gas cylinder 9 is extracted and recycled, the solenoid valve on the corresponding short pipe 27 can be opened to allow external air to enter; the fixed rod 78 can fix the long pipe 7.

[0028] As Figure 1 , Figure 2 , Figure 3 and Figure 10 shown, connecting columns 21 rotatably connected to the inner wall of the support frame 1 are respectively fixed to both sides of the connecting block 2. A second motor 22 with a rotating shaft fixed to one of the connecting columns 21 through a connecting seat is fixed on the support frame 1. One end of the long pipe 7 close to the fixed rod 78 penetrates through one of the connecting columns 21 away from the second motor 22 and is rotatably connected to the connecting column 21. A storage battery 23 is fixed on the connecting block 2; a hydraulic rod 57 is fixed to the inner side of the support frame 1 through a fixed block, and the telescopic end of the hydraulic rod 57 is connected to the moving plate 5. After the second motor 22 is started, it can drive the connecting column 21 to drive the connecting block 2 to rotate, and the storage battery 23 can supply power to the first automatic telescopic rod 3, the second automatic telescopic rod 4, the first electromagnet 35, and the solenoid valve on the short pipe 27.

[0029] As Figure 1 and Figure 9As shown in the figure, fixed frames 8 are fixed on both sides of the support frame 1 above the connecting block 2. A movable bar 81 that can move back and forth is provided in the fixed frame 8. A conveying unit 82 that is slidably connected in the fixed frame 8 is fixed to the bottom of the movable bar 81. A fourth automatic telescopic rod 83 is fixed to the conveying surface of the conveying unit 82. The telescopic end of the fourth automatic telescopic rod 83 is fixed with a U-shaped material taking frame 84 through a connecting frame. Fifth automatic telescopic rods 85 are fixed to both sides of the material taking frame 84. The telescopic ends of the fifth automatic telescopic rods 85 are fixed with movable blocks 86 located inside the material taking frame 84. Second electromagnets 87 are fixed to the opposite surfaces of the two movable blocks 86 through fixing columns. The two external conveyor belts of the conveying gas tank 9 can be respectively located directly below the two fixed frames 8. The conveying unit 82 includes a frame body, a driving roller and a driven roller rotatably connected in the frame body, a conveyor belt arranged in the frame body, the driving roller and the driven roller are connected by a transmission belt, and a servo motor fixed to the frame body. The rotating shaft of the servo motor is fixed to one end of the driving roller; the fixed end of the fourth automatic telescopic rod 83 is fixed to the conveyor belt through a connecting disc. The connecting frame is arranged in a U shape. After starting the fourth automatic telescopic rod 83 to drive the connecting frame to drive the material taking frame 84 to move downward, the gas tank 9 on the external conveyor belt can be located between the two movable blocks 86. Then the two fifth automatic telescopic rods 85 are started to make the two movable blocks 86 approach each other. After the second electromagnets 87 contact the gas tank 9, magnetic force is generated to adsorb the gas tank 9, completing the fixation of the gas tank 9 and facilitating the feeding and material taking of the gas tank 9; the material taking frame 84 on the right side of the support frame 1 can feed the gas tank 9, and the material taking frame 84 on the left side of the support frame 1 can take the gas tank 9 that has been detected; a ball screw is rotatably connected in the fixed frame 8. The ball screw is threadedly connected with the movable bar 81. A driving motor (using a servo motor) with a rotating shaft fixed to the end of the ball screw is fixed in the fixed frame 8. The driving motor can drive the ball screw to rotate and then drive the movable bar 81 to move back and forth (in the Figure 1 orientation shown), so as to facilitate the feeding or discharging of a plurality of gas tanks 9 in sequence.

[0030] As Figure 9 shown, rubber columns 88 are fixed to the opposite surfaces of the two movable blocks 86 through connecting rods. After the rubber columns 88 on the two movable blocks 86 hold the gas tank 9, the firmness of the gas tank 9 can be increased.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A liquefied gas tank sealing detection device, including a support frame, characterized in that: On the inner side of the support frame, there is a rotatable connection block. A fixed pipe is fixed on the connection block, and one end of the fixed pipe can be inserted into the mouth of the gas tank. Inside the connection block, there is a connecting pipe fitting for conveying the detection gas into the fixed pipe; on the inner side of the support frame, there is a movable plate that can be lifted and lowered. At the bottom of the movable plate, there is a sleeve located above the connection block. Inside the sleeve, there is a circular shell that can be lifted and lowered. Circular holes are formed at the top and bottom of the circular shell, and fixed rings are fixed. Inside the fixed rings, there are inflatable strips arranged in a ring shape and capable of being inflated and expanded; inside the circular shell, there is a gas detector and an electric telescopic rod located between the two fixed rings. The telescopic end of the electric telescopic rod is fixed with a marking pen.

2. The hermeticity detection device for a liquefied gas tank according to claim 1, wherein: On the connection block, a first automatic telescopic rod and a second automatic telescopic rod are fixed. The telescopic ends of the first automatic telescopic rod and the second automatic telescopic rod are respectively fixed with a bearing plate and a resisting plate that are slidably connected to the connection block. The fixed pipe is located between the bearing plate and the resisting plate; on the side of the bearing plate close to the resisting plate, a first electromagnet is inlaid.

3. The hermeticity detection device for a liquefied gas tank according to claim 2, characterized in that: On each of the four large faces of the connection block, there is a set of fixed pipes, and there is a set of first electromagnets on the bearing plate; on both sides of the first electromagnet, there are fixing plates fixed on the bearing plate. On the opposite faces of the two fixing plates, springs are fixed, and the other ends of the springs are fixed with pressing plates that are slidably connected to the bearing plate.

4. A liquefied gas tank sealing performance detection device according to claim 1, characterized in that: On the sleeve, a first motor is fixed. On the rotating shaft of the first motor, there is a lead screw located inside the sleeve, and a limiting rod is fixed inside the sleeve; inside the sleeve, there is a lifting ring slidably connected to the circular shell. The lead screw is threadedly connected to the lifting ring, and the limiting rod penetrates through the lifting ring; inside the circular shell, an air inflation pump and an air extraction pump connected to the inflatable strip are fixed. The top of the sleeve penetrates through a telescopic cylinder whose telescopic end extends to the inside of the inflatable strip located above. A suction fan is fixed inside the circular shell.

5. The leak detection device for a liquefied gas tank according to claim 1, wherein: Inside the circular shell, two vertically arranged plates that are symmetric left and right are fixed. The number of gas detectors and electric telescopic rods is two respectively. The opposite faces of the two vertically arranged plates are respectively fixed to the two gas detectors and the two electric telescopic rods. The two electric telescopic rods are arranged in a vertically staggered manner.

6. The hermeticity detection device for a liquefied gas tank according to claim 3, wherein: On one side of the connection block, there is a perforation extending to the other side. Inside the perforation, a set of connection shells arranged in a circular array is fixed. A short pipe is communicated with the connection shell; several sets of fixed pipes are respectively communicated with a set of connection shells, and an annular plate located outside the connection block is fixed on the fixed pipe.

7. An inspection device for the airtightness of a liquefied gas tank according to claim 6, characterized in that: The connecting pipe fitting includes a long pipe located inside the perforation of the connection block. Inside the long pipe, an exhaust pipe, a suction pipe, and a return pipe are fixed. One ends of the exhaust pipe, the suction pipe, and the return pipe extend outside the connection block. One ends of the exhaust pipe, the suction pipe, and the return pipe located inside the connection block are respectively communicated with a metal hose. The other end of the metal hose is communicated with a connection head. A connecting plate is fixed on the connection head. On the long pipe, there is a third automatic telescopic rod for driving the movement of the connecting plate; one end of the long pipe located outside the connection block is fixed with a fixed rod connected to the outer wall of the support frame.

8. An airtightness detection device for a liquefied gas tank according to claim 7, characterized in that: On both sides of the connection block, connection columns rotatably connected to the inner wall of the support frame are respectively fixed. On the support frame, a second motor with a rotating shaft fixed to one connection column is fixed through a connection seat. One end of the long pipe close to the fixed rod penetrates through one connection column far from the second motor and is rotatably connected to this connection column. A storage battery is fixed on the connection block; inside the support frame, a hydraulic rod is fixed through a fixing block, and the telescopic end of the hydraulic rod is connected to the moving plate.

9. The hermeticity detection device for a liquefied gas tank according to claim 1, wherein: On both sides of the support frame, fixed frames located above the connection block are respectively fixed. Inside the fixed frames, movable strips that can move back and forth are provided. At the bottom of the movable strip, a conveying unit slidably connected inside the fixed frame is fixed. On the conveying surface of the conveying unit, a fourth automatic telescopic rod is fixed. The telescopic end of the fourth automatic telescopic rod is fixed with a U-shaped material taking frame through a connecting frame. On both sides of the material taking frame, fifth automatic telescopic rods are fixed. The telescopic ends of the fifth automatic telescopic rods are fixed with moving blocks located inside the material taking frame. On the opposite surfaces of the two moving blocks, second electromagnets are fixed through fixing columns.

10. An apparatus for detecting the airtightness of a liquefied gas tank according to claim 9, characterized in that: On the opposite surfaces of the two moving blocks, rubber columns are fixed through connecting rods.

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