Air tightness detection equipment for vacuum tank

Abstract

The invention discloses airtightness detection equipment for a vacuum tank, and relates to the technical field of tank airtightness detection, the airtightness detection equipment comprises a base, the top surface of the base is fixedly connected with a U-shaped support, the inner side of the U-shaped support is provided with a detection device, and the detection device comprises a sealing part; by arranging the glass cup, the water tank, the glass tube, the cover plate, the tank body, the fixing block, the extrusion block, the air bag, the air channel, the elastic piece, the connecting pipe and the air guide pipe, after the vacuum tank is filled with high-pressure air, the vacuum tank is directly placed in the tank body, if the vacuum tank leaks air, the leaked air penetrates through the air channel, the air pressure in the air channel is increased, and the air enters the air bag; the air bag pushes the extrusion block, the outer surface of the extrusion block slides along the inner wall of the air channel, the outer surface of the extrusion block extends to the air channel and extrudes the fixing block, the inner wall of the cover plate and the top face of the tank body are extruded more tightly, air leakage at the joint of the cover plate and the tank body is prevented, and the detection effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tank air tightness detection, and in particular to an air tightness detection device for a vacuum tank. Background Art

[0002] A vacuum tank is a pressure vessel with a hollow cylindrical structure. Both ends of the vacuum tank are welded arc-shaped end covers. A connecting vertical pipe for adjusting the air pressure inside the tank is provided on the outside of the vacuum tank. The vacuum tank needs to undergo a series of rigorous tests after production and processing.

[0003] A Chinese patent discloses a vacuum tank air tightness detection device, with the publication number CN108398213A, comprising an upper box and a lower box, the upper box and the lower box are fixedly connected, the air tightness detection device also includes a compressed air storage tank and at least one gas detector, the compressed air storage tank is fixedly installed in the lower box, the gas detector is placed in the upper box, and the joint of the compressed air storage tank passes through the bottom of the upper box and extends into the upper box, the compressed air storage tank is filled with compressed air containing flammable gas, and the gas detector is connected to the power supply through a wire. The present invention aims to improve the technical problems that the existing air tightness detection equipment is often bulky, complex in structure, and has a high production cost, and is not suitable for use by small and medium-sized automotive parts manufacturers. Compared with other air tightness detection devices, this device has the characteristics of simple structure, low production cost, easy operation, sensitive detection, etc., and is suitable for production and use by small and medium-sized automotive parts manufacturers.

[0004] However, it still includes the following disadvantages: the device uses a compressed air storage tank to introduce flammable gas into the vacuum tank, and uses two gas detectors to detect the leaked flammable gas. However, after the sealed space is formed between the sealing window and the upper box, it is not conducive to the leakage of gas inside the vacuum tank, affecting the detection effect, and the use of flammable gas for detection increases the danger and cost of the device. To this end, we propose an airtightness detection device for vacuum tanks to solve this problem. Summary of the invention

[0005] The present invention provides an airtightness detection device for a vacuum tank to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: An air tightness detection device for a vacuum tank comprises a base, a top surface of the base is fixedly connected to a U-shaped bracket, an inner side of the U-shaped bracket is provided with a detection device, and the detection device comprises a sealing part; The sealing part includes an extrusion block, a fixing block, a tank body, a cover plate, an air guide tube, a water tank and a glass tube. The top surface of the cover plate is fixedly connected with a connecting tube. The left end of the air guide tube is sleeved on the outer surface of the top end of the connecting tube. The bottom surface of the right end of the air guide tube is fixedly connected with the top surface of the water tank. The left end surface of the water tank is fixedly connected with the right end surface of the U-shaped bracket. The cross section of the cover plate is U-shaped, and the inner wall of the cover plate is adapted to the top surface of the tank body. A positioning portion is provided inside the tank body; The positioning part includes a carrier plate, a telescopic rod, a connecting rod and a positioning plate. The bottom surface of the telescopic rod is fixedly connected to the inner wall of the bottom end of the tank body, the top surface of the telescopic rod output rod is fixedly connected to the bottom surface of the carrier plate, the bottom surface of the connecting rod is hinged to the inner wall of the bottom end of the tank body, and the outer surface of the positioning plate is hinged to the outer surface of the connecting rod.

[0007] A further improvement of the technical solution of the present invention lies in that: a hydraulic rod is fixedly connected to the inner wall at the top end of the U-shaped bracket, the bottom surface of the hydraulic rod output rod is fixedly connected to the top surface of the cover plate, a silicone sleeve fixing sleeve is arranged on the outer surface of the air duct, a pressure ring is arranged on the outer side of the silicone sleeve, a bolt is arranged above the pressure ring, a first thread on the outer surface of the bottom end of the bolt penetrates through the top surface of the pressure ring and the top surface of the cover plate, the bottom surface of the pressure ring is in extrusion contact with the outer surface of the silicone sleeve, and the pressure ring and the silicone sleeve are arranged, and the bolt is rotated to make the pressure ring press the silicone sleeve tightly, and when air leakage occurs between the air duct and the connecting pipe, gas enters the inside of the silicone sleeve, causing the silicone sleeve to expand and bulge, reminding the staff to replace the air duct, so as to avoid air leakage between the air duct and the connecting pipe affecting the air tightness detection effect of the vacuum tank.

[0008] A further improvement of the technical solution of the present invention is that: an airway is opened on the outer surface of the cover plate, the extrusion block is arranged inside the airway and is sealed and slidably connected to the inner wall of the airway, the outer surface of the fixed block is fixedly connected to the outer surface of the tank body, and the end face of the fixed block close to the extrusion block is adapted. After the vacuum tank is filled with high-pressure air, the vacuum tank is directly placed inside the tank body. If the vacuum tank leaks, the leaked gas passes through the airway, and the air pressure inside the airway increases, pushing the extrusion block, so that the outer surface of the extrusion block slides along the inner wall of the airway, and the outer surface of the extrusion block extends to the airway and is squeezed by the fixed block, so that the inner wall of the cover plate and the top surface of the tank body are squeezed more tightly, thereby preventing leakage at the connection between the cover plate and the tank body and improving the detection effect.

[0009] A further improvement of the technical solution of the present invention is that: an airbag is fixedly connected to the inner wall of the airway, the outer surface of the airbag is fixedly connected to the outer surface of the extrusion block, the inner wall of the airway is fixedly connected to an elastic part, the outer surface of the elastic part extends to the inside of the airbag and is fixedly connected to the inner wall of the airbag. By setting the airbag, air enters the airbag, causing the airbag to expand and lengthen, and the airbag pushes the extrusion block to move, thereby preventing gas leaking from the vacuum tank from passing through the airway to flow to the outside of the tank body, affecting the air tightness detection effect of the vacuum tank.

[0010] A further improvement of the technical solution of the present invention is that a pressure relief valve is arranged on the top surface of the cover plate, the left end surface of the glass tube is fixedly connected with the right side surface of the bottom end of the water tank, and a glass cup is fixedly connected with the top surface of the glass tube. By arranging the glass cup, when the vacuum tank leaks too quickly and too much, the glass cup is used to load excess water to prevent the water from leaking out, and the pressure relief valve is used to relieve the pressure inside the tank, thereby facilitating the disassembly of the cover plate.

[0011] A further improvement of the technical solution of the present invention lies in that: an outer shell is fixedly sleeved on the outer surface of the tank body, the inside of the outer shell is filled with thermal insulation cotton, a heating pipe and a cooling pipe are arranged inside the tank body, a thermometer is arranged above the cover plate, and the outer surface of the bottom end of the thermometer is fixedly penetrated through the top surface of the cover plate and extends to the bottom of the cover plate. By arranging the heating pipe, the cooling pipe, the outer shell, the thermal insulation cotton and the thermometer, the air temperature inside the tank body is detected by the thermometer, and the heating pipe and the cooling pipe are used to keep the air temperature inside the tank body within a small range to prevent the air inside the tank body from expanding due to heat and affecting the air tightness detection of the vacuum tank.

[0012] A further improvement of the technical solution of the present invention is that: a T-shaped groove is provided on the bottom surface of the carrier plate, and a T-shaped slider is slidably connected to the inner wall of the T-shaped groove, the outer surface of the connecting rod is hinged to the bottom surface of the T-shaped slider, a vacuum tank is placed on the top surface of the carrier plate, and the outer surface of the positioning plate is matched with the outer surface of the vacuum tank. By arranging a telescopic rod, an elastic rod, a T-shaped slider, a positioning plate, an elastic plate, a connecting rod and a carrier plate, after the vacuum tank is placed on the top surface of the carrier plate, the gravity of the vacuum tank itself is utilized to squeeze the carrier plate downward, so that the connecting rod is deflected and the positioning plate clamps the vacuum tank.

[0013] A further improvement of the technical solution of the present invention is that an elastic rod is sleeved on the outside of the telescopic rod, the bottom end of the elastic rod is fixedly connected to the inner wall of the bottom end of the tank body, the top end of the elastic rod is fixedly connected to the bottom surface of the carrier plate, the outer surface of the positioning plate is fixedly connected with an elastic plate, the outer surface of the elastic plate is fixedly connected to the outer surface of the connecting rod, and the elastic force of the elastic rod is used to facilitate the upward resetting of the carrier plate, and the elastic force of the elastic plate is used to make the outer surface of the positioning plate better fit the outer surface of the vacuum tank.

[0014] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art: 1. The present invention provides an air tightness detection device for a vacuum tank. By arranging a glass cup, a water tank, a glass tube, a cover plate, a tank body, a fixed block, an extrusion block, an air bag, an airway, an elastic member, a connecting pipe and an air guide tube, after the vacuum tank is filled with high-pressure air, the vacuum tank is directly placed inside the tank body. If the vacuum tank leaks, the leaked gas passes through the airway to increase the air pressure inside the airway, and the air enters the air bag to expand and lengthen the air bag, and the air bag pushes the extrusion block to make the outer surface of the extrusion block slide along the inner wall of the airway, so that the outer surface of the extrusion block extends to the airway and is squeezed by the fixed block, so that the inner wall of the cover plate and the top surface of the tank body are squeezed more tightly, and leakage at the connection between the cover plate and the tank body is prevented, and the detection effect is improved. At the same time, the leaked gas passes through the air guide tube into the water tank, and pushes the water level inside the glass tube to rise, so that the detection effect is easier to observe. When the vacuum tank leaks too fast and too much, the glass cup is used to load excess water to prevent the water from leaking out. 2. The present invention provides an air tightness detection device for a vacuum tank. By setting a pressure ring and a silicone sleeve, when the air tightness detection of the vacuum tank is performed, the leaked gas passes through the air guide pipe into the water tank, and the pressure ring is pressed against the silicone sleeve by rotating the bolt. When air leakage occurs between the air guide pipe and the connecting pipe, the gas enters the inside of the silicone sleeve, causing the silicone sleeve to swell and bulge, reminding the staff to replace the air guide pipe, thereby preventing air leakage between the air guide pipe and the connecting pipe from affecting the air tightness detection effect of the vacuum tank; 3. The present invention provides an air tightness detection device for a vacuum tank, which detects the air temperature inside the tank by arranging a heating tube, a cooling tube, a shell, a heat-insulating cotton and a thermometer. The heating tube and the cooling tube are used to keep the air temperature inside the tank within a small range, thereby preventing the air inside the tank from expanding due to heat and affecting the air tightness detection of the vacuum tank. 4. The present invention provides an air tightness testing device for a vacuum tank. By arranging a telescopic rod, an elastic rod, a T-shaped slider, a positioning plate, an elastic plate, a connecting rod and a carrier plate, after the vacuum tank is placed on the top surface of the carrier plate, the gravity of the vacuum tank itself is used to make the vacuum tank press the carrier plate downward, so that the connecting rod is deflected and the positioning plate clamps the vacuum tank, so as to prevent the vacuum tank from shaking during the testing process, causing the tank body to generate excess heat, causing the air inside the tank body to expand, and affecting the air tightness test of the vacuum tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a partial cross-sectional view of the three-dimensional structure of the present invention; Figure 3 It is a partial cross-sectional view of the three-dimensional structure of the detection device of the present invention; Figure 4 for Figure 3 A magnified view of the structure at center; Figure 5It is a top cross-sectional view of the three-dimensional structure of the detection device of the present invention; Figure 6 It is a bottom cross-sectional view of the three-dimensional structure of the detection device of the present invention; Figure 7 for Figure 3 A magnified view of the structure at B in the middle; Figure 8 It is a partial cross-sectional view of the three-dimensional structure of the positioning part of the present invention.

[0016] In the figure: 1. base; 2. hydraulic rod; 3. detection device; 4. U-shaped bracket; 5. pressure relief valve; 31. positioning part; 32. sealing part; 301. heating tube; 302. cooling tube; 303. shell; 304. insulation cotton; 305. thermometer; 3101. telescopic rod; 3102. elastic rod; 3103. T-shaped slider; 3104. positioning plate; 3105. elastic plate; 3106. connecting rod; 3107. carrier plate; 3201. glass cup; 3202. water tank; 3203. glass tube; 3204. cover plate; 3206. tank body; 3207. fixing block; 3208. squeezing block; 3209. airbag; 3210. airway; 3211. elastic part; 3212. connecting pipe; 3113. pressure ring; 3114. silicone sleeve, 3215 air guide tube. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with embodiments: Embodiment 1 like Figure 1-6 As shown, the present invention provides an airtightness detection device for a vacuum tank, including a base 1, a U-shaped bracket 4 is fixedly connected to the top surface of the base 1, a detection device 3 is arranged inside the U-shaped bracket 4, and the detection device 3 includes a sealing portion 32.

[0018] The sealing portion 32 includes an extrusion block 3208, a fixing block 3207, a tank body 3206, a cover plate 3204, an air duct 3215, a water tank 3202 and a glass tube 3203. The top surface of the cover plate 3204 is fixedly connected with a connecting tube 3212. The left end of the air duct 3215 is sleeved on the outer surface of the top end of the connecting tube 3212. The bottom surface of the right end of the air duct 3215 is fixedly connected with the top surface of the water tank 3202. The left end surface of the water tank 3202 is fixedly connected with the right end surface of the U-shaped bracket 4. The top surface of the cover plate 3204 is provided with a pressure relief valve 5. The left end surface of the glass tube 3203 is fixedly connected with the right side surface of the bottom end of the water tank 3202. The top surface of the glass tube 3203 is fixedly connected with a glass cup 3201.

[0019] The cross-section of the cover plate 3204 is U-shaped, the inner wall of the cover plate 3204 is matched with the top surface of the tank body 3206, the outer surface of the cover plate 3204 is provided with an airway 3210, the extrusion block 3208 is arranged inside the airway 3210 and is sealingly and slidably connected to the inner wall of the airway 3210, the outer surface of the fixed block 3207 is fixedly connected to the outer surface of the tank body 3206, and the end surface of the fixed block 3207 close to the extrusion block 3208 is matched.

[0020] The inner wall of the airway 3210 is fixedly connected with an airbag 3209, the outer surface of the airbag 3209 is fixedly connected to the outer surface of the extrusion block 3208, the inner wall of the airway 3210 is fixedly connected with an elastic member 3211, the outer surface of the elastic member 3211 extends to the inside of the airbag 3209 and is fixedly connected to the inner wall of the airbag 3209, by arranging a glass cup 3201, a water tank 3202, a glass tube 3203, a cover plate 3204, a tank body 3206, a fixed block 3207, an extrusion block 3208, an airbag 3209, an airway 3210, an elastic member 3211, a connecting pipe 3212 and an air guide pipe 3215, after the inside of the vacuum tank is filled with high-pressure air, the vacuum tank is directly placed inside the tank body 3206, if the vacuum tank leaks, the leaked gas passes through the airway 3210, so that the airway The air pressure inside 3210 increases, and air enters the airbag 3209, causing the airbag 3209 to expand and lengthen. The airbag 3209 pushes the extrusion block 3208, causing the outer surface of the extrusion block 3208 to slide along the inner wall of the airway 3210, and the outer surface of the extrusion block 3208 to extend to the airway 3210 and be extruded with the fixed block 3207, so that the inner wall of the cover plate 3204 and the top surface of the tank body 3206 are squeezed more tightly, preventing air leakage at the connection between the cover plate 3204 and the tank body 3206, thereby improving the detection effect. At the same time, the leaked gas passes through the air guide tube 3215 into the water tank 3202, pushing up the water level inside the glass tube 3203, making the detection effect easier to observe. When the vacuum tank leaks too much and too quickly, use the glass cup 3201 to load excess water to prevent water from leaking out.

[0021] An outer shell 303 is fixedly sleeved on the outer surface of the tank body 3206, and the inside of the outer shell 303 is filled with thermal insulation cotton 304. A heating tube 301 and a cooling tube 302 are arranged inside the tank body 3206. A thermometer 305 is arranged above the cover plate 3204. The outer surface of the bottom end of the thermometer 305 is fixedly penetrated through the top surface of the cover plate 3204 and extends to the bottom of the cover plate 3204. By arranging the heating tube 301, the cooling tube 302, the outer shell 303, the thermal insulation cotton 304 and the thermometer 305, the air temperature inside the tank body 3206 is detected by the thermometer 305. By utilizing the heating tube 301 and the cooling tube 302, the air temperature inside the tank body 3206 is maintained within a small range, so as to prevent the air inside the tank body 3206 from expanding due to heat and affecting the air tightness detection of the vacuum tank.

[0022] Embodiment 2 like Figure 1-7 As shown, on the basis of the first embodiment, the inner wall of the top of the U-shaped bracket 4 is fixedly connected to the hydraulic rod 2, the bottom surface of the output rod of the hydraulic rod 2 is fixedly connected to the top surface of the cover plate 3204, the silicone sleeve 3114 is fixedly sleeved on the outer surface of the air guide pipe 3215, the outer side of the silicone sleeve 3114 is sleeved with a pressure ring 3213, and a bolt is arranged above the pressure ring 3213. The first thread on the outer surface of the bottom end of the bolt penetrates the top surface of the pressure ring 3213 and the top surface of the cover plate 3204, and the bottom surface of the pressure ring 3114 is pressed and contacted with the outer surface of the silicone sleeve 3214. By setting the pressure ring 3114 13 and the silicone sleeve 3114. When the air tightness test of the vacuum tank is being carried out, the leaked gas passes through the air pipe 3215 and enters the water tank 3202. By rotating the bolt, the pressure ring 3113 presses the silicone sleeve 3114. When air leakage occurs between the air pipe 3215 and the connecting pipe 3212, the gas enters the silicone sleeve 3114, causing the silicone sleeve 3114 to swell, reminding the staff to replace the air pipe 3215 to prevent air leakage between the air pipe 3215 and the connecting pipe 3212 from affecting the air tightness test effect of the vacuum tank.

[0023] Embodiment 3 like Figure 1-8 As shown, based on the second embodiment, a positioning portion 31 is provided inside the tank body 3206; The positioning part 31 includes a carrier plate 3107, a telescopic rod 3101, a connecting rod 3106 and a positioning plate 3104. The bottom surface of the telescopic rod 3101 is fixedly connected to the inner wall of the bottom end of the tank body 3206, the top surface of the output rod of the telescopic rod 3101 is fixedly connected to the bottom surface of the carrier plate 3107, the bottom surface of the connecting rod 3106 is hinged to the inner wall of the bottom end of the tank body 3206, the outer surface of the positioning plate 3104 is hinged to the outer surface of the connecting rod 3106, a T-shaped groove is provided on the bottom surface of the carrier plate 3107, a T-shaped slider 3103 is slidably connected to the inner wall of the T-shaped groove, the outer surface of the connecting rod 3106 is hinged to the bottom surface of the T-shaped slider 3103, a vacuum tank is placed on the top surface of the carrier plate 3107, and the outer surface of the positioning plate 3104 is adapted to the outer surface of the vacuum tank.

[0024] The outer side of the telescopic rod 3101 is sleeved with an elastic rod 3102, the bottom end of the elastic rod 3102 is fixedly connected to the inner wall of the bottom end of the tank body 3206, the top of the elastic rod 3102 is fixedly connected to the bottom surface of the carrier plate 3107, the outer surface of the positioning plate 3104 is fixedly connected to the elastic plate 3105, the outer surface of the elastic plate 3105 is fixedly connected to the outer surface of the connecting rod 3106, and the telescopic rod 3101, the elastic rod 3102, the T-shaped slider 3103, the positioning plate 310 4. After placing the vacuum tank on the top of the carrier 3107, the vacuum tank uses its own gravity to press the carrier 3107 downward, deflect the connecting rod 3106, and clamp the vacuum tank with the positioning plate 3104 to prevent the vacuum tank from shaking during the detection process, causing the tank body 3206 to generate excess heat and expand the air inside the tank body 3206, which will affect the air tightness detection of the vacuum tank.

[0025] The following is a detailed description of the working principle of the airtightness detection equipment for vacuum tanks.

[0026] like Figure 1-4 As shown, after the vacuum tank is filled with high-pressure air, the vacuum tank is directly placed on the top surface of the carrier plate 3107 inside the tank body 3206, so that the vacuum tank presses the carrier plate 3107 downward, so that the connecting rod 3106 deflects, and the connecting rod 3106 drives the positioning plate 3104 to deflect, so that the positioning plate 3104 clamps the vacuum tank. If the vacuum tank leaks, the leaked gas passes through the airway 3210, so that the air pressure inside the airway 3210 increases, and the air enters the airbag 3209, so that the airbag 320 9 expands and becomes longer, the airbag 3209 pushes the extrusion block 3208, so that the outer surface of the extrusion block 3208 slides along the inner wall of the airway 3210, and the outer surface of the extrusion block 3208 extends to the airway 3210 and is squeezed with the fixing block 3207, so that the inner wall of the cover plate 3204 and the top surface of the tank body 3206 are squeezed more tightly, and the gas passes through the air guide pipe 3215 into the water tank 3202. The water body pushes the water level in the water tank 3202 to drop, and the water level in the glass tube 3203 rises.

[0027] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An airtightness detection device for a vacuum tank, comprising a base (1), characterized in that: A U-shaped bracket (4) is fixedly connected to the top surface of the base (1), a detection device (3) is arranged inside the U-shaped bracket (4), and the detection device (3) comprises a sealing portion (32); The sealing portion (32) comprises an extrusion block (3208), a fixing block (3207), a tank body (3206), a cover plate (3204), an air guide tube (3215), a water tank (3202) and a glass tube (3203); the top surface of the cover plate (3204) is fixedly connected with a connecting tube (3212); the left end of the air guide tube (3215) is sleeved on the outer surface of the top end of the connecting tube (3212); the bottom surface of the right end of the air guide tube (3215) is fixedly connected with the top surface of the water tank (3202); the left end surface of the water tank (3202) is fixedly connected with the right end surface of the U-shaped bracket (4); the cross section of the cover plate (3204) is U-shaped; the inner wall of the cover plate (3204) is matched with the top surface of the tank body (3206); An air passage (3210) is provided on the outer surface of the cover plate (3204); the extrusion block (3208) is arranged inside the air passage (3210) and is sealingly and slidably connected to the inner wall of the air passage (3210); the outer surface of the fixing block (3207) is fixedly connected to the outer surface of the tank body (3206); and the end surfaces of the fixing block (3207) and the extrusion block (3208) on the adjacent sides are adapted to each other; The inner wall of the air channel (3210) is fixedly connected to an air bag (3209), the outer surface of the air bag (3209) is fixedly connected to the outer surface of the extrusion block (3208), the inner wall of the air channel (3210) is fixedly connected to an elastic member (3211), and the outer surface of the elastic member (3211) extends into the interior of the air bag (3209) and is fixedly connected to the inner wall of the air bag (3209); The top surface of the cover plate (3204) is provided with a pressure relief valve (5); the left end surface of the glass tube (3203) is fixedly connected to the right side surface of the bottom end of the water tank (3202); and the top surface of the glass tube (3203) is fixedly connected to the glass cup (3201).

2. The airtightness detection device for a vacuum tank according to claim 1, characterized in that: A hydraulic rod (2) is fixedly connected to the inner wall of the top end of the U-shaped bracket (4); the bottom surface of the output rod of the hydraulic rod (2) is fixedly connected to the top surface of the cover plate (3204); a silicone sleeve (3114) is fixedly sleeved on the outer surface of the air guide tube (3215); a pressure ring (3213) is sleeved on the outer side of the silicone sleeve (3114); a bolt is arranged above the pressure ring (3213); a first thread on the outer surface of the bottom end of the bolt penetrates the top surface of the pressure ring (3213) and the top surface of the cover plate (3204); and the bottom surface of the pressure ring (3114) is in extrusion contact with the outer surface of the silicone sleeve (3214).

3. The airtightness detection device for a vacuum tank according to claim 1, characterized in that: The outer surface of the tank body (3206) is fixedly covered with an outer shell (303), the interior of the outer shell (303) is filled with thermal insulation cotton (304), the interior of the tank body (3206) is provided with a heating tube (301) and a cooling tube (302), a thermometer (305) is arranged above the cover plate (3204), and the outer surface of the bottom end of the thermometer (305) is fixedly passed through the top surface of the cover plate (3204) and extends to the bottom of the cover plate (3204).

4. The airtightness detection device for a vacuum tank according to claim 1, characterized in that: The bottom surface of the carrier plate (3107) is provided with a T-shaped slide groove, the inner wall of the T-shaped slide groove is slidably connected to a T-shaped slider (3103), the outer surface of the connecting rod (3106) is hinged to the bottom surface of the T-shaped slider (3103), a vacuum tank is placed on the top surface of the carrier plate (3107), and the outer surface of the positioning plate (3104) is adapted to the outer surface of the vacuum tank.

5. The airtightness detection device for a vacuum tank according to claim 1, characterized in that: An elastic rod (3102) is sleeved on the outside of the telescopic rod (3101); the bottom end of the elastic rod (3102) is fixedly connected to the inner wall of the bottom end of the tank body (3206); the top end of the elastic rod (3102) is fixedly connected to the bottom surface of the carrier plate (3107); the outer surface of the positioning plate (3104) is fixedly connected to an elastic plate (3105); and the outer surface of the elastic plate (3105) is fixedly connected to the outer surface of the connecting rod (3106).

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