Pressure testing device for pressure vessel

Abstract

The present invention discloses a pressure test device for a pressure vessel, which relates to the technical field of pressure test devices and includes a pressurizing mechanism, wherein the pressurizing mechanism includes an outer frame, the side walls of the outer frame are fixedly connected to multiple groups of glass plates, and the inner wall of the outer frame is fixedly connected to a sealing protection mechanism. The present invention pushes the rotating blocks on two groups of arc rods so that the rotating blocks with limit rings drive the limit rings to be sleeved on the outer wall of the limit pins, and then slides the sliding plates at the edges of the rubber sheets at the edges onto the outer walls of the convex strips on a group of connecting rods next to them, so that the multiple groups of connecting rods and the rubber sheets are in a circular fan state, and then pushes the multiple groups of connecting rods, and relies on the elastic force of the rubber sheets to make the connecting rods fit on the outer wall of the pressure vessel, so that during the pressure test process, the pressure vessel can be wrapped by the connecting rods and the rubber sheets, so that when the pressure vessel bursts, the fragments generated by the pressure burst are prevented from splashing out, and the workers are prevented from being injured by the splashing fragments.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure testing devices, in particular to a pressure testing device for a pressure vessel. Background Art

[0002] Pressure vessels have a wide range of uses. They play an important role in the fields of new energy, chemical industry, medicine, food, sewage treatment and scientific research. When some pressure vessels are partially modified, such as adding new pipes or other accessories to the pressure vessels, or changing the diameter of the original pipes of the equipment, it is usually necessary to conduct a pressure test on the pressure vessels after the modification to ensure that the modified pressure vessels meet the use standards.

[0003] In the existing technology, during the pressure test process, some pressure vessels may not meet the product quality requirements. The pressure test process is to detect these non-compliant products. However, during the pressure test process, when these unqualified products are tested, when the defective pressure vessels are tested, the vessels cannot withstand the pressure and burst. The metal debris generated during the burst may hit the operator, posing a threat to the operator's safety. Therefore, a pressure test device for pressure vessels is proposed. Summary of the Invention

[0004] Based on this, the object of the present invention is to provide a pressure testing device for a pressure vessel to solve the technical problems raised in the above background.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a pressure testing device for a pressure vessel, comprising a pressurizing mechanism, the pressurizing mechanism comprising an outer frame, a plurality of glass plates being fixedly connected to the side walls of the outer frame, and a sealing protection mechanism being fixedly connected to the inner wall of the outer frame;

[0006] The top end face of said sliding arm is fixedly provided with a toothed connecting strip which is cooperatively connected with said toothed connecting strip.

[0007] As an optimal technical solution, the side wall of the plug is slidably connected to multiple groups of sliders near the bottom end, and the inner wall of each group of sliders is slidably sleeved with a group of limit seats, the side walls of the limit seats are fixedly connected to the inner wall of the plug, and the bottom end of the limit seat is rotatably connected to a rotating plate located inside the slider, and the side wall of the slider is fixedly connected to a baffle rod, which is attached to the side wall of the rotating plate.

[0008] As an optimal technical solution, the top of each group of sliders is fixedly connected to a group of threaded rods, the top of the threaded rods extends to the inside of the plug, and the inner wall of the plug is rotatably connected to multiple groups of gears, and each group of gears is threadedly connected to the outer wall of a group of threaded rods.

[0009] As an optimal technical solution, the inner wall of the plug is rotatably connected to a ring gear, which is engaged with multiple sets of gears at the same time. The outer wall of the ring gear is fixedly sleeved with a worm gear, and the inner wall of the plug is rotatably connected to a worm, which is engaged with the worm gear, and the end of the worm gear extends to the outside of the plug.

[0010] As an optimal technical solution, a cover plate is provided at the top of the outer frame, a push rod is hinged to the top of the cover plate, a sleeve is hinged to the top of the cover plate next to the push rod, a piston is slidably sleeved on the inner wall of the sleeve, a push rod is fixedly connected to the side wall of the piston, the end of the push rod extends to the outside of the sleeve, and the end of the push rod is hinged to the side wall of the push rod.

[0011] As a preferred technical solution, an air inlet is provided on the side wall of the sleeve at one end away from the push rod, a first one-way valve that matches the air inlet is provided on the inner wall of the sleeve, a first high-pressure pipe is connected to the outer wall of the sleeve, a second one-way valve is provided at the connection point of the sleeve with the first high-pressure pipe, an air outlet is provided on the inner wall of the sleeve, and the second one-way valve matches the air outlet.

[0012] As an optimal technical solution, the end of the first high-pressure pipe is connected to a connecting seat, the connecting seat is fixedly sleeved on the inner wall of the cover plate, the top of the connecting seat is fixedly connected to a pressure relief head, the connecting seat is provided with a through hole at the connection with the pressure relief head, and the top of the pressure relief head is provided with multiple groups of pressure relief holes.

[0013] As an optimal technical solution, a baffle is provided on the inner wall of the pressure relief head, the baffle is attached to the top of the through hole, the top of the baffle is fixedly connected to a guide rod, and the guide rod is slidably connected to the inner wall of the pressure relief head.

[0014] As an optimal technical solution, the inner wall of the guide rod is rotatably connected to an adjusting screw, the outer wall of the adjusting screw is threadedly connected to an adjusting plate, the adjusting plate is slidably sleeved on the inner wall of the guide rod, and both ends of the adjusting plate extend to the outside of the guide rod.

[0015] As an optimal technical solution, a pressure relief spring is sleeved on the outer wall of the guide rod, the bottom end of the pressure relief spring abuts against the top end of the adjustment plate, and the top end of the pressure relief spring abuts against the top end of the inner wall of the pressure relief head.

[0016] In summary, the present invention mainly has the following beneficial effects:

[0017] 1. The present invention pushes the rotating blocks on the two sets of arc-shaped rods, so that the rotating blocks with the limiting ring drive the limiting ring to be sleeved on the outer wall of the limiting pin, and then the sliding plate at the edge of the rubber sheet is slidably sleeved on the outer wall of the convex strip on the adjacent set of connecting rods, so that multiple sets of connecting rods and rubber sheets are in a circular fan state, and then the multiple sets of connecting rods are pushed, and the elastic force of the rubber sheet makes the connecting rods fit the outer wall of the pressure vessel, so that during the pressure test, the pressure vessel can be wrapped by the connecting rods and the rubber sheet, so that when the pressure vessel bursts, the fragments generated by the pressure burst are prevented from splashing out, and the workers are prevented from being injured by the splashing fragments;

[0018] 2. During the pressure test, the present invention adds clean water to the interior of the outer frame, thereby utilizing the resistance of water to further reduce the impact force of the pressure vessel bursting, thereby further improving the safety of the pressure test. During the pressure test, the push rod drives the piston to slide repeatedly, thereby continuously injecting air into the pressure vessel. The presence of bubbles can be observed through the glass plate, allowing the sealing of the pressure vessel to be checked conveniently and efficiently.

[0019] 3. The present invention pushes the baffle through air pressure to expel air, so that during the pressure test, when the air pressure inside the pressure vessel exceeds the preset pressure value, the excess air can be automatically expelled, avoiding damage to the pressure vessel due to the air pressure exceeding the preset value. In addition, the preset air pressure value can be adjusted according to the pressure resistance of different pressure vessels, making the pressure test device more flexible and adaptable during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a structural schematic diagram of the cover plate and the outer frame in a separated state according to the present invention;

[0022] Figure 3 This is a structural schematic diagram of the connection state of the sleeve and the plug of the present invention;

[0023] Figure 4 This is a schematic diagram of the top structure of the plug of the present invention;

[0024] Figure 5This is a schematic diagram of the bottom end structure of the plug of the present invention;

[0025] Figure 6 This is a structural schematic diagram of the connection plate and the sliding plate of the present invention in a separated state;

[0026] Figure 7 This is a structural schematic diagram of the present invention in a state where the limit pin and the fixing seat are separated;

[0027] Figure 8 This is a schematic diagram of the internal structure of the plug of the present invention;

[0028] Figure 9 Schematic diagram of the cross-sectional structure of the slider of the present invention;

[0029] Figure 10 Schematic diagram of the cross-sectional structure of the casing of the present invention;

[0030] Figure 11 This is a schematic diagram of the cross-sectional structure of the connecting seat of the present invention;

[0031] Figure 12 For the present invention Figure 11 A is an enlarged structural diagram of FIG.

[0032] In the figure: 1. Pressurizing mechanism; 2. Sealing protection mechanism;

[0033] 101. Outer frame; 102. Glass plate; 103. Cover plate; 104. Push rod; 105. Sleeve; 106. Piston; 107. Ejector rod; 108. Air inlet; 109. First one-way valve; 110. Air outlet; 111. First high-pressure pipe; 112. Second one-way valve; 113. Connecting seat; 114. Pressure relief head; 115. Through hole; 116. Baffle; 117. Guide rod; 118. Adjusting screw; 119. Adjusting plate; 120. Pressure relief spring; 121. Pressure relief hole.

[0034] 201. Second high-pressure pipe; 202. Plug; 203. Slider; 204. Limit seat; 205. Rotating plate; 206. Stop rod; 207. Threaded rod; 208. Gear; 209. Ring gear; 210. Worm gear; 211. Worm; 212. Fixed seat; 213. Limit pin; 214. Spring sheet; 215. Arc rod; 216. Rotating block; 217. Limit ring; 218. Connecting rod; 219. Raised strip; 220. Sliding plate; 221. Rubber sheet. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0036] The following describes an embodiment of the present invention based on its overall structure.

[0037] A pressure test device for a pressure vessel, such as Figures 1 to 12 As shown, it includes a pressurizing mechanism 1, the pressurizing mechanism 1 includes an outer frame 101, the side walls of the outer frame 101 are fixedly connected to multiple groups of glass plates 102, and the inner wall of the outer frame 101 is fixedly connected to a sealing protection mechanism 2;

[0038] The sealing protection mechanism 2 includes a second high-pressure tube 201, the bottom end of the second high-pressure tube 201 is provided with a plug 202 located inside the outer frame 101, the top of the plug 202 is fixedly connected with two groups of fixed seats 212, the inner walls of the two groups of the fixed seats 212 are respectively slidably connected with a group of limit pins 213 extending to the outside of the fixed seats 212, one end of the limit pin 213 located inside the fixed seat 212 is fixedly connected with a spring sheet 214, the end of the spring sheet 214 is fixedly connected to the inner wall of the fixed seat 212, two groups of arc rods 215 are fixedly connected between the two groups of the fixed seats 212, and the outer walls of the two groups of the arc rods 215 are respectively slidably provided with a plurality of groups The rotating block 216, the side walls of the four groups of rotating blocks 216 closest to the limit pin 213 are respectively fixedly connected with a group of limit rings 217, and the side walls of each group of the rotating blocks 216 are respectively hinged with a group of connecting rods 218, and the multiple groups of connecting rods 218 on the side walls of each group of the rotating blocks 216 are connected end to end, and each group of the connecting rods 218 is rotatably connected to the adjacent connecting rods 218, and each group of the connecting rods 218 is fixedly connected with a group of ridges 219 on both sides, and the outer wall of one group of the ridges 219 is slidably sleeved with a sliding plate 220, and the side wall of the sliding plate 220 is fixedly connected with a rubber sheet 221, and the end of the rubber sheet 221 is fixedly connected with another group of sliding plates 220.

[0039] Add clean water to the outer frame 101, and then after the plug 202 is sealed and connected to the pressure vessel, push the rotating block 216 near the end so that the rotating block 216 drives the limiting ring 217 to approach the limiting pin 213, so that the limiting ring 217 pushes the limiting pin 213 to slide toward the inside of the fixing seat 212 and compresses the spring sheet 214. After the limiting ring 217 is completely sleeved on the outer wall of the limiting pin 213, the spring sheet 214 rebounds, causing the limiting pin 213 to reset. At this time, the limiting ring 217 is blocked by the limiting pin 213. When the four groups of limiting rings 217 are all limited by the limiting pin 213, multiple groups of rotating rings 217 are now The distance between the moving blocks 216 is pulled apart, so that the multiple groups of connecting rods 218 are distributed in a fan shape, and the rubber sheet 221 is stretched out, and then the connecting rods 218 are pushed to rotate, so that the connecting rods 218 are fitted against the outer wall of the pressure vessel. Under the elastic force of the rubber sheet 221, the connecting rods 218 are fitted against the pressure vessel, so that during the pressure test, if there is a quality problem with the pressure vessel and it explodes, the connecting rods 218 and the rubber sheet 221 can block the fragments to prevent the fragments from shattering the glass plate 102, thereby increasing the safety during the pressure test. Then, the pressure vessel is placed in clean water and covered with the cover plate 103 to carry out the pressure test.

[0040] Please refer to Figure 3 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 and Figure 10The side wall of the plug 202 is slidably connected to multiple groups of sliders 203 near the bottom end. The inner wall of each group of sliders 203 is slidably sleeved with a group of limit seats 204. The side wall of the limit seat 204 is fixedly connected to the inner wall of the plug 202. The bottom end of the limit seat 204 is rotatably connected to a rotating plate 205 located inside the slider 203. The side wall of the slider 203 is fixedly connected to a blocking rod 206. The blocking rod 206 is attached to the side wall of the rotating plate 205. The top of each group of sliders 203 is fixedly connected to the inner wall of the plug 202. A set of threaded rods 207 are fixedly connected, and the top of the threaded rods 207 extends to the inside of the plug 202. The inner wall of the plug 202 is rotatably connected to multiple sets of gears 208. Each set of gears 208 is respectively threadedly connected to the outer wall of a set of threaded rods 207. The inner wall of the plug 202 is rotatably connected to a gear ring 209, and the gear ring 209 is meshed with multiple sets of gears 208 at the same time. The outer wall of the gear ring 209 is fixedly sleeved with a worm gear 210. The inner wall of the plug 202 is rotatably connected to a worm 211. The worm wheel 210 is meshed with the worm 211, the end of the worm 211 extends to the outside of the plug 202, the top of the outer frame 101 is provided with a cover plate 103, the top of the cover plate 103 is hinged with a push rod 104, the top of the cover plate 103 is hinged with a sleeve 105 located next to the push rod 104, the inner wall of the sleeve 105 is slidably sleeved with a piston 106, the side wall of the piston 106 is fixedly connected to a push rod 107, the end of the push rod 107 extends to the outside of the sleeve 105, and the push rod 107 is fixed to the side wall of the piston 106. The end of 07 is hinged to the side wall of the push rod 104, and an air inlet 108 is provided on the side wall of the sleeve 105 away from the push rod 104. The inner wall of the sleeve 105 is provided with a first one-way valve 109 that matches the air inlet 108. The outer wall of the sleeve 105 is connected to a first high-pressure pipe 111, and the sleeve 105 is provided with a second one-way valve 112 at the connection point with the first high-pressure pipe 111. The inner wall of the sleeve 105 is provided with an air outlet 110, and the second one-way valve 112 matches the air outlet 110.

[0041] The bottom end of the plug 202 is inserted into the interior of the pressure vessel, and then the worm 211 is rotated, so that the worm 211 drives the worm wheel 210 to rotate, and the worm wheel 210 drives the ring gear 209 to rotate, and the ring gear 209 drives the multiple sets of gears 208 to rotate, so that the slider 203 slides upward, and the limit seat 204 is fixed to the plug 202, so the height of the limit seat 204 does not change, so that the slider 203 pushes the rotating plate 205 to fit the side wall of the stop rod 206 and flip, so that the rotating plate 205 extends out of the slider 203. At this time, the rotating plate 205 abuts against the inner wall of the pressure vessel, so that the pressure vessel and the plug 202 are tightly fitted, thereby sealing the inside of the pressure vessel, and then repeatedly pushing and pulling the push rod 104, so that the push rod 104 drives the piston 106 in the sleeve through the push rod 107. 105 slides back and forth inside. When the piston 106 is away from the first one-way valve 109, negative pressure is generated inside the sleeve 105, so that the first one-way valve 109 opens and air enters the sleeve 105. When the piston 106 approaches the first one-way valve 109, high pressure is generated inside the sleeve 105, so that the first one-way valve 109 is closed and the second one-way valve 112 is pushed open. At this time, the air inside the sleeve 105 enters the connecting seat 113 through the first high-pressure pipe 111, and then enters the pressure vessel through the second high-pressure pipe 201. The second one-way valve 112 can prevent the air inside the pressure vessel from entering the sleeve 105, thereby pressurizing the inside of the pressure vessel. Then observe whether there are bubbles constantly emerging in the clear water through the glass to judge the sealing of the pressure vessel.

[0042] Please refer to Figure 2 、 Figure 3 、 Figure 11 and Figure 12 The end of the first high-pressure pipe 111 is connected to a connecting seat 113, and the connecting seat 113 is fixedly sleeved on the inner wall of the cover plate 103. The top of the connecting seat 113 is fixedly connected to a pressure relief head 114. The connecting seat 113 is provided with a through hole 115 at the connection with the pressure relief head 114. The top of the pressure relief head 114 is provided with multiple groups of pressure relief holes 121. The inner wall of the pressure relief head 114 is provided with a baffle 116, and the baffle 116 is attached to the top of the through hole 115. The top of the baffle 116 is fixedly connected to a guide rod 117. The guide rod 1 17 is slidingly connected to the inner wall of the pressure relief head 114, the inner wall of the guide rod 117 is rotatably connected to the adjusting screw 118, the outer wall of the adjusting screw 118 is threadedly connected to the adjusting plate 119, the adjusting plate 119 is slidingly sleeved on the inner wall of the guide rod 117, the two ends of the adjusting plate 119 extend to the outside of the guide rod 117, the outer wall of the guide rod 117 is sleeved with a pressure relief spring 120, the bottom end of the pressure relief spring 120 abuts against the top of the adjusting plate 119, and the top of the pressure relief spring 120 abuts against the top of the inner wall of the pressure relief head 114.

[0043] In the process of injecting air into the pressure vessel, if the injected air pressure is too high, the air pressure inside the pressure vessel pushes the baffle 116 through the through hole 115, causing the baffle 116 to move upward and compressing the pressure relief spring 120, thereby allowing the air to be discharged through the pressure relief hole 121 to reduce the air pressure inside the pressure vessel. As the air pressure decreases, the pressure relief spring 120 rebounds, causing the baffle 116 to block the through hole 115, thereby preventing the air inside the pressure vessel from being discharged, so that the pressure inside the pressure vessel is always maintained at a preset value. When the preset pressure value needs to be adjusted, the adjusting screw 118 is rotated so that the adjusting screw 118 drives the adjusting plate 119 on the guide rod The inner wall of 117 slides upward, thereby compressing the pressure relief spring 120, so that the air pressure requires a greater force to lift the baffle 116, thereby increasing the preset pressure value. The preset pressure value can be reduced by rotating the adjusting screw 118 in the opposite direction. When the pressure test is completed, the adjusting screw 118 is pulled upward so that the adjusting screw 118 drives the guide rod 117 to slide upward, thereby causing the adjusting plate 119 to compress the pressure relief spring 120, and the baffle 116 is separated from the through hole 115, so that the air inside the pressure vessel can be discharged through the pressure relief hole 121, so that the air pressure inside the pressure vessel is the same as the atmospheric pressure outside the pressure test device, and then the pressure vessel can be removed from the outer frame 101.

[0044] When in use, the rotating block 216 on the two sets of arc rods 215 is pushed, so that the rotating block 216 with the limit ring 217 drives the limit ring 217 to be sleeved on the outer wall of the limit pin 213, and then the sliding plate 220 at the edge of the rubber sheet 221 at the edge is slidably sleeved on the outer wall of the convex strip 219 on the adjacent set of connecting rods 218, so that the multiple sets of connecting rods 218 and rubber sheets 221 are in a circular fan state, and then the multiple sets of connecting rods 218 are pushed, and the elastic force of the rubber sheets 221 is used to make the connecting rods 218 fit the outer wall of the pressure vessel, so that during the pressure test, the pressure vessel can be wrapped by the connecting rods 218 and the rubber sheets 221, so that when the pressure vessel bursts, the fragments produced by the pressure burst are prevented from splashing out, thereby preventing the staff from being injured by the splashing fragments. The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology.

[0045] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A pressure testing device for a pressure vessel, comprising a pressurizing mechanism (1), characterized in that: The pressurizing mechanism (1) comprises an outer frame (101), a plurality of glass plates (102) are fixedly connected to the side walls of the outer frame (101), and a sealing protection mechanism (2) is fixedly connected to the inner wall of the outer frame (101); The sealing protection mechanism (2) comprises a second high-pressure tube (201), the bottom end of the second high-pressure tube (201) is sleeved with a plug (202) located inside the outer frame (101), the top end of the plug (202) is fixedly connected with two groups of fixed seats (212), the inner walls of the two groups of fixed seats (212) are respectively slidably connected with a group of limit pins (213) extending to the outside of the fixed seats (212), one end of the limit pin (213) located inside the fixed seat (212) is fixedly connected with a spring sheet (214), the end of the spring sheet (214) is fixedly connected to the inner wall of the fixed seat (212), two groups of arc rods (215) are fixedly connected between the two groups of fixed seats (212), and the outer walls of the two groups of arc rods (215) are respectively slidably sleeved with a plurality of groups of The rotating blocks (216) are fixedly connected to the side walls of the four groups of rotating blocks (216) closest to the limiting pin (213) with a group of limiting rings (217) respectively. The side walls of each group of the rotating blocks (216) are hingedly connected to a group of connecting rods (218). The multiple groups of connecting rods (218) on the side walls of each group of the rotating blocks (216) are connected end to end. Each group of the connecting rods (218) is rotatably connected to the adjacent connecting rods (218). Both sides of each group of the connecting rods (218) are fixedly connected to a group of convex strips (219). The outer wall of one group of the convex strips (219) is slidably sleeved with a sliding plate (220). The side walls of the sliding plates (220) are fixedly connected to a rubber sheet (221). The end of the rubber sheet (221) is fixedly connected to another group of sliding plates (220).

2. A pressure testing device for a pressure vessel according to claim 1, characterized in that: The side wall of the plug (202) is slidably connected to a plurality of groups of sliders (203) near the bottom end, and the inner wall of each group of sliders (203) is slidably sleeved with a group of limit seats (204), the side wall of the limit seat (204) is fixedly connected to the inner wall of the plug (202), the bottom end of the limit seat (204) is rotatably connected to a rotating plate (205) located inside the slider (203), and the side wall of the slider (203) is fixedly connected to a blocking rod (206), and the blocking rod (206) is attached to the side wall of the rotating plate (205).

3. A pressure testing device for a pressure vessel according to claim 2, characterized in that: The top of each group of sliders (203) is fixedly connected to a group of threaded rods (207), the top of the threaded rods (207) extends to the inside of the plug (202), and the inner wall of the plug (202) is rotatably connected to multiple groups of gears (208), and each group of gears (208) is threadedly connected to the outer wall of a group of threaded rods (207).

4. The pressure testing device for a pressure vessel according to claim 1, characterized in that: The inner wall of the plug (202) is rotatably connected to a ring gear (209), and the ring gear (209) is simultaneously engaged with multiple sets of gears (208). The outer wall of the ring gear (209) is fixedly sleeved with a worm gear (210), and the inner wall of the plug (202) is rotatably connected to a worm (211), and the worm gear (210) is engaged with the worm gear (211). The end of the worm gear (211) extends to the outside of the plug (202).

5. The pressure testing device for a pressure vessel according to claim 1, characterized in that: The top of the outer frame (101) is provided with a cover plate (103), the top of the cover plate (103) is hinged with a push rod (104), the top of the cover plate (103) is hinged with a sleeve (105) located next to the push rod (104), the inner wall of the sleeve (105) is slidably sleeved with a piston (106), the side wall of the piston (106) is fixedly connected with a push rod (107), the end of the push rod (107) extends to the outside of the sleeve (105), and the end of the push rod (107) is hinged to the side wall of the push rod (104).

6. A pressure testing device for a pressure vessel according to claim 5, characterized in that: An air inlet (108) is provided on one end of the side wall of the sleeve (105) away from the push rod (104), and a first one-way valve (109) is provided on the inner wall of the sleeve (105) and matches the air inlet (108). The outer wall of the sleeve (105) is connected to a first high-pressure pipe (111), and a second one-way valve (112) is provided at the connection point of the sleeve (105) with the first high-pressure pipe (111). An air outlet (110) is provided on the inner wall of the sleeve (105), and the second one-way valve (112) matches the air outlet (110).

7. A pressure testing device for a pressure vessel according to claim 6, characterized in that: The end of the first high-pressure pipe (111) is connected to a connecting seat (113), the connecting seat (113) is fixedly sleeved on the inner wall of the cover plate (103), the top of the connecting seat (113) is fixedly connected to a pressure relief head (114), the connecting seat (113) is provided with a through hole (115) at the connection with the pressure relief head (114), and the top of the pressure relief head (114) is provided with multiple groups of pressure relief holes (121).

8. The pressure testing device for a pressure vessel according to claim 7, characterized in that: The inner wall of the pressure relief head (114) is provided with a baffle (116), the baffle (116) is fitted on the top end of the through hole (115), the top end of the baffle (116) is fixedly connected to a guide rod (117), and the guide rod (117) is slidably connected to the inner wall of the pressure relief head (114).

9. The pressure testing device for a pressure vessel according to claim 8, characterized in that: The inner wall of the guide rod (117) is rotatably connected to an adjusting screw (118), and the outer wall of the adjusting screw (118) is threadedly connected to an adjusting plate (119). The adjusting plate (119) is slidably sleeved on the inner wall of the guide rod (117), and both ends of the adjusting plate (119) extend to the outside of the guide rod (117).

10. The pressure testing device for a pressure vessel according to claim 8, characterized in that: The outer wall of the guide rod (117) is provided with a pressure relief spring (120), the bottom end of the pressure relief spring (120) abuts against the top end of the adjustment plate (119), and the top end of the pressure relief spring (120) abuts against the top end of the inner wall of the pressure relief head (114).

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