Special-shaped pipe sealing test tool and special-shaped pipe sealing test method

Abstract

The application discloses a special-shaped pipe sealing test tool, which comprises a head end sealing assembly and a tail end sealing assembly, the head end sealing assembly comprises a first sealing piece and a first top block, the first sealing piece is arranged in the special-shaped pipe, the inner side surface of the first sealing piece is formed with a neck-in structure, and the outer side surface of the first top block is in airtight contact with the inner side surface of the first sealing piece; the tail end sealing assembly comprises a second sealing piece, the second sealing piece is arranged outside the pipe opening of the special-shaped pipe, the outer side surface of the second sealing piece is a gradually expanding slope surface structure, the second top block is an annular structure, and the second top block is sleeved outside the second sealing piece. The application further provides a special-shaped pipe sealing test method. The application can find the structural defects of the special-shaped pipe in time, is a tool assembly suitable for airtight detection of the special-shaped pipe, can periodically detect the airtightness of the component, and thus realizes early discovery of defects, improves the quality of castings and reduces production cost.

Description

TECHNICAL FIELD

[0001] The pipe sealing test equipment technical field more specifically relates to a special-shaped pipe sealing test tool and a special-shaped pipe sealing test method. BACKGROUND

[0002] Low pressure casting is a casting method in which liquid metal completes the filling and solidification process under the action of pressure (pure inert gas pressure) to obtain a casting. Since the pressure is relatively low (generally 20-60 kPa), it is called low pressure casting, which is a casting method between metal mold casting and pressure casting. And differential pressure casting (also known as counter-pressure casting or differential pressure casting) is a casting method derived from low pressure casting. In low pressure casting or differential pressure casting, the liquid level of liquid metal rises smoothly and controllably, and the pouring process does not occur turbulent flow, and the casting crystallizes and solidifies under pressure, and the casting organization density is improved, and the mechanical properties of the cast alloy are greatly improved.

[0003] In low pressure casting, the metal liquid at the bottom of the crucible is sent into the casting cavity through the riser pipe. The riser pipe is a necessary structural part for connecting the crucible and the casting cavity, and provides a necessary flow channel for the metal liquid to enter the cavity.

[0004] In the prior art, the riser pipe is not a one-piece structure, but is welded by multiple pipe segments of different structures (specifically, it is welded by three parts, a disc structure at the top, a middle pipe segment, and a tail segment). The riser pipe needs to be baked and heated to about 500℃ before use and then kept for a period of time, so that the riser pipe can be used. Therefore, the riser pipe will be ablated during repeated use and heating. In addition, after the heated riser pipe is taken out of the box furnace during production, the riser pipe may be dropped or knocked, and the riser pipe may be subjected to high pressure during use, so that cracks may occur at the weld position of the riser pipe. From the initiation to the expansion to the final cracking, it is difficult to be discovered in time. Once the riser pipe cracks, gas will enter the casting cavity from the crack during the casting pouring process, resulting in the rejection of the casting. In addition, due to the long processing cycle of the casting and other reasons, when the defect of the riser pipe is found, multiple rejected castings may have been produced, causing great waste of cost. SUMMARY

[0005] (I) Technical problem

[0006] Therefore, how to provide a tool for detecting the gas tightness of special-shaped pipe such as a riser pipe, for periodically detecting the gas tightness of the component, to achieve early detection of defects, thereby improving the quality of the casting and reducing the production cost, has become a problem to be solved by those skilled in the art.

[0007] (II) Technical Solution

[0008] The present application provides a special-shaped pipe sealing test tool for realizing sealing test of special-shaped pipes.

[0009] In the present application, the special-shaped pipe sealing test tool comprises:

[0010] A head-end sealing assembly is arranged at the head end of the special-shaped pipe to realize internal sealing of the pipe opening, the head-end sealing assembly comprises a first sealing member with an annular structure, the first sealing member is arranged in the special-shaped pipe, the outer side surface of the first sealing member is in airtight contact with the inner side surface of the pipe opening, the inner side surface of the first sealing member is formed with a neck-in structure in the pressure direction, the head-end sealing assembly further comprises a first top block arranged in the neck-in structure of the first sealing member, the outer side surface of the first top block is in airtight contact with the inner side surface of the first sealing member, an airtight adapter is connected through the first sealing member and the first top block, the airtight adapter can exert a pushing force on the first sealing member in the opposite direction of the pressure direction and exert a pulling force on the first top block in the same direction of the pressure direction in the pressure direction.

[0011] A tail-end sealing assembly is arranged at the tail end of the special-shaped pipe to realize external sealing of the pipe opening, the tail-end sealing assembly comprises a second sealing member with an annular structure, the second sealing member is arranged outside the pipe opening of the special-shaped pipe, the inner side surface of the second sealing member is in airtight contact with the outer side surface of the special-shaped pipe, the outer side surface of the second sealing member is a gradually expanding slope structure in the pressure direction, the tail-end sealing assembly comprises a second top block with an annular structure, the second top block is sleeved on the outside of the second sealing member, the inner side surface of the second top block is in airtight contact with the outer side surface of the second sealing member, the tail-end sealing assembly further comprises a connecting member, the connecting member can exert a pushing force on the second sealing member in the opposite direction of the pressure direction and exert a pulling force on the second top block in the same direction of the pressure direction in the pressure direction.

[0012] Preferably, in the special-shaped pipe sealing test tool provided by the present application, the head end of the special-shaped pipe is provided with a flange structure, and the tail end of the special-shaped pipe is a straight circular opening structure with equal diameters; the head-end sealing assembly further comprises a first baffle, the inner side surface of the first baffle abuts against the flange structure of the head end of the special-shaped pipe, one end of the first sealing member towards the first baffle abuts against the inner side surface of the first baffle, and one end of the first top block towards the first baffle is arranged in a spaced manner with the first baffle; the airtight adapter passes through the first baffle and can abut against the outer side surface of the first baffle.

[0013] Preferably, in the sealing test tool for the special-shaped pipe, a first sealing ring is arranged between the first baffle and the flange structure of the head end of the special-shaped pipe; a second sealing ring is arranged on the airtight adapter, and the second sealing ring is in abutment with the inner side of the first baffle to achieve airtight connection between the airtight adapter and the first baffle.

[0014] Preferably, in the sealing test tool for the special-shaped pipe, a sealing ring mounting groove is arranged on the first baffle and corresponds to the positions of the first sealing ring and the second sealing ring.

[0015] Preferably, in the sealing test tool for the special-shaped pipe, the tail end sealing assembly further comprises a second baffle and a third baffle; the second baffle is arranged in the second baffle block and is in abutment with the outer end of the second sealing member, the third baffle is fixedly arranged at the outer end of the second baffle block, and the connecting member is in abutment with the outer side of the second baffle through the third baffle.

[0016] Preferably, in the sealing test tool for the special-shaped pipe, the connecting member is an ejection bolt; and the connecting member is threadedly connected with the third baffle.

[0017] Preferably, in the sealing test tool for the special-shaped pipe, an air source is connected with the airtight adapter; and the air source is a high-pressure gas tank or a gas pump.

[0018] Preferably, in the sealing test tool for the special-shaped pipe, the manufacturing material of the first sealing member is silica gel; and the manufacturing material of the second sealing member is silica gel.

[0019] The application further provides a sealing test method for a special-shaped pipe, and the sealing test method for the special-shaped pipe comprises the following steps:

[0020] Step one: sealing the head end and the tail end of the special-shaped pipe by using the sealing test tool for the special-shaped pipe as described above;

[0021] Step two: pressurizing and pressure maintaining the special-shaped pipe through the airtight adapter of the head end sealing assembly;

[0022] Step three: detecting whether the special-shaped pipe has pressure drop or air leakage.

[0023] Preferably, in the special-shaped pipe sealing test method provided by the application, in the step one, the contact surfaces of the first sealing element, the second sealing element, the first top block and the second top block are polished smooth when the first sealing element is installed; in the step two, the air pressure gauge is installed through the air-tight adapter for air pressure measurement; in the step two, the pressing pressure is between 0.15 MPa and 0.25 MPa, and the pressure maintaining time is between 10 min and 20 min; in the step three, whether the air leakage phenomenon occurs is confirmed by observing whether there is air bubble generated by using the soap water.

[0024] (Three) beneficial effects

[0025] The application provides a special-shaped pipe sealing test tool for realizing sealing test of a special-shaped pipe, which comprises a head end sealing assembly and a tail end sealing assembly. The head end sealing assembly is arranged at the head end of the special-shaped pipe and is used for realizing internal sealing of the pipe opening of the special-shaped pipe. The head end sealing assembly comprises a first sealing element with an annular structure. The first sealing element is arranged in the special-shaped pipe. The outer side surface of the first sealing element is in air-tight contact with the inner side surface of the pipe opening of the special-shaped pipe. The inner side surface of the first sealing element is formed with a neck-in structure in the pressure direction. The head end sealing assembly further comprises a first top block arranged in the neck-in structure of the first sealing element. The outer side surface of the first top block is in air-tight contact with the inner side surface of the first sealing element. An air-tight adapter is connected through the first sealing element and the first top block. In the pressure direction, the air-tight adapter can exert a pushing force on the first sealing element in the opposite direction of the pressure direction and exert a pulling force on the first top block in the same direction of the pressure direction. The tail end sealing assembly is arranged at the tail end of the special-shaped pipe and is used for realizing external sealing of the pipe opening of the special-shaped pipe. The tail end sealing assembly comprises a second sealing element with an annular structure. The second sealing element is arranged outside the pipe opening of the special-shaped pipe. The inner side surface of the second sealing element is in air-tight contact with the outer side surface of the special-shaped pipe. In the pressure direction, the outer side surface of the second sealing element is a gradually expanding slope structure. The tail end sealing assembly comprises a second top block with an annular structure. The second top block is sleeved on the outer side of the second sealing element. The inner side surface of the second top block is in air-tight contact with the outer side surface of the second sealing element. The tail end sealing assembly further comprises a connecting element. In the pressure direction, the connecting element can exert a pushing force on the second sealing element in the opposite direction of the pressure direction and exert a pulling force on the second top block in the same direction of the pressure direction. The application also provides a special-shaped pipe sealing test method, which comprises the following steps: step one, using the special-shaped pipe sealing test tool to seal the head end and the tail end of the special-shaped pipe; step two, pressing and pressure maintaining the special-shaped pipe through the air-tight adapter of the head end sealing assembly; and step three, detecting whether the special-shaped pipe has pressure drop or air leakage phenomenon.

[0026] By means of the structure design, the special-shaped pipe sealing test tool can seal two ends of the special-shaped pipe, and can detect whether the special-shaped pipe leaks by means of pressing after the special-shaped pipe is sealed, so as to confirm whether the special-shaped pipe has structural defects. After the special-shaped pipe sealing test tool is put into use, the special-shaped pipe, especially the structure defect of the liquid lifting pipe, can be quickly and timely found. The special-shaped pipe sealing test tool is a tool assembly suitable for the air tightness detection of the special-shaped pipe such as the liquid lifting pipe, and can periodically detect the air tightness of the component, so that the defect can be found early, the casting quality is improved, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a cross-sectional structure schematic diagram of the special-shaped pipe sealing test tool in the embodiment of the present application.

[0028] Figure 2 It is a cross-sectional structure schematic diagram of the special-shaped pipe sealing test tool in the embodiment of the present application.

[0029] In Figure 1 and Figure 2 , the correspondence between the component names and the reference signs is as follows:

[0030] Special-shaped pipe 1, first sealing member 2, first top block 3, air tightness adapter 4, second sealing member 5, second top block 6, connecting member 7, first baffle 8, second baffle 9, third baffle 10. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application clearer, the following will further describe the embodiments of the present application in combination with the drawings.

[0032] In addition, in the description of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be directly connected, or indirectly connected through intermediate components, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0033] Please refer to Figure 1 and Figure 2 , wherein, Figure 1 It is a cross-sectional structure schematic diagram of the special-shaped pipe sealing test tool in the embodiment of the present application. Figure 2An appearance structure schematic diagram of the special-shaped pipe sealing test tool in the embodiment of the present application.

[0034] The present application provides a special-shaped pipe sealing test tool for realizing the sealing test of a special-shaped pipe 1. In the present application, the special-shaped pipe 1 specifically refers to a riser pipe used in a low-pressure casting process, and the sealing test refers to the test of the sealing of the riser pipe.

[0035] In the prior art, the specific structure of the riser pipe is as follows: the riser pipe includes three pipe segment structures, i.e., a flange plate structure at the head end, an equal-diameter long straight round port structure at the tail end, and an equal-diameter long straight round pipe structure at the middle segment, and the above three pipe segment structures are fixedly connected through welding. Due to the structural characteristics and use characteristics of the riser pipe, problems such as welding seam cracking may occur.

[0036] In order to timely find the welding seam cracking problem of the riser pipe, the present application provides a special-shaped pipe sealing test tool, which judges whether the riser pipe has appeared structural defects (mainly the welding seam cracking problem) by means of gas pressure measurement to measure whether the riser pipe leaks.

[0037] The special-shaped pipe sealing test tool includes a head end sealing assembly and a tail end sealing assembly. The head end sealing assembly is used to be arranged at the head end of the special-shaped pipe 1 (the riser pipe) and can realize the sealing and pressure of the head end of the special-shaped pipe 1. The tail end sealing assembly is used to be arranged at the tail end of the special-shaped pipe 1 (the riser pipe) and can realize the sealing of the tail end of the special-shaped pipe 1.

[0038] The head end sealing assembly is used to be arranged at the head end of the special-shaped pipe 1 and to realize the inner sealing of the pipe port of the special-shaped pipe 1. The inner sealing refers to that the head end sealing assembly can be installed in the pipe port of the special-shaped pipe 1 to seal the end part of the special-shaped pipe 1. As known from the above, in the present application, the special-shaped pipe 1 specifically refers to the riser pipe, and the head end of the riser pipe is a flange plate structure. A round hole structure is arranged at the center of the flange plate structure, and the head end sealing assembly can be assembled in the round hole structure. Specifically, the head end sealing assembly includes a first sealing member 2 with an annular structure. The first sealing member 2 is a special-shaped ring structure, i.e., not a regular circular ring structure. The first sealing member 2 is arranged in the special-shaped pipe 1. The outer side surface of the first sealing member 2 is an equal-diameter cylindrical structure, and the diameter of the outer side surface of the first sealing member 2 is slightly larger than the diameter of the head end pipe port of the special-shaped pipe 1 (slightly larger than 2-4 mm). The outer side surface of the first sealing member 2 is used to be in airtight contact with the inner side surface of the pipe port of the special-shaped pipe 1 (the first sealing member 2 is assembled in the head end pipe port of the special-shaped pipe 1 in interference).

[0039] The pressure direction in the present application refers to the direction of the pressure on the head end sealing assembly and the tail end sealing assembly when the special-shaped pipe 1 is pressed after the head end sealing assembly and the tail end sealing assembly are arranged at both ends of the special-shaped pipe 1.

[0040] The inner side of the first sealing member 2 is formed with a necking structure (the diameter of the inner side of the first sealing member 2 gradually decreases) in the direction of the pressure (i.e. the direction of the pressure on the head-end sealing assembly after the profiled pipe 1 is pressed). The head-end sealing assembly further comprises a first top block 3, which is approximately in the shape of a circular truncated cone, and is provided with a gas passage coaxially arranged therewith for the pressing operation. The first top block 3 is arranged in the necking structure of the first sealing member 2, and the shape and size of the first top block 3 are designed according to the necking structure of the first sealing member 2. The outer side of the first top block 3 is in airtight contact with the inner side of the first sealing member 2. An airtight adapter 4 is connected between the first sealing member 2 and the first top block 3, and in the direction of the pressure, the airtight adapter 4 can apply a pushing force to the first sealing member 2 in the opposite direction of the pressure and a pulling force to the first top block 3 in the same direction of the pressure.

[0041] In the present application, the airtight adapter 4 is in the shape of T, and comprises a connecting pipe and an end flange. The outer side of the connecting pipe is provided with a threaded structure, and the connecting pipe is threadedly connected to the first top block 3 after passing through the first sealing member 2. The end flange of the airtight adapter 4 can be in abutting contact with the outer end surface of the first sealing member 2. A gas pressure gauge can also be mounted on the airtight adapter 4, and the gas source can be connected through the gas pressure gauge.

[0042] In the above structure, the rotating airtight adapter 4 can apply a pushing force to the first sealing member 2 in the opposite direction of the pressure and a pulling force to the first top block 3 in the same direction of the pressure, so that the first sealing member 2 and the first top block 3 move relatively. Based on the special structure design of the first sealing member 2 and the first top block 3, the first top block 3 can make the first sealing member 2 expand, so as to ensure the airtightness and connection strength of the first sealing member 2 and the profiled pipe 1 (after the profiled pipe 1 is pressed, the head-end sealing assembly does not move in the head-end pipe opening of the profiled pipe 1).

[0043] The tail-end sealing assembly is arranged at the tail end of the profiled pipe 1, and is used to realize the external sealing of the pipe opening of the profiled pipe 1. The external sealing refers to that the tail-end sealing assembly is arranged outside the tail end of the profiled pipe 1 to seal the pipe opening of the profiled pipe 1.

[0044] Specifically, the tail-end sealing assembly comprises a second sealing member 5 in the shape of a ring, which is in the shape of a circular truncated cone or a circular cone. The second sealing member 5 is provided with a circular hole structure in the middle, and the diameter of the circular hole structure is designed according to the outer diameter of the tail-end pipe opening of the profiled pipe 1, and is slightly smaller than the outer diameter of the tail-end pipe opening of the profiled pipe 1 (slightly smaller than 2-4 mm), so that the second sealing member 5 can be interference-fitted on the tail-end pipe opening of the profiled pipe 1.

[0045] The second sealing member 5 is arranged outside the pipe opening at the tail end of the profiled pipe 1, and the inner side of the second sealing member 5 is arranged in airtight contact with the outer side of the profiled pipe 1. In the pressure direction, the outer side of the second sealing member 5 is a gradually expanding slope structure, and the overall shape of the second sealing member 5 is a conical structure or a circular truncated cone structure.

[0046] The tail end sealing assembly further comprises a second top block 6, which is an annular structure, specifically, the second top block 6 is a profiled annular structure, that is, the inner annular surface of the second top block 6 is designed according to the shape of the outer side of the second sealing member 5, so that when the second top block 6 is sleeved on the outer side of the second sealing member 5, the inner side of the second top block 6 and the outer side of the second sealing member 5 are in airtight contact.

[0047] The tail end sealing assembly further comprises a connecting member 7, and the main function of the connecting member 7 is to press the profiled pipe 1 when the tail end sealing assembly is arranged outside the pipe opening at the tail end of the profiled pipe 1, and in the pressure direction of the tail end sealing assembly, the connecting member 7 can exert a pushing force on the second sealing member 5 in the opposite direction of the pressure direction and a pulling force on the second top block 6 in the same direction of the pressure direction.

[0048] In the above structure, the rotating connecting member 7 can exert a pushing force on the second sealing member 5 in the opposite direction of the pressure direction and a pulling force on the second top block 6 in the same direction of the pressure direction, so that the second top block 6 and the second sealing member 5 will move relatively, that is, the second sealing member 5 moves in the opposite direction of the pressure direction, and the second top block 6 moves in the pressure direction, and the second top block 6 exerts a force on the second sealing member 5 to make the second sealing member 5 tighten (equivalent to tightly holding the outer side of the pipe opening at the tail end of the profiled pipe), thereby ensuring the airtightness and connection strength of the second sealing member 5 and the profiled pipe 1 (after the profiled pipe 1 is pressed, the tail end sealing assembly does not move on the pipe opening at the tail end of the profiled pipe 1).

[0049] For the profiled pipe 1, the head end of the profiled pipe 1 is provided with a flange structure (the diameter of the flange structure is larger than the diameter of the middle pipe section of the profiled pipe 1), and the tail end of the profiled pipe 1 is a straight circular opening structure with equal diameter (the diameter of the tail end of the profiled pipe 1 is equal to the diameter of the middle pipe section).

[0050] Further, the head end sealing assembly further comprises a first baffle plate 8, which is a disc structure, and the first baffle plate 8 is a hard structure plate. The inner side of the first baffle plate 8 (the side facing the profiled pipe 1) abuts against the flange structure at the head end of the profiled pipe 1, one end of the first sealing member 2 facing the first baffle plate 8 abuts against the inner side of the first baffle plate 8, and one end of the first top block 3 facing the first baffle plate 8 is arranged spaced apart from the first baffle plate 8, so as to provide a space allowance for the movement of the first top block 3 and the first sealing member 2 when they move relatively.

[0051] The air-tight adapter 4 is connected with the first stopper after passing through the first baffle 8, and the air-tight adapter 4 can abut against the outer side of the first baffle 8.

[0052] In order to improve the air-tightness of the application in the testing process, the application sets a first sealing ring between the first baffle 8 and the flange structure at the head end of the profiled pipe fitting 1, and the first sealing ring is an annular rubber ring. The air-tight adapter 4 is provided with a second sealing ring, which is an annular rubber ring. The second sealing ring abuts against the inner side of the first baffle 8 to realize the air-tight connection between the air-tight adapter 4 and the first baffle 8. In order to ensure the stability of the setting of the first sealing ring and the second sealing ring, the application sets a sealing ring mounting groove on the first baffle 8 and corresponding to the positions of the first sealing ring and the second sealing ring.

[0053] For the tail end sealing assembly, the tail end sealing assembly further comprises a second baffle 9 and a third baffle 10. The second baffle 9 is a hard structure plate, and the third baffle is made of the same material as the second stopper and is designed in an integrated structure with the second stopper. Of course, the third baffle can also be a hard structure plate, and the third baffle and the second stopper are fixedly connected through a plurality of screws.

[0054] Specifically, the second baffle 9 is located in the second stopper and abuts against the outer end of the second sealing element 5, the third baffle 10 is fixedly arranged at the outer end of the second stopper, and the connecting piece 7 abuts against the outer side of the second baffle 9 through the third baffle 10. The connecting piece 7 is an ejection bolt, and the connecting piece 7 is threadedly connected with the third baffle 10. By rotating the connecting piece 7, the end of the connecting piece 7 can be pressed against the second baffle 9 to pull the third baffle outward.

[0055] Specifically, the air source connected with the air-tight adapter 4 is a high-pressure gas tank or a gas pump.

[0056] Specifically, the manufacturing material of the first sealing element 2 is silica gel, and the manufacturing material of the second sealing element 5 is silica gel.

[0057] Specifically, the first stopper is a hard structure piece, which can be made of stainless steel, metal aluminum, hard plastic, etc., or can be made of silica gel material. The second stopper is a hard structure piece, which can be made of stainless steel, metal aluminum, hard plastic, etc., or can be made of silica gel material.

[0058] The application further provides a profiled pipe fitting sealing test method, which specifically comprises the following steps:

[0059] Step one, seal the head end and tail end of the special-shaped pipe 1 using the special-shaped pipe sealing test tool as described above. Specifically, the head end sealing assembly and the tail end sealing assembly can be assembled according to the structure described above.

[0060] Step two, press and hold the pressure of the special-shaped pipe 1 through the airtight adapter 4 of the head end sealing assembly (connect the air source directly through the airtight adapter 4, or install a pressure gauge, and then connect the air source through the pressure gauge).

[0061] Step three, detect whether the special-shaped pipe 1 has pressure drop or air leakage phenomenon.

[0062] Specifically, in step one, when installing the first sealing element 2, the contact surfaces of the first sealing element 2, the second sealing element 5, the first top block 3 and the second top block 6 are polished smooth, so as to avoid the presence of foreign matter in the contact between the surfaces and reduce the connection airtightness.

[0063] Specifically, in step two, the pressure gauge is installed on the airtight adapter 4 for pressure measurement. Of course, a valve (such as a ball valve) structure can also be provided to quickly cut off the air source and hold the pressure when the pressure is pressed to the set pressure value.

[0064] Specifically, in step two, the pressure is between 0.15MPa and 0.25MPa, which can be 0.15MPa, 0.18MPa, 0.20MPa, 0.23MPa, 0.25MPa. The holding time is between 10min and 20min, which can be 10min, 12min, 14min, 15min, 16min, 18min, 20min.

[0065] Specifically, in step three, whether the air leakage phenomenon occurs is confirmed by observing whether there are bubbles in the soap water. Of course, after holding the pressure for a period of time, whether the air leakage phenomenon occurs can also be judged by observing whether there is a pressure drop through the pressure gauge.

[0066] The application provides a special-shaped pipe sealing test tool, and a specific use method of the special-shaped pipe sealing test tool is as follows: before use, the contact surface (the contact surface refers to the surface of the component in contact with other components) between the liquid lifting pipe (the special-shaped pipe 1) and the sealing member (including the first sealing member 2 and the second sealing member 5) and the top block (including the first top block 3 and the second top block 6) is polished by using a grinding machine or sandpaper to remove impurities and surface oxide scales; then, the sealing member and the top block are installed, and the sealing ring is installed at the same time; then, the airtight adapter 4 is installed, and the first sealing member 2 and the first top block 3 are tightly combined, during which the first sealing member 2 is deformed outwardly and expanded, and then the first sealing member 2 is tightly attached to form a sealing structure; the second sealing member 5 and the second top block 6 are installed at the tail end of the special-shaped pipe 1, and the ejection screw is installed, the ejection screw is tightened to make the second top block 6 and the second sealing member 5 relatively move, and the second sealing member 5 is tightened; the air pressure gauge is installed on the airtight adapter 4, the air pressure pump is started to pressurize the closed system, and the pressure is maintained after being pressurized to 0.2 MPa; finally, the soap water is applied to the weld of the special-shaped pipe 1 to observe whether there is a bubble, and whether the air leakage phenomenon occurs is determined. The application constructs a sealing system for the liquid lifting pipe with a complex structure, the special-shaped pipe 1 is inflated, the internal and external pressure difference of 0.2 MPa is formed, and the pressure is maintained for 15 minutes, then the bubble observation is performed by applying the soap water to the welded joint surface. If there is a bubble overflow, it indicates that there is a crack at the weld, and the weld needs to be repaired; if there is no bubble overflow, it indicates that the weld has good combination, and the special-shaped pipe 1 can be continuously used. The application utilizes the friction force between the special-shaped sealing silica gel (the first sealing member 2 and the second sealing member 5) and the wall of the liquid lifting pipe, and the extrusion force and the friction force between the tool sliding block (the first top block 3 and the second top block 6) and the special-shaped sealing silica gel, so that the extrusion force between the three is increased, and the sealing effect of the liquid lifting pipe is achieved. The application is suitable for the sealing detection of the cylindrical special-shaped metal component, the extrusion force generated in the structural design and the physical fastening process is used to form strong friction force, and the sealing detection of the special-shaped component is realized, and the method is simple and easy to implement, the implementation efficiency is high, and the implementation process is harmless.

[0067] From the above, the application provides a special-shaped pipe sealing test tool for realizing the sealing test of the special-shaped pipe 1, which comprises a head-end sealing assembly and a tail-end sealing assembly. The head-end sealing assembly is arranged at the head end of the special-shaped pipe 1 and is used to realize the internal sealing of the pipe opening of the special-shaped pipe 1. The head-end sealing assembly comprises a first sealing member 2 with an annular structure, which is arranged in the special-shaped pipe 1. The outer side surface of the first sealing member 2 is in airtight contact with the inner side surface of the pipe opening of the special-shaped pipe 1. In the pressure direction, the inner side surface of the first sealing member 2 is formed with a neck-in structure. The head-end sealing assembly further comprises a first top block 3 arranged in the neck-in structure of the first sealing member 2. The outer side surface of the first top block 3 is in airtight contact with the inner side surface of the first sealing member 2. Airtight adapter 4 is connected between the first sealing member 2 and the first top block 3. In the pressure direction, the airtight adapter 4 can apply a pushing force to the first sealing member 2 in the opposite direction of the pressure direction and apply a pulling force to the first top block 3 in the same direction of the pressure direction. The tail-end sealing assembly is arranged at the tail end of the special-shaped pipe 1 and is used to realize the external sealing of the pipe opening of the special-shaped pipe 1. The tail-end sealing assembly comprises a second sealing member 5 with an annular structure, which is arranged outside the pipe opening of the special-shaped pipe 1. The inner side surface of the second sealing member 5 is in airtight contact with the outer side surface of the special-shaped pipe 1. In the pressure direction, the outer side surface of the second sealing member 5 is a gradually expanding slope structure. The tail-end sealing assembly comprises a second top block 6 with an annular structure, which is sleeved on the outer side of the second sealing member 5. The inner side surface of the second top block 6 is in airtight contact with the outer side surface of the second sealing member 5. The tail-end sealing assembly further comprises a connecting member 7. In the pressure direction, the connecting member 7 can apply a pushing force to the second sealing member 5 in the opposite direction of the pressure direction and apply a pulling force to the second top block 6 in the same direction of the pressure direction. Meanwhile, the application also provides a special-shaped pipe sealing test method, which comprises the following steps: step one, using the special-shaped pipe sealing test tool to seal the head end and tail end of the special-shaped pipe 1; step two, pressing and pressure maintaining the special-shaped pipe 1 through the airtight adapter 4 of the head-end sealing assembly; and step three, detecting whether the special-shaped pipe 1 has pressure drop or air leakage.

[0068] Through the above structure design, the special-shaped pipe sealing test tool can seal both ends of the special-shaped pipe 1. After the special-shaped pipe 1 is sealed, the air leakage of the special-shaped pipe 1 can be detected by pressing, so as to confirm whether the special-shaped pipe 1 has structural defects. After the application is put into use, the structural defects of the special-shaped pipe 1, especially the lift pipe, can be quickly and timely found. The application is a tool assembly suitable for the air tightness detection of special-shaped pipes such as lift pipes, which can regularly detect the air tightness of the components, so as to realize the early detection of defects, improve the quality of castings, and reduce the production cost.

[0069] From the technical common knowledge, the present application can be realized by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are merely exemplary in all aspects and are not the only ones. All changes within the scope of the present application or equivalent to the scope of the present application are intended to be embraced by the present application.

Claims

1. A special-shaped pipe sealing test tool for realizing sealing test of a special-shaped pipe (1), characterized in that, The application relates to a sealing test tool for a profiled pipe, which comprises a head-end sealing assembly arranged at the head end of the profiled pipe and used for realizing internal sealing of the pipe opening of the profiled pipe, a tail-end sealing assembly arranged at the tail end of the profiled pipe and used for realizing external sealing of the pipe opening of the profiled pipe, and a flange structure arranged at the head end of the profiled pipe. The head-end sealing assembly comprises a first sealing member (2) in the form of an annular structure, which is arranged in the profiled pipe and has an outer side in airtight contact with the inner side of the pipe opening of the profiled pipe, and the inner side of the first sealing member is formed with a neck-in structure in the direction of pressure, and the head-end sealing assembly further comprises a first top block (3) arranged in the neck-in structure of the first sealing member, and the outer side of the first top block is in airtight contact with the inner side of the first sealing member, and airtight adapter (4) is connected between the first sealing member and the first top block, and the airtight adapter can apply a pushing force to the first sealing member in the direction opposite to the direction of pressure and apply a pulling force to the first top block in the same direction as the direction of pressure. The tail-end sealing assembly comprises a second sealing member (5) in the form of an annular structure, which is arranged outside the pipe opening of the profiled pipe and has an inner side in airtight contact with the outer side of the profiled pipe, and the outer side of the second sealing member is in the form of a gradually expanding slope structure in the direction of pressure, and the tail-end sealing assembly further comprises a second top block (6) in the form of an annular structure, which is sleeved on the outer side of the second sealing member and has an inner side in airtight contact with the outer side of the second sealing member, and the tail-end sealing assembly further comprises a connecting member (7) which can apply a pushing force to the second sealing member in the direction opposite to the direction of pressure and apply a pulling force to the second top block in the same direction as the direction of pressure. The head end of the profiled pipe is provided with a flange structure, the tail end of the profiled pipe is in the form of an equal-diameter long straight circular opening structure, and the middle section is in the form of an equal-diameter long straight circular pipe structure.

2. The sealing test tool for the profiled pipe according to claim 1, wherein the head-end sealing assembly further comprises a first baffle (8) which is in abutment with the flange structure of the head end of the profiled pipe, and the end of the first sealing member facing the first baffle is in abutment with the inner side of the first baffle, and the end of the first top block facing the first baffle is arranged in a spaced manner with the first baffle. The airtight adapter passes through the first baffle and can be in abutment with the outer side of the first baffle.

3. The sealing test tool for the profiled pipe according to claim 2, wherein a first sealing ring is arranged between the first baffle and the flange structure of the head end of the profiled pipe. A second sealing ring is arranged on the airtight adapter, and the second sealing ring is in abutment with the inner side of the first baffle and used for realizing airtight connection between the airtight adapter and the first baffle.

4. The sealing test tool for the profiled pipe according to claim 3, wherein ​ ​ A sealing ring mounting groove is arranged on the first baffle plate and corresponds to the positions of the first sealing ring and the second sealing ring.

5. The special-shaped pipe sealing test tooling according to claim 1, wherein, The tail end sealing assembly further comprises a second baffle plate (9) and a third baffle plate (10); The second baffle plate is located in the second baffle block and abuts against the outer end of the second sealing member, and the third baffle plate is fixedly arranged at the outer end of the second baffle block, and the connecting member abuts against the outer side surface of the second baffle plate through the third baffle plate.

6. The special-shaped pipe sealing test tooling according to claim 5, wherein, The connecting member is an ejection bolt; The connecting member is threadedly connected with the third baffle plate.

7. The special-shaped pipe sealing test tooling according to claim 1, wherein, A gas source is connected with the airtight adapter; The gas source is a high-pressure gas tank or a gas pump.

8. The special-shaped pipe sealing test tooling according to any one of claims 1 to 7, wherein, The manufacturing material of the first sealing member is silica gel; The manufacturing material of the second sealing member is silica gel.

9. A method of testing a seal of a profiled tube, characterized in that The method comprises: Step one, using the special-shaped pipe sealing test tooling according to any one of claims 1 to 8 to seal the head end and the tail end of the special-shaped pipe; Step two, pressing and maintaining the pressure of the special-shaped pipe through the airtight adapter of the head end sealing assembly; Step three, detecting whether the special-shaped pipe has pressure drop or air leakage phenomenon.

10. The special-shaped pipe sealing test method according to claim 9, wherein, In the step one, when the first sealing member is installed, the contact surfaces of the first sealing member, the second sealing member, the first baffle block and the second baffle block are polished smooth; In the step two, a gas pressure gauge is installed on the airtight adapter for gas pressure measurement; In the step two, the pressing pressure is between 0.15 MPa and 0.25 MPa, and the maintaining time is between 10 min and 20 min; In the step three, whether the air leakage phenomenon occurs is confirmed by observing whether bubbles are generated by applying soap water.

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