Connecting device for whole pipe stretching and sealing test

Abstract

The utility model relates to a connecting device for a whole pipe stretching and sealing test. The connecting device for the whole pipe stretching and sealing test comprises a pipe end connecting piece, a stretching rod and a hook assembly, the pipe end connecting piece is used for being connected to a port of a sample pipe end in a sealed mode, a first connecting hole communicated with a pipe cavity of the sample pipe end is formed in the pipe end connecting piece in a penetrating mode, and the stretching rod penetrates through the first connecting hole and is connected with the hook assembly. One end of the stretching rod is in limiting fit with the pipe end connecting piece and is used for penetrating into the sample pipe end, and the stretching rod is provided with a vent hole used for being communicated with the interior of the sample pipe end. The hook assembly is detachably connected with the other end of the stretching rod and used for being connected to a testing machine. According to the connecting device, the welding requirement is reduced, and the test operation steps are reduced, so that the test operation difficulty is reduced, the test efficiency is improved, and the test cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of whole pipe testing tools, and in particular to a connection device for whole pipe stretching and sealing testing. Background Art

[0002] As the application of polyethylene gas pipelines in the gas industry continues to increase, the demand for polyethylene pipe fittings and steel-plastic conversion fittings is also gradually increasing, and the quality requirements for polyethylene pipe fittings and steel-plastic conversion fittings are also getting higher and higher.

[0003] In the quality inspection of polyethylene pipe fittings and steel-plastic conversion pipe fittings, tensile and sealing performance tests are involved. According to the industry's tensile and sealing performance test requirements, the sample pipe needs to be connected to the testing machine for continuous stretching. The maximum test tensile force of the larger diameter sample pipe exceeds 600kN. In related technologies, it is difficult to connect the sample pipe to the testing machine and the reliability is poor, which prolongs the test operation time and increases the test cost. Summary of the invention

[0004] Based on this, it is necessary to provide a connection device for whole pipe stretching and sealing testing to make the testing operation simpler and more reliable.

[0005] A connecting device for whole tube tensile and sealing testing, used for connecting a sample tube end with a testing machine, the connecting device comprising:

[0006] A tube end connector, the tube end connector is used for sealing connection to the port of the sample tube end, and the tube end connector is provided with a first connection hole for communicating with the tube cavity of the sample tube end;

[0007] A stretching rod, the stretching rod is inserted into the first connecting hole, one end of the stretching rod is limitedly matched with the tube end connector and is used to be inserted into the sample tube end, and the stretching rod is provided with a vent hole for connecting to the sample tube end;

[0008] A hook assembly is detachably connected to the other end of the stretching rod, and the hook assembly is used to be connected to the testing machine.

[0009] The technical solution is further described below:

[0010] In one embodiment, the stretching rod includes a boss section, a connecting section and a mating section, the connecting section connects the boss section and the mating section, the connecting section is inserted into the first connecting hole, the diameter of the boss section is larger than the aperture of the first connecting hole and smaller than the inner diameter of the sample tube end, the boss section is used to be inserted into the sample tube end, and the mating section is inserted from the sample tube end and is detachably connected to the hook assembly.

[0011] In one of the embodiments, the connecting device further comprises a locking member, the locking member is detachably connected to the connecting section, and the locking member is limitedly matched with a side of the pipe end connecting member facing away from the boss section.

[0012] In one embodiment, the locking member is sleeved on the connecting section and threadedly connected to the connecting section; and / or the diameter of the locking member is larger than the aperture of the first connecting hole.

[0013] In one of the embodiments, the connecting device further comprises a sealing ring, and the sealing ring is arranged between the locking member and the pipe end connecting member.

[0014] In one embodiment, the vent hole includes an air inlet and an air outlet, the air inlet passes through the outer peripheral side of the connecting section, and the air outlet passes through the end surface of the boss section.

[0015] In one of the embodiments, the hole wall of the vent hole close to the air inlet is provided with an internal thread for connecting with an air inlet pipe.

[0016] In one embodiment, the hook assembly includes a connector and a latch member, one end of the connector is provided with a receiving cavity for the mating section to pass through, and the other end is provided with a second connecting hole for connecting to a testing machine; the side wall of the connector is also provided with an avoidance opening connected to the receiving cavity, and the latch member is inserted into the avoidance opening and limitedly cooperates with the mating section.

[0017] In one embodiment, the mating section includes a large diameter section and a small diameter section, the small diameter section is connected between the connecting section and the large diameter section, the diameter of the large diameter section is larger than the diameter of the small diameter section, the latch member includes a first pin and a second pin arranged at intervals, and a connecting portion connected between the first pin and the second pin, the first pin and the second pin are inserted into the avoidance opening, the first pin, the second pin and the connecting portion are combined to form a limiting groove for accommodating the small diameter section, and the spacing between the first pin and the second pin is smaller than the diameter of the large diameter section.

[0018] In one embodiment, the tube end connector includes a connecting plate, which is sealingly connected to the port of the sample tube end, and the first connecting hole passes through both sides of the connecting plate; or, the tube end connector includes a tube cap, which is connected to the end of the sample tube end, and the first connecting hole passes through both sides of the tube cap.

[0019] When the above-mentioned connecting device is in use, the stretching rod is first inserted into the first connecting hole, and then the tube end connecting piece is sealed and connected to the port of the sample tube end, so that one end of the stretching rod extends into the sample tube end and cooperates with the tube end connecting piece to limit the position, and then the hook assembly is connected to the other end of the stretching rod, and then the hook assembly is connected to the testing machine, so that the connection and fixation of the sample tube and the testing machine can be achieved. At this time, the sample tube can be tensile tested. Compared with the traditional solution that requires welding of blind plates and lifting ears, the stretching rod of the connecting device of the present application does not require welding between the stretching rod and the tube end connecting piece and between the stretching rod and the hook assembly, which reduces the welding operation requirements and thus reduces the operation difficulty. Compared with the traditional method of processing an iron core that matches the inner diameter of the sample tube end and using a large hydraulic wedge-shaped clamp to clamp and fix, the connection device of the present application cooperates with the tube end connector through the stretch rod, so that the stretch rod does not need to strictly match the inner diameter of the sample tube end. The same specification of the stretch rod can be used for multiple specifications of sample tube ends and can be reused. It has a wide range of tube diameters, improves the versatility of the connection device, reduces the difficulty of sample tube preparation, and reduces the processing requirements of stretch welding, thereby reducing the difficulty of test operations and greatly reducing the cost of test equipment. At the same time, by opening a vent hole in the stretch rod, the vent hole can be directly used to ventilate the sample tube end, so that the sealing performance of the sample tube end can be directly tested after the stretch test, without the need for other connection tools and assembly operations, reducing the test operation steps, improving the test efficiency, and reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0023] FIG. 1 is a schematic structural diagram of a connecting device according to an embodiment.

[0024] FIG. 2 is a schematic structural diagram of a stretching rod according to an embodiment.

[0025] FIG. 3 is a schematic structural diagram of a connector according to an embodiment.

[0026] FIG. 4 is a left side view of the connector shown in FIG. 3 .

[0027] FIG. 5 is a right side view of the connector shown in FIG. 3 .

[0028] FIG. 6 is a schematic structural diagram of a latch member according to an embodiment.

[0029] FIG. 7 is a schematic structural diagram of a locking member according to an embodiment.

[0030] FIG. 8 is a schematic structural diagram of a sealing ring according to an embodiment.

[0031] Description of reference numerals:

[0032] 10. stretching rod; 11. boss section; 12. connecting section; 13. matching section; 131. small diameter section; 132. large diameter section; 14. vent; 20. hook assembly; 21. connector; 211. accommodating cavity; 212. second connecting hole; 213. avoidance opening; 22. latch member; 221. first pin; 222. second pin; 223. connecting portion; 224. limiting groove; 30. tube end connector; 40. locking member; 50. sealing ring; 60. sample tube end. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] As described in the background technology, the connection between the sample tube end and the testing machine is difficult and the reliability is poor, which prolongs the test operation time and increases the test cost. Specifically, the commonly used test method is to weld a blind plate at the end of the steel pipe and weld a lifting lug at the center of the blind plate, and then connect the lifting lug to the fixture of the testing machine. Or a matching iron core is inserted into the port end of the polyethylene tube, and a large tonnage fixture is clamped at one end of the iron core, and then the large tonnage fixture is connected to the testing machine. However, the former requires the selection of a blind plate with a suitable wall thickness, the processing of the lifting lug and skilled and reliable welding operations, and requires that each sample tube end 60 ends are welded with corresponding lifting lugs, and there is often a problem that the size of the welding lifting lug does not match the size of the fixture interface of the testing machine, and the welding lifting lug is pulled off due to the poor quality of the fillet welding, so the processing size of the lifting lug requires a high recognition ability and welding operation ability of the processor. The latter requires processing an iron core that matches the inner diameter of the polyethylene tube end. If the iron core is too large, it cannot be inserted into the polyethylene tube and is difficult to take out and reuse. If the iron core is too small, it cannot stretch the polyethylene tube and requires a stretching fixture of sufficient tonnage, which occupies a large space in the stretching machine and increases the test cost. In addition, after the stretching is completed, another connection tool needs to be replaced for sealing testing, which is cumbersome.

[0040] Based on this, an embodiment of the present application provides a connection device for whole tube stretching and sealing test, the connection device is used to connect the sample tube end 60 with the test machine, wherein the sample tube end 60 includes a pipe fitting such as a steel tube or a polyethylene tube. Specifically, referring to FIG1 , the connection device of an embodiment includes a tube end connector 30, a stretching rod 10, and a hook assembly 20, wherein the tube end connector 30 is used to seal and connect to the port of the sample tube end 60, the tube end connector 30 is provided with a first connection hole connected to the tube cavity of the sample tube end 60, the stretching rod 10 is penetrated in the first connection hole, and one end of the stretching rod 10 is limitedly matched with the tube end connector 30 and is used to penetrate into the sample tube end 60, and the stretching rod 10 is provided with a vent hole 14 for connecting to the inside of the sample tube end 60. The hook assembly 20 is detachably connected to the other end of the stretching rod 10, and the hook assembly 20 is used to connect to the test machine.

[0041] When the above-mentioned connecting device is in use, the stretching rod 10 is first inserted into the first connecting hole, and then the tube end connector 30 is sealed and connected to the port of the sample tube end 60, so that one end of the stretching rod 10 extends into the sample tube end 60 and cooperates with the tube end connector 30 to limit the position, and then the hook assembly 20 is connected to the other end of the stretching rod 10, and then the hook assembly 20 is connected to the testing machine, so that the connection and fixation of the sample tube end 60 and the testing machine can be achieved. At this time, the sample tube end 60 can be tensile tested. Compared with the traditional solution that requires welding of blind plates and lifting ears, the stretching rod 10 of the connecting device of the present application does not require welding with the tube end connector 30 and the hook assembly 20, which reduces the welding operation requirements and thus reduces the operation difficulty. Compared with the traditional method of processing an iron core that matches the inner diameter of the sample tube end 60 and clamping and fixing with a large hydraulic wedge-shaped clamp, the connection device of the present application is limited by the stretch rod 10 and the tube end connector 30, so that the stretch rod 10 does not need to strictly match the inner diameter of the sample tube end 60, and the same specification of the stretch rod 10 can be used for multiple specifications of the sample tube end 60 and can be reused, with a wide range of tube diameters. The versatility of the connection device is improved, the difficulty of sample tube preparation is reduced, and the processing requirements of stretch welding are reduced, thereby reducing the difficulty of test operations and greatly reducing the cost of test equipment. At the same time, by opening a vent hole 14 in the stretch rod 10, the vent hole 14 can be directly used to ventilate the sample tube end 60, so that the sealing performance test of the sample tube end 60 can be directly performed after the tensile test, without the need for other connection tools and assembly operations, reducing the test operation steps, improving the test efficiency, and reducing the test cost.

[0042] Referring to FIG. 2 , in one embodiment, the stretching rod 10 includes a boss section 11, a connecting section 12, and a matching section 13. The connecting section 12 connects the boss section 11 and the matching section 13. The connecting section 12 is inserted into the first connecting hole. The diameter of the boss section 11 is larger than the aperture of the first connecting hole and smaller than the inner diameter of the sample tube end 60. The boss section 11 is used to be inserted into the sample tube end 60. In this way, the tube end connector 30 can limit the boss section 11 in the sample tube end 60 to prevent the stretching rod 10 from being separated from the sample tube end 60. Furthermore, the matching section 13 passes through the sample tube end 60 and is detachably connected to the hook assembly 20, so that the stretching rod 10 can be connected to the testing machine through the hook assembly 20.

[0043] 1 and 7 , the connection device further includes a locking member 40 , which is detachably connected to the connection section 12 and is limitedly engaged with a side of the tube end connector 30 away from the boss section 11 , thereby preventing the stretching rod 10 from falling into the sample tube end 60 .

[0044] Optionally, in one embodiment, the locking member 40 is a nut, and the locking member 40 is sleeved on the connecting section 12 and is threadedly connected to the connecting section 12. Furthermore, the diameter of the locking member 40 is larger than the aperture of the first connecting hole. In this way, by tightening the locking member 40 so that the locking member 40 and the tube end connector 30 are away from the side of the boss section 11, the stretching rod 10 can be locked to prevent the stretching rod 10 from falling into the sample tube end 60. At the same time, the boss section 11 is abutted against the other side of the tube end connector 30, so that the stretching rod 10 can be axially limited to prevent the stretching rod 10 from shaking during the stretching process. By loosening the locking member 40, the locking member 40 can be taken out from the end of the stretching rod 10 away from the boss section 11, and then the stretching rod 10 can be taken out from the tube end connector 30.

[0045] 1 and 7 , the connection device further includes a sealing ring 50, which is disposed between the locking member 40 and the tube end connector 30. The sealing ring 50 can seal the gap between the locking member 40 and the tube end connector 30, thereby ensuring the sealing between the connection device and the sample tube end 60 in the sealing test and ensuring the sealing effect. Preferably, the sealing ring 50 can be a silicone gasket, the inner diameter of the sealing ring 50 is closely matched to the outer diameter of the connection section 12, and the outer diameter of the sealing ring 50 is matched to the inner diameter of the sample tube end 60.

[0046] Referring to FIG. 2 , the vent hole 14 includes an air inlet and an air outlet. The air inlet passes through the outer peripheral side of the connecting section 12, and the air outlet passes through the end face of the boss section 11, so as to facilitate the connection of the air inlet pipe (not shown) from the outer peripheral side of the connecting section 12, without affecting the connection between the tensile mechanism of the testing machine and the connecting device. Furthermore, the hole wall of the vent hole 14 near the air inlet is provided with an internal thread for connecting with the air inlet pipe. The vent hole 14 cooperates with the air inlet pipeline thread, so as to facilitate the connection and disassembly of the air inlet pipe, further simplify the test steps, and improve the test efficiency.

[0047] Further, referring to FIG. 3 and FIG. 5 , the hook assembly 20 includes a connector 21 and a latch 22. One end of the connector 21 is provided with a receiving cavity 211 for the mating section 13 to penetrate, and the other end is provided with a second connection hole 212 for connecting the test machine. The side wall of the connector 21 is also provided with a avoidance opening 213 connected to the receiving cavity 211. The latch 22 is inserted into the avoidance opening 213 and is limitedly matched with the mating section 13. In this way, when connecting, the mating section 13 of the stretching rod 10 is first inserted into the receiving cavity 211, and then the latch is inserted into the avoidance opening 213, and the latch is timely engaged and fixed with the mating section 13, so that the connector 21 and the stretching rod 10 can be connected and fixed, and finally the stretching mechanism of the test machine is connected to the second connection hole 212, so that the connection of the sample tube end 60 and the test machine can be realized. Specifically, the stretching rod 10 can be a cylindrical structure, and the connector 21 can be a cylindrical or square main body structure.

[0048] Referring to FIG. 2 , in one embodiment, the mating section 13 includes a large diameter section 132 and a small diameter section 131. The small diameter section 131 is connected between the connecting section 12 and the large diameter section 132. The diameter of the large diameter section 132 is larger than the diameter of the small diameter section 131, so that a step-limiting structure is formed between the large diameter section 132 and the small diameter section 131. In conjunction with FIG. 6 , the latch member 22 includes a first plug pin 221 and a second plug pin 222 arranged at intervals, and a connecting portion 223 connected between the first plug pin 221 and the second plug pin 222. The first plug pin 221 and the second plug pin 222 are inserted into the avoidance opening 213. The first plug pin 221, the second plug pin 222 and the connecting portion 223 enclose a limiting groove 224 for accommodating the small diameter section 131. The spacing between the first plug pin 221 and the second plug pin 222 is smaller than the diameter of the large diameter section 132. Specifically, the latch member 22 has a U-shaped structure. When connected, the first pin 221 and the second pin 222 are inserted into the avoidance opening 213, and the small diameter section 131 is accommodated in the accommodating groove between the first pin 221 and the second pin 222. Since the distance between the first pin 221 and the second pin 222 is smaller than the diameter of the large diameter section 132, the mating member can be limited in the accommodating cavity 211 of the connector 21 to prevent the stretching rod 10 from slipping out of the connector 21.

[0049] Optionally, in one embodiment, the tube end connector 30 includes a connecting plate, which is sealingly connected to the port of the sample tube end 60, and the first connecting hole runs through both sides of the connecting plate. Specifically, the first connecting hole can be first opened on the connecting plate, and then the connecting plate can be welded or bonded to the port of the sample tube end 60, so as to achieve a sealed connection between the connecting plate and the sample tube end 60.

[0050] In another embodiment, the tube end connector 30 may also be a tube cap, which is connected to the end of the sample tube end 60, and the first connection hole runs through both sides of the tube cap. Specifically, the tube cap is threadedly connected to the sample tube end 60, so as to facilitate installation or removal of the tube cap.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A connection device for whole tube tensile and sealing testing, used to connect the sample tube end with a testing machine, characterized in that: The connecting device comprises: A tube end connector, the tube end connector is used for sealing connection to the port of the sample tube end, and the tube end connector is provided with a first connecting hole extending therethrough; A stretching rod, the stretching rod is inserted into the first connecting hole, one end of the stretching rod is limitedly matched with the tube end connector and is used to be inserted into the sample tube end, and the stretching rod is provided with a vent hole for connecting to the sample tube end; A hook assembly is detachably connected to the other end of the stretching rod, and the hook assembly is used to be connected to the testing machine.

2. The connection device for whole pipe tensile and sealing testing according to claim 1, characterized in that: The stretching rod includes a boss section, a connecting section and a matching section, wherein the connecting section connects the boss section and the matching section, the connecting section is inserted into the first connecting hole, the diameter of the boss section is larger than the aperture of the first connecting hole and smaller than the inner diameter of the sample tube end, the boss section is used to be inserted into the sample tube end, and the matching section is inserted from the sample tube end and is detachably connected to the hook assembly.

3. The connection device for whole pipe tensile and sealing testing according to claim 2, characterized in that: The connecting device further comprises a locking member, which is detachably connected to the connecting section and is limitedly matched with a side of the pipe end connecting member which is away from the boss section.

4. The connection device for whole pipe tensile and sealing testing according to claim 3, characterized in that: The locking piece is sleeved on the connecting section and threadedly connected with the connecting section; and / or the diameter of the locking piece is larger than the hole diameter of the first connecting hole.

5. The connection device for whole pipe tensile and sealing testing according to claim 3, characterized in that: The connecting device further comprises a sealing ring, which is arranged between the locking member and the pipe end connecting member.

6. The connection device for whole pipe tensile and sealing testing according to claim 2, characterized in that: The vent hole includes an air inlet and an air outlet, wherein the air inlet passes through the outer peripheral side of the connecting section, and the air outlet passes through the end surface of the boss section.

7. The connection device for whole pipe tensile and sealing testing according to claim 6, characterized in that: The hole wall of the vent hole close to the air inlet is provided with an internal thread for connecting with an air inlet pipe.

8. The connection device for whole pipe tensile and sealing testing according to claim 2, characterized in that: The hook assembly includes a connector and a latch member, one end of the connector is provided with a receiving cavity for the mating section to pass through, and the other end is provided with a second connecting hole for connecting to the testing machine; the side wall of the connector is also provided with an avoidance opening connected to the receiving cavity, and the latch member is inserted into the avoidance opening and limitedly cooperates with the mating section.

9. The connection device for whole pipe tensile and sealing testing according to claim 8, characterized in that: The mating section includes a large diameter section and a small diameter section, the small diameter section is connected between the connecting section and the large diameter section, the diameter of the large diameter section is larger than the diameter of the small diameter section, the latch member includes a first pin and a second pin arranged at intervals, and a connecting portion connected between the first pin and the second pin, the first pin and the second pin are inserted into the avoidance opening, the first pin, the second pin and the connecting portion are enclosed to form a limiting groove for accommodating the small diameter section, and the spacing between the first pin and the second pin is smaller than the diameter of the large diameter section.

10. The connecting device for whole pipe tensile and sealing testing according to any one of claims 1 to 9, characterized in that: The tube end connector includes a connecting plate, which is sealingly connected to the port of the sample tube end, and the first connecting hole runs through both sides of the connecting plate; or, the tube end connector includes a tube cap, which is connected to the end of the sample tube end, and the first connecting hole runs through both sides of the tube cap.

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