Metal tube expansion performance detection device and method

Abstract

The present invention relates to the field of metal pipe inspection, and specifically discloses a metal pipe expansion performance inspection device and method, wherein the device includes a performance inspection structure, the performance inspection structure includes a fixed sorting component, a detection component and a storage box with qualified areas and unqualified areas, the fixed sorting component is used to fix the metal pipe body and sort the metal pipe body into the storage box, the detection component is installed on the storage box and is used to inspect the port of the metal pipe body; wherein the fixed sorting component includes a blanking mechanism and a clamping plate, the blanking mechanism is arranged above the opening of the storage box, and is used to support and drop the metal pipe body; the purpose of the present invention is to solve the problem in the prior art that qualified and unqualified metal pipes cannot be sorted after the metal pipes are expanded, which leads to increased costs and reduced efficiency in the overall production process of the metal pipe expansion.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe performance detection, and in particular to a metal pipe expansion performance detection device and method. Background Art

[0002] With the increasing demand for metal pipe fittings in modern industry, metal pipes are widely used in aerospace, automobile manufacturing, petrochemical and other fields. The sealing and reliability of their connection parts directly affect the safety and performance of the entire system. As an important process for metal pipe connection, the quality of the flaring performance is crucial. Traditional metal pipe flaring performance testing mainly relies on manual experience and judgment, and has problems such as low detection efficiency, strong subjectivity, and large errors in test results. In addition, some existing detection devices have complex structures and poor adaptability, making it difficult to meet the precise detection needs of metal pipes of different specifications. Therefore, the development of an efficient, accurate and adaptable metal pipe flaring performance detection device and method has become an urgent problem to be solved to ensure the quality of metal pipes and the safe and stable operation of industrial production.

[0003] The invention patent with application number: CN202210266546.6 and publication number: CN114350920A (hereinafter referred to as "prior art 1") discloses an apparatus and a production process for improving the ability of metal pipes to resist flaring and bending deformation, belonging to the field of metal pipe technology. The clamping mechanism includes a base plate and a first fixed plate fixedly connected to both sides of the top of the base plate. The clamping mechanism also includes a first drive assembly, a clamping assembly and a heating assembly. The first drive assembly includes a double-headed motor embedded in the first fixed plate on the left side of the top of the base plate. The inner output end of the double-headed motor is fixedly connected to a drive rod, and the other end of the drive rod is rotatably connected to the first fixed plate on the right side of the top of the base plate. The material is unloaded by a unloading mechanism. After annealing, the hardness and stress at both ends of the metal pipe are reduced;

[0004] The specification of prior art 1 discloses an equipment and production process for improving the ability of metal pipes to resist flaring and bending deformation. When in use, the two ends of the metal pipe are heated internally and externally to make both ends austenitized. After half an hour of temperature stabilization, the temperature is slowly lowered to room temperature, thereby reducing the hardness of the two ends of the metal pipe body, which can effectively prevent the flaring from cracking during flaring or installation. This just shows that when the metal pipe is flared, it is inevitable that the metal pipe will cause cracking at the end position of the metal pipe after flaring. Prior art 1 uses heating to soften the end of the metal pipe and thus not easily crack. However, this does not mean that after using the method of prior art 1, no metal pipe will crack, and the fact that the end of the metal pipe is not cracked does not mean that the performance of the metal pipe is qualified. Therefore, although prior art 1 can prevent the cracking of the metal pipe, it cannot guarantee that the performance of the metal pipe that has not cracked is qualified, and it is also impossible to sort unqualified and qualified metal pipes. Using manual sorting will lead to increased production costs and reduced production efficiency. Summary of the Invention

[0005] The present invention provides a device and method for detecting the expansion performance of metal tubes, aiming to solve the problem in the prior art that, after expansion, qualified and unqualified metal tubes cannot be sorted, thereby resulting in increased costs and reduced efficiency in the overall production process of metal tube expansion.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A metal tube flaring performance testing device includes a performance testing structure, the performance testing structure including a fixed sorting component, a testing component, and a storage box having qualified areas and unqualified areas. The fixed sorting component is used to fix the metal tube body and sort the metal tube body into the storage box. The testing component is installed on the storage box and is used to test the end of the metal tube body.

[0008] Among them, the fixed sorting component includes a blanking mechanism and a splint. The blanking mechanism is arranged above the opening on the storage box and is used to support and drop the metal tube body. A first cylinder is provided on both sides of the blanking mechanism. The splint is provided at the movable end of the first cylinder and is used to fix the metal tube body on the blanking mechanism.

[0009] Furthermore, the blanking mechanism includes a support frame and a support plate. The support frame is installed above the opening position of the storage box. There are two support plates, which are hinged to the support frame. The two support plates have opposite rotation directions. A second cylinder is hinged to the bottom of each support plate. The movable end of the second cylinder is hinged to the support plate, and the fixed end of the second cylinder is hinged to the support frame.

[0010] Furthermore, a guide rod is slidingly arranged on the support frame, one end of the guide rod is connected to the splint, and the other end is slidingly connected to the support frame. A pressure sensor is arranged on the end face of the splint, and the pressure sensor is used to contact the outer wall of the metal tube body and is connected to the second cylinder through the controller.

[0011] Furthermore, a transport channel is provided above the support frame, and a metal tube flaring structure is connected to one end of the transport channel away from the support frame. The metal tube flaring structure is used to flare the port of the metal tube body and then transport it to the two closed support plates on the support frame through the transport channel.

[0012] Furthermore, a baffle is provided inside the storage box, which divides the storage box into the qualified area and the unqualified area, and the baffle is located in the middle of the support frame.

[0013] Furthermore, the detection assembly includes a mounting tube, a slip ring structure, a distance sensor, a motor and an adjustment mechanism. The mounting tube is slidably mounted on the storage box through a sliding mechanism, the slip ring structure is rotatably mounted inside the storage box, and a limiting mechanism is used to prevent the slip ring from moving back and forth. There are several distance sensors, and several distance sensors are slidably mounted on the slip ring structure through the adjustment mechanism. The sliding stroke of the distance sensor coincides with a line connecting the edge of the mounting tube cross section to the center of the mounting tube cross section. The fixed end of the motor is set on the mounting tube, and the movable end is used to drive the slip ring structure to rotate on the inner wall of the mounting tube.

[0014] Furthermore, the slip ring structure includes a sliding ring and a mounting bucket. The sliding ring and the mounting bucket are connected by several connecting rods to form an integrated structure. The sliding ring is slidably installed on the inner wall of the mounting cylinder through the limiting mechanism. The adjusting mechanism is arranged on the mounting bucket, and the output shaft of the motor is fixedly connected to the mounting bucket.

[0015] Furthermore, the adjustment mechanism includes a screw, a threaded hole is provided on the installation bucket, the screw is threadedly installed on the threaded hole, and a rotating protrusion is provided on the outer surface of the distance sensor, and the rotating protrusion is connected to the screw for damping rotation.

[0016] Furthermore, the end of the installation bucket has a cylinder, the cylinder is connected to the inner wall of the installation bucket, the output shaft of the motor is fixedly connected to the cylinder, and a wiring hole is provided on the cylinder, which is used to make way for the cable on the distance sensor.

[0017] Furthermore, the present invention also includes a method for detecting the performance of metal tube expansion, the performance detection method comprising the following steps:

[0018] S1: Preliminary inspection of the flaring position of the metal tube body:

[0019] S101: When the metal tube body reaches the support plate and the outer wall of the metal tube body contacts the support plate, the first cylinder is driven to extend and the position of the metal tube body is fixed by the clamping plate;

[0020] S102: Adjusting the position of the installation cylinder so that the center of the installation cylinder corresponds to the center of the metal tube body;

[0021] S103: Adjust the position of the distance sensors by means of a screw, so that the distance sensors are synchronously moved toward or away from the center of the cross section of the mounting tube, until the lasers emitted by the distance sensors are all able to illuminate the end face with the largest inner diameter after the expansion of the qualified metal tube body, and then stop rotating the screw;

[0022] S104: After turning on a plurality of distance sensors, the motor starts to control the slip ring structure to drive the plurality of distance sensors to rotate, and the reading on the laser amplifier is used to observe the change in the value of the distance sensor irradiated on the end surface of the metal tube body;

[0023] S1041: After the motor rotates, if the readings on each laser amplifier fluctuate significantly, it indicates that there is a crack on the metal tube body;

[0024] S1042: At this time, the distance sensor controls the first cylinder above the qualified area to extend through the controller, and controls the first cylinder above the unqualified area to retract. At this time, the metal tube body is located above the unqualified area.

[0025] S1043: Then, the second cylinder below the support plate is controlled to retract. At this time, the two support plates are opened, and the support frame is hollow. At the same time, the first cylinders on both sides are controlled to retract. At this time, the metal tube body is no longer clamped by the clamping plates and falls into the unqualified area.

[0026] S1044: If the readings on each laser amplifier fluctuate slightly, it indicates that the metal tube body has passed the preliminary inspection. S1045: At this time, the distance sensor controls the first cylinder above the unqualified area to extend through the controller, and controls the first cylinder above the qualified area to retract. At this time, the metal tube body is located above the qualified area.

[0027] S1046: Then, the second cylinder below the support plate is controlled to retract. At this time, the two support plates are opened, and the support frame is hollow. At the same time, the first cylinders on both sides are controlled to retract. At this time, the metal tube body is no longer clamped by the clamping plates and falls into the qualified area.

[0028] S105: Repeat the above steps S101-S1046, and finally process the unqualified metal tube bodies and collect the preliminarily qualified metal tube bodies;

[0029] S2: Depth detection of the flaring position of the metal tube body is performed using the following formula:

[0030]

[0031] in,

[0032] represents the intensity factor;

[0033] It is expressed as the measured burst pressure after the metal tube is expanded;

[0034] Expressed as the rated working pressure required by design;

[0035] represents the deformation attenuation term;

[0036] It is the abbreviation of Exponential Function, which means the natural constant.

[0037] Expressed as the maximum diameter deviation of the flared section;

[0038] Expressed as the original diameter of the metal tube;

[0039] Expressed as the dimensionless coefficient of material plasticity;

[0040] represents the sealing effectiveness term;

[0041] Expressed as the leak rate measured by helium mass spectrometer leak detection;

[0042] Expressed as the maximum leakage allowed by the standard;

[0043] Expressed as a dimensionless temperature correction coefficient, ,in is the operating temperature change;

[0044] The steps for collecting the above data are as follows:

[0045] S201: According to ISO 1179 standard, the metal pipe body is pressurized by the air pressure burst tester until the pipe breaks, and the peak pressure is measured by the sensor. Recorded and rated Calculate the intensity factor term;

[0046] S202: Scan the expanded end of the metal tube body with a three-dimensional laser scanner, obtain the expanded data of the metal tube body and record it, and calculate the maximum diameter deviation of the expanded end of the metal tube body, ΔD=|D max -D desig n|

[0047] Among them, D max Represents the maximum diameter of the metal tube body at the end; D design Represents the actual diameter size of the metal tube body at the end;

[0048] S203: Use digital calipers to measure the original diameter Take measurements and record them;

[0049] S204: Through specific materials Value, calculate the deformation attenuation term;

[0050] S205: After sealing both ends of the metal tube body, perform vacuum treatment, then inject helium into the vacuum cavity formed by the metal tube body and detect the helium leakage rate , and record it, where Determined according to specific industry standards, is a fixed value;

[0051] S206: Use a temperature cycle box to simulate the working temperature, and calculate the temperature change through the maximum and minimum temperatures inside the temperature cycle box. The formula is: , calculate , and substitute into the formula: In, calculate ;

[0052] in, Indicates the maximum temperature inside the temperature cycle box. Indicates the lowest temperature inside the temperature cycle box;

[0053] S207: Substitute the recorded values ​​and fixed values ​​into the above After calculating the formula, we get The value of

[0054] S208: Repeat the above steps S201-S207 to test different metal tube bodies, record the data, and evaluate the performance of the metal tube bodies according to the evaluation criteria. The metal pipe bodies of different values ​​are classified and The metal pipe bodies of different values ​​are distributed to different fields for application.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention mainly includes a performance detection structure; in actual use, the staff simultaneously extends the first cylinders at both ends of the blanking mechanism to clamp the metal tube body after the hole is expanded on the blanking mechanism. At this time, the outer surface of the metal tube body contacts the clamping plates on both sides and the blanking mechanism below respectively, and then the end face of the expanded position of the metal tube body is detected by the detection component. When the detected metal tube body is unqualified, the first cylinder above the qualified area is controlled to extend, and the first cylinder above the unqualified area is controlled to contract. At this time, the metal tube body is located above the unqualified area, and then the blanking mechanism is controlled to open, the blanking mechanism is hollow, and the first cylinders on both sides are controlled to contract. At this time, the metal tube body is no longer clamped by the clamping plates and falls into the unqualified area. ; If the tested metal tube body is qualified, the first cylinder above the unqualified area is controlled to extend, and the first cylinder above the qualified area is controlled to contract. At this time, the metal tube body is located above the qualified area; then the blanking mechanism is controlled to open, the blanking mechanism is hollow, and the first cylinders on both sides are controlled to contract. At this time, the metal tube body is not clamped by the splint and falls into the qualified area; and then the sorting of the metal tube body is completed. The advantage of this arrangement is that the splint and the first cylinder can not only fix the metal tube body, but also complete the sorting of the metal tube body. The same set of components is used to achieve two purposes. This arrangement avoids manual sorting, reduces the labor cost in the production process of expanding the metal tube body, and improves the efficiency of sorting. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 This is one of the structural diagrams of the present invention.

[0059] Figure 2 This is the second structural diagram of the present invention.

[0060] Figure 3 This is the third structural diagram of the present invention.

[0061] Figure 4 This is one of the structural schematic diagrams of the metal tube expansion structure in the present invention.

[0062] Figure 5 This is the second structural diagram of the metal tube expansion structure in the present invention.

[0063] Figure 6 For the present invention Figure 2 A partial enlarged view of point A in the middle.

[0064] Figure 7 For the present invention Figure 5 A partial enlarged view of point B in the middle.

[0065] Figure 8 For the present invention Figure 1 A partial enlarged view of point C in the middle.

[0066] Figure 9 It is a schematic cross-sectional structural diagram of the sliding mechanism in the present invention.

[0067] Figure 10 1 is a table of experimental data in an embodiment of the present invention.

[0068] In the figure, 101-storage box, 102-metal tube body, 103-plywood, 104-first cylinder, 105-support frame, 106-support plate, 107-second cylinder, 108-guide rod, 109-transport channel, 110-baffle, 111-installation cylinder, 112-distance sensor, 113-motor, 114-sliding ring, 115-installation bucket, 116-screw, 117-limiting protrusion, 118-rotating protrusion, 119-cylinder, 120-wiring hole, 121-working Table, 122-mounting frame, 123-third cylinder, 124-expanding cone, 125-support block, 126-placement groove, 127-limit plug, 128-feeding rack, 129-fourth cylinder, 130-feeding insert plate, 131-fixing plate, 132-fifth cylinder, 133-pressing block, 134-allowing groove, 135-guide slope, 136-unloading rack, 137-unloading plate, 138-base, 139-slide rod, 140-positioning bolt, 141-slide hole, 142-limiting groove. DETAILED DESCRIPTION

[0069] The present invention will be further described below in conjunction with the embodiments. The embodiments described are only some embodiments of the present invention and are not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0070] See also Figures 1-8 As shown, this embodiment discloses a metal tube flaring performance testing device, including a performance testing structure, which includes a fixed sorting component, a testing component, and a storage box 101 having a qualified area and an unqualified area. The fixed sorting component is used to fix the metal tube body 102 and sort the metal tube body 102 into the storage box 101. The testing component is installed on the storage box 101 and is used to test the end of the metal tube body 102.

[0071] Among them, the fixed sorting component includes a blanking mechanism and a splint 103. The blanking mechanism is arranged above the opening on the storage box 101, and is used to support and blank the metal tube body 102. A first cylinder 104 is provided on both sides of the blanking mechanism. The splint 103 is provided at the movable end of the first cylinder 104 and is used to fix the metal tube body 102 on the blanking mechanism.

[0072] The present invention mainly includes a performance detection structure; in actual use, the staff simultaneously extends the first cylinders 104 at both ends of the blanking mechanism to clamp the metal tube body 102 after the hole is expanded on the blanking mechanism. At this time, the outer surface of the metal tube body 102 contacts the clamping plates 103 on both sides and the blanking mechanism below respectively, and then the end face of the expanded position of the metal tube body 102 is detected by the detection component. When the detected metal tube body 102 is unqualified, the first cylinder 104 above the qualified area is controlled to extend, and the first cylinder 104 above the unqualified area is controlled to contract. At this time, the metal tube body 102 is located above the unqualified area, and then the blanking mechanism is controlled to open, the blanking mechanism is hollow, and the first cylinders 104 on both sides are controlled to contract. At this time, the metal tube body 102 is no longer clamped by the clamping plates 103 and falls into the unqualified area. If the tested metal tube body 102 is qualified, the first cylinder 104 above the unqualified area is controlled to extend, and the first cylinder 104 above the qualified area is controlled to contract. At this time, the metal tube body 102 is located above the qualified area; then the blanking mechanism is controlled to open, the blanking mechanism is hollow, and the first cylinders 104 on both sides are controlled to contract. At this time, the metal tube body 102 is not clamped by the clamping plate 103 and falls into the qualified area; then the sorting of the metal tube body 102 is completed. The advantage of this arrangement is that the clamping plate 103 and the first cylinder 104 can not only complete the fixation of the metal tube body 102, but also complete the sorting of the metal tube body 102, using the same set of components and achieving two purposes. This arrangement avoids manual sorting, reduces the labor cost in the production process of expanding the metal tube body 102, and improves the efficiency of sorting.

[0073] See also Figures 1-8 As shown, in some embodiments, the blanking mechanism includes a support frame 105 and a support plate 106. The support frame 105 is installed above the opening position of the storage box 101. There are two support plates 106. The two support plates 106 are hinged on the support frame 105. The rotation directions of the two support plates 106 are opposite. The bottom of each support plate 106 is hinged with a second cylinder 107. The movable end of the second cylinder 107 is hinged to the support plate 106, and the fixed end of the second cylinder 107 is hinged to the support frame 105.

[0074] In actual use, when the blanking mechanism is working, first, the support frame 105 is a U-shaped frame structure, with two support plates 106. The two support plates 106 are rotatably mounted on the support frame 105 through a rotating rod, and the support frames 105 are arranged opposite each other. When the second cylinder 107 is extended, the second cylinders 107 on both sides push the support plates 106, so that the two support plates 106 rotate on the support frame 105, thereby forming a groove-like structure between the two support plates 106 and the support frame 105, so as to support the metal tube body 102. When the detection component is completed, the second cylinder 107 is controlled to retract. After the second cylinder 107 retracts, it drives the two support plates 106 to rotate in opposite directions, thereby making the support frame 105 no longer a groove-like structure, and the metal tube body 102 then falls from the support frame 105 into the storage box 101 for storage. The advantage of this arrangement is that it is convenient for temporarily storing the metal tube body 102 and at the same time convenient for sorting the metal tube body 102.

[0075] See also Figures 1-8 As shown, in some embodiments, a guide rod 108 is slidably provided on the support frame 105, one end of the guide rod 108 is connected to the splint 103, and the other end is slidably connected to the support frame 105, and a pressure sensor is provided on the end face of the splint 103, and the pressure sensor is used to contact the outer wall of the metal tube body 102, and is connected to the second cylinder 107 through the controller.

[0076] During actual use, there are several guide rods 108, and a limit plate is set at the end of the guide rod 108. The limit plate is used to contact the outer wall of the support frame 105. One end of the several guide rods 108 is slidably connected to the support frame 105, and the other end is fixedly connected to the splint 103. In this way, when the first cylinder 104 is extended or shortened, the guide rod 108 can effectively guide the sliding of the splint 103, so that the splint 103 can be more stable when sliding.

[0077] At the same time, when the pressure sensor on the splint 103 contacts the outer wall of the metal tube body 102, the second cylinder 107 is controlled to contract. After the second cylinder 107 contracts, the support plate 106 is controlled to rotate, and then the support plate 106 is rotated to the bottom of the support frame 105. When the metal tube body 102 falls into the storage box 101, the pressure sensor no longer senses the pressure signal, and then controls the second cylinder 107 to extend after a delay of 2s-3s, so that the support plate 106 forms a groove structure with the support frame 105 again, and then supports the next metal tube body 102. After repeated cycles, the detection of several metal tube bodies 102 is completed.

[0078] See also Figures 1-8As shown, in some embodiments, a transport channel 109 is provided above the support frame 105, and a metal tube flaring structure is connected to one end of the transport channel 109 away from the support frame 105. The metal tube flaring structure is used to flare the port of the metal tube body 102 and then transport it to the two closed support plates 106 on the support frame 105 through the transport channel 109.

[0079] See also Figures 1-8 As shown, as an optional embodiment, in this embodiment, the metal tube expansion structure includes a workbench 121, an expansion assembly and a feeding assembly, the expansion assembly includes a mounting frame 122, a third cylinder 123, an expansion cone 124 and a support block 125, the mounting frame 122 and the support block 125 are arranged on the workbench 121, the fixed end of the third cylinder 123 is arranged on the mounting frame 122, the movable end passes through the mounting frame 122 and is slidably connected to the mounting frame 122, the expansion cone 124 is arranged at the movable end of the third cylinder 123, and a placement groove 126 is provided on the support block 125, the position of the mounting groove corresponds to the position of the expansion cone 124, the interior of the placement groove 126 is used to place the metal tube body 102, and a limiting plug 127 is further provided on the mounting frame 122, the axis of the limiting plug 127 is collinear with the axis of the metal tube body 102;

[0080] The loading assembly includes a loading rack 128, a fourth cylinder 129 and a loading insert 130. The fourth cylinder 129 is arranged on the support block 125. The fourth cylinder 129 is connected to the pressure sensor through a controller. The loading insert 130 is arranged at the end of the fourth cylinder 129. The support block 125 is provided with a socket, which is used to pass through the placement groove 126 and communicate with the outside. The loading insert 130 is slidably installed inside the socket. The loading insert 130 is also slidably connected to the end surface of the loading rack 128.

[0081] The mounting frame 122 is provided with a fixed plate 131, and a fifth cylinder 132 is provided on the fixed plate 131. The fixed end of the fifth cylinder 132 is connected to the fixed plate 131, and the movable end passes through the fixed plate 131 and is slidably connected to the fixed plate 131. The movable end of the fifth cylinder 132 is provided with a pressing block 133, and the pressing block 133 is provided with a clearance groove 134. The inner surface of the clearance groove 134 is used to contact the outer wall of the metal tube body 102.

[0082] A guide slope 135 is provided on the end surface of the placement groove 126, and the inclined direction of the guide slope 135 is aligned with the bottom of the placement groove 126;

[0083] A blanking rack 136 is further provided on the workbench 121 , and a blanking plate 137 is obliquely provided on the blanking rack 136 , and the oblique direction of the blanking plate 137 is aligned with the transport channel 109 .

[0084] In actual use, the staff places several metal tube bodies 102 that have not yet been expanded on the loading rack 128. The several metal tube bodies 102 on the loading rack 128 are continuously rolled until the outer wall of the first metal tube body 102 contacts the support block 125. The loading of the several metal tube bodies 102 is completed. Then the staff controls the fourth cylinder 129 to extend. After the fourth cylinder 129 extends, it drives the loading insert 130 to move. The loading insert 130 slides inside the socket and the loading insert 130 is attached to the side end of the loading rack 128. After the surface slides, the metal tube body 102 at the front of the loading rack 128 is lifted, and then the fourth cylinder 129 is controlled to reset. The metal tube body 102 enters the placement groove 126 on the guide slope 135. The fifth cylinder 132 is extended and drives the pressing block 133 to fix the metal tube body 102. Then the third cylinder 123 is started to extend. After the third cylinder 123 is extended, it drives the expanding cone 124 to move toward the direction of the metal tube body 102, thereby expanding the port position of the metal tube body 102. The limit plug 127 is pressed against the metal tube body 102. The lateral position of the metal tube body 102 is limited, and finally the expansion of the metal tube body 102 is completed. After the expansion is completed, the third cylinder 123 and the fifth cylinder 132 drive the contraction and reset. When the pressure sensor on the clamping plate 103 no longer senses the pressure signal of the metal tube body 102, the fourth cylinder 129 is started to extend (only after the pressure sensor receives the pressure signal, it will control the fourth cylinder 129 to extend when it loses the pressure signal again). The first metal tube body 102 is manually operated. The staff presses on the pressure sensor and then releases it to simulate The action of releasing the metal tube body 102 after being clamped controls the first loading of the fourth cylinder 129). After the fourth cylinder 129 is extended, the loading plug plate 130 located in the socket synchronously lifts the metal tube body 102 at the front of the placement groove 126 and the loading rack 128. The metal tube body 102 in the placement groove 126 rolls onto the transport channel 109 through the unloading plate 137. The metal tube body 102 on the loading rack 128 rolls into the placement groove 126 to wait for expansion, thereby completing the expansion and unloading of several metal tube bodies 102.

[0085] See also Figures 1-9 As shown, in some embodiments, a baffle 110 is provided inside the storage box 101 , and the baffle 110 divides the storage box 101 into the qualified area and the unqualified area. The baffle 110 is located in the middle of the support frame 105 .

[0086] During actual use, the baffle 110 passes through the storage box 101 and reaches the bottom of the support plate 106 (the height of the baffle 110 will not affect the opening and closing of the support plate 106). The qualified area is used to store the metal tube bodies 102 that have passed the preliminary inspection, and the unqualified area is used to store the metal tube bodies 102 that have failed the preliminary inspection. This arrangement facilitates the sorting of the metal tube bodies 102, and the obviously unqualified metal tube bodies 102 are scrapped, and the performance of the qualified metal tube bodies 102 is further in-depth tested.

[0087] See also Figures 1-8 As shown, in some embodiments, the detection component includes a mounting cylinder 111, a slip ring structure, a distance sensor 112, a motor 113 and an adjustment mechanism. The mounting cylinder 111 is slidably mounted on the storage box 101 through a sliding mechanism, the slip ring structure is rotatably mounted inside the storage box 101, and a limiting mechanism is used to prevent the slip ring from moving back and forth. There are several distance sensors 112, and several distance sensors 112 are slidably mounted on the slip ring structure through the adjustment mechanism. The sliding stroke of the distance sensor 112 coincides with a line connecting the edge of the cross section of the mounting cylinder 111 to the center of the cross section of the mounting cylinder 111. The fixed end of the motor 113 is set on the mounting cylinder 111, and the movable end is used to drive the slip ring structure to rotate on the inner wall of the mounting cylinder 111.

[0088] See also Figure 9 As shown, as an optional embodiment, in this embodiment, the sliding mechanism includes a base 138, a sliding rod 139 and a positioning bolt 140. The base 138 is provided with a sliding hole 141, and the side wall of the base 138 is provided with a threaded hole. The positioning bolt 140 is used to be threadedly connected to the threaded hole. One end of the sliding rod 139 is slidably installed in the sliding hole 141, and the other end is fixedly connected to the mounting cylinder 111.

[0089] In this embodiment, the distance sensor 112 is connected to a laser amplifier, which can display the reading of the distance sensor 112 .

[0090] In actual use, when inspecting the flared portion of the fixed metal tube body 102, it is first necessary to slide the slide rod 139 in the slide hole 141 to adjust the position of the mounting cylinder 111 until the axis of the mounting cylinder 111 is in line with the axis of the metal tube body 102. Then, the positioning bolt 140 is screwed into the threaded hole on the side wall of the base 138. The positioning bolt 140 is tightly pressed against the outer surface of the slide rod 139. The position of the slide rod 139 is fixed by squeezing. Then, the adjustment mechanism is used to synchronously adjust the positions of the multiple distance sensors 112. Then, the distance sensors 112 are started. A laser is emitted to illuminate the end face of the expanded portion of the metal tube body 102, and then the motor 113 is driven to rotate. After the motor 113 rotates, the slip ring structure is driven to rotate, and then the distance sensor 112 is driven to rotate. The laser emitted by the distance sensor 112 continuously rotates and scans the end face of the expanded portion of the metal tube body 102. If the reading on each laser amplifier fluctuates slightly, it indicates that the metal tube body 102 is in a qualified state in the preliminary inspection; if the reading on each laser amplifier fluctuates greatly, it indicates that there is a crack on the metal tube body 102, thereby achieving the purpose of preliminary inspection of the expanded performance of the metal tube body 102.

[0091] In some embodiments, the slip ring structure includes a slip ring 114 and a mounting bucket 115. The slip ring 114 and the mounting bucket 115 are connected by a number of connecting rods to form an integrated structure. The slip ring 114 is slidably installed on the inner wall of the mounting cylinder 111 through the limiting mechanism. The adjustment mechanism is arranged on the mounting bucket 115, and the output shaft of the motor 113 is fixedly connected to the mounting bucket 115.

[0092] See also Figure 9 As shown, as an optional embodiment, in this embodiment, the limiting mechanism includes a limiting groove 142 and a limiting protrusion 117. The limiting protrusion 117 is an annular structure. The limiting protrusion 117 is arranged on the inner surface of the mounting tube 111, and the limiting groove 142 is arranged on the outer surface of the sliding ring 114. The limiting protrusion 117 and the limiting groove 142 are slidably matched.

[0093] During actual use, the motor 113 rotates and drives the installation bucket 115 to rotate. After the installation bucket 115 rotates, it drives the sliding ring 114 to rotate on the inner wall of the installation cylinder 111 through the connecting rod. At this time, relative rotation occurs between the limiting protrusion 117 and the limiting groove 142, thereby achieving the purpose of limiting the sliding ring 114 during rotation.

[0094] See also Figures 1-8As shown, in some embodiments, the adjustment mechanism includes a screw 116, a threaded hole is provided on the mounting bucket 115, the screw 116 is threadedly installed on the threaded hole, and a rotating protrusion 118 is provided on the outer surface of the distance sensor 112, and the rotating protrusion 118 is connected to the screw 116 for damping rotation.

[0095] In actual use, when adjusting the position of the distance sensor 112, the screw 116 is first rotated. When rotating the screw 116, the staff holds the distance sensor 112, causing the rotating protrusion 118 and the screw 116 to rotate relative to each other. Since the rotating protrusion 118 and the screw 116 are connected by a damping sliding connection, when the motor 113 rotates, the rotating protrusion 118 will not cause the distance sensor 112 to rotate relative to each other. The advantage of this arrangement is that it can adapt to different batch sizes of metal pipe bodies 102, thereby making the detection component more applicable.

[0096] In some embodiments, the end of the mounting bucket 115 has a cylinder 119, which is connected to the inner wall of the mounting bucket 115. The output shaft of the motor 113 is fixedly connected to the cylinder 119. The cylinder 119 is provided with a wiring hole 120, which is used to make way for the cable on the distance sensor 112.

[0097] In actual use, the purpose of providing the cylinder 119 and the wiring hole 120 is to facilitate the wiring of the distance sensor 112.

[0098] See also Figures 1-10 As shown, in some embodiments, the present invention further includes a method for detecting the performance of metal tube expansion, the performance detection method comprising the following steps:

[0099] S1: Perform a preliminary inspection on the flaring position of the metal tube body 102:

[0100] S101: When the metal tube body 102 reaches the support plate 106 and the outer wall of the metal tube body 102 contacts the support plate 106, the first cylinder 104 is driven to extend and the position of the metal tube body 102 is fixed by the clamping plate 103;

[0101] S102: Adjust the position of the installation cylinder 111 so that the center of the installation cylinder 111 corresponds to the center of the metal tube body 102;

[0102] S103: The position of the distance sensor 112 is adjusted by the screw 116, so that the distance sensors 112 are synchronously moved toward or away from the center of the cross section of the mounting tube 111, until the lasers emitted by the distance sensors 112 are all able to illuminate the end face of the metal tube body 102 with the largest inner diameter after expansion, which is a qualified product. The screw 116 is then stopped.

[0103] S104: After turning on the distance sensors 112, the motor 113 is used to start the control slip ring structure to drive the distance sensors 112 to rotate. The reading on the laser amplifier is used to observe the change in the value of the distance sensor 112 irradiated on the end surface of the metal tube body 102;

[0104] S1041: After the motor 113 rotates, if the readings on each laser amplifier fluctuate significantly, it indicates that there is a crack on the metal tube body 102;

[0105] S1042: At this time, the distance sensor 112 controls the first cylinder 104 above the qualified area to extend through the controller, and controls the first cylinder 104 above the unqualified area to contract. At this time, the metal tube body 102 is located above the unqualified area.

[0106] S1043: Then, the second cylinder 107 below the support plate 106 is controlled to retract. At this time, the two support plates 106 are opened, and the support frame 105 is hollow. At the same time, the first cylinders 104 on both sides are controlled to retract. At this time, the metal tube body 102 is no longer clamped by the clamping plates 103 and falls into the unqualified area.

[0107] S1044: If the readings on each laser amplifier fluctuate slightly, it indicates that the metal tube body 102 has passed the preliminary inspection. S1045: At this time, the distance sensor 112 controls the first cylinder 104 above the unqualified area to extend through the controller, and controls the first cylinder 104 above the qualified area to retract. At this time, the metal tube body 102 is located above the qualified area.

[0108] S1046: Then, the second cylinder 107 below the support plate 106 is controlled to retract. At this time, the two support plates 106 are opened, and the support frame 105 is hollow. At the same time, the first cylinders 104 on both sides are controlled to retract. At this time, the metal tube body 102 is no longer clamped by the clamping plates 103 and falls into the qualified area.

[0109] S105: Repeat the above steps S101-S1046, and finally process the unqualified metal tube bodies 102, and collect the preliminarily qualified metal tube bodies 102;

[0110] S2: Depth detection of the flaring position of the metal tube body 102 is performed using the following formula:

[0111]

[0112] in,

[0113] represents the intensity factor;

[0114] It is expressed as the measured burst pressure after the metal tube is expanded;

[0115] Expressed as the rated working pressure required by design;

[0116] represents the deformation attenuation term;

[0117] It is the abbreviation of Exponential Function, which means the natural constant.

[0118] Expressed as the maximum diameter deviation of the flared section;

[0119] Expressed as the original diameter of the metal tube;

[0120] Expressed as the dimensionless coefficient of material plasticity;

[0121] represents the sealing effectiveness term;

[0122] Expressed as the leak rate measured by helium mass spectrometer leak detection;

[0123] Expressed as the maximum leakage allowed by the standard;

[0124] Expressed as a dimensionless temperature correction coefficient, ,in is the operating temperature change;

[0125] In this embodiment, the above formula includes the mechanical strength ( )、Geometric accuracy( ) and sealing effectiveness ( ), these three aspects are the core evaluation dimensions of expansion performance and meet the actual needs of the project;

[0126] The product form (rather than weighted summation) is used because the influence of various factors on performance is coupled and nonlinear. For example, even if the strength meets the standard =1.5, if the deformation is too large ( term approaches 0), the overall performance will still degrade significantly.

[0127] Secondly, the sealing effectiveness term introduces the temperature influence through power operation, which is more consistent with the nonlinear effect of temperature fluctuation on leakage rate in actual working conditions.

[0128] The multiplication of the symbols reflects the synergistic effect of different performance factors, which are explained as follows:

[0129] Indicates the strength factor, which is used to quantify the bearing capacity of the expanded structure. The higher the ratio, the greater the compressive safety margin. If the strength after expansion is insufficient, <1.5, even if the sealing is good, the pipeline may rupture and fail under high pressure.

[0130] Represents the deformation attenuation term, which is used to characterize the attenuation effect of geometric deformation on performance. The larger the deformation, the more significant the attenuation, and

[0131] The steps for collecting the above data are as follows: the deformation tolerance of different materials is distinguished by the plasticity coefficient λ.

[0132] at last, It represents the sealing effectiveness item, which is used to dynamically evaluate the temperature adaptability of the sealing performance. Exceeding the leakage rate or excessive temperature difference will significantly reduce the value of this item.

[0133] Therefore, the essence of multiplying these three factors is a chain reaction of performance degradation, for example:

[0134] Expansion deformation (ΔD is too large) may cause uneven sealing surface ( Increase), while local stress concentration reduces the blasting strength ( decline);

[0135] As the temperature rises ( Increased pressure increases the risk of leakage and may reduce the strength of the material.

[0136] S201: According to ISO 1179 standard, the metal pipe body 102 is pressurized by a pneumatic burst tester until the pipe ruptures, and the peak pressure is measured by a sensor. Recorded and rated Calculate the intensity factor term;

[0137] S202: Scan the expanded end of the metal tube body 102 with a three-dimensional laser scanner, obtain the expanded data of the metal tube body 102 and record it, and calculate the maximum diameter deviation of the expanded end of the metal tube body 102, ΔD=|D max -D design ∣;

[0138] Among them, D max represents the maximum diameter of the metal tube body 102 at the end thereof; D design Represents the actual diameter size at the end of the metal tube body 102;

[0139] S203: Use digital calipers to measure the original diameter Take measurements and record them;

[0140] S204: Through specific materials Value, calculate the deformation attenuation term;

[0141] S205: After sealing both ends of the metal tube body 102, perform vacuum treatment, then inject helium into the vacuum cavity formed by the metal tube body 102, and detect the helium leakage rate , and record it, where Determined according to specific industry standards, is a fixed value;

[0142] S206: Use a temperature cycle box to simulate the working temperature, and calculate the temperature change through the maximum and minimum temperatures inside the temperature cycle box. The formula is: , calculate , and substitute into the formula: In, calculate ;

[0143] in, Indicates the maximum temperature inside the temperature cycle box. Indicates the lowest temperature inside the temperature cycle box;

[0144] S207: Substitute the above recorded values ​​and fixed values ​​into After calculating the formula, we get value.

[0145] S208: Repeat the steps S201-S207 above to test different metal tube bodies 102, record the data, and evaluate the performance of the metal tube body 102 according to the evaluation criteria. The metal tube bodies 102 of different values ​​are classified and The metal pipe body 102 of high value is distributed to different fields for application.

[0146] As an optional embodiment, in this embodiment, the performance of the aluminum tube and the alloy tube (stainless steel tube) in the metal tube body 102 is tested; the experimental data is referred to in the attached Figure 10 As shown;

[0147] As an optional implementation, in this embodiment, in the experiment number 3, the distance is measured, and the specific experimental steps are as follows:

[0148] Use a hydraulic blasting machine of model MTS 810 to pressurize the metal pipe body 102 until the pipe ruptures, and then measure the peak pressure through the sensor. =35MPa for recording;

[0149] Laser scanning using the GOM ATOS model showed that the maximum diameter deviation of the flared section was ΔD = 0.12 mm;

[0150] The helium mass spectrometer measured δ at ΔT = 20°C. leak =9×10 -6 mbar·L / s.

[0151] Material parameters, alloy (stainless steel) corresponding =1.2.

[0152] Substitute into the formula for FCPI to calculate;

[0153] First, calculate the degree factor:

[0154]

[0155] Then calculate the deformation attenuation term:

[0156] = ≈0.9857

[0157] Then calculate the sealing effectiveness term:

[0158] =1+0.02×20=1.4

[0159]

[0160] Finally, substitute into the FCPI formula:

[0161] FCPI=1.75×0.9857×0.063≈0.671

[0162] Finally, the results were analyzed. Since FCPI = 0.671 < 0.8, it was determined to be in need of optimization.

[0163] In this embodiment, the experimental analysis is as follows:

[0164] First, compare Experiment 1 and Experiment 3.

[0165] The aluminum tube (Experiment 1) can still maintain high performance (FCPI = 0.947) even when ΔD = 0.08 mm.

[0166] For stainless steel (Experiment 3), the FCPI is significantly reduced due to λ = 1.2 and critical leakage rate under similar deformation.

[0167] Secondly, comparing Experiment 2 and Experiment 5,

[0168] In Experiment 2 (ΔT=50°C) =2.0, but due to the low leakage rate (8×10-6 ) are still eligible.

[0169] In Experiment 5 (ΔT=80°C) =2.6, amplifying the leakage effect, resulting in FCPI=0.452.

[0170] Finally, in Experiment 4, ΔD = 0.25 mm causes the deformation attenuation term to drop sharply to (-1.2×0.025)≈0.740, and the leakage rate exceeds the standard, resulting in FCPI=0.312.

[0171] Experimental conclusion:

[0172] FCPI can sensitively reflect the coupling effects of strength, deformation, and leakage, which is consistent with the experimental results. After testing several metal tube bodies 102, the more specific performance of the metal tube bodies 102 can be clearly known, and qualified metal tube bodies 102 with different performance can be allocated to various fields for application. Metal tube bodies 102 that appear qualified to the naked eye but actually have unqualified performance can also be sorted in a timely manner to prevent problems caused by poor performance of the metal tube bodies 102 in subsequent use.

[0173] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0174] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0175] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" 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, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0176] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting the expansion performance of a metal tube, comprising using a metal tube expansion performance detection device, characterized in that: The metal tube expansion performance testing device includes: The performance detection structure includes a fixed sorting component, a detection component, and a storage box with qualified and unqualified areas. The fixed sorting component is used to fix the metal tube body and sort the metal tube body into the storage box. The detection component is installed on the storage box and is used to detect the end of the metal tube body. The fixed sorting assembly includes a blanking mechanism and a clamping plate. The blanking mechanism is arranged above the opening of the storage box and is used to support and blank the metal tube body. A first cylinder is provided on both sides of the blanking mechanism. The clamping plate is provided at the movable end of the first cylinder and is used to fix the metal tube body to the blanking mechanism. The performance testing method comprises the following steps: S1: Preliminary inspection of the flaring position of the metal tube body: S101: When the metal tube body reaches the support plate and the outer wall of the metal tube body contacts the support plate, the first cylinder is driven to extend and the position of the metal tube body is fixed by the clamping plate; S102: Adjusting the position of the installation cylinder so that the center of the installation cylinder corresponds to the center of the metal tube body; S103: Adjust the position of the distance sensors by means of a screw, so that the distance sensors are synchronously moved toward or away from the center of the cross section of the mounting tube, until the lasers emitted by the distance sensors are all able to illuminate the end face with the largest inner diameter after the expansion of the qualified metal tube body, and then stop rotating the screw; S104: After turning on a plurality of distance sensors, the motor starts to control the slip ring structure to drive the plurality of distance sensors to rotate, and the reading on the laser amplifier is used to observe the change in the value of the distance sensor irradiated on the end surface of the metal tube body; S1041: After the motor rotates, if the readings on each laser amplifier fluctuate significantly, it indicates that there is a crack on the metal tube body; S1042: At this time, the distance sensor controls the first cylinder above the qualified area to extend through the controller, and controls the first cylinder above the unqualified area to retract. At this time, the metal tube body is located above the unqualified area. S1043: Then, the second cylinder below the support plate is controlled to retract. At this time, the two support plates are opened, and the support frame is hollow. At the same time, the first cylinders on both sides are controlled to retract. At this time, the metal tube body is no longer clamped by the clamping plates and falls into the unqualified area. S1044: If the readings on each laser amplifier fluctuate slightly, it indicates that the metal tube body has passed the preliminary inspection. S1045: At this time, the distance sensor controls the first cylinder above the unqualified area to extend through the controller, and controls the first cylinder above the qualified area to retract. At this time, the metal tube body is located above the qualified area. S1046: Then, the second cylinder below the support plate is controlled to retract. At this time, the two support plates are opened, and the support frame is hollow. At the same time, the first cylinders on both sides are controlled to retract. At this time, the metal tube body is no longer clamped by the clamping plates and falls into the qualified area. S105: Repeat the above steps S101-S1046, and finally process the unqualified metal tube bodies and collect the preliminarily qualified metal tube bodies; S2: Depth detection of the flaring position of the metal tube body is performed using the following formula: in, represents the intensity factor; It is expressed as the measured burst pressure after the metal tube is expanded; Expressed as the rated working pressure required by design; represents the deformation attenuation term; It is the abbreviation of Exponential Function, which means the natural constant. Expressed as the maximum diameter deviation of the flared section; Expressed as the original diameter of the metal tube; Expressed as the dimensionless coefficient of material plasticity; represents the sealing effectiveness term; Expressed as the leak rate measured by helium mass spectrometer leak detection; Expressed as the maximum leakage allowed by the standard; Expressed as a dimensionless temperature correction coefficient, ,in is the operating temperature change; The steps for collecting the above data are as follows: S201: According to ISO 1179 standard, the metal pipe body is pressurized by the air pressure burst tester until the pipe breaks, and the peak pressure is measured by the sensor. Recorded and rated Calculate the intensity factor term; S202: Scan the expanded end of the metal tube body with a three-dimensional laser scanner, obtain the expanded data of the metal tube body and record it, and calculate the maximum diameter deviation of the expanded end of the metal tube body, ΔD=|D max -D design ∣; Among them, D max Represents the maximum diameter of the metal tube body at the end; D design Represents the actual diameter size of the metal tube body at the end; S203: Use digital calipers to measure the original diameter Take measurements and record them; S204: Through specific materials Value, calculate the deformation attenuation term; S205: After sealing both ends of the metal tube body, perform vacuum treatment, then inject helium into the vacuum cavity formed by the metal tube body and detect the helium leakage rate , and record it, where Determined according to specific industry standards, is a fixed value; S206: Use a temperature cycle box to simulate the working temperature, and calculate the temperature change through the maximum and minimum temperatures inside the temperature cycle box. The formula is: , calculate , and substitute into the formula: In, calculate ; in, Indicates the maximum temperature inside the temperature cycle box. Indicates the lowest temperature inside the temperature cycle box; S207: Substitute the above recorded values ​​and fixed values ​​into After calculating the formula, we get The value of S208: Repeat the above steps S201-S207 to test different metal pipe bodies and record the data. And according to the evaluation criteria, the performance of the metal pipe body is evaluated. The metal pipe bodies of different values ​​are classified and The metal pipe bodies of different values ​​are distributed to different fields for application.

2. The method for detecting the expansion performance of a metal tube according to claim 1, wherein: The blanking mechanism includes a support frame and a support plate. The support frame is installed above the opening of the storage box. There are two support plates, which are hinged to the support frame. The two support plates rotate in opposite directions. A second cylinder is hinged to the bottom of each support plate. The movable end of the second cylinder is hinged to the support plate, and the fixed end of the second cylinder is hinged to the support frame.

3. The method for detecting the expansion performance of a metal tube according to claim 2, wherein: A guide rod is slidingly provided on the support frame, one end of the guide rod is connected to the splint, and the other end is slidingly connected to the support frame. A pressure sensor is provided on the end face of the splint. The pressure sensor is used to contact the outer wall of the metal tube body and is connected to the second cylinder through the controller.

4. The method for detecting the expansion performance of a metal tube according to claim 2, wherein: A transport channel is provided above the support frame, and a metal tube expansion structure is connected to the end of the transport channel away from the support frame. The metal tube expansion structure is used to expand the port of the metal tube body and then transport it to the two closed support plates on the support frame through the transport channel.

5. The method for detecting the expansion performance of a metal tube according to claim 1, wherein: A baffle is provided inside the storage box, which divides the storage box into the qualified area and the unqualified area. The baffle is located in the middle of the support frame.

6. The method for detecting the expansion performance of a metal tube according to claim 1, wherein: The detection assembly includes a mounting tube, a slip ring structure, a distance sensor, a motor and an adjustment mechanism. The mounting tube is slidably mounted on the storage box through the sliding mechanism. The slip ring structure is rotatably mounted inside the storage box, and a limiting mechanism is used to prevent the slip ring from moving back and forth. There are several distance sensors, and the several distance sensors are slidably mounted on the slip ring structure through the adjustment mechanism. The sliding stroke of the distance sensor coincides with the line connecting the edge line of the mounting tube cross section to the center point of the mounting tube cross section. The fixed end of the motor is set on the mounting tube, and the movable end is used to drive the slip ring structure to rotate on the inner wall of the mounting tube.

7. The method for detecting the expansion performance of a metal tube according to claim 6, wherein: The slip ring structure includes a sliding ring and a mounting bucket. The sliding ring and the mounting bucket are connected by several connecting rods to form an integrated structure. The sliding ring is slidably mounted on the inner wall of the mounting cylinder through the limiting mechanism. The adjusting mechanism is arranged on the mounting bucket, and the output shaft of the motor is fixedly connected to the mounting bucket.

8. The method for detecting the expansion performance of a metal tube according to claim 7, wherein: The adjusting mechanism includes a screw rod, a threaded hole is provided on the installation bucket, the screw rod is threadedly installed on the threaded hole, and a rotating protrusion is provided on the outer surface of the distance sensor, and the rotating protrusion is connected to the screw rod for damping rotation.

9. The method for detecting the expansion performance of a metal tube according to claim 7, wherein: The end of the installation bucket is provided with a cylinder, which is communicated with the inner wall of the installation bucket. The output shaft of the motor is fixedly connected to the cylinder. A wiring hole is provided on the cylinder, which is used to make way for the cable on the distance sensor.

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