Metal pipe axial pressure fatigue test and online flaw detection equipment

Abstract

The invention belongs to the technical field of metal pipe fatigue testing and metal flaw detection, and particularly relates to metal pipe axial pressure fatigue testing and online flaw detection equipment which comprises a support, a driving motor, a rotating shaft, a pressing plate and a flaw detector. The bracket comprises a base, a bracket and a frame; the tail end of the driving motor is installed on the support through a first knuckle bearing, one end of the rotating shaft is fixed to the power output end of the driving motor, and an eccentric balancing weight is installed on the rotating shaft. The frame is of a frame structure, a pressing plate is arranged in the frame, and a second knuckle bearing is arranged in the middle of the pressing plate. The other end of the rotating shaft is connected to the second knuckle bearing. A to-be-tested metal tube is positioned between the pressing plate and the inner bottom of the frame; and a flaw detector for detecting the metal tube is arranged on the frame. Axial pressure testing can be conducted on metal pipes of different specifications, metal fatigue is likely to be formed, defective metal pipes can be conveniently exposed, the defective metal pipes can be found in time in the subsequent metal pipe flaw detection process, and the device can be applied to metal pipe sampling and quality inspection work.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pipe fatigue testing and metal flaw detection, in particular to a metal pipe axial pressure fatigue testing and online flaw detection device. Background Art

[0002] Metal pipes are mainly used in the construction field for electrical pipes, water supply and drainage pipes, HVAC pipes, etc., and there is an increasing demand for the quality and service life of metal pipes. Metal pipes are subjected to constant loads and live loads in buildings for a long time. Among them, the constant load is the load that continuously acts on the pipe, such as the pipe's own weight, thermal expansion, and self-stress. The live load is the load that temporarily acts on the pipe, mainly including wind loads and earthquake loads.

[0003] In the past, the factory quality inspection of metal pipes was mostly conducted with tensile and radial force tests. For pipes in the walls of buildings, in addition to horizontal arrangements, there are also oblique and vertical arrangements. The oblique and vertical arrangements will bear greater pressure in the axial direction of the pipe, and the axial pressure test of the pipe is often easily overlooked. When metal pipes are arranged obliquely and vertically in a building, and both ends are fixed in the wall with no space for expansion, in long-term use, the pipes are frequently compressed in the axial direction, which is prone to metal fatigue. For example, the pipes mentioned above expand and elongate due to heat, or the building shakes under the action of wind, or the building vibrates under micro-earthquakes. The oblique or vertical pipes in the wall will be constantly compressed in the axial direction, causing metal fatigue. Metal pipes with poor quality are more likely to crack and deform under long-term metal fatigue, which brings great hidden dangers to subsequent maintenance.

[0004] Therefore, during the quality inspection of metal pipes before leaving the factory, it is also necessary to carry out pressure fatigue testing and flaw detection in the axial direction of the pipes, so as to improve the factory quality of metal pipes and ensure the user experience. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that metal pipes are not subjected to axial pressure fatigue testing and flaw detection during factory sampling, which leads to quality problems during use, and to propose an axial pressure fatigue testing and online flaw detection equipment for metal pipes.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A metal pipe axial pressure fatigue test and online flaw detection equipment, including a bracket, a drive motor, a rotating shaft, a pressure plate, and a flaw detector; The bracket comprises a base and a bracket and a frame perpendicular to the base; The tail end of the driving motor is mounted on the bracket through a joint bearing, one end of the rotating shaft is fixed to the power output end of the driving motor, and an eccentric counterweight is installed on the rotating shaft; The frame is a frame structure facing the rotating shaft, and a pressing plate is arranged horizontally and perpendicular to the rotating shaft. The pressing plate is limited to the top position in the frame and moves up and down slightly, and two joint bearings are arranged in the middle of the pressing plate; The other end of the rotating shaft is connected to the second joint bearing, and the first joint bearing and the second joint bearing are arranged at the same height; A plurality of metal pipes to be tested are located between the pressing plate and the bottom of the frame; A flaw detector for detecting metal pipes is provided on the frame.

[0007] As a further preferred solution, there are slide rails on both sides of the frame, and a base is provided at the bottom of the frame, and the base moves up and down along the slide rails on the corresponding side through the longitudinal grooves on both sides; A spiral lifting mechanism is arranged between the base and the inner bottom of the frame.

[0008] As a further preferred solution, the spiral lifting mechanism includes a screw rod at the bottom of the frame, a slide seat on the screw rod and a connecting rod arm 1; The screw rod horizontally penetrates the frame and is limited in rotation, and the end of the screw rod is a turning handle; The screw rod is provided with a forward thread and a reverse thread, and a slide seat is respectively provided on the forward thread area and the reverse thread area; The upper part of the slide seat and the lower part of the base are provided with a hinged part, and a connecting rod arm 1 is provided between the hinged part of the slide seat and the hinged part of the base.

[0009] As a further preferred solution, a plurality of positioning grooves are arranged along the length direction at the lower part of the pressing plate and the upper part of the base, the positioning grooves are hinged to the pressing plate or the base, the direction of the hinged movement is perpendicular to the rotating shaft, and the positioning grooves are used to fix the ends of the metal pipes; The positioning grooves on the pressure plate and the base correspond one to one.

[0010] As a further preferred solution, a plurality of length balancing mechanisms are provided at the lower part of the pressing plate along the length direction, and the length balancing mechanisms include a slide slot, two balancing seats, and a plurality of connecting rod arms; The groove in the slide is parallel to the pressure plate, and a slider is provided in the groove, and the slider is limited to move in the groove; Two balancing seats are arranged on both sides of the slide slot and connected to the slide block through a second connecting rod arm; The balance seat is hinged to the slider in the slide slot through a connecting rod arm 2, and is hinged to the lower part of the pressure plate through another connecting rod arm 2; The positioning groove is arranged at the bottom of the balancing seat.

[0011] As a further preferred solution, inner sleeves with various inner diameter specifications are provided in the positioning groove, and the inner diameter specifications of the inner sleeves are suitable for metal pipes with various specifications.

[0012] As a further preferred solution, the pressure plate passes through the top of the frame through two guide rods, a retaining ring is provided on the guide rod outside the top of the frame, a spring is provided between the retaining ring and the top of the frame, and the pressure plate is tightly attached to the top of the frame through the spring; As a further preferred solution, pulley rows are provided at the frames at both ends of the pressing plate, and the pulley rows are in contact with the ends of the pressing plate.

[0013] As a further preferred solution, a sensor is provided on the base for detecting the pressure jointly applied by the multiple positioning grooves. Beneficial Effects

[0014] The present invention can perform axial pressure tests on metal pipes of different specifications, so as to cause metal fatigue in the metal pipes, aggravate cracking inside the metal, and facilitate exposing defective metal pipes. Defective metal pipes can be discovered in time in subsequent metal pipe flaw detection.

[0015] The present invention can be applied to the sampling quality inspection of metal pipes to improve the quality of metal pipes before leaving the factory, and avoid the metal pipes being easily damaged during use, thereby increasing the cost of repair and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a side view of the present invention; Figure 2 It is a front view of the frame of the present invention; Figure 3 It is a schematic diagram of the interior of the chute of the present invention; In the figure: 1. driving motor, 2. rotating shaft, 3. pressing plate, 4. flaw detector, 51. base, 52. bracket, 53. frame, 54. joint bearing 1, 55. joint bearing 2, 56. slide rail, 57. pulley row, 6. metal pipe, 7. base, 8. spiral lifting mechanism, 81. screw, 82. slide seat, 83. connecting rod arm 1, 9. positioning groove, 10. length balancing mechanism, 101. slide groove, 102. balancing seat, 103. connecting rod arm 2, 104. slider, 11. guide rod. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] like Figure 1As shown, a metal pipe axial pressure fatigue test and online flaw detection equipment of the present invention includes a bracket, a driving motor 1, a rotating shaft 2, a pressing plate 3, and a flaw detector 4. The metal pipe 6 is vertically installed in the bracket and is pressed down and fixed by the pressing plate 3. The rotating shaft 2 with an eccentric counterweight block 5 is connected between the driving motor 1 and the pressing plate 3. The inertia brought by the rotation of the rotating shaft 2 continuously presses down the metal pipe 6 to achieve metal fatigue of the metal pipe 6 and aggravate cracking inside the metal. It is convenient for the flaw detector 4 to perform real-time detection to complete the axial pressure test of the metal pipe to reflect whether the quality of the batch of metal pipes meets the standards.

[0019] The bracket includes a horizontally arranged base 51 , and a bracket 52 and a frame 53 vertically arranged on the base 51 . The bracket 52 is used to install the drive motor 1 , and the metal pipe 6 and related fixing mechanisms are located in the frame 53 .

[0020] Specifically, the tail end of the driving motor 1 is mounted on the bracket 52 through a joint bearing 54, so that the driving motor 1 and the rotating shaft 2 can move micro-flexibly together; The bracket 52 has a support plate for supporting the driving motor 1, and a bracket is provided on the support plate. The driving motor 1 is fixed in the bracket. A spring is provided between the support plate and the bracket to provide a supporting force in a static state. In a working state, the driving motor 1 can slightly move along with the rotating shaft 2 according to the rotation inertia of the rotating shaft 2, and will not hinder the occurrence of downward pressure on the rotating shaft 2. The rotating shaft 2 is a rotating component, and an eccentric counterweight 5 can be installed on the rotating shaft 2. The eccentric counterweight 5 has multiple weight options. The eccentric counterweight 5 of different weights is selected according to the specifications of the metal tube 6. One end of the rotating shaft 2 is fixed to the power output end of the driving motor 1. The frame 53 is a frame structure facing the rotating shaft 2. The frame 53 has a pressing plate 3, which is arranged horizontally and perpendicular to the rotating shaft 2. The pressing plate 3 is limited to move up and down at the top position in the frame 53. A joint bearing 2 55 is arranged in the middle of the pressing plate 3. The pressing plate 3 only provides downward pressure under the inertia of the rotating shaft 2, and is attached to the top of the frame 53 in the frame 53. The other end of the rotating shaft 2 is connected to the second joint bearing 55. In the initial state, the first joint bearing 54 and the second joint bearing 55 are arranged at the same height; The plurality of metal tubes 6 to be tested are located between the pressing plate 3 and the inner bottom of the frame 53; The frames 53 at both ends of the pressing plate 3 are provided with pulley rows 57, and the pulley rows 57 are in contact with the ends of the pressing plate 3, providing an application environment that facilitates the upward and downward movement of the pressing plate 3; A flaw detector 4 for detecting the metal tube 6 is disposed on the frame 53. After the longitudinal extrusion test of the metal tube is completed, the probe of the flaw detector 4 can be removed to directly detect flaws on the metal tube.

[0021] The flaw detector 4 used in the present invention is a portable ultrasonic flaw detector, which detects cracks inside the metal pipe by emitting ultrasonic waves and utilizing their reflection, transmission and other characteristics. Embodiment 1

[0022] There are slide rails 56 on both sides of the frame 53, and a base 7 is provided at the bottom of the frame 53. The base 7 moves up and down along the slide rails 56 on the corresponding side through the longitudinal grooves on both sides. A spiral lifting mechanism 8 is arranged between the base 7 and the bottom of the frame 53. The base 7 can move up and down with the lifting mechanism 8 to change the distance between the base 7 and the pressing plate 3, so that the present invention can be applied to metal pipes 6 of different lengths.

[0023] Specifically, the spiral lifting mechanism 8 includes a screw 81 at the bottom of the frame 53, a slide 82 on the screw 81 and a connecting rod arm 83; the screw 81 horizontally penetrates the frame 53 for limited rotation, and the end of the screw 81 is a handle or electric rotation; the screw 81 has a forward thread and a reverse thread, and a slide 82 is provided on the forward thread and the reverse thread area respectively; the upper part of the slide 82 and the lower part of the base 7 have a hinged part, and the connecting rod arm 83 is between the hinged part of the slide 82 and the hinged part of the base 7.

[0024] When the screw rod 81 rotates, the slide seats 82 on the forward thread and the reverse thread will move toward or away from each other, thereby pulling the two connecting rod arms 83 to achieve the lifting and lowering of the base 7.

[0025] like Figure 2 As shown, a screw rod 81 is provided with two groups of positive threads and reverse threads, that is, there are at least two screw lifting mechanisms 8 , and the multiple screw lifting mechanisms 8 share one screw rod 81 .

[0026] A plurality of positioning grooves 9 are arranged along the length direction at the lower part of the pressing plate 3 and the upper part of the base 7. The positioning grooves 9 are hinged to the pressing plate 3 or the base 7. The direction of the hinged movement is perpendicular to the rotating shaft 2. The positioning grooves 9 are used to fix the ends of the metal tube 6. The positioning grooves 9 on the pressing plate 3 and the base 7 correspond one to one and can fix the metal tube 6. Embodiment 2

[0027] Since there may be slight length differences between the metal tubes 6 produced by different equipment, when a plurality of metal tubes 6 with slight length differences are subjected to pressure test together, the shorter metal tube 6 is not easily subjected to the expected pressure test and cannot correctly reflect whether its quality is qualified. Therefore, a length balancing mechanism 10 is designed that can automatically compensate for a plurality of metal tubes 6 of different lengths. The length balancing mechanism 10 can average the lengths of the plurality of metal tubes 6 of different lengths, so that the force applied to each metal tube 6 tends to be infinitely consistent.

[0028] There are two arrangements of the length balancing mechanism 10. One is an arrangement of multiple length balancing mechanisms 10, that is, each length balancing mechanism 10 balances the lengths of two metal tubes 6, and the lengths of the metal tubes 6 balanced by each length balancing mechanism 10 tend to be consistent with the lengths of the metal tubes 6 balanced by other length balancing mechanisms 10. This is suitable for pressure testing of a large number of metal tubes 6 installed at the same time, and can significantly reduce the length difference; the other is an arrangement of a single length balancing mechanism 10, that is, lengths of a plurality of metal tubes 6 are balanced at one time, so that the lengths of the various metal tubes 6 are highly unified. However, due to the limitation that the design length of the slide 101 is not too long, which affects practicality, this is suitable for pressure testing of a small number of metal tubes 6 installed at the same time, and the lengths of the various metal tubes 6 can be highly unified. Practicality is not considered under this arrangement, and a large number of metal tubes 6 can be installed, which is suitable for more precise test scenarios.

[0029] In the arrangement mode of a single length balancing mechanism 10, a length balancing mechanism 10 is provided at the lower part of the pressing plate 3 along the length direction, and the length balancing mechanism 10 includes a slide 101, two balancing seats 102, and a connecting rod arm 103; a plurality of slides 101 are arranged along the length direction of the pressing plate 3, and the groove in the slide 101 is parallel to the pressing plate 3, and a slider 104 is provided in the groove of each slide 101, and the slider 104 is limited to move in the groove; the number of balancing seats 102 is greater than that of the slides 101 There is one more, and several balancing seats 102 and several sliding grooves 101 are arranged alternately; the balancing seat 102 is hinged to the slider 104 in the sliding groove 101 on one side through a connecting arm 103, and is hinged to the slider 104 in the sliding groove 101 on the other side through another connecting arm 103; the balancing seat 102 at the head and tail position is hinged to the slider 104 in the adjacent sliding groove 101 through a connecting arm 103, and is hinged to the lower part of the pressure plate 3 through another connecting arm 103.

[0030] In the arrangement mode of multiple length balancing mechanisms 10, a plurality of length balancing mechanisms 10 are provided along the length direction at the lower part of the pressure plate 3, and the length balancing mechanism 10 includes a slide groove 101, two balancing seats 102, and a plurality of connecting arm 2s 103; the groove in the slide groove 101 is parallel to the pressure plate 3, and a slider 104 is provided in the groove, and the slider 104 is limited to move in the groove; the two balancing seats 102 are respectively arranged on both sides of the slide groove 101, and are connected to the slider 104 through the connecting arm 2 103; the balancing seat 102 is hinged to the slider 104 in the slide groove 101 through a connecting arm 2 103, and is hinged to the lower part of the pressure plate 3 through another connecting arm 2 103.

[0031] In both arrangements, the positioning groove 9 is arranged at the bottom of the balancing seat 102, and a plurality of positioning grooves 9 are also arranged on the upper part of the base 7 along the length direction. The positioning groove 9 is hinged to the balancing seat 102 and the base 7, and the direction of the hinged activity is perpendicular to the rotating shaft 2. The positioning groove 9 is used to fix the end of the metal tube 6; the positioning grooves 9 on the pressure plate 3 and the base 7 correspond one to one, and the metal tube 6 can be fixed.

[0032] The slider 104 has an oil groove inside, into which lubricating oil can be poured, so as to facilitate movement in the slide groove 101 .

[0033] Furthermore, the positioning groove 9 is provided with inner sleeves with various inner diameter specifications, and the inner diameter specifications of the inner sleeves are suitable for metal pipes 6 with various specifications (diameters).

[0034] The pressure plate 3 passes through the top of the frame 53 through two guide rods 11. A retaining ring is provided on the guide rod 11 outside the top of the frame 53. A spring is provided between the retaining ring and the top of the frame 53. The pressure plate 3 is tightly attached to the top of the frame 53 through the spring. The spring force here is equal to the total weight of the pressure plate 3.

[0035] When the present invention is used, first select the eccentric counterweight 5 for installation, start the drive motor 1, detect the downward pressure value output by the pressure plate 3 through the pressure detection equipment, then stop the machine, and then install the metal tube 6 to be tested, divide the pressure value by the number of the metal tubes 6 to be tested, and obtain the pressure value of each metal tube 6 to be tested, then perform an axial pressure test on the metal tube, and after the pressure test for the expected time, finally perform a flaw detector 4 on the metal tube to detect the cracking of the metal inside the metal tube under metal fatigue under the axial pressure test.

[0036] Furthermore, sensors may be arranged at the positions of the positioning grooves 9 on the base 7 to monitor the pressure exerted on the positioning grooves 9 and ensure that the axial forces exerted on the metal tubes 6 are consistent.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal pipe axial pressure fatigue test and online flaw detection equipment, characterized by: It comprises a bracket, a driving motor (1), a rotating shaft (2), a pressing plate (3), and a flaw detector (4); The support comprises a base (51) and a support (52) and a frame (53) perpendicular to the base (51); The rear end of the driving motor (1) is mounted on the bracket (52) via a spherical bearing (54); one end of the rotating shaft (2) is fixed to the power output end of the driving motor (1); and an eccentric counterweight (5) is mounted on the rotating shaft (2); The frame (53) is a frame structure facing the rotating shaft (2), and a pressing plate (3) is provided in the frame (53). The pressing plate (3) is arranged horizontally and perpendicular to the rotating shaft (2). The pressing plate (3) is limited to move slightly up and down at the top position in the frame (53), and a second joint bearing (55) is provided in the middle of the pressing plate (3); The other end of the rotating shaft (2) is connected to the second joint bearing (55), and the first joint bearing (54) and the second joint bearing (55) are arranged at the same height; A plurality of metal tubes (6) to be tested are located between the pressing plate (3) and the inner bottom of the frame (53); The frame (53) is provided with a flaw detector (4) for detecting the metal tube (6).

2. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 1 is characterized by: The frame (53) has slide rails (56) on both sides, and a base (7) is provided at the bottom of the frame (53). The base (7) moves up and down along the slide rail (56) on the corresponding side through the longitudinal grooves on both sides. A spiral lifting mechanism (8) is arranged between the base (7) and the inner bottom of the frame (53).

3. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 2 is characterized by: The spiral lifting mechanism (8) comprises a screw rod (81) at the bottom of the frame (53), a sliding seat (82) on the screw rod (81) and a connecting rod arm (83); The screw rod (81) horizontally penetrates the frame (53) and is limitedly rotatable, and the end of the screw rod (81) is a turning handle; The screw rod (81) has a forward thread and a reverse thread, and a slide seat (82) is provided on the forward thread and the reverse thread area respectively; The upper part of the slide seat (82) and the lower part of the base (7) have a hinged portion, and a connecting rod arm 1 (83) is located between the hinged portion of the slide seat (82) and the hinged portion of the base (7).

4. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 3 is characterized by: A plurality of positioning grooves (9) are arranged along the length direction at the lower part of the pressing plate (3) and the upper part of the base (7); the positioning grooves (9) are hinged to the pressing plate (3) or the base (7); the direction of the hinged movement is perpendicular to the rotating shaft (2); and the positioning grooves (9) are used to fix the ends of the metal tubes (6); The positioning grooves (9) on the pressing plate (3) and the base (7) correspond one to one.

5. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 4 is characterized by: A plurality of length balancing mechanisms (10) are provided at the lower part of the pressing plate (3) along the length direction, and the length balancing mechanisms (10) include a slide groove (101), two balancing seats (102), and a plurality of connecting rod arms (103); The channel in the slide groove (101) is parallel to the pressing plate (3), and a slider (104) is provided in the channel. The slider (104) is limited to move in the channel; Two balancing seats (102) are respectively arranged on both sides of the slide groove (101) and connected to the slide block (104) via a second connecting rod arm (103); The balancing seat (102) is hinged to the slider (104) in the slide groove (101) through a second connecting rod arm (103), and is hinged to the lower part of the pressure plate (3) through another second connecting rod arm (103); The positioning groove (9) is arranged at the bottom of the balancing seat (102).

6. A metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 4 or 5, characterized in that: The positioning groove (9) is provided with inner sleeves with various inner diameter specifications, and the inner diameter specifications of the inner sleeves are suitable for metal pipes (6) with various specifications.

7. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 6 is characterized by: The pressure plate (3) passes through the top of the frame (53) via two guide rods (11); a retaining ring is provided on the guide rod (11) outside the top of the frame (53); a spring is provided between the retaining ring and the top of the frame (53); and the pressure plate (3) is tightly attached to the top of the frame (53) via the spring.

8. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 6 is characterized by: Pulley rows (57) are provided at the frames (53) at both ends of the pressing plate (3), and the pulley rows (57) are in contact with the pressing plate (3).

9. The metal pipe axial pressure fatigue test and online flaw detection equipment according to claim 6, characterized in that: The base (7) is provided with a sensor for detecting the pressure jointly applied by the plurality of positioning grooves (9).

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