Pipe pulling test machine

Abstract

The present invention relates to a pipe pulling test machine. It includes a frame, a fixed clamping device, a movable clamping device, a movable crossbeam and a movable driving device; the fixed clamping device is fixedly installed on one longitudinal side of the frame and can clamp and fix one axial end of the pipe, the movable clamping device can clamp and fix the other axial end of the pipe, the movable crossbeam extends in the transverse direction, and the movable crossbeam is movably connected to the frame and can slide longitudinally relative to the frame, the movable driving device is installed on the frame and connected to the movable crossbeam to drive the movable crossbeam to move longitudinally; the movable clamping device is installed on the movable crossbeam; the pipe pulling test machine also includes a force sensor arranged between the movable clamping device and the movable crossbeam or between the movable crossbeam and the frame. The present invention can meet the requirements of pipe pulling test by pulling with the fixed clamping device and the movable clamping device in coordination, and collecting the test tension through the force sensor.

Description

Technical Field

[0001] The invention relates to pipe testing equipment, in particular to a pipe pulling testing machine. Background Art

[0002] Polyethylene double-wall corrugated pipe is a plastic pipe with an annular corrugated structure. Such a structural design can reflect excellent mechanical properties and ensure that the pipe has greater ring stiffness, flexibility and compressive resistance. Polyethylene double-wall corrugated pipe is mainly used for drainage, ventilation, sewage discharge, etc. in mines and buildings. However, these uses must ensure that the polyethylene double-wall corrugated pipe joints are well sealed. According to the standards and industry regulations, it is necessary to detect the longitudinal tension between the polyethylene pressure pipe and the pipe fittings. During the detection process, the sample pipe is fixed on the test instrument, and within the specified time, a constant longitudinal tension is guaranteed to detect whether the connection between the pipe and the pipe fitting falls off. If the connection falls off, the force is unqualified. However, the tensile testing machine on the market is only suitable for small-diameter polyethylene pipe styles and pipes with a diameter of no more than 63mm. The larger inner diameter pipes commonly used in the polyethylene double-wall corrugated pipe market have a diameter of 800mm, so the existing tensile testing machine cannot meet all the test requirements for the sealing of pipe joints. Summary of the invention

[0003] The purpose of the present invention is to provide a pipe pulling test machine, which can meet the requirements of pipe pulling test by pulling with the cooperation of a fixed clamping device and a movable clamping device and collecting the test tension through a force sensor.

[0004] The present invention is implemented through the following technical scheme: a pipe pulling test machine, characterized in that it includes a frame, a fixed clamping device, a movable clamping device, a movable crossbeam, and a movable driving device; the fixed clamping device is fixedly installed on one longitudinal side of the frame and can clamp and fix one axial end of the pipe, the movable clamping device can clamp and fix the other axial end of the pipe, the movable crossbeam is located on the other longitudinal side of the frame and extends in the transverse direction, and the movable crossbeam is movably connected to the frame and can slide longitudinally relative to the frame, the movable driving device is installed on the frame and connected to the movable crossbeam to drive the movable crossbeam to move longitudinally; the movable clamping device is installed on the movable crossbeam;

[0005] The pipe pulling test machine also includes a force sensor arranged between the movable clamping device and the movable crossbeam or between the movable crossbeam and the frame for detecting the magnitude of the pulling force applied by the movable clamping device to the other axial end of the pipe, and the longitudinal direction is parallel to the axial direction of the pipe.

[0006] The pipe comprises a first pipe body and a second pipe body which are sequentially arranged along the axial direction of the pipe, and a sealing connection assembly for correspondingly splicing the first pipe body and the second pipe body together; the first pipe body and the second pipe body are both corrugated pipes.

[0007] Preferably, the force sensor is connected between the movable clamping device and the movable crossbeam; the movable clamping device includes a second clamping assembly, a connecting rod and a locking nut, the second clamping assembly is used to clamp and fix the other axial end of the pipe, the movable crossbeam is also provided with a mounting hole extending in the longitudinal direction and passing through the two longitudinal side walls of the movable crossbeam, the connecting rod is passed through the mounting hole, the axial end of the connecting rod close to the pipe is fixedly connected to the second clamping assembly, the force sensor is sleeved on the outer periphery of the connecting rod and pressed against the longitudinal side wall of the movable crossbeam away from the pipe, the locking nut is threadedly connected to the connecting rod and pressed against the end wall of the side of the force sensor away from the pipe.

[0008] Preferably, the frame includes two longitudinal beams arranged at intervals in the transverse direction, and a connecting plate vertically connected between the two longitudinal beams for fixing the two longitudinal beams, the longitudinal beams extend in the longitudinal direction, and the pipe is installed between the two longitudinal beams.

[0009] Preferably, the fixed clamping device includes a fixed crossbeam installed between the two longitudinal beams, and a first clamping assembly fixedly connected to the fixed crossbeam for clamping one axial end of the pipe. The lateral ends of the movable crossbeam are respectively movably connected to the two longitudinal beams and can slide longitudinally relative to the two longitudinal beams.

[0010] In order to adapt to the clamping and installation of different pipes, the two ends of the fixed crossbeam are movably connected between the two longitudinal beams, and the fixed clamping device also includes a longitudinal adjustment component arranged between the two longitudinal beams and the ends of the fixed crossbeam for adjusting the longitudinal position of the fixed crossbeam relative to the longitudinal beam to adapt to the clamping and installation of pipes of different lengths.

[0011] Preferably, the longitudinal adjustment component includes two groups of first locking pin through hole groups arranged on the two longitudinal beams, each group of first locking pin through hole groups includes a plurality of first locking pin through holes arranged on the corresponding longitudinal beams at intervals along the longitudinal direction and penetrating the two lateral side walls of the corresponding longitudinal beams, the longitudinal adjustment component also includes two second locking pin holes which are arranged at the two lateral ends of the fixed beam and can be connected to the corresponding first locking pin through holes on the two longitudinal beams, and two positioning pins which are respectively passed through and fixed in the corresponding two pairs of first locking pin through holes and second locking pin holes.

[0012] In order to facilitate the longitudinal adjustment of the fixed crossbeam, the fixed clamping device also includes a roller matching assembly that facilitates the longitudinal adjustment of the fixed crossbeam;

[0013] The roller matching assembly includes two connecting seats respectively arranged at the two transverse ends of the fixed crossbeam, two rolling guide rails respectively arranged on the two longitudinal beams and extending in the longitudinal direction, and two groups of roller groups respectively rotatably connected to the two connecting seats and capable of movably cooperating with the corresponding rolling guide rails located on the longitudinal beams for guidance, each group of roller groups includes more than one roller whose axis extends in the transverse direction, and when the number of rollers in the roller group is more than two, the rollers are arranged at intervals in the longitudinal direction;

[0014] The rolling guide is a round rod extending in the longitudinal direction. The middle part of the outer peripheral wall of the roller is provided with an annular groove which is arranged around the roller axis and is recessed in the radial direction of the roller toward the axis. The annular groove of the roller can be embedded in the corresponding rolling guide and movably cooperate with the rolling guide for guidance.

[0015] Preferably, the movable driving device comprises two screw rods respectively connected to the two longitudinal beams and extending in the longitudinal direction, two nuts respectively threadedly connected to the two screw rods, a screw rod driving assembly for driving the two screw rods to rotate synchronously, and two groups of guide rod groups arranged on the two longitudinal beams and extending in the longitudinal direction and located beside the corresponding screw rods, the transverse ends of the movable crossbeam are respectively fixedly connected to the two nuts, and the transverse ends of the movable crossbeam are also respectively guided by the two groups of guide rod groups;

[0016] Each guide rod group includes more than one guide rod. When there are two guide rods in each guide rod group, the two guide rods are respectively located above and below the corresponding screw rod.

[0017] Preferably, the screw drive assembly includes a fixed seat for mounting two screws, two screw pulleys coaxially fixedly mounted on the input ends of the two screws, a drive motor and its transmission assembly fixedly mounted on the fixed seat, an output pulley fixedly mounted on the output shaft of the drive motor and its transmission assembly, and a transmission belt connected between the two screw pulleys and the output pulley. The drive motor and its transmission assembly include a servo motor and a worm gear reducer.

[0018] Preferably, the screw drive assembly further comprises a tensioning assembly for tensioning the transmission belt;

[0019] The output pulley is located between the two screw pulleys, and the tensioning assembly includes a first tensioning pulley rotatably connected to a fixed seat and located between the output pulley and one of the screw pulleys, and transmitting and pressing against the lower surface of the lower layer of the transmission belt; and a second tensioning pulley rotatably connected to a fixed seat and located between the output pulley and the other screw pulley, and transmitting and pressing against the upper surface of the upper layer of the transmission belt.

[0020] In order to facilitate the clamping and fixing of pipes of different diameters, the first clamping assembly and the second clamping assembly each include a positioning plate installed on a fixed crossbeam or a movable crossbeam, and a chuck fixedly installed on the positioning plate for clamping and fixing the axial ends of the pipe on the positioning plate respectively;

[0021] The pipe material is a corrugated tube composed of wave crests and wave troughs alternately arranged in sequence along the axial direction. The center lines of the two positioning disks and the chucks thereon are all in the same longitudinal direction. Each positioning disk is provided with more than two groups of locking through-hole groups. Each group of locking through-hole groups includes a plurality of first locking through-holes arranged in sequence and at intervals along the same circumferential direction surrounding the central axis of the positioning disk. The diameters of the circumferences of the groups of locking through-hole groups are different. Each first locking through-hole passes through the disk surfaces at both ends of the axial direction of the positioning disk in a direction parallel to the center of the positioning disk.

[0022] The chuck includes more than two arc-shaped clamping plates which are coaxially arranged with the positioning plate and are arranged at different circumferential positions on the outer circumference of the pipe. The inner side of the arc-shaped clamping plate can extend into a trough of the pipe. The arc-shaped clamping plate is also provided with a plurality of second locking through holes which are arranged in sequence and spaced apart in the circumferential direction around the central axis of the positioning plate at a position close to the outer edge line. The second locking through holes penetrate the axial side end walls of the arc-shaped clamping plate in a direction parallel to the center of the arc-shaped clamping plate. Each second locking through hole can be correspondingly connected with each first locking through hole on the corresponding positioning plate, and the corresponding second locking through holes and the first locking through holes are locked and fixed by fastening bolts.

[0023] The positioning plate of the first clamping assembly is fixedly connected to the fixed crossbeam, and the positioning plate of the second clamping assembly is coaxially fixedly connected to an axial end of the connecting rod close to the pipe.

[0024] Preferably, each chuck includes two semicircular arc-shaped chuck plates.

[0025] Preferably, the pipe pulling test machine further comprises a sliding protective cover which is slidably connected to the two longitudinal beams along the longitudinal direction and is located above the pipe.

[0026] Preferably, the frame further comprises two screw rod shields respectively covering the outer peripheries of the two screw rod groups and the guide rod group, and a motor shield covering the screw rod drive assembly.

[0027] Compared with the previous technology, the beneficial effects of the present invention are:

[0028] 1. The present invention provides a pipe pulling test machine, which can meet the requirements of pipe pulling test by pulling with the cooperation of a fixed clamping device and a movable clamping device and collecting the test tension through a force sensor.

[0029] 2. The pipe drawing test machine of the present invention adopts a horizontal double-arm structure, which is easy to install for larger double-wall corrugated pipes and has strong overall structural rigidity.

[0030] 3. The present invention is a pipe pulling test machine, which adopts servo motor, belt drive and ball screw drive, and has the advantages of high precision, stable transmission, small force value error, etc. And the guide rod is used for guidance, which eliminates the shaking phenomenon during the movement of the movable crossbeam, is conducive to improving the stability of the structure, and lays the foundation for obtaining accurate test force values.

[0031] 4. The present invention provides a pipe drawing tester, which can adjust the stretching space according to the length of different pipes, adjust the fixed beam in a large range, and adjust the movable beam in a small range. The fixed beam is also equipped with a roller, which cooperates with the rolling guide rail for guidance, and the adjustment is convenient and quick.

[0032] 5. The present invention provides a pipe pulling test machine, wherein the second clamping assembly and the first clamping assembly are both composed of a positioning plate and a chuck, and the positioning plate is provided with a plurality of locking through-hole groups that can adapt to the fixed installation of pipes of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional structure diagram of a pipe drawing test machine of the present invention Figure 1 ;

[0034] Figure 2 A three-dimensional structure diagram of a pipe drawing test machine of the present invention Figure 2 ;

[0035] Figure 3 A three-dimensional structure diagram of a pipe drawing test machine of the present invention Figure 3 ;

[0036] Figure 4 A three-dimensional structure diagram of a pipe drawing test machine of the present invention Figure 4 ;

[0037] Figure 5 The structure diagram of the first clamping assembly and the second clamping assembly in a pipe pulling test machine of the present invention is shown in FIG. Figure 1 ;

[0038] Figure 6 The structure diagram of the first clamping assembly and the second clamping assembly in a pipe pulling test machine of the present invention is shown in FIG. Figure 2 .

[0039] Explanation of reference numerals: 1-frame, 11-longitudinal beam, 12-connecting plate, 13-screw guard, 14-motor guard, 2-fixed clamping device, 21-fixed crossbeam, 22-first clamping assembly, 23-longitudinal adjustment assembly, 231-first lock pin through hole, 232-positioning pin, 24-roller matching assembly, 241-connecting seat, 242-rolling guide rail, 243-roller, 2431-annular groove, 3-movable clamping device, 31-second clamping assembly, 32-connecting rod, 33-locking nut, 4-movable driving device, 41-screw, 42-nut, 43 -screw drive assembly, 431-fixed seat, 432-screw pulley, 433-drive motor and its transmission assembly, 434-output pulley, 435-transmission belt, 436-first tensioning wheel, 437-second tensioning wheel, 44-guide rod, 5-force sensor, 51-connecting rod, 52-locking nut, 6-positioning plate, 61-locking through hole group, 7-chuck, 71-arc-shaped clamping plate, 711-second locking through hole, 8-fastening bolt, 9-sliding protective cover, a-pipe, a1-first tube body, a2-second tube body, a3-sealing connection assembly, b-movable crossbeam. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with the accompanying drawings:

[0041] like Figure 1-6 As shown, a pipe pulling test machine is characterized in that it includes a frame 1, a fixed clamping device 2, a movable clamping device 3, a movable crossbeam b, and a movable driving device 4; the fixed clamping device 2 is fixedly installed on one longitudinal side of the frame 1 and can clamp and fix one axial end of the pipe a, the movable clamping device 3 can clamp and fix the other axial end of the pipe a, the movable crossbeam b is located on the other longitudinal side of the frame 1 and extends in the transverse direction, and the movable crossbeam b is movably connected to the frame 1 and can slide longitudinally relative to the frame 1, the movable driving device 4 is installed on the frame 1 and connected to the movable crossbeam b to drive the movable crossbeam b to move longitudinally; the movable clamping device 3 is installed on the movable crossbeam b;

[0042] The pipe pulling test machine also includes a force sensor 5 arranged between the movable clamping device 3 and the movable beam b or between the movable beam b and the frame 1 for detecting the magnitude of the pulling force applied by the movable clamping device 3 to the other axial end of the pipe a, and the longitudinal direction is parallel to the axial direction of the pipe a.

[0043] The pipe a comprises a first pipe body a1 and a second pipe body a2 sequentially arranged along the axial direction of the pipe a, and a sealing connection assembly a3 for correspondingly splicing the first pipe body a1 and the second pipe body a2 together. The first pipe body a1 and the second pipe body a2 are both corrugated pipes.

[0044] Preferably, the force sensor 5 is connected between the movable clamping device 3 and the movable beam b; the movable clamping device 3 includes a second clamping assembly 31, a connecting rod 32 and a locking nut 33, the second clamping assembly 31 is used to clamp and fix the other axial end of the tube a, the movable beam b is also provided with a mounting hole extending in the longitudinal direction and passing through the two longitudinal side walls of the movable beam b, the connecting rod 32 is passed through the mounting hole, the axial end of the connecting rod 32 close to the tube a is fixedly connected to the second clamping assembly 31, the force sensor 5 is sleeved on the outer periphery of the connecting rod 32 and pressed on the longitudinal side wall of the movable beam b away from the tube a, the locking nut 33 is threadedly connected to the connecting rod 32 and pressed on the end wall of the side of the force sensor 5 away from the tube a.

[0045] Preferably, the frame 1 includes two longitudinal beams 11 arranged at intervals in the transverse direction, and a connecting plate 12 vertically connected between the two longitudinal beams 11 for fixing the two longitudinal beams 11, the longitudinal beams 11 extend in the longitudinal direction, and the pipe a is installed between the two longitudinal beams 11.

[0046] Preferably, the fixed clamping device 2 includes a fixed crossbeam 21 installed between the two longitudinal beams 11, and a first clamping assembly 22 fixedly connected to the fixed crossbeam 21 for clamping and fixing one axial end of the tube a. The lateral ends of the movable crossbeam b are respectively movably connected to the two longitudinal beams 11 and can slide longitudinally relative to the two longitudinal beams 11.

[0047] In order to adapt to the clamping and installation of different pipes, the two ends of the fixed beam 21 are movably connected between the two longitudinal beams 11, and the fixed clamping device 2 also includes a longitudinal adjustment component 23 arranged between the two longitudinal beams 11 and the ends of the fixed beam 21 for adjusting the longitudinal position of the fixed beam 21 relative to the longitudinal beam 11 to adapt to the clamping and installation of pipes a of different lengths.

[0048] Preferably, the longitudinal adjustment component 23 includes two groups of first lock pin through hole groups arranged on the two longitudinal beams 11, and each group of first lock pin through hole groups includes a plurality of first lock pin through holes 231 arranged on the corresponding longitudinal beam 11 at intervals in the longitudinal direction and penetrating the two lateral side walls of the corresponding longitudinal beam 11. The longitudinal adjustment component 23 also includes two second lock pin holes which are arranged at the two lateral ends of the fixed cross beam 21 and can be connected to the corresponding first lock pin through holes 231 on the two longitudinal beams 11, and two positioning pins 232 which are respectively penetrated and fixed in the corresponding two pairs of first lock pin through holes 231 and second lock pin holes.

[0049] In order to facilitate the longitudinal adjustment of the fixed beam, the fixed clamping device 2 also includes a roller matching assembly 24 for facilitating the longitudinal adjustment of the fixed beam 21;

[0050] The roller matching assembly 24 includes two connecting seats 241 respectively arranged at the two transverse ends of the fixed crossbeam 21, two rolling guide rails 242 respectively arranged on the two longitudinal beams 11 and extending in the longitudinal direction, and two groups of roller groups respectively rotatably connected to the two connecting seats 241 and capable of movably matching and guiding with the corresponding rolling guide rails 242 located on the longitudinal beam 11, each group of roller groups includes more than one roller 243 with an axis extending in the transverse direction, and when the number of rollers 243 in the roller group is more than two, each roller 243 is arranged at intervals in the longitudinal direction;

[0051] The rolling guide rail 242 is a round rod extending in the longitudinal direction. The middle part of the outer peripheral wall of the roller 243 is provided with an annular groove 2431 which is arranged around the axis of the roller 243 and is recessed in the radial direction of the roller 243 close to the axis. The annular groove 2431 of the roller 243 can be embedded in the corresponding rolling guide rail 242 and movably cooperate with the rolling guide rail 242 for guidance.

[0052] Preferably, the movable driving device 4 comprises two screw rods 41 respectively connected to the two longitudinal beams 11 and extending in the longitudinal direction, two nuts 42 respectively threadedly connected to the two screw rods 41, a screw driving assembly 43 for driving the two screw rods 41 to rotate synchronously, and two groups of guide rod groups arranged on the two longitudinal beams 11 and extending in the longitudinal direction and located beside the corresponding screw rods 41, the transverse ends of the movable cross beam b are respectively fixedly connected to the two nuts 42, and the transverse ends of the movable cross beam b are also respectively guided by the two groups of guide rod groups;

[0053] Each guide rod group includes at least one guide rod 44 . When there are two guide rods 44 in each guide rod group, the two guide rods 44 are respectively located above and below the corresponding screw rod 41 .

[0054] Preferably, the screw drive assembly 43 includes a fixed seat 431 for mounting two screws 41, two screw pulleys 432 coaxially fixedly mounted on the input ends of the two screws 41, a drive motor and a transmission assembly 433 fixedly mounted on the fixed seat 431, an output pulley 434 fixedly mounted on the output shaft of the drive motor and its transmission assembly 433, and a transmission belt 435 connected between the two screw pulleys 432 and the output pulley 434. The drive motor and its transmission assembly 433 include a servo motor and a worm gear reducer.

[0055] Preferably, the screw drive assembly 43 further includes a tensioning assembly for tensioning the transmission belt 435;

[0056] The output pulley 434 is located between the two screw pulleys 432, and the tensioning assembly includes a first tensioning pulley 436 that is rotatably connected to the fixed seat 431 and is located between the output pulley 434 and one of the screw pulleys 432, and is pressed against the lower surface of the lower layer of the transmission belt 435; and a second tensioning pulley 437 that is rotatably connected to the fixed seat 431 and is located between the output pulley 434 and the other screw pulley 432, and is pressed against the upper surface of the upper layer of the transmission belt 435.

[0057] In order to facilitate the clamping and fixing of pipes of different diameters, the first clamping assembly 22 and the second clamping assembly 31 both include a positioning plate 6 mounted on the fixed crossbeam 21 or the movable crossbeam b, and a chuck 7 fixedly mounted on the positioning plate 6 for clamping and fixing the axial ends of the pipe a on the positioning plate 6 respectively;

[0058] The pipe material a is a corrugated tube composed of wave crests and wave troughs alternately arranged in sequence along the axial direction. The center lines of the two positioning disks 6 and the chucks 7 thereon are all in the same longitudinal direction. Each positioning disk 6 is provided with more than two groups of locking through hole groups 61. Each group of locking through hole groups 61 includes a plurality of first locking through holes arranged in sequence along the same circumferential direction around the central axis of the positioning disk 6. The diameters of the circumferences of the groups of locking through hole groups 61 are different. Each first locking through hole penetrates the disk surfaces at both ends of the axial direction of the positioning disk 6 in a direction parallel to the center of the positioning disk 6.

[0059] The chuck 7 includes more than two arc-shaped clamping plates 71 which are coaxially arranged with the positioning plate 6 and are arranged at different circumferential positions of the outer circumference of the tube a. The inner side of the arc-shaped clamping plate 71 can extend into a trough of the tube a. The arc-shaped clamping plate 71 is also provided with a plurality of second locking through holes 711 arranged in sequence and spaced apart along the circumferential direction around the central axis of the positioning plate 6 at a position close to the outer edge line. The second locking through holes 711 penetrate the axial side end walls of the arc-shaped clamping plate 71 along a direction parallel to the center of the arc-shaped clamping plate 71. Each second locking through hole 711 can be correspondingly connected with each first locking through hole on the corresponding positioning plate 6, and the corresponding second locking through hole 711 and the first locking through hole are locked and fixed by a fastening bolt 8.

[0060] The positioning plate 6 of the first clamping assembly 22 is fixedly connected to the fixed crossbeam 21 , and the positioning plate 6 of the second clamping assembly 31 is coaxially fixedly connected to one axial end of the connecting rod 32 close to the pipe a.

[0061] Preferably, each chuck 7 includes two semicircular arc-shaped chuck plates 71 .

[0062] Preferably, the pipe pulling test machine further comprises a sliding protective cover 9 which is slidably connected to the two longitudinal beams 11 along the longitudinal direction and is located above the pipe a.

[0063] Preferably, the frame 1 further comprises two screw shields 13 respectively covering the outer peripheries of the two screw rods 41 and the guide rod group, and a motor shield 14 covering the screw drive assembly 43 .

[0064] Although the present invention is illustrated and described by specific embodiments and their alternatives, it should be understood that various changes and modifications within the spirit and scope of the present invention can be implemented. Therefore, it should be understood that the present invention is not limited in any sense except by the limitations of the attached claims and their equivalents.

Claims

1. A pipe pulling test machine, characterized in that: The invention comprises a frame (1), a fixed clamping device (2), a movable clamping device (3), a movable crossbeam (b), and a movable driving device (4); the fixed clamping device (2) is fixedly mounted on one longitudinal side of the frame (1) and can clamp and fix one axial end of the pipe (a); the movable clamping device (3) can clamp and fix the other axial end of the pipe (a); the movable crossbeam (b) is located on the other longitudinal side of the frame (1) and extends in the transverse direction; the movable crossbeam (b) is movably connected to the frame (1) and can slide longitudinally relative to the frame (1); the movable driving device (4) is mounted on the frame (1) and connected to the movable crossbeam (b) to drive the movable crossbeam (b) to move longitudinally; the movable clamping device (3) is mounted on the movable crossbeam (b); The pipe pulling test machine also includes a force sensor (5) arranged between the movable clamping device (3) and the movable crossbeam (b) or between the movable crossbeam (b) and the frame (1) for detecting the magnitude of the pulling force applied by the movable clamping device (3) to the other axial end of the pipe (a), wherein the longitudinal direction is parallel to the axial direction of the pipe (a); The frame (1) comprises two longitudinal beams (11) arranged at intervals in a transverse direction, and a connecting plate (12) vertically connected between the two longitudinal beams (11) for fixing the two longitudinal beams (11), the longitudinal beams (11) extending in a longitudinal direction, and the pipe (a) is installed between the two longitudinal beams (11); The fixed clamping device (2) comprises a fixed crossbeam (21) installed between the two longitudinal beams (11), and a first clamping assembly (22) fixedly connected to the fixed crossbeam (21) and used to clamp and fix one axial end of the pipe (a); the transverse ends of the movable crossbeam (b) are respectively movably connected to the two longitudinal beams (11) and can slide longitudinally relative to the two longitudinal beams (11); The two ends of the fixed crossbeam (21) are movably connected between the two longitudinal beams (11), and the fixed clamping device (2) further comprises a longitudinal adjustment component (23) disposed between the two longitudinal beams (11) and the ends of the fixed crossbeam (21) for adjusting the longitudinal position of the fixed crossbeam (21) relative to the longitudinal beam (11) to adapt to the clamping and installation of pipes (a) of different lengths; The longitudinal adjustment component (23) comprises two groups of first lock pin through hole groups arranged on the two longitudinal beams (11), each group of first lock pin through hole groups comprises a plurality of first lock pin through holes (231) arranged at intervals along the longitudinal direction on the corresponding longitudinal beam (11) and penetrating the two lateral side walls of the corresponding longitudinal beam (11), the longitudinal adjustment component (23) further comprises two second lock pin holes arranged at the lateral ends of the fixed cross beam (21) and capable of being connected to the corresponding first lock pin through holes (231) on the two longitudinal beams (11), and two positioning pins (232) respectively inserted and fixed in the corresponding two pairs of first lock pin through holes (231) and second lock pin holes; The fixing clamping device (2) further comprises a roller matching assembly (24) for facilitating longitudinal adjustment of the fixing crossbeam (21); The roller matching assembly (24) comprises two connecting seats (241) respectively arranged at the two lateral ends of the fixed crossbeam (21), two rolling guide rails (242) respectively arranged on the two longitudinal beams (11) and extending in the longitudinal direction, and two groups of roller groups respectively rotatably connected to the two connecting seats (241) and capable of movably matching and guiding with the corresponding rolling guide rails (242) located on the longitudinal beam (11), each group of roller groups comprises more than one roller (243) whose axis extends in the lateral direction, and when the number of rollers (243) in the roller group is more than two, the rollers (243) are arranged at intervals in the longitudinal direction; The rolling guide rail (242) is a round rod extending in the longitudinal direction. The outer peripheral wall of the roller (243) is provided with an annular groove (2431) in the middle thereof, which is arranged around the axis of the roller (243) and is recessed in the radial direction of the roller (243) toward the axis. The annular groove (2431) of the roller (243) can be embedded in the corresponding rolling guide rail (242) and can be movably matched with the rolling guide rail (242) for guidance. The movable driving device (4) comprises two screw rods (41) respectively connected to the two longitudinal beams (11) and extending in the longitudinal direction, two nuts (42) respectively threadedly connected to the two screw rods (41), a screw rod driving assembly (43) for driving the two screw rods (41) to rotate synchronously, and two groups of guide rod groups arranged on the two longitudinal beams (11) and extending in the longitudinal direction and located beside the corresponding screw rods (41), the transverse ends of the movable crossbeam (b) are respectively fixedly connected to the two nuts (42), and the transverse ends of the movable crossbeam (b) are also respectively guided by the two groups of guide rod groups; each group of guide rod groups includes more than one guide rod (44); The screw drive assembly (43) comprises a fixed seat (431) for mounting two screws (41), two screw pulleys (432) coaxially fixedly mounted on the input ends of the two screws (41), a drive motor and a transmission assembly (433) fixedly mounted on the fixed seat (431), an output pulley (434) fixedly mounted on the output shaft of the drive motor and its transmission assembly (433), and a transmission belt (435) connected between the two screw pulleys (432) and the output pulley (434); The screw drive assembly (43) further comprises a tensioning assembly for tensioning the transmission belt (435); The output pulley (434) is located between the two screw pulleys (432), and the tensioning assembly comprises a first tensioning wheel (436) rotatably connected to the fixed seat (431), located between the output pulley (434) and one of the screw pulleys (432), and transmitting and pressing against the lower surface of the lower layer of the transmission belt (435); and a second tensioning wheel (437) rotatably connected to the fixed seat (431), located between the output pulley (434) and the other screw pulley (432), and transmitting and pressing against the upper surface of the upper layer of the transmission belt (435); The first clamping assembly (22) and the second clamping assembly (31) both comprise a positioning plate (6) mounted on a fixed crossbeam (21) or a movable crossbeam (b), and a chuck (7) fixedly mounted on the positioning plate (6) and used to clamp and fix the axial ends of the pipe (a) on the positioning plate (6) respectively; The pipe (a) is a corrugated tube composed of wave crests and wave troughs arranged alternately in sequence along the axial direction, the center lines of the two positioning disks (6) and the chucks (7) thereon are all in the same longitudinal direction, each positioning disk (6) is provided with more than two groups of locking through hole groups (61), each group of locking through hole groups (61) includes a plurality of first locking through holes arranged in sequence along the same circumferential direction around the central axis of the positioning disk (6), the diameters of the circumferences of the groups of locking through hole groups (61) are different, and each first locking through hole penetrates the disk surface of the positioning disk (6) at both ends of the axial direction in a direction parallel to the center of the positioning disk (6); The chuck (7) comprises two or more arc-shaped clamping plates (71) which are coaxially arranged with the positioning plate (6) and are arranged at different circumferential positions of the outer circumference of the pipe (a); the inner side of the arc-shaped clamping plate (71) can extend into a wave valley of the pipe (a); the arc-shaped clamping plate (71) is also provided with a plurality of second locking through holes (711) which are arranged in sequence and spaced apart in a circumferential direction around the central axis of the positioning plate (6) at a position close to the outer edge line; the second locking through holes (711) penetrate the axial side end walls of the arc-shaped clamping plate (71) in a direction parallel to the center of the arc-shaped clamping plate (71); each second locking through hole (711) can be correspondingly connected with each first locking through hole on the corresponding positioning plate (6); and the corresponding second locking through hole (711) and the first locking through hole are locked and fixed by a fastening bolt (8); Adjust the stretching space according to the length of different types of pipes, adjust the fixed beam in a large range, and adjust the movable beam in a small range.

2. The pipe pulling test machine according to claim 1, characterized in that: The force sensor (5) is connected between the movable clamping device (3) and the movable crossbeam (b); the movable clamping device (3) comprises a second clamping assembly (31), a connecting rod (32) and a locking nut (33); the second clamping assembly (31) is used to clamp and fix the other axial end of the pipe (a); the movable crossbeam (b) is also provided with a mounting through hole extending in the longitudinal direction and penetrating the two longitudinal side walls of the movable crossbeam (b); the connecting rod (32) is inserted into the mounting through hole; the axial end of the connecting rod (32) close to the pipe (a) is fixedly connected to the second clamping assembly (31); the force sensor (5) is sleeved on the outer periphery of the connecting rod (32) and pressed against the longitudinal side wall of the movable crossbeam (b) away from the pipe (a); the locking nut (33) is threadedly connected to the connecting rod (32) and pressed against the end wall of the force sensor (5) away from the pipe (a).

3. The pipe pulling test machine according to claim 1, characterized in that: Each chuck (7) comprises two semicircular arc-shaped chuck plates (71).

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