CN214408477U - Bending test device of welding sample - Google Patents

Abstract

The utility model relates to a test device field discloses a bending test device of welding sample. The bending test device for the welding sample comprises a rotary table, a constant pressure roller, a dynamic pressure roller and a clamping assembly. The turntable can rotate around the axis of the turntable. The constant pressure roller is coaxially arranged at the circle center of the turntable. The dynamic pressure roller and the constant pressure roller are arranged in parallel at intervals and are arranged on the same side of the turntable. The clamping assembly comprises a swing arm, a U-shaped frame and a hydraulic cylinder, wherein the U-shaped frame is arranged at one end of the swing arm and comprises a first straight arm and a second straight arm which are arranged oppositely, the first straight arm and the second straight arm are arranged on two sides of the swing arm respectively, a cylinder body of the hydraulic cylinder is fixed on the second straight arm, and a piston rod of the hydraulic cylinder penetrates through the second straight arm and abuts against the swing arm. The utility model discloses can adjust the clamp force size to the welding sample, also be applicable to different width dimension's welding sample, enlarge test device's application scope, guarantee that bending test's in-process welding sample does not slide, improve the accuracy of test result.

Description

Bending test device of welding sample

Technical Field

The utility model relates to a test device field especially relates to a bending test device of welding sample.

Background

The bending test is the main method for testing the ductility of the welded joint and is generally divided into a support roll bending mode and a roller bending mode. The roller type bending test is suitable for conventional material detection, and the roller type bending test is mainly used for detecting welding joints of aluminum alloy, high-strength steel or dissimilar steel. At present, a roller type bending test mainly comprises clamping a welding sample by a clamp, selecting a proper dynamic pressure roller according to the size of a sample and the specification of a fixed pressure roller, fixing the fixed pressure roller at the center of a circle of a turntable, arranging the dynamic pressure roller and the fixed pressure roller at intervals, fixing the dynamic pressure roller on the turntable, arranging the welding sample in the intervals, rotating the dynamic pressure roller by taking the axis of the fixed pressure roller as the center, and applying pressure to the welding sample to enable the welding sample to be gradually bent along the fixed pressure roller. At present, when carrying out the roller bending test to different welding samples, anchor clamps need provide different clamp force, if anchor clamps can not provide suitable clamp force, then lead to welding sample to produce at bending test's in-process and slide, lead to the accuracy of test result relatively poor, realize providing different clamp force through changing different anchor clamps usually, the operation is complicated, and the time is longer, and the practicality is lower, and application scope is less, has improved test cost.

In view of the above, there is a need for a bending test apparatus for a welding sample to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bending test device of welding sample can adjust the clamp force size to the welding sample, avoids the welding sample to slide, has improved the accuracy of test result, shortens operating time, has improved the practicality, has reduced test cost, has enlarged application scope.

To achieve the purpose, the utility model adopts the following technical proposal:

a bending test device for a welding sample, comprising:

the rotary table can rotate around the axis of the rotary table;

the fixed compression roller is coaxially arranged at the circle center of the turntable;

the dynamic pressure roller is parallel to the constant pressure roller and arranged at intervals and is arranged on the same side of the turntable;

the clamping assembly comprises a swing arm, a U-shaped frame and a hydraulic cylinder, the U-shaped frame is arranged at one end of the swing arm and comprises a first straight arm and a second straight arm which are arranged oppositely, the first straight arm and the second straight arm are respectively arranged at two sides of the swing arm, a cylinder body of the hydraulic cylinder is fixed on the second straight arm, and a piston rod of the hydraulic cylinder penetrates through the second straight arm and abuts against the swing arm;

one end of the welding sample can be arranged between the first straight arm and the swing arm, and the other end of the welding sample can penetrate through the interval between the pressure roller and the movable pressure roller and is tangent to the pressure roller.

Preferably, the bending test device of welding sample still includes adjusting part, adjusting part includes connecting rod and connecting seat, the connecting seat is fixed on the carousel, the one end of connecting rod connect in the dynamic pressure roller, just the connecting rod wears to establish the connecting seat and can follow self axis for the connecting seat removes.

Preferably, the side wall of the connecting rod is provided with an external thread, the connecting seat is provided with a threaded hole, and the connecting rod is in threaded connection with the threaded hole.

Preferably, a connecting block is fixed at the end part of the connecting rod facing the movable pressure roller, and the connecting block is detachably connected with the movable pressure roller.

Preferably, the clamping assembly further comprises a driving motor, the driving motor is arranged at an interval with the turntable, an output rotating shaft of the driving motor is connected to the other end of the swing arm, and the output rotating shaft is parallel to the axis of the fixed pressing roller.

Preferably, the clamping assembly further comprises a positioning column, the swing arm is provided with a positioning hole, one end of the positioning column is arranged in the positioning hole, and the other end of the positioning column penetrates through the U-shaped frame.

Preferably, the swing arm is provided with a plurality of positioning holes at equal intervals along the length direction, and the positioning column can be selectively placed in one of the positioning holes.

Preferably, the U-shaped frame further comprises a connecting plate connected between the first straight arm and the second straight arm, a waist-shaped hole is formed in the connecting plate, the positioning column penetrates through the waist-shaped hole, and the positioning column can slide along the waist-shaped hole to change the distance between the first straight arm and the swing arm.

Preferably, the bending test device for the welding sample further comprises a first limiting part and a second limiting part, the first limiting part is used for limiting the rotation angle of the turntable, and the second limiting part is used for limiting the rotation angle of the swing arm.

Preferably, the bending test device for the welding sample further comprises a graduated scale, and the graduated scale can slide along the extension direction of the swing arm to measure the distance from the middle point of the welding seam on the welding sample to the tangent point of the welding sample and the constant pressure roller.

The utility model has the advantages that: the utility model discloses set up swing arm and U type frame and form the anchor clamps that are used for centre gripping welding sample, adopt the pneumatic cylinder to exert the power supply of pressure to the welding sample for the centre gripping subassembly, when the piston rod of pneumatic cylinder is flexible, can adjust the distance between first straight arm and the swing arm, can be applicable to not unidimensional welding sample, when welding sample arranges in between first straight arm and the swing arm, also can exert the butt force of equidimension not to the swing arm through the pneumatic cylinder, make the clamp force to the welding sample that produces between swing arm and the U type frame change, avoided welding sample to produce in the test process and slided, the accuracy of test result has been improved, and the easy operation of adjustment clamp force, operating time has been shortened, the practicality has been improved, the application scope of testing device has been enlarged, need not prepare different anchor clamps, the test cost has been reduced. The hydraulic cylinder is used, so that the automation degree of the testing device is improved, and the use convenience is improved.

The utility model discloses set up adjusting part, the connecting seat is fixed on the carousel, and the connecting rod is worn to establish the connecting seat and is connected in dynamic pressure roller, and the connecting rod can be followed the relative connecting seat of axis and removed, can adjust the interval size between dynamic pressure roller and the level pressure roller for test device is applicable to multiple width size's welding sample, and easy operation, has shortened operating time, has improved the practicality, has enlarged test device's application scope, need not prepare not unidimensional dynamic pressure roller, has reduced test cost.

The utility model discloses a plurality of locating holes are seted up to the equidistant of swing arm, and the reference column can be selective arrange in one of them locating hole. The U-shaped frame can change the position on the swing arm according to the welding sample of different length by setting up a plurality of locating holes for the clamping component can the welding sample of different length of centre gripping, also can adjust the clamping position on same welding sample, has enlarged application scope, has improved the practicality.

Drawings

Fig. 1 is a plan view of a bending test apparatus for a welding sample according to an embodiment of the present invention;

fig. 2 is a schematic partial structural diagram of a bending test apparatus for a welding sample according to an embodiment of the present invention.

In the figure:

10. welding a sample; 101. welding seams;

1. a turntable; 2. a compression roller is fixed; 3. a movable pressure roller;

4. an adjustment assembly; 41. a connecting rod; 411. rotating the handle; 412. connecting blocks; 42. a connecting seat;

5. a clamping assembly; 51. swinging arms; 511. positioning holes; 512. a T-shaped groove; 52. an output shaft; 53. a U-shaped frame; 531. a first straight arm; 532. a second straight arm; 533. a connecting plate; 5331. a waist-shaped hole; 54. a hydraulic cylinder; 541. a piston rod; 542. a cylinder body; 55. a positioning column; 56. a pipeline; 57. a metal splint;

6. a first limit piece; 7. a second limiting member; 8. a graduated scale.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The embodiment provides a bending test device for a welding sample. Specifically, as shown in fig. 1 to 2, the bending test apparatus of the welding sample includes: a rotary table 1, a constant pressure roller 2, a dynamic pressure roller 3 and a clamping component 5. The turntable 1 can rotate around the axis thereof; the fixed compression roller 2 is coaxially arranged at the circle center of the turntable 1; the dynamic pressure roller 3 and the fixed pressure roller 2 are arranged in parallel at intervals and are arranged at the same side of the turntable 1; the clamping assembly 5 comprises a swing arm 51, a U-shaped frame 53 and a hydraulic cylinder 54, wherein the U-shaped frame 53 is arranged at one end of the swing arm 51 and comprises a first straight arm 531 and a second straight arm 532 which are oppositely arranged, the first straight arm 531 and the second straight arm 532 are respectively arranged at two sides of the swing arm 51, a cylinder body 542 of the hydraulic cylinder 54 is fixed on the second straight arm 532, and a piston rod 541 of the hydraulic cylinder 54 penetrates through the second straight arm 532 and abuts against the swing arm 51; one end of the welding sample 10 can be interposed between the first straight arm 531 and the swing arm 51, and the other end of the welding sample 10 can pass through the space between the stationary pressure roller 2 and the movable pressure roller 3 and be tangent to the stationary pressure roller 2. The swing arm 51 and the U-shaped frame 53 are arranged to form a clamp for clamping the welding sample 10, the hydraulic cylinder 54 is used as a power source for applying pressure to the welding sample 10 by the clamping assembly 5, when the piston rod 541 of the hydraulic cylinder 54 extends and contracts, the distance between the first straight arm 531 and the swing arm 51 can be adjusted, the clamp can be suitable for welding samples 10 with different sizes, when the welding sample 10 is arranged between the first straight arm 531 and the swing arm 51, the hydraulic cylinder 54 can also apply abutting force with different sizes to the swing arm 51, so that the clamping force generated between the swing arm 51 and the U-shaped frame 53 to the welding sample 10 is changed therewith, the sliding of the welding sample 10 in the test process is avoided, the accuracy of the test result is improved, the operation of adjusting the clamping force is simple, the operation time is shortened, the practicability is improved, the application range of the test device is expanded, and different clamps do not need to be prepared, the test cost is reduced. The hydraulic cylinder 54 is used, so that the automation degree of the testing device is improved, and the use convenience is improved. The hydraulic cylinder 54 is connected to the oil supply container through a pipe 56, and the operation of the hydraulic cylinder 54 is conventional and will not be described herein.

In this embodiment, the metal plates 57 are provided on both the inner side wall of the first straight arm 531 and the side wall of the swing arm 51 facing the welding sample 10, and the metal plates 57 are made of cemented carbide, which improves durability. The metal clamping plate 57 is detachably connected with the U-shaped frame 53 and the swing arm 51 through bolts and nuts, so that the metal clamping plate is convenient to replace. In other embodiments, the metal clamping plate 57 can be welded to the U-shaped frame 53 and the swing arm 51.

In this embodiment, the turntable 1 is coaxially sleeved on the turntable rotating shaft, and the turntable 1 can rotate around the turntable rotating shaft. Carousel pivot is worn to locate carousel 1, and level pressure roller 2 is connected in the carousel pivot, can set up level pressure roller 2 to cyclic annular, cup joints with the pivot of carousel 1, realizes dismantling the connection, is convenient for change different level pressure roller 2. In other embodiments, the fixed pressure roller 2 is internally provided with internal threads, the rotating shaft of the rotating disc is provided with external threads, and the fixed pressure roller 2 and the rotating shaft of the rotating disc are detachably connected through screw threads.

At present, when a roller bending test is performed on welding samples 10 with different widths, the interval between the dynamic pressure roller 3 and the fixed pressure roller 2 needs to be adjusted according to the width of the welding sample 10, the dynamic pressure roller 3 with different sizes is usually replaced to achieve the purpose, the operation is complex, the time is long, the practicability is low, the dynamic pressure rollers 3 with different sizes need to be prepared, and the test cost is improved. Preferably, the bending test device of welding sample still includes adjusting part 4, adjusting part 4 includes connecting rod 41 and connecting seat 42, connecting seat 42 is fixed on carousel 1, the one end of connecting rod 41 is connected in dynamic pressure roller 3, and connecting rod 41 wears to establish connecting seat 42 and can follow self axis and remove for connecting seat 42, can adjust the interval size between dynamic pressure roller 3 and the constant pressure roller 2, make testing device be applicable to multiple width size's welding sample 10, and easy operation, operating time has been shortened, the practicality has been improved, testing device's application scope has been enlarged, need not prepare not unidimensional dynamic pressure roller 3 and realize changing the interval between dynamic pressure roller 3 and the constant pressure roller 2, and the test cost is reduced.

Specifically, be equipped with the external screw thread on the lateral wall of connecting rod 41, set up threaded hole on the connecting seat 42, connecting rod 41 and threaded hole spiro union adopt threaded connection to realize that connecting rod 41 removes relative connecting seat 42, have further simplified operation process, have saved operating time, have improved the practicality.

Preferably, connecting seat 42 and connecting rod 41 are the metal material, have improved structural strength and incorruptibility to can dismantle connecting seat 42 on carousel 1 through bolt and nut, be convenient for change. In the present embodiment, the end of the connecting rod 41 remote from the movable pressure roller 3 is provided with a turning handle 411 for facilitating the operation of turning the connecting rod 41. Specifically, a connecting disc is further arranged between the rotating handle 411 and the connecting rod 41, the connecting disc is coaxial with the connecting rod 41, the outer diameter of the connecting disc is larger than that of the connecting rod 41, and the rotating handle 411 is arranged on the edge of the connecting disc, so that the connecting rod 41 can be rotated more labor-saving.

Preferably, a connecting block 412 is fixed to an end of the connecting rod 41 facing the movable pressure roller 3, and the connecting block 412 is detachably connected to the movable pressure roller 3. The movable roller 3 is detachably connected with the connecting rod 41 through the connecting block 412, the movable roller 3 with different sizes can be replaced conveniently, the width of the welding sample 10 suitable for the test device is further enlarged, and the application range is enlarged. The connecting block 412 is provided with a mounting column, the dynamic pressure roller 3 is annular, and the mounting column penetrates through the dynamic pressure roller 3 to realize detachable connection. The connecting block 412 is a pentagonal metal block and is welded to the connecting rod 41. In other embodiments, the interior of the movable pressure roller 3 is provided with an internal thread, the mounting column is provided with an external thread, and the movable pressure roller 3 and the mounting column are detachably connected through a screw joint.

Preferably, the gripping assembly 5 further comprises a drive motor. The driving motor and the turntable 1 are arranged at intervals, an output rotating shaft 52 of the driving motor is connected to the other end of the swing arm 51, namely, the end far away from the U-shaped frame 53, and the output rotating shaft 52 is arranged in parallel with the axis of the fixed pressure roller 2. Set up swing arm 51 and be connected with output pivot 52, can make swing arm 51 drive welding sample 10 rotate and with decide compression roller 2 contact and tangent, improved test device's degree of automation, improved practicality and convenience in use. The swing arm 51 is a rod-like member having a rectangular cross section, is vertically connected to the output shaft 52, and is fixed by bolting or welding.

Preferably, the bending test apparatus for the welding sample further includes a scale 8. The scale 8 can slide in the extending direction of the swing arm 51 to measure the distance between the midpoint of the weld 101 on the welding specimen 10 and the tangent point of the welding specimen 10 and the stationary pressing roll 2. In the existing test requirements, the welding sample 10 is strip-shaped, the welding sample 10 is clamped on the side wall of the swing arm 51 before the test, the welding sample 10 needs to be bent into a U shape in the test process, two straight edges of the U shape are parallel, an arc edge of the U shape is in a semicircular shape and is attached to the outer wall of the pressure roller 2, a midpoint of the welding seam 101 theoretically needs to be located at a midpoint of the arc edge on the U shape, that is, a distance between the midpoint of the welding seam 101 on the welding sample 10 and a tangent point of the welding sample 10 and the pressure roller 2 is 1/4 pi D, wherein D is the outer diameter of the pressure roller 2, and the actual value range of the distance is 0.7-0.9D. The graduated scale 8 is arranged to facilitate the measurement of the distance value. Specifically, the swing arm 51 is provided with a slide way, the slide way extends along the length direction of the swing arm 51, namely the slide way is parallel to the welding sample 10 until the slide way is communicated with the end part of the swing arm 51, so that the graduated scale 8 can slide along the slide way and protrude out of the swing arm 51 to measure the welding sample 10 before testing. The graduated scale 8 is a steel scale, and scales are arranged on the graduated scale 8, so that the distance from the middle point of the welding seam 101 to the tangent point of the welding sample 10 and the fixed compression roller 2 can be conveniently measured.

Further, the clamping assembly 5 further comprises a positioning column 55, the swing arm 51 is provided with a positioning hole 511, one end of the positioning column 55 is arranged in the positioning hole 511, the other end of the positioning column 55 penetrates through the U-shaped frame 53, the positioning column 55 is arranged, the U-shaped frame 53 is prevented from sliding along the swing arm 51, the position of the U-shaped frame 53 on the swing arm 51 is fixed, the clamping of the welding sample 10 is ensured to be firm, the sliding of the welding sample 10 in the bending test process is avoided, and the accuracy of an experimental result is improved.

Furthermore, the swing arm 51 is provided with a plurality of positioning holes 511 at equal intervals along the length direction thereof, and the positioning column 55 can be selectively placed in one of the positioning holes 511. The plurality of positioning holes 511 are arranged, so that the U-shaped frame 53 can be conveniently changed in position on the swing arm 51 according to the welding samples 10 with different lengths, the clamping assembly 5 can clamp the welding samples 10 with different lengths, the clamping position on the same welding sample 10 can be adjusted, the application range is enlarged, and the practicability is improved. In the present embodiment, two positioning pillars 55 are provided, and two positioning pillars 55 can be selectively placed in one set of two adjacent positioning holes 511. Furthermore, the positioning column 55 is a bolt, the positioning hole 511 is a screw hole, and a stud of the positioning column 55 is screwed into the positioning hole 511. The screw head of the positioning column 55 protrudes from the U-shaped frame 53.

Preferably, the swing arm 51 is provided with a T-shaped groove 512 arranged along the length direction of the swing arm 51, the end of the piston rod 541 of the hydraulic cylinder 54 is T-shaped and is arranged inside the T-shaped groove 512, and when the U-shaped frame 53 moves along the swing arm 51, the piston rod 541 can slide along the T-shaped groove 512.

Preferably, the U-shaped frame 53 further includes a connecting plate 533 connected between the first straight arm 531 and the second straight arm 532, the connecting plate 533 is provided with a waist-shaped hole 5331, the positioning column 55 is disposed through the waist-shaped hole 5331, and the positioning column 55 can relatively slide along the waist-shaped hole 5331 to change a distance between the first straight arm 531 and the swing arm 51, so that the clamping assembly 5 can be applied to welding samples 10 with different widths, and the application range is expanded. The positioning post 55 is a bolt, and a screw head thereof is attached to one side of the connecting plate 533 opposite to the swing arm 51 and clamped to two sides of the waist-shaped hole 5331. The connecting plate 533 is attached to the side surface of the swing arm 51, so that the welding sample 10 is firmly clamped.

Specifically, the using method of the testing device provided in this embodiment is as follows:

firstly, the size of the pressure-fixing roller 2 and the size of the U-shaped frame 53 are selected according to the material and size of the welding sample 10, the U-shaped frame 53 is fixed at the proper positioning hole 511, and the hydraulic cylinder 54 is started to pre-clamp the welding sample 10. Next, the driving motor is started, and the swing arm 51 is rotated so that the welding sample 10 is brought into contact and tangent with the fixed pressure roller 2. Then, the pressure of the piston rod 541 of the hydraulic cylinder 54 on the swing arm 51 is slightly reduced, the scale 8 is slid out, the distance from the midpoint of the weld bead 101 of the welding specimen 10 to the tangent point between the welding specimen 10 and the fixed pressure roller 2 is adjusted, the scale 8 is retracted, the pressure of the piston rod 541 of the hydraulic cylinder 54 on the swing arm 51 is increased again, and the welding specimen 10 is clamped. Then, the connecting rod 41 is rotated by rotating the handle 411, the distance between the dynamic pressure roller 3 and the welding sample 10 is adjusted, the connecting line between the axis of the dynamic pressure roller 3 and the axis of the fixed pressure roller 2 is perpendicular to the welding sample 10, and the distance between the dynamic pressure roller 3 and the welding sample 10 is 1.5 mm. Subsequently, the turntable 1 is rotated to bring the moving press roller 3 into contact and contact with the welding sample 10, and this is recorded as the initial angle of the welding sample 10. And finally, driving the dynamic pressure roller 3 to rotate by a preset angle by the turntable 1 according to test requirements, bending the welding sample 10, relieving the pressure by the hydraulic cylinder 54, and taking out the welding sample 10.

In this embodiment, the testing device further comprises a turntable motor and a controller, wherein the turntable motor can drive the turntable 1 to rotate, and the controller can control the turntable motor and the driving motor to rotate.

Preferably, the bending test device of the welding sample further comprises a first stopper 6. The first limiting member 6 is used for limiting the rotation angle of the turntable 1. Specifically, this test device arranges in on operation platform, and first locating part 6 can be limit switch, fixes on operation platform, and first locating part 6 is provided with two along the circumferencial direction interval of carousel 1, and when turning handle 411 and two first locating parts 6 contact, the controller can control the carousel motor and close, and the turned angle of restriction carousel 1 avoids turning handle 411 and swing arm 51 to collide with each other.

Preferably, the bending test device for the welding sample further comprises a second limiting part 7, wherein the second limiting part 7 is used for limiting the rotating angle of the swing arm 51, the rotating angle of the swing arm 51 is prevented from being too large, a tester is prevented from being accidentally injured, and the safety is improved. Specifically, the second limiting members 7 may be limit switches fixed on the operating platform, the two second limiting members 7 are disposed on two sides of the swing arm 51, and when the two sides of the swing arm 51 contact the two second limiting members 7, the controller can control the driving motor to be turned off to limit the rotation angle of the swing arm 51.

In fig. 1, the range in which the turntable 1 can be rotated and the range in which the swing arm 51 can be swung are shown by chain lines.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A bending test device for a welding sample is characterized by comprising:

the rotary table (1) can rotate around the axis of the rotary table;

the fixed compression roller (2) is coaxially arranged at the circle center of the turntable (1);

the dynamic pressure roller (3) is parallel to the fixed pressure roller (2) and arranged at the same side of the turntable (1) at intervals;

the clamping assembly (5) comprises a swing arm (51), a U-shaped frame (53) and a hydraulic cylinder (54), the U-shaped frame (53) is arranged at one end of the swing arm (51) and comprises a first straight arm (531) and a second straight arm (532) which are oppositely arranged, the first straight arm (531) and the second straight arm (532) are respectively arranged at two sides of the swing arm (51), a cylinder body (542) of the hydraulic cylinder (54) is fixed on the second straight arm (532), and a piston rod (541) of the hydraulic cylinder (54) penetrates through the second straight arm (532) and abuts against the swing arm (51);

one end of the welding sample (10) can be arranged between the first straight arm (531) and the swing arm (51), and the other end of the welding sample (10) can penetrate through the interval between the pressure roller (2) and the dynamic pressure roller (3) and is tangent to the pressure roller (2).

2. The bending test device of the welding sample according to claim 1, further comprising an adjusting component (4), wherein the adjusting component (4) comprises a connecting rod (41) and a connecting seat (42), the connecting seat (42) is fixed on the turntable (1), one end of the connecting rod (41) is connected to the dynamic pressure roller (3), and the connecting rod (41) penetrates through the connecting seat (42) and can move along its own axis relative to the connecting seat (42).

3. The bending test device of the welding sample according to claim 2, wherein the connecting rod (41) is provided with an external thread on the side wall, the connecting seat (42) is provided with a threaded hole, and the connecting rod (41) is in threaded connection with the threaded hole.

4. The bending test device of a welding coupon according to claim 2, characterized in that a connecting block (412) is fixed to an end of the connecting rod (41) facing the movable pressure roller (3), the connecting block (412) being detachably connected to the movable pressure roller (3).

5. The bending test device of the welding sample according to claim 1, characterized in that the clamping assembly (5) further comprises a driving motor, the driving motor is arranged at a distance from the turntable (1), an output rotating shaft (52) of the driving motor is connected to the other end of the swing arm (51), and the output rotating shaft (52) is arranged in parallel with the axis of the fixed pressure roller (2).

6. The bending test device of the welding sample according to claim 1, wherein the clamping assembly (5) further comprises a positioning column (55), the swing arm (51) is provided with a positioning hole (511), one end of the positioning column (55) is arranged in the positioning hole (511), and the other end of the positioning column penetrates through the U-shaped frame (53).

7. The bending test device for the welding sample according to claim 6, wherein the swing arm (51) is provided with a plurality of positioning holes (511) at equal intervals along the length direction, and the positioning column (55) can be selectively placed in one of the positioning holes (511).

8. The bending test device of the welding sample according to claim 6, wherein the U-shaped frame (53) further comprises a connecting plate (533) connected between the first straight arm (531) and the second straight arm (532), the connecting plate (533) is provided with a waist-shaped hole (5331), the positioning column (55) is arranged in the waist-shaped hole (5331) in a penetrating manner, and the positioning column (55) can slide along the waist-shaped hole (5331) to change the distance between the first straight arm (531) and the swing arm (51).

9. The bending test device of the welding sample according to claim 5, further comprising a first limiting member (6) and a second limiting member (7), wherein the first limiting member (6) is used for limiting the rotation angle of the turntable (1), and the second limiting member (7) is used for limiting the rotation angle of the swing arm (51).

10. The bending test device of a welding specimen according to claim 1, characterized in that the bending test device of a welding specimen further comprises a scale (8), the scale (8) being slidable in the extending direction of the swing arm (51) to measure the distance between the midpoint of the weld seam (101) on the welding specimen (10) and the tangent point of the welding specimen (10) and the constant pressure roller (2).

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