Equipment for detecting bending resistance of thin-wall seamless tube

Abstract

The utility model discloses equipment for detecting the bending resistance of a thin-wall seamless pipe, which belongs to the technical field of pipe bending resistance detection equipment and comprises a base, a portal frame arranged on the base, a hydraulic cylinder mounted on the portal frame, a bending head connected with an output shaft of the hydraulic cylinder and a bending resistance detection frame. A guide rod sleeved with a reverse thrust spring is fixedly connected to the installation base, a movable frame is slidably arranged on the guide rod in a sleeved mode, and a pipe clamp used for clamping a pipe fitting is arranged on the movable frame. According to the technical key points, the magnitude of thrust applied by the reverse thrust spring at the moment, namely the magnitude of bending moment borne by the pipe fitting, can be directly judged through the position of the movable frame, so that the magnitude of force applied to the pipe fitting can be unified in a manner of unifying the sliding distance of the movable frame without the help of a force sensor and a matched system, and variable control is realized; and finally, the bending resistance can be compared by comparing the deformation degree.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending resistance detection equipment, and particularly relates to a thin-walled seamless pipe bending resistance performance detection equipment. Background Art

[0002] A seamless pipe is a long steel bar with a hollow cross-section and no seams around. The seamless pipe is formed by piercing a whole round steel, and there is no welding trace on the surface. According to the manufacturing method, seamless pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless pipes, cold-drawn seamless pipes, extruded seamless pipes, etc. According to the cross-sectional shape, seamless pipes can be divided into circular seamless pipes and special-shaped seamless pipes, and the special-shaped seamless pipes include various complex shapes such as square, oval, triangular, hexagonal, etc. According to the application field, seamless pipes can be further divided into thick-walled seamless steel pipes and thin-walled seamless pipes. The bending resistance performance of pipe fittings is an important index, and it is usually necessary to detect its bending resistance performance during production.

[0003] For the existing seamless pipe bending resistance detection equipment, it usually uses hydraulic equipment to apply pressure to the pipe fittings to make them bend and deform, so as to detect their bending resistance performance. However, if it is necessary to compare the bending resistance performance of pipe fittings, it is necessary to conduct comparative detection in a way of controlling variables, that is, restricting the same pressure to compare the deformation degree, or restricting the same deformation degree to compare the pressure. No matter which method is adopted, it requires a relatively precise force sensor and a supporting control system, resulting in a relatively high use cost. Therefore, in view of the above problems, a thin-walled seamless pipe bending resistance performance detection equipment is proposed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a thin-walled seamless pipe bending resistance performance detection equipment. The pipe bending resistance detection equipment applies pressure to the middle part of the pipe fitting through a hydraulic cylinder. Since both sides of the pipe fitting are placed on the movable frames, its two ends will apply a downward pressure to the movable frames and push them to slide down, while compressing the anti-push springs. In the above situation, the anti-push springs apply an upward thrust to the ends of the pipe fitting through the movable frames to make it bend and deform. Moreover, the position of each movable frame corresponds to an anti-push spring with a different compression degree, and each anti-push spring with a different compression degree corresponds to an upward thrust, that is, the magnitude of the thrust applied by the anti-push spring at this time can be judged through the position of the movable frame. In this way, without relying on a force sensor and a supporting system, by unifying the sliding distance of the movable frame, the magnitude of the force applied to the pipe fitting can be unified, so as to control variables, and finally compare the deformation degree to compare its bending resistance performance, solving the technical problem that in the prior art, the bending resistance detection equipment usually needs to rely on a relatively precise force sensor and its supporting control system to realize the bending resistance performance detection of pipe fittings in a way of controlling variables, resulting in a relatively high use cost.

[0005] The technical solution adopted by the embodiments of the present application to solve its technical problems is:

[0006] A bending resistance detection device for thin-walled seamless pipes, including a base, on which a gantry is provided. A hydraulic cylinder is installed on the gantry, and the output shaft of the hydraulic cylinder is connected to a pressing elbow. A bending resistance detection frame is arranged inside the gantry for erecting the pipe to be detected, and a stroke limiting mechanism. Among them, the bending resistance detection frame includes a mounting seat, on which a guide rod externally sleeved with a return spring is fixedly connected. A movable frame is slidably sleeved on the guide rod, and a pipe clamp for clamping the pipe is arranged on the movable frame. The stroke limiting mechanism is used to limit the movement range of the movable frame.

[0007] Through the above structural form, the pipe bending resistance detection device presses on the middle part of the pipe through the hydraulic cylinder. Since both sides of the pipe are placed on the movable frame, downward pressure will be exerted on the movable frame at both ends and it will be pushed downwards, while compressing the return spring. In the above situation, the return spring exerts an upward thrust on the end of the pipe through the movable frame to make it bend and deform. And the position of each movable frame corresponds to a return spring with a different compression degree, and each return spring with a different compression degree corresponds to an upward thrust. That is, the magnitude of the thrust exerted by the return spring can be judged by the position of the movable frame. In this way, without relying on a force sensor and its supporting system, by unifying the sliding distance of the movable frame, the magnitude of the force applied to the pipe can be unified, so as to control variables, and finally compare the deformation degree to compare its bending resistance.

[0008] In a possible implementation manner, the stroke limiting mechanism includes an adjustment frame fixedly connected to the gantry, and a movable elastic piece fixedly connected to the movable frame. Among them, scale lines are drawn on the inner wall of the adjustment frame, and a threaded rod is arranged in the adjustment frame, and a static elastic piece is slidably sleeved on the threaded rod.

[0009] Through the above structural form, it can assist the user to limit the movement distance of the movable frame, that is, to control the magnitude of the force applied to the pipe. That is, slide the static elastic piece to the specified position with reference to the scale line. When the hydraulic cylinder works to press the pipe, the pipe will push the movable frame downwards, and the movable elastic piece on it will move accordingly. When the movable elastic piece contacts the static elastic piece, immediately stop the work of the hydraulic cylinder to ensure that the magnitude of the force received by each batch of pipes to be detected is the same.

[0010] In a possible implementation manner, two locking rings are threadedly connected to the threaded rod, one locking ring is located above the static elastic piece, and the other locking ring is located below the static elastic piece.

[0011] Through the above structural form, the position of the static elastic piece can be fixed through the extrusion action between the locking rings.

[0012] In a possible implementation manner, an electromagnetic relay is arranged in the working circuit of the hydraulic cylinder. Contact pieces are arranged on both the movable elastic piece and the static elastic piece, and the two contact pieces are connected in series in the working circuit of the electromagnetic relay. The separation and combination of the two contact pieces control the on and off of the electromagnetic relay.

[0013] With the above structural form, when the two contact pieces are not in contact, the electromagnetic relay is in the closed state. At this time, the hydraulic cylinder is in the working state. When the moving contact piece moves to make the two contact pieces contact, the electromagnetic relay is in the open state. At this time, the hydraulic cylinder immediately stops working. This method can avoid the errors generated when manually stopping the hydraulic cylinder, making the detection results more accurate.

[0014] In a possible implementation, the pipe clamp includes a bridging plate, on which two annular elastic clamping pieces are fixedly arranged, and a flexible anti-slip rubber layer is attached to the inner wall of the elastic clamping pieces.

[0015] With the above structural form, the elastic clamping pieces can clamp the pipe placed therein by deformation, preventing it from rolling during pressurization and making the detection work unable to continue. At the same time, the anti-slip rubber layer can increase the friction between the elastic clamping pieces and the pipe, further preventing it from rolling laterally under pressure.

[0016] In a possible implementation, two symmetrically arranged installation slots are provided on the upper end surface of the movable frame, and two protrusions corresponding to the installation slots are fixedly arranged on the lower end surface of the bridging plate.

[0017] With the above structural form, a detachable connection between the entire pipe clamp and the movable frame can be achieved, facilitating the user to select a suitable pipe clamp for clamping according to the size and shape of the pipe.

[0018] In a possible implementation, the movable frames are connected into one body by horizontal connecting rods arranged on both sides, and the horizontal connecting rods are connected to the movable frames by bolts.

[0019] With the above structural form, the horizontal connecting rods can connect the movable frames on both sides into a whole, ensuring that they can move synchronously and avoiding large errors in the results caused by different moving distances of the movable frames on both sides.

[0020] In a possible implementation, the pressing elbow includes a connecting shaft connected to the output shaft of the hydraulic cylinder, a pressing block is fixedly connected to the lower end of the connecting shaft, and a rubber pad with a curved bottom end is provided at the lower end of the pressing block.

[0021] With the above structural form, the pressing block can increase the force-bearing area in the middle of the pipe, avoiding the pipe being directly broken due to stress concentration at the pressurized part.

[0022] In summary, the utility model has the following beneficial technical effects:

[0023] The pipe bending resistance detection device applies pressure to the middle of the pipe fitting through a hydraulic cylinder. Since both sides of the pipe fitting are placed on the movable frames, downward pressure will be applied to the movable frames at both ends, causing them to slide downward. At the same time, the anti-push springs are compressed. In the above situation, the anti-push springs apply an upward thrust to the ends of the pipe fitting through the movable frames, causing it to bend and deform. Each position of the movable frame corresponds to an anti-push spring with a different compression degree, and each anti-push spring with a different compression degree corresponds to an upward thrust. That is, the magnitude of the thrust applied by the anti-push spring at this time can be judged by the position of the movable frame. In this way, without relying on a force sensor and its supporting system, the magnitude of the force applied to the pipe fitting can be unified by unifying the sliding distance of the movable frame, so as to control variables, and finally compare the deformation degree to compare its bending resistance performance. Description of the Drawings

[0024] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a schematic diagram of the structure of the bending resistance detection frame of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the stroke limiting mechanism of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of the pipe clamp of the present invention;

[0029] Figure 5 is a schematic diagram of the control principle of the stroke limiting mechanism of the present invention.

[0030] In the figure: 1, base; 11, gantry; 2, hydraulic cylinder; 3, bending resistance detection frame; 31, mounting seat; 32, guide rod; 33, movable frame; 331, mounting slot; 34, pipe clamp; 341, bridging plate; 342, elastic clip; 343, anti-slip rubber layer; 35, anti-push spring; 36, cross link; 4, stroke limiting mechanism; 41, adjusting frame; 42, movable sheet; 43, threaded rod; 44, locking ring; 45, static elastic sheet; 46, contact sheet; 5, pressing elbow; 51, connecting shaft; 52, pressing block. Detailed Embodiment

[0031] The technical solutions in the embodiments of the present application are to solve the problems in the above background technology, and the general idea is as follows:

[0032] As Figure 1 - Figure 2As shown in the figure, a bending resistance detection device for thin-walled seamless pipes provided in this embodiment includes a base 1, on which a gantry 11 is provided. A hydraulic cylinder 2 is installed on the gantry 11, and the output shaft of the hydraulic cylinder 2 is connected to a pressing elbow 5. A bending resistance detection frame 3 is arranged inside the gantry 11 for erecting the pipe to be detected. The bending resistance detection frame 3 includes a mounting seat 31. A guide rod 32 with a counter-pushing spring 35 sleeved outside is fixedly connected to the mounting seat 31. A movable frame 33 is slidably sleeved on the guide rod 32. A pipe clamp 34 for clamping the pipe is arranged on the movable frame 33. Through the above structural form, the pipe bending resistance detection device presses on the middle of the pipe through the hydraulic cylinder 2. Since both sides of the pipe are placed on the movable frame 33, downward pressure will be exerted on the movable frame 33 at both ends and it will be pushed downward, while compressing the counter-pushing spring 35.

[0033] In the above situation, the counter-pushing spring 35 exerts an upward thrust on the end of the pipe through the movable frame 33 to make it bend and deform. And the position of each movable frame 33 corresponds to a counter-pushing spring 35 with a different compression degree, and each counter-pushing spring 35 with a different compression degree corresponds to an upward thrust. That is, the magnitude of the thrust exerted by the counter-pushing spring 35 at this time can be judged by the position of the movable frame 33. In this way, without relying on a force sensor and its supporting system, by unifying the sliding distance of the movable frame 33, the magnitude of the force applied to the pipe can be unified, so as to control variables, and finally compare the deformation degree to compare its bending resistance performance.

[0034] In order to more quantitatively define the movement range of the movable frame 33, a stroke limiting mechanism 4 is also provided, as Figure 3 shown. The stroke limiting mechanism 4 includes an adjustment frame 41 fixedly connected to the gantry 11, and a movable piece 42 fixedly connected to the movable frame 33. Among them, scale lines are drawn on the inner wall of the adjustment frame 41, and a threaded rod 43 is arranged in the adjustment frame 41. A static elastic piece 45 is slidably sleeved on the threaded rod 43. Through the above structural form, it can assist the user to limit the movement distance of the movable frame 33, that is, control the magnitude of the force applied to the pipe. That is, slide the static elastic piece 45 to the specified position with reference to the scale line. When the hydraulic cylinder 2 works to press the pipe, the pipe will push the movable frame 33 downward, and the movable piece 42 on it will move accordingly. When the movable piece 42 contacts the static elastic piece 45, the work of the hydraulic cylinder 2 will be stopped immediately to ensure that the magnitude of the force received by the pipes to be detected in each batch is the same.

[0035] Among them, two locking rings 44 are threadedly connected to the threaded rod 43. One locking ring 44 is located above the static elastic piece 45, and the other locking ring 44 is located below the static elastic piece 45. Through the above structural form, the position of the static elastic piece 45 can be fixed by the squeezing action between the locking rings 44.

[0036] In order to more precisely define the movement range of the movable frame 33, as Figure 5As shown, an electromagnetic relay is provided in the working circuit of the hydraulic cylinder 2, and a contact piece 46 is provided on both the movable spring piece 42 and the static spring piece 45, and the two contact pieces 46 are connected in series in the working circuit of the electromagnetic relay, and the clutch of the two contact pieces 46 controls the on and off of the electromagnetic relay. Through the above-mentioned structural form, when the two contact pieces 46 are not in contact, the electromagnetic relay is in the on state, at this time, the hydraulic cylinder 2 is in the working state, when the movable spring piece 42 moves to make the two contact pieces 46 contact, the electromagnetic relay is in the off state, at this time, the hydraulic cylinder 2 stops working immediately, this method can avoid the error caused by manually stopping the hydraulic cylinder 2, so that the detection result is more accurate.

[0037] like Figure 4 As shown, the pipe clamp 34 includes a strap 341, on which two annular elastic clips 342 are fixedly arranged, and the inner wall of the elastic clip 342 is affixed with a flexible anti-skid rubber layer 343. Through the above-mentioned structural form, the elastic clip 342 can clamp the pipe placed therein by deformation, so as to prevent it from rolling when pressure is applied and making it impossible to continue the detection work. At the same time, the anti-skid rubber layer 343 can increase the friction between the elastic clip 342 and the pipe, and further prevent it from rolling sideways when pressure is applied.

[0038] In addition, two symmetrically arranged mounting slots 331 are provided on the upper end surface of the movable frame 33, and two protrusions corresponding to the mounting slots 331 are fixedly provided on the lower end surface of the strap 341. Through the above-mentioned structural form, a detachable connection between the pipe clamp 34 as a whole and the movable frame 33 can be achieved, which is convenient for the user to select a suitable pipe clamp 34 for clamping according to the size and shape of the pipe.

[0039] like Figure 2 As shown, the movable frames 33 are connected as a whole through the transverse connecting rods 36 arranged on both sides, and the transverse connecting rods 36 and the movable frames 33 are connected by bolts. Through the above-mentioned structural form, the movable frames 33 on both sides can be connected as a whole through the transverse connecting rods 36 to ensure that they can move synchronously and avoid large errors in the results caused by different movement distances of the movable frames 33 on both sides.

[0040] like Figure 2 As shown, the bending head 5 includes a connecting shaft 51 connected to the output shaft of the hydraulic cylinder 2, and a pressure block 52 is fixedly connected to the lower end of the connecting shaft 51. The lower end of the pressure block 52 is provided with a rubber pad with a curved bottom end. Through the above-mentioned structural form, the pressure block 52 can increase the force-bearing area of ​​the middle part of the pipe fitting, thereby preventing the pipe fitting from being directly broken due to stress concentration at the pressure point.

[0041] The use principle and use process of this utility model:

[0042] The pipe bending resistance testing device applies pressure to the middle of the pipe through the hydraulic cylinder 2. Since both sides of the pipe are placed on the movable frame 33, downward pressure will be exerted on the two ends of the pipe, which will push the movable frame 33 downward and compress the anti-push spring 35 at the same time. In the above situation, the anti-push spring 35 applies an upward thrust to the end of the pipe through the movable frame 33, causing it to bend and deform. Moreover, the position of each movable frame 33 corresponds to an anti-push spring 35 with a different compression degree, and each anti-push spring 35 with a different compression degree corresponds to an upward thrust. That is, the magnitude of the thrust exerted by the anti-push spring 35 at this time can be judged by the position of the movable frame 33. In this way, without relying on a force sensor and its supporting system, the magnitude of the force applied to the pipe can be unified by unifying the sliding distance of the movable frame 33, so as to control variables, and finally the bending resistance performance can be compared by comparing the deformation degree.

[0043] In order to control the sliding distance of the movable frame 33, the user can slide the static elastic piece 45 to the designated position with reference to the scale line. When the hydraulic cylinder 2 works to apply pressure to the pipe, the pipe will push the movable frame 33 downward, and the movable elastic piece 42 on it will move accordingly. When the movable elastic piece 42 contacts the static elastic piece 45, the work of the hydraulic cylinder 2 will be stopped immediately to ensure that the magnitude of the force received by the pipes to be tested in each batch is the same.

[0044] In order to more accurately limit the movement range of the movable frame 33, an electromagnetic relay is provided in the working circuit of the hydraulic cylinder 2. Contact pieces 46 are provided on both the movable elastic piece 42 and the static elastic piece 45, and the two contact pieces 46 are connected in series in the working circuit of the electromagnetic relay. The separation and combination of the two contact pieces 46 control the on and off of the electromagnetic relay. Through the above structural form, when the two contact pieces 46 are not in contact, the electromagnetic relay is in the on state. At this time, the hydraulic cylinder 2 is in the working state. When the movable elastic piece 42 moves so that the two contact pieces 46 are in contact, the electromagnetic relay is in the off state, and at this time the hydraulic cylinder 2 stops working immediately. This method can avoid the errors generated when manually stopping the hydraulic cylinder 2 by hand, making the test results more accurate.

[0045] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A bending resistance detection device for thin-walled seamless pipes, characterized in that, Comprising: A base (1) provided with a gantry (11) thereon, a hydraulic cylinder (2) is installed on the gantry (11), and the output shaft of the hydraulic cylinder (2) is connected to a press elbow (5); A bending resistance detection frame (3) which is arranged inside the gantry (11) for erecting a pipe to be detected; A stroke limiting mechanism (4); Among them, the bending resistance detection frame (3) includes a mounting seat (31), a guide rod (32) with a counter-pushing spring (35) sleeved outside is fixedly connected to the mounting seat (31), a movable frame (33) is slidably sleeved on the guide rod (32), and a pipe clamp (34) for clamping the pipe is arranged on the movable frame (33), and the stroke limiting mechanism (4) is used to limit the movement range of the movable frame (33).

2. The bending resistance detection device for a thin-walled seamless pipe according to claim 1, wherein: The stroke limiting mechanism (4) includes an adjustment frame (41) fixedly connected to the gantry (11), and a movable piece (42) fixedly connected to the movable frame (33). Among them, scale lines are drawn on the inner wall of the adjustment frame (41), and a threaded rod (43) is arranged in the adjustment frame (41), and a static elastic piece (45) is slidably sleeved on the threaded rod (43).

3. The bending resistance detection device for a thin-walled seamless pipe according to claim 2, wherein: Two locking rings (44) are threadedly connected to the threaded rod (43), one locking ring (44) is located above the static elastic piece (45), and the other locking ring (44) is located below the static elastic piece (45).

4. The flexural performance testing device for a thin-walled seamless pipe according to claim 2, characterized in that: An electromagnetic relay is arranged in the working circuit of the hydraulic cylinder (2). Contact pieces (46) are arranged on both the movable piece (42) and the static elastic piece (45), and the two contact pieces (46) are connected in series in the working circuit of the electromagnetic relay. The separation and combination of the two contact pieces (46) control the on and off of the electromagnetic relay.

5. The bending resistance detection device for a thin-walled seamless pipe according to claim 1, characterized in that: The pipe clamp (34) includes a supporting plate (341), two annular elastic clamping pieces (342) are fixedly arranged on the supporting plate (341), and a flexible anti-slip rubber layer (343) is attached to the inner wall of the elastic clamping piece (342).

6. The bending resistance detection device for a thin-walled seamless pipe according to claim 5, characterized in that: Two symmetrically arranged installation slots (331) are opened on the upper end surface of the movable frame (33), and two convex blocks corresponding to the installation slots (331) are fixedly arranged on the lower end surface of the supporting plate (341).

7. An anti-bending performance detection device for a thin-walled seamless pipe according to claim 1, characterized in that: The movable frames (33) are connected into one body through transverse connecting rods (36) arranged on both sides, and the transverse connecting rods (36) and the movable frames (33) are connected by bolts.

8. An anti-bending performance detection device for a thin-walled seamless pipe according to claim 1, characterized in that: The press elbow (5) includes a connecting shaft (51) connected to the output shaft of the hydraulic cylinder (2), a pressing block (52) is fixedly connected to the lower end of the connecting shaft (51), and a rubber pad with a curved bottom end is arranged at the lower end of the pressing block (52).

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