Plate bending test device

Abstract

The utility model discloses a plate bending test device, which belongs to the technical field of mechanical property bending tests, and comprises a support plate, a support block, a bending pressure head, a pressing piece, a locking piece and a bending pressure plate, the support block is clamped on the support plate, and the bending pressure head is clamped on the support block; the pressing piece is used for being matched with the supporting plate to press and limit the first end of the bending sample on the supporting plate, the locking piece is used for pressing and fixing the pressing piece on the supporting plate, and the bending pressing plate is used for being connected with a lifting mechanism of the universal testing machine and is driven by the lifting mechanism to press and bend the second end of the bending sample; the bending pressure head is further used for abutting against the bending part of the bending sample and limiting the bending sample in the bending process. According to the bending device, the 180-degree bending test of a plate can be efficiently achieved, modular installation of the supporting block and the bending pressure head is achieved through the clamping type structure, the bending pressure head is convenient to disassemble and replace, operation is very convenient, and the test efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical property bending test, in particular, to a plate bending test device. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the application. The work of the now named inventors, to the extent the descriptions are concerned with, neither expressly nor impliedly, is considered prior art in the present application with respect to any description set forth in this section.

[0003] In the technical field of plate bending test, the plate bending test is usually carried out on a universal testing machine, a set of bending test device is arranged between the loading platform and the beam, and the test is carried out by driving the beam up and down displacement through the lead screw. The GB / T 232-2010 "Metallic materials - Bending test methods" clause 4 gives the schematic diagram of bending test of bending sample by bending pressure head 3 cooperating with vise.

[0004] For 180° bending test of plate welded joint, according to GB / T 2653-2008 "Welded joint bending test method" clause 6.4, theoretically, three-point bending method is used to adjust the distance between the rollers to carry out the test, which cannot directly bend 180°. The distance between the rollers is between the diameter of the bending pressure head plus twice the thickness of the plate to the diameter of the bending pressure head plus three times the thickness of the plate. If the distance between the rollers is adjusted too large, the test result is smaller than 180°; If the distance between the rollers is adjusted too small, the position of the bending sample contacting with the two lower rollers may be pressed into a pit, and the bending sample may be stuck in the device, which will also affect the test result.

[0005] The bending test conditions and parameters are described in NB / T 47014-2023 "Pressure equipment welding procedure qualification" clause 6.4.1.6, which proposes that different diameters of pressure head are needed for different base material categories on both sides of the weld. However, the existing test device has problems such as inconvenient disassembly and replacement of the bending pressure head, and inconvenient visual monitoring of the bending degree during the bending test. Moreover, the traditional three-point bending test is difficult to directly bend the plate 180° by adjusting the roller spacing. Therefore, we provide a new type of plate bending test device.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE INVENTION

[0007] In view of at least one of the above technical problems, the present application provides a plate bending test device, which can efficiently realize a 180° bending test of a plate, and can realize modular installation of a support block and a bending pressure head through a clamping structure, facilitate disassembly and replacement of the bending pressure head, and effectively improve the test efficiency.

[0008] According to an aspect of the present application, a plate bending test device is provided for cooperating with a universal testing machine to perform a 180° bending test on a pre-pressed bending sample, and the plate bending test device comprises a support plate, a support block, a bending pressure head, a pressing member, a locking member, and a bending pressure plate.

[0009] The support plate is configured to be fixed on a loading platform of the universal testing machine, the support block is configured to be clamped on the support plate, the bending pressure head is configured to be clamped on the support block, the pressing member is configured to press and limit a first end of the bending sample on the support plate in cooperation with the support plate, the locking member is configured to press and fix the pressing member on the support plate, the bending pressure plate is configured to be connected with a lifting mechanism of the universal testing machine and to drive the bending pressure plate to press and bend a second end of the bending sample, and the bending pressure head is further configured to abut against a bent portion of the bending sample and to limit the bending sample during the bending process.

[0010] In some embodiments of the present application, a plurality of second limiting grooves are formed in one side of the support plate along the length direction thereof, and a plurality of first connecting bosses are arranged at the bottom end of the support block, the first connecting bosses being configured to be inserted into the second limiting grooves to clamp the support block on the support plate.

[0011] In some embodiments of the present application, a limiting recess is formed between each first connecting boss at the bottom end of the support block, and each limiting recess is configured to allow the first end of a different bending sample to pass therethrough.

[0012] In some embodiments of the present application, a third limiting groove is formed in the side wall of the support block facing the bending pressure head, and a second connecting boss is arranged on the bending pressure head, the second connecting boss being configured to be inserted into the third limiting groove to clamp the bending pressure head on the support block.

[0013] In some embodiments of the present application, the bending pressure head comprises a cylindrical limiting portion, the cross section of the limiting portion is semicircular, the arc-shaped top surface of the limiting portion is configured to abut against the bent portion of the bending sample, and the second connecting boss is arranged at the bottom end of the limiting portion.

[0014] In some embodiments of the present application, the end faces of the opposite sides of the limiting portion are each provided with an angle scale line.

[0015] In some embodiments of the present application, a first limiting groove is formed on the support plate along the length direction thereof, and a plurality of locking through holes are formed on the pressing member at intervals, the locking member is used to pass through the locking through holes and cooperate with the preset connecting screw hole in the first limiting groove, so as to lock and position the pressing member on the support plate and press and position the first end of the bending sample.

[0016] In some embodiments of the present application, the locking member comprises a locking screw, the first end of the locking screw is used to threadedly cooperate with the preset connecting screw hole in the first limiting groove, and the second end of the locking screw is connected with a nut, the nut is used to press and position the pressing member.

[0017] In some embodiments of the present application, a detachable connecting ring is arranged on the top of the bending pressing plate, and the connecting ring is used to connect with the lifting mechanism of the universal testing machine.

[0018] In some embodiments of the present application, the bottom surface of the bending pressing plate is an inclined surface which is inclined upward toward the bending part of the bending sample.

[0019] The present application has the following beneficial effects:

[0020] The plate bending test device of the present application is used in cooperation with the universal testing machine to perform 180° bending test on the bending sample after pre-pressing, wherein the support plate is used to connect with the loading platform of the universal testing machine, the bending pressing plate is used to connect with the lifting mechanism of the universal testing machine, the first end of the bending sample is pressed and positioned by the pressing member cooperating with the support plate, the bending pressing head is connected with the support plate by the supporting block, so that the bending pressing head abuts against and positions the bending part of the bending sample, then the second end of the bending sample is pressed and bent by the lifting mechanism driving the bending pressing plate, and the 180° bending test of the bending sample is completed. The support block and the support plate are connected by clamping, and the bending pressing head and the support block are also connected by clamping, so that the bending pressing head can be conveniently disassembled and replaced, so as to adapt to the bending test requirements of different plates, greatly reducing the labor intensity and labor amount of manually replacing the bending pressing head, and being beneficial to improving the test efficiency.

[0021] Of course, it is not necessary for any product implementing the present application to achieve all the advantages described above. In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and its description serve the purpose of explaining the present application. The accompanying drawings should not be construed as an inappropriate limitation on the present application. In the drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application;

[0024] Figure 2 is the mounting schematic diagram of the support block and the bending press head of the preferred embodiment of the present application;

[0025] Figure 3 is the schematic diagram of the bending sample being bent by 180° of the preferred embodiment of the present application;

[0026] Figure 4 is the structural schematic diagram of the support plate of the preferred embodiment of the present application;

[0027] Figure 5 is the structural schematic diagram of the support block of the preferred embodiment of the present application;

[0028] Figure 6 is the structural schematic diagram of the bending press head of the preferred embodiment of the present application;

[0029] Legend: 1, support plate; 101, first limiting groove; 102, second limiting groove; 2, support block; 201, third limiting groove; 202, first connecting boss; 3, bending press head; 301, second connecting boss; 4, pressing member; 5, locking member; 6, nut; 7, bending press plate; 8, connecting ring; 9, bending sample. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different manners as defined and covered by the following.

[0031] Figure 1 is the overall structural schematic diagram of the preferred embodiment of the present application; Figure 2 is the mounting schematic diagram of the support block and the bending press head of the preferred embodiment of the present application; Figure 3 is the schematic diagram of the bending sample being bent by 180° of the preferred embodiment of the present application; Figure 4 is the structural schematic diagram of the support plate of the preferred embodiment of the present application; Figure 5 is the structural schematic diagram of the support block of the preferred embodiment of the present application; Figure 6 is the structural schematic diagram of the bending press head of the preferred embodiment of the present application.

[0032] A plate bending test device for cooperating with a universal testing machine to perform 180° bending test on a bending sample 9 which has been pre-pressed, the plate bending test device comprising a support plate 1, a support block 2, a bending press head 3, a pressing member 4, a locking member 5 and a bending press plate 7:

[0033] The support plate 1 is used for being fixed on a loading platform of a universal testing machine, the support block 2 is used for being clamped on the support plate 1, the bending pressure head 3 is used for being clamped on the support block 2, the pressing part 4 is used for cooperating with the support plate 1 to press and limit the first end of the bending sample 9 on the support plate 1, the locking part 5 is used for pressing and fixing the pressing part 4 on the support plate 1, the bending pressure plate 7 is used for being connected with a lifting mechanism of the universal testing machine and driving the bending pressure plate 7 to press and bend the second end of the bending sample 9 through the lifting mechanism, and the bending pressure head 3 is also used for abutting against the bending part of the bending sample 9 and limiting the bending sample 9 in the bending process.

[0034] Here, the meaning of the pressing part 4 refers to a structure for being pressed and fixed on the support plate 1 by the locking part 5 to press and limit the first end of the bending sample 9. In some embodiments, the pressing part 4 is a plate structure, and a plurality of locking through holes are formed on the pressing part 4 for the locking part 5 to pass through.

[0035] It should be noted that the bottom end of the support plate 1 can be provided with a step to match and fix the support plate 1 with the loading platform of the universal testing machine. The matching and fixing mode of the support plate 1 and the loading platform can be selected based on the characteristics of the loading platform of the universal testing machine, such as a step, pin shaft cooperation and the like, to ensure that the support plate 1 is in a stable and stationary state during the test.

[0036] The plate bending test device of the present application is used for cooperating with the universal testing machine to perform 180° bending test on the bending sample 9 after pre-pressing. The support plate 1 is used for being connected to the loading platform of the universal testing machine, the bending pressure plate 7 is used for being connected with the lifting mechanism of the universal testing machine, the first end of the bending sample 9 is pressed and limited by the pressing part 4 cooperating with the support plate 1, the bending pressure head 3 is connected to the support plate 1 through the support block 2, so that the bending pressure head 3 abuts against and limits the bending part of the bending sample 9, then the second end of the bending sample 9 is pressed and bent by the lifting mechanism driving the bending pressure plate 7, and the 180° bending test of the bending sample 9 is completed. The support block 2 and the support plate 1 are clamped and connected, and the bending pressure head 3 and the support block 2 are also clamped and installed, which facilitates the disassembly and replacement of the bending pressure head 3, so as to adapt to the bending test requirements of different plates, greatly reduces the labor intensity and amount of manual replacement of the bending pressure head 3, and is beneficial to improve the test efficiency.

[0037] Preferably, as shown in Figure 1 , 4 , 5, a plurality of second limiting grooves 102 are formed on one side of the support plate 1 along the length direction, and a plurality of first connecting bosses 202 are arranged at the bottom end of the support block 2, and the first connecting bosses 202 are used for being inserted into the second limiting grooves 102 to clamp the support block 2 on the support plate 1.

[0038] It can be understood that the support block 2 can be clamped on the support plate 1 through the first connecting boss 202 at the bottom end matched with the second limiting groove 102 on the support plate 1, facilitating the disassembly of the support block 2, and the second limiting groove 102 can also play a limiting role, realizing the sliding adjustment of the support block 2 along the second limiting groove 102 to position, that is, the curved pressure head 3 can be moved to abut against the bending part of the bending sample 9, greatly improving the overall operation convenience of the test device.

[0039] It should be noted that the second limiting groove 102 can adopt a dovetail groove structure, that is, the cross section of the second limiting groove 102 is an open narrow bottom wide structure, and the corresponding first connecting boss 202 also adopts a dovetail-shaped boss structure matched therewith, so that the support block 2 can be clamped on the support plate 1 by inserting the first connecting boss 202 into the second limiting groove 102 from one side of the second limiting groove 102, and the longitudinal direction of the support block 2 is limited.

[0040] Preferably, as shown in Figure 5 The bottom end of the support block 2 is provided with a limiting groove between each first connecting boss 202, and each limiting groove is used for penetrating the first end of a different bending sample 9.

[0041] It can be understood that when the support block 2 is clamped on the support plate 1 through the first connecting boss 202, the limiting groove at the bottom end of the support block 2 can have a gap between the bottom of the support block 2 and the support plate 1, and then the first end of the bending sample 9 can be pressed and limited to the support plate 1 by the pressing member 4 after penetrating the gap, which can improve the limiting stability of the bending sample 9, and the limiting groove is provided with a plurality of limiting grooves, which can facilitate the limiting of a plurality of bending samples 9 at the same time, so as to complete the bending test of a plurality of bending samples 9 at the same time.

[0042] It should be noted that the width of each limiting groove can be different, so that bending samples 9 of different widths can be penetrated.

[0043] Preferably, as shown in Figure 1 The side wall of the support block 2 facing the curved pressure head 3 is provided with a third limiting groove 201, and the curved pressure head 3 is provided with a second connecting boss 301, which is used for inserting the third limiting groove 201 to clamp the curved pressure head 3 on the support block 2.

[0044] It can be understood that when the support block 2 is clamped to the support plate 1 through the first connecting boss 202 at the bottom end, the bending pressure head 3 can be inserted into the third limiting groove 201 on the side wall of the support block 2 through the second connecting boss 301, so as to realize the clamping of the bending pressure head 3 to the support block 2, and realize the modular clamping assembly of the support plate 1, the support block 2 and the bending pressure head 3. The disassembly and replacement of the bending pressure head 3 are greatly improved, the test efficiency under a large number of test times is effectively improved, and the labor intensity of manual replacement of the bending pressure head 3 is reduced.

[0045] It should be noted that the third limiting groove 201 also adopts a dovetail groove structure, and the corresponding second connecting boss 301 also adopts a dovetail boss structure to improve the stability of clamping.

[0046] Preferably, as shown in Figure 6 The bending pressure head 3 comprises a cylindrical limiting portion, the cross section of the limiting portion is semicircular, the arc-shaped top surface of the limiting portion is used for abutting against the bent portion of the bending test sample 9, and the second connecting boss 301 is arranged at the bottom end of the limiting portion.

[0047] It can be understood that the limiting portion with a semicircular cross section can abut against the bent portion of the bending test sample 9 through the arc-shaped top surface, which not only can adapt to the abutting limiting requirements of different bending test samples 9 in a wider range, but also can reduce the bump damage to the bending test sample 9 and avoid that too sharp parts cause impact and bump to the bending test sample 9 in the bending process of the bending test sample 9.

[0048] Preferably, as shown in Figure 6 The end surfaces of the opposite sides of the limiting portion are both provided with angle scale lines.

[0049] It can be understood that in order to intuitively monitor the bending angle of the bending test sample 9 in real time and ensure the accuracy and controllability of the result, the angle scale lines are arranged on the end surfaces of the two sides of the limiting portion of the bending pressure head 3, so that the bending angle of the bending test sample 9 can be directly observed, and the use convenience and functionality of the bending test device are greatly improved.

[0050] Preferably, as shown in Figure 1 and Figure 4 The first limiting groove 101 is arranged on the support plate 1 along the length direction thereof, a plurality of locking through holes are arranged on the compression member 4 at intervals, and the locking member 5 is used to pass through the locking through hole and cooperate with the pre-set connecting screw hole in the first limiting groove 101, so as to lock and limit the compression member 4 on the support plate 1 and compress and limit the first end of the bending test sample 9.

[0051] It can be understood that by opening the locking through hole on the pressing piece 4, the pressing piece 4 can be pressed and limited on the support plate 1 by cooperating with the preset connecting screw hole on the support plate 1 after the locking piece 5 passes through the locking through hole, and then the first end of the bending sample 9 is pressed and limited, which prevents the bending sample 9 from sliding and other phenomena during the test, ensures the accuracy of the bending test and the bending angle, and also ensures the safety and stability of the test process.

[0052] It should be noted that the locking through hole is a strip-shaped through hole structure, which can conveniently adjust the position of the locking piece 5 to adjust the distance between adjacent locking pieces 5 to avoid interference with bending samples 9 of different widths.

[0053] Preferably, as shown in Figure 1 , the locking piece 5 includes a locking screw, the first end of the locking screw is used for threadedly cooperating with the preset connecting screw hole in the first limiting groove 101, and the second end of the locking screw is connected with the nut 6, and the nut 6 is used for pressing and limiting the pressing piece 4.

[0054] It can be understood that the use of standard parts can reduce procurement costs, facilitate replacement of parts, and also does not require the use of special tools for disassembly and assembly of the locking piece 5, which facilitates quick disassembly and assembly of the test device and efficient completion of the bending test of the bending sample 9.

[0055] In another preferred embodiment, the bottom end of the locking piece 5 is provided with a connecting part with a dovetail-shaped structure in cross section, and the first limiting groove 101 is a dovetail-shaped groove hole with a wide bottom and a narrow upper part, the connecting part of the locking piece 5 is used for slidingly embedding the first limiting groove 101 from the opening at one end of the first limiting groove 101, so as to limit the locking piece 5 vertically, so that the locking piece 5 cannot be pulled out upward, but can only be adjusted in position along the first limiting groove 101, and the locking piece 5 cooperates with the nut 6 to press and limit the pressing piece 4.

[0056] Preferably, as shown in Figure 1 , 2 , and 3, the top of the bending press plate 7 is provided with a detachable connecting ring 8, and the connecting ring 8 is used for connecting with the lifting mechanism of the universal testing machine.

[0057] It can be understood that the detachable connecting ring 8 can be conveniently and flexibly replaced to adapt to different universal testing machines, and the adaptability of the bending press plate 7 can also be improved by flexibly replacing different connecting rings 8.

[0058] Optionally, the top of the bending press plate 7 is provided with an assembly screw hole, and the assembly screw hole is used for threadedly connecting with the preset stud on the connecting ring 8 to realize quick disassembly and assembly of the connecting ring 8.

[0059] Preferably, the bottom surface of the bending press plate 7 is an inclined surface that is inclined upward in the direction towards the bending part of the bending sample 9.

[0060] It should be noted that, since the bending sample 9 has a rebounding feature, the bottom surface working surface of the bending presser plate 7 can be processed into a certain inclination, so as to form an inclined surface inclined upward in the direction towards the bending part of the bending sample 9, and the bending sample 9 is slightly over-bent, so as to ensure that the bending sample 9 is finally bent to 180°, and to avoid that the bending is not in place due to too much rebounding.

[0061] It should be noted that, in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but also other elements not explicitly listed, or inherent to such a process, method, article, or apparatus.

[0062] The principles and implementation manners of the present application are described by using specific examples in this document, and the above example is only used to help understand the method of the present application and its core idea. The above description is only the preferred implementation manner of the present application, and it should be noted that, due to the limited expression of the text, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements, or changes can be made without departing from the principles of the present application, and the above technical features can be combined in an appropriate manner; the improvements, refinements, changes, or combinations, or the direct application of the technical concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection of the present application.

Claims

1. A plate bending test device for performing a 180° bending test on a bending test specimen (9) which has been pre-compressed in cooperation with a universal testing machine, characterized by, The plate bending test device comprises a support plate (1), a support block (2), a bending pressure head (3), a pressing part (4), a locking part (5) and a bending pressure plate (7): The support plate (1) is used for being fixed on the loading platform of the universal testing machine, the support block (2) is used for being clamped on the support plate (1), the bending pressure head (3) is used for being clamped on the support block (2), the pressing part (4) is used for being matched with the support plate (1) to press and limit the first end of the bending sample (9) on the support plate (1), the locking part (5) is used for being pressed and fixed on the support plate (1), the bending pressure plate (7) is used for being connected with the lifting mechanism of the universal testing machine and being driven by the lifting mechanism to press and bend the second end of the bending sample (9), and the bending pressure head (3) is also used for abutting against the bending part of the bending sample (9) and limiting the bending sample (9) during the bending process.

2. The apparatus of claim 1, wherein A plurality of second limiting grooves (102) are arranged on one side of the support plate (1) along the length direction of the support plate (1), and a plurality of first connecting bosses (202) are arranged on the bottom end of the support block (2), the first connecting bosses (202) are used for being inserted into the second limiting grooves (102) to clamp the support block (2) on the support plate (1).

3. The apparatus of claim 2, wherein: A limiting groove is arranged between each first connecting boss (202) on the bottom end of the support block (2), and the limiting groove is used for penetrating the first end of a different bending sample (9).

4. The apparatus of claim 1, wherein A third limiting groove (201) is arranged on the side wall of the support block (2) facing the bending pressure head (3), and a second connecting boss (301) is arranged on the bending pressure head (3), the second connecting boss (301) is used for being inserted into the third limiting groove (201) to clamp the bending pressure head (3) on the support block (2).

5. The apparatus of claim 4 wherein, The bending pressure head (3) comprises a cylindrical limiting part, the cross section of the limiting part is semicircular, the arc top surface of the limiting part is used for abutting against the bending part of the bending sample (9), and the second connecting boss (301) is arranged on the bottom end of the limiting part.

6. The apparatus of claim 5 wherein, The end faces of the opposite sides of the limiting part are both provided with angle scale lines.

7. The apparatus of claim 1 wherein, A first limiting groove (101) is arranged on the support plate (1) along the length direction of the support plate (1), a plurality of locking through holes are arranged on the pressing part (4) at intervals, and the locking part (5) is used for being penetrated through the locking through holes and matched with the connecting screw hole prearranged in the first limiting groove (101) to lock and limit the pressing part (4) on the support plate (1) and press and limit the first end of the bending sample (9).

8. The apparatus of claim 7, wherein the plurality of rollers are arranged in a circular pattern. The locking part (5) comprises a locking screw, the first end of the locking screw is used for being threadedly matched with the connecting screw hole prearranged in the first limiting groove (101), the second end of the locking screw is connected with a nut (6), and the nut (6) is used for pressing and limiting the pressing part (4).

9. The apparatus of claim 1, wherein, A detachable connecting ring (8) is arranged on the top of the bending pressure plate (7), and the connecting ring (8) is used for being connected with the lifting mechanism of the universal testing machine.

10. The apparatus for bending test of sheet material according to claim 1, wherein The bottom surface of the bending pressure plate (7) is an inclined surface which is inclined upward in the direction facing the bending part of the bending sample (9).

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