Flexible beam fatigue test device

Abstract

The invention discloses a flexible beam fatigue test device which is characterized in that in an end support assembly of the device, an end support is fixedly mounted on a bottom plate through a mounting part of the end support, and a double-lug connecting part of the end support is fixedly connected with a single-lug end of a flexible beam support end joint through a flexible beam support bolt; the other end of the flexible beam support end joint is fixedly connected with one end, close to the end support, of the flexible beam through a flexible beam support end bolt; the end, away from the end support, of the flexible beam is connected with the loading connector assembly through a bolt. A side support in the side support assembly is fixedly installed on the bottom plate through an installation part of the side support and located in the middle of the flexible beam. The connecting plate is fixedly mounted on the side support; a groove is formed in an inner side cover plate of the flexible beam fixing assembly, a flexible beam is embedded and installed through the groove, and an outer side cover plate is fixedly connected with the inner side cover plate through a cover plate bolt so that the flexible beam can be fixed between the inner side cover plate and the outer side cover plate. The connecting plate of the side support assembly is connected with the inner side cover plate; the flexible beam fatigue test device applies a flexible beam fatigue test load through the loading joint assembly. According to the technical scheme, the problems that flapping, torque and shimmy loads cannot be loaded at the same time and the loading frequency is low in an existing fatigue test mode for the flexible beam are solved.

Description

Technical Field

[0001] The invention relates to the field of, but is not limited to, fatigue testing technology for helicopter flexible beams, and in particular to a flexible beam fatigue testing device. Background Art

[0002] The flexible beam is an important load-bearing component of the helicopter. The stress environment is complex. In order to understand the strength and fatigue life of the flexible beam, fatigue tests must be conducted on the flexible beam to obtain the fatigue characteristics of the flexible beam and then give the life of the flexible beam. When conducting fatigue tests on the flexible beam, it is required to simulate the stress state of the flexible beam on the helicopter.

[0003] At present, the three-point bending test method is used in the fatigue test of flexible beams in my country. This test method cannot load swing, torque and swing loads at the same time, and the loading frequency is low. Summary of the invention

[0005] Purpose of the present invention: In order to solve the above-mentioned problems, an embodiment of the present invention provides a flexible beam fatigue testing device to solve the existing fatigue testing method for flexible beams. Due to the use of a three-point bending test method, the test scheme cannot simultaneously load swinging, torque and swing loads, and the loading frequency is low.

[0006] Technical solution of the present invention: The embodiment of the present invention provides a flexible beam fatigue test device, comprising: a base plate 1, an end support assembly, a side support assembly, a flexible beam fixing assembly and a loading joint assembly;

[0007] Wherein, the end support assembly comprises: an end support 2, a support bolt 3, a flexible beam support end joint 4 and a flexible beam support end bolt 5; the end support 2 is fixedly mounted on the base plate 1 through its mounting portion, and its double-ear connecting portion is fixedly connected to the single-ear end of the flexible beam support end joint 4 through the flexible beam support bolt 3; the other end of the flexible beam support end joint 4 is fixedly connected to the end of the flexible beam 6 close to the end support 2 through the flexible beam support end bolt 5; the end of the flexible beam 6 away from the end support 2 is connected to the loading joint assembly through bolts;

[0008] The side support assembly includes: a side support 7 and a connecting plate 8; the side support 7 is fixedly mounted on the bottom plate 1 through its mounting portion and is located on one side of the middle of the flexible beam 6; the connecting plate 8 is fixedly mounted on the mounting surface of the side support 7 and faces the flexible beam 6;

[0009] The flexible beam fixing assembly includes: an outer cover plate 12, an inner cover plate 13, and a cover plate bolt 14; a groove is provided on one end surface of the inner cover plate 13, for embedding and installing the flexible beam 6 through the groove, and the outer cover plate 12 is fixedly connected to the inner cover plate 13 through the cover plate bolt 14, so as to fix the flexible beam 6 between the inner cover plate 13 and the outer cover plate 12;

[0010] The end surface of the connecting plate 8 of the side support assembly is provided with an inserting groove, and the other end surface of the inner cover plate 13 is provided with an inserting boss, so that the inner cover plate 13 can be inserted into the inserting groove of the connecting plate 8 through the inserting boss;

[0011] The flexible beam fatigue test device is used to apply the flexible beam fatigue test load through the loading joint assembly, and during the flexible beam fatigue test, the middle area of ​​the flexible beam 6 is fixed by the side support assembly and the flexible beam fixing assembly.

[0012] Optionally, in the flexible beam fatigue test device as described above, the end support assembly further comprises: an end support bolt 16;

[0013] The mounting portion of the end support 2 is fixedly screwed to the threaded hole at the corresponding position of the bottom plate 1 through the end support bolt 16;

[0014] A plurality of bolt holes are arranged in the middle of the base plate 1; the side support assembly further comprises: a connecting plate bolt 9 and a side support bolt 15; the mounting portion of the side support 7 is fixedly screwed to the threaded hole at the corresponding position of the base plate 1 by the side support bolt 15, and the connecting plate 8 is fixedly screwed to the mounting end surface of the side support 7 by the connecting plate bolt 9.

[0015] Optionally, in the flexible beam fatigue testing device as described above,

[0016] The end support 2 is fixedly connected to the bottom plate 1 by welding, the side support 7 is fixedly connected to the bottom plate 1 by welding; and the side support 7 is fixedly connected to the connecting plate 8 by welding.

[0017] Optionally, in the flexible beam fatigue testing device as described above,

[0018] The end support 2 and the bottom plate 1 are configured as an integrated structure, the side support 7 and the bottom plate 1 are configured as an integrated structure; and the side support 7 and the connecting plate 8 are configured as an integrated structure.

[0019] Optionally, in the flexible beam fatigue testing device as described above, the end support assembly further includes: a spherical bearing;

[0020] The single ear end of the flexible beam support end joint 4 is equipped with a spherical bearing, and the spherical bearing is installed on the connecting hole between the single ear end of the flexible beam support end joint 4 and the double ear connecting part of the support bolt 3.

[0021] Optionally, in the flexible beam fatigue test device as described above, the flexible beam support end joint 4 is a steel wire rope;

[0022] The support bolts 3 installed on the double-ear connection part of the end support 2 and the flexible beam support end bolts 5 installed on one end of the flexible beam 6 close to the end support 2 are wound around the steel wire rope.

[0023] Optionally, in the flexible beam fatigue test device as described above, the loading joint assembly comprises: a loading joint 10, a loading joint bolt 11 and an eccentric shaft a;

[0024] The end of the flexible beam 6 away from the end support 2 is specifically screwed and fixed to the loading joint 10 through a loading joint bolt 11; the loading joint 10 is fixedly connected to the eccentric shaft a through a threaded connection or welding;

[0025] The flexible beam fatigue test device is used to apply a flexible beam fatigue test load via an eccentric shaft a of a loading joint assembly.

[0026] Optionally, the flexible beam fatigue test device as described above further includes: 2 sets of flexible beam connection pressure plates;

[0027] The two ends of the flexible beam 6 are respectively fixedly connected to a group of flexible beam connecting pressure plates; the other end of the flexible beam support end joint 4 is specifically fixedly connected to a group of flexible beam connecting pressure plates at one end of the flexible beam 6 close to the end support 2 through the support end bolt 5, and the loading joint 10 is specifically fixedly connected to a group of flexible beam connecting pressure plates at one end of the flexible beam 6 away from the end support 2 through the loading joint bolt 11.

[0028] Beneficial effects of the present invention: The embodiment of the present invention provides a flexible beam fatigue test device, on the one hand, one end of the flexible beam is fixedly connected by the bottom plate 1 and the end support assembly; on the other hand, the other end of the flexible beam 6 is connected by the loading joint assembly, and the loading joint assembly serves as a force-applying component for applying the fatigue test load; on the one hand, the position of the middle area of ​​the flexible beam is limited by the bottom plate 1 and the side support assembly. By adopting the flexible beam fatigue test device provided by the embodiment of the present invention, the flexible beam fatigue test load can be applied by the loading joint assembly, thereby ensuring that the swing, torque and swing loads are loaded simultaneously during the fatigue test; in addition, during the flexible beam fatigue test, the middle area of ​​the flexible beam 6 can be fixed by the side support assembly and the flexible beam fixing assembly to maintain the stability of the flexible beam 6 during the fatigue test; furthermore, the flexible beam fatigue test device has a simple structure and is easy to disassemble and assemble, and can meet the load loading requirements during the flexible beam fatigue test. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0030] Figure 1A schematic diagram of the overall structure of a flexible beam fatigue testing device provided by an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A side view of a flexible beam fatigue testing apparatus provided by the illustrated embodiment. Specific implementation plan

[0032] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0033] As explained in the above background technology, the flexible beam is an important load-bearing component of the helicopter, and fatigue test must be performed on the flexible beam. The existing fatigue test method for the flexible beam adopts the three-point bending test method, which leads to the problem that the swing, torque and swing loads cannot be loaded simultaneously in the test scheme, and the loading frequency is low.

[0034] To solve the above problems, an embodiment of the present invention provides a flexible beam fatigue testing device, which can meet the complex load loading requirements of the flexible beam and achieve the purpose of assessing the fatigue performance of the flexible beam; in addition, the fatigue test loading method provided by the embodiment of the present invention is a cantilever beam loading method, there is no test device similar to the technical solution of the present invention, and no relevant foreign public literature has been retrieved.

[0035] The present invention provides the following specific embodiments which can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0036] Figure 1 The overall structural diagram of a flexible beam fatigue testing device provided by an embodiment of the present invention is as follows: Figure 2 for Figure 1 The side view of the flexible beam fatigue test device provided in the embodiment shown. Figure 1 and Figure 2 As shown, the structure of the flexible beam fatigue testing device provided by the embodiment of the present invention includes: a base plate 1, an end support assembly, a side support assembly, a flexible beam fixing assembly and a loading joint assembly.

[0037] Reference Figure 1 and Figure 2In the structure of the flexible beam fatigue test device shown, the end support assembly includes: an end support 2, a support bolt 3, a flexible beam support end joint 4 and a flexible beam support end bolt 5; the end support 2 is fixedly installed on the base plate 1 through its mounting portion, and its double-ear connecting portion is fixedly connected to the single-ear end of the flexible beam support end joint 4 through the support bolt 3; the other end of the flexible beam support end joint 4 is fixedly connected to the end of the flexible beam 6 close to the end support 2 through the flexible beam support end bolt 5; the end of the flexible beam 6 away from the end support 2 is connected to the loading joint assembly through bolts.

[0038] Reference Figure 1 and Figure 2 As shown, the side support assembly in the embodiment of the present invention includes: a side support 7 and a connecting plate 8; the side support 7 is fixedly mounted on the base plate 1 through its mounting portion and is located on one side of the middle of the flexible beam 6; the connecting plate 8 is fixedly mounted on the mounting surface of the side support 7 and faces the flexible beam 6.

[0039] Reference Figure 1 and Figure 2 As shown, the flexible beam fixing assembly in the embodiment of the present invention includes: an outer cover plate 12, an inner cover plate 13, and a cover plate bolt 14; wherein, a groove is opened on one side end surface of the inner cover plate 13 for embedding and installing the flexible beam 6 through the groove, and the outer cover plate 12 is fixedly connected to the inner cover plate 13 by the cover plate bolt 14 to fix the flexible beam 6 between the inner cover plate 13 and the outer cover plate 12.

[0040] In the embodiment of the present invention, an inserting groove is provided on the end surface of the connecting plate 8 of the side support assembly, and an inserting boss is provided on the other end surface of the inner cover plate 13 so that the inner cover plate 13 can be inserted into the inserting groove of the connecting plate 8 through the inserting boss.

[0041] The flexible beam fatigue test device provided in an embodiment of the present invention can apply the flexible beam fatigue test load through the loading joint assembly, thereby ensuring that the swinging, torque and swing loads are loaded simultaneously during the fatigue test; in addition, during the flexible beam fatigue test, the middle area of ​​the flexible beam 6 can be fixed by the side support assembly and the flexible beam fixing assembly to maintain the stability of the flexible beam 6 during the fatigue test.

[0042] In one implementation of the embodiment of the present invention, Figure 1 As shown, the above-mentioned end support assembly also includes: an end support bolt 16.

[0043] In this implementation, the mounting portion of the end support 2 is fixedly screwed to the threaded hole at the corresponding position of the base plate 1 through the end support bolt 16 .

[0044] In addition, multiple groups of bolt holes are arranged in the middle of the bottom plate 1; the side support assembly also includes: connecting plate bolts 9 and side support bolts 15; in specific implementation, the mounting portion of the side support 7 is fixedly screwed to the threaded holes at the corresponding positions of the bottom plate 1 through the side support bolts 15, and the connecting plate 8 is fixedly screwed to the mounting end surface of the side support 7 through the connecting plate bolts 9. In this implementation, the position of the side support assembly on the bottom plate 1 can be adjusted and installed by the positions of the bolt holes on the bottom plate 1.

[0045] In one implementation of the embodiment of the present invention, the end support 2 is fixedly connected to the base plate 1 by welding, the side support 7 is fixedly connected to the base plate 1 by welding; and the side support 7 is fixedly connected to the connecting plate 8 by welding.

[0046] In one implementation of the embodiment of the present invention, the end support 2 and the base plate 1 are configured as an integral structure; the side support 7 and the base plate 1 are configured as an integral structure; and the side support 7 and the connecting plate 8 are configured as an integral structure.

[0047] In one implementation of the embodiment of the present invention, the end support assembly may further include: a joint bearing. In this implementation, the single ear end of the flexible beam support end joint 4 is equipped with a joint bearing, and the joint bearing is installed on the connection hole between the single ear end of the flexible beam support end joint 4 and the double ear connection part of the support bolt 3.

[0048] In one implementation of an embodiment of the present invention, the flexible beam support end joint 4 is implemented by, for example, a steel wire rope, and the steel wire rope is wrapped around the support bolt 3 installed on the double-ear connection part of the end support 2 and the flexible beam support end bolt 5 installed at one end of the flexible beam 6 close to the end support 2 to form a connection structure between the support bolt 3 and the flexible beam support end bolt 5.

[0049] In one implementation of the embodiment of the present invention, a structural form of a loading joint assembly is provided, such as Figure 1 As shown, the loading joint assembly includes: a loading joint 10, a loading joint bolt 11 and an eccentric shaft a.

[0050] In this implementation, one end of the flexible beam 6 away from the end support 2 is screwed and fixed to the loading joint 10 through a loading joint bolt 11; the loading joint 10 is fixedly connected to the eccentric shaft a through a threaded connection or welding.

[0051] In a specific implementation, the embodiment of the present invention may further include: 2 groups of flexible beams connecting the pressure plates;

[0052] The two ends of the flexible beam 6 are respectively fixedly connected to a group of flexible beam connecting pressure plates; the other end of the flexible beam support end joint 4 is specifically fixedly connected to a group of flexible beam connecting pressure plates at one end of the flexible beam 6 close to the end support 2 through the flexible beam support end bolts 5, and the loading joint 10 is specifically fixedly connected to a group of flexible beam connecting pressure plates at one end of the flexible beam 6 away from the end support 2 through the loading joint bolts 11.

[0053] The flexible beam fatigue test device provided by the embodiment of the present invention, on the one hand, fixes one end of the flexible beam through the base plate 1 and the end support assembly; on the other hand, connects the other end of the flexible beam 6 through the loading joint assembly, and the loading joint assembly serves as a force-applying component for applying the fatigue test load; on the other hand, the position of the middle area of ​​the flexible beam is limited by the base plate 1 and the side support assembly. By adopting the flexible beam fatigue test device provided by the embodiment of the present invention, the flexible beam fatigue test load can be applied through the loading joint assembly, thereby ensuring that the swing, torque and swing loads are loaded simultaneously during the fatigue test; in addition, during the flexible beam fatigue test, the middle area of ​​the flexible beam 6 can be fixed by the side support assembly and the flexible beam fixing assembly to maintain the stability of the flexible beam 6 during the fatigue test; furthermore, the flexible beam fatigue test device has a simple structure and is easy to disassemble and assemble, and can meet the load loading requirements during the flexible beam fatigue test.

[0054] The implementation of the flexible beam fatigue testing device provided by the present invention is schematically described below through a specific embodiment.

[0055] Example

[0056] This embodiment provides a flexible beam fatigue test loading device, referring to Figure 1 and Figure 2 As shown, the flexible beam fatigue test loading device includes: a base plate 1, an end support 2, a support bolt 3, a flexible beam support end joint 4, a flexible beam support end bolt 5, a flexible beam 6, a side support 7, a connecting plate 8, a connecting plate bolt 9, a loading joint 10, a loading joint bolt 11, an outer cover plate 12, an inner cover plate 13, a cover plate bolt 14, a side support bolt 15, and an end support bolt 16.

[0057] In this embodiment, a threaded hole is formed on the end surface of the bottom plate 1, and a hole is formed on the mounting portion of the end support 2. The mounting portion of the end support 2 is fixedly mounted on the bottom plate 1 by the end support bolt 16. The mounting portion of the flexible beam support end joint 4 is provided with a hole, and the end support 2 is provided with a hole. The flexible beam support end joint 4 is connected to the end support 2 by the support bolt 3. Figure 1As shown, there is a hole at the left end of the flexible beam 6, and there is a hole at the flexible beam support end joint 4, and the flexible beam support end joint 4 is connected to the left end of the flexible beam 6 through the flexible beam support end bolt 5. There is a hole at the right end of the flexible beam 6, and there is a hole on the loading joint 10, and the loading joint 10 is connected to the right end of the flexible beam 6 through the loading joint bolt 11. There is a groove on one end face of the inner cover plate 13, and the flexible beam 6 is embedded in the groove of the inner cover plate 13. The outer cover plate 12 is connected to the inner cover plate 13 through the cover plate bolt 14, and the flexible beam 6 is fixed in the groove of the inner cover plate 13. There is a boss on the other end face of the inner cover plate 13, and there is a groove on the mounting end face of the connecting plate 8. The boss on the inner cover plate 13 is inserted into the groove on the mounting end face of the connecting plate 8. There is a hole on the connecting plate 8, and the connecting plate 8 is fixedly connected to the mounting end face of the side support 7 through the connecting plate bolt 9. The bottom mounting portion of the side support 7 is provided with a hole, the bottom plate 1 is provided with a threaded hole, and the side support 7 is fixedly mounted on the bottom plate 1 by means of the side support bolts 15 .

[0058] An eccentric shaft a is provided on the loading joint 10 of this embodiment, and the actuator applies the flexible beam fatigue test load through the eccentric shaft a.

[0059] In a preferred implementation of this embodiment, a spherical bearing is mounted on the end joint 4 of the flexible beam support, and the spherical bearing is mounted on a hole connected to the support bolt 3.

[0060] In an optional implementation of this embodiment, the flexible beam support end joint 4 can be a steel wire rope.

[0061] In an optional implementation of this embodiment, the end support 2 and the base plate 1 can be welded.

[0062] In an optional implementation of this embodiment, the side support 7 and the connecting plate 8 can be integrated, and this structural arrangement can reduce the number of parts.

[0063] In an optional implementation of this embodiment, the loading joint 10 and the eccentric shaft a may be connected by threaded connection, welding, or the like.

[0064] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A flexible beam fatigue test device, characterized in that: include: A base plate (1), an end support assembly, a side support assembly, a flexible beam fixing assembly and a loading joint assembly; The end support assembly comprises: an end support (2), a support bolt (3), a flexible beam support end joint (4) and a flexible beam support end bolt (5); the end support (2) is fixedly mounted on the base plate (1) through its mounting portion, and its double-ear connecting portion is fixedly connected to the single-ear end of the flexible beam support end joint (4) through the flexible beam support bolt (3); the other end of the flexible beam support end joint (4) is fixedly connected to the end of the flexible beam (6) close to the end support (2) through the flexible beam support end bolt (5); the end of the flexible beam (6) away from the end support (2) is connected to the loading joint assembly through a bolt; The side support assembly comprises: a side support (7) and a connecting plate (8); the side support (7) is fixedly mounted on the bottom plate (1) through its mounting portion and is located on one side of the middle of the flexible beam (6); the connecting plate (8) is fixedly mounted on the mounting surface of the side support (7) and faces the flexible beam (6); The flexible beam fixing assembly comprises: an outer cover plate (12), an inner cover plate (13), and cover plate bolts (14); a groove is provided on one end surface of the inner cover plate (13) for embedding and installing the flexible beam (6) through the groove; the outer cover plate (12) is fixedly connected to the inner cover plate (13) through the cover plate bolts (14) so ​​as to fix the flexible beam (6) between the inner cover plate (13) and the outer cover plate (12); The end surface of the connecting plate (8) of the side support assembly is provided with an inserting groove, and the other end surface of the inner cover plate (13) is provided with an inserting boss, so that the inner cover plate (13) can be inserted into the inserting groove of the connecting plate (8) through the inserting boss; The flexible beam fatigue test device is used to apply a flexible beam fatigue test load through a loading joint assembly, and during the flexible beam fatigue test, the middle area of ​​the flexible beam (6) is fixed by a side support assembly and a flexible beam fixing assembly.

2. A flexible beam fatigue testing device according to claim 1, characterized in that: The end support assembly further comprises: an end support bolt (16); The mounting portion of the end support (2) is fixedly screwed to the threaded hole at the corresponding position of the base plate (1) via the end support bolt (16); A plurality of groups of bolt holes are arranged in the middle of the base plate (1); the side support assembly further comprises: a connecting plate bolt (9) and a side support bolt (15); the mounting portion of the side support (7) is fixedly screwed to the threaded hole at a corresponding position of the base plate (1) by the side support bolt (15), and the connecting plate (8) is fixedly screwed to the mounting end surface of the side support (7) by the connecting plate bolt (9).

3. A flexible beam fatigue testing device according to claim 1, characterized in that: The end support (2) and the bottom plate (1) are fixedly connected by welding, the side support (7) and the bottom plate (1) are fixedly connected by welding; and the side support (7) and the connecting plate (8) are fixedly connected by welding.

4. A flexible beam fatigue testing device according to claim 1, characterized in that: The end support (2) and the bottom plate (1) are configured as an integrated structure, the side support (7) and the bottom plate (1) are configured as an integrated structure; and the side support (7) and the connecting plate (8) are configured as an integrated structure.

5. A flexible beam fatigue testing device according to any one of claims 1 to 4, characterized in that: The end support assembly further includes: a spherical bearing; The single ear end of the flexible beam support end joint (4) is equipped with a joint bearing, and the joint bearing is installed on the connecting hole between the single ear end of the flexible beam support end joint (4) and the double ear connecting part of the support bolt (3).

6. A flexible beam fatigue testing device according to any one of claims 1 to 4, characterized in that: The flexible beam support end joint (4) is a steel wire rope; A support bolt (3) installed on the double-ear connection portion of the end support (2) is wound around the steel wire rope, and a flexible beam support end bolt (5) installed on one end of the flexible beam (6) close to the end support (2).

7. A flexible beam fatigue testing device according to any one of claims 1 to 4, characterized in that: The loading joint assembly comprises: a loading joint (10), a loading joint bolt (11) and an eccentric shaft (a); One end of the flexible beam (6) away from the end support (2) is screwed and fixed to the loading joint (10) via a loading joint bolt (11); the loading joint (10) is fixedly connected to the eccentric shaft (a) via a threaded connection or welding; The flexible beam fatigue test device is used to apply a flexible beam fatigue test load through an eccentric shaft (a) of a loading joint assembly.

8. A flexible beam fatigue testing device according to claim 7, characterized in that: Also includes: 2 sets of flexible beams connect the pressure plates; The two ends of the flexible beam (6) are respectively fixedly connected to a group of flexible beam connection pressure plates; the other end of the flexible beam support end joint (4) is fixedly connected to a group of flexible beam connection pressure plates at one end of the flexible beam (6) close to the end support (2) via a support end bolt (5); and the loading joint (10) is fixedly connected to a group of flexible beam connection pressure plates at one end of the flexible beam (6) away from the end support (2) via a loading joint bolt (11).

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