A large-tonnage axial bidirectional fatigue loading test device for elastic support joints

Abstract

The present invention relates to the technical field of fatigue testing of rubber elastic elements, specifically to a large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints, comprising a radial loading component, an axial loading component, a fixed component and a loading platform, wherein the fixed component is placed above the loading platform, the radial loading component applies a radial loading force to the elastic support joint in the fixed component from the bottom of the loading platform upward, the axial loading component applies an axial loading force perpendicular to the radial loading force to the elastic support joint in the fixed component from the upper side of the loading platform, and the power output rod of the axial loading component and the radial loading component are in a linkage state of the same upper and lower. The present invention can perform fatigue loading tests on elastic support joints in radial and axial directions at the same time, with a large loading load, and can meet the large-tonnage loading requirements of fan equipment.

Description

Technical Field

[0001] The invention relates to a large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints, which is mainly used for radial and axial large-tonnage bidirectional loading tests of elastic joints for wind power generation vibration reduction, and belongs to the technical field of fatigue testing of rubber elastic elements. Background Art

[0002] Using renewable energy for people's production and life is a manifestation of the progress of human civilization, the result of scientific and technological development, the embodiment of environmental protection concepts, and an important indicator requirement for a country's environmental protection. Wind energy is a renewable energy source with large-scale development and commercial development prospects. The development of wind energy can reduce environmental pollution and mitigate global warming, but if it is not handled properly, it will cause noise pollution. In recent years, the noise generated by wind turbines has become more and more disturbing to the public, so it is very necessary to take vibration reduction and noise reduction measures. The noise of wind turbines is mainly divided into two parts: mechanical transmission and aerodynamics. The main noise is generated by mechanical transmission. In order to reduce the mechanical vibration and noise in the gearbox when the wind turbine is running, many wind power equipment are currently installed with rubber elastic support joints in the unit to effectively improve the running stability of the unit and reduce noise.

[0003] The elastic support joint is an elastomer made of rubber and metal parts vulcanized under high temperature and high pressure. It usually includes two types: laminated type and tile type. It is mainly composed of metal partitions, rubber layers and bearing plates. They are installed in the gearbox of the wind turbine in pairs in a pre-compressed manner to play the role of vibration reduction and torque transmission. In actual working conditions, the elastic support joint always carries radial and axial loads at the same time, and the radial load is usually 2000kN and the axial load is 200kN. At present, the relatively mature and traditional test devices for rubber elastic elements for rail transit vibration reduction mostly carry out radial, deflection and torsion combined loading tests. The bidirectional loading technology of radial loading and axial loading is not mature enough, and the radial test load is usually less than 200kN and the axial load is less than 30kN. If such a large tonnage of bidirectional load is applied to the elastic support joint through testing, the existing test device is difficult to meet the test requirements. After patent search, the existing technology center has the following patents involving test devices for elastic support joints:

[0004] 1. The invention patent with the patent publication number of "CN107179183B" and the patent name of "Three-way loading fatigue test device for ball joints" includes a vertical power mechanism 1 for providing power for radial loading of the test ball joint, a vertical power mechanism 2 for providing power for deflection loading and torsion loading of the test ball joint, a radial force device for applying radial load to the test ball joint, a deflection force device for applying deflection load to the test ball joint, a torsion force device for applying torsion load to the test ball joint, a ball joint positioning device for positioning the test ball joint and a horizontal workbench. The vertical power mechanism 1 and the vertical power mechanism 2 are arranged side by side above the workbench. The three-way loading fatigue test device for ball joints provided by the invention has a compact structure, occupies a small space and has high synchronization of three-way loading. However, the test device mainly has the following problems:

[0005] 1) The loading method and principle of the device mainly use the force arm to achieve torsion and deflection, and cooperate with radial loading to achieve compression-torsion and compression-deflection loading. The loading load is small and it is difficult to meet the requirements of large tonnage loading.

[0006] 2) The composite loading of the rubber elastic joint by the device is carried out in radial, deflection and torsion directions, while the elastic support joint in this patent requires combined loading in radial and axial directions, both of which are linear loadings, and has higher requirements for the coordination and non-interference of radial and axial loading, which the loading device in this patent cannot meet.

[0007] 2. The invention patent with the patent publication number of "CN113686689A" and the patent name of "Device and method for combined loading test of rubber elastic elements of rail vehicles" includes a simulated bogie assembly and a simulated car body assembly. The simulated bogie assembly includes a guide unit, a horizontal loading unit and a connecting rod unit. The rubber elastic element is vertically loaded by applying a vertical loading force downward to the guide unit; the connecting rod unit includes a first connecting rod and a second connecting rod that are perpendicular to each other. The rubber elastic element is transversely loaded and longitudinally loaded by the first connecting rod and the second connecting rod, so as to realize the vertical, longitudinal and transverse three-dimensional loading test of the rubber elastic element at the same time. However, the test device has the following problems:

[0008] 1) Structure: This device is mainly used to conduct vertical, lateral and longitudinal three-way compression and shear composite fatigue tests on compression and shear rubber spring products. It applies lateral and longitudinal loads respectively through two sets of independent four-column frame systems, and cannot perform radial and axial bidirectional loading tests on elastic support joints.

[0009] 2) Loading method: The device is tested by combining two products, mainly using product pairs to eliminate friction, and the applicable load-bearing capacity is limited; the elastic support joint in this patent is tested on a single product, and the test load is more than 10 times that of the test product in the patent. The solution in the patent cannot meet the loading requirements of the elastic support joint.

[0010] In summary, how to design a fatigue test device that can meet the requirements of radial and axial bidirectional loading and can carry out large-tonnage loading at the same time, so as to carry out radial and axial large-tonnage bidirectional loading tests on elastic support joints for wind power generation vibration reduction, is a problem that needs to be solved urgently. Summary of the invention

[0011] The large-tonnage radial-axial bidirectional fatigue loading test device for the elastic support joint provided by the present invention applies a radial loading force to the elastic support joint from the bottom of the loading platform upward through a radial loading component, and applies an axial loading force perpendicular to the radial loading force to the elastic support joint from the upper side of the loading platform through an axial loading component, thereby realizing the linkage of radial loading and axial loading, and meeting the large-tonnage loading requirements of the fan equipment.

[0012] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints, comprising a radial loading component, an axial loading component and a loading platform, a frame-type fixing component on which the elastic support joint is placed is provided on the loading platform, the radial loading component applies a radial loading force to the elastic support joint in the fixing component from the bottom of the loading platform upward, the axial loading component applies an axial loading force perpendicular to the radial loading force to the elastic support joint in the fixing component from the upper side of the loading platform, the fixing component and the axial loading component are both in an upward and downward linkage state with the power output rod of the radial loading component; the fixing component comprises an inner frame fixing part and an outer frame fixing part located on the peripheral side of the inner frame fixing part, the elastic support joint is supported in the inner frame fixing part, and the axial loading force applied to the elastic support joint can form a closed loop of force through the inner frame fixing part and the outer frame fixing part to enhance the stability of the loading.

[0013] Preferably, the inner frame fixing portion includes a support seat and two side supports arranged on the support seat, the two side supports are arranged perpendicular to the axial load M direction, and the core shaft of the elastic support joint is mounted on the two side supports; the inner frame fixing portion also includes a two-petal locking sleeve arranged between the two side supports, the two-petal locking sleeves are mounted up and down on the outside of the two-petal outer sleeves of the elastic support joint, and the two-petal outer sleeves are pressed onto the rubber vulcanized body of the elastic support joint by the two-petal locking sleeves being mounted and clamped, and the required pre-tightening compression force is applied to the elastic support joint.

[0014] Preferably, the outer frame fixing part includes two side support plates arranged on the outside of the side support, and the middle part of the side support plate is provided with a middle through hole for axially loading the elastic support joint; a locking rod located on the outside of the inner frame fixing part is connected between the two side support plates along the M direction.

[0015] Preferably, a locking plate clamped on the outside of the outer sleeve is provided between the locking sleeve and the side support plate, and the outer sleeve is stably supported by the locking plate cooperating with the locking sleeve.

[0016] Preferably, reaction seats are provided on the outer end surfaces of the two side support plates, and the two reaction seats form bidirectional support for the axial thrust and axial tension in the axial loading, and cooperate with the outer frame fixing part so that the axial loading force forms a closed loop of force.

[0017] Preferably, two guide seats located on the loading platform are provided at the lower ends of the reaction seat and the side support plate, and a sliding plate located at the lower end of the support seat is provided between the two guide seats. The sliding plate can slide between the two guide seats with an elastic support joint for axial loading.

[0018] Preferably, a sliding seat is provided on the loading platform, and the sliding seat includes a base plate and two slide plates arranged on the base plate along the axial loading M direction, and a plurality of rollers located at the upper end of the base plate and perpendicular to the slide plates are provided between the two slide plates; the sliding plate can slide along the axial loading M direction between the two slide plates through the rollers.

[0019] Preferably, a loading plate is provided at the end of the core shaft of the elastic support joint, and the axial loading assembly includes an axial loading cylinder and an axial load sensor located at the end of the power output rod of the axial loading cylinder.

[0020] Preferably, the radial loading assembly includes a radial driving member located below the loading platform and a force-adding seat located above the fixed assembly, the upper end of the force-adding seat is fixedly connected to an upper plate, and the upper plate is provided with a radial load sensor; the radial driving member applies a radial loading force upward from the bottom of the loading platform, and at the same time the loading platform drives the elastic support joint to move upward and makes the force-adding seat contact with the fixed assembly, and the elastic support joint is radially loaded through the cooperation of the radial driving member and the force-adding seat.

[0021] Preferably, a bottom platform is provided at the lower end of the radial driving member, and an upper platform is provided above the upper flat plate, and the bottom platform and the upper platform are connected by vertical columns; the radial loading and axial loading of the elastic support joint are both carried out in a frame formed between the bottom platform, the upper platform and the vertical columns; the loading platform includes a lower T-shaped platform and an upper slide platform that can slide on the lower T-shaped platform, and the guide seat and the sliding seat are both located on the upper slide platform.

[0022] The beneficial effects of the invention are:

[0023] 1. The fatigue loading test device in the present invention uses a combination of radial loading and axial loading to perform fatigue tests on elastic rubber joints. Both radial loading and axial loading are linear loading, which can meet the large-tonnage loading requirements of the elastic support joints in the wind turbine.

[0024] 2. The linkage of the traditional radial and vertical loading tests is achieved by installing hinge devices in the radial and axial directions, and solving the displacement interference problem of bidirectional loading through the ball joints built into the hinge devices. This method is only suitable for vertical and horizontal bidirectional loading tests with small displacements and small loads, and this method always has friction and the disadvantage of limited rotation angle. The present invention places the radial driving member below the loading platform, and applies a radial driving force upward from the bottom of the loading platform through the radial driving member. The loading platform, the axial loading assembly, and the elastic support joint are in a linkage state with the power output rod of the radial driving member, and the deformation interference caused by bidirectional loading can be eliminated through the radial and axial bidirectional linkage.

[0025] 3. The small load axial loading test of traditional rubber elastic elements mostly uses cylindrical sliding bearings plus grease to apply axial loads, and the grease is used to eliminate the friction generated by radial loading. On the one hand, this structure is difficult to achieve the requirements of large radial load loading, and the friction is large, which makes it difficult to meet the accuracy requirements of axial loading. In addition, wear will occur during long-term testing, and thus the test requirements cannot be met. The present invention realizes axial loading through a roller, and replaces the original sliding friction with rolling friction through a roller-type rolling slide, which greatly reduces the friction of the test and improves the accuracy of the test data.

[0026] 4. Traditional axial loading usually adopts the method of installing a single reaction seat on one side of the loading end to fix the axial drive member to apply the axial load. This method is a single-sided cantilever structure. The structural strength of only one reaction seat itself bears all axial (horizontal) reaction forces, and it is impossible to form a real closed loop of force. It is only suitable for horizontal or axial loading tests with an axial force less than 30kN, and cannot meet the requirements of large-load loading tests. In the present invention, two reaction seats are provided for auxiliary axial loading. The two reaction seats are further connected by a locking rod. An independent horizontal frame system is formed by the locking rod and the two reaction seats, thereby forming a closed loop structure of force. When the axial load is applied, the two reaction seats bear a positive and a negative axial load, which greatly improves the structural strength of the loading frame and can meet the requirements of large-tonnage axial load loading tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structure diagram of the test device.

[0028] Figure 2 A schematic diagram of the local structure of the test device.

[0029] Figure 3 for Figure 2 main view.

[0030] Figure 4 for Figure 3 Cross-sectional view along the AA direction.

[0031] Figure 5 A schematic diagram of the structure of the fixed component.

[0032] Figure 6 It is a schematic diagram of the structure of the roller.

[0033] Figure 7 Schematic diagram of the structure of the elastic support joint.

[0034] The reference numerals include: bottom platform 1, upper platform 2, vertical column 3, loading platform 4, lower T-shaped platform 401, T-shaped slot 402, upper slide 403, radial drive member 5, force seat 501, upper plate 502, radial load sensor 503, axial drive member 6, loading plate 601, axial load sensor 602, stopper 603, inner frame fixing part 7, support seat 701, side support seat 702, locking sleeve 703, upper petal locking sleeve 703a, lower petal locking sleeve 703b, connecting rod 704, connecting nut 705, reinforcing rib 706, outer frame fixing part 8, side support plate 801, middle through hole 802, locking rod 803, rod nut 804, locking plate 9, weight reduction hole 901, reaction seat 10, guide seat 11, sliding plate 12, sliding seat 13, bottom plate 13a, slide plate 13b, roller 13c, elastic support joint 14, sleeve 14a, upper lobe sleeve 14a1, lower lobe sleeve 14a2, rubber vulcanized body 14b, core shaft 14c, sliding area 15. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 The embodiments of the present invention are described in detail. The axial loading direction in the embodiments is as follows: Figure 3 The M direction is shown in the figure, and the radial loading direction is shown in the figure. Figure 3 As shown in the N direction:

[0036] A large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints, such as Figure 1As shown, it includes a bottom platform 1, an upper platform 2 and four vertical columns 3 connected between the bottom platform 1 and the upper platform 2. The bottom platform 1, the upper platform 2 and the vertical columns 3 form a frame structure and a radial loading component, an axial loading component and a loading platform 4 are arranged in the frame. The radial loading and axial loading of the elastic support joint 14 are both carried out in the frame formed between the bottom platform 1, the upper platform 2 and the vertical columns 3; a frame-type fixing component is provided on the loading platform 4, and the elastic support joint 14 is fixed in the fixing component. The radial loading component includes a radial driving member 5 located between the bottom platform 1 and the loading platform. The radial driving member 5 in this embodiment is a radial loading cylinder. The radial driving member 5 applies a radial loading force to the elastic support joint 14 in the fixed component from the bottom of the loading platform 4 upward; the axial loading component includes an axial driving member 6. The axial driving member 6 is coaxially arranged with the elastic support joint 14. The axial driving member 6 is an axial loading cylinder. The axial driving member 6 applies an axial loading force perpendicular to the radial loading force to the elastic support joint 14 in the fixed component from the upper side of the loading platform 4. Both radial loading and axial loading are linear loading, and the fixed component and the axial loading component are in a linkage state with the power output rod of the radial loading component at the same top and bottom, which can eliminate the deformation interference caused by simultaneous bidirectional loading. At the same time, the loading load is large, which can meet the loading requirements of the elastic support joint 14 with a radial load of 2000kN and an axial load of 200kN.

[0037] The elastic support joint 14 in this embodiment is as follows Figure 7 As shown, it includes a core shaft 14c, a rubber vulcanized body 14b vulcanized on the outside of the core shaft 14c and a two-petal jacket 14a located on the outside of the rubber vulcanized body 14b, the two-petal jacket 14a respectively comprising an upper petal jacket 14a1 and a lower petal jacket 14a2. When a loading test is performed, it is necessary to simulate the actual working condition requirements of the elastic support joint 14, and the elastic support joint 14 is pre-stressed as a whole by the core shaft 14c and the jacket 14a before the test is performed.

[0038] like Figure 1-5As shown, the fixing assembly includes an inner frame fixing portion 7 and an outer frame fixing portion 8 located on the periphery of the inner frame fixing portion 7. The inner frame fixing portion 7 and the outer frame fixing portion 8 enable the axial loading force applied to the elastic support joint 14 to form a closed loop of force and enhance the stability of the loading. The elastic support joint 14 is supported in the inner frame fixing portion 7. The inner frame fixing portion 7 includes a support seat 701 and two side supports 702 arranged on the support seat 701. The two side supports 702 are arranged perpendicular to the axial loading direction M. A receiving groove is provided in the middle of the upper end of the side support 702. The inner frame fixing portion 7 also includes a two-petal locking sleeve 703 arranged between the two side supports 702. The two-petal locking sleeve 703 respectively includes an upper petal locking sleeve 703a and a lower petal locking sleeve 703b. The upper petal locking sleeve 703a and the lower petal locking sleeve 703b are connected and fixed by two sets of connecting rods 704. The rod 704 is a double-headed stud structure, and connecting nuts 705 are provided at the upper end of the connecting rod 704 located at the upper lobe locking sleeve 703a and the lower end of the lower lobe locking sleeve 703b. The upper lobe locking sleeve 703a and the lower lobe locking sleeve 703b are stably locked by the two connecting nuts 705 to ensure the stability of the press-fitting of the outer sleeve 14. Two groups of connecting rods 704 are respectively arranged on both sides of the upper lobe locking sleeve 703a and the lower lobe locking sleeve 703b that are perpendicular to the side support 702, and each group of connecting rods 704 includes three connecting rods 704. Before conducting the fatigue loading test, the core shaft 14c of the elastic support joint 14 is first set up in the receiving grooves of the two side supports 702, and then the upper lobe locking sleeve 703a and the lower lobe locking sleeve 703b are installed up and down on the outside of the two-lobe outer sleeve 14a of the elastic support joint 14, and the two-lobe outer sleeve 14a is pressed against the rubber vulcanized body 14b of the elastic support joint 14 by the upper lobe locking sleeve 703a and the lower lobe locking sleeve 703b are installed and clamped to press the two-lobe outer sleeve 14a onto the rubber vulcanized body 14b of the elastic support joint 14, and cooperate with the core shaft 14c to pre-press the elastic support joint 14 as a whole to apply the pre-tightening compression force required by the elastic support joint 14 in the working condition.

[0039] like Figure 1 As shown, the loading platform 4 includes a lower T-shaped platform 401 and an upper slide 403 that can slide on the lower T-shaped platform 401. The lower T-shaped platform 401 is provided with a plurality of T-shaped slots 402. The lower end of the upper slide 403 is provided with a T-shaped block that cooperates with the T-shaped slots 402. The upper slide 403 can slide horizontally on the lower T-shaped platform 401 along a direction perpendicular to the axial loading M direction through the T-shaped block to adjust the position according to actual needs.

[0040] like Figure 2-4As shown, the outer frame fixing portion 8 includes two side support plates 801 arranged on the outside of the side support 702, and the middle part of the side support plate 801 is provided with a middle through hole 802 for axially loading the elastic support joint 14; a locking rod 803 located on the outside of the inner frame fixing portion 7 is connected between the two side support plates 801 along the M direction, and the locking rod 803 is located on the outside of the two side support plates 801 and is provided with a rod nut 804, and the two side support plates 801 are stably connected by the rod nut 804 and the locking rod 803; in this embodiment, a total of four locking rods 803 are included, and two locking rods 803 are evenly provided on both sides of the inner frame fixing portion 7 in the M direction. The outer end surfaces of the two side support plates 801 are provided with reaction seats 10 located inside the locking rod 803. The two reaction seats 10 bear a positive and a negative axial load, and the two reaction seats 10 form a bidirectional support for the axial thrust and axial tension in the axial loading, and cooperate with the outer frame fixing part 8 to form a closed loop of force for the axial loading force. A locking plate 9 clamped on the outside of the outer sleeve 14a is provided between the locking sleeve 703 and the side support plate 801, and the outer sleeve 14a is stably supported by the locking plate 9 and the locking sleeve 703; a weight reduction hole 901 is provided in the middle of the locking plate 9, so that the locking plate 9 can reduce its own weight while supporting the outer sleeve 14a, thereby reducing the overall weight of the device and saving materials.

[0041] like Figure 2-3 As shown, a guide seat 11 located at the upper end of the upper slide 403 in the loading platform 4 is provided at the lower end of each side reaction seat 10 and the side support plate 801. In this embodiment, two guide seats 11 are included in total. Figure 5-6 As shown, the upper end of the upper slide 403 is also provided with a sliding seat 13 located between the two guide seats 11. The sliding seat 13 includes a bottom plate 13a and two slide slot plates 13b arranged on the bottom plate 13a along the axial loading M direction. A plurality of rollers 13c located at the upper end of the bottom plate 13a and perpendicular to the slide slot plates 13b are arranged between the two slide slot plates 13b. The lower end of the support seat 701 is provided with a sliding plate 12 that can slide along the axial loading M direction between the two slide slot plates 13b through the rollers 13c. The sliding plate 12 can slide between the two guide seats 11 with the elastic support joint 14 to perform axial loading. The distance between the two guide seats 11 is greater than the length of the sliding plate 12 in the M direction, so that there is a sliding area 15 between the two guide seats 11 for the sliding plate 12 to drive the elastic support joint 14 to perform axial sliding loading. At the same time, the two guide seats 11 limit the sliding range of the sliding plate 12 within the sliding area 15, which can prevent damage to the elastic support joint 14 due to excessive loading.

[0042] like Figure 4As shown, a loading disk 601 is provided at the end of the core shaft 14c of the elastic support joint 14, and the axial loading assembly includes an axial load sensor 602 located at the end of the power output rod of the axial loading cylinder; the power output rod is also provided with a stop platform 603 which can stop on the outside of the middle through hole 802; the axial loading force can be controlled by the axial load sensor 602, and the stop platform 603 can limit the loading distance of the axial loading cylinder. When the load is excessive, the power output rod of the axial loading cylinder is limited by the stop platform 603 on the outside of the middle through hole 803, thereby further strengthening the protection of the elastic support joint 14 during the loading process.

[0043] like Figure 1 As shown, the radial loading assembly includes a force-adding seat 501 located above the fixed assembly, and the upper end of the force-adding seat 501 is fixedly connected to an upper plate 502, and the upper plate 502 is provided with a radial load sensor 503; the radial driving member 5 applies a radial loading force upward from the bottom of the loading platform 4, and at the same time, the loading platform 4 drives the elastic support joint 14 to move upward and makes the force-adding seat 501 contact with the fixed assembly, specifically: as the loading platform 4 drives the elastic support joint 14 to move upward, the force-adding seat 501 will contact with the upper end of the upper petal locking sleeve 703a, and radially load the elastic support joint 14 through the radial driving member 5 and the force-adding seat 501; the radial load sensor 503 can control the radial loading force of the radial driving member 5.

[0044] Implementation method:

[0045] The elastic support joint 14 is fixed in the fixing assembly; the radial driving member 5 is started so that the power output rod of the radial driving member 5 pushes the loading platform 4 upward in the N direction, and the loading platform 4 moves upward and makes the force-adding seat 501 contact the upper end of the upper petal locking sleeve 703a, and the force-adding seat 501 cooperates with the radial driving member 5 to perform a radial loading fatigue test on the elastic support joint 14. At the same time, the axial loading assembly and the loading platform 4 are at the same level, and the power output rod of the axial driving member 6 is along the M direction toward the loading disk 601 to perform an axial loading fatigue test on the elastic support joint 14.

[0046] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the content of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints, comprising a radial loading component, an axial loading component and a loading platform (4), characterized in that: The loading platform (4) is provided with a frame-type fixing assembly on which an elastic support joint (14) is placed. The radial loading assembly applies a radial loading force upward to the elastic support joint (14) in the fixing assembly from the bottom of the loading platform (4). The axial loading assembly applies an axial loading force perpendicular to the radial loading force to the elastic support joint (14) in the fixing assembly from the upper side of the loading platform (4). Both the fixing assembly and the axial loading assembly are in an upper and lower linkage state with the power output rod of the radial loading assembly. The fixing assembly comprises an inner frame fixing portion (7) and an outer frame fixing portion (8) located on the periphery of the inner frame fixing portion (7). The elastic support joint (14) is supported in the inner frame fixing portion (7). (8) The axial loading force applied to the elastic support joint (14) can form a closed loop of force to enhance the stability of the loading; the inner frame fixing portion (7) comprises a support seat (701) and two side supports (702) arranged on the support seat (701), the two side supports (702) are arranged perpendicular to the axial loading direction M, and the core shaft (14c) of the elastic support joint (14) is mounted on the two side supports (702); the inner frame fixing portion (7) also comprises a two-piece locking sleeve (703) arranged between the two side supports (702), the two-piece locking sleeve (703) is mounted up and down on the outside of the two-piece outer sleeve (14a) of the elastic support joint (14), and the two-piece outer sleeve (14a) is pressed against the elastic joint (14) by the two-piece locking sleeve (703) being mounted and clamped. The outer frame fixing portion (8) comprises two side support plates (801) arranged outside the side support seat (702), and the middle portion of the side support plate (801) is provided with a middle through hole (802) for axially loading the elastic support joint (14); a locking rod (803) located outside the inner frame fixing portion (7) is connected between the two side support plates (801) along the M direction; the outer end surfaces of the two side support plates (801) are provided with reaction seats (10), and the two reaction seats (10) form a bidirectional support for the axial thrust and axial tension in the axial loading, and cooperate with the outer frame fixing portion (8) to ensure that the axial loading is not excessive. The load forms a closed loop of force; two guide seats (11) located on the loading platform (4) are provided at the lower ends of the reaction seat (10) and the side support plate (801); a sliding plate (12) located at the lower end of the support seat (701) is provided between the two guide seats (11); the sliding plate (12) can slide between the two guide seats (11) with an elastic support joint (14) to perform axial loading; a sliding seat (13) is provided on the loading platform (4); the sliding seat (13) comprises a bottom plate (13a) and two slide plates (13b) arranged on the bottom plate (13a) along the axial loading M direction; a plurality of rollers (13c) located at the upper end of the bottom plate (13a) and perpendicular to the slide plates (13b) are provided between the two slide plates (13b);The sliding plate (12) can slide along the axial loading M direction between the two slide groove plates (13b) through the roller (13c); a loading plate (601) is provided at the end of the core shaft (14c) of the elastic support joint (14); the axial loading component comprises an axial loading cylinder and an axial load sensor (602) located at the end of the power output rod of the axial loading cylinder; the radial loading component comprises a radial driving member (5) located below the loading platform (4) and a force adding seat (501) located above the fixed assembly; the upper end of the force adding seat (501) is fixedly connected to an upper plate (502); the upper plate (502) is provided with a radial load sensor (503); the radial driving member (5) applies a radial loading force upward from the bottom of the loading platform (4); at the same time, the loading platform (4) drives the elastic support joint (14) to move upward and makes the force adding seat (501) contact the fixed assembly, and the elastic support joint (14) is radially loaded by the radial driving member (5) and the force adding seat (501) cooperating. ; 2. According to the large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints of claim 1, it is characterized in that: A locking plate (9) clamped on the outside of the two-petal outer sleeve (14a) is provided between the two-petal locking sleeve (703) and the side support plate (801), and the two-petal outer sleeve (14a) is stably supported by the locking plate (9) and the two-petal locking sleeve (703).

3. According to claim 2, the large-tonnage radial-axial bidirectional fatigue loading test device for elastic support joints is characterized in that: A bottom platform (1) is provided at the lower end of the radial driving member (5), an upper platform (2) is provided above the upper plate (502), and the bottom platform (1) and the upper platform (2) are connected via a vertical column (3); radial loading and axial loading of the elastic support joint (14) are both performed within a frame formed between the bottom platform (1), the upper platform (2) and the vertical column (3); the loading platform (4) comprises a lower T-shaped platform (401) and an upper slide (403) that can slide on the lower T-shaped platform (401), and the guide seat (11) and the slide seat (13) are both located on the upper slide (403).

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