A mechanical test fixture for simulating the stress of multiple ears

Abstract

The present invention relates to the field of mechanical simulation experiments, and more specifically, the present invention relates to a mechanical test jig frame simulating the stress of multiple ears, the mechanical test jig frame comprising a front jig frame and a rear jig frame connected to the box body ears, the front jig frame and the four box body ears are all rotationally connected through a rotating shaft, the front jig frame is rotationally connected to a first force load, the rear jig frame and the four box body ears are also rotationally connected through a rotating shaft, and the rear jig frame is rotationally connected to a second force load. In the present invention, the jig frame is set as a front jig frame and a rear jig frame, so that the front jig frame and the rear jig frame are separated, and different loads are applied to the front jig frame and the rear jig frame respectively. Since the front construction frame and the rear construction frame are both rotationally connected to the box body ears, the force load can be directly transmitted to the box body ears through the front jig frame and the rear jig frame, which is convenient for simulating the actual stress conditions, reducing the generation of redundant component forces, and achieving the purpose of accurately controlling the simulated stress.

Description

Technical Field

[0001] The invention relates to the field of mechanical simulation experiments, and more specifically to a mechanical test fixture frame for simulating the forces on multiple ears. Background Art

[0002] As user needs become more personalized and diversified, how to improve the design and manufacturing efficiency of small-batch equipment has become a key issue for enterprises. The core components of small-batch equipment are usually customized products with high costs. In order to avoid damage to them during the development stage, it is necessary to develop mechanical test tools to simulate the force.

[0003] like Figure 1 A box is shown, and the bottom frame of the box is fixedly connected with four box ears 3, and the four box ears 3 are double-ear ears. The four box ears 3 are divided into two groups, namely the first group of box ears 31 and the second group of box ears 32. The two box ears 3 in each group are fixedly connected to the two sides of the box, respectively, and the upper rear end of the box is subjected to a downward inclined force F3. According to the requirements of the box interface, when designing the mechanical experimental tooling, it is converted into the known size and direction of the box rear end load F3, and then a front end load F4 is applied to the box, so that one side of the ear is subjected to the forces F1 and F2 respectively. Existing tooling often uses an integrally welded tooling to apply loads to the ears, but for complex stress conditions where multiple ears are subjected to stress at the same time, the two loads interfere with each other during the transmission process, so the integrally welded tooling is prone to uncontrollable simulated stress.

[0004] In view of the above requirements, a mechanical test fixture that simulates the stress of multiple ears is needed. Summary of the invention

[0005] In view of the fact that the overall tooling is prone to uncontrollable simulated force, the present invention innovatively provides a mechanical test tooling frame that simulates the force on multiple ears. The mechanical test tooling frame is divided into a front tooling frame and a rear tooling frame. The front tooling frame and the rear tooling frame are separated, and loads are applied to the front tooling frame and the rear tooling frame respectively. The front tooling frame and the rear tooling frame are used to apply forces F1 and F2 to each ear respectively, simulating the actual force situation, reducing the generation of excess force components, and achieving the purpose of accurately controlling the simulated force.

[0006] To achieve the above-mentioned technical objectives, the present invention discloses a mechanical test fixture for simulating the stress on multiple ears, the mechanical test fixture comprising a front fixture and a rear fixture connected to the box ears, the front fixture and the four box ears are rotatably connected via a rotating shaft, the front fixture is rotatably connected to a first force load, the rear fixture and the four box ears are also rotatably connected via a rotating shaft, and the rear fixture is rotatably connected to a second force load.

[0007] Through the above technical solution, the tooling frame is set as a front tooling frame and a rear tooling frame, so that the front tooling frame and the rear tooling frame are separated, and different loads are applied to the front tooling frame and the rear tooling frame respectively. Moreover, since the front construction frame and the rear construction frame are rotatably connected to the box support ears, the force load can be directly transmitted to the box support ears through the front tooling frame and the rear tooling frame, which is convenient for simulating the actual force conditions, reducing the generation of redundant component forces, and achieving the purpose of accurately controlling the simulated force.

[0008] Furthermore, the front tooling frame includes a front crossbeam, a front side beam and a front connecting rod. The front crossbeam is rotatably connected to the first force load, and the front crossbeam is arranged parallel to the box body. Two front side beams are provided, and the two front side beams are respectively arranged on both sides of the box body. One end of each front side beam is fixedly connected to the front crossbeam, and the other end of the front crossbeam is rotatably connected to the two first groups of box body support ears. Two front connecting rods are provided, and the two front connecting rods are respectively arranged on both sides of the box body. One end of the front connecting rod is rotatably connected to the front crossbeam, and the other end of the front connecting rod is rotatably connected to the second group of box body support ears.

[0009] Through the above-mentioned improved technical solution, when the first force load applies force to the front tooling frame, the first force load is transferred to the front cross beam, and the load is transferred to both sides through the front cross beam. The front cross beam transfers part of the load to the front side beam, and the front side beam transfers the load to the first group of box support ears through the rotating shaft of the rotation connection, and the front cross beam transfers part of the load to the front connecting rod, and the front connecting rod transfers it to the second group of box support ears through the rotating shaft. The front tooling frame has a simple structure and generates less component force when transferring the load.

[0010] Furthermore, the front cross beam includes an I-beam, a reinforcement plate and a sealing plate. A plurality of reinforcement plates are provided, and the plurality of reinforcement plates are divided into two groups. The two groups of reinforcement plates are respectively located in two grooves of the I-beam. Each group of reinforcement plates is evenly distributed in a straight line along the length direction of the I-beam. Each reinforcement plate is fixedly connected to the I-beam. The sealing plate is located at the groove of the I-beam, and the sealing plate is fixedly connected to the I-beam and the reinforcement plates in the grooves.

[0011] Through the above-mentioned improved technical solution, since the first force load is located in the middle position of the front crossbeam, the crossbeam is prone to bending and deformation. In order to resist the bending moment, the crossbeam is set to an I-beam, and several reinforcing plates are set in the grooves on both sides of the I-beam to strengthen the strength of the I-beam. A sealing plate is set at the groove to fix the I-beam and the reinforcing plate to further enhance the overall strength of the front crossbeam.

[0012] Furthermore, a plurality of support rods are arranged between the two front side beams, and two ends of each support rod are respectively fixedly connected to the two front side beams.

[0013] Through the above-mentioned improved technical solution, since the two front side beams are long and under pressure for a long time, a support rod is arranged between the two side beams, and the support rod is used to enhance the lateral supporting force between the two front side beams and reduce the lateral deformation of the two front side beams.

[0014] Furthermore, the front cross beam is fixedly connected to a front stress-bearing support ear, the front stress-bearing support ear is rotationally connected to the first force load, the front stress-bearing support ear is a double-ear support ear, a connecting plate is provided between the two ears of the front stress-bearing support ear, and the connecting plate is fixedly connected to both ears.

[0015] Through the above-mentioned improved technical solution, since the load direction is not perpendicular to the cross-section of the front beam, and the front stress-bearing support ear is connected to the first force load, the front stress-bearing support ear is set as a double-ear support ear, and a connecting plate is set between the double-ear support ears to strengthen the front stress-bearing support ear and increase the strength of the front stress-bearing support ear.

[0016] Furthermore, each of the front connecting rods and each front side beam is fixedly connected to a front support ear at one end away from the front cross beam. The front support ear is a single-piece support ear, which is inserted into the box support ear. The rotating shaft passes through the front support ear and the box support ear, and the front support ear and the box support ear are both rotatably connected to the rotating shaft.

[0017] Through the above-mentioned improved technical solution, the front connecting rod and the front side beam are fixedly connected to a front support ear, and the front support ear is set to be a single-piece support ear, and the single-piece support ear is inserted into the box support ear. The front support ear and the box support ear are connected by rotating the rotating shaft to avoid contact with the rear support ear of the rear tooling frame to cause force transmission, thereby further accurately controlling the simulated force.

[0018] Furthermore, the rear workholding frame includes a rear cross beam, a rear side beam and a rear connecting rod, the rear cross beam is rotatably connected to the second force load, the rear cross beam is arranged parallel to the box body, two rear side beams are provided, and the two rear side beams are respectively arranged on both sides of the box body, one end of each rear side beam is fixedly connected to the rear cross beam, and the other end of the rear side beam is respectively rotatably connected to the two first groups of box body support ears, and two rear connecting rods are provided, and the two rear connecting rods are respectively arranged on both sides of the box body, one end of the rear connecting rod is rotatably connected to the rear cross beam, and the other end of the rear connecting rod is rotatably connected to the second group of box body support ears.

[0019] Through the above-mentioned improved technical solution, when the second force load applies force to the rear tooling frame, when the second force load is transmitted to the rear cross beam, the load is transmitted to both sides through the rear cross beam, and the rear cross beam transmits part of the load to the rear side beam, and the rear side beam transmits the load to the first group of box support ears through the rotating shaft of the rotation connection, and the rear cross beam transmits part of the load to the rear connecting rod, and the rear connecting rod transmits the load to the second group of box support ears through the rotating shaft. The rear tooling frame has a simple structure and generates less component force when transferring the load.

[0020] Furthermore, each of the rear connecting rods and each rear side beam is fixedly connected to a rear support ear at one end away from the cross beam, the rear support ear is a double-piece support ear, the box support ear is located inside the rear support ear, the rotating shaft passes through the rear support ear and the box support ear, and the rear support ear and the box support ear are both rotatably connected to the rotating shaft.

[0021] Through the above-mentioned improved technical solution, the rear connecting rod and the rear side beam are fixedly connected to a rear support ear, and the rear support ear is set as a double-piece support ear, and the double-piece support ear is placed on both sides of the box support ear, so that the box support ear is located inside the double-piece support ear of the rear support ear, and the rear support ear and the box support ear are connected by rotating the rotating shaft to avoid contact with the front support ear of the front workholding frame to cause force transmission, thereby further accurately controlling the simulated force.

[0022] The beneficial effects of the present invention are:

[0023] Compared with the prior art, the present invention provides a mechanical test fixture for simulating the stress of multiple ears. The fixture is set as a front fixture and a rear fixture, so that the front fixture and the rear fixture are separated, and different loads are applied to the front fixture and the rear fixture, respectively. Moreover, since the front construction frame and the rear construction frame are rotatably connected to the box ears, the force load can be directly transmitted to the box ears through the front fixture and the rear fixture, which is convenient for simulating the actual stress conditions and reducing the generation of redundant component forces, thereby achieving the purpose of accurately controlling the simulated stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the box being subjected to unilateral force.

[0025] Figure 2 This is a schematic diagram of the structure of a mechanical test fixture that simulates the stress on multiple ears.

[0026] Figure 3 It is a structural schematic diagram of the front tooling frame.

[0027] Figure 4 This is a schematic diagram of the structure of the front crossbeam.

[0028] Figure 5 It is a structural schematic diagram of the rear tooling frame.

[0029] In the figure,

[0030] 1. Front tooling frame; 11. Front cross beam; 111. I-beam; 112. Reinforcement plate; 113. Sealing plate; 12. Front side beam; 121. Support rod; 13. Front connecting rod; 14. Front support ear; 2. Rear tooling frame; 21. Rear cross beam; 22. Rear side beam; 23. Rear connecting rod; 24. Rear support ear; 3. Box support ear; 31. First group of box support ears; 32. Second group of box support ears; 4. Front force-bearing support ear; 41. Connecting plate; 5. Rotary connection device; 51. Rotary connection double support ears; 52. Rotary connection single support ear; 53. Rotary connection shaft; 6. Rotary shaft; 7. Rear force-bearing support ear. DETAILED DESCRIPTION

[0031] The following is a description of the drawings Figure 2-Figure 5 The technical solution of a mechanical test fixture for simulating multiple lug stress provided by the present invention is explained and illustrated in detail. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] Figure 2 The present embodiment specifically discloses a mechanical test fixture frame for simulating the stress on multiple ears, the mechanical test fixture frame comprising a front fixture frame 1 and a rear fixture frame 2, the front fixture frame 1 and the four box ears 3 are all rotatably connected via a rotating shaft 6, the end of the front fixture frame 1 away from the box ears 3 is rotatably connected to a first force load, the rear fixture frame 2 and the four box ears 3 are also rotatably connected via a rotating shaft 6, the end of the rear fixture frame 2 away from the box ears 3 is rotatably connected to a second force load. When using the fixture frame, first move the front fixture frame 1 and rotate them to connect with the four box ears 3, then move the rear fixture frame 2 and rotate them to connect with the four box ears 3, then connect the first force load to the front fixture frame 1, and then connect the second force load to the rear fixture frame 2, then start the first force load to apply load to the front fixture frame 1, and the load is transmitted to the four box ears 3 through the front fixture frame 1, and then start the second force load, and the second force load is transmitted to the four box ears 3 through the rear fixture frame 2, so as to simulate the real force condition, reduce the generation of redundant force components, and achieve the purpose of accurately controlling the simulated force.

[0033] Reference Figure 1 and Figure 2The front tooling frame 1 includes a front crossbeam 11, a front side beam 12 and a front connecting rod 13. The front crossbeam 11 is arranged parallel to the box body. The front crossbeam 11 is fixedly connected with a front force-bearing ear 4. The front force-bearing ear 4 is located in the middle of the front crossbeam 11. The front force-bearing ear 4 is rotatably connected to the first force load. The front force-bearing ear 4 is a double-ear plate ear. A connecting plate 41 is arranged between the two ears of the front force-bearing ear 4. The connecting plate 41 is fixedly connected to the two ears; there are two front side beams 12, which are respectively arranged on both sides of the box body, one end of each front side beam 12 is fixedly connected to the front crossbeam 11, and the other end of each front side beam 12 is fixedly connected to a front ear 14. The two front side beams 12 A plurality of support rods 121 are arranged between them. In this embodiment, two support rods 121 are arranged, and the two support rods 121 are arranged in parallel. The two ends of each support rod 121 are fixedly connected to the two front side beams 12 respectively; two front connecting rods 13 are provided, and the two front connecting rods 13 are respectively arranged on both sides of the box body, one end of each front connecting rod 13 is rotatably connected to the front cross beam 11 through a rotating connection device 5, and the other end of the front connecting rod 13 is also fixedly connected to a front support ear 14, the front support ear 14 is a single-piece support ear, and the front support ear 14 is inserted into the double-piece support ear of the box body support ear 3, the rotating shaft 6 passes through the front support ear 14 and the box body support ear 3, and the front support ear 14 and the box body support ear 3 are both rotatably connected to the rotating shaft 6.

[0034] When the front tooling frame 1 is used, the first force load is applied to the front cross beam 11 through the front force-bearing lug 4, and the first force load is transmitted to both sides through the front cross beam 11. The front cross beam 11 transmits part of the load to the front side beam 12, and the front side beam 12 transmits the load to the first group of box body lugs 31 through the rotating shaft 6 connected by rotation. The front cross beam 11 transmits part of the load to the front connecting rod 13 through the rotating connection device 5, and the front connecting rod 13 transmits the load to the second group of box body lugs 32 through the rotating shaft 6. The front tooling frame 1 has a simple structure, which is convenient for analyzing the transfer of loads, and less component force is generated when transferring loads.

[0035] Reference Figure 3 The front cross beam 11 includes an I-beam 111, a reinforcing plate 112 and a sealing plate 113. There are several reinforcing plates 112, which are divided into two groups. The two groups of reinforcing plates 112 are respectively located in two grooves of the I-beam 111. Each group of reinforcing plates 112 is evenly distributed in a straight line along the length direction of the I-beam 111. Each reinforcing plate 112 is fixedly connected to the I-beam 111. There are two sealing plates 113, which are respectively located at the notches of the two grooves of the I-beam 111. The sealing plates 113 are fixedly connected to the I-beam 111 and each reinforcing plate 112 in the groove. Since the first applied force load is located in the middle position of the front cross beam 11, the cross beam is easy to bend and deform, so the reinforcing plates 112 and the sealing plates 113 are used to enhance the overall strength of the front cross beam 11.

[0036] Reference Figure 4 The rear tooling frame 2 includes a rear crossbeam 21, a rear side beam 22 and a rear connecting rod 23. The rear crossbeam 21 is arranged in parallel with the front crossbeam 11. The rear crossbeam 21 and the front crossbeam 11 adopt the same structure. The rear crossbeam 21 is fixedly connected with a rear force-bearing ear 7. The rear force-bearing ear 7 is located in the middle of the rear crossbeam 21. The rear force-bearing ear 7 and the front force-bearing ear 4 adopt the same structure. The rear force-bearing ear 7 is rotatably connected to the second force load; there are two rear side beams 22, which are respectively arranged on both sides of the box body, and one end of each rear side beam 22 is fixedly connected to the rear crossbeam 21. The other end of each rear connecting rod 22 is fixedly connected to a rear support ear 24, one end of each rear connecting rod 23 is also rotatably connected to the rear cross beam 21 through a rotating connection device 5, and the other end of the rear connecting rod 23 is also fixedly connected to a rear support ear 24, the rear support ear 24 is a double-piece support ear, the box support ear 3 is located in the rear support ear 24, and the rotating shaft 6 passes through an ear piece of the rear support ear 24, an ear piece of the box support ear 3, the front support ear 14, the other ear piece of the box support ear 3 and the other ear piece of the rear support ear 24 in sequence, and the front support ear 14, the rear support ear 24 and the box support ear 3 are all rotatably connected to the rotating shaft 6.

[0037] When the second force load is transferred to the rear cross beam 21, the load is transferred to both sides through the rear cross beam 21, the rear cross beam 21 transfers part of the load to the rear side beam 22, the rear side beam 22 transfers the load to the first group of box support ears 31 through the rotating shaft 6 connected by rotation, the rear cross beam 21 transfers part of the load to the rear connecting rod 23 through the rotating device, and the rear connecting rod 23 transfers the load to the second group of box support ears 32 through the rotating shaft 6.

[0038] Reference Figure 2 and Figure 4 The rotating connection device 5 includes a rotating connection double ear 51, a rotating connection single ear 52 and a rotating connection shaft 53. The front cross beam 11 and the rear cross beam 21 are fixedly connected to the two rotating connection double ears 51. The ends of the front connecting rod 13 and the rear connecting rod 23 away from the box body ear 3 are fixedly connected to a rotating connection single ear 52. The rotating connection single ear 52 is inserted into the rotating connection double ears 51. One end of the rotating connection shaft 53 passes through an ear piece of the rotating connection double ears 51, the rotating connection single ear 52, and the other ear piece of the rotating connection double ears 51 in sequence. The rotating connection double ears 51 and the rotating connection single ear 52 are both rotatably connected to the rotating connection shaft 53.

[0039] The implementation principle of a mechanical test fixture for simulating the stress of multiple ears in an embodiment of the present invention is as follows: when using the fixture, first move the front fixture 1 to drive the front side beam 12 and the front connecting rod 13 close to the box body, so that the two front side beams 12 and the two front connecting rods 13 are respectively located on both sides of the box body, and the front side beams 12 and the front connecting rods 13 drive the front ears 14 to be inserted into the box body ears 3; then move the rear fixture 2, and the rear fixture 2 drives the side beams and the rear connecting rod 23 close to the box body, so that the two rear side beams 22 and The two rear connecting rods 23 are respectively located on both sides of the box body, and the rear side beam 22 and the rear connecting rod 23 drive the rear support ear 24 to be inserted into the outer side of the box support ear 3, and then the rotating shaft 6 is moved to sequentially pass through an ear piece of the rear support ear 24, an ear piece of the box support ear 3, the front support ear 14, another ear piece of the box support ear 3 and another ear piece of the rear support ear 24, so as to rotationally connect the first force load with the front force support ear 4, and then rotationally connect the second force load with the rear force support ear 7 to complete the installation of the tooling frame.

[0040] The first force load is applied to the front cross beam 11 through the front force lug 4, and the first force load is transmitted to both sides through the front cross beam 11, and the front cross beam 11 transmits part of the load to the front side beam 12, and the front side beam 12 transmits the load to the first group of box body lugs 31 through the rotating shaft 6 connected by rotation, and the front cross beam 11 transmits part of the load to the front connecting rod 13 through the rotating connection device 5, and the front connecting rod 13 transmits the load to the second group of box body lugs 32 through the rotating shaft 6; when the second force load is transmitted to the rear cross beam 21, the load is transmitted to both sides through the rear cross beam 21, and the rear cross beam 21 transmits part of the load to the front side beam 12, and the front side beam 12 transmits part of the load to the first group of box body lugs 31 through the rotating connection device 5. The load is transferred to the rear side beam 22, and the rear side beam 22 transfers the load to the first group of box support ears 31 through the rotating shaft 6 connected by rotation. The rear cross beam 21 transfers part of the load to the rear connecting rod 23 through the rotating connection device 5, and the rear connecting rod 23 transfers the load to the second group of box support ears 32 through the rotating shaft 6. In summary, through the above steps, two different force loads are directly transferred to each box support ear 3 through the front tooling frame 1 and the rear tooling frame 2 respectively, which is convenient for simulating the actual force condition, reducing the generation of redundant component force, and achieving the purpose of accurately controlling the simulated force.

[0041] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical test fixture for simulating the stress of multiple ears, characterized by: The mechanical test fixture frame comprises a front fixture frame (1) and a rear fixture frame (2) connected to the box support ears (3); the front fixture frame (1) and the four box support ears (3) are all rotationally connected via a rotation shaft (6); the front fixture frame (1) is rotationally connected to a first force application load; the rear fixture frame (2) and the four box support ears (3) are also rotationally connected via the rotation shaft (6); and the rear fixture frame (2) is rotationally connected to a second force application load; The front tooling frame (1) comprises a front crossbeam (11), a front side beam (12) and a front connecting rod (13); the front crossbeam (11) is rotatably connected to the first force load; the front crossbeam (11) is arranged parallel to the box body; two front side beams (12) are arranged; the two front side beams (12) are arranged on both sides of the box body; one end of each front side beam (12) is fixedly connected to the front crossbeam (11); the other end of the front side beam (12) is rotatably connected to two first groups of box body support ears (31); two front connecting rods (13) are arranged; the two front connecting rods (13) are arranged on both sides of the box body; one end of the front connecting rod (13) is rotatably connected to the front crossbeam (11); the other end of the front connecting rod (13) is rotatably connected to the second group of box body support ears (32); The rear tooling frame (2) comprises a rear crossbeam (21), a rear side beam (22) and a rear connecting rod (23); the rear crossbeam (21) is rotatably connected to the second force load; the rear crossbeam (21) is arranged parallel to the box body; two rear side beams (22) are arranged; the two rear side beams (22) are arranged on both sides of the box body; one end of each rear side beam (22) is fixedly connected to the rear crossbeam (21); the other end of the rear side beam (22) is rotatably connected to two first groups of box body support ears (31); two rear connecting rods (23) are arranged; the two rear connecting rods (23) are arranged on both sides of the box body; one end of the rear connecting rod (23) is rotatably connected to the rear crossbeam (21); the other end of the rear connecting rod (23) is rotatably connected to the second group of box body support ears (32).

2. The mechanical test fixture for simulating multiple lug stresses according to claim 1, characterized in that: The front cross beam (11) comprises an I-beam (111), a reinforcing plate (112) and a sealing plate (113). A plurality of reinforcing plates (112) are provided. The plurality of reinforcing plates (112) are divided into two groups. The two groups of reinforcing plates (112) are respectively located in two grooves of the I-beam (111). Each group of reinforcing plates (112) is evenly distributed in a straight line along the length direction of the I-beam (111). Each reinforcing plate (112) is fixedly connected to the I-beam (111). The sealing plate (113) is located at the notch of the I-beam (111). The sealing plate (113) is fixedly connected to the I-beam (111) and the reinforcing plates (112) in the grooves.

3. The mechanical test fixture for simulating multiple lug stresses according to claim 1, characterized in that: A plurality of support rods (121) are arranged between the two front side beams (12), and two ends of each support rod (121) are respectively fixedly connected to the two front side beams (12).

4. The mechanical test fixture for simulating multiple lug stresses according to claim 1, characterized in that: The front cross beam (11) is fixedly connected with a front force-bearing support ear (4), the front force-bearing support ear (4) is rotatably connected to the first force-applying load, the front force-bearing support ear (4) is a double-ear plate support ear, a connecting plate (41) is arranged between the two ear plates of the front force-bearing support ear (4), and the connecting plate (41) is fixedly connected to both ear plates.

5. The mechanical test fixture for simulating multiple lug stresses according to claim 1, characterized in that: Each of the front connecting rods (13) and each of the front side beams (12) is fixedly connected to a front support ear (14) at one end away from the front cross beam (11); the front support ear (14) is a single-piece support ear, the front support ear (14) is inserted into the box support ear (3), the rotating shaft (6) passes through the front support ear (14) and the box support ear (3), and the front support ear (14) and the box support ear (3) are both rotatably connected to the rotating shaft (6).

6. The mechanical test fixture for simulating multiple lug stresses according to claim 1, characterized in that: Each of the rear connecting rods (23) and each of the rear side beams (22) is fixedly connected to a rear support ear (24) at one end away from the cross beam. The rear support ear (24) is a double-piece support ear. The box support ear (3) is located inside the rear support ear (24). The rotating shaft (6) passes through the rear support ear (24) and the box support ear (3). The rear support ear (24) and the box support ear (3) are both rotatably connected to the rotating shaft (6).

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