A test bench for simulating the torsional working conditions of an engineering vehicle frame

Abstract

The present invention discloses a test bench for simulating the torsional working conditions of an engineering vehicle frame, comprising a base, a front fixing portion, a rear fixing portion, a front loading portion, and a rear loading portion; the front fixing portion comprises a support seat, a torsion arm, and two front alternative leaf springs; the support seat is mounted on the base; the torsion arm comprises a connected rotating section and a transmission section; the middle portion of the rotating section is rotatably mounted on the support seat, and its two ends are respectively located on opposite sides of its axial direction; the two front alternative leaf springs are respectively connected to the two ends of the rotating section; the rear fixing portion is mounted on the base and is spaced apart from the support seat along the axial direction of the rotating section; the front loading portion is arranged on the base and is transmission-connected to the transmission section; the rear loading portion is arranged on the base and is used to apply a load vertically to the frame. This solution can simulate the torsional deformation caused by the torsional load borne by the actual vehicle frame; it can also simulate the load borne by the frame when carrying cargo, and can replace the whole vehicle test to conduct reliability and durability tests on the engineering vehicle frame, and has strong practicality and promotion value.

Description

Technical Field

[0001] The invention relates to the technical field of test equipment for frame torsion working conditions, and in particular to a test bench for simulating the torsion working conditions of an engineering vehicle frame. Background Art

[0002] Engineering vehicles are the backbone of construction projects, primarily used for transportation, excavation, and emergency repairs. For example, patent CN204472659U discloses an electric engineering vehicle that integrates a generator, lift light, tool rack, and other tools within its chassis. This vehicle can be used as both an emergency repair vehicle and a power supply vehicle. It can also be used as a cargo truck after all the tool racks are removed, meeting the needs of on-site operations such as power engineering operations, accident repairs, and disaster relief.

[0003] However, due to the complex usage scenarios of engineering vehicles, which often travel on bumpy and uneven roads, they can easily cause severe frame distortion and deformation, leading to fatigue cracking. Therefore, the design and development phase requires greater attention to frame quality. Therefore, a frame torsional test bench is urgently needed to conduct torsional fatigue testing and stiffness testing to prevent products with design defects from entering the market. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a test bench that simulates the torsional working conditions of an engineering vehicle frame, thereby solving the technical problem in the prior art that a frame torsional working condition test bench is urgently needed to perform torsional fatigue tests and stiffness tests, thereby preventing products with design defects from entering the market.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The present invention provides a test bench for simulating the torsion working condition of an engineering vehicle frame, comprising:

[0007] base;

[0008] The front fixing portion includes a support base, a torsion arm, and two front replacement leaf springs. The support base is mounted on the base. The torsion arm includes a rotating section and a transmission section connected to each other. The middle portion of the rotating section is rotatably mounted on the support base, and its two ends are respectively located on opposite sides of its axial direction. The two front replacement leaf springs are respectively connected to the two ends of the rotating section.

[0009] a rear fixing portion, mounted on the base and spaced apart from the support seat along the axial direction of the rotating section;

[0010] a front loading portion, provided on the base and in transmission connection with the transmission section, for applying a load to the transmission section to twist the two ends of the rotating section; and

[0011] The rear loading part is arranged on the base and is used for applying a load vertically to the vehicle frame.

[0012] In some embodiments, the front fixing portion further includes two connecting supports, the two connecting supports being respectively provided at both ends of the rotating section, and each of the connecting supports being capable of rotating relative to the rotating section about a first direction, the first direction being consistent with an arrangement direction of the two connecting supports;

[0013] Wherein, the two front replacement leaf springs are respectively installed on the two connecting supports.

[0014] In some embodiments, each of the connecting supports is movable relative to the rotating section along the first direction, so that the distance between the two connecting supports is adjustable;

[0015] The front fixing portion also includes two locking portions, which are respectively arranged between the rotating section and the two connecting supports, and are used to limit the movement of the connecting supports relative to the rotating section along the first direction when the distance between the two connecting supports is adjusted to a preset value.

[0016] In some embodiments, each end of the rotating section is provided with two sets of fixing screw holes, and the two sets of fixing screw holes at each end are spaced apart along the first direction, and each connecting support is provided with a mounting channel for the rotating section to pass through, and is located between the corresponding two sets of fixing screw holes;

[0017] The locking portion includes two groups of adjustment blocks and locking bolts, and the two groups of adjustment blocks and locking bolts correspond to the two groups of fixing screw holes at each end of the rotating section. The adjustment block is provided with a connecting groove along the first direction, and the locking bolt is passed through the connecting groove and screwed into the corresponding fixing screw hole, so that the adjustment block can move relative to the rotating section along the first direction and limit the connecting support.

[0018] In some embodiments, each group of fixing screw holes is provided with multiple intervals, each adjustment block is provided with multiple connecting grooves corresponding to the fixing screw holes, and multiple locking bolts are provided, and each locking bolt is arranged in the corresponding connecting groove and the fixing screw hole.

[0019] In some embodiments, the front fixing portion further comprises:

[0020] Two groups of fixing seats, each of which is provided on the two front substitute leaf springs, with each group of fixing seats having two members. The two fixing seats in the same group are spaced apart from each other on the corresponding front substitute leaf springs and can move closer to or further away from each other, and are used to fix the lateral sides of one end of the frame; and

[0021] Two groups of limiting parts correspond to the two groups of fixing seats respectively. Each group has two limiting parts, and each limiting part is arranged between the front replacement leaf spring and the corresponding fixing seat to limit the two fixing seats from approaching or moving away from each other when the distance between the two fixing seats in the same group is adjusted to a preset value.

[0022] In some embodiments, each of the front replacement leaf springs is provided with a leaf spring T-slot along the axial direction of the rotating section, and each of the fixing seats is provided with a through hole communicating with the leaf spring T-slot;

[0023] The limiting portion includes a leaf spring T-bolt and an adjusting nut. The T-head of the leaf spring T-bolt is inserted into the leaf spring T-slot, and its threaded end extends out of the leaf spring T-slot and is inserted into the through hole. The adjusting nut is threaded on the threaded end of the leaf spring T-bolt extending out of the through hole.

[0024] In some embodiments, the rear fixing portion includes a balancing shaft hub assembly, two groups of support columns and two rear replacement leaf springs. The two groups of support columns are installed on the base and are spaced apart from the support seat along the axial direction of the rotating section. The two rear replacement leaf springs are respectively installed on the upper ends of the two groups of support columns, and the balancing shaft hub assembly is mounted between the two rear replacement leaf springs.

[0025] In some embodiments, the support seat, the rear fixing portion, the front loading portion, and the rear loading portion are respectively adjustable at positions of the base in the axial direction of the rotating section.

[0026] In some embodiments, the front loading portion includes a first gantry and a first actuator, wherein the first gantry is mounted on the base and corresponds to the support seat, and the first actuator is mounted on the first gantry, and its telescopic arm is rotatably connected to the transmission section;

[0027] The rear loading part includes a second gantry, a third gantry, a second actuator and a third actuator. The second gantry and the third gantry are installed on the base and are arranged at intervals along the axial direction of the rotating section and are located between the support seat and the rear fixed part. The second actuator is installed on the second gantry, and the third actuator is installed on the third gantry. The telescopic arms of the second actuator and the third actuator are respectively pointed vertically to the vehicle frame.

[0028] In some embodiments, the base is provided with a base T-slot along the axial direction of the rotating section, and the support column and the support seat are respectively provided with limiting holes corresponding to the base T-slot;

[0029] The test bench simulating the torsional working condition of the engineering vehicle frame also includes a base T-bolt and a limit nut. The T-head of the base T-bolt is passed through the base T-slot, and its threaded end extends out of the base T-slot and is passed through the limit hole. The limit nut is threaded on the threaded end of the base T-bolt extending out of the limit hole.

[0030] Compared to the prior art, the test bench provided by the present invention simulates the torsional working conditions of an engineering vehicle frame. When testing the frame, two front replacement leaf springs are fixed to the lateral sides of one end of the frame, and the rear fixing portion is fixed to the rear end of the frame. A load is then applied to the transmission section via the front loading portion, driving the transmission section to rotate the rotating section about its axis. This allows the two front replacement leaf springs installed at both ends of the rotating section to rotate synchronously about the axis of the rotating section, applying opposite forces to the lateral sides of the front end of the frame, thereby simulating the torsional load on the front end of the frame. This facilitates the collection of frame torsional data by testers and simulates the torsional deformation caused by the torsional load on an actual vehicle frame. Simultaneously, the rear loading portion can apply a vertical load to the frame to simulate the load on the frame when carrying cargo, making it easier for operators to understand the impact of heavy cargo on the frame bending. In this way, this solution can replace full vehicle testing to conduct reliability and durability testing of engineering vehicle frames, and has strong practicality and promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structure of a test bench and a frame for simulating the torsional working condition of an engineering vehicle frame provided by an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 The test bench simulating the torsional working condition of the engineering vehicle frame and the structural diagram of the frame from another angle;

[0033] Figure 3 yes Figure 1 Schematic diagram of the structure of the mid-front fixing part;

[0034] Figure 4 yes Figure 3 A partial enlarged view of the mid-front fixed part;

[0035] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle and rear fixing part.

[0036] Description of reference numerals:

[0037] 1. Base; 1a. Base T-slot; 2. Front fixing part; 21. Support seat; 22. Torsion arm; 221. Rotation section; 222. Transmission section; 23. Front alternative leaf spring; 23a. Leaf spring T-slot; 24. Connecting support; 25. Locking part; 251. Adjusting block; 251a. Connecting slot; 252. Locking bolt; 26. Fixing seat; 26a. Through hole; 3. Rear fixing part; 31. Balance shaft hub assembly; 32. Support column; 33. Rear alternative leaf spring; 34. Leaf spring cover; 4. Front loading part; 41. First gantry; 42. First actuator; 5. Rear loading part; 51. Second gantry; 52. Third gantry; 53. Second actuator; 54. Third actuator; 6. Base T-bolt; 7. Limit nut; 8. Frame. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In order to solve the technical problem in the prior art that a frame torsional working condition test bench is urgently needed to conduct torsional fatigue tests and stiffness tests, and to prevent products with design defects from entering the market, the present invention provides a test bench that simulates the torsional working condition of an engineering vehicle frame. It can simulate the torsional deformation problem caused by the torsional load borne by the actual vehicle frame, and can apply a load to make the frame as close as possible to the load generated by the cargo, so as to clarify the influence of heavy objects in the cargo box on the bending of the frame.

[0040] See also Figures 1 to 3 , Figures 1 to 3 2 and 3. The present invention provides a test bench for simulating the torsional working condition of an engineering vehicle frame in accordance with an embodiment of the present invention. The test bench for simulating the torsional working condition of an engineering vehicle frame includes a base 1, a front fixing part 2, a rear fixing part 3, a front loading part 4 and a rear loading part 5. The front fixing part 2 includes a support seat 21, a torsion arm 22 and two front alternative leaf springs 23. The support seat 21 is mounted on the base 1. The torsion arm 22 includes a connected rotating section 221 and a transmission section 222. The middle part of the rotating section 221 is rotatably mounted on the support seat 21, and its two ends are respectively located on opposite sides of its axial direction. The two front alternative leaf springs 23 are respectively connected to the two ends of the rotating section 221. The rear fixing part 3 is mounted on the base 1 and is spaced apart from the support seat 21 along the axial direction of the rotating section 221. The front loading part 4 is provided on the base 1 and is transmission-connected to the transmission section 222 for applying a load to the transmission section 222 to twist the two ends of the rotating section 221. The rear loading part 5 is provided on the base 1 for applying a load vertically to the frame 8.

[0041] The test bench provided by the present invention, which simulates the torsional working conditions of an engineering vehicle frame, fixes two front alternative leaf springs 23 to the lateral sides of one end of the frame 8, and fixes the rear fixing portion 3 to the rear end of the frame 8. A load is then applied to the transmission section 222 via the front loading portion 4, driving the transmission section 222 to rotate the rotating section 221 about its axis. This allows the two front alternative leaf springs 23 mounted at both ends of the rotating section 221 to rotate synchronously about the axis of the rotating section 221, applying opposite forces to the lateral sides of the front end of the frame 8. This simulates the torsional load on the front end of the frame 8, facilitating the collection of torsional data on the frame 8 and simulating the torsional deformation caused by the torsional load on the actual vehicle frame 8. Simultaneously, the rear loading portion 5 applies a vertical load to the frame 8 to simulate the load on the frame 8 when carrying cargo, allowing operators to understand the impact of heavy cargo on the bending of the frame 8. In this way, this solution can replace the whole vehicle test to carry out the reliability and durability test of the engineering vehicle frame 8, and has strong practicality and promotion value.

[0042] It should be noted that the test bench for simulating the torsional working conditions of an engineering vehicle frame also includes a controller and sensors. The controller is connected to the front loading unit 4 and the rear loading unit 5 to control their operation. The sensors are installed on the frame 8 to collect torsion and strain data of the frame 8 and transmit them to the controller.

[0043] Specifically, when the controller issues an instruction, the rear loading part 5 applies a vertical force to the frame 8, simulating the bending deformation of the frame 8 caused by the weight of the cargo in the cargo box, and the front loading part 4 causes torsional deformation of the frame 8. At this time, the load data and strain data of the frame 8 can be collected through the sensor and sent to the controller as feedback.

[0044] In one embodiment, the front fixing portion 2 further includes two connecting supports 24, which are respectively arranged at both ends of the rotating section 221, and each connecting support 24 can rotate around a first direction relative to the rotating section 221, and the first direction is consistent with the arrangement direction of the two connecting supports 24; wherein, the two front replacement leaf springs 23 are respectively installed on the two connecting supports 24.

[0045] In this embodiment, the front replacement leaf spring 23 is rotatably connected to the rotating section 221 via the connecting support 24, so that when the frame 8 bends in the longitudinal direction, the front replacement leaf spring 23 can rotate to a certain extent relative to the rotating section 221 along the longitudinal deformation direction, thereby preventing the frame 8 from being affected by the platform stiffness when deforming in the longitudinal direction, thereby further improving the simulation realism.

[0046] In one embodiment, each connecting support 24 can move along the first direction relative to the rotating section 221, so that the distance between the two connecting supports 24 is adjustable; the front fixing portion 2 also includes two locking portions 25, which are respectively arranged between the rotating section 221 and the two connecting supports 24, and are used to limit the movement of the connecting supports 24 along the first direction relative to the rotating section 221 when the distance between the two connecting supports 24 is adjusted to a preset value.

[0047] In this embodiment, the distance between the two connecting supports 24 can be adjusted, that is, the distance between the two front replacement leaf springs 23 can be adjusted according to actual needs to be applicable to various models of frames 8, thereby improving practicality.

[0048] In one embodiment, see Figure 3 and Figure 4 , each end of the rotating section 221 is respectively provided with two groups of fixing screw holes, and the two groups of fixing screw holes at each end are spaced apart along the first direction, and each connecting support 24 is provided with a mounting channel for the rotating section 221 to pass through, and is located between the corresponding two groups of fixing screw holes; the locking portion 25 includes two groups of adjusting blocks 251 and locking bolts 252, and the two groups of adjusting blocks 251 and locking bolts 252 correspond to the two groups of fixing screw holes at each end of the rotating section 221. The adjusting block 251 is provided with a connecting groove 251a along the first direction, and the locking bolt 252 passes through the connecting groove 251a and is screwed into the corresponding fixing screw hole, so that the adjusting block 251 can move relative to the rotating section 221 along the first direction and limit the connecting support 24.

[0049] In this embodiment, the connecting support 24 is sleeved on the rotating section 221 through the installation channel and is located between two adjacent groups of fixing screw holes. When the distance between the two connecting supports 24 is adjusted, the two adjustment blocks 251 on both sides of each connecting support 24 are driven close to the corresponding connecting support 24 until the adjustment block 251 is pressed against the adjacent connecting support 24, and then the locking bolt 252 is tightened to limit the connecting support 24. The structure is simple and reliable.

[0050] In one embodiment, each group of fixing screw holes is provided with multiple intervals, each adjustment block 251 has multiple connecting grooves 251a corresponding to the fixing screw holes, and multiple locking bolts 252 are provided, and each locking bolt 252 is arranged in the corresponding connecting groove 251a and fixing screw hole.

[0051] In this embodiment, each group of fixing screw holes is provided with multiple, and correspondingly, each adjustment block 251 is provided with multiple connecting slots 251a and locking bolts 252, respectively, to improve the stability of the adjustment block 251 in limiting the connection support 24. Specifically, in the example shown in the drawings, each group of fixing screw holes, each adjustment block 251 is provided with two connecting slots 251a, and each locking bolt 252.

[0052] In one embodiment, the front fixing portion 2 further includes two groups of fixing seats 26 and two groups of limiting portions; the two groups of fixing seats 26 are respectively arranged on the two front replacement leaf springs 23, and each group has two fixing seats 26, and the two fixing seats 26 in the same group are spaced apart and arranged on the corresponding front replacement leaf springs 23, and can approach and move away from each other, and are used to fix the lateral sides of one end of the frame 8; the two groups of limiting portions respectively correspond to the two groups of fixing seats 26, and each group has two limiting portions, and each limiting portion is arranged between the front replacement leaf spring 23 and the corresponding fixing seat 26, so as to limit the two fixing seats 26 from approaching and moving away from each other when the distance between the two fixing seats 26 in the same group is adjusted to a preset value.

[0053] In this embodiment, the fixed connection between the front alternative leaf spring 23 and the frame 8 is achieved by the fixing seat 26 on the front alternative leaf spring 23, and the distance between the two fixing seats 26 on each front alternative leaf spring 23 is set to be adjustable so that it can be applicable to frames 8 of more sizes, further improving practicality.

[0054] In one embodiment, each front replacement leaf spring 23 is provided with a leaf spring T-slot 23a along the axial direction of the rotating section 221, and each fixing seat 26 is provided with a through hole 26a connected to the leaf spring T-slot 23a; the limiting portion includes a leaf spring T-bolt and an adjusting nut, the T-head of the leaf spring T-bolt is passed through the leaf spring T-slot 23a, and its threaded end extends out of the leaf spring T-slot 23a and is passed through the through hole 26a, and the adjusting nut is threaded on the threaded end of the leaf spring T-bolt extending through the through hole 26a.

[0055] In this embodiment, when it is necessary to adjust the distance between two fixing frames in the same group, first loosen the adjusting nut, and then move the fixing seat 26 relative to the front replacement leaf spring 23 until the distance between the two fixing seats 26 in the same group is adjusted to a preset value, and then tighten the adjusting nut to limit the fixing seat 26. The structure is simple and reliable.

[0056] In one embodiment, see Figure 5 The rear fixing part 3 includes a balancing shaft hub assembly 31, two groups of support columns 32 and two rear replacement leaf springs 33. The two groups of support columns 32 are installed on the base 1 and are spaced apart from the support seat 21 along the axial direction of the rotating section 221. The two rear replacement leaf springs 33 are respectively installed on the upper ends of the two groups of support columns 32, and the balancing shaft hub assembly 31 is mounted between the two rear replacement leaf springs 33.

[0057] In this embodiment, the upper end surface of the support column 32 is provided with a bolt connection hole for fixing the rear replacement leaf spring 33, and fixing the rear replacement leaf spring 33 to the upper side of the support columns 32 at both ends. Specifically, the rear replacement leaf spring 33 and the outer leaf spring interface of the balancing bearing hub assembly are connected to the balancing bearing hub assembly through U-bolts and a leaf spring cover 34, and the balancing bearing hub assembly is fixed to the frame 8 through the inner frame 8 interface end. In some embodiments, the rear replacement leaf spring 33 is detachably fixed to the balancing bearing hub assembly in the same manner. In addition, it should be noted that in some embodiments, the front replacement leaf spring 23 and the rear replacement leaf spring 33 are detachably fixed to the frame 8 through screw connections.

[0058] In one embodiment, the positions of the support seat 21 , the rear fixing portion 3 , the front loading portion 4 and the rear loading portion 5 on the base 1 in the axial direction of the rotating section 221 are adjustable.

[0059] In this embodiment, the distances between the support seat 21, the rear fixing portion 3, the front loading portion 4 and the rear loading portion 5 are set to be adjustable, so as to be applicable to vehicle frames 8 of more sizes and improve versatility.

[0060] Specifically, in this solution, the base 1 is provided with a base T-slot 1a along the axial direction of the rotating section 221, and the bottoms of the supporting column 32, the supporting seat 21, and the first gantry 41, the second gantry 51 and the third gantry 52 described later are respectively provided with limiting holes corresponding to the base T-slot 1a; the test bench simulating the torsional working conditions of the engineering vehicle frame also includes multiple sets of base T-bolts 6 and limiting nuts 7, the T-head of the base T-bolt 6 is passed through the base T-slot 1a, and its threaded end extends out of the base T-slot 1a and is passed through the corresponding limiting hole, and the limiting nut 7 is screwed on the threaded end of the base T-bolt 6 extending out of the limiting hole to realize the distance adjustment between the above-mentioned mechanisms.

[0061] In one embodiment, the front loading part 4 includes a first gantry 41 and a first actuator 42. The first gantry 41 is installed on the base 1 and corresponds to the support seat 21. The first actuator 42 is installed on the first gantry 41, and its telescopic arm is rotatably connected to the transmission section 222; the rear loading part 5 includes a second gantry 51, a third gantry 52, a second actuator 53 and a third actuator 54. The second gantry 51 and the third gantry 52 are installed on the base 1 and are arranged at intervals along the axial direction of the rotating section 221 and are located between the support seat 21 and the rear fixing part 3. The second actuator 53 is installed on the second gantry 51, and the third actuator 54 is installed on the third gantry 52. ​​The telescopic arms of the second actuator 53 and the third actuator 54 are respectively pointed vertically toward the vehicle frame 8.

[0062] In this embodiment, the first actuator 42 solves the problem of not being able to accurately simulate the torsional deformation caused by the torsional load on the frame 8 of an actual vehicle. The second and third actuators 53 and 54 apply a load to the frame 8 that closely approximates the uniform load generated by the cargo, thus solving the problem of not being able to accurately simulate the effect of the heavy cargo on the load on the frame 8. The base of the first actuator 42 is rotatably connected to the first gantry 41.

[0063] In some embodiments, a rectangular coordinate system is established with the plane where the base 1 is located as a coordinate plane, the length direction of the frame 8 as the X-axis, the horizontal direction perpendicular to the length of the frame 8 as the Y-axis, and the horizontal direction perpendicular to the frame 8 as the Z-axis. The rotating section 221 of the torsion arm 22 can rotate around the X-axis.

[0064] It should be noted that the actuator is fixed to the corresponding gantry and is equipped with an actuator connecting plate for applying vertical force to the frame 8. This connecting plate is designed with a long slot and can be connected to the frame 8 beam via U-bolts. Multiple sets of connecting plates can be expanded, with different models to accommodate various models of frames 8, and corresponding quick-change mechanisms between the connecting plates and the actuator output end can be expanded.

[0065] It is understood that the bottom ends of both sides of the gantry are fixed to the base 1, and the actuator is provided with an actuator connecting plate for fixing the vehicle frame 8. Since the vehicle frame 8 is fixed via the actuator connecting plate on the actuator, the actuator is fixed via the gantry's crossbeam, and the gantry is fixed to the platform via the fixing base 26, thus forming a loading closed loop.

[0066] The steps for adjusting the distance between the front loading part 4 and the rear loading part 5 are as follows:

[0067] The relative distance between the first loading mechanism and the second loading mechanism is set to be adjustable to adapt to different sizes of the frame 8. The movement scheme is mainly implemented by the moving device of the gantry base 1, and the specific implementation steps are as follows:

[0068] 1. Use a hydraulic lift (≥5000Kg) to lift the base 1 of the single-side gantry by 10-20mm;

[0069] 2. Place a hand-cranked transport tank under the gantry, lower the temporary support hydraulic support, and the base 1 on both sides of the gantry is supported by four transport tanks;

[0070] 3. Use ratchet wrenches on both sides of the gantry to shake the transport tank at the same time to move the gantry to the new installation location;

[0071] 4. Use the hydraulic support (≥5000Kg) to lift the gantry base 1 on each side by 10b~20mm respectively;

[0072] 5. Take out the hand-cranked tank, lower the gantry to the iron floor working surface, and fix the gantry.

[0073] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail:

[0074] The telescopic arm of the first actuator 42 is rotatably connected to the transmission section 222 of the torsion arm 22, and two front replacement leaf springs 23 are spaced apart and connected to the lateral sides of the front end of the frame 8. The second actuator 53 is fixed to the upper wing surface in the middle of the frame 8, and the third actuator 54 is fixed to the upper wing surface at the rear of the frame 8. The controller controls the operation of the second and third actuators 54 to apply a vertical static load to the frame 8, simulating the bending effect of a heavy cargo box on the frame 8. The controller controls the operation of the first actuator 42 to apply a torsional dynamic load to the frame 8. Sensors collect torsion and strain data of the frame 8 and transmit them to the controller.

[0075] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A test bench for simulating the torsion working condition of an engineering vehicle frame, characterized in that: include: base; The front fixing portion includes a support base, a torsion arm, and two front replacement leaf springs. The support base is mounted on the base. The torsion arm includes a rotating section and a transmission section connected to each other. The middle portion of the rotating section is rotatably mounted on the support base, and its two ends are respectively located on opposite sides of its axial direction. The two front replacement leaf springs are respectively connected to the two ends of the rotating section. The front fixing portion further comprises: Two groups of fixing seats, each of which is provided on the two front substitute leaf springs, with each group of fixing seats having two members. The two fixing seats in the same group are spaced apart from each other on the corresponding front substitute leaf springs and can move closer to or further away from each other, and are used to fix the lateral sides of one end of the frame; and Two groups of limiting portions, corresponding to the two groups of fixing seats, respectively. Each group has two limiting portions, and each limiting portion is arranged between the front replacement leaf spring and the corresponding fixing seat, so as to limit the two fixing seats from approaching or moving away from each other when the distance between the two fixing seats in the same group is adjusted to a preset value. a rear fixing portion, mounted on the base and spaced apart from the support seat along the axial direction of the rotating section; The rear fixing portion includes a balancing shaft hub assembly, two groups of support columns and two rear replacement leaf springs. The two groups of support columns are installed on the base and are spaced apart from the support seat along the axial direction of the rotating section. The two rear replacement leaf springs are respectively installed on the upper ends of the two groups of support columns. The balancing shaft hub assembly is mounted between the two rear replacement leaf springs. a front loading portion, provided on the base and in transmission connection with the transmission section, for applying a load to the transmission section to twist the two ends of the rotating section; The front loading part includes a first gantry and a first actuator, wherein the first gantry is mounted on the base and corresponds to the support seat, and the first actuator is mounted on the first gantry, and its telescopic arm is rotatably connected to the transmission section; and a rear loading portion, provided on the base, for applying a load vertically to the frame; The rear loading part includes a second gantry, a third gantry, a second actuator and a third actuator. The second gantry and the third gantry are installed on the base and are arranged at intervals along the axial direction of the rotating section and are located between the support seat and the rear fixed part. The second actuator is installed on the second gantry, and the third actuator is installed on the third gantry. The telescopic arms of the second actuator and the third actuator are respectively pointed vertically to the vehicle frame.

2. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 1, characterized in that: The front fixing portion further includes two connecting supports, which are respectively provided at both ends of the rotating section, and each connecting support can rotate relative to the rotating section around a first direction, and the first direction is consistent with the arrangement direction of the two connecting supports; Wherein, the two front replacement leaf springs are respectively installed on the two connecting supports.

3. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 2, characterized in that: Each of the connecting supports is movable relative to the rotating section along the first direction, so that the distance between the two connecting supports is adjustable; The front fixing portion also includes two locking portions, which are respectively arranged between the rotating section and the two connecting supports, and are used to limit the movement of the connecting supports relative to the rotating section along the first direction when the distance between the two connecting supports is adjusted to a preset value.

4. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 3, characterized in that: Each end of the rotating section is provided with two sets of fixing screw holes, and the two sets of fixing screw holes at each end are spaced apart along the first direction. Each connecting support is provided with a mounting channel for the rotating section to pass through, and is located between the corresponding two sets of fixing screw holes. The locking portion includes two groups of adjustment blocks and locking bolts, and the two groups of adjustment blocks and locking bolts correspond to the two groups of fixing screw holes at each end of the rotating section. The adjustment block is provided with a connecting groove along the first direction, and the locking bolt is passed through the connecting groove and screwed into the corresponding fixing screw hole, so that the adjustment block can move relative to the rotating section along the first direction and limit the connecting support.

5. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 4, characterized in that: There are multiple fixing screw holes in each group at intervals, multiple connecting grooves on each adjustment block are corresponding to the fixing screw holes, and multiple locking bolts are provided, each locking bolt is arranged in the corresponding connecting groove and the fixing screw hole.

6. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 1, characterized in that: Each of the front replacement leaf springs is provided with a leaf spring T-shaped slot along the axial direction of the rotating section, and each of the fixing seats is provided with a through hole communicating with the leaf spring T-shaped slot; The limiting portion includes a leaf spring T-bolt and an adjusting nut. The T-head of the leaf spring T-bolt is inserted into the leaf spring T-slot, and its threaded end extends out of the leaf spring T-slot and is inserted into the through hole. The adjusting nut is threaded on the threaded end of the leaf spring T-bolt extending out of the through hole.

7. The test bench for simulating the torsion working condition of an engineering vehicle frame according to claim 1, characterized in that: The positions of the support seat, the rear fixing portion, the front loading portion, and the rear loading portion on the base in the axial direction of the rotating section are respectively adjustable.

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