Frame fatigue test equipment and test method

Abstract

The invention discloses a vehicle frame fatigue test device which comprises a vehicle frame fatigue test device base used for placing a vehicle frame. The first fixing unit is arranged on the base and used for being connected with the front end of a frame; the second fixing unit slides on the base and can be connected with a first fixing point and a second fixing point of a frame; the first fixing piece and the second fixing piece are arranged on the sliding plate, the first fixing piece comprises a lower sleeving plate and an upper sleeving plate which are provided with grooves respectively, and the upper sleeving plate and the lower sleeving plate are used for being connected with a frame in a sleeving mode after being combined. Through a triggering mechanism provided with a pressing block, a first pull rope and a first switch, when the rear axle is placed in place, the sliding base is automatically triggered, and the upper sleeving plate and the lower sleeving plate are driven to move oppositely till being accurately limited by the preset upper limiting block and the preset lower limiting block. The bolt does not need to be manually locked in the process, the clamping speed is high, the clamping stroke is fixed, too tight or too loose caused by human factors is avoided, and the clamping precision and consistency are extremely high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test equipment, and in particular to a frame fatigue test device. BACKGROUND

[0002] As the core bearing structure of bicycles, motorcycles and tricycles, the fatigue strength and durability of the frame directly relate to the safety and service life of the vehicle. Therefore, during the research and production process, the frame must be strictly subjected to fatigue tests to simulate the working conditions of long-term bearing of cyclic loads under real road conditions.

[0003] At present, common frame fatigue test devices usually use fixed clamps or manually adjustable clamps to constrain the frame. For the fixation of the rear part of the frame, especially the rear wheel shaft part, the prior art usually uses special clamps matched with specific frame models, or general clamps such as V-shaped blocks and clamps tightened by hand. These methods have the following obvious defects: low clamping efficiency and poor universality: special clamps can only be adapted to a single model, and the clamps need to be replaced as a whole when the frame is changed, which is costly and inefficient; and general clamps need to be manually adjusted and bolted every time, which is complicated to operate and difficult to maintain consistent pre-tightening force. SUMMARY

[0004] The present application provides a frame fatigue test device and test method to overcome the deficiencies in the prior art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a frame fatigue test device comprising a base for placing the frame; a first fixing unit arranged on the base for connecting the front end of the frame; a second fixing unit sliding on the base and connectable to the first fixed point and the second fixed point of the frame; and which comprises a sliding plate, and a first fixing member and a second fixing member on the sliding plate, the first fixing member comprising a lower sleeve plate and an upper sleeve plate separately provided with grooves, and the upper sleeve plate and the lower sleeve plate being combined to be sleeved with the frame.

[0006] In the above scheme, preferably, a control unit is arranged between the upper sleeve plate and the lower sleeve plate, the control unit further comprising a sliding base, a guide rod, and an upper sliding block and a lower sliding block arranged on the guide rod, the upper sliding block being connected with the upper sleeve plate, and the lower sliding block being fixedly connected with the lower sleeve plate, upper and lower limit blocks being arranged on the guide rod to limit the outer ends of the sliding blocks, so as to control the moving distance of the upper sleeve plate and the lower sleeve plate.

[0007] Preferably, in the above scheme, the first fixing point is the rear wheel shaft of the vehicle frame, the distance between the upper and lower limit blocks is the diameter of the rear wheel shaft, and the distance between the upper limit block and the upper sliding block and the distance between the lower limit block and the lower sliding block are the same.

[0008] Preferably, in the above scheme, the sliding base is provided with fixing blocks outside, the first pull rope is arranged between the fixing blocks, the two ends of the first pull rope are provided with pressing blocks, the pressing blocks are connected to the fixing blocks through the first springs, the first switch is arranged in the fixing blocks, and the upper and lower sliding blocks move towards each other after the pressing blocks are separated from the first switch.

[0009] Preferably, in the above scheme, a plurality of retractable blocks are arranged in the groove, the blocks are used to detect the installation of the rear wheel shaft, and the blocks are arranged in the upper and lower sleeve setting plates through the adjusting unit.

[0010] Preferably, in the above scheme, the upper and lower sleeve setting plates are provided with measuring units at corresponding positions, the measuring unit comprises a first inclined block arranged in the upper sleeve setting plate and a second inclined block arranged on the second sleeve setting plate, one side of the first inclined block is provided with a first placing groove, the first placing groove is arranged corresponding to the second inclined block, one side of the second inclined block is provided with a second placing groove, and the second placing groove is arranged corresponding to the first inclined block.

[0011] Preferably, in the above scheme, the measuring device further comprises a plurality of measuring tubes, the first channel of the measuring tube is provided with a first piston, the first piston is connected with the inclined block, the first piston is connected with the inclined block through a connecting rod, the second channel of the measuring tube is connected with an oil tank, the oil tank is provided with a second piston, the third channel of the measuring tube is connected with an adjusting pipe through a pipeline, the adjusting pipe is provided with a third piston, and the third piston is connected with the block. A first one-way valve is arranged between the first channel and the second channel, a second one-way valve is arranged between the third channel and the first channel, the third piston retracts when the first piston moves to the second channel, and the first piston and the third piston move to the outside of the measuring tube when the second piston moves to the measuring tube.

[0012] Preferably, in the above scheme, the second fixing member comprises a fixing plate, the fixing plate and the sliding plate are connected through a sliding shaft, the sliding shaft is fixed on the sliding plate, the fixing plate is movable on the sliding shaft, and the fixing plate is locked between the second fixing point and the connecting hole through the locking member.

[0013] A test method of a vehicle frame fatigue test equipment, S1, placing the vehicle frame to be tested on the base, and fixing and connecting the front end of the vehicle frame by using the first fixing unit; S2, sliding the sliding plate of the second fixing unit along the base, so that the upper sleeve plate and the lower sleeve plate in the first fixing part are located above and below the first fixing point of the vehicle frame respectively; The first fixing point is placed in the groove of the lower sleeve plate, and after the first fixing point triggers the first pull rope and the first switch, the upper sliding block and the lower sliding block are driven to move towards each other along the guide rod, thereby driving the upper sleeve plate and the lower sleeve plate to clamp the first fixing point together; After the first fixing point passes through the first inclined block and the second inclined block, the first inclined block and the second inclined block push the first piston in the measuring tube, and then drive the third piston in the adjusting tube through the cavity, so that the plurality of blocks in the groove are adaptively expanded and contracted until they are closely fitted with the surface profile of the first fixing point; S3, adjusting the position of the fixed plate in the second fixing part on the sliding shaft so that the connecting hole thereon is aligned with the second fixing point of the vehicle frame, and locking by using the locking part. The beneficial effects of the present application are: by setting the pressing block, the first pull rope and the first switch trigger mechanism, when the rear axle is placed in place, the sliding base is automatically triggered, the upper and lower sleeve plates are driven to move towards each other until they are accurately limited by the preset upper and lower limit blocks. This process does not require manual locking of the bolt, the clamping speed is fast, the clamping stroke is fixed, and the over-tightening or over-loosening caused by human factors is avoided, the clamping accuracy and consistency are extremely high. Through the hydraulic adjustment composed of the first inclined block, the second inclined block, the measuring tube, the oil tank, the adjusting tube and the one-way valve, the device can automatically sense the actual diameter of the rear axle. During clamping, the system drives the blocks to expand radially, so that the end faces of the plurality of blocks are uniformly fitted with the surface of the axle at the same time, which significantly improves the universality and test reliability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The figure is a cooperation diagram of the vehicle frame and the second fixing unit of the present application.

[0015] Figure 2 The figure is a perspective view of the second fixing unit of the present application.

[0016] Figure 3 The figure is a front view of the second fixing unit of the present application.

[0017] Figure 4 The figure is an internal structure diagram of the second fixing unit of the present application.

[0018] Figure 5 The figure is a side view of the measuring tube of the present application.

[0019] Figure 6 The figure is an internal cooperation diagram of the fixing block of the present application.

[0020] Figure 7 The figure is an enlarged view of A of the present application. Figure 6 ​

[0021] Figure 8 As a whole assembly drawing of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described in conjunction with the drawings and specific embodiments. Referring to the drawings, Figures 1-8 A frame fatigue test device and a test method thereof are used to simulate the dynamic load of the frame in actual use and to test the fatigue life. The frame needs to be tested in different positions of loading, such as frame horizontal loading, frame centroid position loading, and frame rear axle position loading, so the device needs to be able to adapt to the fixing points on the frame in different positions to achieve quick clamping and fixing.

[0023] The frame fatigue test device comprises a base 1, a first fixing unit 2 and a second fixing unit 3. The base 1 is the support foundation of the whole device, usually welded by solid section or plate, and the upper surface is flat to bear the frame to be tested. The base 1 is usually provided with guide rails to facilitate the sliding of other components.

[0024] The first fixing unit 2 is fixedly arranged at one end of the base 1 and used to connect and fix the front end of the frame, such as the head tube or the front fork mounting part.

[0025] The second fixing unit 3 is slidably arranged on the base 1 and used to connect two fixing points of the rear part of the frame. The second fixing unit 3 comprises a sliding plate 6, a first fixing member and a second fixing member arranged on the sliding plate 6. The second fixing member comprises a fixing plate 36, which is connected with the sliding plate through a sliding shaft 37 fixed on the sliding plate, and the fixing plate 36 is movable on the sliding shaft 37, and a locking member 38 is arranged between the second fixing point 5 and the connecting hole on the fixing plate 36 to lock them.

[0026] The first fixing point 4 is the rear wheel shaft, and the first fixing shaft is used to be sleeved on the rear wheel shaft for the frame rear axle position loading. The second fixing point 5 is located in the middle part of the frame, and after fixing the second fixing point 5, the frame horizontal loading can be realized. At the same time, the first fixing member and the second fixing member are arranged on the two sides of the sliding plate 6 to realize mutual influence of respective work.

[0027] Specifically, the sliding plate 6 at the bottom is matched with the guide rail on the base 1, and can be slid along the length direction of the base 1 by manual or linear module to adapt to different lengths of the frame. Two groups of vertical mounting plates are fixed on the sliding plate 6, and the two groups of mounting plates are connected by a plurality of transverse reinforcing rods to enhance the overall rigidity.

[0028] The first fixing member is used to connect the first fixing point 4 of the vehicle frame, and in this embodiment, the first fixing point 4 is the rear wheel shaft mounting portion of the vehicle frame. The first fixing member includes a lower sleeve plate 7 and an upper sleeve plate 8. A semicircular recess 9 is formed on the opposite surfaces of the lower sleeve plate 7 and the upper sleeve plate 8, respectively. When the two are closed, the two semicircular recesses 9 combine to form a complete circular sleeve hole for sleeving the rear wheel shaft.

[0029] In order to realize the automatic and accurate opening and closing and clamping of the upper sleeve plate 8, a control unit is integrated in the first fixing member. The control unit includes a sliding base 10 fixed on the mounting plate. A plurality of guide rods 11 are vertically arranged on the sliding base 10. A lower sliding block 13 and an upper sliding block 12 are slidably sleeved on the guide rods 11. The lower sliding block 13 is fixedly connected with the lower sleeve plate 7, and the upper sliding block 12 is fixedly connected with the upper sleeve plate 8. On the guide rods 11, a lower limit block 15 is fixed below the lower sliding block 13, and an upper limit block 14 is fixed above the upper sliding block 12. The distance between the upper limit block 14 and the lower limit block 15 is set to be equal to or slightly greater than the diameter of the standard rear wheel shaft. This design limits the positions of the upper sleeve plate 8 and the lower sleeve plate 7 to realize the center or diameter setting of the rear wheel shaft. The initial distance between the upper sliding block 12 and the upper limit block 14 is set to be equal to the initial distance between the lower sliding block 13 and the lower limit block 15.

[0030] In order to realize automatic triggering of the movement of the upper sleeve plate 8 and the lower sleeve plate 7, a fixed block 16 is arranged on each side of the sliding base 10. A first pull rope 17 is connected between the two fixed blocks 16. The two ends of the first pull rope 17 are connected with a pressing block 18. Each pressing block 18 is accommodated in the cavity of the corresponding fixed block 16, and the pressing bottom is provided with a first switch 20. The pressing block 18 is in constant contact with the first switch 20 at the bottom of the cavity through a first spring 19. When the first pull rope 17 moves, the first pull rope 17 bends and drives the pressing block 18 to move away from the first switch 20 against the first spring 19, triggering the first switch 20. The first switch 20 is electrically connected with the sliding base 10 which drives the upper sliding block 12 and the lower sliding block 13 to move towards each other. The sliding base 10 can be a linear module or a pneumatic cylinder to realize the movement of the upper sliding block 12 and the lower sliding block 13 towards each other.

[0031] In order to automatically adjust the protruding positions of the blocks 21 according to the actual size of the rear wheel shaft, the device is also provided with a measuring unit and an adjusting unit. The measuring unit includes a first inclined block 22 and a second inclined block 23 which are respectively embedded in the upper sleeve plate 8 and the lower sleeve plate 7. The inclined surface of the first inclined block 22 is oppositely arranged with the inclined surface of the second inclined block 23. A first placement groove 24 is formed on the upper sleeve plate 8 for accommodating the second inclined block 23, and a second placement groove 25 is formed on the lower sleeve plate 7 for accommodating the first inclined block 22.

[0032] The measuring unit further comprises several measuring tubes 26. Each measuring tube 26 comprises a first channel 27, a second channel 28 and a third channel 29 which are in communication with each other. A first piston 30 is arranged in the first channel 27 and is connected to the first inclined block 22 through a connecting rod. The second channel 28 is connected to an oil tank 32 in which a second piston 31 is arranged. The third channel 29 is connected to a corresponding adjusting tube 33 through a pipe 34.

[0033] The adjusting unit comprises a plurality of adjusting tubes 33, each of which corresponds to a block 21. The block 21 is slidingly arranged in the groove 9, and a third piston 35 is arranged in the adjusting tube 33 and is connected to the corresponding block 21 through a push rod.

[0034] A first one-way valve is arranged between the first channel 27 and the second channel 28 of the measuring tube 26, which allows fluid such as hydraulic oil to flow from the first channel 27 to the second channel 28. A second one-way valve is arranged between the third channel 29 and the first channel 27, which allows fluid to flow from the third channel 29 to the first channel 27. When the rear axle is placed in the groove 9 of the lower sleeve plate 7 and finally clamped by the upper and lower sleeve plates 7, the rear axle presses the first inclined block 22 and the second inclined block 23, causing them to move away from each other. The first inclined block 22 pushes the first piston 30 to move towards the inside of the measuring tube 26, i.e. towards the second channel 28, through the connecting rod. At this time, under the action of the first one-way valve, the fluid in the first channel 27 is pressed into the second channel 28, pushing the second piston 31 in the oil tank 32 to move to accommodate the oil, and at the same time, due to the pressure, the third piston 35 drives the block 21 to move back. This process is mainly used for initial reset or adaptation to smaller axle diameters.

[0035] When clamping is needed, the second piston 31 in the oil tank 32 is moved towards the measuring tube 26 to press the oil back. At this time, the first one-way valve is closed and the second one-way valve is opened, and the oil enters the first channel 27 through the third channel 29, pushing the first piston 30 and the third piston 35 to move outside the measuring tube 26. The movement of the first piston 30 is fed back to the inclined block through the connecting rod to maintain contact, and the movement of the third piston 35 pushes the corresponding block 21 to extend towards the center of the groove 9 until the end faces of all the blocks 21 are in contact with and pressed against the outer surface of the rear axle, thereby completing the self-adaptive enveloping clamping of rear axles of different diameters.

[0036] Working principle: Place the vehicle frame to be tested on the base 1. Adjust the position of the vehicle frame so that the front end is in contact with the first fixed unit 2 fixed on the base 1. Use the clamp of the first fixed unit 2 to firmly lock the front end of the vehicle frame.

[0037] Sliding the sliding plate 6 of the second fixing unit 3 along the base 1, the first fixing unit as a whole is moved to the position right below the rear wheel axle of the vehicle frame. Make sure that the groove 9 of the lower sleeve plate 7 is roughly aligned with the rear wheel axle. Then, place the rear wheel axle of the vehicle frame between the upper sleeve plate 8 and the lower sleeve plate 7, and continue to move, the first pull rope 17 drives the first switch 20 to trigger, and the driving source is started. The driving source drives the upper sliding block 12 to continue to move downward, and drives the lower sliding block 13 to move upward, until the upper sliding block 12 contacts the upper limit block 14, and the lower sliding block 13 contacts the lower limit block 15.

[0038] During this process, in order to realize the connection of the small-range diameter rear wheel axle in the first fixing unit, during the movement, the rear wheel axle respectively presses the first inclined block 22 and the second inclined block 23, forcing them to move away from each other. The movement of the first inclined block 22 pushes the first piston 30 in the measuring tube 26. The movement of the first piston 30 is uniformly transmitted to all the adjusting tubes 33 through the fluid medium in the pipeline, pushing the respective third pistons 35. The third pistons 35 in turn push the corresponding block bodies 21 to move, until the end faces of all the block bodies 21 are in contact with and pressed against the outer surface of the rear wheel axle, and the self-adaptive enveloping fixing is completed.

[0039] According to different loading modes, when the connection of the middle part of the vehicle frame is required, the fixed plate 36 of the second fixing unit is slid along the sliding shaft 37, so that the connecting hole thereon is aligned with the second fixing point 5 preset on the vehicle frame. Then, the locking member 38 such as a bolt is used to pass through the connecting hole and lock into the second fixing point 5, so as to firmly connect the fixed plate 36 with the vehicle frame.

[0040] After confirming that the vehicle frame has been connected by the first fixing unit 2, the first fixing unit or the combination of the second fixing unit, the actuator or the loading mechanism matched with the test equipment is started. According to the predetermined test load spectrum, the periodic or randomly fluctuating load is applied to the specific part of the vehicle frame by the actuator, the fatigue durability test is carried out, and the state of the vehicle frame is monitored until the predetermined cycle number is reached or fatigue damage occurs. The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A frame fatigue testing apparatus, characterized by: The utility model relates to a vehicle frame fixing device Base (1) for placing frame; First fixed unit (2) set up on base (1) for connecting frame front end; Second fixed unit (3) slides on base (1), can connect frame first fixed point (4) and second fixed point (5); It includes sliding plate (6) and first fixed part and second fixed part on sliding plate (6), the first fixed part includes the lower sleeve plate (7) and upper sleeve plate (8) with recess (9) separately, the upper sleeve plate (8) and lower sleeve plate (7) are combined for with frame sleeve joint.

2. A frame fatigue test apparatus according to claim 1, characterized by: The control unit is arranged between the upper sleeve plate (8) and the lower sleeve plate (7), the control unit further includes a sliding base (10), a guide rod (11), and an upper sliding block (12) and a lower sliding block (13) arranged on the guide rod (11), the upper sliding block (12) is connected with the upper sleeve plate (8), the lower sliding block (13) is fixedly connected with the lower sleeve plate (7), upper limit block (14) and lower limit block (15) are arranged on the guide rod (11), the limit block is arranged at the outer end of the sliding block, so as to control the moving distance of the upper sleeve plate (8) and the lower sleeve plate (7).

3. A frame fatigue test apparatus according to claim 2, characterized by: The first fixed point (4) is the rear wheel shaft of the frame, the distance between the upper limit block (14) and the lower limit block (15) is the diameter of the rear wheel shaft, the distance between the upper limit block (14) and the upper sliding block (12) and the distance between the lower limit block (15) and the lower sliding block (13) are the same.

4. A frame fatigue test apparatus according to claim 3, characterized by: The sliding base (10) is provided with a fixed block (16) outside, a first pull rope (17) is arranged between the fixed blocks (16), press blocks (18) are arranged at both ends of the first pull rope (17), the press blocks (18) are connected to the fixed blocks (16) by first springs (19), first switches (20) are arranged in the fixed blocks (16), when the press blocks (18) are separated from the first switches (20), the upper sliding block (12) and the lower sliding block (13) move towards each other.

5. A frame fatigue test apparatus according to claim 4, characterized by: A plurality of retractable block bodies (21) are arranged in the recess (9), the block bodies (21) are used for detecting the installation of the rear wheel shaft, and the block bodies (21) are arranged in the upper sleeve plate (8) and the lower sleeve plate (7) by an adjusting unit.

6. A frame fatigue test apparatus according to claim 5, characterized by: Measurement units are arranged at corresponding positions of the upper sleeve plate (8) and the lower sleeve plate (7), the measurement units include a first inclined block (22) arranged in the upper sleeve plate (8) and a second inclined block (23) arranged on the second sleeve plate, a first placement groove (24) is arranged at one side of the first inclined block (22), the first placement groove (24) corresponds to the second inclined block (23), a second placement groove (25) is arranged at one side of the second inclined block (23), and the second placement groove (25) corresponds to the first inclined block (22).

7. A frame fatigue test apparatus according to claim 6, characterized by: The measuring device further comprises a plurality of measuring tubes (26), the first channel (27) of the measuring tube (26) is provided with a first piston (30), the first piston (30) is connected with the inclined block; the first piston (30) is connected with the inclined block through the connecting rod, the second channel (28) of the measuring tube (26) is connected with the oil tank (32), the second piston (31) is arranged in the oil tank (32), the third channel (29) of the measuring tube (26) is connected with the adjusting tube (33) through the pipeline (34), the third piston (35) is arranged in the adjusting tube (33), and the third piston (35) is connected with the block (21); The first one-way valve is arranged between the first channel (27) and the second channel (28), and the second one-way valve is arranged between the third channel (29) and the first channel (27), when the first piston (30) moves to the second channel (28), the third piston (35) retracts, when the second piston (31) moves to the measuring tube (26), the first piston (30) and the third piston (35) move to the outside of the measuring tube (26).

8. The frame fatigue test apparatus according to claim 1, characterized by: The second fixing part comprises a fixing plate (36), the fixing plate (36) is connected with the sliding plate (6) through a sliding shaft (37), the sliding shaft (37) is fixed on the sliding plate (6), and the fixing plate (36) is movable on the sliding shaft (37), and the fixing plate (36) is provided with a connecting hole which is locked through a locking piece (38) with the second fixed point (5).

9. A test method of a frame fatigue test apparatus characterized by comprising: S1, place the frame to be measured on the base (1), and fix the front end of the frame using the first fixing unit (2); S2, slide the sliding plate (6) of the second fixing unit (3) along the base (1), so that the upper sleeve plate (8) and the lower sleeve plate (7) in the first fixing part are located above and below the first fixed point (4) of the frame respectively; Place the first fixed point (4) in the groove (9) of the lower sleeve plate (7); and after the first fixed point (4) triggers the first pull rope (17) and the first switch (20), drives the upper slide block (12) and the lower slide block (13) to move towards each other along the guide rod (11), so as to drive the upper sleeve plate (8) and the lower sleeve plate (7) to clamp the first fixed point (4) together; After the first fixed point (4) passes through the first inclined block (22) and the second inclined block (23), the first inclined block (22) and the second inclined block (23) push the first piston (30) in the measuring tube (26), and then drive the third piston (35) in the adjusting tube (33) through the cavity, so that a plurality of blocks (21) in the groove (9) are adaptively expanded and contracted until they are closely fitted with the surface profile of the first fixed point (4); S3, adjust the position of the fixing plate (36) on the sliding shaft (37) in the second fixing part, so that the connecting hole thereon is aligned with the second fixed point (5) of the frame, and the locking piece (38) is locked.

Images