A high-frequency bending fatigue testing equipment for steel fibers used in concrete

Abstract

The present invention relates to a testing device, and in particular to a high-frequency bending fatigue testing device for steel fibers used in concrete. It is necessary to design a high-frequency bending fatigue testing device for steel fibers used in concrete that can fix the steel fibers before the test without the need for additional human operations to fix them, which is relatively convenient. A high-frequency bending fatigue testing device for steel fibers used in concrete, including a support frame, a mounting frame, and a placement frame, etc. The front and rear sides of the top of the support frame are both symmetrically and slidingly connected with placement frames for placing steel fibers. A groove is formed between the placement frames on the left and right sides, and a mounting frame is fixed to the bottom of the support frame. The present invention places the steel fibers into the placement frame, starts the bending hydraulic cylinder so that the trigger mechanism limits the steel fibers, and the fixing mechanism also limits the steel fibers. The bending roller moves downward and then bends the limited steel fibers, thereby performing a bending fatigue test on the steel fibers. In this way, no additional human operations are required to fix the steel fibers, which is relatively convenient.

Description

Technical Field

[0001] The invention relates to a testing device, in particular to a high-frequency bending fatigue testing device for steel fibers used in concrete. Background Art

[0002] After the steel fiber is produced, in order to ensure the safety of subsequent use of the steel fiber, it is generally necessary to test the bending fatigue of the steel fiber.

[0003] Chinese patent publication number CN217466445U discloses a steel fiber bending test device, including a bottom plate, side plates, a top plate, a lower clamping block, an upper clamping block, a bracket, a support plate, a chuck, a control plate, a stretching rod, a stretching motor, a tension sensor, a baffle, a bending motor, a telescopic rod, a sphere, a controller, a display screen, a button and a bending sensor. Although the above patent can test the bending fatigue of steel fibers, it requires additional operation of the clamping block to fix the steel fibers before each test, and then the bending fatigue test of the steel fibers is performed. The operation is relatively cumbersome and affects the test efficiency.

[0004] The present invention aims to solve the problems existing in the above patents. To this end, a high-frequency bending fatigue testing device for steel fibers for concrete is proposed, which can fix the steel fibers without manual operation of other components before the test, thereby facilitating the testing of the steel fibers. Summary of the Invention

[0005] In order to overcome the disadvantage that before each test, humans need to operate the clamps to fix the steel fibers and then perform bending fatigue tests on the steel fibers, which is cumbersome and affects the test efficiency, the present invention provides a high-frequency bending fatigue testing device for steel fibers for concrete, which can fix the steel fibers without the need for manual operation of other components before the test, thereby facilitating the testing of the steel fibers.

[0006] The present invention is achieved through the following technical approaches:

[0007] A high-frequency bending fatigue testing device for steel fibers for concrete comprises a supporting frame, a mounting frame, a placing frame, a reset hydraulic cylinder, a U-shaped frame, a bending hydraulic cylinder and a bending roller. The front and rear sides of the top of the supporting frame are symmetrically and slidingly connected with placing frames for placing steel fibers. A groove is formed between the placing frames on the left and right sides. The bottom of the supporting frame is fixedly connected with a mounting frame, and a bending hydraulic cylinder is fixedly connected in the middle of the top of the mounting frame. The end of the telescopic rod of the bending hydraulic cylinder is fixedly connected with a bending roller for bending the steel fibers for bending fatigue testing. The bending roller is located directly above the four placing frames, and a reset hydraulic cylinder is fixedly connected in the middle of the top of the supporting frame. The end of the telescopic rod of the reset hydraulic cylinder is fixedly connected with a U-shaped frame for straightening and resetting the bent steel fibers. The U-shaped frame slides through the supporting frame and also comprises a trigger mechanism and a fixing mechanism. A trigger mechanism for limiting the steel fibers is provided between the placing frame and the bending hydraulic cylinder, and a fixing mechanism for limiting the steel fibers is provided on the placing frame.

[0008] Further explanation, the trigger mechanism includes a first spring, a sliding circular plate, a trigger frame, a guide rod, a second spring and a trigger rod. The guide rods are fixed to the outer sides of the tops of the four placement frames. A trigger frame for limiting the steel fiber is slidably mounted between the two guide rods on the left, and a trigger frame for limiting the steel fiber is also slidably mounted between the two guide rods on the right. The front and rear sides of the top of the left and right trigger frames are connected to the top of the placement frames with second springs. A sliding circular plate for driving the trigger frame to move downward is slidably mounted on the telescopic rod of the bending hydraulic cylinder. The sliding circular plate is in contact with the top of the trigger frame. A first spring is connected between the top of the sliding circular plate and the telescopic rod of the bending hydraulic cylinder. The bottoms of the left and right trigger frames are symmetrically fixed with trigger rods for driving the operation of the fixing mechanism.

[0009] Further description includes an auxiliary wheel, and the bottom ends of the four trigger rods are rotatably connected to the auxiliary wheel.

[0010] Further explanation, the fixing mechanism includes a guide rod, a third spring, a fixed block and a contact frame. The outer sides of the four placement frames are fixed with guide rods. A fixed block is slidably mounted between the two guide rods on the left, and a fixed block is slidably mounted between the two guide rods on the right. The top of the fixed block is an inclined surface. The inner sides of the left and right fixed blocks are respectively connected to the outer sides of the left and right placement frames with third springs. The third spring is mounted on the guide rod. The inner sides of the left and right fixed blocks are symmetrically fixed with contact frames front and back. The contact frame corresponds to the trigger rod, and the trigger rod moves downward to contact the contact frame.

[0011] Further description, it also includes a grading mechanism for adjusting the degree of bending steel fibers, the grading mechanism includes a fixed plate, a guide column, a first screw rod, a telescopic plate and a fourth spring, the upper and lower sides of the front side of the front left placement rack are fixedly connected with fixed plates, a guide column is fixedly connected between the two fixed plates, a telescopic plate for limiting the bending roller is slidably mounted on the guide column, a fourth spring is connected between the two sides of the telescopic plate, the front side of the front right placement rack is rotatably connected with the first screw rod for driving the telescopic plate to move, and the first screw rod threadably rotates and passes through the right side of the telescopic plate.

[0012] Further description, it also includes an adjustment mechanism for adjusting the position of the placement rack, the adjustment mechanism includes a fixed rack, a second screw rod, a synchronous belt and a knob, the fixed rack is fixedly connected to the lower part of the left and right side surfaces outside the mounting rack, and the left and right fixed racks are symmetrically rotated and connected with the second screw rod for driving the placement rack to move, the threads on the left and right sides of the front and rear second screw rods are opposite, and the front and rear second screw rods are respectively threaded and rotated and connected to the front and rear placement racks, the right sides of the front and rear second screw rods are driven by a synchronous belt, and the left end of the front second screw rod is fixed with a knob.

[0013] Further explanation, it also includes a guiding mechanism for guiding the steel fibers, which includes a rotating rod and a guide roller. There are five rotating rods evenly spaced and rotatably connected on the front and back sides of the top of the left and right trigger frames, and the middle of all the rotating rods are fixed with a guide roller for guiding the steel fibers.

[0014] Further explanation, it also includes an auxiliary pushing mechanism for straightening and resetting the steel fiber, the auxiliary pushing mechanism includes a mounting plate and an arc-shaped top plate, the front and rear sides of the top of the U-shaped frame are fixed with mounting plates, and the tops of the front and rear mounting plates are fixed with arc-shaped top plates for straightening and resetting the steel fiber.

[0015] The present invention is significantly improved in that:

[0016] 1. Place the steel fiber in the placement rack, start the bending hydraulic cylinder to limit the steel fiber by the trigger mechanism, and the fixing mechanism also limits the steel fiber. The bending roller moves downward and then bends the steel fiber after the limit, which is also a bending fatigue test for the steel fiber. In this way, the steel fiber is automatically fixed, and there is no need for manual operation of other components to fix the steel fiber, which is convenient for operation and improves test efficiency.

[0017] 2. Under the action of the grading mechanism, the downward movement distance of the bending roller can be limited according to demand. In this way, the degree of bending of the steel fiber can be adjusted according to demand, and then it can adapt to steel fibers of different lengths, and the use range of the equipment is wider.

[0018] 3. Under the action of the adjustment mechanism, the four placement racks can be moved inward and outward synchronously, without the need for operators to adjust the positions of the four placement racks individually, thereby improving the adjustment efficiency of the placement racks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the support frame of the present invention.

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the placement rack of the present invention.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the mounting frame of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the reset hydraulic cylinder of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the U-shaped frame of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the bending roller of the present invention.

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the trigger mechanism of the present invention.

[0028] Figure 10 It is a schematic diagram of the three-dimensional structure of the trigger frame of the present invention.

[0029] Figure 11 It is a schematic diagram of the three-dimensional structure of the fixing mechanism of the present invention.

[0030] Figure 12 It is a partial cross-sectional structural schematic diagram of the grading mechanism of the present invention.

[0031] Figure 13 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention.

[0032] Figure 14 It is a schematic diagram of the three-dimensional structure of the guide mechanism of the present invention.

[0033] Figure 15 It is a schematic diagram of the three-dimensional structure of the auxiliary propulsion mechanism of the present invention.

[0034] In the accompanying drawings: 1-support frame, 2-mounting frame, 21-placing frame, 22-reset hydraulic cylinder, 23-U-shaped frame, 3-bending hydraulic cylinder, 31-bending roller, 4-trigger mechanism, 41-first spring, 42-sliding circular plate, 43-trigger frame, 44-guide rod, 45-second spring, 46-trigger rod, 47-auxiliary wheel, 5-fixing mechanism, 51-guide rod, 52-third spring, 53-fixing block, 54-contact frame, 6-grading mechanism, 61-fixing plate, 62-guide column, 63-first screw rod, 64-telescopic plate, 66-fourth spring, 7-adjusting mechanism, 71-fixing frame, 72-second screw rod, 73-synchronous belt, 74-knob, 8-guide mechanism, 81-rotating rod, 82-guide roller, 9-auxiliary pushing mechanism, 91-mounting plate, 92-arc top plate. DETAILED DESCRIPTION

[0035] First of all, it should be noted that in the various described embodiments, identical components are provided with identical reference numerals or identical component names, wherein the disclosure contained throughout the entire description can be transferred to the same components having the same reference numerals or identical component names. Positional designations selected in the description, such as top, bottom, lateral, etc., also refer to the directly described and illustrated figures and are transferred to the new position in the event of a change in position.

[0036] Example 1

[0037] A high-frequency bending fatigue test device for steel fiber used in concrete, comprising a support frame 1, a mounting frame 2, a placement frame 21, a reset hydraulic cylinder 22, a U-shaped frame 23, a bending hydraulic cylinder 3, a bending roller 31, a trigger mechanism 4 and a fixing mechanism 5, see Figures 1-11 As shown, the front and rear sides of the top of the support frame 1 are symmetrically connected with a placement frame 21 in a sliding manner. A groove is formed between the placement frames 21 on the left and right sides. The placement frames 21 are used to place steel fibers. The bottom of the support frame 1 is installed with a mounting frame 2 by welding. A bending hydraulic cylinder 3 is fixedly connected to the middle of the top of the mounting frame 2. A bending roller 31 is fixed to the end of the telescopic rod of the bending hydraulic cylinder 3. The bending roller 31 is located just above the four placement frames 21. When the bending roller 31 moves downward and contacts the steel fiber, the bending roller 31 can bend the steel fiber to perform bending fatigue. Labor test, a reset hydraulic cylinder 22 is fixedly connected to the middle of the top of the support frame 1, and a U-shaped frame 23 is fixed to the end of the telescopic rod of the reset hydraulic cylinder 22. The U-shaped frame 23 slides through the support frame 1. When the U-shaped frame 23 moves upward, the U-shaped frame 23 can press the bent steel fiber straight and reset it. A trigger mechanism 4 is arranged between the placement frame 21 and the bending hydraulic cylinder 3. When the trigger mechanism 4 is operated, the trigger mechanism 4 can limit the steel fiber. A fixing mechanism 5 is provided on the placement frame 21. When the fixing mechanism 5 is operated, the fixing mechanism 5 can limit the steel fiber.

[0038] The trigger mechanism 4 includes a first spring 41, a sliding circular plate 42, a trigger frame 43, a guide rod 44, a second spring 45 and a trigger rod 46. Figure 1 、 Figure 2 、 Figure 9 and Figure 10 As shown, the outer sides of the tops of the four placement racks 21 are fixedly connected with guide rods 44, and a trigger rack 43 is slidably mounted between the two guide rods 44 on the left, and a trigger rack 43 is also slidably mounted between the two guide rods 44 on the right. When the trigger rack 43 moves downward and contacts the placement rack 21, the trigger rack 43 can limit the steel fiber. The front and rear sides of the top of the trigger racks 43 on the left and right sides are connected to the top of the placement rack 21. A sliding circular plate 42 is slidably mounted on the telescopic rod of the bending hydraulic cylinder 3. The sliding circular plate 42 contacts the top of the trigger rack 43. When the sliding circular plate 42 moves downward, the sliding circular plate 42 can drive the trigger rack 43 to move downward. A first spring 41 is connected between the top of the sliding circular plate 42 and the telescopic rod of the bending hydraulic cylinder 3. The bottom of the trigger racks 43 on the left and right sides are symmetrically fixed with trigger rods 46. When the trigger rod 46 moves downward and contacts the fixing mechanism 5, the trigger rod 46 can drive the fixing mechanism 5 to operate.

[0039] Also includes auxiliary wheels 47, see Figure 10 As shown, the bottom ends of the four trigger rods 46 are rotatably connected to the auxiliary wheels 47.

[0040] The fixing mechanism 5 includes a guide rod 51, a third spring 52, a fixing block 53 and a contact frame 54, see Figure 1 、 Figure 2 and Figure 11 As shown, guide rods 51 are installed on the outer sides of the four placement racks 21 by welding connection, a fixed block 53 is slidably installed between the two guide rods 51 on the left, and a fixed block 53 is slidably installed between the two guide rods 51 on the right, the top of the fixed block 53 is an inclined surface, and the inner sides of the left and right fixed blocks 53 are respectively connected to the outer sides of the left and right placement racks 21 with third springs 52, and the third springs 52 are sleeved on the guide rods 51. The inner sides of the left and right fixed blocks 53 are symmetrically installed with contact racks 54 by welding connection, and the contact rack 54 corresponds to the trigger rod 46, and the trigger rod 46 moves downward to contact the contact rack 54.

[0041] First, pull the left and right side placement racks 21 to move to the appropriate position for placing the steel fibers, and then place the two steel fibers between the two front placement racks 21 and between the two rear placement racks 21 respectively, and then start the telescopic rod of the bending hydraulic cylinder 3 to extend. The extension of the telescopic rod of the bending hydraulic cylinder 3 drives the bending roller 31 to move downward, and the extension of the telescopic rod of the bending hydraulic cylinder 3 also drives the trigger mechanism 4 to move downward, and the trigger mechanism 4 moves downward to contact the steel fiber. The trigger mechanism 4 cooperates with the placement rack 21 to limit the steel fiber, and there is no need for additional human operation to fix the steel fiber, which is more convenient. At the same time, the downward movement of the trigger mechanism 4 also drives the fixing mechanism 5 to operate, and the fixing mechanism 5 operates to contact the steel fiber. The fixing mechanism 5 limits the steel fiber. At this time, the bending roller 31 continues to move downward to contact the steel fiber, and the bending roller 31 bends the steel fiber. When the bending roller 31 moves downward to the appropriate position, the telescopic rod of the bending hydraulic cylinder 3 is started to shorten and drive the bending roller 31 moves upward and disengages from the steel fiber, the bending hydraulic cylinder 3 is closed, and the reset hydraulic cylinder 22 is started again. The telescopic rod of the reset hydraulic cylinder 22 is extended to drive the U-shaped frame 23 to move upward, and the U-shaped frame 23 moves upward to contact the steel fiber. The U-shaped frame 23 moves upward to straighten the bent steel fiber, and the telescopic rod of the reset hydraulic cylinder 22 is shortened and reset to drive the U-shaped frame 23 to move downward and reset. The telescopic rod of the bending hydraulic cylinder 3 is started again to extend and drive the bending roller 31 to move downward to bend the steel fiber. This is repeated, and the steel fiber can be continuously bent at high frequency, and the bending fatigue of the steel fiber is tested. When the steel fiber bending fatigue test is completed, the bending hydraulic cylinder 3 is started to drive the bending roller 31 to move upward and reset, and the telescopic rod of the bending hydraulic cylinder 3 is reset to drive the trigger mechanism 4 to move upward and reset. The trigger mechanism 4 is reset without limiting the fixing mechanism 5, and the fixing mechanism 5 is also reset, and the tested steel fiber is removed from the placement rack 21.

[0042] When the telescopic rod of the bending hydraulic cylinder 3 is extended, the extension of the telescopic rod of the bending hydraulic cylinder 3 drives the sliding circular plate 42 downward through the first spring 41, and the sliding circular plate 42 moves downward to drive the left and right trigger frames 43 to move downward, the second spring 45 is compressed, and the left and right trigger frames 43 move downward to drive the four trigger rods 46 to move downward, and the four trigger rods 46 move downward to drive the four auxiliary wheels 47 to move downward. When the left and right trigger frames 43 move downward and contact the placement frame 21, the left and right trigger frames 43 limit the steel fiber through the placement frame 21, and the left and right trigger frames 43 stop moving downward so that the sliding circular plate 42 stops moving downward, and the telescopic rod of the bending hydraulic cylinder 3 continues to extend so that the first spring 41 is compressed. At the same time, the four trigger rods 46 drive the fixing mechanism 5 to operate through the four auxiliary wheels 47 to limit the steel fiber. Due to the action of the auxiliary wheels 47, the trigger rod 46 can drive the fixing mechanism 5 to operate more smoothly, and the bending roller 31 bends the steel fiber again. When the steel fiber bending fatigue test is completed, the telescopic rod of the bending hydraulic cylinder 3 is started to shorten and reset, so that the first spring 41 is extended and reset. The telescopic rod of the bending hydraulic cylinder 3 continues to shorten and reset, and the sliding circular plate 42 is driven by the first spring 41 to move upward and reset. The sliding circular plate 42 is reset without limiting the left and right trigger frames 43. Due to the action of the second spring 45, the left and right trigger frames 43 move upward and reset without limiting the steel fibers. The reset of the left and right trigger frames 43 drives the four trigger rods 46 to move upward and reset.

[0043] When the left and right trigger frames 43 move downward, the four trigger rods 46 contact the four contact frames 54 via the auxiliary wheels 47. The four trigger rods 46 drive the four contact frames 54 inward via the auxiliary wheels 47. The inward movement of the four contact frames 54 drives the left and right fixed blocks 53 inward, compressing the third springs 52. The left and right fixed blocks 53 move inward and contact the steel fibers. The left and right fixed blocks 53 limit the steel fibers, and the bending rollers 31 bend the steel fibers again. After the steel fiber bending fatigue test is completed, the left and right trigger frames 43 move upward and reset, driving the four trigger rods 46 upward and reset. The four trigger rods 46 reset and disengage from the four contact frames 54. Due to the action of the third springs 52, the left and right fixed blocks 53 move outward and reset, disengaging from the steel fibers.

[0044] Example 2

[0045] On the basis of embodiment 1, a grading mechanism 6 is further included. The grading mechanism 6 includes a fixed plate 61, a guide post 62, a first screw rod 63, a telescopic plate 64 and a fourth spring 66. Figure 1 、 Figure 2 and Figure 12As shown, fixed plates 61 are installed on the upper and lower sides of the front side of the front left placement rack 21 by welding, and a guide column 62 is fixedly connected between the two fixed plates 61. A telescopic plate 64 is slidably mounted on the guide column 62. When the bending roller 31 moves downward and contacts the telescopic plate 64, the telescopic plate 64 can limit the bending roller 31. A fourth spring 66 is connected between the two sides of the telescopic plate 64. The front side of the front right placement rack 21 is rotatably connected to a first screw rod 63, and the first screw rod 63 is threadedly rotated and passes through the right side of the telescopic plate 64. When the first screw rod 63 rotates, the first screw rod 63 can drive the telescopic plate 64 to move.

[0046] The adjusting mechanism 7 includes a fixing frame 71, a second screw rod 72, a synchronous belt 73 and a knob 74. Figure 1 and Figure 13 As shown, the lower parts of the left and right outer sides of the mounting frame 2 are both installed with fixing frames 71 by welding connection, and a second screw rod 72 is symmetrically rotated between the left and right fixing frames 71 on the front and back sides. The threads on the left and right sides of the front and rear second screw rods 72 are opposite, and the front and rear second screw rods 72 are respectively threaded and rotated to be connected to the front and rear placement frames 21 on the front and rear sides. When the second screw rod 72 rotates, the second screw rod 72 can drive the placement frame 21 to move. The right sides of the front and rear second screw rods 72 are driven by a synchronous belt 73, and the left end of the front second screw rod 72 is fixed with a knob 74.

[0047] When the degree of bending of the steel fiber needs to be adjusted, the first screw rod 63 is twisted to rotate forward and backward alternately. The first screw rod 63 rotates forward and backward alternately to drive the telescopic plate 64 to move up and down through the thread. When the telescopic plate 64 moves up and down to the position where the steel fiber needs to be bent, the first screw rod 63 is stopped from being twisted, and the telescopic plate 64 stops moving up and down. Then, when the placement frame 21 moves, the placement frame 21 extends or contracts the telescopic plate 64 through the first screw rod 63 and the guide column 62, and the fourth spring 66 also continuously extends and contracts. Then, when the bending roller 31 moves downward to bend the steel fiber, the bending roller 31 moves downward to contact the telescopic plate 64, and the telescopic plate 64 limits the bending roller 31. At this time, the telescopic rod of the bending hydraulic cylinder 3 is activated to drive the bending roller 31 to move upward and out of contact with the steel fiber. In this way, the degree of bending of the steel fiber can be adjusted according to demand.

[0048] First, twist the knob 74 to rotate it forward and backward alternately. The forward and backward rotation of the knob 74 drives the front second screw rod 72 to rotate forward and backward alternately. The forward and backward rotation of the front second screw rod 72 drives the rear second screw rod 72 to rotate forward and backward alternately through the synchronous belt 73. The forward and backward rotation of the front and rear second screw rods 72 drives the four placement racks 21 to move inward and outward at the same time through the threads. When the four placement racks 21 move inward and outward to the appropriate position for placing the steel fibers, stop twisting the knob 74, and the front and rear second screw rods 72 stop driving the four placement racks 21 to move inward and outward, and then the two steel fibers can be placed on the front and rear placement racks 21 respectively. In this way, the placement racks 21 can move synchronously, making it more convenient to adjust the position of the placement racks 21.

[0049] Example 3

[0050] On the basis of embodiment 1 and embodiment 2, a guide mechanism 8 is further included. The guide mechanism 8 includes a rotating rod 81 and a guide roller 82. Figure 2 and Figure 14 As shown, five rotating rods 81 are evenly spaced and rotatably connected on the front and back sides of the top of the trigger frames 43 on the left and right sides. Guide rollers 82 are fixedly mounted in the middle of all the rotating rods 81 to guide the steel fibers.

[0051] The auxiliary pushing mechanism 9 includes a mounting plate 91 and an arc-shaped top plate 92. Figure 6 and Figure 15 As shown, mounting plates 91 are fixed to the front and rear sides of the top of the U-shaped frame 23, and arc-shaped top plates 92 are fixed to the tops of the front and rear mounting plates 91. When the arc-shaped top plates 92 move upward, the arc-shaped top plates 92 can press the steel fibers straight and reset them.

[0052] When steel fiber moves downwards and steel fiber is carried out repeated bending test, steel fiber bending can make two ends slide, and guide roller 82 then guides steel fiber. Like this, can make steel fiber move more smoothly, avoid getting stuck and influence bending.

[0053] When the U-shaped frame 23 moves upward, it drives the curved top plate 92 upward via the mounting plate 91. The curved top plate 92 moves upward and contacts the steel fibers, and the U-shaped frame 23 presses the steel fibers straight and resets them via the curved top plate 92. When the U-shaped frame 23 moves downward and resets, it drives the curved top plate 92 downward and resets them via the mounting plate 91. This allows the U-shaped frame 23 to better press the steel fibers straight and reset them.

[0054] Finally, it is necessary to point out that the above content is only used to help understand the technical solution of the present invention and cannot be understood as limiting the scope of protection of the present invention; non-essential improvements and adjustments made by technical personnel in this field based on the above content of the present invention are all within the scope of protection required by the present invention.

Claims

1. A high-frequency bending fatigue test device for steel fiber for concrete, comprising a support frame (1), a mounting frame (2), a placement frame (21), a reset hydraulic cylinder (22), a U-shaped frame (23), a bending hydraulic cylinder (3) and a bending roller (31), wherein the placement frames (21) for placing steel fibers are symmetrically connected to the front and rear sides of the top of the support frame (1) in a sliding manner, and a groove is formed between the placement frames (21) on the left and right sides. The bottom of the support frame (1) is fixedly connected to the mounting frame (2), and the middle of the top of the mounting frame (2) is fixedly connected with a bending hydraulic cylinder (3), and the end of the telescopic rod of the bending hydraulic cylinder (3) is fixedly connected with a bending roller (31) for bending the steel fiber for bending fatigue testing, and the bending roller (31) is located directly above the four placement frames (21), and the middle of the top of the support frame (1) is fixedly connected with a reset hydraulic cylinder (22), and the end of the telescopic rod of the reset hydraulic cylinder (22) is fixedly connected with a U-shaped frame (23) for straightening and resetting the bent steel fiber, and the U-shaped frame (23) slides through the support frame (1), characterized in that It also includes a trigger mechanism (4) and a fixing mechanism (5), wherein a trigger mechanism (4) for limiting the position of the steel fiber is provided between the placement frame (21) and the bending hydraulic cylinder (3), and a fixing mechanism (5) for limiting the position of the steel fiber is provided on the placement frame (21); The invention also includes a grading mechanism (6) for adjusting the degree of bending of steel fibers, wherein the grading mechanism (6) includes a fixed plate (61), a guide column (62), a first screw rod (63), a telescopic plate (64) and a fourth spring (66). The fixed plates (61) are fixedly connected to the upper and lower sides of the front side of the front left side placement frame (21). A guide column (62) is fixedly connected between the two fixed plates (61). A telescopic plate (64) for limiting the bending roller (31) is slidably mounted on the guide column (62). A fourth spring (66) is connected between the two sides of the telescopic plate (64). The first screw rod (63) for driving the telescopic plate (64) to move is rotatably connected to the front side of the front right side placement frame (21). The first screw rod (63) is threadedly rotated and passes through the right side of the telescopic plate (64).

2. A high frequency bending fatigue testing device for steel fiber for concrete according to claim 1, characterized in that: The trigger mechanism (4) includes a first spring (41), a sliding circular plate (42), a trigger frame (43), a guide rod (44), a second spring (45) and a trigger rod (46). The top outer sides of the four placement frames (21) are fixed with guide rods (44). A trigger frame (43) for limiting the position of the steel fiber is slidably mounted between the two guide rods (44) on the left side. A trigger frame (43) for limiting the position of the steel fiber is also slidably mounted between the two guide rods (44) on the right side. The top of the trigger frame (43) on the left and right sides is fixed with a guide rod (44). A second spring (45) is connected between the front and rear sides and the top of the placement frame (21). A sliding circular plate (42) is slidably mounted on the telescopic rod of the bending hydraulic cylinder (3) for driving the trigger frame (43) to move downward. The sliding circular plate (42) contacts the top of the trigger frame (43). A first spring (41) is connected between the top of the sliding circular plate (42) and the telescopic rod of the bending hydraulic cylinder (3). The bottoms of the trigger frames (43) on the left and right sides are symmetrically fixed with trigger rods (46) for driving the fixing mechanism (5) to operate.

3. A high frequency bending fatigue testing device for steel fiber used in concrete as claimed in claim 2, characterized in that: It also includes an auxiliary wheel (47), and the bottom ends of the four trigger rods (46) are all rotatably connected to the auxiliary wheel (47).

4. A high frequency bending fatigue testing device for steel fiber for concrete as claimed in claim 3, characterized in that: The fixing mechanism (5) includes a guide rod (51), a third spring (52), a fixing block (53) and a contact frame (54). The outer sides of the four placement frames (21) are fixedly connected to the guide rod (51). The fixing block (53) is slidably mounted between the two left guide rods (51). The fixing block (53) is slidably mounted between the two right guide rods (51). The top of the fixing block (53) is an inclined surface. The inner side surfaces of the left and right fixing blocks (53) are respectively connected to the outer sides of the left and right placement frames (21). The third spring (52) is sleeved on the guide rod (51). The inner side surfaces of the left and right fixing blocks (53) are symmetrically fixed to the contact frame (54) front and back. The contact frame (54) corresponds to the trigger rod (46). The trigger rod (46) moves downward to contact the contact frame (54).

5. A high frequency bending fatigue testing device for steel fiber for concrete as claimed in claim 4, characterized in that: The adjusting mechanism (7) is also included for adjusting the position of the placement rack (21). The adjusting mechanism (7) includes a fixing rack (71), a second screw rod (72), a synchronous belt (73) and a knob (74). The lower parts of the left and right side surfaces of the mounting rack (2) are fixedly connected with the fixing rack (71). The second screw rod (72) for driving the placement rack (21) to move is symmetrically rotated between the left and right fixing racks (71). The threads on the left and right sides of the front and rear second screw rods (72) are opposite. The front and rear second screw rods (72) are respectively threadedly rotated and connected to the front and rear placement racks (21). The right sides of the front and rear second screw rods (72) are driven by the synchronous belt (73). The left end of the front second screw rod (72) is fixedly sleeved with a knob (74).

6. A high frequency bending fatigue testing device for steel fiber used in concrete as claimed in claim 5, characterized in that: The invention also includes a guide mechanism (8) for guiding the steel fiber, the guide mechanism (8) including a rotating rod (81) and a guide roller (82), and five rotating rods (81) are evenly spaced and rotatably connected on both sides of the top front and rear sides of the trigger frame (43) on the left and right sides, and the guide roller (82) for guiding the steel fiber is fixedly mounted in the middle of all the rotating rods (81).

7. A high frequency bending fatigue testing device for steel fiber for concrete as claimed in claim 6, characterized in that: The auxiliary pushing mechanism (9) is further provided for straightening and resetting the steel fibers. The auxiliary pushing mechanism (9) comprises a mounting plate (91) and an arc-shaped top plate (92). The mounting plates (91) are fixedly connected to the front and rear sides of the top of the U-shaped frame (23). The arc-shaped top plates (92) for straightening and resetting the steel fibers are fixedly connected to the tops of the front and rear mounting plates (91).

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