Fully automatic steel bar forward and reverse bending testing machine

Abstract

The present invention discloses a fully automatic steel bar forward and reverse bending test machine, comprising a frame, a hydraulic mechanism, a positioning mechanism and a temperature control mechanism, wherein the positioning mechanism is arranged on the frame for placing steel bars, the hydraulic mechanism is arranged in conjunction with the positioning mechanism for bending steel bars, the temperature control mechanism is arranged on one side of the positioning mechanism for controlling the initial temperature of the steel bars and assisting in feeding and positioning, the temperature control mechanism comprises a temperature-changing component, an auxiliary component and a limiter component, wherein the temperature-changing component is used to change the surface temperature of the steel bars and drive feeding, the auxiliary component is arranged on one side of the temperature-changing component for clamping the steel bars and assisting in feeding, the limiter component is arranged in the discharging direction of the temperature-changing component for limiting the displacement of the other end of the steel bars to avoid leaving the range of the positioning mechanism. The present invention improves the accuracy of the steel bar bending test.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar testing equipment, in particular to a full-automatic steel bar forward and reverse bending testing machine. Background Art

[0002] The steel bar bending test is a test method used to evaluate the mechanical properties and plastic deformation capacity of steel bars during bending. The steel bar forward and reverse bending test machine is a device dedicated to this test, mainly used to perform plane forward and reverse bending tests on steel bars.

[0003] The existing steel bar forward and reverse bending test machine is mainly composed of a positioning table for placing steel bars and a pushing device for bending steel bars. The steel bars are placed at the corresponding limit position of the positioning table, and the hydraulic cylinder is driven to press the steel bars. The steel bars are bent at a certain angle in the pushing direction. After bending, the surface of the steel bars is observed to see whether cracks appear in order to judge the mechanical properties of the steel bars. When reverse bending is required, the steel bars are placed in the corresponding position of the positioning table, and then pushed by the hydraulic cylinder to be bent in the reverse direction.

[0004] For the rigor of the experiment, the ambient temperature required for the bending test is generally within the range of 10℃~35℃, and the test sample is also required to be consistent with the temperature in the test room. However, it takes time to wait for the test to stand still, and human judgment is not accurate. For tests with strict temperature requirements, the test temperature should be 23±5℃, and the temperature of the sample needs to be additionally controlled. The temperature deviation will affect the test results. The existing bending test machine has a single function and has certain limitations. Summary of the invention

[0005] The object of the present invention is to provide a fully automatic steel bar forward and reverse bending testing machine to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a fully automatic steel bar forward and reverse bending test machine, comprising a frame, a hydraulic mechanism, a positioning mechanism and a temperature control mechanism, wherein the positioning mechanism is arranged on the frame for placing steel bars, the hydraulic mechanism is arranged in conjunction with the positioning mechanism for bending steel bars, the temperature control mechanism is arranged on one side of the positioning mechanism for controlling the initial temperature of the steel bars and assisting in feeding and positioning, the temperature control mechanism comprises a temperature changing component, an auxiliary component and a limit component, wherein the temperature changing component is used to change the surface temperature of the steel bars and drive the feeding, the auxiliary component is arranged on one side of the temperature changing component for clamping the steel bars and assisting in feeding, the limit component is arranged in the discharging direction of the temperature changing component for limiting the displacement of the other end of the steel bars to avoid leaving the range of the positioning mechanism;

[0007] According to the above technical solution, the temperature-changing component includes a fixed frame, several fixed seats, a rotating shaft, a temperature-changing cylinder, a driving module 1, an air pipe and an air box, wherein the fixed seats are fixed on the fixed frame at intervals, the rotating shaft is rotatably arranged on the fixed frame and rotatably cooperates with the fixed seats, the temperature-changing cylinder is a hollow structure and is sleeved on the upper end of the rotating shaft, the driving module 1 is connected to each rotating shaft and is used to drive each rotating shaft to rotate synchronously, two air supply channels are opened in the fixed seat, the inlet hose of the air supply channel is connected to the air supply pipe, the outlet of the air supply channel is connected to the temperature-changing cylinder, and the air box is connected to the air supply pipe.

[0008] According to the above technical solution, a circle of racks is arranged on the circumference of the temperature-changing cylinder to lock the spiral body on the surface of the steel bar to prevent slippage, and the racks are provided with air holes for outputting air flow.

[0009] According to the above technical solution, two gas pipes are used to transport high-temperature and low-temperature gases respectively. The gas box is connected to an air pump as a power source. The gas box is equipped with a heating and cooling module inside to change the gas temperature. The module composition is not unique and can be in the form of electric heating or coolant heat exchange. The drive module is preferably a pulley motor drive structure, and the rack surface is preferably covered with a layer of thermal sensing module to detect the temperature state of the steel bars.

[0010] According to the above technical solution, the auxiliary component includes a mobile module one, a mobile plate and several rotating drums, wherein the mobile plate is fixed on the mobile end of the mobile module one, the rotating drum is rotatably set on the mobile plate, the rotating drum is provided with a rack layer and a sponge layer, the rack layer and sponge layer of the same rotating drum are arranged at intervals, and the rack layer and sponge layer of adjacent rotating drums are staggered.

[0011] According to the above technical solution, the rack layer is provided with drainage grooves on its circumference for draining the water squeezed out of the sponge layer downwards. The surface of the movable plate is provided with a number of weight sensing grooves for sensing the quality of the water and thereby determining the amount of water vapor generated during the temperature change of the steel bars.

[0012] According to the above technical solution, the limiting assembly includes a moving module 2, a moving seat, a driving module 2 and a limiting wheel, wherein the moving seat is fixed at the driving end of the moving module 2, the driving module 2 is arranged on the moving seat, and the limiting wheel is fixed at the driving end of the driving module 2.

[0013] According to the above technical solution, the positioning mechanism includes a driving module three, a group of positioning seats, an angle measuring ruler, a motor, a gear set, a visual detector, a group of electric rods and a limit plate, wherein the positioning seat is relatively arranged at the driving end of the driving module three, and the driving module three is used to drive the positioning seat to rotate toward or away from each other, the positioning seat is provided with a positioning groove, the angle measuring ruler is arranged relative to the positioning seat, the motor is arranged on a positioning seat, the gear set is respectively connected to the motor and the visual detector, the electric rod is fixed on the corresponding positioning seat and the driving end is passed through the positioning groove, and the limit plate is fixed to the driving end of the electric rod.

[0014] According to the above technical solution, the driving module three includes a driving motor, a pulley group, a driving rod and a bevel gear group, wherein the bevel gear group is arranged on the positioning seat and the driving rod, and the pulley group connects the driving motor and the driving rod.

[0015] According to the above technical solution, the hydraulic mechanism includes a hydraulic cylinder and a top block, wherein the top block is fixed at the driving end of the hydraulic cylinder.

[0016] According to the above technical solution, the frame is provided with a movable protective cover relative to the positioning mechanism cover.

[0017] According to the above technical solution, the specific method is as follows:

[0018] Step 1: Feeding: the staff inputs the specifications of the test steel bars, the auxiliary component moves to adjust the distance between it and the temperature-changing component, puts the steel bars between the auxiliary component and the temperature-changing component, and the temperature-changing component drives it to move forward;

[0019] Step 2: Temperature change: input the required temperature value according to the room temperature, the gas box adjusts the temperature of the internal stored gas, and delivers airflow to the corresponding air pipe through the external air pump. The airflow converges to the temperature change cylinder through the air delivery channel of the fixed seat, and sprays airflow to the surface of the steel bar through each air hole, thereby changing the surface temperature of the steel bar;

[0020] Step 3: Positioning. During the adjustment of the steel bar temperature, the positioning mechanism increases the deflection angle of the two positioning seats according to the requirements of the forward and reverse bending. When the steel bar is ready, the temperature-changing component moves it into the positioning slot of the positioning seat. At the same time, the limit component at the other end assists the steel bar to move to prevent it from falling out of the positioning slot. After the steel bar moves to the specified position, the limit plate moves down to the steel bar surface according to the steel bar specifications. At the same time, the auxiliary component and the limit component are reset to release the restriction.

[0021] Step 4: Bending. After positioning, the hydraulic mechanism performs bending operations at the set speed and bending angle;

[0022] Step 5: Detection. After the steel bar is bent, the visual detector rotates to the bending position to take pictures. Through imaging magnification, it is identified whether there are cracks on the surface of the steel bar, and the specific state of the cracks is detected to make a preliminary judgment on the quality of the steel bar.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a temperature control mechanism, can accurately control the temperature of the steel bar according to the experimental requirements, and can remove the water vapor generated in the temperature change process, adjust the airflow according to the amount of water vapor, thereby avoiding the influence of water vapor on subsequent bending operations and improving the accuracy of the experiment; by providing a positioning mechanism, it can position according to the specifications of the steel bar, detect the stress conditions in the bending process, and judge whether abnormal deviation occurs according to the position of the detection force, further improving the accuracy and safety of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the testing machine of the present invention;

[0026] Figure 2 It is a partial schematic diagram of the testing machine of the present invention;

[0027] Figure 3 The present invention Figure 2 A magnified schematic diagram of area A;

[0028] Figure 4 It is a schematic diagram of the temperature-changing component and auxiliary component of the present invention;

[0029] Figure 5 It is a schematic diagram of the temperature-changing cylinder of the present invention;

[0030] Figure 6 is a schematic diagram of a limit assembly of the present invention;

[0031] Figure 7 is a third schematic diagram of the drive module of the present invention;

[0032] Figure 8 is a schematic diagram of a limiting plate of the present invention;

[0033] In the figure: 1, frame; 11, protective cover; 2, hydraulic mechanism; 21, hydraulic cylinder; 22, top block; 3, positioning mechanism; 31, drive module three; 311, drive motor; 312, pulley group; 313, drive rod; 314, bevel gear group; 32, positioning seat; 321, positioning slot; 33, angle measuring ruler; 34, motor; 35, gear group; 36, visual inspection instrument; 37, electric rod; 38, limit plate; 381, inspection slot; 382, ​​spring; 383, pressing block; 4, Temperature-changing assembly; 41. fixing frame; 42. fixing seat; 43. rotating shaft; 44. temperature-changing cylinder; 441. rack; 442. air hole; 45. driving module one; 46. air pipe; 47. air box; 5. auxiliary assembly; 51. moving module one; 52. moving plate; 521. weight sensing slot; 53. rotating cylinder; 531. rack layer; 532. sponge layer; 533. drainage slot; 6. limiting assembly; 61. moving module two; 62. moving seat; 63. driving module two; 64. limiting wheel. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-7 The present invention provides a technical solution: a fully automatic steel bar forward and reverse bending test machine, comprising a frame 1, a hydraulic mechanism 2, a positioning mechanism 3 and a temperature control mechanism, wherein the positioning mechanism 3 is arranged on the frame 1 for placing steel bars, the hydraulic mechanism 2 is arranged in conjunction with the positioning mechanism 3 for bending steel bars, the temperature control mechanism is arranged on one side of the positioning mechanism 3 for controlling the initial temperature of the steel bars and assisting in feeding and positioning, the temperature control mechanism comprises a temperature changing component 4, an auxiliary component 5 and a limit component 6, wherein the temperature changing component 4 is used to change the surface temperature of the steel bars and drive the feeding, the auxiliary component 5 is arranged on one side of the temperature changing component 4 for clamping the steel bars and assisting in feeding, and the limit component 6 is arranged in the discharging direction of the temperature changing component 4 for limiting the displacement of the other end of the steel bars to avoid leaving the range of the positioning mechanism 3;

[0037] The temperature-changing component 4 includes a fixed frame 41, several fixed seats 42, a rotating shaft 43, a temperature-changing cylinder 44, a driving module 45, an air pipe 46 and an air box 47, wherein the fixed seats 42 are fixed on the fixed frame 41 at intervals, the rotating shaft 43 is rotatably set on the fixed frame 41 and rotates with the fixed seat 42, the temperature-changing cylinder 44 is a hollow structure and is sleeved on the upper end of the rotating shaft 43, the driving module 45 is connected to each rotating shaft 43, and is used to drive each rotating shaft 43 to rotate synchronously, two air supply channels 421 are opened in the fixed seat 42, the inlet hose of the air supply channel 421 is connected to the air supply pipe 46, the outlet of the air supply channel 421 is connected to the temperature-changing cylinder 44, and the air box 47 is connected to the air supply pipe 46.

[0038] A circle of racks 441 are arranged around the circumference of the temperature-changing cylinder 44 to lock the spiral body on the surface of the steel bar to prevent slippage. The racks 441 are provided with air holes 442 for outputting air flow.

[0039] It should be noted that: there are preferably two gas pipes 46, which are used to transport high-temperature and low-temperature gases respectively. The gas box 47 is connected to an air pump as a power source. The gas box 47 has a built-in heating and cooling module for changing the gas temperature. The module composition is not unique, and can be in the form of electric heating or coolant heat exchange. The drive module 45 is preferably a pulley motor drive structure, and the surface of the rack 441 is preferably covered with a layer of thermal sensing module to detect the temperature state of the steel bars.

[0040] The auxiliary component 5 includes a moving module 51, a moving plate 52 and several rotating drums 53, wherein the moving plate 52 is fixed to the moving end of the moving module 51, the rotating drum 53 is rotatably set on the moving plate 52, and the rotating drum 53 is provided with a rack layer 531 and a sponge layer 532. The rack layer 531 and the sponge layer 532 of the same rotating drum 53 are arranged at intervals, and the rack layers 531 and sponge layers 532 of adjacent rotating drums 53 are staggered.

[0041] In actual operation, the rotating drum 53 is preferably staggered with the temperature-changing drum 44, and the moving module 51 is driven by a cylinder slide rail to adjust the distance between the rotating drum 53 and the temperature-changing drum 44 according to the specifications of the steel bars. The sponge layer 532 is used to absorb water vapor that may be generated on the surface of the steel bars during temperature change to avoid affecting the subsequent bending process.

[0042] The rack layer 531 is provided with drainage grooves 533 on its circumference for draining the water squeezed out of the sponge layer 532 downwards. The surface of the movable plate 52 is provided with a plurality of weight sensing grooves 521 for sensing the quality of the water and thus judging the amount of water vapor generated during the temperature change of the steel bar.

[0043] The limiting assembly 6 includes a moving module 61, a moving seat 62, a driving module 63 and a limiting wheel 64, wherein the moving seat 62 is fixed to the driving end of the moving module 61, the driving module 63 is arranged on the moving seat 62, and the limiting wheel 64 is fixed to the driving end of the driving module 63.

[0044] In actual operation, the moving module 2 61 is driven by a cylinder, and the driving module 2 63 is driven by a motor screw. The moving module 2 61 drives the moving seat 62 to move horizontally, and the driving module 2 63 is used to drive the limiting wheel 64 to move longitudinally, thereby changing the orientation of the limiting wheel 64.

[0045] The positioning mechanism 3 includes a driving module 31, a group of positioning seats 32, an angle measuring scale 33, a motor 34, a gear set 35, a visual detector 36, a group of electric rods 37 and a limit plate 38, wherein the positioning seat 32 is relatively arranged at the driving end of the driving module 31, the driving module 31 is used to drive the positioning seat 32 to rotate toward or away from each other, the positioning seat 32 is provided with a positioning groove 321, the angle measuring scale 33 is arranged relative to the positioning seat 32, the motor 34 is arranged on a positioning seat 32, the gear set 35 is respectively connected to the motor 34 and the visual detector 36, the electric rod 37 is fixed on the corresponding positioning seat 32 and the driving end is penetrated in the positioning groove 321, and the limit plate 38 is fixed on the driving end of the electric rod 37.

[0046] The driving module three 31 includes a driving motor 311 , a pulley set 312 , a driving rod 313 and a bevel gear set 314 , wherein the bevel gear set 314 is arranged on the positioning seat 32 and the driving rod 313 , and the pulley set 312 connects the driving motor 311 and the driving rod 313 .

[0047] The hydraulic mechanism 2 includes a hydraulic cylinder 21 and a top block 22 , wherein the top block 22 is fixed to the driving end of the hydraulic cylinder 21 .

[0048] The frame 1 is provided with a movable protective cover 11 relative to the positioning mechanism 3 .

[0049] The specific implementation methods are as follows:

[0050] Step 1: Feeding, the staff inputs the specifications of the test steel bar, the auxiliary component 5 moves to adjust the distance between it and the temperature-changing component 4, puts the steel bar between the auxiliary component 5 and the temperature-changing component 4, and the temperature-changing component 4 drives it to move forward;

[0051] Step 2: temperature change. According to the room temperature, the required temperature value is input, and the gas box 47 adjusts the temperature of the internal stored gas. The airflow is delivered to the corresponding air delivery pipe 46 through the external air pump. The airflow is converged to the temperature change cylinder 44 through the air delivery channel 421 of the fixing seat 42, and the airflow is sprayed to the surface of the steel bar through each air hole 442, thereby changing the surface temperature of the steel bar;

[0052] Step 3: Positioning. During the adjustment of the steel bar temperature, the positioning mechanism 3 increases the deflection angle of the two positioning seats 32 according to the requirements of the forward and reverse bending. When the steel bar is ready, the temperature-changing component 4 moves it into the positioning groove 321 of the positioning seat 32. At the same time, the limit component 6 at the other end assists the steel bar to move to prevent it from falling out of the positioning groove 321. After the steel bar moves to the specified position, the limit plate 38 moves down to the steel bar surface according to the steel bar specifications. At the same time, the auxiliary component 5 and the limit component 6 are reset to release the restriction.

[0053] Step 4: Bending. After positioning is completed, the hydraulic mechanism 2 performs bending operation at the set speed and bending angle;

[0054] Step 5: Detection. After the steel bar is bent, the visual detector 36 is rotated to the bending position to take pictures. By imaging and magnifying, it is identified whether cracks appear on the surface of the steel bar, and the specific state of the cracks is detected to make a preliminary judgment on the quality of the steel bar.

[0055] Specifically, in step 2, during the temperature change process of the steel bar, the temperature change component 4 can drive the steel bar to move forward and backward to ensure uniform heating or cooling. During this period, the sponge layer 532 of the auxiliary component 5 will absorb the water vapor produced on the surface of the steel bar. Through the forward and backward movement of the steel bar, the sponge layer 532 is squeezed by the steel bar or the corresponding rack layer 531, and the internal moisture is drained to the movable plate 52 along the drainage groove 533. The weight sensing groove 521 detects the water flow rate to determine whether there is too much water vapor. For example, a water vapor allowable range a is set. If the measured water vapor output is always within this range, no additional processing is performed, and the water vapor is absorbed and processed by the sponge layer 532; if the measured water vapor output exceeds this range, then on the basis of the sponge layer 532, the output temperature-changing airflow and the output flow rate are additionally adjusted, that is, the temperature-changing airflow will undergo an additional dehumidification step to further eliminate the probability of water vapor conversion in the airflow, or by increasing the flow rate of the input airflow, while changing the temperature, the water vapor on the surface of the steel bar is taken away with the help of high-speed airflow.

[0056] In step five, the analysis of crack morphology can help determine the cause of the crack. The visual detector 36 will make a basic judgment on the state of the crack captured, such as determining whether the crack is a surface crack or an internal crack, a micro crack or a macro crack (crack type identification); determining whether the crack is linear, wavy or irregular (crack shape identification), where linear cracks may be caused by stress concentration or rapid cooling, while wavy or irregular cracks may be related to the material's inhomogeneity or complex stress state; detecting the length and width of the crack can indicate the severity of the crack development, small cracks may be stress cracks in the initial stage, while wider cracks may indicate that the crack has expanded; the number of cracks is also an important indicator for evaluating the quality of steel bars. A large number of cracks may indicate problems in the production or processing of the steel bars, such as uneven cooling, stress concentration, etc.

[0057] Example 2

[0058] like Figure 8 As shown, in order to determine whether the steel bar is abnormally deviated during the bending operation, on the basis of Example 1, the limit plate 38 is provided with a detection groove 381, a pressure detection module is provided at the bottom of the detection groove 381, and springs 382 are fixed at intervals in the detection groove 381, and the other end of the spring 382 is connected to a pressing block 383.

[0059] During the bending process of the steel bar, the middle part is bent under force, while the two sides are deflected. If there is an abnormal deviation, such as the top block 22 is misaligned with the steel bar during the bending process, and the steel bar is forced to move in the lateral direction, the detection slot 381 will identify the force state detected in real time. For example, if an abnormal pressure signal is detected at the position of the pressure detection module corresponding to the pressing block 383 where no force should be applied, it can be determined that the deviation of the steel bar is abnormal and needs to be checked. The checking method is not limited to manual inspection or remote inspection by taking pictures of the bending part with a visual detector 36 to avoid potential safety hazards.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully automatic steel bar forward and reverse bending testing machine, comprising a frame (1), a hydraulic mechanism (2), a positioning mechanism (3) and a temperature control mechanism, characterized in that: The positioning mechanism (3) is arranged on the frame (1) and is used to place the steel bars. The hydraulic mechanism (2) is arranged in cooperation with the positioning mechanism (3) and is used to bend the steel bars. The temperature control mechanism is arranged on one side of the positioning mechanism (3) and is used to control the initial temperature of the steel bars and assist in feeding and positioning. The temperature control mechanism comprises a temperature changing component (4), an auxiliary component (5) and a position limiting component (6). The temperature changing component (4) is used to change the surface temperature of the steel bars and drive the feeding. The auxiliary component (5) is arranged on one side of the temperature changing component (4) and is used to clamp the steel bars and assist in feeding. The position limiting component (6) is arranged in the discharging direction of the temperature changing component (4) and is used to limit the displacement of the other end of the steel bars to prevent them from leaving the range of the positioning mechanism (3). The temperature-changing component (4) comprises a fixed frame (41), a plurality of fixed seats (42), a rotating shaft (43), a temperature-changing cylinder (44), a driving module (45), an air pipe (46) and an air box (47), wherein the fixed seats (42) are fixed on the fixed frame (41) at intervals, the rotating shaft (43) is rotatably arranged on the fixed frame (41) and rotatably cooperates with the fixed seat (42), the temperature-changing cylinder (44) is a hollow structure and is sleeved on the upper end of the rotating shaft (43), the driving module (45) is connected to each rotating shaft (43) and is used to drive each rotating shaft (43) to rotate synchronously, two air supply channels (421) are provided in the fixed seat (42), an inlet hose of the air supply channel (421) is connected to the air supply pipe (46), an outlet of the air supply channel (421) is connected to the temperature-changing cylinder (44), and the air box (47) is connected to the air supply pipe (46).

2. The fully automatic steel bar forward and reverse bending testing machine according to claim 1 is characterized in that: The temperature-changing cylinder (44) is provided with a circle of racks (441) on its circumference for locking the spiral body on the surface of the steel bar to prevent slippage. The racks (441) are provided with air holes (442) for outputting air flow.

3. The fully automatic steel bar forward and reverse bending testing machine according to claim 2 is characterized in that: The auxiliary component (5) comprises a moving module (51), a moving plate (52) and a plurality of rotating drums (53), wherein the moving plate (52) is fixed to the moving end of the moving module (51), the rotating drum (53) is rotatably arranged on the moving plate (52), the rotating drum (53) is provided with a rack layer (531) and a sponge layer (532), the rack layer (531) and the sponge layer (532) of the same rotating drum (53) are arranged at intervals, and the rack layers (531) and the sponge layers (532) of adjacent rotating drums (53) are arranged in a staggered manner.

4. The fully automatic steel bar forward and reverse bending testing machine according to claim 3 is characterized in that: The rack layer (531) is provided with drainage grooves (533) on its circumference for draining the water squeezed out of the sponge layer (532) downwards. The surface of the movable plate (52) is provided with a plurality of weight sensing grooves (521) for sensing the quality of the water and thereby determining the amount of water vapor generated during the temperature change of the steel bar.

5. The fully automatic steel bar forward and reverse bending testing machine according to claim 4 is characterized in that: The limiting assembly (6) comprises a moving module 2 (61), a moving seat (62), a driving module 2 (63) and a limiting wheel (64), wherein the moving seat (62) is fixed to the driving end of the moving module 2 (61), the driving module 2 (63) is arranged on the moving seat (62), and the limiting wheel (64) is fixed to the driving end of the driving module 2 (63).

6. The fully automatic steel bar forward and reverse bending testing machine according to claim 5, characterized in that: The positioning mechanism (3) comprises a driving module three (31), a group of positioning seats (32), an angle measuring ruler (33), a motor (34), a gear group (35), a visual detector (36), a group of electric rods (37) and a limit plate (38), wherein the positioning seat (32) is relatively arranged at the driving end of the driving module three (31), the driving module three (31) is used to drive the positioning seat (32) to rotate towards or away from each other, the positioning seat (32) is provided with a positioning groove (321), the angle measuring ruler (33) is arranged relative to the positioning seat (32), the motor (34) is arranged on a positioning seat (32), the gear group (35) is respectively connected to the motor (34) and the visual detector (36), the electric rod (37) is fixed on the corresponding positioning seat (32) and the driving end is inserted into the positioning groove (321), and the limit plate (38) is fixed to the driving end of the electric rod (37).

7. The fully automatic steel bar forward and reverse bending testing machine according to claim 6, characterized in that: The driving module three (31) comprises a driving motor (311), a pulley group (312), a driving rod (313) and a bevel gear group (314), wherein the bevel gear group (314) is arranged on a positioning seat (32) and the driving rod (313), and the pulley group (312) connects the driving motor (311) and the driving rod (313).

8. The fully automatic steel bar forward and reverse bending testing machine according to claim 7, characterized in that: The hydraulic mechanism (2) comprises a hydraulic cylinder (21) and a top block (22), wherein the top block (22) is fixed to the driving end of the hydraulic cylinder (21).

9. The fully automatic steel bar forward and reverse bending testing machine according to claim 8, characterized in that: The limit plate (38) is provided with a detection groove (381), a pressure detection module is arranged at the bottom of the detection groove (381), a spring (382) is fixed at intervals in the detection groove (381), and the other end of the spring (382) is connected to a pressing block (383).

10. The fully automatic steel bar forward and reverse bending testing machine according to claim 9, characterized in that: The specific usage is as follows: Step 1: feeding, the staff inputs the specifications of the test steel bar, the auxiliary component (5) moves to adjust the distance between it and the temperature-changing component (4), the steel bar is placed between the auxiliary component (5) and the temperature-changing component (4), and the temperature-changing component (4) drives it to move forward; Step 2: temperature change, inputting the required temperature value according to the room temperature, the gas box (47) adjusts the temperature of the internal stored gas, and delivers airflow to the corresponding air delivery pipe (46) through an external air pump, and the airflow is converged to the temperature change cylinder (44) through the air delivery channel (421) of the fixing seat (42), and the airflow is sprayed onto the surface of the steel bar through each air hole (442), thereby changing the surface temperature of the steel bar; Step 3: Positioning. During the adjustment of the steel bar temperature, the positioning mechanism (3) increases the deflection angle of the two positioning seats (32) according to the requirements of the forward and reverse bending. When the steel bar is ready, the temperature-changing component (4) moves it into the positioning groove (321) of the positioning seat (32). At the same time, the limiting component (6) at the other end assists the movement of the steel bar to prevent it from falling out of the positioning groove (321). After the steel bar moves to the specified position, the limiting plate (38) moves down to the surface of the steel bar according to the steel bar specifications. At the same time, the auxiliary component (5) and the limiting component (6) are reset to release the restriction. Step 4: Bending. After positioning is completed, the hydraulic mechanism (2) performs bending operation at a set speed and bending angle; Step 5: Detection: After the steel bar is bent, the visual detector (36) is rotated to the bending position to take pictures, and the image is magnified to identify whether cracks appear on the surface of the steel bar, and the specific state of the cracks is detected to make a preliminary judgment on the quality of the steel bar.

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