CN114279819A

CN114279819A - Steel bar bending tester capable of intelligently replacing core

Info

Publication number: CN114279819A
Application number: CN202111679247.7A
Authority: CN
Inventors: 曹志群; 曹憬; 王大远; 孙鑫; 殷波; 仇影
Original assignee: Jiangsu Xinke Engineering Quality Inspection Co ltd
Current assignee: Jiangsu Xinke Engineering Quality Inspection Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-05
Anticipated expiration: 2041-12-31
Also published as: CN114279819B

Abstract

The invention relates to the technical field of steel experiment equipment, in particular to a steel bar bending tester capable of intelligently changing cores. This application has the advantage that makes things convenient for the workman to change curved core.

Description

Steel bar bending tester capable of intelligently replacing core

Technical Field

The invention relates to the technical field of steel experimental equipment, in particular to a steel bar bending tester capable of intelligently replacing a core.

Background

The steel bar bending tester is special equipment for cold bending test and plane reverse bending test of steel bars, and is used for inspecting the deformation capacity of the steel bars through the bending test and observing whether the steel bars have defects or not

Chinese patent No. CN210465162U discloses a steel bar bending tester, which comprises a worktable, a turntable rotatably connected to the worktable, a plurality of mounting holes formed at the top of the turntable, and fixed push posts installed in the mounting holes.

Because the testing machine often needs to test different diameter's reinforcing bar, consequently need the manual frequent change of realizing to the fixed push post of workman, have obvious not enough.

Disclosure of Invention

For the convenience of worker's change and decide the post that pushes away, this application provides a reinforcing bar bending test machine that can intelligent core of trading.

The application provides a pair of can intelligent core-changing reinforcing bar bending test machine adopts following technical scheme:

the utility model provides a can intelligence trade reinforcing bar bending test machine of core, include the workstation, rotate connect in the carousel of workstation, vertical slip is worn to be equipped with a plurality of curved cores on the carousel, and is a plurality of the coaxial setting of curved core just by interior and arrange in proper order outward, still be equipped with in the workstation and be used for the drive the lifting unit that curved core goes up and down.

Through adopting above-mentioned technical scheme, the workman rises through the curved core of the suitable diameter of drive assembly drive to this makes curved core protrusion carousel, with this makes curved core can be used for the bending test of reinforcing bar. A plurality of curved cores set up on the workstation together to this workman only need adjust, need not the dismouting.

Optionally, adjacent two curved core normal running fit, lifting unit is including being located first loading board in the workstation, connect in first motor of first loading board below, the output shaft of first motor passes first loading board is connected with first bull stick, first bull stick with except that the diameter is the biggest outside the curved core, all the other all be equipped with the arch on the inside wall of curved core, every all open the confession on the inner wall of curved core and correspond the spiral groove that the arch slided, the bottom of spiral groove is sealed, except that the diameter is minimum outside the curved core, all the other equal vertical division has the groove of sliding on the inside wall of curved core, the bottom of groove of sliding seals and the top with correspond the upper surface of curved core communicates with each other, the top of spiral groove communicates with each other in corresponding the groove of sliding.

Through adopting above-mentioned technical scheme, the workman starts first motor through control system, and the output shaft of first motor drives first bull stick and rotates, and first bull stick drives the arch that corresponds and slides in the helicla flute on the minimum curved core inner wall of diameter to the minimum curved core atress of this diameter upwards protrudes the carousel, and the arch on the first bull stick moves gradually to being close to the bottom of helicla flute on the minimum curved core inner wall of diameter. When the bending core with the smallest diameter moves upwards, the protrusion on the outer side wall of the bending core can slide upwards in the sliding groove on the inner wall of the adjacent bending core. When the bulge on the first rotating rod moves to the bottom end of the spiral groove on the inner wall of the bending core with the smallest diameter, the bulge on the outer side wall of the bending core with the smallest diameter just slides to the communication position of the spiral groove and the sliding groove on the adjacent bending core. After that, the first rotating rod can drive the bending core with the minimum diameter to rotate, so that the bulge on the outer side wall of the bending core with the minimum diameter can rotate into the spiral groove of the inner wall of the adjacent bending core and move along the spiral direction of the spiral groove, and the adjacent bending core gradually rises. Repeating the above manner, the respective bending cores can be sequentially raised in a direction away from the first rotating rod. The worker only needs to control the rotation number of the first rotating rod through the control system, so that the bending core with the proper diameter protrudes out of the rotating disc.

During reverse adjustment, the worker makes the output shaft antiport of first motor through control system, and the curved core of protrusion carousel except that the diameter is the biggest, the synchronous antiport of all the other curved cores under the drive of first bull stick to this protrusion carousel and the biggest curved core of diameter is under the effect of arch and helicla flute, moves down along the groove of sliding gradually. By repeating the above-described manner, the bending cores of all the protruding turntables can be sequentially lowered in the same manner in the direction approaching the first rotary shaft.

Optionally, the protrusions are arranged in a hemispherical shape.

Through adopting above-mentioned technical scheme, the area of contact of arch and helicla flute has been reduced in the hemisphere type setting to this arch can be more smooth and easy slide in the helicla flute.

Optionally, a plurality of annular electromagnets are disposed on the first bearing plate, one electromagnet corresponds to one bent core and is located below the corresponding bent core, the electromagnets are configured to repel the corresponding bent core, and the plurality of electromagnets are electrically connected to the first motor through a control system.

Through adopting above-mentioned technical scheme, during reverse regulation, the workman realizes the circular telegram to the electro-magnet through control system, makes the curved core keep unsettled through electro-magnet and the repulsion force that corresponds between the curved core, treats that the arch rotates to the inslot that slides that corresponds after, realizes cutting off the power supply to the electro-magnet again, and the curved core falls to first loading board on the effect of gravity afterwards. The regulation and control are realized when the bending cores are reversely regulated, and the bending cores protruding out of the rotary table are ensured to sequentially descend along the direction close to the first rotary rod, so that the resetting of each bending core can be smoothly realized.

Optionally, the outer side wall of the bending core with the largest diameter is provided with a vertical first limiting strip, and the workbench is provided with a first limiting groove for the vertical sliding of the first limiting strip.

Through adopting above-mentioned technical scheme, first spacing and first spacing groove cooperation realize that circumference is spacing to the curved core, when reducing first bull stick and rotating, drive each curved core synchronous revolution, lead to the curved core to be difficult to the possibility of salient carousel in proper order.

Optionally, the driving assembly includes a second bearing plate disposed in the workbench and a second motor disposed below the second bearing plate, an output shaft of the second motor penetrates through the second bearing plate and is coaxially connected with a second rotating rod, a shift lever is disposed on an outer side wall of the second rotating rod, a deflection groove is formed between an inner side wall and an outer side wall of each bent core, one side of each deflection groove is a fixed side, the other side of each deflection groove is a sliding side, all the fixed sides of the deflection grooves are arranged in a collinear manner, distances between the sliding sides and the corresponding fixed sides are gradually increased along a direction away from the second rotating rod, the sliding sides are opposite to the corresponding fixed sides and are inclined downwards, and the shift lever is in sliding fit with each sliding side.

Through adopting above-mentioned technical scheme, the output shaft of second motor passes through the second bull stick and drives the driving lever and rotate, and the fixed side in deviation groove is kept away from gradually to the driving lever to the side that slides of contradicting the deviation groove. The driving lever continues to rotate, and because the slip side is inclined towards the ground in the circumferential direction, under the action of the supporting force of the driving lever, the bent core moves upwards under the stress and gradually protrudes out of the turntable until the bottom end of the bent core moves onto the driving lever, so that the bent core can be used for the bending test of the steel bar. Because the distance between each slip side to the corresponding fixed side is gradually increased along the direction away from the second rotating rod, each bent core can move upwards in sequence along the direction away from the second rotating rod under the continuous pushing of the shifting rod. When the output shaft of the second motor rotates reversely, the second rotating rod drives the shifting lever to rotate reversely, the shifting lever moves back into the corresponding deflection groove from the bottom end of the bent core again and finally clings to the fixed side of the deflection groove, and each bent core can descend sequentially along the direction close to the second rotating rod.

Optionally, any two adjacent curved cores are provided with second limiting grooves on the corresponding side walls, two corresponding second limiting grooves are provided with second limiting pieces therebetween, and the bottom ends of the second limiting pieces are fixedly connected to the second bearing plate.

Through adopting above-mentioned technical scheme, the second spacing piece is inserted and is established in the second spacing inslot that corresponds two adjacent curved cores to this realizes spacingly to the curved core, has reduced the possibility that takes place relative rotation between two adjacent curved cores.

Optionally, the shifting lever is rotatably sleeved with a roller sleeve.

Through adopting above-mentioned technical scheme, the roller can rotate on the driving lever to this driving lever can be more smooth and easy promotion curved core rise.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a worker drives the bending core with a proper diameter to ascend through the driving assembly, so that the bending core protrudes out of the rotary table, and the bending core can be used for bending test of the steel bars. The plurality of bending cores are arranged on the workbench together, so that workers only need to adjust and do not need to disassemble and assemble;

2. the regulation and control are realized when the bending cores are reversely regulated, and the bending cores protruding out of the rotary table are ensured to sequentially descend along the direction close to the first rotary rod, so that the resetting of each bending core can be smoothly realized.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present application.

Fig. 2 is an exploded view of the connection relationship between the bending core, the first rotating rod, the protrusion, and the first motor in embodiment 1 of the present application.

Fig. 3 is a sectional view of the bending core in example 1 of the present application.

Fig. 4 is a sectional view of a rotary disk with a partially curved core protruding in embodiment 1 of the present application.

Fig. 5 is a schematic structural diagram of embodiment 2 of the present application.

Fig. 6 is a schematic structural diagram of a positional relationship among the bending core, the shift lever, and the second rotating lever in embodiment 2 of the present application.

Fig. 7 is an exploded view between two adjacent bending cores in example 2 of the present application.

Fig. 8 is a schematic structural view of a rotary disk with a partially curved core protruding in embodiment 2 of the present application.

Description of reference numerals: 1. a work table; 2. a turntable; 3. bending the core; 31. a helical groove; 32. a sliding groove; 33. a fixed side; 34. a slipping side; 35. a second limit groove; 41. a first bearing plate; 42. a first motor; 43. a first rotating lever; 44. a protrusion; 5. an electromagnet; 6. a first limit strip; 71. a second carrier plate; 72. a second motor; 73. a second rotating rod; 74. a deflector rod; 8. a second limiting sheet; 9. and (6) rolling.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses reinforcing bar bending test machine that can intelligent core changing.

Example 1

Referring to fig. 1 and 2, the reinforcing bar bending test machine that can intelligent core changing includes that inside cavity sets up workstation 1, rotate and connect in workstation 1's

carousel

2, 2 levels of carousel set up.

Vertical slip wears to be equipped with a plurality of curved cores 3 on the carousel 2, and a plurality of curved cores 3 coaxial settings just by interior and arrange in proper order outward, and in workstation 1 was all penetrated to the bottom of every curved core 3, still was equipped with the lifting unit who is used for driving curved core 3 and goes up and down in the workstation 1.

Referring to fig. 1, 2 and 3, the lifting assembly includes a first supporting plate 41 horizontally disposed in the worktable 1, and a first motor 42 connected to a lower surface of the first supporting plate 41, the first motor 42 is a forward/reverse motor and electrically connected to the control system, and the first supporting plate 41 is located below the bending core 3.

The output shaft of first motor 42 passes first loading board 41 and coaxial coupling has first bull stick 43, first bull stick 43 with except that the biggest curved core 3 of diameter, all be equipped with arch 44 on the inside wall of all the other curved cores 3, all vertically open on the inner wall of every curved core 3 has the helicla flute 31 that supplies to correspond arch 44 and slide, the bottom of helicla flute 31 is sealed, two adjacent curved cores 3 normal running fit.

Except the bending core 3 with the smallest diameter, the inner side walls of the other bending cores 3 are vertically provided with sliding grooves 32, the bottom ends of the sliding grooves 32 are closed and communicated with the upper surface of the corresponding bending core 3, and the top ends of the spiral grooves 31 are communicated with the corresponding sliding grooves 32.

Before detection, the bottom end of each curved core 3 is pressed on the first bearing plate 41, and the top surface of each curved core 3 is coplanar with the upper surface of the turntable 2.

Referring to fig. 1, 2 and 3, when a worker starts the first motor 42 through the control system, the output shaft of the first motor 42 drives the first rotating rod 43 to rotate, the first rotating rod 43 drives the corresponding protrusion 44 to slide in the spiral groove 31 on the inner wall of the bending core 3 with the smallest diameter, so that the bending core 3 with the smallest diameter is forced to protrude upwards out of the rotary table 2, and the protrusion 44 on the first rotating rod 43 gradually moves to be close to the bottom end of the spiral groove 31 on the inner wall of the bending core 3 with the smallest diameter.

When the bending core 3 with the smallest diameter moves upwards, the protrusion 44 on the outer side wall can slide upwards in the sliding groove 32 on the inner wall of the adjacent bending core 3. When the protrusion 44 on the first rotating rod 43 moves to the bottom end of the spiral groove 31 on the inner wall of the minimum diameter bending core 3, the protrusion 44 on the outer side wall of the minimum diameter bending core 3 just slides to the communication part of the spiral groove 31 and the sliding groove 32 on the adjacent bending core 3.

Thereafter, the first rotating rod 43 can rotate the bending core 3 with the smallest diameter, so that the protrusion 44 on the outer side wall of the bending core 3 with the smallest diameter can rotate into the spiral groove 31 on the inner wall of the adjacent bending core 3 and move along the spiral direction, thereby gradually raising the adjacent bending core 3.

Repeating the above-described manner, the respective bending cores 3 can be sequentially raised in a direction away from the first rotating lever 43. The worker only needs to control the number of rotations of the first rotating lever 43 by the control system so that the bending core 3 of a proper diameter protrudes out of the rotating disc 2.

Referring to fig. 1 and 2, a vertical first limiting strip 6 is arranged on the outer side wall of the bending core 3 with the largest diameter, and a first limiting groove (not shown in the figure) for the vertical sliding of the limiting strip is formed on the workbench 1. Through the sliding fit of first spacing strip 6 and first spacing groove, realize spacingly to each curved core 3, when reducing first bull stick 43 and rotate, drive each curved core 3 synchronous rotation, lead to curved core 3 to be difficult to the possibility of salient carousel 2 in proper order.

Referring to fig. 1, 2 and 4, during reverse adjustment, a worker rotates the output shaft of the first motor 42 in reverse direction through the control system, and the bending cores 3 protruding out of the rotary table 2 except for the bending core 3 with the largest diameter synchronously rotate in reverse direction under the driving of the first rotating rod 43, so that the bending core 3 protruding out of the rotary table 2 and having the largest diameter gradually moves downwards along the sliding slot 32 under the action of the protrusion 44 and the spiral slot 31.

By repeating the above-described manner, the bending cores 3 of all the projecting rotating discs 2 can be sequentially lowered in the same manner in the direction approaching the first rotating shaft 43.

Referring to fig. 2 and 3, the protrusion 44 is disposed in a hemispherical shape, so that a contact area between the protrusion 44 and the spiral groove 31 is reduced, and the protrusion 44 can slide in the spiral groove 31 more smoothly.

Referring to fig. 1, 2 and 4, during reverse adjustment, the bending cores 3 protruding out of the rotary table 2 may move downward against the friction force due to gravity, so that the protrusions 44 between two adjacent bending cores 3 are not moved into the sliding grooves 32 from the corresponding spiral grooves 31, and thus the respective bending cores 3 protruding out of the rotary table 2 are difficult to sequentially descend in a direction approaching the first rotary rod 43, which may cause a great obstacle to a worker adjusting the bending cores 3 with a proper diameter.

Referring to fig. 1, 2 and 4, in order to solve the above problem, a plurality of annular electromagnets 5 are embedded on the first carrier plate 41, one electromagnet 5 corresponds to one bending core 3, the electromagnet 5 is located below the corresponding bending core 3 and is used for repelling the corresponding bending core 3, and the plurality of electromagnets 5 are electrically connected to the first motor 42 through the control system.

Referring to fig. 1, 2 and 4, during reverse adjustment, a worker turns on the electromagnet 5 through the control system, the bending core 3 is kept suspended through the repulsive force between the electromagnet 5 and the corresponding bending core 3, after the protrusion 44 rotates into the corresponding sliding groove 32, the electromagnet 5 is turned off, and then the bending core 3 falls onto the first bearing plate 41 under the action of gravity.

Referring to fig. 1, 2 and 4, in the above manner, when the bending cores 3 are adjusted reversely, the respective bending cores 3 protruding out of the rotary table 2 are ensured to descend sequentially in a direction close to the first rotating rod 43, so that each bending core 3 can be reset smoothly.

The implementation principle of the embodiment 1 is as follows: before detection, the bottom end of each curved core 3 is pressed on the first bearing plate 41, and the top surface of each curved core 3 is coplanar with the upper surface of the turntable 2.

The workman starts first motor 42 through control system, and the output shaft of first motor 42 drives first bull stick 43 and rotates, and first bull stick 43 drives corresponding arch 44 and slides in the helicla flute 31 on the minimum curved core 3 inner wall of diameter to this minimum curved core 3 atress of diameter upwards protrudes carousel 2, and arch 44 on the first bull stick 43 gradually moves to being close to the bottom of helicla flute 31 on the minimum curved core 3 inner wall of diameter.

When the adjustment is performed in the reverse direction, a worker reversely rotates the output shaft of the first motor 42 through the control system, and energizes the electromagnet 5, so that the bending core 3 is kept suspended by the repulsive force between the electromagnet 5 and the corresponding bending core 3. Except the curved core 3 which protrudes out of the rotary table 2 and has the largest diameter, the other curved cores 3 synchronously rotate in the opposite direction under the driving of the first rotating rod 43, after the protrusion 44 rotates into the corresponding sliding groove 32, the electromagnet 5 is powered off, and then the curved core 3 falls onto the first bearing plate 41 under the action of gravity. By repeating the above-described manner, the bending cores 3 of all the projecting rotating discs 2 can be sequentially lowered in the same manner in the direction approaching the first rotating shaft 43.

Example 2

Referring to fig. 5 and 6, the difference between the present embodiment and embodiment 1 is that the driving assembly includes a second supporting plate 71 horizontally disposed in the worktable 1, and a second motor 72 disposed on a lower surface of the second supporting plate 71, wherein the second supporting plate 71 is located below each bending core 3, and the second motor 72 is a forward/reverse rotation motor and is electrically connected to the control system.

Referring to fig. 5, 6 and 7, an output shaft of the second motor 72 passes through the second carrier plate 71 and is coaxially connected with a second rotating rod 73, two horizontal shift levers 74 are disposed on an outer side wall of the second rotating rod 73, and the two shift levers 74 are symmetrically disposed about an axis of the second rotating rod 73.

Referring to fig. 5, 6 and 7, a deflection groove is formed between the inner and outer sidewalls of each bending core 3, the deflection groove is communicated with the bottom end of the corresponding bending core 3, and each bending core 3 is slidably sleeved on the second rotating rod 73 through the deflection groove.

Two deflection grooves are symmetrically formed in each bending core 3 about the axis of the second rotating rod 73, and the two deflection grooves in each bending core 3 are arranged in one-to-one correspondence with the two shift rods 74.

Referring to fig. 5, 6 and 8, one side of the deflection slot is a fixed side 33, the other side is a sliding side 34, the fixed sides 33 of all the deflection slots are arranged in a collinear manner, the distance between the sliding side 34 and the fixed side 33 on each bending core 3 is gradually increased along the direction away from the second rotating rod 73, the sliding side 34 inclines downwards along the circumferential direction opposite to the corresponding fixed side 33, and the deflector rod 74 is in sliding fit with the sliding side 34 of the corresponding deflection slot.

Before the detection is started, the bottom surface of each curved core 3 is pressed against the second bearing plate 71, and the top surface of each curved core 3 is flush with the top surface of the rotating disc 2, at this time, the shift lever 74 is tightly attached to the fixed side 33 of the corresponding deflection slot.

The worker starts the second motor 72 through the control system, the output shaft of the second motor 72 drives the shift lever 74 to rotate through the second rotating rod 73, and the shift lever 74 gradually gets away from the fixed side 33 of the deflection slot and abuts against the sliding side 34 of the deflection slot.

The shift lever 74 continues to rotate, and the sliding side 34 inclines towards the ground in the circumferential direction, so that the bending core 3 moves upwards under the action of the supporting force of the shift lever 74 and gradually protrudes out of the rotary table 2 until the bottom end of the bending core 3 moves onto the shift lever 74, so that the bending core 3 can be used for the bending test of the steel bars.

In addition, since the distance between each sliding side 34 to the corresponding fixed side 33 becomes gradually larger in the direction away from the second rotating rod 73, each bending core 3 can be sequentially moved upward in the direction away from the second rotating rod 73 under the continued pushing of the shift lever 74.

Referring to fig. 5, 6 and 8, when the device is used for testing reinforcing steel bars with different diameters, a worker only needs to adjust the rotation angle of the deflector rod 74 through the control system, so that the bending cores 3 with different diameters can be adjusted to protrude out of the rotary table 2.

After the test is finished, the worker rotates the output shaft of the second motor 72 reversely through the control system, the second rotating rod 73 drives the shift lever 74 to rotate reversely, and the shift lever 74 moves back into the corresponding deflection slot from the bottom end of the bending core 3 and finally clings to the fixed side 33 of the deflection slot.

Referring to fig. 6 and 8, the shift lever 74 is rotatably sleeved with the roller 9, and the roller 9 converts sliding friction between the shift lever 74 and the sliding side 34 into rolling friction, so that the shift lever 74 can more smoothly push the bending core 3 to ascend.

Referring to fig. 6, 7 and 8, the second limiting grooves 35 are formed in the corresponding side walls of any two adjacent curved cores 3, a second limiting piece 8 is arranged between the two corresponding second limiting grooves 35, and the bottom end of the second limiting piece 8 is fixedly connected to the second bearing plate 71. The arrangement of the second limiting sheet 8 realizes circumferential limiting on two adjacent bending cores 3, so that the possibility of relative rotation between the two adjacent bending cores 3 is reduced.

Referring to fig. 6 and 7, in this embodiment, the same design as that in embodiment 1 is adopted between the outer side wall of the largest-diameter curved core 3 and the workbench 1, that is, the outer side wall of the largest-diameter curved core 3 is provided with a vertical first limiting strip 6, and the workbench 1 is provided with a first limiting groove for the vertical sliding of the first limiting strip 6.

Through the sliding fit of first spacing strip 6 and first spacing groove, realize spacingly to each curved core 3, when reducing second bull stick 73 and rotating, drive each curved core 3 and rotate in step, lead to each curved core 3 to be difficult to the possibility of salient carousel 2 in proper order.

The implementation principle of the embodiment 2 is as follows: before the detection is started, the bottom surface of each curved core 3 is pressed against the second bearing plate 71, and the top surface of each curved core 3 is flush with the top surface of the rotating disc 2, at this time, the shift lever 74 is tightly attached to the fixed side 33 of the corresponding deflection slot.

When the device is used for testing reinforcing steel bars with different diameters, a worker only needs to adjust the rotation angle of the deflector rod 74 through the control system, so that the bending cores 3 with different diameters can be adjusted to protrude out of the turntable 2.

When the output shaft of the second motor 72 rotates reversely, the second rotating rod 73 drives the shift lever 74 to rotate reversely, the shift lever 74 moves back into the corresponding deflection slot from the bottom end of the curved core 3 and finally clings to the fixed side 33 of the deflection slot, and each curved core 3 can descend sequentially along the direction close to the second rotating rod 73.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a can intelligence trade reinforcing bar bending test machine of core, include workstation (1), rotate connect in carousel (2) of workstation (1), its characterized in that: vertical slip is worn to be equipped with a plurality of curved cores (3) on carousel (2), and is a plurality of the coaxial setting of curved core (3) just by interior and arrange in proper order outward, still be equipped with in workstation (1) and be used for the drive the lifting unit that curved core (3) go up and down.

2. The steel bar bending tester capable of intelligently changing the core according to claim 1, wherein: the two adjacent bent cores (3) are in running fit, the lifting assembly comprises a first bearing plate (41) positioned in the workbench (1) and a first motor (42) connected below the first bearing plate (41), an output shaft of the first motor (42) penetrates through the first bearing plate (41) and is connected with a first rotating rod (43), the first rotating rod (43) and the bent cores (3) with the largest diameters are excluded, bulges (44) are arranged on the inner side walls of the rest bent cores (3), a spiral groove (31) for sliding corresponding to the bulges (44) is formed in the inner wall of each bent core (3), the bottom ends of the spiral grooves (31) are closed, sliding grooves (32) are vertically formed in the inner side walls of the rest bent cores (3) except the bent core (3) with the smallest diameter, the bottom ends of the sliding grooves (32) are closed, and the top ends of the sliding grooves are communicated with the upper surfaces of the corresponding bent cores (3), the top ends of the spiral grooves (31) are communicated with the corresponding sliding grooves (32).

3. The steel bar bending tester capable of intelligently changing the core according to claim 2, wherein: the bulges (44) are arranged in a hemispherical shape.

4. The steel bar bending tester capable of intelligently changing the core according to claim 2, wherein: the first bearing plate (41) is provided with a plurality of annular electromagnets (5), one electromagnet (5) corresponds to one bent core (3) and the electromagnet (5) is located below the bent core (3), the electromagnet (5) is used for repelling the bent core (3) correspondingly, and the electromagnets (5) are electrically connected with the first motor (42) through a control system.

5. The steel bar bending tester capable of intelligently changing the core according to claim 1, wherein: the diameter is the biggest be equipped with vertical first spacing (6) on the lateral wall of curved core (3), it has the confession to open on workstation (1) first spacing groove that first spacing (6) vertically slided.

6. The steel bar bending tester capable of intelligently changing the core according to claim 1, wherein: the driving assembly comprises a second bearing plate (71) arranged in the workbench (1) and a second motor (72) arranged below the second bearing plate (71), an output shaft of the second motor (72) penetrates through the second bearing plate (71) and is coaxially connected with a second rotating rod (73), a shift lever (74) is arranged on the outer side wall of the second rotating rod (73), a deflection groove is formed between the inner side wall and the outer side wall of each bent core (3), one side of each deflection groove is a fixed side (33), the other side of each deflection groove is a sliding side (34), the fixed sides (33) of the deflection grooves are arranged in a collinear manner, the distance between the sliding side (34) corresponding to the fixed side (33) is gradually increased along the direction far away from the second rotating rod (73), and the sliding side (34) is inclined downwards opposite to the corresponding fixed side (33), the shift lever (74) is in sliding fit with each sliding side (34).

7. The steel bar bending tester capable of intelligently changing the core according to claim 6, wherein: any adjacent two second spacing grooves (35) are formed in the side wall corresponding to the bent core (3), corresponding two second spacing pieces (8) are arranged between the second spacing grooves (35), and the bottom ends of the second spacing pieces (8) are fixedly connected to the second bearing plate (71).

8. The steel bar bending tester capable of intelligently changing the core according to claim 6, wherein: and a rolling sleeve (9) is rotatably sleeved on the shifting lever (74).