CN116046523A - Steel wire rope fatigue resistance testing system utilizing magnetic field change - Google Patents

Abstract

The invention belongs to the technical field of steel wire rope fatigue detection, and discloses a steel wire rope fatigue resistance testing system utilizing magnetic field change. According to the invention, the transmission liquid is pressurized by the resilience force generated by extrusion, so that the three piston columns are driven to synchronously move along the radial direction of the steel wire rope, the axes of the adapting ring, the magnetic sensor and the upper side part of the steel wire rope are kept collinear, at the moment, even if the steel wire rope changes in a tiny position, the magnetic sensor can synchronously move under the driving of the adapting wheel, the piston columns and the adapting ring, and the detection position is kept unchanged, so that the change of a detection test variable is avoided, and the detection precision is improved.

Description

A Steel Wire Rope Fatigue Test System Using Magnetic Field Variation

technical field

The invention belongs to the technical field of steel wire rope fatigue detection, and specifically relates to a steel wire rope fatigue resistance test system utilizing changes in a magnetic field.

Background technique

The steel wire rope is a helical steel wire bundle twisted together with steel wires that meet the mechanical properties. It is used in the lifting module of mechanical equipment. It has extremely strong structural strength and tensile limit, and provides mechanical equipment with lifting, Traction, tension and load-bearing functions, the steel wire rope needs to be subjected to a certain load when it leaves the factory, and the fatigue resistance test of the steel wire rope is completed; the test system in the prior art mainly uses the principle of magnetic field change to realize the measurement function: the wire rope around it after power-on A magnetic field will be generated, and the magnetic field change is captured by setting a magnetic sensor, and then transmitted to the computer through the A/D swivel circuit. When the wire rope is stretched, its cross-sectional surface will be reduced, resulting in a change in the current, and the corresponding magnetic field will also The test system in the prior art mainly relies on the magnetic sensor to capture the magnetic signal, which is generally fixed, and the diameter value of the steel wire rope will change slightly during the tensile test, resulting in a slight change in the distance from the sensor. The change cannot be seen by the naked eye, causing the magnetic sensor to deviate when collecting magnetic field data, which reduces the detection accuracy of the system.

Contents of the invention

The purpose of the present invention is to provide a steel wire rope fatigue resistance test system using magnetic field changes, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: a steel wire rope fatigue resistance test system using magnetic field changes, including a workbench and a steel wire rope. Guide wheels are fixedly installed on both sides of the workbench. The inner wall is rotatably provided with a stretching mechanism, and the top of the workbench is press-fitted with a moving frame, and the top of the moving frame is fixedly installed with a connecting cylinder, and the inside of the connecting cylinder is guided by a No. 1 spring and connected to a No. 1 connecting column. The bottom of the No. 1 connecting column is fixedly connected with a connecting block and an adapter ring, the inner ring surface of the adapter ring is fixedly connected with an accommodation column, the inner wall of the adapter ring is provided with an extrusion column, and the accommodation column There is a No. 2 spring and a piston rod in the internal movable sleeve, and the other end of the piston rod is fixedly connected with an adapter wheel, and the inner cavity of the adapter ring and the receiving column is connected and filled with transmission fluid. The guide wheel is plugged and installed inside the stretching mechanism. The steel wire rope runs through the inner ring surface of the adapter ring and is pressed into contact with the adapter wheel. The left side of the adapter ring is fixedly connected with a magnetic sensitive sensor.

Preferably, the stretching mechanism includes a motor and two support shafts located on the left and right sides of the output shaft of the motor in turn, the outer surface of the motor is fixedly equipped with a No. 1 gear, and the front sides of the outer surfaces of the two support shafts are fixed The No. 2 gear is installed, the No. 1 gear and the No. 2 gear are meshed for transmission, the outer surface of the support shaft is fixedly sleeved with a sleeve, and the left and right sides of the outer surface of the two sleeves are provided with The slot is placed, and the two ends of the wire rope are movably inserted in the slot.

Preferably, the number of the guide wheels is four, which are distributed on the left and right sides of the workbench in turn, and the steel wire rope is movably connected to the outer surface of the guide wheels.

Preferably, the front and rear sides of the top of the workbench are provided with eight threaded holes equally spaced in the transverse direction, and the front and rear sides of the mobile frame are press-fitted on the top of the workbench through bolts and threaded holes.

Preferably, a No. 1 spring is elastically connected to the inside of the connecting cylinder, and the No. 1 connecting post is elastically supported inside the connecting barrel by the No. 1 spring. The upper and lower sides of the connecting block are sequentially matched with the No. 1 connecting post and Ring fixed connection.

Preferably, the number of the accommodating columns is three and fixedly connected to the inner ring surface of the adapter ring at an equal angle, the No. 2 spring is movably sleeved on the outer surface of the piston column and stretched, and the two The two ends of the No. spring are elastically connected with the piston rod and the containing rod in turn, and the outer surfaces of the three adapter wheels are fitted in contact with the outer surfaces of the steel wire rope.

Preferably, the number of the extruding columns is three and is glued and distributed on the inner wall of the adapter ring at an equal angle. The extruding columns are made of rubber blocks. The longitudinal section of the extruding columns is fan-shaped and The opening and closing angle is 80°, and a sealing cavity is opened inside the adapter ring, and the transmission fluid is sealed and filled in the sealing cavity through the extruding column and the containing column.

Preferably, the number of the No. 2 connecting posts is three, and the three No. 2 connecting posts are equiangularly distributed on the left side of the adapter ring, and the left and right sides of the No. 2 connecting posts are connected with the magnetic sensor Securely connect with the adapter ring.

Preferably, there are three connecting cylinders distributed at equal intervals on the top of the moving frame, and the No. 1 spring is compressed and arranged inside the connecting cylinders.

Preferably, the No. 1 gear is located at the front end of the output shaft of the motor, and the diameter of the No. 1 gear is smaller than that of the No. 2 gear.

The beneficial effects of the present invention are as follows:

1. In the present invention, the adapter wheel is arranged to squeeze and contact with the steel wire rope, so that the adapter wheel drives the piston column to move to the inside of the accommodation column, and the piston column presses the transmission fluid inward and transmits the pressure to the extrusion column through its flow characteristics , the three adapter wheels all transmit the pressure equally through the piston rod, so that the axis of the adapter ring and the axis of the upper part of the wire rope are always collinear, so that the second connecting column and the magnetic sensor connected to the adapter ring can also be connected with the The relative position of the steel wire rope remains unchanged all the time. When the diameter of the steel wire rope shrinks invisible to the naked eye, the extrusion column exerts pressure on the transmission fluid through the rebound force generated by being squeezed, and drives the three piston cylinders to synchronize along the radial direction of the steel wire rope. Move to keep the axes of the adapter ring, the magnetic sensor and the upper part of the wire rope collinear. At this time, even if the wire rope changes slightly, the magnetic sensor can be driven by the adapter wheel, the piston rod and the adapter ring. Synchronous movement keeps the detection position unchanged, thereby avoiding changes in detection test variables, which is conducive to improving detection accuracy.

2. The mobile frame is flexibly fixed on the top of the workbench by setting bolts and threaded holes, and the magnetic sensor is driven by the adapter ring to move along the axis of the wire rope to any point on the upper side of the wire rope, and then the bolts and the threaded holes are aligned. And re-fix the mobile frame to expand the detection range of the device. The surface of the steel wire rope can realize the fatigue resistance test at multiple points, and through the cooperation of the adapter wheel, the piston column, the transmission fluid and the extrusion column and the adapter ring, the magnetic The axial direction of the sensitive sensor and the axial direction of the upper side of the steel wire rope are always kept in line, so as to avoid the increase of variables during detection and improve the flexibility of detection.

3. When the wire rope drives the adapter wheel and the adapter ring to move, in order to avoid the influence of the irregular movement of the adapter ring on the movement stability of the adapter ring, a connecting block is provided to connect with the No. 1 connecting column. When the ring moves, restrict the radial movement of the adapter ring along the No. 1 connecting column, and only allow the adapter ring belt connection block and the No. 1 connecting column to move up and down in a straight line. When the steel wire rope is stretched straight and the adapter wheel drives the adapter ring and When the magnetic sensor keeps moving synchronously, the connecting cylinder exerts pressure on the No. 1 connecting column to overcome the power generated by the adapter ring itself being driven by the wire rope, and improve the stability of the adapter ring and the magnetic sensor.

Description of drawings

Fig. 1 is the front appearance schematic diagram of structure of the present invention;

Fig. 2 is the side structure schematic diagram of structure of the present invention;

Fig. 3 is the enlarged schematic view of the structure at A place in Fig. 2 of the present invention;

Fig. 4 is a structural schematic diagram of the connecting cylinder, No. 1 connecting column, connecting block, stretching mechanism, guide wheel, steel wire rope, adapter ring, No. 2 connecting column, magnetic sensor and containing column of the present invention;

Fig. 5 is the front sectional schematic diagram of structure of the present invention;

Figure 6 is an enlarged schematic view of the structure at B in Figure 5 of the present invention;

Fig. 7 is the side sectional schematic diagram of structure of the present invention;

Figure 8 is an enlarged schematic view of the structure at C in Figure 7 of the present invention;

Fig. 9 is a schematic diagram of the separation of the connecting cylinder, the No. 1 spring, the No. 1 connecting post, the connecting block, the adapter ring, the No. 2 connecting post, the magnetic sensor, the containing post, the No. 2 spring and the adapter wheel of the present invention;

Fig. 10 is a schematic diagram of the separation of the adapter ring, accommodation column, No. 2 spring, piston column, adapter wheel and extrusion column of the present invention;

Fig. 11 is an isolated schematic diagram of the stretching mechanism of the present invention.

In the figure: 1. Workbench; 2. Threaded hole; 3. Bolt; 4. Mobile frame; 5. Connecting cylinder; 6. No. 1 spring; 7. No. 1 connecting column; 8. Connecting block; ; 91, motor; 92, No. 1 gear; 93, support shaft; 94, No. 2 gear; 95, sleeve; 96, placement groove; 10, guide wheel; 11, wire rope; 12, adapter ring; 121, seal cavity; 13, No. 2 connecting post; 14, magnetic sensor; 15, containing post; 16, No. 2 spring; 17, piston post; 18, adapter wheel; 19, transmission fluid; 20, extruding post.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 11, the embodiment of the present invention provides a steel wire rope fatigue resistance test system using magnetic field changes, including a workbench 1 and a steel wire rope 11, and guide wheels 10 are fixedly installed on the upper and lower sides of the workbench 1, The inner wall of the workbench 1 is provided with a stretching mechanism 9, the top of the workbench 1 is press-fitted with a moving frame 4, and the top of the moving frame 4 is fixedly installed with a connecting cylinder 5, and the inside of the connecting cylinder 5 is guided and connected by the No. 1 spring 6. There is a connecting column 7, the bottom of the connecting column 7 is fixedly connected with the connecting block 8 and the adapter ring 12, the inner ring surface of the adapter ring 12 is fixedly connected with the receiving column 15, and the inner wall of the adapter ring 12 is provided with extrusion Column 20, No. 2 spring 16 and piston column 17 are movably sleeved inside the accommodation column 15, and the other end of piston column 17 is fixedly connected with an adapter wheel 18, and the inner chamber of the adapter ring 12 and the accommodation column 15 is connected and filled with transmission liquid 19, the two ends of the steel wire rope 11 are plugged and arranged inside the stretching mechanism 9 through the guide wheel 10, the steel wire rope 11 runs through the inner ring surface of the adapter ring 12 and squeezes into contact with the adapter wheel 18, and the left side of the adapter ring 12 A magnetic sensor 14 is fixedly connected to the No. 2 connecting column 13;

When the system is working, the steel wire rope 11 passes through the inner ring surface of the adapter ring 12 and the magnetic sensor 14 along its axial direction and laterally, and then contacts the steel wire rope 11 through the adapter wheel 18, and then drives the piston rod 17 to the inside of the accommodation rod 15 Moving, the second spring 16 is stretched to provide the reset power of the piston rod 17, the piston rod 17 presses the transmission fluid 19 inward and transmits the pressure to the extrusion rod 20 through its flow characteristics, and the three adapter wheels 18 pass through The piston rod 17 transmits the pressure equally, so that the axis of the adapter ring 12 is always in line with the axis of the upper part of the steel wire rope 11, so that the second connecting column 13 and the magnetic sensor 14 connected with the adapter ring 12 can also be connected with the wire rope 11. Always keep the relative position unchanged, when the steel wire rope 11 is not stretched, the magnetic field signal generated by the electrified steel wire rope 11 is captured by the magnetic sensor 14, and the magnetic field signal is converted into a digital signal through the A/D conversion circuit and transmitted to the computer , to obtain the magnetic field strength information of the steel wire rope 11; when the stretching mechanism 9 starts, it will continue to stretch the steel wire rope 11 to both ends, and the steel wire rope 11 will move synchronously to both ends during this process. On the one hand, it will drive the adapter wheel 18 to rotate to adapt At the same time, the diameter of the steel wire rope 11 shrinks invisible to the naked eye. At this time, the extrusion column 20 exerts pressure on the transmission fluid 19 through the rebound force generated by being squeezed, and drives the three piston columns 17 to synchronize along the radial direction of the steel wire rope 11. Move, drive the adapter wheel 18 to always squeeze the outer surface of the wire rope 11, and keep the axes of the adapter ring 12, the magnetic sensor 14 and the upper part of the wire rope 11 collinear. At this time, even if the wire rope 11 changes slightly , the magnetic sensor 14 can also move synchronously under the drive of the adapter wheel 18, the piston rod 17 and the adapter ring 12 to keep the detection position unchanged, thereby avoiding the change of the detection test variable and improving the detection accuracy.

Wherein, the stretching mechanism 9 comprises a motor 91 and two support shafts 93 positioned at the left and right sides of the output shaft of the motor 91 successively. The outer surface of the motor 91 is fixedly equipped with a No. 1 gear 92, and the front sides of the two support shafts 93 outer surfaces are all fixed. The No. 2 gear 94 is installed, the No. 1 gear 92 and the No. 2 gear 94 are meshed for transmission, the outer surface of the support shaft 93 is fixedly sleeved with a sleeve 95, and the left and right sides of the left and right sleeve 95 outer surfaces are provided with Place the groove 96, and the two ends of the steel wire rope 11 are movably inserted in the inside of the groove 96;

After the motor 91 is started, the No. 1 gear 92 and the No. 2 gear 94 drive the two supporting shafts 93 to rotate synchronously, and then drive the sleeve 95 to rotate. When the sleeve 95 rotates, the two ends of the steel wire rope 11 under radial force will not break away from the inside of the placement groove 96, and when the sleeve 95 rotates, the two ends of the steel wire rope 11 will be wound synchronously to realize the protection of the steel wire rope 11. Stretch detection function.

Wherein, the quantity of guide wheel 10 is four and is distributed on the left and right sides of workbench 1 successively, and steel wire rope 11 is movably connected on the outer surface of guide wheel 10;

The guide wheel 10 is responsible for providing support for the steel wire rope 11 and maintaining its guiding function. When the steel wire rope 11 is stretched and moved, the guide wheel 10 keeps the steel wire rope 11 straight and receives detection.

Among them, the front and rear sides of the top of the workbench 1 are provided with eight threaded holes 2 distributed at equal intervals in the transverse direction, and the front and rear sides of the mobile frame 4 are mounted on the top of the workbench 1 through bolts 3 and threaded holes 2;

The bolt 3 is used to fix and disassemble the mobile frame 4, the mobile frame 4 is fixed on the top of the workbench 1, and the magnetic sensor 14 is driven by the adapter ring 12 to move to any point on the upper side of the steel wire rope 11 along the axis of the steel wire rope 11, and then the The bolt 3 is aligned with the threaded hole 2 and the mobile frame 4 is re-fixed, thereby expanding the detection range of the device. The surface of the steel wire rope 11 can realize the fatigue resistance test of multiple points, and through the adapter wheel 18, the piston rod 17, the transmission fluid 19 cooperates with the extrusion column 20 and the adapter ring 12, the axial direction of the magnetic sensor 14 and the axial direction of the upper side of the steel wire rope 11 are always kept in line, thereby avoiding the increase of variables during detection and improving the flexibility of detection.

Wherein, the inside of the connecting cylinder 5 is elastically connected with a No. 1 spring 6, and the No. 1 connecting column 7 is elastically supported inside the connecting tube 5 by the No. 1 spring 6. The upper and lower sides of the connecting block 8 are sequentially matched with the No. 1 connecting column 7 and Ring 12 is fixedly connected;

When the wire rope 11 drives the adapter wheel 18 and the adapter ring 12 to move, in order to avoid the influence of the irregular movement of the adapter ring 12 on the movement stability of the adapter ring 12, a connection block 8 and a No. connection, when the adapter ring 12 moves, the radial movement of the adapter ring 12 along the No. When stretching straight and driving the adapter ring 12 and the magnetic sensor 14 to move synchronously through the adapter wheel 18, press the No. 1 connecting column 7 through the connecting cylinder 5 to overcome the problem that the adapter ring 12 itself is driven by the wire rope 11 The dynamic force improves the stability of the adapter ring 12 and the magnetic sensor 14.

Wherein, the number of containing columns 15 is three and is fixedly connected to the inner ring surface of the adapter ring 12 at an equal angle. The second spring 16 is movably sleeved on the outer surface of the piston column 17 and is stretched. The second spring 16 The two ends of each are elastically connected with the piston rod 17 and the containing rod 15 in turn, and the outer surfaces of the three adapter wheels 18 are adapted to contact with the outer surfaces of the steel wire rope 11;

The second spring 16 is sleeved on the outer surface of the piston rod 17, but it is not responsible for the feedback when the piston rod 17 is stressed. When the steel wire rope 11 contacts the three adapter wheels 18, it will drive the three adapter wheels 18 to move synchronously. By driving the piston column 17 to move to the interior of the containing column 15, the flowing transmission fluid 19 is compressed and the extrusion column 20 is simultaneously compressed, so that the extrusion column 20 is deformed and the transmission fluid 19 is pressurized, and the adapter wheel 18 is kept in the process of pressing the wire rope 11 The stability of the relative position of the surface.

Wherein, the quantity of extruding columns 20 is three and is glued and distributed on the inner wall of the adapter ring 12 at an equal angle. The extruding columns 20 are made of rubber blocks. 80°, the inside of the adapter ring 12 is provided with a sealing cavity 121, and the transmission fluid 19 is sealed and filled in the inside of the sealing cavity 121 through the extrusion column 20 and the containing column 15;

As shown in Figures 7 and 8, when the extrusion column 20 made of rubber block is pressed and deformed by the piston column 17 through the transmission fluid 19, it can simultaneously generate the same pressure on the three piston columns 17, thus ensuring that the adapter ring 12 The axis and the axis of the steel wire rope 11 are collinear.

Wherein, the number of No. 2 connecting posts 13 is three, and the three No. 2 connecting posts 13 are equiangularly distributed on the left side of the adapter ring 12. Matching ring 12 is fixedly connected;

The second connecting column 13 is used for fixedly connecting the magnetic sensor 14 , for connecting the adapter ring 12 and the magnetic sensor 14 , so that the adapter ring 12 and the magnetic sensor 14 are integrated.

Wherein, the number of connecting cylinders 5 is three and distributed at the top of the moving frame 4 at equal intervals, and the No. 1 spring 6 is compressed and arranged inside the connecting cylinders 5;

The No. 1 spring 6 supports and connects the adapter ring 12 and the magnetic sensor 14 by cooperating with the No. 1 spring 6 , the No. 1 connecting column 7 and the connecting block 8 , and provides a corresponding guiding function when the adapter ring 12 moves.

Wherein, the No. 1 gear 92 is positioned at the front end of the output shaft of the motor 91, and the diameter of the No. 1 gear 92 is smaller than the diameter of the No. 2 gear 94;

When the No. 1 gear 92 is driven by the motor 91 to rotate, it can mesh with the No. 2 gear 94 to drive and rotate, and reduce the rotation and increase the torque.

Working principle and usage process:

First, the steel wire rope 11 to be tested is passed through the inner ring surface of the adapter ring 12 and the second connecting column 13, and the outer surface of the steel wire rope 11 contacts with the adapter wheel 18 and generates a squeezing force, driving the piston rod 17 to the receiving column 15. The internal movement, the No. 2 spring 16 is stretched, the transmission fluid 19 located inside the accommodation column 15 is squeezed and flows by the moving piston column 17, and pressurizes the extrusion column 20, so that the extrusion column 20 is subjected to extrusion force and generates The pressure of the deformation transmission fluid 19 rises, and after being guided by the guide wheel 10, the two ends of the wire rope 11 are sequentially inserted in the inside of the left and right placement grooves 96 and fixed;

Then, the terminal of the magnetic sensor 14 is connected to the A/D conversion circuit and connected to the computer. When the steel wire rope 11 is not stretched: the steel wire rope 11 is energized and a magnetic field is generated. At this time, the magnetic sensor 14 captures the magnetic field signal And through the A/D conversion circuit into a digital signal and then transmitted into the computer and get the magnetic field strength information;

During detection: start the motor 91 and drive the No. 1 gear 92 and the No. 2 gear 94 to rotate, and drive the support shaft 93 and the sleeve 95 to rotate, so that the rotating sleeve 95 will wrap and stretch the steel wire rope 11, so that the steel wire rope 11 is Pull and straighten. At this time, the straightened wire rope 11 on the upper side will drive the adapter wheel 18 and the adapter ring 12 to move as a whole, so that the axes of the adapter ring 12 and the magnetic sensor 14 are in line with the axis of the wire rope 11. At this time, the magnetic sensor 14 detects the magnetic field intensity information when the steel wire rope 11 is stretched again, because the adapter wheel 18 drives the piston rod 17 to move to the inside of the receiving rod 15 and presses the flowing transmission fluid 19 against the extrusion rod 20. Generate pressure so that the adapter ring 12 and the steel wire rope 11 in the stretching movement can always maintain a stable relative position. When the adapter ring 12 moves up and down, the connecting block 8 drives the No. 1 connecting column 7 along the inside of the connecting cylinder 5 Move up and down, so that the No. 1 spring 6 is stretched or compressed;

Finally, when the tensile strength of different positions of the steel wire rope 11 needs to be detected, the bolt 3 is removed, the moving frame 4 is moved to the left or right, and then the bolt 3 is re-fixed on the moving frame 4, so that flexible detection can be realized. The input power can be an external student power supply.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. A steel wire rope fatigue resistance test system utilizing a magnetic field variation, comprising a workbench (1), a steel wire rope (11), the upper and lower sides of the workbench (1) are fixedly equipped with guide wheels (10), characterized in that : the inner wall of the workbench (1) is rotatably provided with a stretching mechanism (9), the top of the workbench (1) is press-fitted with a mobile frame (4), and the top of the mobile frame (4) is fixedly installed There is a connecting cylinder (5), the inside of the connecting cylinder (5) is guided and connected to a No. 1 connecting column (7) through a No. 1 spring (6), and the bottom of the No. 1 connecting column (7) is fixedly connected with a connecting block ( 8) and the adapter ring (12), the inner ring surface of the adapter ring (12) is fixedly communicated with the containing column (15), and the inner wall of the adapter ring (12) is provided with an extrusion column (20), The inner movable socket of the containing column (15) is provided with a No. 2 spring (16) and a piston column (17), and the other end of the piston column (17) is fixedly connected with an adapter wheel (18). The inner cavity of the ring (12) and the receiving column (15) is connected and filled with transmission fluid (19), and the two ends of the steel wire rope (11) are inserted and arranged inside the stretching mechanism (9) through the guide wheels (10), so that The steel wire rope (11) runs through the inner ring surface of the adapter ring (12) and squeezes into contact with the adapter wheel (18), and the left side of the adapter ring (12) is fixedly connected with a Magnetic sensor (14). 2. A steel wire rope fatigue resistance test system utilizing magnetic field changes according to claim 1, characterized in that: said stretching mechanism (9) includes a motor (91) and a motor (91) output shaft left and right sides Two supporting shafts (93), the outer surface of the motor (91) is fixedly equipped with a No. 1 gear (92), and the front sides of the outer surfaces of the two supporting shafts (93) are fixedly equipped with a No. 2 gear (94) , the No. 1 gear (92) is meshed with the No. 2 gear (94) for transmission, the outer surface of the support shaft (93) is fixedly sleeved with a sleeve (95), and the left and right two sleeves (95) are Both the left side and the right side of the surface are provided with placement grooves (96), and the two ends of the steel wire rope (11) are movably inserted into the placement grooves (96). 3. A steel wire rope fatigue resistance test system utilizing magnetic field changes according to claim 1, characterized in that: the number of the guide wheels (10) is four and they are sequentially distributed on the left and right sides of the workbench (1) , the steel wire rope (11) is movably wound around the outer surface of the guide wheel (10). 4. A kind of steel wire rope fatigue resistance test system utilizing magnetic field variation according to claim 1, it is characterized in that: the front and rear sides of the top of the workbench (1) are provided with eight threaded holes ( 2), the front and rear sides of the mobile frame (4) are press-fitted on the top of the workbench (1) through bolts (3) and threaded holes (2). 5. A kind of steel wire rope fatigue resistance test system utilizing magnetic field variation according to claim 1, it is characterized in that: the inner elastic connection of described connecting cylinder (5) has a No. 1 spring (6), and described No. 1 connecting post ( 7) The No. 1 spring (6) is elastically supported inside the connecting cylinder (5), and the upper and lower sides of the connecting block (8) are sequentially fixedly connected with the No. 1 connecting post (7) and the adapter ring (12). 6. A steel wire rope fatigue resistance test system utilizing a magnetic field change according to claim 1, characterized in that: the number of the containing columns (15) is three and fixedly connected to the adapter ring (12) at an equal angle The inner ring surface of the No. 2 spring (16) is movably sleeved on the outer surface of the piston rod (17) and is stretched, and the two ends of the No. 2 spring (16) are sequentially connected with the piston rod (17) and The accommodation column (15) is elastically connected, and the outer surfaces of the three adapter wheels (18) are adapted to contact with the outer surfaces of the steel wire rope (11). 7. A kind of steel wire rope fatigue resistance test system utilizing magnetic field variation according to claim 1, is characterized in that: the quantity of described extruding column (20) is three and is equiangular adhesive distribution in adapter ring ( 12), the extrusion column (20) is made of rubber blocks, the longitudinal section shape of the extrusion column (20) is fan-shaped and the opening and closing angle is 80 °, and the adapter ring (12) A sealed cavity (121) is opened inside, and the transmission fluid (19) is sealed and filled in the sealed cavity (121) through the extruding column (20) and the containing column (15). 8. A kind of steel wire rope fatigue resistance test system utilizing magnetic field variation according to claim 1, is characterized in that: the quantity of described No. 2 connecting columns (13) is three, and three described No. 2 connecting columns (13) ) are equiangularly distributed on the left side of the adapter ring (12), and the left and right sides of the No. 2 connecting column (13) are fixedly connected with the magnetic sensor (14) and the adapter ring (12) in turn. 9. A steel wire rope fatigue resistance test system utilizing magnetic field changes according to claim 1, characterized in that: the number of the connecting cylinders (5) is three and distributed at equal intervals on the top of the moving frame (4) , the No. 1 spring (6) is compressed and arranged inside the connecting cylinder (5). 10. A steel wire rope fatigue resistance test system utilizing magnetic field variation according to claim 2, characterized in that: the No. 1 gear (92) is located at the front end of the output shaft of the motor (91), and the No. 1 gear (92) ) diameter value is less than the diameter value of No. two gear (94).

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