A steel wire rope fatigue resistance testing system utilizing magnetic field changes

Abstract

The present invention belongs to the technical field of wire rope fatigue detection, and discloses a wire rope fatigue resistance test system using magnetic field changes, including a workbench and a wire rope. Guide wheels are fixedly installed on both the upper and lower sides of the workbench. A stretching mechanism is rotatably arranged inside the workbench. A moving frame is press-fitted and installed on the top of the workbench. A connecting cylinder is fixedly installed on the top of the moving frame. A first connecting column is guided and connected inside the connecting cylinder through a first spring. In the present invention, the resilience generated by being extruded presses on the transmission fluid, driving the three piston columns to move synchronously along the radial direction of the wire rope, keeping 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 undergoes a slight position change, the magnetic sensor can move synchronously under the drive of the adapter wheel, the piston column, and the adapter ring, keeping the detection position unchanged, thereby avoiding changes in the detection test variables and being beneficial to improving the detection accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of wire rope fatigue detection, and particularly relates to a wire rope fatigue resistance test system using magnetic field change. Background Technique

[0002] A wire rope is a helical wire bundle formed by twisting multiple wires that meet mechanical properties together. It is used in the lifting module of mechanical equipment and has extremely strong structural strength and tensile limit, providing functions of lifting, traction, tensioning, and load bearing for mechanical equipment. When the wire rope leaves the factory, a certain load needs to be applied to it to complete the fatigue resistance test of the wire rope. The existing test systems mainly use the principle of magnetic field change to achieve the measurement function: a magnetic field will be generated around the energized wire rope. By setting a magnetic sensor to capture the magnetic field change and then transmitting it to a computer through an A / D conversion circuit. Since the cross-sectional area of the wire rope decreases when it is stretched, the current changes, and accordingly the magnetic field also changes. The existing test systems mainly rely on magnetic sensors to capture magnetic signals, and they are generally fixedly arranged. When the wire rope is stretched and tested, the diameter value will change slightly, resulting in a slight change in the distance from the sensor, which is invisible to the naked eye, causing deviation in the magnetic sensor when collecting magnetic field data and reducing the detection accuracy of the system. Summary of the Invention

[0003] The purpose of the invention is to provide a wire rope fatigue resistance test system using magnetic field change to solve the problems put forward in the above background technique.

[0004] To achieve the above purpose, the invention provides the following technical solution: A wire rope fatigue resistance test system using magnetic field change, including a workbench and a wire rope. Guide wheels are fixedly installed on both the upper and lower sides of the workbench. A stretching mechanism is rotatably arranged inside the workbench. A moving frame is press-fitted and installed on the top of the workbench. A connecting cylinder is fixedly installed on the top of the moving frame. Inside the connecting cylinder, a first connecting column is guided and connected through a first spring. The bottom of the first connecting column is fixedly connected with a connecting block and an adapter ring. The inner ring surface of the adapter ring is fixedly communicated with a receiving column. An extrusion column is arranged on the inner wall of the adapter ring. A second spring and a piston column are movably sleeved inside the receiving column. The other end of the piston column is fixedly connected with an adapter wheel. The inner cavities of the adapter ring and the receiving column are filled with transmission fluid in communication. Both ends of the wire rope are inserted into the stretching mechanism through the guide wheels. The wire rope penetrates the inner ring surface of the adapter ring and is in extrusion contact with the adapter wheel. The left side of the adapter ring is fixedly connected with a magnetic sensor through a second connecting column.

[0005] Preferably, the stretching mechanism includes a motor and two support shafts successively located on the left and right sides of the output shaft of the motor. A first gear is fixedly installed on the outer surface of the motor. A second gear is fixedly installed on the front side of the outer surface of each of the two support shafts. The first gear is in meshing transmission with the second gear. A sleeve is fixedly sleeved on the outer surface of the support shaft. Placing grooves are formed on the left and right sides of the outer surfaces of the left and right sleeves. The two ends of the steel wire rope are movably inserted into the placing grooves.

[0006] Preferably, the number of the guide wheels is four and they are successively distributed on the left and right sides of the workbench. The steel wire rope is movably wound around the outer surface of the guide wheel.

[0007] Preferably, eight equally spaced threaded holes are formed on the front and rear sides of the top of the workbench. The front and rear sides of the moving frame are press-fitted and installed on the top of the workbench through bolts and the threaded holes.

[0008] Preferably, a first spring is elastically connected inside the connecting cylinder. The first connecting column is elastically supported inside the connecting cylinder through the first spring. The upper and lower sides of the connecting block are fixedly connected to the first connecting column and the adapter ring in sequence.

[0009] Preferably, the number of the receiving columns is three and they are fixedly connected to the inner ring surface of the adapter ring at equal angles. The second spring is movably sleeved on the outer surface of the piston column and is stretched. The two ends of the second spring are elastically connected to the piston column and the receiving column in sequence. The outer surfaces of the three adapter wheels are in adaptive contact with the outer surface of the steel wire rope.

[0010] Preferably, the number of the extrusion columns is three and they are adhesively distributed at equal angles on the inner wall of the adapter ring. The extrusion column is made of a rubber block. The longitudinal cross-sectional shape of the extrusion column is a sector with an opening angle of 80°. A sealing cavity is formed inside the adapter ring. The transmission fluid is hermetically filled inside the sealing cavity through the extrusion column and the receiving column.

[0011] Preferably, the number of the second connecting columns is three. The three second connecting columns are distributed at equal angles on the left side of the adapter ring. The left and right sides of the second connecting column are fixedly connected to the magnetic sensor and the adapter ring in sequence.

[0012] Preferably, the number of the connecting cylinders is three and they are distributed at equal intervals on the top of the moving frame. The first spring is compressed and arranged inside the connecting cylinder.

[0013] Preferably, the first gear is located at the front end of the output shaft of the motor. The diameter value of the first gear is smaller than the diameter value of the second gear.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. In the present invention, by arranging an adaptation wheel in extrusion contact with a wire rope, the adaptation wheel drives a piston column to move inside a receiving column. The piston column presses the transmission fluid inward and transfers the pressure to an extrusion column through the flow characteristics of the transmission fluid. The three adaptation wheels evenly transfer the pressure through the piston columns, so that the axis of the adaptation ring and the axis of the upper part of the wire rope are always collinear. Thus, the second connecting column and the magnetic sensor connected to the adaptation ring can also always maintain a fixed relative position with the wire rope. When the diameter value of the wire rope undergoes an imperceptible reduction, the extrusion column exerts pressure on the transmission fluid through the resilience generated by being extruded, driving the three piston columns to move synchronously along the radial direction of the wire rope, and keeping the axes of the adaptation ring, the magnetic sensor, and the upper part of the wire rope collinear. At this time, even if the wire rope undergoes a slight position change, the magnetic sensor can also move synchronously under the drive of the adaptation wheel, the piston column, and the adaptation ring, maintaining the detection position unchanged, thereby avoiding changes in the detection test variables and being conducive to improving the detection accuracy.

[0016] 2. By arranging bolts and threaded holes, the moving frame is flexibly fixed on the top of the workbench. The adaptation ring drives the magnetic sensor to move along the axis of the wire rope to any point on the upper side of the wire rope. Then, align the bolts with the threaded holes and fix the moving frame again, thereby expanding the detection range of the device. Multiple points on the surface of the wire rope can be subjected to fatigue resistance tests. Moreover, through the cooperation of the adaptation wheel, the piston column, the transmission fluid, the extrusion column, and the adaptation ring, the axis of the magnetic sensor and the axis of the upper side of the wire rope always remain collinear, thereby avoiding an increase in variables during detection and improving the flexibility of detection.

[0017] 3. When the wire rope drives the adaptation wheel and the adaptation ring to move, in order to avoid the influence of the irregular movement of the adaptation ring on the movement stability of the adaptation ring, a connecting block is arranged to be connected with the first connecting column. When the adaptation ring moves, the movement of the adaptation ring along the radial direction of the first connecting column is restricted, and only the adaptation ring can drive the connecting block and the first connecting column to perform linear up-and-down movement. When the wire rope is straightened and drives the adaptation ring and the magnetic sensor to move synchronously through the adaptation wheel, pressure is exerted on the first connecting column through a connecting cylinder to overcome the power generated by the adaptation ring itself being driven by the wire rope, improving the stability of the adaptation ring and the magnetic sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front external view schematic diagram of the structure of the present invention;

[0019] Figure 2 is a side structure schematic diagram of the structure of the present invention;

[0020] Figure 3 For the present invention Figure 2 is an enlarged schematic diagram of the structure at A in

[0021] Figure 4Schematic diagram of the connection cylinder, first connection column, connection block, stretching mechanism, guide wheel, steel wire rope, adapter ring, second connection column, magnetic sensor and receiving column of the present invention;

[0022] Figure 5 Front sectional view of the structure of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at position B in the present invention;

[0024] Figure 7 Side sectional view of the structure of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at position C in the present invention;

[0026] Figure 9 Separation schematic diagram of the connection cylinder, first spring, first connection column, connection block, adapter ring, second connection column, magnetic sensor, receiving column, second spring and adapter wheel of the present invention;

[0027] Figure 10 Separation schematic diagram of the adapter ring, receiving column, second spring, piston column, adapter wheel and extrusion column of the present invention;

[0028] Figure 11 Separation schematic diagram of the stretching mechanism of the present invention.

[0029] In the figure: 1, workbench; 2, threaded hole; 3, bolt; 4, moving frame; 5, connection cylinder; 6, first spring; 7, first connection column; 8, connection block; 9, stretching mechanism; 91, motor; 92, first gear; 93, support shaft; 94, second gear; 95, sleeve; 96, placement groove; 10, guide wheel; 11, steel wire rope; 12, adapter ring; 121, sealing cavity; 13, second connection column; 14, magnetic sensor; 15, receiving column; 16, second spring; 17, piston column; 18, adapter wheel; 19, transmission fluid; 20, extrusion column. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figures 1 to 11As shown in the figure, an embodiment of the present invention provides a fatigue resistance test system for steel wire ropes using magnetic field changes, including a workbench 1 and a steel wire rope 11. Guide wheels 10 are fixedly installed on both the upper and lower sides of the workbench 1. A stretching mechanism 9 is rotatably arranged inside the inner wall of the workbench 1. A moving frame 4 is press-fitted and installed on the top of the workbench 1. A connecting cylinder 5 is fixedly installed on the top of the moving frame 4. Inside the connecting cylinder 5, a first connecting column 7 is connected through a first spring 6. The bottom of the first connecting column 7 is fixedly connected with a connecting block 8 and an adapter ring 12. The inner ring surface of the adapter ring 12 is fixedly communicated with a receiving column 15. An extrusion column 20 is arranged on the inner wall of the adapter ring 12. Inside the receiving column 15, a second spring 16 and a piston column 17 are movably sleeved. The other end of the piston column 17 is fixedly connected with an adapter wheel 18. The inner cavities of the adapter ring 12 and the receiving column 15 are filled with a transmission fluid 19. Both ends of the steel wire rope 11 are inserted into the stretching mechanism 9 through the guide wheels 10. The steel wire rope 11 passes through the inner ring surface of the adapter ring 12 and is in pressing contact with the adapter wheel 18. The left side of the adapter ring 12 is fixedly connected with a magnetic sensor 14 through a second connecting column 13;

[0032] When the system is working, the steel wire rope 11 is horizontally penetrated through the inner ring surfaces of the adapter ring 12 and the magnetic sensor 14 along its own axis. The adapter wheel 18 contacts the steel wire rope 11 and then drives the piston column 17 to move into the receiving column 15. The second spring 16 is stretched to provide the reset power for the piston column 17. The piston column 17 presses the transmission fluid 19 inward and transfers the pressure to the extrusion column 20 through the flow characteristics of the transmission fluid 19. All three adapter wheels 18 evenly transfer the pressure through the piston columns 17, so that the axis of the adapter ring 12 and the axis of the upper part of the steel wire rope 11 are always collinear. The second connecting column 13 and the magnetic sensor 14 connected to the adapter ring 12 can also always maintain a fixed relative position with the steel wire rope 11. When the steel wire rope 11 is not stretched, the magnetic field signal generated by the energized steel wire rope 11 is captured by the magnetic sensor 14, and the magnetic field signal is converted into a digital signal through an A / D conversion circuit and transmitted into a computer to obtain the magnetic field intensity information of the steel wire rope 11; when the stretching mechanism 9 is started, it will continuously stretch the steel wire rope 11 towards both ends. The steel wire rope 11 will move synchronously towards both ends during this process. On the one hand, it drives the adapter wheel 18 to rotate for adaptation. At the same time, the diameter value of the steel wire rope 11 undergoes an invisible reduction phenomenon to the naked eye. At this time, the extrusion column 20 presses the transmission fluid 19 through the resilience generated by being extruded, driving the three piston columns 17 to move synchronously along the radial direction of the steel wire rope 11, driving the adapter wheels 18 to always be in pressing contact with the outer surface of the steel wire rope 11, and keeping the axes of the adapter ring 12, the magnetic sensor 14 and the upper part of the steel wire rope 11 collinear. At this time, even if the steel wire rope 11 undergoes a slight position change, the magnetic sensor 14 can also move synchronously under the drive of the adapter wheel 18, the piston column 17 and the adapter ring 12, keeping the detection position unchanged, thereby avoiding changes in the detection test variables and being beneficial to improving the detection accuracy.

[0033] The stretching mechanism 9 includes a motor 91 and two support shafts 93 located on the left and right sides of the output shaft of the motor 91. A first gear 92 is fixedly installed on the outer surface of the motor 91. A second gear 94 is fixedly installed on the front sides of the outer surfaces of the two support shafts 93. The first gear 92 and the second gear 94 are meshed and transmitted. A sleeve 95 is fixedly sleeved on the outer surface of the support shaft 93. The left and right sides of the outer surfaces of the left and right sleeves 95 are provided with placement grooves 96. The two ends of the wire rope 11 are movably inserted into the placement grooves 96.

[0034] After the motor 91 is started, the two support shafts 93 are driven to rotate synchronously through the No. 1 gear 92 and the No. 2 gear 94, and then the sleeve 95 is driven to rotate. The two ends of the wire rope 11 are guided by the guide wheel 10 and inserted into the inside of the left and right placement grooves 96. When the sleeve 95 rotates, the two ends of the radially stressed wire rope 11 will not separate from the inside of the placement groove 96. When the sleeve 95 rotates, the two ends of the wire rope 11 will be synchronously connected, thereby realizing the tensile detection function of the wire rope 11.

[0035] There are four guide wheels 10 which are sequentially distributed on the left and right sides of the workbench 1, and the steel wire rope 11 is movably wound around the outer surface of the guide wheel 10;

[0036] 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.

[0037] Among them, eight threaded holes 2 with equal spacing are opened on the front and rear sides of the top of the workbench 1, and the front and rear sides of the mobile frame 4 are installed on the top of the workbench 1 by bolts 3 and threaded holes 2.

[0038] 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. The magnetic sensor 14 is driven to move along the axis of the wire rope 11 to any point on the upper side of the wire rope 11 through the adapter ring 12, and then 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 fatigue resistance test of multiple points on the surface of the wire rope 11 can be achieved, and through the cooperation of the adapter wheel 18, the piston column 17, the transmission fluid 19 and the extrusion column 20 as well as the adapter ring 12, the axial direction of the magnetic sensor 14 and the axial direction of the upper side of the wire rope 11 are always kept in line, thereby avoiding the increase of the variable during detection and improving the flexibility of detection.

[0039] The interior of the connecting tube 5 is elastically connected to a No. 1 spring 6, a No. 1 connecting column 7 is elastically supported in the interior of the connecting tube 5 by the No. 1 spring 6, and the upper and lower sides of the connecting block 8 are fixedly connected to the No. 1 connecting column 7 and the adapter ring 12 in sequence;

[0040] 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 is connected to the first connection column 7. When the adapter ring 12 moves, the movement of the adapter ring 12 along the radial direction of the first connection column 7 is restricted, and only the adapter ring 12 with the connection block 8 and the first connection column 7 is allowed to move linearly up and down. When the wire rope 11 is straightened and drives the adapter ring 12 and the magnetic sensor 14 to move synchronously through the adapter wheel 18, the connection cylinder 5 presses the first connection column 7 to overcome the power generated by the adapter ring 12 itself when driven by the wire rope 11, and improve the stability of the adapter ring 12 and the magnetic sensor 14.

[0041] Among them, the number of receiving columns 15 is three and they are fixedly connected at equal angles on the inner ring surface of the adapter ring 12. The second spring 16 is movably sleeved on the outer surface of the piston column 17 and is stretched. The two ends of the second spring 16 are elastically connected to the piston column 17 and the receiving column 15 in sequence. The outer surfaces of the three adapter wheels 18 are in adaptive contact with the outer surface of the wire rope 11;

[0042] The second spring 16 is sleeved on the outer surface of the piston column 17, but it is not responsible for the feedback when the piston column 17 is stressed. When the 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 into the receiving column 15, the flowing transmission fluid 19 is pressed and the extrusion column 20 is compressed synchronously, so that the extrusion column 20 deforms and generates pressure on the transmission fluid 19, and the relative position stability of the adapter wheel 18 when pressing the surface of the wire rope 11 is maintained.

[0043] Among them, the number of extrusion columns 20 is three and they are adhesively distributed at equal angles on the inner wall of the adapter ring 12. The extrusion column 20 is made of a rubber block. The longitudinal section shape of the extrusion column 20 is a sector and the opening angle is 80°. A sealing cavity 121 is opened inside the adapter ring 12, and the transmission fluid 19 is hermetically filled inside the sealing cavity 121 through the extrusion column 20 and the receiving column 15;

[0044] Such as Figure 7 、 8 As shown, when the extrusion column 20 made of a rubber block is pressed and deformed by the piston column 17 through the transmission fluid 19, it can generate the same pressure on the three piston columns 17 synchronously, so that the axis of the adapter ring 12 and the axis of the wire rope 11 can be collinear.

[0045] Among them, the number of the second connection columns 13 is three. The three second connection columns 13 are distributed at equal angles on the left side of the adapter ring 12. The left and right sides of the second connection column 13 are fixedly connected to the magnetic sensor 14 and the adapter ring 12 in sequence;

[0046] The second connecting column 13 is used to fixedly connect the magnetic sensor 14, and is used to connect the adapter ring 12 and the magnetic sensor 14, so that the adapter ring 12 and the magnetic sensor 14 are integrated into one body.

[0047] Among them, the number of connecting cylinders 5 is three and they are evenly distributed on the top of the moving frame 4. The first spring 6 is compressively arranged inside the connecting cylinder 5;

[0048] The first spring 6 supports and connects the adapter ring 12 and the magnetic sensor 14 by cooperating with the first spring 6, the first connecting column 7 and the connecting block 8, and provides a corresponding guiding function when the adapter ring 12 moves.

[0049] Among them, the first gear 92 is located at the front end of the output shaft of the motor 91, and the diameter value of the first gear 92 is smaller than the diameter value of the second gear 94;

[0050] When the first gear 92 is driven by the motor 91 to rotate, it can mesh with the second gear 94 and rotate, and reduce the rotation speed and increase the torque.

[0051] Working principle and usage process:

[0052] First, pass the wire rope 11 to be detected through the inner ring surfaces of the adapter ring 12 and the second connecting column 13. The outer surface of the wire rope 11 contacts the adapter wheel 18 and generates a squeezing force, driving the piston column 17 to move into the accommodating column 15. The second spring 16 is stretched. The transmission fluid 19 located inside the accommodating column 15 is squeezed and flows by the moving piston column 17, exerting pressure on the extrusion column 20, so that the extrusion column 20 is subjected to a squeezing force and deforms, and the pressure of the transmission fluid 19 rises. After being guided by the guide wheel 10, both ends of the wire rope 11 are sequentially inserted downward into the left and right placement grooves 96 and fixed;

[0053] Then, connect the wiring terminal of the magnetic sensor 14 to the A / D conversion circuit and connect it to the computer. When the wire rope 11 is not stretched: energize the wire rope 11 to generate a magnetic field. At this time, the magnetic sensor 14 captures the magnetic field signal, converts it into a digital signal through the A / D conversion circuit, and then transmits it into the computer to obtain the magnetic field intensity information;

[0054] During detection: Start the motor 91 to drive the first gear 92 and the second gear 94 to rotate, drive the support shaft 93 and the sleeve 95 to rotate, so that the rotating sleeve 95 winds and stretches the steel wire rope 11, causing the steel wire rope 11 to be subjected to tension and straightened. At this time, the steel wire rope 11 straightened on the upper side will drive the adapter wheel 18 and the adapter ring 12 as a whole to move, so that the axes of the adapter ring 12 and the magnetic sensor 14 are collinear with the axis of the steel wire rope 11. At this time, the magnetic sensor 14 detects the magnetic field strength information again when the steel wire rope 11 is stretched. Since the adapter wheel 18 drives the piston column 17 to move into the receiving column 15 and generates pressure on the extrusion column 20 by pressing the flowing transmission fluid 19, the adapter ring 12 and the steel wire rope 11 moving in tension can always maintain the stability of the relative position. When the adapter ring 12 moves up and down, it drives the first connecting column 7 to move up and down along the inside of the connecting cylinder 5 through the connecting block 8, causing the first spring 6 to be stretched or compressed;

[0055] Finally, when it is necessary to detect the tensile strength of different positions of the steel wire rope 11, remove the bolt 3, move the moving frame 4 to the left or right, and then re-fix the bolt 3 on the moving frame 4, so that flexible detection can be achieved. An external student power supply can be used to connect to the power supply.

[0056] 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 any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fatigue resistance test system for steel wire ropes using magnetic field changes, comprising a workbench (1) and a steel wire rope (11). Guide wheels (10) are fixedly installed on both the upper and lower sides of the workbench (1). It is characterized in that: A stretching mechanism (9) is rotatably arranged on the inner wall of the workbench (1). A moving frame (4) is press-fitted and installed on the top of the workbench (1). A connecting cylinder (5) is fixedly installed on the top of the moving frame (4). A first connecting column (7) is connected in the connecting cylinder (5) through a first spring (6) for guiding. The bottom of the first connecting column (7) is fixedly connected with a connecting block (8) and an adapter ring (12). The inner ring surface of the adapter ring (12) is fixedly communicated with a receiving column (15). An extrusion column (20) is arranged on the inner wall of the adapter ring (12). A second spring (16) and a piston column (17) are movably sleeved in the receiving column (15). The other end of the piston column (17) is fixedly connected with an adapter wheel (18). The inner cavities of the adapter ring (12) and the receiving column (15) are filled with a transmission fluid (19). Both ends of the steel wire rope (11) are inserted into the stretching mechanism (9) through guide wheels (10). The steel wire rope (11) penetrates through the inner ring surface of the adapter ring (12) and is in pressing contact with the adapter wheel (18). A magnetic sensor (14) is fixedly connected to the left side of the adapter ring (12) through a second connecting column (13).

2. The fatigue resistance test system for wire ropes using magnetic field changes according to claim 1, characterized in that: The stretching mechanism (9) includes a motor (91) and two support shafts (93) on the left and right sides of the output shaft of the motor (91). A first gear (92) is fixedly installed on the outer surface of the motor (91). A second gear (94) is fixedly installed on the front side of the outer surfaces of both support shafts (93). The first gear (92) is in meshing transmission with the second gear (94). A sleeve (95) is fixedly sleeved on the outer surface of the support shaft (93). Placing grooves (96) are formed on the left and right sides of the outer surfaces of the left and right sleeves (95). Both ends of the steel wire rope (11) are movably inserted into the placing grooves (96).

3. A steel wire rope fatigue resistance test system using magnetic field variation 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 fatigue resistance test system for steel wire ropes utilizing magnetic field changes according to claim 1, characterized in that: Eight threaded holes (2) are horizontally and equidistantly distributed on the front and rear sides of the top of the workbench (1). The front and rear sides of the moving frame (4) are press-fitted and installed on the top of the workbench (1) through bolts (3) and the threaded holes (2).

5. A steel wire rope fatigue resistance testing system using magnetic field variation according to claim 1, characterized in that: The first spring (6) is elastically connected inside the connecting cylinder (5). The first connecting column (7) is elastically supported inside the connecting cylinder (5) through the first spring (6). The upper and lower sides of the connecting block (8) are fixedly connected with the first connecting column (7) and the adapter ring (12) in sequence.

6. A steel wire rope fatigue resistance test system using magnetic field variation according to claim 1, characterized in that: The number of the receiving columns (15) is three and they are fixedly connected to the inner ring surface of the adapter ring (12) at equal angles. The second spring (16) is movably sleeved on the outer surface of the piston column (17) and is stretched. Both ends of the second spring (16) are elastically connected with the piston column (17) and the receiving column (15) in sequence. The outer surfaces of the three adapter wheels (18) are in adaptive contact with the outer surface of the steel wire rope (11).

7. A steel wire rope fatigue resistance test system using magnetic field variation according to claim 1, characterized in that: The number of the extrusion columns (20) is three, and they are adhesively distributed at equal angles on the inner wall of the adapter ring (12). The extrusion columns (20) are made of rubber blocks. The longitudinal cross-sectional shape of the extrusion columns (20) is fan-shaped and the opening and closing angle is 80°. A sealing cavity (121) is formed inside the adapter ring (12). The transmission fluid (19) is hermetically filled inside the sealing cavity (121) through the extrusion columns (20) and the receiving columns (15).

8. A fatigue resistance test system for wire ropes using magnetic field changes according to claim 1, characterized in that: The number of the second connecting columns (13) is three, and the three second connecting columns (13) are distributed at equal angles on the left side of the adapter ring (12). The left and right sides of the second connecting columns (13) are fixedly connected to the magnetic sensor (14) and the adapter ring (12) in sequence.

9. A steel wire rope fatigue resistance test system using magnetic field variation according to claim 1, characterized in that: The number of the connecting cylinders (5) is three, and they are distributed at equal intervals on the top of the moving frame (4). The first spring (6) is disposed inside the connecting cylinder (5) in a compressed state.

10. A steel wire rope fatigue resistance test system using magnetic field variation according to claim 2, characterized in that: The first gear (92) is located at the front end of the output shaft of the motor (91), and the diameter value of the first gear (92) is smaller than the diameter value of the second gear (94).

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