A safety detection device for fall arrester

Abstract

The present invention is applicable to the technical field of fall arrester detection, and provides a fall arrester safety detection device, including a frame, the frame including a base and a top plate; also including: a weight simulation unit, the weight simulation unit including a connecting plate and a plurality of counterweights, the bottom of the top plate is also provided with an adjustment component; a detection mechanism, the detection mechanism including a drive motor, the output end of the drive motor is connected to a drive shaft, a measuring gear is installed on the drive shaft, the drive shaft is also sleeved with a coaxially arranged first winding wheel, a second winding wheel and a third winding wheel, the top plate is also provided with a connecting mechanism, the first winding wheel, the second winding wheel and the third winding wheel are all wound with a suspension rope, and the bottom of each suspension rope is provided with a limit assembly; a marking assembly. The device is simple to operate, can simulate the force of free fall motion on the fall arrester body when working, has a wide range of applications, and high work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of fall arrester detection, and in particular relates to a fall arrester safety detection device. Background Art

[0002] A fall arrester is a safety device that works on the principle of gravity and inertia. When the operator loses balance or control, the fall arrester can automatically lock and stop the descent, thereby protecting the operator's life. It usually consists of a spring, a locking mechanism and a trigger, and is connected to a safety belt or rope. The fall arrester can quickly brake and lock the falling object within a limited distance. It is suitable for cargo hoisting, protecting the life safety of ground operators and preventing damage to the hoisted workpiece. It has a wide range of applications, including metallurgy, automobile manufacturing, petrochemicals, engineering construction, power, ships, communications, pharmaceuticals, bridges and other high-altitude work sites.

[0003] Since the use of a fall arrester affects the life safety of the operator, it is necessary to frequently perform safety inspections on the fall arrester. Existing fall arrester inspection devices require manual installation and screening of the fall arrester, which places great pressure on the operator and the inspection results are prone to errors. In the prior art, there is also a method of using a transmission device to drive a clamp holding the fall arrester to move, so as to achieve the working simulation of the fall arrester. However, such equipment is difficult to effectively simulate the free fall motion of an object, so the simulation process cannot reproduce the use scenario of the fall arrester. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a fall arrester safety detection device, aiming to solve the problems raised in the above-mentioned background technology.

[0005] The embodiment of the present invention is implemented as follows: a fall arrester safety detection device comprises a frame, wherein the frame comprises a base and a top plate, wherein the base and the top plate are connected to each other via four symmetrically distributed guide pillars, and the bottom of the top plate is connected to the fall arrester body via a connecting rope; and further comprises:

[0006] A weight simulation unit, the weight simulation unit comprising a connecting plate connected to the bottom of the fall arrester body, and a counterweight block slidably mounted on two guide pillars on the same side in a vertical direction, a plurality of counterweight blocks are sequentially stacked on the two guide pillars on the same side, and the two ends of the connecting plate are respectively connected to the two counterweight blocks at the bottom, and an adjustment component for adjusting the number of counterweight blocks falling in a single time is also provided at the bottom of the top plate;

[0007] The detection mechanism comprises a driving motor installed on the top of the top plate, the output end of the driving motor is connected to a driving shaft, a measuring gear is installed on the driving shaft, the driving shaft is also sleeved with a coaxially arranged first winding wheel, a second winding wheel and a third winding wheel, one end of the third winding wheel is rotatably installed on the driving shaft, and the first winding wheel, the second winding wheel and the third winding wheel are rotatably connected to each other through a connecting ring, and a connecting mechanism for adjusting the connection state between the driving shaft and the first winding wheel, the second winding wheel and the third winding wheel respectively is also provided on the top plate, a suspension rope is wound on the first winding wheel, the second winding wheel and the third winding wheel, each of the suspension ropes passes through the top plate, and the bottom of each of the suspension ropes is detachably connected to the connecting plate through a limiting assembly;

[0008] A marking assembly includes a guide seat installed on the top plate, a transmission rack is slidably installed on the guide seat along the vertical direction, and the transmission rack is meshed with a measuring gear. A marking needle is also installed on the transmission rack, and a marking plate is provided at one end of the marking needle away from the transmission rack.

[0009] A further technical solution is that the connecting mechanism includes an electric telescopic rod installed on the top plate, and a column gear installed on the driving shaft, the column gear and the driving shaft are connected by a sliding key, and the first winding wheel, the second winding wheel and the third winding wheel are all provided with annular internal teeth that cooperate with the column gear, a rotating ring is rotatably installed on one side of the column gear close to the electric telescopic rod, and the telescopic end of the electric telescopic rod is connected to the rotating ring.

[0010] A further technical solution is that the limit assembly includes a hollow limit column installed at the bottom of the suspension rope, and the connecting plate is provided with a through hole matching the hollow limit column, the hollow limit column is provided with a mounting column and an electromagnet, an adjusting ring is installed on the mounting column along its axial sliding direction, and the adjusting ring and the electromagnet are connected to each other through a reset spring, a plurality of adjusting connecting rods are installed in a ring array on the adjusting ring, and each of the adjusting connecting rods is hinged to the adjusting ring, and each of the adjusting connecting rods is hinged to a limit rod at one end away from the adjusting ring, and each of the limit rods is installed inside the top wall of the hollow limit column along the radial sliding direction of the hollow limit column, and a through hole matching the limit rod is provided on the side wall of the hollow limit column.

[0011] According to a further technical solution, the diameter ratio of the first winding wheel, the second winding wheel, the third winding wheel and the measuring gear is 4:3:2:1.

[0012] According to a further technical solution, a buffer plate is connected between the two guide pillars on the same side, and a buffer spring is sleeved on the area of ​​the guide pillar between the buffer plate and the base.

[0013] According to a further technical solution, a magnet block is also provided in the area of ​​each suspension rope close to the lower surface of the top plate.

[0014] A further technical solution is that the adjustment assembly includes two mounting plates symmetrically arranged on both sides of the top plate, and a plurality of positioning telescopic rods are installed on the mounting plates in the vertical direction, and the number of the positioning telescopic rods is the same as the number of counterweight blocks, the telescopic ends of the positioning telescopic rods are connected with positioning plugs, and each of the counterweight blocks is provided with a corresponding slot matching the positioning plug.

[0015] The embodiment of the present invention provides a safety detection device for a fall arrester. When in use, the fall arrester body only needs to be hung on the bottom of the top plate, and the bottom of the fall arrester body is connected to the connecting plate through a hook. Then, the positioning of a specified number of counterweights is released according to the required weight by adjusting the assembly, and the counterweights will synchronously perform free fall along the guide pillars. The counterweights can pull the fall arrester body through the connecting plate, thereby measuring the falling distance of the fall arrester body when it is locked. At the same time, the falling distance of the fall arrester body when it works normally is determined according to the rated parameters of the fall arrester body to be tested. Since the falling distance is the same as the stretching length of the suspension rope, the number of rotations of the first winding wheel, the second winding wheel and the third winding wheel is estimated according to the falling distance. When the first winding wheel, the second winding wheel or the third winding wheel rotates, it will drive the driving shaft to rotate synchronously through the connecting mechanism. The driving shaft can drive the measuring gear to rotate the same number of circles. The measuring gear can drive the transmission rack to slide along the guide seat. The transmission rack can drive the marking needle to mark on the marking plate. Therefore, the marking length is estimated according to the number of circles, and one of the first winding wheel, the second winding wheel or the third winding wheel is selected according to the diameter ratio, so that the marking length is within a suitable range. Then, one of the first winding wheel, the second winding wheel or the third winding wheel is connected to the driving shaft through the connecting mechanism, and marking can be performed. By measuring the length of the marking, the movement distance of the transmission rack can be obtained, and then the actual falling distance of the fall arrester body can be calculated according to the movement distance of the transmission rack. The device is easy to operate, can simulate the force of free fall motion on the fall arrester body when working, can simulate various weights, and can be applicable to the detection requirements of various fall arrester bodies, with high working efficiency and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a safety detection device for a fall arrester provided in an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A in the enlarged view;

[0018] Figure 3 A schematic structural diagram of a safety detection device for a fall arrester provided by an embodiment of the present invention from another perspective;

[0019] Figure 4 for Figure 3 The enlarged view of point B in the figure;

[0020] Figure 5 A schematic structural diagram of a limit assembly in a fall arrester safety detection device provided by an embodiment of the present invention;

[0021] Figure 6 for Figure 3 The enlarged view of point C in the figure;

[0022] Figure 7 A cross-sectional view of a detection mechanism in a fall arrester safety detection device provided in an embodiment of the present invention.

[0023] In the accompanying drawings: frame 1; base 11; guide pillar 12; top plate 13; buffer plate 14; buffer spring 15; fall arrester body 2; connecting rope 21; weight simulation unit 3; connecting plate 31; counterweight block 32; mounting plate 33; positioning telescopic rod 34; positioning plug block 35; detection mechanism 4; driving motor 41; driving shaft 42; first winding wheel 43; second winding wheel 44; third winding wheel 45; hanging rope 46; measuring gear 47; connecting ring 48; magnet block 49; marking assembly 5; guide seat 51; transmission rack 52; marking needle 53; marking plate 54; connecting mechanism 6; electric telescopic rod 61; column gear 62; rotating ring 63; limit assembly 7; hollow limit column 71; mounting column 72; adjusting ring 73; reset spring 74; reset spring 74; electromagnet 75; adjusting connecting rod 76; limit plug rod 77. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, a fall arrester safety detection device provided by an embodiment of the present invention includes a frame 1, wherein the frame 1 includes a base 11 and a top plate 13, wherein the base 11 and the top plate 13 are connected to each other through four symmetrically distributed guide pillars 12, and the bottom of the top plate 13 is connected to a fall arrester body 2 through a connecting rope 21; and further includes:

[0027] A weight simulation unit 3, the weight simulation unit 3 comprises a connecting plate 31 connected to the bottom of the fall arrester body 2, and a counterweight block 32 slidably mounted on two guide pillars 12 on the same side in a vertical direction, a plurality of counterweight blocks 32 are sequentially stacked on the two guide pillars 12 on the same side, and both ends of the connecting plate 31 are respectively connected to the two counterweight blocks 32 at the lowest end, and an adjustment component for adjusting the number of counterweight blocks 32 falling in a single time is also provided at the bottom of the top plate 13;

[0028] The detection mechanism 4 comprises a driving motor 41 installed on the top of the top plate 13, the output end of the driving motor 41 is connected to a driving shaft 42, a measuring gear 47 is installed on the driving shaft 42, the driving shaft 42 is also sleeved with a first winding wheel 43, a second winding wheel 44 and a third winding wheel 45 which are coaxially arranged, one end of the third winding wheel 45 is rotatably installed on the driving shaft 42, and the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 are rotatably connected to each other through a connecting ring 48, and the top plate 13 is also provided with a connecting mechanism 6 for adjusting the connection state between the driving shaft 42 and the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 respectively, the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 are all wound with a hanging rope 46, each of the hanging ropes 46 passes through the top plate 13, and the bottom of each of the hanging ropes 46 is detachably connected to the connecting plate 31 through a limiting component 7;

[0029] The marking assembly 5 includes a guide seat 51 installed on the top plate 13, a transmission rack 52 is slidably installed on the guide seat 51 along the vertical direction, and the transmission rack 52 is meshed with the measuring gear 47, a marking needle 53 is also installed on the transmission rack 52, and a marking plate 54 is provided at one end of the marking needle 53 away from the transmission rack 52.

[0030] In an embodiment of the present invention, the diameter ratio of the first winding wheel 43, the second winding wheel 44, the third winding wheel 45 and the measuring gear 47 is 4:3:2:1. When in use, it is only necessary to hang the fall arrester body 2 on the bottom of the top plate 13, and connect the bottom of the fall arrester body 2 to the connecting plate 31 through a hook. Then, the positioning of the specified number of counterweights 32 is released according to the required weight through the adjustment component, and the counterweights 32 will synchronously perform free fall along the guide pillar 12. The counterweights 32 can pull the fall arrester body 2 through the connecting plate 31, thereby measuring the falling distance of the fall arrester body 2 when it is locked. At the same time, the falling distance of the fall arrester body 2 when it is normally working is determined according to the rated parameters of the fall arrester body 2 to be tested. Since the falling distance is the same as the stretching length of the suspension rope 46, the number of turns of the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 is estimated according to the falling distance. The number of turns is calculated as follows:

[0031] N=S 1 / (π·d)

[0032] Where N is the number of turns, S 1 is the rated falling distance, and d is the diameter of the first winding wheel 43 , the second winding wheel 44 or the third winding wheel 45 .

[0033] When the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 rotates, the driving shaft 42 is driven to rotate synchronously through the connecting mechanism 6, and the driving shaft 42 can drive the measuring gear 47 to rotate the same number of circles, and the measuring gear 47 can drive the transmission rack 52 to slide along the guide seat 51, and the transmission rack 52 can drive the marking needle 53 to mark on the marking plate 54, and then the marking length is estimated according to the number of circles, and one of the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 is selected according to the diameter ratio, so that the marking length is at an appropriate range, and then connect the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 to the driving shaft 42 through the connecting mechanism 6, and control the corresponding limit assembly 7 to work, and connect the specified suspension rope 46 to the connecting plate 31 through the limit assembly 7. The connecting plate 31 will drive the suspension rope 46 to unwind, and then the line can be drawn. By measuring the length of the drawn line, the movement distance of the transmission rack 52 can be obtained, which effectively shortens the measurement distance. Then, the actual falling distance of the fall arrester body 2 can be calculated according to the movement distance of the transmission rack 52. The calculation formula is as follows:

[0034] S= S 2 ·(d / d 1 )

[0035] Where S is the actual falling distance of the fall arrester body 2, S 2 is the length of the marking line, d is the diameter of the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45, and d 1 To measure the pitch circle diameter of gear 47.

[0036] When the measurement is completed, the drive motor 41 is started, and the drive motor 41 can drive the drive shaft 42 to rotate, thereby driving the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 to rotate through the connecting mechanism 6 to achieve the winding of the suspension rope 46. The suspension rope 46 can in turn use the limiting component 7 to lift the connecting plate 31 to the initial position to complete a detection.

[0037] like Figure 1 , Figure 3 and Figure 4As shown, as a preferred embodiment of the present invention, the connecting mechanism 6 includes an electric telescopic rod 61 installed on the top plate 13, and a column gear 62 installed on the driving shaft 42, the column gear 62 and the driving shaft 42 are connected by a sliding key, and the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 are all provided with annular internal teeth that cooperate with the column gear 62, and a rotating ring 63 is rotatably installed on the side of the column gear 62 close to the electric telescopic rod 61, and the telescopic end of the electric telescopic rod 61 is connected to the rotating ring 63.

[0038] In the embodiment of the present invention, when in use, the driving shaft 42 can continuously drive the column gear 62 to rotate. By controlling the contraction of the electric telescopic rod 61, the electric telescopic rod 61 can drive the column gear 62 to slide along the axial direction of the driving shaft 42 through the rotating ring 63. Through the mutual engagement between the column gear 62 and the annular inner teeth, any one of the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 can be driven to rotate, so that the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 can be selected to rotate according to usage requirements to achieve unwinding and winding.

[0039] like Figure 3 , Figure 4 and Figure 5 As shown, as a preferred embodiment of the present invention, the limit assembly 7 includes a hollow limit column 71 installed at the bottom of the suspension rope 46, and a through hole matching the hollow limit column 71 is provided on the connecting plate 31, a mounting column 72 and an electromagnet 75 are installed in the hollow limit column 71, an adjusting ring 73 is installed on the mounting column 72 along its axial sliding, and the adjusting ring 73 and the electromagnet 75 are connected to each other through a reset spring 74, a plurality of adjusting connecting rods 76 are installed in a ring on the adjusting ring 73, and each of the adjusting connecting rods 76 is hinged on the adjusting ring 73, and one end of each adjusting connecting rod 76 away from the adjusting ring 73 is hinged to a limit plug 77, and each of the limit plugs 77 is installed inside the top wall of the hollow limit column 71 along the radial sliding of the hollow limit column 71, and a through hole matching the limit plug 77 is provided on the side wall of the hollow limit column 71.

[0040] In the embodiment of the present invention, when in use, when the electromagnet 75 is in the power-off state, the reset spring 74 is in the extended state, the distance between the adjustment ring 73 and the electromagnet 75 is the largest, and the adjustment ring 73 can drive the limit plug 77 to shrink in the hollow limit column 71 through the adjustment connecting rod 76. At this time, the hollow limit column 71 can pass through the through hole opened on the connecting plate 31, so the hollow limit column 71 will not be driven to move downward synchronously during the falling process of the connecting plate 31. When the connecting plate 31 is to drive the specified hollow limit column 71 to move downward, it is only necessary to control the electromagnet 75 in the group of limit components 7 to be energized, and the magnetic attraction of the electromagnet 75 will cause the adjustment ring 73 to move to the side close to the electromagnet 75, and the adjustment ring 73 can drive the limit plug 77 to extend to the outside of the side wall of the hollow limit column 71 through the adjustment connecting rod 76. At this time, the connecting plate 31 can drive the group of limit components 7 to move downward synchronously through the limit plug 77, thereby pulling the corresponding suspension rope 46 to extend. When the suspension rope 46 is being wound up, the suspension rope 46 can in turn use the limiting assembly 7 to lift the connecting plate 31 to the initial position, thus completing one inspection.

[0041] like Figure 1 As shown, as a preferred embodiment of the present invention, a buffer plate 14 is connected between the two guide pillars 12 on the same side, and a buffer spring 15 is sleeved on the area of ​​the guide pillar 12 between the buffer plate 14 and the base 11.

[0042] In the embodiment of the present invention, the buffer plate 14 is located below the counterweight 32 and close to the bottom of the guide pillar 12. The elastic force provided by the buffer spring 15 can prevent the counterweight 32 from falling directly onto the base 11 due to failure of the fall arrester body 2, thereby improving the safety of the device and preventing damage to components.

[0043] like Figure 6 As shown, as a preferred embodiment of the present invention, each of the suspension ropes 46 is further provided with a magnet block 49 in the area close to the lower surface of the top plate 13. When not in operation, each of the suspension ropes 46 is correspondingly wound on the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45, and the magnet block 49 will be adsorbed on the lower surface of the top plate 13. Through the limiting effect of the magnet block 49, each of the limiting rods 77 is exactly in a state of being flush with the lower surface of the connecting plate 31, so that the distance the connecting plate 31 descends is exactly the same as the distance the suspension rope 46 is unwound.

[0044] like Figure 1 , Figure 3 and Figure 4As shown, as a preferred embodiment of the present invention, the adjustment assembly includes two mounting plates 33 symmetrically arranged on both sides of the top plate 13, and a plurality of positioning telescopic rods 34 are installed on the mounting plates 33 along the vertical direction, and the number of the positioning telescopic rods 34 is the same as the number of the counterweight blocks 32, and the telescopic ends of the positioning telescopic rods 34 are connected with positioning plugs 35, and each of the counterweight blocks 32 is correspondingly provided with a slot matching the positioning plug 35.

[0045] In the embodiment of the present invention, in the initial state, each positioning plug 35 is correspondingly inserted into the corresponding counterweight 32, and at this time, each counterweight 32 is fixed to the upper part of the guide pillar 12. When the connecting plate 31 is to be driven to perform free fall motion with a specified weight, it is only necessary to control the specified number of positioning telescopic rods 34 to be retracted in sequence from bottom to top, and the positioning telescopic rods 34 can drive the positioning plug 35 to be separated from the corresponding counterweight 32. At this time, under the action of gravity, the connecting plate 31 and the corresponding counterweight 32 can perform free fall motion, thereby simulating the state of the fall arrester body 2 when working.

[0046] Working principle: When in use, just hang the fall arrester body 2 on the bottom of the top plate 13, and connect the bottom of the fall arrester body 2 to the connecting plate 31 through a hook. In the initial state, each positioning plug 35 is correspondingly plugged into the corresponding counterweight block 32. At this time, each counterweight block 32 is fixed to the upper part of the guide pillar 12. When the connecting plate 31 is to be driven to perform free fall motion with a specified weight, it is only necessary to control the specified number of positioning telescopic rods 34 to retract from bottom to top in sequence. The positioning telescopic rods 34 can drive the positioning plug 35 to detach from the corresponding counterweight block 32. At this time, under the action of gravity, the connecting plate 31 and the corresponding counterweight block 32 can perform free fall motion, thereby simulating the state of the fall arrester body 2 when it is working, and measuring the falling distance of the fall arrester body 2 when it is locked. At the same time, the falling distance of the fall arrester body 2 when it is working normally is determined according to the rated parameters of the fall arrester body 2 to be tested. Since the falling distance is the same as the stretched length of the suspension rope 46, the number of rotations of the first winding wheel 43, the second winding wheel 44 and the third winding wheel 45 is estimated according to the falling distance. When the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 rotates, it will drive the driving shaft 42 to rotate synchronously through the connecting mechanism 6. The driving shaft 42 can drive the measuring gear 47 to rotate the same number of times, and the measuring gear 47 can drive the transmission rack 52 to slide along the guide seat 51. 52 can drive the marking needle 53 to mark on the marking plate 54, so the marking length is estimated according to the number of turns, and one of the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 is selected according to the diameter ratio, so that the marking length is within an appropriate range, and then the first winding wheel 43, the second winding wheel 44 or the third winding wheel 45 is connected to the drive shaft 42 through the connecting mechanism 6, and marking can be performed. By measuring the length of the marking, the movement distance of the transmission rack 52 can be obtained, and then the actual falling distance of the fall arrester body 2 can be calculated according to the movement distance of the transmission rack 52.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety detection device for a fall arrester, characterized in that: The invention comprises a frame, wherein the frame comprises a base and a top plate, wherein the base and the top plate are connected to each other through four symmetrically distributed guide pillars, and the bottom of the top plate is connected to a fall arrester body through a connecting rope; and further comprises: A weight simulation unit, the weight simulation unit comprising a connecting plate connected to the bottom of the fall arrester body, and a counterweight block slidably mounted on two guide pillars on the same side in a vertical direction, a plurality of counterweight blocks are sequentially stacked on the two guide pillars on the same side, and the two ends of the connecting plate are respectively connected to the two counterweight blocks at the lowest end, and an adjustment component for adjusting the number of counterweight blocks falling in a single time is also provided at the bottom of the top plate; The detection mechanism comprises a driving motor installed on the top of the top plate, the output end of the driving motor is connected to a driving shaft, a measuring gear is installed on the driving shaft, the driving shaft is also sleeved with a coaxially arranged first winding wheel, a second winding wheel and a third winding wheel, one end of the third winding wheel is rotatably installed on the driving shaft, and the first winding wheel, the second winding wheel and the third winding wheel are rotatably connected to each other through a connecting ring, and a connecting mechanism for adjusting the connection state between the driving shaft and the first winding wheel, the second winding wheel and the third winding wheel respectively is also provided on the top plate, a suspension rope is wound on the first winding wheel, the second winding wheel and the third winding wheel, each of the suspension ropes passes through the top plate, and the bottom of each of the suspension ropes is detachably connected to the connecting plate through a limiting assembly; A scribing assembly, the scribing assembly comprising a guide seat mounted on the top plate, a transmission rack slidably mounted on the guide seat in a vertical direction, the transmission rack meshing with a measuring gear, a scribing needle mounted on the transmission rack, and a scribing plate disposed at one end of the scribing needle away from the transmission rack; The connecting mechanism comprises an electric telescopic rod mounted on the top plate, and a column gear mounted on the driving shaft, the column gear and the driving shaft are connected by a sliding key, and the first winding wheel, the second winding wheel and the third winding wheel are all provided with annular internal teeth matched with the column gear inside, a rotating ring is rotatably mounted on a side of the column gear close to the electric telescopic rod, and the telescopic end of the electric telescopic rod is connected to the rotating ring; The limit assembly includes a hollow limit column installed at the bottom of the suspension rope, and the connecting plate is provided with a through hole matching the hollow limit column, a mounting column and an electromagnet are installed in the hollow limit column, an adjusting ring is installed on the mounting column along its axial sliding, and the adjusting ring and the electromagnet are connected to each other through a reset spring, a plurality of adjusting connecting rods are installed in a ring array on the adjusting ring, and each of the adjusting connecting rods is hinged on the adjusting ring, and one end of each adjusting connecting rod away from the adjusting ring is hinged to a limit plug, and each of the limit plugs is installed inside the top wall of the hollow limit column along the radial sliding of the hollow limit column, and a through hole matching the limit plug is opened on the side wall of the hollow limit column; The diameter ratio of the first winding wheel, the second winding wheel, the third winding wheel and the measuring gear is 4:3:2:1; The adjustment assembly includes two mounting plates symmetrically arranged on both sides of the top plate, and a plurality of positioning telescopic rods are installed on the mounting plates in the vertical direction, and the number of the positioning telescopic rods is the same as the number of counterweight blocks, the telescopic ends of the positioning telescopic rods are connected with positioning plugs, and each of the counterweight blocks is correspondingly provided with a slot matching the positioning plug.

2. The fall arrester safety detection device according to claim 1, characterized in that: A buffer plate is connected between the two guide pillars on the same side, and a buffer spring is sleeved on the area of ​​the guide pillar between the buffer plate and the base.

3. The fall arrester safety detection device according to claim 1, characterized in that: A magnet block is also arranged in the area of ​​each suspension rope close to the lower surface of the top plate.

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