A drop hammer locking system for a test bench for the safety performance of falling object protection structures

Abstract

This invention provides a falling hammer locking system for a falling object protection structure safety performance test bench, belonging to the technical field of falling object protection structure testing, including a self-locking mechanism; the self-locking mechanism includes a coaxially arranged rotating ring, a ring fixing rod, a release cover, a mounting base, an electromagnet, a falling hammer, a release shaft, a push rod, and a push rod drive unit; the above-mentioned falling hammer locking system has a simple structure, stable operation, and is safe and reliable, maximizing the free fall motion of the falling hammer, ensuring the accuracy of test data, and fully guaranteeing the personal safety of test operators.

Description

Technical Field

[0001] This invention belongs to the technical field of falling object protection structure testing, and specifically discloses a falling hammer locking system for a falling object protection structure safety performance test bench. Background Technology

[0002] Mining vehicles often operate in harsh underground coal mines. In coal mine roadways, due to insecure roof support or deformation of the roof and sidewalls, coal and rock masses may fall out, causing deformation or penetration of the vehicle cab and resulting in injuries or fatalities to the driver and passengers. Therefore, it is necessary to verify and ensure the safety of the cab's protection against falling objects.

[0003] A falling object protection structure safety performance test bench is an effective testing device for verifying whether the vehicle cab and passenger compartment can effectively protect the safety of drivers and passengers, such as the falling object protection structure testing device disclosed in CN208736759U. During the test, a drop hammer of a certain weight is dropped from a certain height, and the energy meets the relevant requirements of GBT_17771-2010. Therefore, the safety of the drop hammer from its fixed position to its fall is crucial during the test, but relevant research has not yet been found. Summary of the Invention

[0004] The purpose of this invention is to provide a drop hammer locking system for a test bench for the safety performance of falling object protection structures, thereby improving the safety of the drop hammer from fixation to falling during the test of falling object protection structures.

[0005] The aforementioned falling weight locking system of a falling object protection structure safety performance test bench includes a self-locking mechanism. The self-locking mechanism comprises a coaxially arranged rotating ring, a ring fixing rod, a release cover, a mounting base, an electromagnet, a falling weight, a release shaft, a push rod, and a push rod drive unit. The ring fixing rod passes vertically through the top surface of the release cover. The rotating ring and the portion of the ring fixing rod outside the release cover are rotatably connected. The top surface of the mounting base is fixedly connected to the bottom surface of the release cover, and the bottom surface is fixedly connected to the top surface of the electromagnet. The bottom surface of the electromagnet electromagnetically attracts the top surface of the falling weight. A central blind hole is formed on the top surface of the falling weight axially downwards. The release shaft has a central through hole penetrating both the top and bottom surfaces. The release shaft vertically penetrates the bottom surface of the release cover, the mounting base, and the electromagnet. The part below the electromagnet is the insertion section. The insertion section is used to insert into the central blind hole of the drop hammer and has a radial hole that communicates with the central through hole. A ball bearing is installed in the radial hole. The push rod is inserted into the central through hole of the release shaft. The locking section is located within a preset distance from the bottom surface upwards. The diameter of the locking section gradually decreases from top to bottom. The top surface of the push rod drive unit is connected to the lifting ring fixing rod, and the bottom surface is connected to the top surface of the push rod. It is used to push the push rod downwards to make the locking section squeeze the ball bearing outwards to press against the central blind hole of the drop hammer, and to pull the push rod upwards to form a radial gap between the locking section and the release shaft.

[0006] Furthermore, the self-locking mechanism also includes a set of guide components; the set of guide components is disposed on the release cover or mounting base, including multiple guide ears evenly arranged around the central axis of the release cover or mounting base; each guide ear is provided with a guide hole.

[0007] Furthermore, the self-locking mechanism also includes multiple sets of guide assemblies; the multiple sets of guide assemblies are arranged on the release cover and / or mounting base, and are arranged axially; each set of guide ear assemblies includes guide ears evenly arranged around the central axis of the release cover and / or mounting base, the arrangement of guide ears in each set of guide assemblies is the same, and each guide ear is provided with a guide hole.

[0008] Furthermore, the rotating ring is rotatably connected via a shaft I perpendicular to the ring fixing rod, with a rotation angle of 0-180° around shaft I.

[0009] Furthermore, the top surface of the push rod drive unit is connected to the lifting ring fixing rod via a traction rope.

[0010] Furthermore, the falling hammer locking system of the aforementioned falling object protection structure safety performance test bench also includes an interlocking and straightening mechanism. The interlocking and straightening mechanism is located at the preset landing point of the falling hammer below the self-locking mechanism and includes a mounting frame, a buckle, a buckle drive unit, and a locking tongue. The mounting frame is provided with a falling hammer hole that penetrates the top and bottom surfaces. The buckle is rotatably connected to the mounting frame, and its center is coaxially arranged with the center of the falling hammer hole and the center of the falling hammer. The inner wall of the buckle is provided with a roller groove. Multiple sets of locking tongues are evenly arranged around the center of the buckle. Each set of locking tongues includes a pull rod, a swing arm, and a track roller. The first end of the pull rod is rotatably connected to the buckle, and the second end is rotatably connected to the first end of the swing arm. The second end of the swing arm is rotatably mounted with a track roller, which slides along the roller groove. The buckle drive unit is used to drive the buckle to rotate and extend or retract the swing arm.

[0011] Furthermore, the push rod drive unit is a push rod cylinder; the retaining ring drive unit is a retaining ring cylinder, with both ends connected to the retaining ring and the mounting bracket respectively via pin II.

[0012] Furthermore, the first end of the pull rod is rotatably connected to the buckle via shaft III, and the second end is rotatably connected to the first end of the swing arm via shaft III. The second end of the swing arm is rotatably mounted with a track roller via shaft III.

[0013] Furthermore, the falling hammer locking system of the aforementioned falling object protection structure safety performance test bench also includes a guide rail and a lifting mechanism; the guide rail passes through the guide lug of the self-locking mechanism; the lifting mechanism is connected to the rotating ring of the self-locking mechanism; and the interlocking straightening mechanism is installed on the guide rail and located at the preset landing point of the falling hammer below the self-locking mechanism.

[0014] Furthermore, the falling hammer locking system of the aforementioned falling object protection structure safety performance test bench also includes a proximity switch and a controller; the proximity switch is installed on the guide rail and is located at the preset start position of the interlocking and straightening mechanism, and transmits a signal to the controller when a falling hammer is detected; the electromagnet, push rod drive unit, and buckle drive unit are all controlled by the controller.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The drop hammer is fixed by an electromagnet, achieving electromagnetic locking. The push rod drive unit pushes the push rod downward, causing the locking section to squeeze the ball bearings outward and press them against the center blind hole of the drop hammer, achieving mechanical locking. The double locking can prevent the drop hammer from accidentally disengaging, fully ensuring the personal safety of the test operators. When the self-locking mechanism is lifted to the preset position, the electromagnet is de-energized. At the same time, the push rod drive unit pulls the push rod upward, creating a radial gap between the locking section and the disengagement shaft. The locking section no longer squeezes the ball bearings, the mechanical locking is released, and the drop hammer tends to fall freely. The ball bearings are squeezed radially inward by the drop hammer, and the drop hammer falls freely, ensuring the accuracy of the test data.

[0017] 2. The interlocking centering mechanism works in conjunction with the self-locking mechanism. The swing arm will only fully retract and open the locking tongue when the hammer falls to the preset starting position of the interlocking centering mechanism, allowing the hammer to fall to the preset landing point through the buckle and hammer hole. In other cases, the swing arm extends and the locking tongue is in the locked state. When the hammer deviates during free fall, it will prevent the hammer from falling further, which can fully ensure the personal safety of the test operators.

[0018] 3. When the drop hammer falls to the preset landing point, the swing arm extends, the locking tongue clamps the drop hammer and straightens it so that the center blind hole of the drop hammer is aligned with the insertion section of the release shaft. The self-locking mechanism descends, and the insertion section of the release shaft is inserted into the center blind hole of the drop hammer. When the electromagnet is in contact with the drop hammer, the locking section of the push rod squeezes the ball to press it against the center blind hole of the drop hammer, completing the electromagnetic and mechanical synchronous locking, and preparing for the next test.

[0019] In summary, the aforementioned drop hammer locking system is simple in structure, stable in operation, safe and reliable, and maximizes the free fall motion of the drop hammer, ensuring the accuracy of test data while fully guaranteeing the personal safety of test operators. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the falling hammer locking system of the test bench for the safety performance of falling object protection structures;

[0022] Figure 2 This is a schematic diagram of the self-locking mechanism;

[0023] Figure 3 This is a schematic diagram of the internal workings of the self-locking mechanism;

[0024] Figure 4 This is a schematic diagram of the interlocking straightening mechanism.

[0025] In the diagram: 1-Self-locking mechanism; 1.1-Rotating ring; 1.2-Ring fixing rod; 1.3-Unhooking cover; 1.4-Mounting base; 1.5-Electromagnet; 1.6-Falling hammer; 1.7-Unhooking shaft; 1.8-Push rod; 1.9-Ball bearing; 1.10-Guide ear; 1.11-Push rod cylinder; 2-Interlocking straightening mechanism; 2.1-Mounting bracket; 2.2-Lock ring; 2.3-Pull rod; 2.4-Swing arm; 2.5-Trajectory roller; 2.6-Shaft III; 2.7-Lock ring cylinder; 2.8-Mounting plate; 3-Guide slide rail. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This embodiment provides a falling hammer locking system for a falling object protection structure safety performance test bench, including a self-locking mechanism 1, an interlocking and straightening mechanism 2, a guide rail 3, a lifting mechanism, a proximity switch, and a controller.

[0028] The self-locking mechanism 1 includes a rotating lifting ring 1.1, a lifting ring fixing rod 1.2, a release cover 1.3, a mounting base 1.4, an electromagnet 1.5, a drop hammer 1.6, a release shaft 1.7, a push rod 1.8, a push rod drive unit, and a guide assembly, all arranged coaxially.

[0029] The lifting ring fixing rod 1.2 passes vertically through the top surface of the release cover 1.3; the rotating lifting ring 1.1 and the part of the lifting ring fixing rod 1.2 located outside the release cover 1.3 are rotatably connected and connected to the lifting mechanism; the top surface of the mounting base 1.4 is fixedly connected to the bottom surface of the release cover 1.3, and the bottom surface is fixedly connected to the top surface of the electromagnet 1.5; the bottom surface of the electromagnet 1.5 is connected to the top surface of the electromagnetic hammer 1.6; the top surface of the hammer 1.6 has a central blind hole extending axially downwards; the release shaft 1.7 has a central through hole penetrating the top and bottom surfaces, and the release shaft 1.7 vertically penetrates the bottom surface of the release cover 1.3, the mounting base 1.4, and the electromagnet 1.5, with the part below the electromagnet 1.5 being a plug-in section; the plug-in section is used for A radial hole is provided in the central blind hole of the drop hammer 1.6, which communicates with the central through hole. A ball bearing 1.9 is installed in the radial hole. The push rod 1.8 is inserted into the central through hole of the release shaft 1.7. A locking section is formed within a preset distance from the bottom upward (the preset distance is mainly determined based on the length of the central through hole of the release shaft 1.7 and the position of the radial hole). The diameter of the locking section gradually decreases from top to bottom. The top surface of the push rod drive unit is connected to the lifting ring fixing rod 1.2, and the bottom surface is connected to the top surface of the push rod 1.8. This is used to push the push rod 1.8 downward to make the locking section squeeze the ball bearing 1.9 outward to press against the central blind hole of the drop hammer 1.6, and to pull the push rod 1.8 upward to form a radial gap between the locking section and the release shaft 1.7. Preferably, when the push rod drive unit reaches its maximum working stroke, the bottom surface of the push rod 1.8 is flush with the bottom surface of the central blind hole of the drop hammer 1.6. At this time, the ball bearing 1.9 firmly locks the drop hammer 1.6.

[0030] There are two cases for the guide component.

[0031] The guide assembly is a set, which is set on the unhooking cover 1.3 or the mounting base 1.4, including multiple guide ears 1.10 evenly arranged around the central axis of the unhooking cover 1.3 or the mounting base 1.4; each guide ear 1.10 is provided with a guide hole for the guide slide rail 3 to pass through.

[0032] Multiple sets of guide assemblies are arranged axially on the release cover 1.3 and / or mounting base 1.4. Each set of guide ear assemblies includes guide ears 1.10 evenly distributed around the central axis of the release cover 1.3 and / or mounting base 1.4. The arrangement of guide ears 1.10 in each set of guide assemblies is identical, and each guide ear 1.10 is provided with a guide hole for the guide rail 3 to pass through. In this embodiment, two sets of guide assemblies are provided, located on the release cover 1.3 and the mounting base 1.4 respectively, and each set of guide assemblies is provided with two guide ears 1.10.

[0033] The axial deviation of the self-locking mechanism 1 is limited by the cooperation of the guide rail 3 and the guide ear 1.10.

[0034] The rotating lifting ring 1.1 is rotatably connected by a shaft I perpendicular to the lifting ring fixing rod 1.2, and the rotation angle around shaft I is 0-180°.

[0035] The top surface of the push rod drive unit is connected to the lifting ring fixing rod 1.2 via a traction rope.

[0036] The push rod drive unit is a push rod cylinder 1.11, preferably a single-acting cylinder, which can only operate under power conditions.

[0037] The bottom surface of the hook cover 1.3 has several circular holes evenly arranged, which are fixed to the threaded holes on the mounting base 1.4 by bolts.

[0038] The interlocking and straightening mechanism 2 is installed on the guide rail 3, located at the preset landing point of the drop hammer 1.6 below the self-locking mechanism 1. It includes a mounting frame 2.1, a retaining ring 2.2, a retaining ring drive unit, and a locking tongue. The mounting frame 2.1 is provided with a drop hammer hole that passes through the top and bottom surfaces. The retaining ring 2.2 is rotatably connected to the mounting frame 2.1, and its center is coaxially arranged with the center of the drop hammer hole and the center of the drop hammer. The inner wall of the retaining ring 2.2 is provided with a roller groove. Multiple sets of locking tongues are evenly arranged around the center of the retaining ring 2.2. Each locking tongue assembly includes a pull rod 2.3, a swing arm 2.4, and a track roller 2.5. The first end of the pull rod 2.3 is rotatably connected to the retaining ring 2.2 via shaft III 2.6, and the second end is rotatably connected to the first end of the swing arm 2.4 via shaft III 2.6. The second end of the swing arm 2.4 is rotatably mounted with the track roller 2.5 via shaft III 2.6, and the track roller 2.5 slides along the roller groove. The retaining ring drive unit is used to drive the retaining ring 2.2 to rotate and extend or retract the swing arm 2.4.

[0039] The buckle drive unit is a buckle cylinder 2.7, preferably a single-acting cylinder, which can only operate under power conditions. Its two ends are connected to the mounting plate 2.8 and the mounting bracket 2.1 on the buckle 2.2 respectively through pin II.

[0040] In this interlocking straightening mechanism 2, the contact point between the retaining ring 2.2 and the retaining ring cylinder 2.7, the rotation center of the pull rod 2.3, and the rotation center of the swing arm 2.4 form a self-locking structure. This ensures that the swing arm 2.4 can only disengage under the power of the retaining ring cylinder 2.7. Furthermore, the retaining ring cylinder 2.7 is a single-acting cylinder; when there is no external air source, the air circuit is closed, or there is a sudden power outage, the entire interlocking straightening mechanism 2 remains in a self-locking state, ensuring experimental safety. The second end of the swing arm 2.4 uses a trajectory roller 2.5, which reduces friction, making the self-locking point formed by the contact point between the retaining ring 2.2 and the retaining ring cylinder 2.7, the rotation center of the pull rod 2.3, and the rotation center of the swing arm 2.4 easily broken under the action of the cylinder.

[0041] The proximity switch is installed on the guide rail 3 and is located at the preset start position of the interlocking straightening mechanism 2. When the falling hammer 1.6 is detected, it indicates that the interlocking straightening mechanism 2 has reached the start time and sends a signal to the controller.

[0042] The electromagnet 1.5, the push rod drive unit, and the buckle drive unit are all controlled by a controller.

[0043] The aforementioned drop hammer locking system is controlled by a pneumatic system, ensuring safe and reliable operation, flexibility, and no jamming. The working process is as follows:

[0044] S1, the drop hammer 1.6 is attracted and fixed by the electromagnet 1.5 to realize the electromagnetic locking of the drop hammer 1.6. The push rod drive unit pushes the push rod 1.8 downward to make the locking section squeeze the ball 1.9 outward to press the center blind hole of the drop hammer 1.6 to realize the mechanical locking of the drop hammer 1.6. The double locking can prevent the drop hammer 1.6 from accidentally disengaging. The buckle 2.2 of the interlocking and straightening mechanism 2 rotates to the extreme value in the forward direction, the swing arm 2.4 is fully extended, and the lock tongue is in the locked state.

[0045] S2, lift the self-locking mechanism 1 to the preset position, de-energize the electromagnet 1.5, and at the same time, the push rod drive unit pulls the push rod 1.8 upward to form a radial gap between the locking section and the unhooking shaft 1.7. The locking section no longer squeezes the ball 1.9, the mechanical lock is released, the drop hammer 1.6 tends to fall freely, the ball 1.9 is squeezed radially inward by the drop hammer 1.6, and the drop hammer 1.6 falls off to achieve free fall;

[0046] S3, when the drop hammer 1.6 falls to the preset start position of the interlocking straightening mechanism 2, the proximity switch sends a signal to the controller, the controller controls the buckle drive to rotate the buckle 2.2 in the opposite direction to the extreme value, the swing arm 2.4 fully retracts, the locking tongue is opened, and the drop hammer 1.6 falls to the preset landing point through the buckle 2.2 and the drop hammer hole;

[0047] S4, the controller controls the buckle drive to rotate buckle 2.2 in the forward direction, the swing arm 2.4 extends, the locking tongue clamps and straightens the drop hammer 1.6 so that the center blind hole of the drop hammer 1.6 is aligned with the insertion section of the release shaft 1.7, the remaining part of the self-locking mechanism 1 except for the drop hammer 1.6 descends, the insertion section of the release shaft 1.7 is inserted into the center blind hole of the drop hammer 1.6, until the electromagnet 1.5 is in contact with the drop hammer 1.6, the locking section of the push rod 1.8 squeezes the ball 1.9 to press it against the center blind hole of the drop hammer 1.6, completing the electromagnetic and mechanical synchronous locking;

[0048] S5, lift the self-locking mechanism 1 to the preset position, and the swing arm 2.4 of the interlocking and straightening mechanism 2 continues to extend, so that the locking tongue is in the locked state, which is convenient for the next experiment.

[0049] When there is no external air source, the air circuit is closed, or there is a sudden power outage, the entire drop hammer locking system will remain locked.

[0050] Whether it is electromagnetic locking or mechanical locking, only a vertically downward axial force is generated when the drop hammer 1.6 is unhooked, and no radial force is generated, so that the drop hammer 1.6 can achieve free fall motion.

[0051] The coordinated operation of the self-locking mechanism 1 and the interlocking uprighting mechanism 2 ensures the safe clamping of the falling hammer, preventing damage to the equipment and injury to the operators.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drop hammer locking system of a falling object protection structure safety performance test bench, characterized in that, Including self-locking mechanisms; The self-locking mechanism includes a rotating ring, a ring fixing rod, a release cover, a mounting base, an electromagnet, a drop hammer, a release shaft, a push rod, and a push rod drive unit arranged coaxially. The lifting ring fixing rod passes vertically through the top surface of the release cover; The rotating lifting ring and the part of the lifting ring fixing rod located outside the hook release cover are rotatably connected; The top surface of the mounting base is fixedly connected to the bottom surface of the release cover, and the bottom surface is fixedly connected to the top surface of the electromagnet. The bottom surface of the electromagnet electromagnetically attracts the top surface of the falling hammer. The top surface of the falling hammer is provided with a central blind hole along the axial direction downward; The unhooking shaft is provided with a central through hole that passes through the top and bottom surfaces. The unhooking shaft vertically passes through the bottom surface of the unhooking cover, the mounting base, and the electromagnet. The part located below the electromagnet is the plug-in section. The plug section is used to be inserted into the central blind hole of the drop hammer, and is provided with a radial hole that communicates with the central through hole. A ball bearing is installed in the radial hole. The push rod is inserted into the central through hole of the release shaft, and the locking section is within a preset distance from the bottom upwards. The diameter of the locking section gradually decreases from top to bottom. The top surface of the push rod drive unit is connected to the lifting ring fixing rod, and the bottom surface is connected to the top surface of the push rod. It is used to push the push rod downward to make the locking section squeeze the ball to press the center blind hole of the drop hammer, and to pull the push rod upward to form a radial gap between the locking section and the unhooking shaft. The self-locking mechanism also includes a set of guide components; A set of guide components is provided on the release cover or mounting base, including multiple guide ears evenly arranged around the central axis of the release cover or mounting base; Each guide ear is provided with a guide hole; The falling hammer locking system of the falling object protection structure safety performance test bench also includes an interlocking uprighting mechanism; The interlocking and straightening mechanism is located at the preset landing point of the hammer below the self-locking mechanism, and includes a mounting bracket, a buckle, a buckle drive unit, and a locking tongue; The mounting bracket is provided with a drop hammer hole that runs through the top and bottom surfaces; The buckle is rotatably connected to the mounting bracket, and its center is coaxially arranged with the center of the drop hammer hole and the center of the drop hammer. The inner wall of the buckle is provided with a roller groove. Multiple sets of locking tongues are evenly distributed around the center of the locking ring, and each set of locking tongues includes a pull rod, a swing arm, and a track roller; The first end of the pull rod is rotatably connected to the buckle, and the second end is rotatably connected to the first end of the swing arm. The second end of the swing arm is rotatably equipped with a track roller, which slides along the roller groove. The buckle drive unit is used to drive the buckle to rotate and extend or retract the swing arm.

2. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, The self-locking mechanism also includes multiple sets of guide components; Multiple sets of guide assemblies are mounted on the release cover and / or mounting base, arranged axially; Each guide ear assembly includes guide ears evenly arranged around the central axis of the release cover and / or mounting base. The arrangement of guide ears in each guide assembly is the same, and each guide ear is provided with a guide hole.

3. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, The rotating ring is rotatably connected by a shaft I perpendicular to the ring fixing rod, and the rotation angle around shaft I is 0-180°.

4. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, The top surface of the push rod drive unit is connected to the lifting ring fixing rod by a traction rope.

5. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, The push rod drive unit is a push rod cylinder; The buckle drive unit is a buckle cylinder, with both ends connected to the buckle and the mounting bracket respectively via pin II.

6. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, The first end of the pull rod is rotatably connected to the buckle via shaft III, and the second end is rotatably connected to the first end of the swing arm via shaft III. The second end of the swing arm is rotatably mounted with a track roller via shaft III.

7. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, It also includes guide rails and lifting mechanisms; The guide rail passes through the guide lug of the self-locking mechanism; The lifting mechanism is connected to the rotating lifting ring of the self-locking mechanism; The interlocking centering mechanism is installed on the guide rail and is located at the preset landing point of the drop hammer below the self-locking mechanism.

8. The falling hammer locking system of the falling object protection structure safety performance test bench according to claim 1, characterized in that, It also includes proximity switches and controllers; The proximity switch is mounted on the guide rail and is located at the preset start position of the interlocking uprighting mechanism. When the falling hammer is detected, it transmits a signal to the controller. The electromagnet, push rod drive, and buckle drive are all controlled by a controller.

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