A harness impact test device and test method

Abstract

The present application provides a kind of harness impact test device and test method, operate with two semicircular buckles, semicircular buckle is located in the end of operating band, left and right ends of main cover plate each has a semicircular boss, left and right symmetrically arranged protruding vertical baffle in middle part, semicircular boss is symmetrically opened with countersunk hole between vertical baffle;Side limit block, center limit block and side limit block are sequentially placed, coaxial center hole is arranged on it, force center shaft passes through center hole so that semicircular buckle is located between left and right symmetrically arranged limit block and center limit block, and force center shaft is fixed with the same two main cover plates at both ends.Semicircular buckle and impact test device relative position do not change, harness double shoulder stress is uniform;Each fastener is hidden through countersunk hole, to prevent hooking;Change test dummy structure, and increase steel wire rope as guide, so that dummy free fall, along vertical steel wire rope sliding, control dummy posture, avoid dummy roll.

Description

TECHNICAL FIELD

[0001] The present application belongs to lifesaving equipment, and particularly relates to a harness impact test device. BACKGROUND

[0002] The harness is a fastening device of a lifesaving parachute and a human body, and the strength index of the harness must meet the requirement of maximum opening force. Therefore, in order to verify the strength index of the harness structure, the impact test is needed to simulate the impact load generated by the parachute in the air when the parachute is opened, so as to check whether the harness system strength and function are normal.

[0003] When the ground impact test is performed, the dummy-harness system needs to be connected into the impact test system through a connecting device. With the increase of the frequency of use of the impact test platform, the technical index of the harness is continuously developed, and the existing test device is not conducive to the development of the harness product. The following technical problems exist:

[0004] 1) The existing device cannot limit the rotation of the semicircular buckle on the operating belt, so that the force on the two shoulders of the harness is uneven during the whole impact process, and even the force on one side may be single, which leads to data distortion and affects the evaluation of the performance of the product;

[0005] 2) During the falling process of the dummy-harness, the dummy rolls seriously and the posture cannot be controlled, which leads to a high proportion of invalid test;

[0006] 3) The existing test device cannot avoid hooking during the impact process, which leads to damage of the harness;

[0007] 4) The existing test device has low strength, and the loading and unloading procedures are complex, so that the operation difficulty of the test personnel is high. SUMMARY

[0008] The purpose of the present application is to solve the above problems existing in the impact test, and an impact test device is provided. The device has high structural strength, is simple to install and disassemble, can effectively limit the relative position of the semicircular buckle, and can ensure that the shoulder width of the harness does not change during the impact.

[0009] The technical solution of the present application is as follows: a harness impact test device, comprising a main cover plate, a bearing center shaft, a side limit block, a center limit block and a semicircular buckle, one side operating belt has two semicircular buckles, the semicircular buckles are located at the end of the operating belt, each of the left and right ends of the main cover plate has a semicircular boss, a protruding vertical baffle plate is symmetrically arranged in the middle, and a countersunk hole is symmetrically formed between the semicircular boss and the vertical baffle plate; the side limit block, the center limit block and the side limit block are sequentially placed, coaxial center holes are arranged on them, the bearing center shaft passes through the center holes so that the semicircular buckles are located between the symmetrically arranged limit blocks and the center limit block, and the two ends of the bearing center shaft are fixed with the two main cover plates arranged oppositely.

[0010] The middle section of the force center shaft is cylindrical, and the side limit block, the center limit block and the side limit block are sequentially arranged on the cylindrical section.

[0011] The test device further comprises a fastening nut located between the two main cover plates, and the ends of the force center shaft are provided with threads for threaded connection with the fastening nut.

[0012] The test device further comprises a limiting screw, the ends of the force center shaft are cylindrical bosses, the cylindrical bosses are inserted into the countersunk through holes provided on the main cover plate, the threaded outer end surface is in contact with the main cover plate, and the limiting screw clamps the main cover plate to the force center shaft; one end of the limiting screw is a screw rod for cooperation with the fastening nut, and the other end is a round cap which is completely sunk into the countersunk hole of the main cover plate, so that the limiting screw will not be hooked with the operating belt during the impact process.

[0013] The middle of the main cover plate is provided with a convex groove for weight reduction and convenient carrying, and eight countersunk through holes are symmetrically arranged at both ends. The four countersunk through holes in the outermost two vertical rows form a group, and the center distance between the left and right circles is designed according to different shoulder widths of the harness. The four countersunk through holes in the innermost two vertical rows form a group, and the center distance between the left and right circles is determined according to different shoulder widths of the harness.

[0014] The test device further comprises two rope rings of the "person" type belt, and the force center shaft has four pieces. The upper two pieces of the force center shaft form a group, and the lower two pieces form a group. The upper two pieces of the force center shaft pass through the two rope rings of the "person" type belt to fix the rope rings of the "person" type belt between the two main cover plates. The lower two pieces of the force center shaft pass through the center through holes of the side limit block and the center limit block, and the fastening nut is used to cooperate with the force center shaft in threaded connection to firmly fix the side limit block, the center limit block and the semicircular buckle on the force center shaft.

[0015] One side of the side limit block is a plane, and the other side has a rectangular groove at the bottom. The length of the rectangular groove is equal to the length of one end of the semicircular buckle screw rod, and the diameter of one end of the semicircular buckle screw rod is greater than that of the semicircular end. The one end of the semicircular buckle screw rod is embedded in the rectangular groove to limit the rotation of the semicircular buckle.

[0016] The test device further comprises a torso dummy, and the arms and legs of the torso dummy are welded with sliding blocks. The sliding blocks are provided with cylindrical through holes in the vertical direction, and the center lines of the cylindrical through holes of the arms and legs on the same side coincide.

[0017] The test device further comprises two steel wires, which pass through the cylindrical through holes of the arms and legs of the torso dummy respectively, are fixed to the top fixed hook of the impact test table (14) at the upper end, and are fixed to the ground at the lower end.

[0018] A harness impact test method, comprising the following steps

[0019] Step one, the harness is worn on the torso dummy in the product use state, and the adjusting buckles of the harness are tightened, the two steel wires are passed through the cylindrical through holes of the arms and legs of the torso dummy, and the two steel wires are pulled straight and taut on the ground.

[0020] Step two, the lower end operating belt of the assembled impact test device is connected with the harness on the torso dummy on the ground, and the upper end ring of the impact test device is sequentially connected with the force sensor 11 and the remote control disengaging lock. The harness impact test is the final non-falling air impact test of the dummy. At this time, since the dummy system is on the ground, the stroke rope length is insufficient, and it cannot be connected into the impact test system temporarily.

[0021] Step three, the impact test bench lifting hook is lowered to a position 1 meter away from the ground, the upper end of the remote control disengaging lock is connected with the lifting hook, the impact test bench hook is controlled, the lifting hook height is raised, the remote control disengaging lock, the force sensor, the impact test device and the torso dummy are raised, and the impact system is raised to a certain height. At this time, the force sensor is connected with the stroke rope, the remote control disengaging lock is still connected with the impact test bench hook, and the force sensor is connected with the stroke rope and the remote control disengaging lock at the same time.

[0022] Step four, the impact test bench is controlled, the lifting hook is lowered until the stroke rope is pulled straight, at this time it is the final falling height of the impact test system, and the height is recorded.

[0023] Step five, the impact test bench lifting hook is raised, and the impact test system is raised to a predetermined height.

[0024] Step six, during the test, the remote control disengaging lock is opened, the dummy-harness system freely falls along the steel wire until the stroke rope is pulled straight, the impact test is completed, and the force curve in the impact process is collected by the force sensor.

[0025] The beneficial effects of the present application are: 1) by designing the main cover plate and designing the semicircular boss and vertical baffle thereon, cooperating with the structure of the force bearing center shaft, the side limiting block and the center limiting block, the semicircular buckle is clamped tightly, the relative position of the semicircular buckle and the impact test device is not changed during the whole test process, and the force on the double shoulders of the harness is uniform; 2) the impact test device hides each fastener through the countersunk hole to prevent hooking; 3) the structure of the test dummy is changed, and the steel wire is added as a guide, so that when the dummy freely falls, it slides along the vertical steel wire, the posture of the dummy is controlled, and the dummy is prevented from rolling; 4) each component part of the design is exposed, which is convenient for test personnel to observe whether the structure is intact and convenient for troubleshooting safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 、 Figure 2 It is a schematic view of the assembly relationship of the impact test device.

[0027] Figure 3The figure is a schematic diagram of the connection between the impact testing device of the present application and the V-belt and the operating belt.

[0028] Figure 4 The figure is a schematic diagram of the assembly of the semi-circular buckle of the present application.

[0029] Figure 5 The figure is a sectional view of the assembly of the semi-circular buckle of the present application.

[0030] Figure 6 The figure is a schematic diagram of the assembly of the semi-circular buckle and the side limiting block of the present application.

[0031] Figure 7 The figure is a schematic diagram of the main cover plate of the present application.

[0032] Figure 8 The figure is a schematic diagram of the limiting screw of the present application.

[0033] Figure 9 The figure is a schematic diagram of the force-bearing center shaft of the present application.

[0034] Figure 10 The figure is a schematic diagram of the center limiting block groove of the present application.

[0035] Figure 11 The figure is a schematic diagram of the V-belt used in the present application.

[0036] Figure 12 The figure is a schematic diagram of the torso dummy of the present application.

[0037] Figure 13 The figure is a schematic diagram of the impact test of the present application.

[0038] Figure 14 The figure is a schematic diagram of the impact test of the present application.

[0039] The figure is a schematic diagram of the impact test of the present application. DETAILED DESCRIPTION

[0040] A harness impact test device, comprising a main cover plate 1, a semicircular boss 1a, an upright baffle 1b, an outer side countersunk hole 1c, an inner side countersunk hole 1d, a limiting screw 2, a screw rod 2a, a round cap 2b, a groove 2c, a fastening nut 3, a force center shaft 4, an M20 thread 4a, a boss 4b, a threaded hole 4c, a side limiting block 5, a center limiting block 6, a dummy 7, a steel wire rope 8, a control belt 9, a herringbone belt 10, an upper end circular ring 10a, a lower end circular ring 10b, a force sensor 11, a remote control release lock 12, a stroke rope 13, an impact test bench 14, a semicircular buckle 15, a semicircular buckle screw rod 15a and a semicircular buckle semicircular end 15b.

[0041] The main cover plate 1 is a main force component of the impact device, which is processed by heat treatment of high-strength steel. Each set of impact test device contains two main cover plates 1, which are left-right symmetrical structures, and eight 16mm diameter countersunk holes are symmetrically opened on the main cover plates 1. The outermost two vertical rows of four countersunk holes 1c are a group, and the left and right center distance is 270mm. The innermost two vertical rows of four countersunk holes 1d are a group, and the left and right center distance is 200mm. The two distances are designed according to different harness shoulder widths. The main cover plate 1 has a semicircular boss 1a at each of the left and right ends, and two 5mm thick protruding upright baffles 1b in the middle. The semicircular boss 1a can limit the position of the side limiting block 5 and the center limiting block 6 when the outermost two vertical rows of holes 1c are used for assembly, preventing them from rotating around the force center shaft 4. The 5mm thick protruding upright baffles 1b can limit the position of the side limiting block 5 and the center limiting block 6 when the innermost two vertical rows of countersunk holes 1d are used for assembly, preventing them from rotating around the force center shaft 4. By limiting the rotation of the side limiting block 5 and the center limiting block 6, the force on the two control belts during the entire impact test process is ensured to be uniform. The main cover plate 1 has a "convex" groove in the middle, which can reduce weight and facilitate hand carrying.

[0042] The limiting screw 2 has an M4 screw rod 2a at one end, which cooperates with the threaded hole 4c on the force center shaft 4. The other end of the limiting screw 2 is a round cap 2b, which has a 2mm deep groove 2c. Each set of impact test device needs to use eight limiting screws 2. When assembling the impact test device, the two main cover plates 1 clamp the force center shaft 4, and then the screw rod 2a of the limiting screw 2 is assembled with the threaded hole 4c on the force center shaft 4. The round cap 2b of the limiting screw 2 can tightly press the main cover plate 1 on the force center shaft 4. At the same time, the round cap 2b of the limiting screw 2 is completely sunk into the countersunk hole of the main cover plate 1, which ensures that the limiting screw 2 will not hook with the control belt during the impact process. The groove 2c is used to tighten the screw rod 2a of the limiting screw 2 after assembly with the threaded hole 4c. During the impact test process, the limiting screw 2 plays a role in tightly pressing the main cover plate 1 and the force center shaft 4, and does not bear the impact force.

[0043] The fastening nut 3 is a hexagonal center M20 nut, the center thread cooperates with the M20 thread 4a on the left and right sides of the force center shaft 4, and four fastening nuts 3 are required for each set of impact testing device. The side limiting block 5 and the center limiting block 6 are tightly fitted with the two semicircular buckles, and then are sleeved into the force center shaft 4. The fastening nut 3 is used to cooperate with the M20 thread 4a on the force center shaft 4 to fix the side limiting block 5 and the center limiting block 6 in the middle position of the force center shaft 4 and to press them tightly.

[0044] The force center shaft 4 is a cylindrical structure, which is the main force component of the impact device and needs to be processed by using high-strength steel and heat treatment. The middle section of the force center shaft 4 is cylindrical, and the two ends are processed with M20 threads 4a for cooperation with the fastening nut 3. The outer end of the M20 thread on the left and right sides has a cylindrical boss 4b with a height of 5 mm, and the outer diameter of the boss is 15 mm. When assembled, the two 5 mm high bosses 4b at the outermost end of the force center shaft 4 can be inserted into the through hole on the main cover plate 1, and the diameter of the M20 thread 4a is larger than the diameter of the countersunk through hole on the main cover plate, so the outer end surface of the M20 thread 4a is in contact with the main cover plate 1. The M4 screw 2a is used to cooperate with the threaded hole 4c to fasten the main cover plate 1 tightly to the force center shaft 4. Four force center shafts 4 are required for each set of impact testing device. When the impact testing device is assembled, the two force center shafts 4 assembled with the countersunk through hole at the upper end of the main cover plate 1 pass through the lower ring 10b of the herringbone belt, and the herringbone belt ring is fixed between the two main cover plates 1. The two force center shafts 4 assembled with the countersunk through hole at the lower end of the main cover plate 1 pass through the center through hole of the side limiting block 5 and the center limiting block 6, and the fastening nut 3 is used to cooperate with the M20 thread 4a on the force center shaft 4 to tightly fix the side limiting block 5, the center limiting block 6 and the semicircular buckle on the force center shaft 4.

[0045] The side limiting block 5 is used to cooperate with the center limiting block 6 to tightly clamp the semicircular buckle, and the center has a through hole with a diameter of 21 mm for passing through the force center shaft 4. Four side limiting blocks 5 are required for each set of impact testing device. One side of the side limiting block 5 is a plane, and the other side has a rectangular groove at the bottom, and the length of the groove is equal to the length of the screw 15a on the semicircular buckle 15. Because the diameter of the semicircular buckle screw 15a is larger than the diameter of the semicircular end 15b of the semicircular buckle, when installed, the one end of the semicircular buckle screw 15a is embedded in the rectangular groove, which can limit the rotation of the semicircular buckle. In actual impact testing, one side is operated with two semicircular buckles, and the assembly sequence is "side limiting block 5-semicircular buckle 15-center limiting block 6-semicircular buckle 15-side limiting block 5" in turn. After assembly, they pass through the force center shaft 4 and are placed in the middle section of the force center shaft 4. The fastening nut 3 is used to cooperate with the M20 thread 4a on the force center shaft 4 to clamp the side limiting block 5, the center limiting block 6 and the semicircular buckle 15.

[0046] The center limiting block 6 is used to clamp the semicircular buckle 15 in cooperation with the side limiting block 5, and has a through hole with a diameter of 21 mm in the center, which is used to pass through the load bearing center shaft 4. Two sets of impact test devices need to use two center limiting blocks 6. The center limiting block 6 has a rectangular groove on both sides, and the outer shape is consistent with the side limiting block 5, which can limit the rotation of the semicircular buckle. In the actual impact test, one side of the operating belt has two semicircular buckles 15, so the assembly sequence is "side limiting block 5-semicircular buckle 15-center limiting block 6-semicircular buckle 15-side limiting block 5" in turn. After assembly is completed, the load bearing center shaft 4 is passed through, and is placed in the middle of the load bearing center shaft 4. The tightening nut 3 is used in cooperation with the M20 screw thread 4a on the load bearing center shaft 4 to clamp the side limiting block 5, the center limiting block 6 and the semicircular buckle 15.

[0047] The torso dummy 7 is a special dummy for impact test. The torso dummy 7 has sliding blocks welded on the arms and legs. The sliding blocks have cylindrical through holes in the vertical direction. The center lines of the cylindrical through holes of the sliding blocks on the arms and legs of the same side of the torso dummy 7 coincide. In the impact test, the steel wire rope is passed through the cylindrical through holes. When the torso dummy 7 freely falls, the torso dummy 7 can slide down along the steel wire rope, thereby avoiding the swing of the dummy.

[0048] The steel wire rope 8 has a diameter of 20 mm. The upper end is fixed to the fixed hook at the top of the impact test table 14, and the lower end is fixed to the ground. In the impact test, two steel wire ropes 8 are respectively passed through the cylindrical through holes of the sliding blocks on the arms and legs of the torso dummy 7, and are pulled straight and tight. In the impact test, the dummy can fall down along the steel wire rope, thereby preventing the dummy from rolling.

[0049] The operating belt 9 is a spare part of the back belt, which is a textile part and is used as a connecting part between the back belt and the impact clamp plate. One set of impact test device contains four operating belts 9. Each operating belt 9 is connected with a semicircular buckle 15.

[0050] The garter 10 has an outer shape similar to the Chinese character "person" and is a textile part. The three end points of the garter 10 are respectively sewn to form a circular ring. The single upper end circular ring 10a is connected with the force sensor 11, and the two lower end circular rings 10b are sleeved into the load bearing center shaft 4. The lower end circular ring 10b of the garter 10 is fixed between the two main cover plates 1.

[0051] The force sensor 11 is used to test and record the force curve felt in the impact process. The upper end is connected with the remote control disengaging lock 12, and the lower end is connected with the upper end circular ring 10a of the garter.

[0052] The remote control disengaging lock 12 includes a battery, an electric lock, a clamp plate and the like. When the test system is lifted to a predetermined height, a signal is given through the ground remote control to provide a transient current for the electric lock. The hook of the lock is opened, and the dummy-back belt system freely falls under the action of gravity.

[0053] The stroke rope 13 is a textile material, the upper end is fixed with a force hook connected with the top of the impact test bench 14, and the lower end is connected with a force sensor. When the test system is lifted to a predetermined height, at this time the stroke rope 13 is in a relaxed state, after opening the remote control disengagement lock 12, the dummy-back belt system falls until the stroke rope 13 is straightened, the system no longer falls, the test is completed, and the height of the dummy falling is the effective stroke height of the impact test.

[0054] The impact test bench 14 is a special equipment for impact test. The top end has three fixed hooks, one lifting hook, the center fixed hook is used to connect with the stroke rope 13, the two fixed hooks on the sides are fixedly connected with the steel wire rope 8, and the lifting hook is used to lift the impact test system.

[0055] Assembly steps:

[0056] First, assemble the half-round buckle 15 fixed part, and place them in the order of "side limit block 5-half-round buckle 15-center limit block 6-half-round buckle 15-side limit block 5", then pass through the force center shaft 4 and place it in the center of the force center shaft 4, and use two fastening nuts 3 to cooperate with the M20 threaded part 4a of the force center shaft 4 and fasten.

[0057] Secondly, pass the other two force center shafts 4 into the lower end ring 10b of the garter belt and place them in the center, at this time the garter belt ring does not need to be fixed with fastening nuts 3.

[0058] Finally, use two main cover plates 1 to clamp the two assembled half-round buckle fixed parts and garter belt parts, and the 5mm high cylindrical boss of the outermost force center shaft 4 needs to pass through the through hole of the main cover plate 1. Use the M4 threaded rod 2a of the limit screw 2 to cooperate with the threaded hole 4c of the force center shaft 4 and fasten, and ensure that the circular surface of the limit screw 2 sinks into the countersunk hole of the main cover plate 1.

[0059] The impact test method of the belt impact test device is as follows:

[0060] Step one, wear the belt on the torso dummy 7 according to the product use state, tighten the adjusting buckles of the belt, pass the two steel wire ropes 8 through the cylindrical through holes of the arms and legs of the torso dummy 7, and pull the two steel wire ropes 8 straight and tight on the ground.

[0061] Step two, connect the lower end operating belt 9 of the impact test device assembled on the ground with the belt on the torso dummy 7, and connect the upper ring 10a of the impact test device with the force sensor 11 and the remote control disengagement lock 12 in turn. The belt impact test is an empty impact test of the dummy without falling to the ground, at this time the length of the stroke rope 13 is insufficient, and it cannot be connected into the impact test system temporarily.

[0062] Step three, lower the lifting hook of the impact test bench 14 to 1 meter from the ground, connect the upper end of the remote control release lock 12 with the lifting hook, control the lifting hook of the impact test bench 14, raise the height of the hook, and the remote control release lock 12, force sensor 11, impact test device and torso dummy 7 follow the rising, after the impact system is raised to a certain height, connect the force sensor 11 with the stroke rope 13, at this time the remote control release lock 12 is still connected with the lifting hook of the impact test bench 14, and the force sensor is connected with the stroke rope 13 and the remote control release lock 12 at the same time.

[0063] Step four, control the impact test bench 14 to lower the lifting hook until the stroke rope 13 is straightened under tension, at this time it is the final drop height of the impact test system, and the height is recorded.

[0064] Step five, raise the lifting hook of the impact test bench 14 to raise the impact test system to the predetermined height.

[0065] Step six, during the test, open the remote control release lock 12, and the dummy-back strap system falls freely along the steel wire rope 8 until the stroke rope 13 is straightened, the impact test is completed, and the force sensor 11 collects the force curve during the impact process.

[0066] Implementation case: According to statistics, more than 30 back strap impact tests have been successfully carried out since 2021, the test effect is remarkable, the posture of the dummy in the air is greatly optimized, the test procedure is smooth, the back strap is intact without damage, and no abnormal situations such as system hooking occur, the success rate of impact test is greatly improved, and the smooth completion of the test verification of multiple back strap models under research of the company is ensured.

Claims

1. A strap impact testing device, comprising a main cover plate (1), a limiting screw (2), a load-bearing central shaft (4), a side limiting block (5), a central limiting block (6), a wire rope (8), a stroke rope (13), and a semi-circular buckle (15), wherein a single-sided operating strap has two semi-circular buckles (15), the semi-circular buckles (15) being located at the end of the operating strap, characterized in that, The main cover plate (1) has a semicircular boss (1a) at each of the left and right ends, and a protruding vertical baffle (1b) is symmetrically arranged in the middle. Sunk through holes are symmetrically opened between the semicircular boss (1a) and the vertical baffle (1b); the force-bearing center shaft (4) has a cylindrical boss at the two ends, which is inserted into the sunk through hole arranged on the main cover plate (1), so that the threaded outer end surface is in contact with the main cover plate (1), and the limiting screw (2) clamps the main cover plate (1) to the force-bearing center shaft (4); one end of the limiting screw (2) is a screw rod, which is used in cooperation with the fastening nut (3); the other end is a round cap (2b), which is completely sunk into the sunk hole on the main cover plate (1), so that the limiting screw (2) will not be hooked with the operating belt during the impact process; the middle section of the force-bearing center shaft (4) is cylindrical, and the side limiting block (5), the center limiting block (6) and the side limiting block (5) are sequentially arranged on the cylindrical section; the side limiting block (5), the center limiting block (6) and the side limiting block (5) are sequentially placed, and coaxial center holes are arranged on them, the force-bearing center shaft (4) passes through the center holes so that the semicircular buckles (15) are respectively located between the symmetrically arranged side limiting blocks (5) and the center limiting blocks (6), and the force-bearing center shaft (4) is fixed with the two oppositely arranged main cover plates (1); the steel wire rope (8) is two, which passes through the cylindrical through holes of the upper arms and legs of the dummy (7) respectively, and is fixed to the top fixed hook of the impact test bench (14) at the upper end and to the ground at the lower end; the stroke rope (13) is made of textile material, and the upper end is connected with the top fixed force hook of the impact test bench (14), and the lower end is connected with the force sensor; when the test system is lifted to a predetermined height, the stroke rope (13) is in a relaxed state at this time.

2. A harness impact testing apparatus according to claim 1, wherein The test device further comprises a fastening nut (3), which is located between the two main cover plates (1), and the ends of the force-bearing center shaft (4) are provided with threads and are threadedly connected with the fastening nut (3).

3. A harness impact testing apparatus according to claim 1, wherein The main cover plate (1) has a convex groove in the middle for weight reduction and convenient carrying, and eight sunk through holes are symmetrically opened at the two ends. The four sunk through holes on the outermost side form a group, and the center distance between the left and right centers is designed according to different shoulder widths of the harness. The four sunk through holes on the inner side form a group, and the center distance between the left and right centers is determined according to different shoulder widths of the harness.

4. A harness impact testing apparatus according to claim 3, wherein The test device further comprises two rope rings of the "person” type, and the force-bearing center shaft (4) is four. The upper two force-bearing center shafts (4) form a group, and the lower two force-bearing center shafts (4) form a group. The upper two force-bearing center shafts (4) pass through the two rope rings of the "person” type, and the rope rings of the person type are fixed between the two main cover plates (1); the lower two force-bearing center shafts (4) pass through the center through holes of the side limiting block (5) and the center limiting block (6), and the fastening nut (3) is threadedly connected with the force-bearing center shaft (4) to firmly fix the side limiting block (5), the center limiting block (6) and the semicircular buckle on the force-bearing center shaft (4).

5. A harness impact testing apparatus according to claim 4, wherein The side limiting block (5) has one flat surface and the other surface has a rectangular groove at the bottom, the length of the rectangular groove is equal to the length of the one end of the half-circular buckle screw rod, and the diameter of the one end of the half-circular buckle screw rod is greater than the diameter of the one end of the half-circular buckle, so that the one end of the half-circular buckle screw rod is embedded into the rectangular groove to limit the rotation of the half-circular buckle.

6. A harness impact testing apparatus according to claim 1, wherein The test device further comprises a torso dummy (7), the torso dummy (7) is welded with a sliding block on the arm and the leg, the sliding block is provided with a cylindrical through hole in the vertical direction, and the cylindrical through hole center lines of the arm and the leg on the same side coincide.

7. The test method of a harness impact test apparatus according to any one of claims 1 to 6, characterized by, The method comprises the following steps: Step one, wearing the harness on the torso dummy (7) in the product use state, and tightening the adjusting buckles of the harness, the two steel wires (8) are pulled through the cylindrical through holes of the arms and the legs of the torso dummy (7), and the two steel wires (8) are pulled straight on the ground; Step two, connecting the lower end control belt (9) of the impact test device assembled on the ground to the harness on the torso dummy (7), and sequentially connecting the upper end ring (10a) of the impact test device to the force sensor (11) and the remote control disengaging lock (12); the harness impact test is the final non-falling air impact test of the dummy, at this time, the stroke rope (13) is not long enough to be connected to the impact test system because the dummy system is on the ground; Step three, lowering the lifting hook of the impact test platform (14) to a position one meter away from the ground, connecting the upper end of the remote control disengaging lock (12) to the lifting hook, controlling the lifting hook of the impact test platform (14), lifting the height of the lifting hook, and lifting the remote control disengaging lock (12), the force sensor (11), the impact test device and the torso dummy (7) together, connecting the force sensor (11) to the stroke rope (13) after the impact system is lifted to a certain height, at this time, the remote control disengaging lock (12) is still connected to the lifting hook of the impact test platform (14), and the force sensor is connected to the stroke rope (13) and the remote control disengaging lock (12) at the same time; Step four, controlling the impact test platform (14) to lower the lifting hook until the stroke rope (13) is pulled straight, at this time, the height is the final falling height of the impact test system, and the height is recorded; Step five, lifting the lifting hook of the impact test platform (14) to lift the impact test system to a predetermined height; Step six, during the test, opening the remote control disengaging lock (12), and allowing the dummy-harness system to freely fall along the steel wire (8) until the stroke rope (13) is pulled straight, completing the impact test, and the force sensor (11) collects the force curve in the impact process.

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