CN214912815U - Anti-falling protector and vertical ladder climbing protection device with same - Google Patents
Anti-falling protector and vertical ladder climbing protection device with same Download PDFInfo
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- CN214912815U CN214912815U CN202022682904.0U CN202022682904U CN214912815U CN 214912815 U CN214912815 U CN 214912815U CN 202022682904 U CN202022682904 U CN 202022682904U CN 214912815 U CN214912815 U CN 214912815U
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Abstract
The utility model relates to a falling protector and a vertical ladder climbing protection device with the same, belonging to the technical field of oil drilling safety, the utility model discloses a falling protector, which comprises an outer shell, a track sliding body, a pulley and a shifting fork braking arm; the track sliding body is obliquely provided with a sliding chute, and the pulley can move along the sliding chute through the locking shaft; when the pulley is positioned at the lower end of the sliding chute, the distance between the pulley and the bottom surface of the outer shell is greater than the diameter of the guide steel wire rope; when the lower end of the shifting fork brake arm is pulled upwards, the upper end of the shifting fork brake arm can drive the pulley to slide to the lower end of the sliding chute, and the anti-falling protector can freely slide along the guide steel wire rope; when the lower end of the shifting fork brake arm is pulled downwards, the shifting fork brake arm can enable the pulley to slide to the upper end of the sliding groove, and the anti-falling protector is clamped on the guide steel wire rope. The utility model relates to a slide freely, protector that factor of safety is high.
Description
Technical Field
The utility model belongs to the technical field of oil drilling safety technique and specifically relates to a protection device is climbed to vertical ladder that falls protector and have it that falls is related to.
Background
At present, when oil field drilling rig derrick worker operation in oil industry, need often climb the derrick racking platform and carry out the operation, be careless a little in the climbing vertical ladder in-process, probably cause the danger of falling, cause major accident.
At present, in the petroleum drilling process, climbing protection devices used by various units are uneven, and mainly have the following problems and defects. Firstly, the protector has structural defects, when a worker climbs a straight ladder downwards from a derrick, the protector is locked with a guide steel wire rope, and the worker cannot climb smoothly; secondly, the strength of the shell of the protector is insufficient, when a person suddenly falls, the shell of the protector deforms due to overlarge impact force, and the climbing person falls; and thirdly, a protector locking system is insensitive, the protector and the shell cannot be tightly meshed with a guide steel wire rope, and falling personnel cannot be locked in time.
Therefore, how to provide a protector with a high safety factor and a free sliding is an important technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a protector and have its vertical ladder climbing protection device prevents falling to solve current climbing protection device safe detailed number low, the unsmooth technical problem of slip, can guarantee that the climbing personnel slides freely on the vertical ladder, when the staff falls suddenly, can be in time firm locking guarantee staff safety on direction wire rope.
The utility model discloses the technical scheme who adopts does: a fall-preventing protector comprises an outer shell, a track sliding body, a pulley and a shifting fork brake arm;
the track sliding body is riveted by two track plates, sliding grooves with the same direction are arranged at corresponding positions of the two track plates, the pulley is arranged between the two track plates, locking shafts at two sides of the pulley are positioned in the sliding grooves at the corresponding positions, and the pulley can move along the sliding grooves through the locking shafts;
the outer shell is of a U-shaped structure, the track sliding body is arranged inside the outer shell, the guide steel wire rope can be arranged between the arc-shaped bottom surface of the U-shaped structure and the pulley in a penetrating mode, the sliding chute is obliquely arranged on the track plate, when the pulley is located at the upper end of the sliding chute, the guide steel wire rope can be matched with the outer shell to compress the guide steel wire rope, and when the pulley is located at the lower end of the sliding chute, the distance between the pulley and the bottom surface of the outer shell is larger than the diameter of the guide steel wire rope;
the shifting fork braking arms are arranged between the outer shell and the track sliding body, the number of the shifting fork braking arms is two, the shifting fork braking arms are symmetrically arranged on the outer side of the track sliding body, and the middle parts of the shifting fork braking arms are rotationally connected with the track sliding body; the upper ends of the two shifting fork brake arms are respectively connected with the locking shafts at corresponding positions; the lower ends of the two shifting fork brake arms are mutually connected and can be detachably connected with a safety belt of a worker;
when the lower end of the shifting fork brake arm is pulled upwards, the upper end of the shifting fork brake arm can drive the pulley to slide to the lower end of the sliding chute, and the anti-falling protector can freely slide along the guide steel wire rope; when the lower end of the shifting fork brake arm is pulled downwards, the shifting fork brake arm can enable the pulley to slide to the upper end of the sliding groove, and the anti-falling protector is clamped on the guide steel wire rope.
Preferably, the shell body is pressed into a U-shaped structure by a steel plate, the bottom of the U-shaped structure is an arc-shaped slideway, a part of structure on one side surface of an opening at the upper end is bent downwards to form an L-shaped ear hole, and a U-shaped groove is arranged at the corresponding position of the opposite side surface.
Preferably, the track sliding body is connected with the outer shell through a 7-shaped bent rod, the straight end of the 7-shaped bent rod is arranged in a hole in the upper part of the track sliding body in a penetrating manner, a spring pin can be arranged in the middle of the 7-shaped bent rod, and the spring pin is positioned between the two track plates; the elbow part of the 7-shaped bent rod penetrates into the ear hole on one side of the outer shell and can be provided with a limiting pin to prevent the limiting pin from being separated from the ear hole; the straight end part of the 7-shaped bent rod is clamped in the U-shaped groove.
Preferably, the end part of the straight end of the 7-shaped bent rod is further connected with an elastic safety pin shaft through a rope, and the elastic safety pin shaft can be inserted into the concentric shafts of the outer shell and the track sliding body.
Preferably, a spring plunger is installed in a central hole of the elastic safety pin shaft, a marble is installed on the side face of the tail end of the elastic safety pin shaft, the marble is connected with the spring plunger through a spring and a push rod, when a button of the spring plunger is pressed, the marble retracts into the elastic safety pin shaft, and the elastic safety pin shaft can be smoothly inserted into or pulled out of the outer shell; when the button is released, the marble is ejected and can be locked on the outer shell.
Preferably, a return spring is mounted on a hollow shaft sleeve of the rail sliding body, the other end of the return spring is connected with the shifting fork brake arm, and when the shifting fork brake arm does not exert a tensile force, the return spring can drive the pulley to slide to the upper end of the sliding chute through the shifting fork brake arm.
Preferably, the shifting fork braking arms are installed in a hollow shaft sleeve of the rail sliding body, and the lower ends of the two shifting fork braking arms are connected through anti-loosening bolts and are connected with the safety belt through universal interlocking safety hooks.
Preferably, the width of the front surface of the outer shell is 55-60mm, and the height is 90-95 mm.
Preferably, the rotation shaft sleeve is further installed at the lower end of the arc-shaped bottom surface of the outer shell, the outer surface of the rotation shaft sleeve is higher than the arc-shaped bottom surface of the outer shell, and when the anti-falling protector slides on the guide steel wire rope, the rotation shaft sleeve can be driven to rotate.
The utility model also provides a vertical ladder climbing protection device, including connect perpendicularly on the derrick vertical ladder direction wire rope and the utility model discloses a prevent the protector that falls, direction wire rope wear adorn in prevent falling in the protector, direction wire rope's upper end is passed through U type ring and is connected in the vertical ladder upper end, direction wire rope's lower extreme passes through U type ring and basket of flowers bolted connection at the vertical ladder lower extreme.
The utility model has the advantages that: the utility model discloses, the structure is more reasonable, installs more conveniently, slides more smoothly, the more reliable advantage of locking function.
The utility model discloses preferred embodiment still includes following advantage:
firstly, when a worker slides up and down along the vertical rope, the shifting fork brake arm is pulled upwards, the shifting pulley retracts into the rail sliding body downwards along the inclined rail, and the shifting fork brake arm cannot extrude the guide steel wire rope. The smooth and easy non-jamming phenomenon in the up-and-down sliding is ensured. When the worker suddenly falls, the shifting fork brake arm is stressed instantly and tensioned downwards to drive the pulley to be extruded tightly on the guide steel wire rope, and the rotating shaft sleeve arranged at the lower end of the outer shell cambered surface rail enables the guide steel wire rope to be bent properly on the inner cambered surface of the outer shell, so that the function of enhancing resistance is achieved, and the falling prevention performance is more reliable.
Second, reset spring's installation can make the protector of preventing falling under natural state, and the pulley is located the spout upper end, can block on direction wire rope, is difficult to slide.
Thirdly, the width of the plane on one side of the outer shell reaches 57mm, and the height of the plane reaches 93 mm. And correspondingly widened the track sliding body of spiral-lock in the shell, the gravity acceleration when the staff falls suddenly probably makes traditional protector shell warp, and its rigidity and anti deformability have been strengthened greatly to this novel vertical ladder climbing protection device shell body, have obvious reliability.
Drawings
Fig. 1 is a front view of the fall protection device of this embodiment 1;
fig. 2 is a left side view of the fall protection device of this embodiment 1;
fig. 3 is a rear view of the fall protection device of this embodiment 1;
fig. 4 is a top view of the fall protection device of this embodiment 1;
FIG. 5 is a cross-sectional view taken along plane A-A of FIG. 4;
FIG. 6 is a schematic structural view of a rail slider according to embodiment 1;
FIG. 7 is a schematic structural view showing the outer case of this embodiment 1 in a state where the steel plates are flattened;
fig. 8 is a schematic structural view of the track plate in the embodiment 1;
FIG. 9 is a schematic view showing the construction of the pulley in the present embodiment 1;
fig. 10 is a schematic structural view of the elastic safety pin in the embodiment 1;
FIG. 11 is a schematic structural view of a 7-shaped bent rod in the present embodiment 1;
in the figure: 1. an outer housing; 11. a shaft sleeve mounting hole; 12. rotating the shaft sleeve; 13. an ear hole; 14. a U-shaped groove; 2. a track plate; 21. a chute; 22. a hollow shaft sleeve; 3. a shift fork brake arm; 4. a pulley; 41. a locking shaft; 5. an elastic safety pin shaft; 51. a marble; 52. a button; 6. a 7-shaped bent rod; 7. a lock bolt; 8. a rope; 9. a return spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1-4, the present embodiment provides a fall protection device, which includes an outer housing 1, a track sliding body, a fork braking arm 3, a "7" shaped bent rod 6, an elastic safety pin 5, etc.;
the outer shell 1 is pressed into a U-shaped structure by a steel plate, fig. 7 is a structural schematic diagram of the outer shell 1 in a steel plate flattening state, the bottom of the U-shaped structure is an arc-shaped slideway, and the arc-shaped track is a sliding track for guiding a steel wire rope; an L-shaped ear hole 13 is arranged at one side of the upper end of the opening of the outer shell 1, and a U-shaped groove 14 is arranged at the corresponding side.
As shown in fig. 6 and 8, the track sliding body is riveted by two track plates 2, sliding grooves 21 with the same direction are arranged at corresponding positions of the two track plates 2, the pulley 4 is arranged between the two track plates 2, the locking shafts 41 at two sides of the pulley 4 are positioned in the sliding grooves 21 at the corresponding positions, and the pulley 4 can move along the sliding grooves 21 through the locking shafts; the sliding groove 21 of the rail sliding body is designed into an oblique rail, and the stress principle during locking is met.
The shifting fork brake arm 3 is arranged in a hollow shaft sleeve 22 of the track sliding body, a bayonet at one end of the shifting fork brake arm 3 is inserted and meshed with a locking shaft 41 of a pulley 4 on the track sliding body, and the other end of the shifting fork brake arm is connected with a universal interlocking safety hook through a check bolt 7 and used for connecting a safety belt.
When the staff scrambleed the vertical ladder, received ascending pulling force, the shift fork brake arm 3 stirred pulley 4 and along the slant track downwards retract the track slide internal, like pulley 4 position in figure 6, the protector that falls can smoothly slide along direction wire rope, and the staff can smoothly scramble. When suddenly falling, the safety belt of the worker pulls the shifting fork brake arm 3 downwards, the shifting pulley 4 pushes the guide steel wire rope upwards along the inclined track, and the locking brake effect is achieved. The greater the force applied, the tighter the locking, as in the condition of the pulley 4 in fig. 5.
The shifting fork brake arm 3 is arranged on a hollow shaft sleeve 22 of the track sliding body, a bayonet at one end of the shifting fork brake arm 3 is inserted and meshed with a locking shaft 41 of a pulley 4 arranged on the track sliding body, and the other end of the shifting fork brake arm is connected with a universal interlocking safety hook through a check bolt 7 and used for connecting a safety belt.
The 7-shaped bent rod 6 is used for buckling and connecting the track sliding body and the outer shell 1. The straight end of a 7-shaped bent rod 6 is arranged in a hole in one side of the upper part of a track sliding body in a penetrating mode, a spring pin is arranged in the middle of the 7-shaped bent rod 6, the position of the spring pin is located between two track plates 2, when the 7-shaped bent rod moves left and right between the two track plates 2 to reach the position where the spring pin is arranged, the spring pin can block the 7-shaped bent rod to move continuously, the 7-shaped bent rod can only move left and right within a certain range, the bent part of the 7-shaped bent rod 6 penetrates into an ear hole 13 in one side of an outer shell 1, and a limiting pin is arranged at the end part of the bent rod, so that the bent rod cannot be separated from the ear hole 13 of the outer shell 1 and can move within a certain range.
After the track sliding body is buckled with the outer shell 1, the straight end of the 7-shaped bent rod 6 is clamped in the U-shaped groove 14 on the other side of the outer shell 1, and the end part of the 7-shaped bent rod is connected with the elastic safety pin shaft 5 through a rope lock. The spring plunger is arranged in the central hole of the elastic safety pin shaft 5, marbles 51 are arranged on two sides of the tail end of the elastic safety pin shaft 5, a spring plunger button 52 is pressed, the marbles 51 retract under the action of an internal spring and a push rod, the elastic safety pin shaft 5 can be smoothly inserted and pulled out, the button 52 is loosened, the marbles 51 on two sides of the tail end are popped out, and the shell 1 is reliably locked.
For convenience of use, the hollow shaft sleeve 22 of the rail sliding body is provided with a return spring 9, and when the rail sliding body is not stressed, the return spring 9 can enable the shifting fork brake arm 3 to drive the pulley 4 to automatically return to the position shown in the figure 5 on the rail sliding body.
In order to improve the security, axle sleeve 12 is rotated in the installation of shell body 1 cambered surface track lower extreme through axle sleeve mounting hole 11 to, rotating axle sleeve 12 surface is higher than the 1 interior cambered surface of shell body, and the staff normally scrambles and makes and rotate axle sleeve 12 and rotate, reduces sliding resistance, makes and slides more smoothly. When suddenly falling, because the inner arc surface of the outer shell 1 and the outer surface of the rotating shaft sleeve 12 are not on the same straight line, the pulley 4 is bent in a proper amount when extruding the guide steel wire rope, the function of enhancing the resistance is achieved, and the falling prevention performance is more reliable.
In order to improve the firmness of the anti-falling protector, the width of the front surface of the outer shell 1 is 55-60mm, in the embodiment, 57 mm; the height of the front surface of the outer shell 1 is 90-95mm, and in the embodiment, 93 mm. And correspondingly widened the track sliding body of spiral-lock in the casing, the gravity acceleration when the staff falls suddenly can make traditional protector shell warp, and its rigidity and anti deformability have been strengthened greatly to this novel vertical ladder climbing protection device shell body 1, and non-deformable has obvious reliability.
Example 2
This embodiment provides a vertical ladder climbing protection device, including the perpendicular direction wire rope of connecting on the derrick vertical ladder and embodiment 1's the protector that falls, direction wire rope wears to adorn in the protector that falls, and the U type ring is passed through to direction wire rope's upper end and connects in the vertical ladder upper end, and U type ring and basket of flowers bolted connection are passed through to direction wire rope's lower extreme at the vertical ladder lower extreme.
When in use, firstly, the guide steel wire rope is installed and fixed at the upper end and the lower end of the straight ladder; then the guide steel wire rope is arranged in the arc-shaped track of the outer shell 1 in a penetrating way, then the track sliding body is buckled with the outer shell 1, the button 52 of the elastic safety pin shaft 5 is pressed, and the elastic safety pin shaft 5 is arranged in the hollow shaft sleeve 22 of the outer shell 1 and the track sliding body in a penetrating way; when the button 52 is released, the marble 51 at the tail end of the elastic safety pin shaft 5 automatically pops up, and the elastic safety pin shaft 5 is locked on the outer shell 1 to form the vertical ladder climbing protection device with the linkage locking mechanism. The staff can climb from top to bottom with the safety belt connection on universal interlocking safety hook.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fall-preventing protector is characterized by comprising an outer shell (1), a track sliding body, a pulley (4) and a shifting fork brake arm (3);
the track sliding body is riveted by two track plates (2), sliding grooves (21) with the same direction are formed in the corresponding positions of the two track plates (2), the pulley (4) is arranged between the two track plates (2), locking shafts (41) on two sides of the pulley (4) are located in the sliding grooves (21) in the corresponding positions, and the pulley (4) can move along the sliding grooves (21) through the locking shafts;
the outer shell (1) is of a U-shaped structure, the track sliding body is installed inside the outer shell (1), a guide steel wire rope can be arranged between the arc-shaped bottom surface of the U-shaped structure and the pulley (4) in a penetrating mode, the sliding groove (21) is obliquely arranged on the track plate (2), when the pulley (4) is located at the upper end of the sliding groove (21), the guide steel wire rope can be matched with the outer shell (1) to compress the guide steel wire rope, and when the pulley (4) is located at the lower end of the sliding groove (21), the distance between the pulley (4) and the bottom surface of the outer shell (1) is larger than the diameter of the guide steel wire rope;
the shifting fork braking arms (3) are arranged between the outer shell (1) and the track sliding body, the number of the shifting fork braking arms (3) is two, the shifting fork braking arms are symmetrically arranged on the outer side of the track sliding body, and the middle of each shifting fork braking arm (3) is rotationally connected with the track sliding body; the upper ends of the two shifting fork brake arms (3) are respectively connected with the locking shafts (41) at corresponding positions; the lower ends of the two shifting fork brake arms (3) are mutually connected and can be detachably connected with a safety belt of a worker;
when the lower end of the shifting fork brake arm (3) is pulled upwards, the upper end of the shifting fork brake arm can drive the pulley (4) to slide to the lower end of the sliding groove (21), and the anti-falling protector can freely slide along the guide steel wire rope; when the lower end of the shifting fork brake arm (3) is pulled downwards, the shifting fork brake arm (3) can enable the pulley (4) to slide to the upper end of the sliding groove (21), so that the anti-falling protector is clamped on the guide steel wire rope.
2. Anti-fall protector according to claim 1, characterized in that the outer housing (1) is made of steel plate and is made into a U-shaped structure, the bottom of the U-shaped structure is an arc-shaped slideway, a part of the structure on one side with an opening at the upper end is bent downwards to form an L-shaped ear hole (13), and a U-shaped groove (14) is arranged on the corresponding position of the opposite side.
3. The anti-falling protector according to claim 2, characterized in that the track sliding body is connected with the outer shell (1) through a 7-shaped bent rod (6), the straight end of the 7-shaped bent rod (6) is arranged in a hole at the upper part of the track sliding body in a penetrating way, and a spring pin can be arranged at the middle part of the 7-shaped bent rod (6) and is positioned between two track plates (2); the elbow part of the 7-shaped bent rod (6) penetrates into an ear hole (13) on one side of the outer shell (1), and a limiting pin can be installed to prevent the elbow part from being separated from the ear hole (13); the straight end part of the 7-shaped bent rod (6) is clamped in the U-shaped groove (14).
4. Anti-fall protector according to claim 3 characterized in that the straight end of the 7-shaped bent rod (6) is further connected with a safety elastic pin (5) by a rope (8), the safety elastic pin (5) can be inserted in the concentric axes of the outer shell (1) and the rail slider.
5. The fall protection device according to claim 4, characterized in that a spring plunger is installed in the central hole of the elastic safety pin (5), a marble (51) is installed on the side surface of the tail end of the elastic safety pin (5), the marble (51) is connected with the spring plunger through a spring and a push rod, when a button (52) of the spring plunger is pressed, the marble (51) retracts into the elastic safety pin (5), and the elastic safety pin (5) can be smoothly inserted into or pulled out of the outer shell (1); when the button (52) is released, the marble (51) is ejected and can be locked on the outer shell (1).
6. Anti-fall protector according to claim 1, characterized in that a return spring (9) is mounted on the hollow sleeve (22) of the rail slider, the other end of the return spring (9) is connected to the fork brake arm (3), when the fork brake arm (3) is not under tension, the return spring (9) can drive the pulley (4) to slide to the upper end of the chute (21) through the fork brake arm (3).
7. Anti-fall protector according to claim 1, characterized in that the fork brake arms (3) are mounted in a hollow sleeve (22) of the rail slider, the lower ends of the two fork brake arms (3) being connected by a check bolt (7) and by a universal interlocking safety hook to a safety belt.
8. A fall protection device as claimed in claim 1, wherein the width of the front face of the outer housing (1) is 55-60mm and the height is 90-95 mm.
9. A fall protection device as claimed in claim 1, wherein a rotary sleeve (12) is further mounted at the lower end of the arc-shaped bottom surface of the outer housing (1), the outer surface of the rotary sleeve (12) is higher than the arc-shaped bottom surface of the outer housing (1), and the rotary sleeve (12) can be driven to rotate when the fall protection device slides on the guide wire rope.
10. A vertical ladder climbing protection device is characterized by comprising a guide steel wire rope vertically connected to a derrick vertical ladder and the anti-falling protector according to any one of claims 1 to 9, wherein the guide steel wire rope is arranged in the anti-falling protector in a penetrating mode, the upper end of the guide steel wire rope is connected to the upper end of the vertical ladder through a U-shaped ring, and the lower end of the guide steel wire rope is connected to the lower end of the vertical ladder through the U-shaped ring and a turnbuckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022682904.0U CN214912815U (en) | 2020-11-18 | 2020-11-18 | Anti-falling protector and vertical ladder climbing protection device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022682904.0U CN214912815U (en) | 2020-11-18 | 2020-11-18 | Anti-falling protector and vertical ladder climbing protection device with same |
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| Publication Number | Publication Date |
|---|---|
| CN214912815U true CN214912815U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022682904.0U Active CN214912815U (en) | 2020-11-18 | 2020-11-18 | Anti-falling protector and vertical ladder climbing protection device with same |
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| CN (1) | CN214912815U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115671600A (en) * | 2022-11-04 | 2023-02-03 | 贵州电网有限责任公司 | Use method of safety belt climbing main transformer for whole-course protection |
| CN115708936A (en) * | 2022-11-04 | 2023-02-24 | 贵州电网有限责任公司 | Hook structure of safety belt with mechanical double protection |
-
2020
- 2020-11-18 CN CN202022682904.0U patent/CN214912815U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115671600A (en) * | 2022-11-04 | 2023-02-03 | 贵州电网有限责任公司 | Use method of safety belt climbing main transformer for whole-course protection |
| CN115708936A (en) * | 2022-11-04 | 2023-02-24 | 贵州电网有限责任公司 | Hook structure of safety belt with mechanical double protection |
| CN115671600B (en) * | 2022-11-04 | 2023-09-15 | 贵州电网有限责任公司 | Use method of safety belt with whole-course protection of climbing main transformer |
| CN115708936B (en) * | 2022-11-04 | 2023-10-20 | 贵州电网有限责任公司 | Hook structure of safety belt with mechanical double protection |
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