CN113106844A - Adjustable spacing clearance's locking type prevents roof beam dog that falls - Google Patents
Adjustable spacing clearance's locking type prevents roof beam dog that falls Download PDFInfo
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- CN113106844A CN113106844A CN202110398402.1A CN202110398402A CN113106844A CN 113106844 A CN113106844 A CN 113106844A CN 202110398402 A CN202110398402 A CN 202110398402A CN 113106844 A CN113106844 A CN 113106844A
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- limiting
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- rod
- bolt
- steel plate
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention discloses a limit gap adjustable anti-loosening anti-falling beam stop block which comprises an embedded steel plate, wherein a bolt anti-loosening mechanism is arranged at the lower end of the embedded steel plate, and a gap adjusting mechanism is arranged at the lower end of the bolt anti-loosening mechanism. The anti-falling beam stop block has the advantages that the anti-falling beam stop block can be tightly attached to the anti-falling beam through the action of the gap adjusting mechanism, and can play a resistance effect at the first time if the anti-falling beam stop block is displaced, so that the sensitivity of the anti-falling beam stop block is improved; can carry out mechanical locking processing through bolt locking mechanism's effect to the bolt, avoid the bolt to drop, prevent that the roof beam dog that falls from becoming invalid.
Description
Technical Field
The invention relates to the technical field of application of anti-falling beam stop blocks, in particular to an anti-loosening anti-falling beam stop block capable of adjusting a limiting gap.
Background
After a box girder is erected in the railway bridge construction process, a beam falling prevention stop block needs to be installed, the aim is to prevent the box girder from moving transversely under the action of an earthquake force and improve the railway operation safety, the beam falling prevention stop block is divided into two parts, one part is embedded in the box girder and is installed when the box girder is poured, the other part is connected with the embedded part through bolts after the box girder is erected, and the transverse movement of the box girder can be prevented through the interference between the beam falling prevention stop block and the beam falling prevention stop block;
the existing anti-falling beam stop block is convenient to mount, a larger gap is formed between the anti-falling beam stop block and the anti-falling beam after the anti-falling beam stop block is mounted, and the size of the gap cannot be adjusted; the existing fastening bolt on the anti-falling beam stop block does not perform anti-loosening treatment, and the box beam has high-frequency and high-amplitude vibration, so that the bolt falls off for a long time, and the anti-falling beam stop block is invalid.
Disclosure of Invention
Aiming at the defects, the invention provides the anti-loose anti-falling beam stop block capable of adjusting the limit clearance, and solves the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a locking type anti-falling beam stop block capable of adjusting a limiting gap comprises an embedded steel plate, wherein a bolt locking mechanism is arranged at the lower end of the embedded steel plate, and a gap adjusting mechanism is arranged at the lower end of the bolt locking mechanism;
the clearance adjusting mechanism comprises a first circular through hole in the side surface of a pre-buried steel plate, round anchoring steel is installed on one side of the first circular through hole, bolt holes are formed in the lower end of the round anchoring steel, a rectangular steel plate is arranged on the lower surface of the pre-buried steel plate, fastening bolts are installed between the rectangular steel plate and the pre-buried steel plate and meshed with the bolt holes, I-shaped steel is installed on the lower surface of the rectangular steel plate, two circular through holes are formed in two sides of the I-shaped steel, two pairs of circular through holes are formed in the two pairs of circular through holes, pressure bearings are installed on one side of the I-shaped steel, rotating shafts are installed on inner rings of the pressure bearings, the rotating shafts penetrate through the two circular through holes, a threaded shaft is installed at one end of each rotating shaft, a; one end of the rotating shaft is provided with a worm wheel, the side surface of the I-shaped steel is provided with a limiting ring, the inner ring of the limiting ring is provided with a worm meshed with the worm wheel, the center of the worm is provided with a ratchet wheel, the side surface of the I-shaped steel is provided with a supporting rod, one end of the supporting rod is provided with a first pawl, and the first pawl is hinged with the supporting rod;
the bolt anti-loosening mechanism comprises support plates on two sides of an I-shaped steel, a limiting column is mounted at one end of each support plate, a sliding tube is mounted on one side of each limiting column, a limiting frame is mounted on the side surface of each sliding tube, a hollow column is mounted on the upper surface of each limiting frame, a circular hole is formed in the lower end of each hollow column, a sliding rod is mounted in the inner circle of the circular hole, a nut sleeve head is mounted at the upper end of each sliding rod, a compression spring I is mounted at the upper end of each sliding rod, a triangular groove is formed in the side surface of each sliding rod, an arc-shaped groove is formed in the side surface of each circular hole, a pawl II is mounted at one end of each arc-shaped groove and; the two ends of the limiting frame are provided with a first triangular limiting rod, the side surface of the threaded shaft is provided with an external threaded pipe, the side surface of the external threaded pipe is provided with a rectangular plate, the center of the rectangular plate is provided with a threaded hole meshed with the external threaded pipe, the upper surface of the rectangular plate is provided with a fixed shaft, the upper end of the fixed shaft is provided with a second triangular limiting rod, the second triangular limiting rod corresponds to the first triangular limiting rod in position, the second triangular limiting rod is hinged with the fixed shaft, the upper end of the fixed shaft is provided with a limiting plate, and a torsion spring is arranged between the second triangular limiting; and a horizontal plate is arranged on the side surface of the I-shaped steel, and a second compression spring is arranged between the horizontal plate and the limiting frame.
Furthermore, an annular groove is formed in the side surface of the anchoring round steel, and L-shaped deformed steel bars are mounted on the upper surface of the embedded steel plate.
Further, a rubber plate is arranged on the side surface of the pressure plate.
Further, a red label is mounted on a side surface of the slide bar.
Furthermore, a limiting groove is formed in the side surface of the spherical block, and a limiting strip is installed on the side surface of the spherical cover.
The invention has the beneficial effects that: the anti-falling beam stop block can be tightly attached to the anti-falling beam through the action of the gap adjusting mechanism, and can play a resistance effect at the first time if the anti-falling beam stop block is displaced, so that the sensitivity of the anti-falling beam stop block is improved; can carry out mechanical locking processing through bolt locking mechanism's effect to the bolt, avoid the bolt to drop, prevent that the roof beam dog that falls from becoming invalid.
Drawings
FIG. 1 is a schematic structural view of an anti-loose anti-drop beam stop block with adjustable limit clearance according to the invention;
FIG. 2 is a schematic view of an application scenario of an I-beam;
FIG. 3 is a schematic top view of the bolt loosening prevention mechanism;
FIG. 4 is a side view schematic illustration of an I-beam;
FIG. 5 is a partial schematic view of a bolt loosening prevention mechanism;
FIG. 6 is an enlarged schematic view of the bolt loosening prevention mechanism;
FIG. 7 is a partial schematic view of a gap adjustment mechanism;
FIG. 8 is an enlarged schematic view of the anchoring round bar;
FIG. 9 is a schematic view of a rectangular plate;
in the figure, 1, a steel plate is embedded; 2. a first circular through hole; 3. anchoring the round steel; 4. bolt holes; 5. a rectangular steel plate; 6. fastening a bolt; 7. i-shaped steel; 8. a second circular through hole; 9. a pressure bearing; 10. a rotating shaft; 11. a threaded shaft; 12. a threaded bushing; 13. a spherical block; 14. a spherical cover; 15. pressing a plate; 16. a worm gear; 17. a limiting ring; 18. a worm; 19. a ratchet wheel; 20. a support bar; 21. a first pawl; 22. a support plate; 23. a limiting column; 24. a sliding tube; 25. a limiting frame; 26. a hollow column; 27. a circular hole; 28. a slide bar; 29. sleeving a nut; 30. a first compression spring; 31. a triangular groove; 32. an arc-shaped slot; 33. a second pawl; 34. a spring plate; 35. an interference lever; 36. an extension spring; 37. a first triangular limiting rod; 38. an externally threaded tube; 39. a rectangular plate; 40. a threaded hole; 41. a fixed shaft; 42. a second triangular limiting rod; 43. a limiting plate; 44. a torsion spring; 45. a horizontal plate; 46. a second compression spring; 47. an annular groove; 48. l-shaped deformed steel bar; 49. a rubber plate; 50. a red label; 51. a limiting groove; 52. and (5) a limiting strip.
Detailed Description
The invention is described in detail with reference to the accompanying drawings, and as shown in fig. 1-9, the anti-loose type beam falling prevention stop block capable of adjusting the limit clearance comprises an embedded steel plate 1, wherein a bolt anti-loose mechanism is arranged at the lower end of the embedded steel plate 1, and a clearance adjusting mechanism is arranged at the lower end of the bolt anti-loose mechanism;
the clearance adjusting mechanism comprises a first circular through hole 2 on the side surface of an embedded steel plate 1, a round anchor bar 3 is arranged on one side of the first circular through hole 2, a bolt hole 4 is formed in the lower end of the round anchor bar 3, a rectangular steel plate 5 is arranged on the lower surface of the embedded steel plate 1, two fastening bolts 6 are arranged between the rectangular steel plate 5 and the embedded steel plate 1, the fastening bolts 6 are meshed with the bolt holes 4, an I-shaped steel 7 is arranged on the lower surface of the rectangular steel plate 5, two circular through holes 8 are formed in two sides of the I-shaped steel 7, two pairs of circular through holes 8 are arranged, a pressure bearing 9 is arranged on one side of the I-shaped steel 7, two pressure bearings 9 are arranged, a rotating shaft 10 is arranged on the inner ring of the pressure bearing 9, the rotating shaft 10 penetrates through the circular through holes two 8, a threaded shaft 11, a spherical cover 14 is arranged on the side surface of the spherical block 13, and a pressure plate 15 is arranged on the side surface of the spherical cover 14; a worm wheel 16 is installed at one end of the rotating shaft 10, a limiting ring 17 is installed on the side surface of the I-shaped steel 7, a worm 18 meshed with the worm wheel 16 is installed on the inner ring of the limiting ring 17, a ratchet wheel 19 is installed at the center of the worm 18, a supporting rod 20 is installed on the side surface of the I-shaped steel 7, a pawl I21 is installed at one end of the supporting rod 20, and the pawl I21 is hinged with the supporting rod 20; the ratchet wheel 19 rotates to drive the worm 18 to rotate through clockwise rotation of the ratchet wheel 19, the worm 18 can stably rotate under the action of the limiting ring 17, the worm 18 drives the worm wheel 16 and the rotating shaft 10 to rotate, the rotating shaft 10 directly drives the threaded shaft 11 to rotate, relative rotation occurs between the threaded shaft 11 and the threaded sleeve 12, the threaded shaft 11 drives the threaded sleeve 12, the spherical block 13, the spherical cover 14 and the pressing plate 15 to move towards one side of the anti-falling beam until the pressing plate 15 tightly supports the anti-falling beam, and a gap is formed between the anti-falling beam stop block and the anti-falling beam;
the bolt anti-loosening mechanism comprises support plates 22 on two sides of an I-shaped steel 7, a limiting column 23 is mounted at one end of each support plate 22, a sliding tube 24 is mounted at one side of each limiting column 23, a limiting frame 25 is mounted on the side surface of each sliding tube 24, a hollow column 26 is mounted on the upper surface of each limiting frame 25, a circular hole 27 is formed in the lower end of each hollow column 26, a sliding rod 28 is mounted at the inner ring of each circular hole 27, a nut sleeve head 29 is mounted at the upper end of each sliding rod 28, a compression spring I30 is mounted at the upper end of each sliding rod 28, a triangular groove 31 is formed in the side surface of each sliding rod 28, an arc-shaped groove 32 is formed in the side surface of each circular hole 27, a pawl II 33 is mounted at one end of each arc-shaped groove 32, each pawl II 33 is hinged to; two ends of the limit frame 25 are provided with a first triangular limit rod 37, the side surface of the threaded shaft 11 is provided with an external threaded pipe 38, the side surface of the external threaded pipe 38 is provided with a rectangular plate 39, the center of the rectangular plate 39 is provided with a threaded hole 40 which is mutually meshed with the external threaded pipe 38, the upper surface of the rectangular plate 39 is provided with a fixed shaft 41, the upper end of the fixed shaft 41 is provided with a second triangular limit rod 42, the second triangular limit rod 42 corresponds to the first triangular limit rod 37 in position, the second triangular limit rod 42 is hinged with the fixed shaft 41, the upper end of the fixed shaft 41 is provided with a limit plate 43, and a torsion spring 44 is arranged; a horizontal plate 45 is arranged on the side surface of the I-shaped steel 7, and a second compression spring 46 is arranged between the horizontal plate 45 and the limiting frame 25; the limit frame 25 can move upwards through the elasticity of the second compression spring 46, the limit frame 25 can stably slide under the action of the support plate 22, the limit column 23 and the sliding tube 24, and the nut sleeve head 29 is tightly attached to the fastening bolt 6 through the upward movement of the limit frame 25, so that the purpose of mechanical looseness prevention is achieved.
An annular groove 47 is formed in the side surface of the anchoring round steel 3, and an L-shaped deformed steel bar 48 is arranged on the upper surface of the embedded steel plate 1.
The pressure plate 15 has a rubber plate 49 mounted on a side surface thereof.
The slide bar 28 is provided with a red label 50 on a side surface thereof.
The side surface of the spherical block 13 is provided with a limiting groove 51, and the side surface of the spherical cover 14 is provided with a limiting strip 52.
In the embodiment, when the box girder is poured, the embedded steel plate 1 is embedded on the box girder, the embedded steel plate 1 can be anchored on the box girder through the action of the anchoring round steel 3 and the L-shaped deformed steel bar 48, the anchoring force of the anchoring round steel 3 can be improved through the action of the annular groove 47, as shown in fig. 2, the box girder is connected with a pier through a support, the support plays a role in bearing, the center of the upper surface of the pier is provided with the anti-falling girder, anti-falling girder stop blocks are installed on two sides of the anti-falling girder, and the anti-falling girder stop blocks are fixedly connected with the box girder; during installation, the I-shaped steel 7, the rectangular steel plate 5 and parts connected with the rectangular steel plate are moved to positions corresponding to the embedded steel plate 1 through an installation tool, and then fastening bolts 6 penetrate through the rectangular steel plate 5 and are meshed with the bolt holes 4, so that the rectangular steel plate 5 is attached to the embedded steel plate 1;
at the moment, the limit frame 25 is positioned at the lowest end, the second triangular limit rod 42 and the first triangular limit rod 37 are positioned at the position of interference, the second compression spring 46 is in a compressed state, the first pawl 21 and the ratchet wheel 19 are in a separated state, the ratchet wheel 19 is rotated clockwise by means of a rotating tool, the ratchet wheel 19 rotates to drive the worm 18 to rotate, the worm 18 can stably rotate under the action of the limiting ring 17, the worm 18 drives the worm wheel 16 and the rotating shaft 10 to rotate, the rotation of the rotating shaft 10 directly drives the threaded shaft 11 to rotate, the threaded shaft 11 and the threaded sleeve 12 relatively rotate, the threaded shaft 11 drives the threaded sleeve 12, the spherical block 13, the spherical cover 14 and the pressing plate 15 to move towards one side of the anti-falling beam until the pressing plate 15 tightly pushes the anti-falling beam, the threaded sleeve 12 and the spherical block 13 can be prevented from rotating along the rotation of the threaded shaft 11 through the action of the limiting groove 51 and the limiting strip 52; because the two spherical covers 14 arranged on the side surface of the pressure plate 15 are connected with the spherical blocks 13, the rotation of the threaded shaft 11 does not drive the pressure plate 15 to rotate;
through the meshing effect of the external thread pipe 38 and the threaded hole 40, the rotating shaft 10 can drive the rectangular plate 39 to move towards one side of the pressure bearing 9 when rotating, the rectangular plate 39 drives the fixed shaft 41 and the second triangular limit rod 42 to move, when the second triangular limit rod 42 is separated from the first triangular limit rod 37, the limit frame 25 can move upwards by utilizing the elastic force of the second compression spring 46, the limit frame 25 can stably slide through the functions of the support plate 22, the limit column 23 and the sliding pipe 24, the nut sleeve head 29 is tightly attached to the fastening bolt 6 by the upward movement of the limit frame 25, part of the hexagonal nut of the fastening bolt 6 is not completely attached to the hexagon of the nut sleeve head 29, the nut sleeve head 29 cannot be sleeved on the fastening bolt 6, the first compression spring 30 is in a compressed state, the red label 50 is exposed out of the hollow column 26 at the moment, the worker is reminded that the nut sleeve head 29 at the position is not, then, the sliding rod 28 is manually rotated along the pointer, the sliding rod 28 drives the nut sleeve head 29 to rotate until the nut sleeve head 29 is aligned with the fastening bolt 6, and at the moment, the nut sleeve head 29 can be sleeved on the fastening bolt 6 through the elastic force of the first compression spring 30, so that the purpose of mechanical looseness prevention is achieved; the sliding rod 28 can slide up and down under the action of the triangular groove 31 and the second pawl 33, the second pawl 33 can limit the sliding rod 28 to rotate only clockwise, and the counterclockwise rotation direction of the sliding rod 28 is the direction of unscrewing the fastening bolt 6;
when the limiting frame 25 moves upwards, one end of the first pawl 21 is pulled through the action of the extension spring 36, the other end of the first pawl 21 can be tightly attached to the ratchet wheel 19 by utilizing the lever principle, the ratchet wheel 19 is prevented from rotating anticlockwise, the elastic force of the second compression spring 46 does not need to be too large, and the height of the limiting frame 25 can be maintained; during later maintenance, the first pawl 21 can be manually lifted, the ratchet wheel 19 is rotated anticlockwise, the pressure plate 15 and the rectangular plate 39 are indirectly reset, the limiting frame 25 can be manually pressed down, the limiting frame 25 is located at the lowest position, the first triangular limiting rod 37 is pressed down to be in contact with the second triangular limiting rod 42, the second triangular limiting rod 42 is deviated anticlockwise and clockwise during contact, rigid contact between the first triangular limiting rod 37 and the second triangular limiting rod 42 is avoided, and resetting of the first triangular limiting rod 37 is facilitated through the shapes of the first triangular limiting rod 37 and the second triangular limiting rod 42; when the interference rod 35 moves downwards, one end of the first pawl 21 can be pressed, so that the other end of the first pawl 21 is tilted, and manual operation is facilitated.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (5)
1. The anti-loosening anti-falling beam stop block capable of adjusting the limiting gap comprises an embedded steel plate (1), and is characterized in that a bolt anti-loosening mechanism is arranged at the lower end of the embedded steel plate (1), and a gap adjusting mechanism is arranged at the lower end of the bolt anti-loosening mechanism;
the clearance adjusting mechanism comprises a first circular through hole (2) on the side surface of a pre-buried steel plate (1), an anchoring round steel (3) is installed on one side of the first circular through hole (2), a bolt hole (4) is formed in the lower end of the anchoring round steel (3), a rectangular steel plate (5) is arranged on the lower surface of the pre-buried steel plate (1), a fastening bolt (6) is installed between the rectangular steel plate (5) and the pre-buried steel plate (1), the fastening bolt (6) is meshed with the bolt hole (4), an I-shaped steel (7) is installed on the lower surface of the rectangular steel plate (5), a second circular through hole (8) is formed in each of two sides of the I-shaped steel (7), two pairs of circular through holes (8) are arranged, a pressure bearing (9) is installed on one side of the I-shaped steel (7), two pressure bearings (9) are arranged, an inner ring rotating shaft (10), one end of the threaded shaft (11) is provided with a threaded sleeve (12), the threaded sleeve (12) is hinged with the threaded shaft (11), one end of the threaded sleeve (12) is provided with a spherical block (13), the side surface of the spherical block (13) is provided with a spherical cover (14), and the side surface of the spherical cover (14) is provided with a pressing plate (15); a worm wheel (16) is installed at one end of the rotating shaft (10), a limiting ring (17) is installed on the side surface of the I-shaped steel (7), a worm (18) meshed with the worm wheel (16) is installed on the inner ring of the limiting ring (17), a ratchet wheel (19) is installed at the center of the worm (18), a supporting rod (20) is installed on the side surface of the I-shaped steel (7), a first pawl (21) is installed at one end of the supporting rod (20), and the first pawl (21) is hinged with the supporting rod (20);
the bolt anti-loosening mechanism comprises support plates (22) on two sides of an I-shaped steel (7), a limiting column (23) is installed at one end of each support plate (22), a sliding pipe (24) is installed on one side of each limiting column (23), a limiting frame (25) is installed on the side surface of each sliding pipe (24), a hollow column (26) is installed on the upper surface of each limiting frame (25), a round hole (27) is formed in the lower end of each hollow column (26), a sliding rod (28) is installed on the inner ring of each round hole (27), a nut sleeve head (29) is installed at the upper end of each sliding rod (28), a compression spring I (30) is installed at the upper end of each sliding rod (28), a triangular groove (31) is formed in the side surface of each sliding rod (28), an arc-shaped groove (32) is formed in the side surface of each round hole (27), a pawl II (33) is installed at one end of each arc-, an interference rod (35) is installed at the lower end of the hollow column (26), and an extension spring (36) is installed between the upper end of the interference rod (35) and the first pawl (21); the two ends of the limiting frame (25) are provided with a first triangular limiting rod (37), the side surface of the threaded shaft (11) is provided with an external threaded pipe (38), the side surface of the external threaded pipe (38) is provided with a rectangular plate (39), the center of the rectangular plate (39) is provided with a threaded hole (40) which is meshed with the external threaded pipe (38), the upper surface of the rectangular plate (39) is provided with a fixed shaft (41), the upper end of the fixed shaft (41) is provided with a second triangular limiting rod (42), the second triangular limiting rod (42) corresponds to the first triangular limiting rod (37), the second triangular limiting rod (42) is hinged with the fixed shaft (41), the upper end of the fixed shaft (41) is provided with a limiting plate (43), and a torsion spring (44) is arranged between the second triangular limiting rod (42); horizontal plates (45) are installed on the side surfaces of the I-shaped steel (7), and second compression springs (46) are installed between the horizontal plates (45) and the limiting frames (25).
2. The anti-loose anti-falling beam stop block with the adjustable limit gap is characterized in that an annular groove (47) is formed in the side surface of the anchoring round steel (3), and an L-shaped threaded steel (48) is installed on the upper surface of the embedded steel plate (1).
3. The check type falling preventive stopper of an adjustable limit gap according to claim 1, wherein a rubber plate (49) is installed at a side surface of the pressing plate (15).
4. The check type falling preventive stopper of an adjustable limit gap according to claim 1, wherein a red label (50) is installed on a side surface of the sliding rod (28).
5. The anti-loose type beam falling prevention stop block with the adjustable limit gap as claimed in claim 1, wherein a limit groove (51) is formed on the side surface of the spherical block (13), and a limit strip (52) is installed on the side surface of the spherical cover (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110398402.1A CN113106844B (en) | 2021-04-14 | 2021-04-14 | Adjustable spacing clearance's locking type prevents roof beam dog that falls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110398402.1A CN113106844B (en) | 2021-04-14 | 2021-04-14 | Adjustable spacing clearance's locking type prevents roof beam dog that falls |
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| Publication Number | Publication Date |
|---|---|
| CN113106844A true CN113106844A (en) | 2021-07-13 |
| CN113106844B CN113106844B (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110398402.1A Active CN113106844B (en) | 2021-04-14 | 2021-04-14 | Adjustable spacing clearance's locking type prevents roof beam dog that falls |
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