CN117145297B - Building engineering security fence - Google Patents

Building engineering security fence Download PDF

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Publication number
CN117145297B
CN117145297B CN202311412555.2A CN202311412555A CN117145297B CN 117145297 B CN117145297 B CN 117145297B CN 202311412555 A CN202311412555 A CN 202311412555A CN 117145297 B CN117145297 B CN 117145297B
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China
Prior art keywords
coaming
base
hole
transmission
wall
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Application number
CN202311412555.2A
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Chinese (zh)
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CN117145297A (en
Inventor
张璐
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Zibo Vocational Institute
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Zibo Vocational Institute
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Priority to CN202311412555.2A priority Critical patent/CN117145297B/en
Publication of CN117145297A publication Critical patent/CN117145297A/en
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Publication of CN117145297B publication Critical patent/CN117145297B/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00Fencing, e.g. fences, enclosures, corrals
    • E04H17/14Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
    • E04H17/16Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00Fencing, e.g. fences, enclosures, corrals
    • E04H17/14Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
    • E04H17/20Posts therefor
    • E04H17/22Anchoring means therefor, e.g. specially-shaped parts entering the ground; Struts or the like
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Catching Or Destruction (AREA)

Abstract

The invention discloses a building engineering safety fence, which comprises a base, wherein a first coaming is hinged to the top of the base, a second coaming is hinged to the top of the first coaming, the cross sections of the first coaming and the second coaming and the base form a snake shape when the first coaming and the second coaming are close to the base, a rotary driving table is arranged at the top of the base, a vertically distributed screw rod is detachably connected to the top of the rotary driving table, a transmission sleeve matched with the screw rod in a screwing mode is connected to the second coaming in a rotating mode, and a locking piece matched with the rotary driving table is arranged on the outer wall of the transmission sleeve. According to the invention, the first coaming, the second coaming, the screw rod, the rotary driving table and the protective cotton cloth are arranged, so that the fence has the advantages of high installation efficiency, labor saving, convenient folding and transferring, vibration resistance, sound insulation, noise reduction and wind and rain impact prevention.

Description

Building engineering security fence
Technical Field
The invention relates to the technical field of building construction, in particular to a building engineering safety fence.
Background
In the construction process of the building engineering, in order to reduce the influence on the surrounding, prevent the incident caused by the non-staff entering the construction site, avoid the pedestrian to receive the influence of the construction phenomenon at the same time, generally need to set up the security fence to isolate and warn the non-staff, thus achieve the goal of eliminating, relieving the potential safety hazard.
At present, a common safety fence is generally in a vertical plate-shaped structure, a base connected with the ground through expansion bolts is arranged at the bottom of the common safety fence, and a construction area is isolated from the outside (pedestrians, vehicles and the like) through the plate-shaped structure. However, the prior plate-shaped fence has the following defects: 1. the fence is divided into an integral structure and a split structure, wherein the integral structure can be safely installed by a plurality of persons in the process of installing the fence on the ground, the split structure is generally provided with a base firstly, then the vertical part is in butt joint with the base, and a large number of bolts are used for connecting the vertical part and the base, so that the problem of low installation efficiency exists in the two fences; 2. when the split fence is not used, the split fence needs to be disassembled, accessories are easy to disperse and lose after the split fence is disassembled, and the dispersed parts are inconvenient to fix, so that the defect of inconvenient transfer exists; 3. the vibration-resistant noise-reducing function is lacking, that is, vibration can be generated in the construction process and transmitted to the fence through the ground, and a large amount of noise can be generated by the vibration of the fence to form noise pollution; 4. the effect of resisting wind and rain is poor, and in the case of heavy wind and rain, the pressure between the fence and the wind and rain is high, so that the situation of collapse is easy to occur; 5. noise insulation and noise reduction effect are poor, noise generated in a construction area easily penetrates through the fence and is transmitted to the outside, and impact stone generated by using the fence can impact the fence to form impact noise.
To this end, the invention provides a construction safety fence.
Disclosure of Invention
The invention aims at: in order to solve the problems mentioned in the background art, a construction engineering safety fence is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a building engineering security fence, includes the base, the top of base articulates and is connected with first bounding wall, the top of first bounding wall articulates and is connected with the second bounding wall, its cross section with the base constitutes snakelike when first bounding wall and second bounding wall are close to the base, the top of base is provided with rotary drive platform, and the lead screw that is connected with vertical distribution can be dismantled at the top of this rotary drive platform, rotate on the second bounding wall and be connected with and screw spin closes complex driving sleeve, the outer wall of driving sleeve is provided with the retaining member that uses with rotary drive platform cooperation.
As a further description of the above technical solution:
the face of second bounding wall has been seted up and has been close to the hole of stepping down of the upper rectangle in the middle part, and the connecting hole has been seted up to the downthehole both sides of this upper rectangle of stepping down, the both sides fixedly connected with of drive sleeve rotate the connecting axle of being connected with the connecting hole, set up the lower rectangle of being located the hole below of stepping down of upper rectangle on the face of first bounding wall and step down the hole.
As a further description of the above technical solution:
the rotary driving table comprises a pile pipe and a transmission shaft, the bottom of the pile pipe is fixedly connected with the top wall of the base, the bottom of the transmission shaft is sleeved at the top of the pile pipe and is in rotary connection, and a guide hole which is in axial sliding fit with the top of the transmission shaft and is in plug connection is formed in the bottom of the screw rod.
As a further description of the above technical solution:
the bottom of the transmission sleeve is provided with a limit hole in clearance fit with the pile pipe, the locking piece is a screw, one end of the screw is in penetration and screwing fit with the outer wall of the transmission sleeve, and the outer wall of the pile pipe is provided with a clamping groove matched and adapted to one end of the screw.
As a further description of the above technical solution:
the guide hole is internally provided with a damping spring, the top of the screw rod is provided with a regulating hole communicated with the guide hole, a regulating disc close to the top is rotationally connected in the regulating hole, and the bottom of the regulating disc is fixedly connected with a transmission rod connected with the top of the damping spring.
As a further description of the above technical solution:
a plurality of buffer air channels positioned on two sides of the lower rectangular abdication hole are formed in the plate surface of the first coaming.
As a further description of the above technical solution:
the rotary driving table comprises a driving shaft, a driving gear and a transmission gear, the peripheral wall of the pile pipe is fixedly connected with a gear box, the driving shaft is arranged to penetrate through the gear box and is fixedly sleeved with the driving gear which is positioned in the gear box, and the transmission gear which is meshed with the driving gear is fixedly sleeved on the transmission shaft.
As a further description of the above technical solution:
one end of the first coaming, which is far away from the second coaming, is fixedly connected with a first row of hooks, one end of the second coaming, which is hinged with the base, is fixedly connected with a second row of hooks, and protective cotton cloth is hung between the first hooks and the second hooks.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the invention, the first coaming and the second coaming with the up-down folding function are arranged on the base, so that the installation efficiency of the fence and the ground is greatly improved, and the rotary driving table and the screw rod driven to rotate by the rotary driving table are arranged on the base, so that the first coaming and the second coaming can be driven to be unfolded into a fence shape when the screw rod rotates, and the integral installation efficiency of the fence is greatly improved;
2. according to the invention, through arranging the pile tube, the driving shaft, the transmission shaft, the driving gear and the transmission gear, the rotation control operation of the screw rod is more labor-saving and convenient, and the invention has the advantage of greatly reducing the labor intensity of rail installation;
3. according to the invention, the screw rod and the transmission shaft are arranged to be in a detachable connection structure, and then the locking piece is arranged between the transmission sleeve and the pile pipe, so that the fence has the advantages of reducing occupied space after being folded, being in an integral locking state and being convenient for integral transfer;
4. according to the invention, the damping spring is arranged between the transmission shaft and the screw rod, so that the fence has the advantages of shock resistance and noise reduction;
5. according to the invention, the first fence is provided with the plurality of buffer air channels, so that the fence has the advantage of weather resistance;
6. according to the invention, the protective cotton cloth is hung between the unfolded first coaming and the second coaming, so that the fence has the advantages of sound insulation, noise reduction and stone impact buffering.
Drawings
Fig. 1 is a schematic structural view of a constructional engineering safety fence provided by the invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic structural view of an upper rectangular yielding hole, an upper rectangular yielding hole and a buffer air duct of a constructional engineering safety fence provided by the invention;
fig. 4 is a schematic structural view of a folded construction safety fence according to the present invention;
fig. 5 is a schematic structural diagram of a rotary driving table, a screw rod, a damping spring and an adjusting disc of the safety fence for construction engineering after explosion deployment;
FIG. 6 is a schematic view of the bottom view of FIG. 5;
fig. 7 is a schematic plan view of the installation of protective cotton cloth of a construction safety fence according to the present invention.
Legend description:
1. a base; 2. a first coaming; 21. a lower rectangular abdication hole; 22. a buffer air duct; 23. a first bending hook is arranged; 3. a second coaming; 31. a rectangular abdication hole is arranged; 32. a second bending hook; 4. protective cotton cloth; 5. a rotary driving table; 51. a pile pipe; 511. a clamping groove; 512. a gear box; 52. a transmission shaft; 53. a drive shaft; 54. a drive gear; 55. a transmission gear; 6. a screw rod; 61. a guide hole; 62. an adjustment aperture; 7. a transmission sleeve; 71. a connecting shaft; 72. a limiting hole; 8. a locking member; 9. an adjusting plate; 91. a transmission rod; 101. and a damping spring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1 to 6, a construction safety fence includes a base 1, and when installed, the base 1 is connected with the ground through expansion bolts. The top of base 1 is articulated to be connected with first bounding wall 2, and the top of first bounding wall 2 is articulated to be connected with second bounding wall 3, and its cross section with base 1 constitutes snakelike when first bounding wall 2 and second bounding wall 3 are close to base 1, and first bounding wall 2 and second bounding wall 3 constitute rail structure, and above-mentioned hinge structure makes this rail have to rise to expand and descend folding function, makes things convenient for base 1 and ground to connect.
The top of base 1 is provided with rotary drive platform 5, the lead screw 6 of vertical distribution is dismantled at the top of this rotary drive platform 5, rotary drive platform 5's effect is the driving force that provides the rotation to lead screw 6, and specifically, rotary drive platform 5 includes stake pipe 51 and transmission shaft 52, the roof fixed connection of stake pipe 51 bottom and base 1, the top at stake pipe 51 is established to the bottom cover of transmission shaft 52 and is rotated and is connected, the guiding hole 61 that just is plug connection with the top axial sliding fit of transmission shaft 52 has been seted up to the bottom of lead screw 6, can set up the guide block at the fixed inner wall of guiding hole 61, then set up with guide block complex guide way at the outer wall of transmission shaft 52. The rotary driving table 5 comprises a driving shaft 53, a driving gear 54 and a transmission gear 55, the peripheral wall of the pile tube 51 is fixedly connected with a gear box 512, the driving shaft 53 is arranged to penetrate through the gear box 512 and is fixedly sleeved with the driving gear 54 positioned in the gear box 512, the transmission gear 55 meshed with the driving gear 54 is fixedly sleeved on the transmission shaft 52, when the driving shaft 53 is controlled to rotate, the transmission shaft 52 rotates under the meshing cooperation of the driving gear 54 and the transmission gear 55, and the driving shaft 53 can be welded with a hexagonal driving head at the top of the driving shaft 53, then the sleeve on the hand-held trigger is used for butt joint with the hexagonal driving head, and the hand-held trigger can be started to drive the driving shaft 53 to rotate. This arrangement has the advantage of controlling the rotation of the screw 6 to be more labour-saving.
The second coaming 3 is rotationally connected with a transmission sleeve 7 which is rotationally matched with the lead screw 6, specifically, an upper rectangular yielding hole 31 close to the middle is formed in the surface of the second coaming 3, connecting holes are formed in two sides in the upper rectangular yielding hole 31, connecting shafts 71 rotationally connected with the connecting holes are fixedly connected to two sides of the transmission sleeve 7, a lower rectangular yielding hole 21 positioned below the upper rectangular yielding hole 31 is formed in the surface of the first coaming 2, and the upper rectangular yielding hole 31 and the lower rectangular yielding hole 21 are yielding through holes of the lead screw 6.
Therefore, when the screw rod 6 rotates, the first coaming plate 2 and the second coaming plate 3 are driven to move up and down through the transmission sleeve 7, and the unfolding and folding control of the fence is realized. Wherein, after the rail is folded, lead screw 6 can be taken off, does not occupy the space, conveniently deposits.
The outer wall of the transmission sleeve 7 is provided with a locking piece 8 matched with the rotary driving table 5, and the locking piece 8 is used for locking the folded fence to prevent the deformation of the folded fence, so that the folding fence has the advantage of convenience in transportation. Specifically, a limiting hole 72 in clearance fit with the pile tube 51 is formed in the bottom of the driving sleeve 7, that is, when the driving sleeve 7 moves to the bottom, the limiting hole 72 is sleeved outside the pile tube 51. The retaining member 8 is a screw, one end of the screw is in through-rotation fit with the outer wall of the transmission sleeve 7, a clamping groove 511 matched with one end of the screw is formed in the outer wall of the pile tube 51, and when the screw is screwed, one end of the screw is inserted into the clamping groove 511, so that the pile tube 51 and the transmission sleeve 7 are locked.
Example 2: referring to fig. 5 and 6, the difference from embodiment 1 is that the damping spring 101 is disposed in the guide hole 61, and the damping spring 101 makes the rail have an up-down damping function, and the damping function can effectively reduce noise generated by construction vibration of the rail. The top of lead screw 6 has offered the regulation hole 62 of intercommunication guiding hole 61, and this regulation hole 62 internal rotation is connected with the regulating plate 9 that is close to the top, and the bottom fixedly connected with bottom of regulating plate 9 and the transfer line 91 of damping spring 101 top connection, and the size of just can adjusting the shock attenuation degree of control regulating plate 9 rotation, wherein can weld a handle at the top of regulating plate 9, make things convenient for manual control regulating plate 9 rotation.
In this embodiment, offer a plurality of buffering wind channel 22 that are located the hole 21 both sides of stepping down of rectangle on the face of first bounding wall 2, buffering wind channel 22 is the place that the air current circulates, and when external air current impacted the rail, the air current was down and then was flowed through buffering wind channel 22 under the direction of first bounding wall 2, and this kind of setting makes this rail have the advantage that is fit for the weather of heavy weather and uses.
Example 3: referring to fig. 7, the difference between the embodiment 1 and the embodiment 2 is that a row of hooks 23 are fixedly connected to one end of the first coaming 2 away from the second coaming 3, a row of hooks 32 are fixedly connected to one end of the second coaming 3 away from the first coaming 2, a protective cotton cloth 4 is hung between the hooks 23 and the hooks 32, and the protective cotton cloth 4 is regenerated soundproof cotton cloth, which is used for sound insulation and protection, wherein the protection can effectively prevent stone impact fence generated by construction.
Working principle:
1. and (2) mounting: installing expansion bolts on the ground, placing a base 1 (the base 1 is rectangular and provided with connecting holes close to corners) at the bottom of the rail in a folded state above the expansion bolts, and locking the expansion bolts;
2. and (3) unfolding: then the bottom of the screw rod 6 is manually screwed and butted with the top of the transmission sleeve 7, the locking piece 8 is manually unscrewed, the limit on the transmission sleeve 7 is released, the screw rod 6 is continuously rotated, the guide hole 61 at the bottom of the screw rod 6 is sleeved on the transmission shaft 52, then the manual trigger is used for driving the driving shaft 53 to rotate, the driving gear 54 is used for driving the transmission gear 55 to rotate, the transmission shaft 52 drives the screw rod 6 to rotate, at the moment, the transmission sleeve 7 drives the second coaming 3 to move upwards, the second coaming 3 can drive the first coaming 2 to move upwards, when the second coaming 3 rises to the limit position, one end of the upper rectangular yielding hole 31 is abutted against the screw rod 6, at the moment, the whole fence is in a fastening state, and an opening surrounded by the first coaming 2 and the second coaming 3 faces a construction area;
three-guard installation: the top of the protective cotton cloth 4 is connected with the first bending hook 23 in a hanging mode, the bottom of the protective cotton cloth 4 is connected with the second bending hook 32 in a hanging mode, at the moment, the whole protective cotton cloth 4 plays roles of isolation, buffering and sound insulation, and the first coaming 2 and the second coaming 3 play roles in supporting and protecting.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (4)

1. The utility model provides a building engineering security fence, includes base (1), its characterized in that, the top of base (1) articulates and is connected with first bounding wall (2), the top of first bounding wall (2) articulates and is connected with second bounding wall (3), its cross section with base (1) constitutes snakelike when first bounding wall (2) and second bounding wall (3) are close to base (1), the top of base (1) is provided with rotary drive platform (5), and lead screw (6) that vertical distribution can be dismantled at the top of this rotary drive platform (5), rotate on second bounding wall (3) and be connected with on the second bounding wall and screw (6) the transmission cover (7) of spin-fit, the outer wall of transmission cover (7) is provided with latch (8) that use with rotary drive platform (5) cooperation;
an upper rectangular abdicating hole (31) close to the middle is formed in the plate surface of the second coaming (3), connecting holes are formed in two sides in the upper rectangular abdicating hole (31), connecting shafts (71) rotationally connected with the connecting holes are fixedly connected to two sides of the transmission sleeve (7), and a lower rectangular abdicating hole (21) positioned below the upper rectangular abdicating hole (31) is formed in the plate surface of the first coaming (2);
the rotary driving table (5) comprises a pile tube (51) and a transmission shaft (52), the bottom of the pile tube (51) is fixedly connected with the top wall of the base (1), the bottom of the transmission shaft (52) is sleeved on the top of the pile tube (51) and is in rotary connection, and a guide hole (61) which is axially and slidably matched with the top of the transmission shaft (52) and is in plug connection is formed in the bottom of the screw rod (6);
the bottom of the transmission sleeve (7) is provided with a limit hole (72) in clearance fit with the pile tube (51), the locking piece (8) is a screw, one end of the screw is in through screwing fit with the outer wall of the transmission sleeve (7), and the outer wall of the pile tube (51) is provided with a clamping groove (511) matched and adapted to one end of the screw;
a damping spring (101) is arranged in the guide hole (61), an adjusting hole (62) communicated with the guide hole (61) is formed in the top of the screw rod (6), an adjusting disc (9) close to the top is rotatably connected in the adjusting hole (62), and a transmission rod (91) connected with the bottom of the adjusting disc (9) and the top of the damping spring (101) is fixedly connected to the bottom of the adjusting disc.
2. The construction safety fence according to claim 1, wherein a plurality of buffer air channels (22) positioned at two sides of the lower rectangular abdication hole (21) are formed on the surface of the first coaming (2).
3. The construction safety fence according to claim 1, characterized in that the rotary driving table (5) comprises a driving shaft (53), a driving gear (54) and a transmission gear (55), the outer peripheral wall of the pile tube (51) is fixedly connected with a gear box (512), the driving shaft (53) is arranged to penetrate through the gear box (512) and is fixedly sleeved with the driving gear (54) located in the gear box (512), and the transmission gear (55) meshed with the driving gear (54) is fixedly sleeved on the driving shaft (52).
4. A constructional engineering safety fence according to any one of claims 1-3, wherein a row of hooks (23) are fixedly connected to one end, away from the second coaming (3), of the first coaming (2), a row of hooks (32) are fixedly connected to one end, away from the first coaming (2), of the second coaming (3), and protective cotton cloth (4) is hung between the hooks (23) and the hooks (32).
CN202311412555.2A 2023-10-30 2023-10-30 Building engineering security fence Active CN117145297B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311412555.2A CN117145297B (en) 2023-10-30 2023-10-30 Building engineering security fence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311412555.2A CN117145297B (en) 2023-10-30 2023-10-30 Building engineering security fence

Publications (2)

Publication Number Publication Date
CN117145297A CN117145297A (en) 2023-12-01
CN117145297B true CN117145297B (en) 2024-01-02

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101536956B1 (en) * 2015-02-13 2015-07-16 (주)플랜에이건축사사무소 Height adjustable balustrade for apartment house
CN205840516U (en) * 2016-07-15 2016-12-28 江苏工程职业技术学院 A kind of construction guardrail
CN207569133U (en) * 2017-12-11 2018-07-03 天津职业技术师范大学 A kind of automobile shock-absorber
CN218092443U (en) * 2022-10-08 2022-12-20 济南瑞质机械有限公司 Accomodate convenient folding flexible guardrail

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101536956B1 (en) * 2015-02-13 2015-07-16 (주)플랜에이건축사사무소 Height adjustable balustrade for apartment house
CN205840516U (en) * 2016-07-15 2016-12-28 江苏工程职业技术学院 A kind of construction guardrail
CN207569133U (en) * 2017-12-11 2018-07-03 天津职业技术师范大学 A kind of automobile shock-absorber
CN218092443U (en) * 2022-10-08 2022-12-20 济南瑞质机械有限公司 Accomodate convenient folding flexible guardrail

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