CN110924699A - Safe anti-falling device for constructional engineering construction - Google Patents
Safe anti-falling device for constructional engineering construction Download PDFInfo
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- CN110924699A CN110924699A CN201911220955.7A CN201911220955A CN110924699A CN 110924699 A CN110924699 A CN 110924699A CN 201911220955 A CN201911220955 A CN 201911220955A CN 110924699 A CN110924699 A CN 110924699A
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- elastic plate
- plate
- fixation clamp
- building engineering
- adjusting mechanism
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
- E04G21/3223—Means supported by building floors or flat roofs, e.g. safety railings
- E04G21/3233—Means supported by building floors or flat roofs, e.g. safety railings without permanent provision in the floor or roof
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a safety anti-falling device for construction of constructional engineering, which belongs to the technical field of constructional engineering and comprises an elastic plate and a protective net connected to the periphery of the top of the elastic plate. The elastic plate comprises an upper elastic plate, a lower elastic plate and a height adjusting mechanism, and the height adjusting mechanism is connected to the bottom of the lower elastic plate. The invention can adjust the height of the lower elastic plate by controlling the operation of the double-shaft motor. Through set up buffer gear between last elastic plate and lower elastic plate, improve the cushioning effect of this device, promote the security performance. Through the fixture of installation in high adjusting device's both sides, realize effective fixed between this device and the outside construction equipment, facilitate the use. The safe anti-falling device is reasonable in structure, simple to operate, high in use flexibility, strong in practicability and wide in application range, effectively improves the construction safety of constructional engineering, is an advanced green building construction technology, and effectively improves the technical level of the green building construction technology.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a safe anti-falling device for constructional engineering construction.
Background
In the building engineering work progress, constructor mostly need stand highly and construct, has very big safety threat, the condition that falls appears owing to the accident easily. Most of existing anti-falling safety protection devices are provided with a protective net below, but the strength of the protective net has certain limitation, so that the situation that the protective net is damaged due to too large impact is very easy to happen, and the protective performance is poor. And the height of the guard cannot be adjusted according to the height of the building. In addition, when encountering that constructor falls, because do not have shock-absorbing structure, constructor often can receive serious injury.
Disclosure of Invention
The invention aims to provide a safe anti-falling device for construction of constructional engineering, which aims to solve the problem that the strength of a protective net is limited, and the protective net is easily damaged due to overlarge impact; the height of the protection device cannot be adjusted according to the height of the building; without a damping structure, constructors are often seriously injured.
In order to solve the technical problem, the invention provides a safe anti-falling device for building engineering construction, which comprises an elastic plate and a protective net connected to the periphery of the top of the elastic plate, wherein the elastic plate comprises an upper elastic plate, a lower elastic plate and a height adjusting mechanism, and the height adjusting mechanism is connected to the bottom of the lower elastic plate.
Preferably, the height adjustment mechanism includes:
the top of the bottom plate is provided with a sliding chute;
the double-shaft motor is arranged at the bottom of the sliding groove, two output shafts of the double-shaft motor are respectively connected with screw rods with opposite thread directions, and the other ends of the screw rods are connected with the side wall of the bottom plate;
the screw rod sleeve is connected to the outside of the screw rod in a matching way and can move left and right relative to the screw rod;
the sliding block is connected to the bottom of the screw rod sleeve and can slide along the sliding groove;
the bottom end of the movable rod is connected to the top of the screw rod sleeve, and the top end of the movable rod is connected to the bottom of the lower elastic plate.
Preferably, the bottom of the bottom plate is provided with a roller.
Preferably, the damping mechanism is connected between the upper elastic plate and the lower elastic plate.
Preferably, buffer gear includes spring and gasbag, spring coupling is between the bight of last elastic plate and the bight of lower elastic plate, the axis of gasbag and the axis coincidence of the axis of last elastic plate, lower elastic plate, be provided with the air inlet on the gasbag.
Preferably, the cushioning mechanism further comprises a retraction assembly disposed between the bladder and the spring, the retraction assembly comprising:
the connecting plates comprise an upper connecting plate and a lower connecting plate which are arranged in pairs, and the connecting plates are respectively connected to the bottom of the upper elastic plate and the top of the lower elastic plate;
the lifting frame is connected between the upper connecting plate and the lower connecting plate;
and the elastic piece is connected between the upper connecting plate and the lower connecting plate.
Preferably, height adjusting mechanism's both sides are equipped with fixture, fixture includes first fixation clamp and the second fixation clamp of articulated connection, first fixation clamp and second fixation clamp are the X setting that appears, the one end fixed connection of first fixation clamp is at height adjusting mechanism's lateral wall, the one end swing joint of second fixation clamp is at height adjusting mechanism's lateral wall and can slide along height adjusting mechanism's lateral wall.
Preferably, a movable groove is formed in the side wall of the height adjusting mechanism, one end, connected with the height adjusting mechanism, of the second fixing clamp is connected with a movable block, and the movable block can slide along the movable groove so as to drive the second fixing clamp to slide along the side wall of the height adjusting mechanism.
Preferably, be connected with adjusting part between first fixation clamp and the second fixation clamp, adjusting part sets up between the hinge point and the height adjusting mechanism of first fixation clamp and second fixation clamp, adjusting part includes fly leaf and electric putter, the fly leaf sets up in pairs and is connected with first fixation clamp and second fixation clamp are articulated respectively, electric putter connects between the fly leaf.
Preferably, the lateral wall of bottom plate is equipped with control switch, control switch and biax motor and electric putter all electric connection.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) according to the safety anti-falling device, the height adjusting mechanism is arranged at the bottom of the lower elastic plate, when the double-shaft motor works, the lead screws at two ends are driven to rotate, then the lead screw sleeves drive the sliding blocks to slide in the sliding grooves, and meanwhile, the movable rods are driven to move up and down, so that the height of the lower elastic plate is adjusted, and the height of the whole safety anti-falling device is adjusted.
(2) According to the safety anti-falling device, the buffer mechanism is arranged between the lower elastic plate and the upper elastic plate, the elasticity of the elastic part in the telescopic assembly and the up-and-down movement of the lifting frame are utilized, and the spring and the air bag are matched, so that the relieving and buffering effects are improved, and the larger damage is avoided.
(3) The clamping mechanism is further arranged on the side wall of the height adjusting mechanism of the safety anti-falling device, and when the electric push rod works, the second fixing clamp can be driven to be close to or far away from the first fixing clamp, so that the safety anti-falling device is fixed with external construction equipment, and the safety anti-falling device is convenient to use.
(4) The roller is arranged at the bottom of the height adjusting mechanism of the safety anti-falling device, so that the whole safety anti-falling device can be conveniently moved to different using places. The safe anti-falling device is reasonable in structure, simple to operate, high in use flexibility, strong in practicability and wide in application range.
Drawings
FIG. 1 is a schematic view of a front sectional structure of the safety catch device.
Fig. 2 is a schematic view of the connection between the protective net and the upper elastic plate.
Fig. 3 is a schematic structural view of the telescopic assembly.
FIG. 4 is a schematic top view of the connection between the clamping mechanism and the base plate.
Fig. 5 is a schematic structural view of the adjustment assembly.
The attached drawings are marked as follows: 1-elastic plate, 101-upper elastic plate, 102-lower elastic plate, 2-protective net, 3-bottom plate, 4-double-shaft motor, 5-screw rod sleeve, 6-sliding block, 7-movable rod, 8-sliding groove, 9-screw rod, 10-spring, 11-air bag, 12-air inlet, 13-telescopic component, 131-connecting plate, 132-lifting frame, 133-elastic component, 14-clamping mechanism, 141-first fixing clip, 142-second fixing clip, 15-movable groove, 16-movable block, 17-adjusting component, 171-movable plate, 172-electric push rod, 18-roller and 19-control switch.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1-5, the safe anti-falling device for the construction of the building engineering comprises an elastic plate 1 and a protective net 2 connected to the periphery of the top of the elastic plate 1, and can play a role in protecting the periphery and prevent falling personnel from falling to the outside of the elastic plate 1 to cause more damage. The elastic plate 1 includes an upper elastic plate 101, a lower elastic plate 102, and a height adjusting mechanism connected to the bottom of the lower elastic plate 102. By arranging the height adjusting mechanism, the heights of the lower elastic plate 102 and the upper elastic plate 101 can be adjusted conveniently according to the height of a building.
The height adjusting mechanism comprises a bottom plate 3, a double-shaft motor 4, a screw rod sleeve 5, a sliding block 6 and a movable rod 7. The bottom of the bottom plate 3 is provided with a roller 18, which is convenient for moving the whole safety anti-falling device to a use place. The top of the bottom plate 3 is provided with a sliding chute 8. The double-shaft motor 4 is fixedly connected with the bottom of the sliding groove 8, two output shafts of the double-shaft motor 4 are respectively connected with screw rods 9 with opposite thread directions, and the other ends of the screw rods 9 are connected with the side wall of the bottom plate 3. The screw rod sleeve 5 is connected outside the screw rod 9 in a matching way and can move left and right relative to the screw rod 9. The slide block 6 is connected to the bottom of the screw rod sleeve 5 and can slide along the slide groove 8. The bottom end of the movable rod 7 is connected with the top of the screw rod sleeve 5, and the top end of the movable rod is connected with the bottom of the lower elastic plate 102. In order to facilitate the connection between the bottom end of the movable rod 7 and the top of the screw rod sleeve 5, a fixed plate can be connected to the top of the screw rod sleeve 5, and the bottom end of the movable rod 7 is connected to the fixed plate. Also, in order to facilitate the connection of the top end of the movable rod 7 with the bottom of the lower elastic plate 102, a fixed plate may be installed at the bottom of the lower elastic plate 102, and the top end of the movable rod 7 may be connected with the fixed plate. When the double-shaft motor 4 works, the screw rod 9 at the output end of the double-shaft motor 4 rotates to drive the screw rod sleeve 5 to move leftwards or rightwards along the screw rod 9, then the slide block 6 is driven to slide along the slide groove 8, and meanwhile, the movable rod 7 correspondingly moves upwards or downwards, so that the height of the lower elastic plate 102 is adjusted.
In order to improve the buffer function of the upper elastic plate 101 and the lower elastic plate 102, the safety anti-falling net of the invention is provided with a buffer mechanism between the upper elastic plate 101 and the lower elastic plate 102. The buffer mechanism comprises a spring 10 and an air bag 11, the spring 10 is connected between the corner of the upper elastic plate 101 and the corner of the lower elastic plate 102, the central axis of the air bag 11 is overlapped with the central axis of the upper elastic plate 101 and the central axis of the lower elastic plate 102, and the air bag 11 is provided with an air inlet 12.
To further enhance the cushioning effect, the present invention also provides a telescoping assembly 13 between the bladder 11 and the spring 10. The telescopic assembly 13 includes a link plate 131, a lifting frame 132, and an elastic member 133. The connection plates 131 include upper and lower connection plates arranged in pairs, and the connection plates 131 are connected to the bottom of the upper elastic plate 101 and the top of the lower elastic plate 102, respectively. The crane 132 is connected between the upper connection plate and the lower connection plate. The elastic member 133 is connected between the upper connection plate and the lower connection plate.
In order to facilitate the effective fixation between the safety anti-falling device and external construction equipment when in use, thereby facilitating the use, the invention is provided with clamping mechanisms 14 at two sides of the height adjusting mechanism. The clamping mechanism 14 comprises a first fixing clamp 141 and a second fixing clamp 142 which are hinged, and the first fixing clamp 141 and the second fixing clamp 142 are arranged in an X shape. The ends, far away from the height adjusting mechanism, of the first fixing clamp 141 and the second fixing clamp 142 are bent to form arc-shaped bayonets with opposite bayonets, so that the first fixing clamp 141 and the second fixing clamp 142 can clamp external construction equipment conveniently. One end of the first fixing clip 141 is fixedly connected to the sidewall of the bottom plate 3, and one end of the second fixing clip 142 is movably connected to the sidewall of the bottom plate 3 and can slide along the sidewall of the bottom plate 3. Specifically, the movable groove 15 has been seted up to the lateral wall of bottom plate 3, and the one end that second fixation clamp 142 and bottom plate 3 are connected with movable block 16, and movable block 16 can slide along movable groove 15, and then drives the lateral wall of second fixation clamp 142 along bottom plate 3 and slide.
In order to facilitate the control of the second fixing clip 142 to be close to or away from the first fixing clip 141, the present invention connects the adjusting assembly 17 between the first fixing clip 141 and the second fixing clip 142. The adjusting assembly 17 is disposed between the hinge point of the first fixing clip 141 and the second fixing clip 142 and the height adjusting mechanism, the adjusting assembly 17 includes a movable plate 171 and an electric push rod 172, the movable plate 171 is disposed in pair and is respectively hinged with the first fixing clip 141 and the second fixing clip 142, and the electric push rod 172 is connected between the movable plates 171. In order to facilitate the connection of the movable plate 171 with the first and second fixing clips 141 and 142, a fixing plate may be connected to the inner sides of the first and second fixing clips 141 and 142, and the movable plate 171 may be hingedly connected to the fixing plate.
In addition, the side wall of the bottom plate 3 is provided with a control switch 19, and the control switch 19 is electrically connected with the double-shaft motor 4 and the electric push rod 172. The control switch 19 is convenient for the staff to control the working state of the double-shaft motor 4 and the electric push rod 172.
The working principle and the using process of the safety anti-falling device are as follows: firstly, the safety anti-falling device is moved to the lower part of a scaffold through the roller 18, the control switch 19 is started, the electric push rod 172 works, the electric push rod 172 extends, the second fixing clamp 142 moves towards the direction close to the first fixing clamp 141, and the device is fixed between the scaffolds through the first fixing clamp 141 and the second fixing clamp 142.
Starting the control switch 19, the double-shaft motor 4 works to drive the screw rods 9 at two output ends of the double-shaft motor 4 to rotate, then the screw rod sleeve 5 is driven to move leftwards or rightwards, then the sliding block 6 is driven to slide along the sliding groove 8, and meanwhile the movable rod 7 correspondingly moves upwards or downwards to adjust the lower elastic plate 102 to a proper height. The control switch 19 is closed.
When a heavy object or a person falls, the person first falls onto the upper elastic plate 101, and a first layer of buffering is realized on impact force. The second layer of buffering is realized on the impact force through the buffering action of the spring 10, the air bag 11 and the buffering mechanism. The third layer of cushioning is achieved by the lower spring plate 102. Meanwhile, the protective net 2 protects the periphery, the protective effect is good, the anti-falling performance is strong, and the safety is high.
When the device is used, the electric push rod 172 is controlled to contract, the first fixing clamp 141 and the second fixing clamp 142 are opened, and the device is moved to other positions.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a safe anti-falling device is used in building engineering construction, includes elastic plate (1) and connects protection network (2) all around at elastic plate (1) top, its characterized in that: the elastic plate (1) comprises an upper elastic plate (101), a lower elastic plate (102) and a height adjusting mechanism, and the height adjusting mechanism is connected to the bottom of the lower elastic plate (102).
2. The safety catch device for construction of building engineering according to claim 1, wherein the height adjustment mechanism comprises:
the top of the bottom plate (3) is provided with a sliding chute (8);
the double-shaft motor (4) is arranged at the bottom of the sliding groove (8), two output shafts of the double-shaft motor (4) are respectively connected with screw rods (9) with opposite thread directions, and the other ends of the screw rods (9) are connected with the side wall of the bottom plate (3);
the screw rod sleeve (5) is connected to the outer part of the screw rod (9) in a matching way and can move left and right relative to the screw rod (9);
the sliding block (6) is connected to the bottom of the screw rod sleeve (5) and can slide along the sliding groove (8);
the bottom end of the movable rod (7) is connected to the top of the screw rod sleeve (5), and the top end of the movable rod is connected to the bottom of the lower elastic plate (102).
3. The safety fall-preventing device for building engineering construction according to claim 2, characterized in that: the bottom of the bottom plate (3) is provided with a roller (18).
4. The safety fall-preventing device for building engineering construction according to claim 1, characterized in that: the damping device further comprises a damping mechanism, and the damping mechanism is connected between the upper elastic plate (101) and the lower elastic plate (102).
5. The safety fall-preventing device for building engineering construction according to claim 4, characterized in that: buffer gear includes spring (10) and gasbag (11), spring (10) are connected between the bight of last elastic plate (101) and the bight of elastic plate (102) down, the axis of gasbag (11) and the axis of last elastic plate (101), the axis coincidence of lower elastic plate (102), be provided with air inlet (12) on gasbag (11).
6. The safety catch device for construction of building engineering according to claim 5, wherein the buffer mechanism further comprises a telescopic assembly (13) disposed between the air bag (11) and the spring (10), the telescopic assembly (13) comprising:
the connecting plates (131) comprise an upper connecting plate and a lower connecting plate which are arranged in pairs, and the connecting plates (131) are respectively connected to the bottom of the upper elastic plate (101) and the top of the lower elastic plate (102);
a lifting frame (132) connected between the upper connecting plate and the lower connecting plate;
and an elastic member (133) connected between the upper connection plate and the lower connection plate.
7. The safety fall-preventing device for building engineering construction according to claim 2, characterized in that: height adjusting mechanism's both sides are equipped with fixture (14), fixture (14) are including articulated first fixation clamp (141) and the second fixation clamp (142) of connecting, first fixation clamp (141) and second fixation clamp (142) are the setting of X shape, the one end fixed connection of first fixation clamp (141) is at height adjusting mechanism's lateral wall, the one end swing joint of second fixation clamp (142) is at height adjusting mechanism's lateral wall and can follow height adjusting mechanism's lateral wall and slide.
8. The safety fall-preventing device for building engineering construction according to claim 7, characterized in that: activity groove (15) have been seted up to height adjustment mechanism's lateral wall, the one end that second fixation clamp (142) and height adjustment mechanism are connected with movable block (16), movable block (16) can slide along activity groove (15), and then drive second fixation clamp (142) and slide along height adjustment mechanism's lateral wall.
9. The safety fall-preventing device for building engineering construction according to claim 7, characterized in that: be connected with between first fixation clamp (141) and the second fixation clamp (142) and adjust the subassembly (17), adjust the subassembly (17) and set up between the hinge point and the height adjustment mechanism of first fixation clamp (141) and second fixation clamp (142), adjust subassembly (17) including fly leaf (171) and electric putter (172), fly leaf (171) set up in pairs and respectively with first fixation clamp (141) and second fixation clamp (142) articulated connection, electric putter (172) are connected between fly leaf (171).
10. The safety fall-preventing device for building engineering construction according to claim 9, characterized in that: the lateral wall of bottom plate (3) is equipped with control switch (19), control switch (19) and biax motor (4) and the equal electric connection of electric putter (172).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911220955.7A CN110924699A (en) | 2019-12-03 | 2019-12-03 | Safe anti-falling device for constructional engineering construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911220955.7A CN110924699A (en) | 2019-12-03 | 2019-12-03 | Safe anti-falling device for constructional engineering construction |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501571A (en) * | 2020-05-09 | 2020-08-07 | 王锦洪 | Bridge construction anti-falling device |
| CN112234469A (en) * | 2020-09-30 | 2021-01-15 | 李靖 | Electric power safety electric leakage protector that factor of safety is high |
| CN112482575A (en) * | 2020-12-01 | 2021-03-12 | 中建一局集团建设发展有限公司 | Omnidirectional multi-level three-dimensional safety protection system with super high-rise structure |
| CN113086100A (en) * | 2021-04-30 | 2021-07-09 | 江南造船(集团)有限责任公司 | Hatch anti-falling device |
| CN113585789A (en) * | 2020-06-24 | 2021-11-02 | 汪晨 | Shock attenuation protector for building |
| CN114760793A (en) * | 2022-05-20 | 2022-07-15 | 厦门抱壹智能科技有限公司 | Laboratory intelligent high-throughput data acquisition terminal capable of automatically collecting information |
| CN115853020A (en) * | 2022-12-14 | 2023-03-28 | 贵州电网有限责任公司 | Pit falling-proof device |
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| CN111501571A (en) * | 2020-05-09 | 2020-08-07 | 王锦洪 | Bridge construction anti-falling device |
| CN113585789A (en) * | 2020-06-24 | 2021-11-02 | 汪晨 | Shock attenuation protector for building |
| CN112234469A (en) * | 2020-09-30 | 2021-01-15 | 李靖 | Electric power safety electric leakage protector that factor of safety is high |
| CN112234469B (en) * | 2020-09-30 | 2022-08-16 | 广西深柳电子科技有限公司 | Electric power safety electric leakage protector that factor of safety is high |
| CN112482575A (en) * | 2020-12-01 | 2021-03-12 | 中建一局集团建设发展有限公司 | Omnidirectional multi-level three-dimensional safety protection system with super high-rise structure |
| CN113086100A (en) * | 2021-04-30 | 2021-07-09 | 江南造船(集团)有限责任公司 | Hatch anti-falling device |
| CN114760793A (en) * | 2022-05-20 | 2022-07-15 | 厦门抱壹智能科技有限公司 | Laboratory intelligent high-throughput data acquisition terminal capable of automatically collecting information |
| CN114760793B (en) * | 2022-05-20 | 2024-01-23 | 厦门抱壹智能科技有限公司 | Laboratory intelligent high-flux data acquisition terminal capable of autonomously collecting information |
| CN115853020A (en) * | 2022-12-14 | 2023-03-28 | 贵州电网有限责任公司 | Pit falling-proof device |
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