CN210798460U - Iron tower cross arm rope ladder suspension point extension fixture - Google Patents
Iron tower cross arm rope ladder suspension point extension fixture Download PDFInfo
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- CN210798460U CN210798460U CN201921535225.1U CN201921535225U CN210798460U CN 210798460 U CN210798460 U CN 210798460U CN 201921535225 U CN201921535225 U CN 201921535225U CN 210798460 U CN210798460 U CN 210798460U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 77
- 239000000725 suspension Substances 0.000 title claims abstract description 34
- 150000002505 iron Chemical class 0.000 abstract description 9
- 238000009434 installation Methods 0.000 description 31
- 101150097115 dop-3 gene Proteins 0.000 description 17
- 238000000034 method Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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Abstract
The utility model discloses an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam, second crossbeam and dop, wherein, the second crossbeam is connected in the one end of first crossbeam and both on same straight line, and a dog is connected to the free end of second crossbeam for prevent to hang the rope ladder on the second crossbeam from its free end landing, the dop is two, connects respectively in the both ends of first crossbeam, the dop can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam. This iron tower cross arm rope ladder suspension point extension fixture simple structure, simple to operate, can assist and shorten the distance of operating personnel and mounting point, improve work efficiency, improve the security.
Description
Technical Field
The utility model belongs to the technical field of the installation of power transmission line monitoring facilities, concretely relates to under the circumstances that high tension overhead transmission line does not have a power failure, installation monitoring facilities's auxiliary device.
Background
When a traditional power transmission line is installed and disassembled in an electrified mode, or a vibration damper works, since the operating points are located at positions which are about 1.5m-2.0m away from the lower hanging point of the insulator, if a rope ladder is directly hung at the head of a cross arm of an iron tower, a worker standing on the rope ladder for operation has a certain distance from the mounting point, and the installation is inconvenient, if other modes are adopted, the operation is complex, the efficiency is low, and potential safety hazards exist.
Therefore, how to shorten the distance between the operator and the installation point and make the operator closer to the installation point becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an iron tower cross arm rope ladder hangs some extension fixture to operating personnel and operating point distance are far away when solving traditional transmission line live-line installation and dismantling detecting system or damper operation, and work efficiency is low, there is the problem of potential safety hazard.
The utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam, second crossbeam and dop, wherein, the second crossbeam is connected in the one end of first crossbeam and both on same straight line, and a dog is connected to the free end of second crossbeam for prevent to hang the rope ladder on the second crossbeam from its free end landing, the dop is two, connects respectively in the both ends of first crossbeam, the dop can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam.
Preferably, the first cross beam is sleeved with the second cross beam, a cavity is arranged in the middle of the first cross beam, and one end of the second cross beam is inserted into the cavity in a matched mode and the extending length of the second cross beam is adjustable.
Further preferably, the tip that meets with the second crossbeam of first crossbeam is provided with the spacing interior border of inside extension, the tip that meets with first crossbeam of second crossbeam be provided with spacing interior border complex stopper, spacing interior border can prevent the stopper roll-off, and then prevents that the second crossbeam from droing from first crossbeam.
Further preferably, spacing interior border is two, vertical connection respectively in the left and right sides of the tip of first crossbeam, the height of second crossbeam is the same with the height of the cavity that first crossbeam middle part set up.
Further preferably, the clip is L-shaped and is screwed to both end portions of the first cross member.
Preferably, the two end parts of the first cross beam are provided with a plurality of threaded holes at intervals, one end of the clamping head is screwed in from the lower part of the threaded hole, and is locked by a nut after being screwed out from the upper part of the threaded hole.
Further preferably, first crossbeam includes first crossbeam A section, first crossbeam B section and inserted bar, first crossbeam A section and first crossbeam B section cup joint, and the tip interval that first crossbeam A section and first crossbeam B section are close is provided with a plurality of vertical jacks, and after the length of adjustment first crossbeam, insert the inserted bar simultaneously in the vertical jack that corresponds on first crossbeam A section and the first crossbeam B section, can realize the fixed connection of first crossbeam A section and first crossbeam B section.
Further preferably, the device for extending the suspension point of the iron tower cross arm rope ladder further comprises a chuck connecting rod, wherein the length of the chuck connecting rod is adjustable, and two ends of the chuck connecting rod can be respectively butted with free ends of two chucks which are arranged oppositely.
Preferably, the cross section of the first beam and the cross section of the second beam are both square.
Further preferably, bulges matched with the rope ladder hanging points are arranged on the second cross beam at intervals, so that the rope ladder hanging points can be fixed on the second cross beam.
The utility model provides an iron tower cross arm rope ladder suspension point extension fixture's mounting method as follows: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
The utility model provides an iron tower cross arm rope ladder hangs some extension fixture, simple structure, convenient to use can be under the circumstances that high tension overhead transmission line does not have a power failure, supplementary installation monitoring facilities shortens operating personnel and operating point's distance, improves work efficiency, improves the security.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments:
fig. 1 is a schematic structural view of an iron tower cross arm rope ladder suspension point extension device provided by the utility model;
FIG. 2 is a schematic view of an end structure of a first beam;
FIG. 3 is a schematic structural view of a second beam;
fig. 4 is another schematic structural view of the device for extending suspension points of the cross arm rope ladder of the iron tower provided by the utility model.
Detailed Description
The invention will be further explained below with reference to specific embodiments, without limiting the invention.
Example 1
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam 1, second crossbeam 2 and dop 3, wherein, second crossbeam 2 is connected in the one end of first crossbeam 1 and both on same straight line, and a dog 21 is connected to the free end of second crossbeam 2 for prevent to hang the rope ladder on second crossbeam 2 from its free end landing, dop 3 is two, connects respectively in the both ends of first crossbeam 1, dop 3 can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam 1, wherein, the tangent plane of first crossbeam 1 and second crossbeam 2 is preferred squarely, the preferred anti-skidding line that sets up along its length direction that is provided with on the first crossbeam.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 2
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam 1, second crossbeam 2 and dop 3, wherein, second crossbeam 2 is connected in the one end of first crossbeam 1 and both on same straight line, and a dog 21 is connected to the free end of second crossbeam 2 for prevent to hang the rope ladder on second crossbeam 2 from its free end landing, dop 3 is two, connects respectively in the both ends of first crossbeam 1, dop 3 can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam 1, wherein, first crossbeam 1 cup joints with second crossbeam 2, the middle part of first crossbeam 1 is provided with the cavity, the one end cooperation of second crossbeam 2 insert in just stretch out the length is adjustable in the cavity.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: through the dop with first crossbeam along the top that the line direction was fixed in the iron tower cross arm, simultaneously, guarantee that the second crossbeam is located operating point place one side, hang the rope ladder on the second crossbeam, realize both reliable connections, can reduce the distance of staff and operating point on the rope ladder, the extension length of second crossbeam is adjustable, and extension length is preferred 1.0 ~ 1.2m, can be according to the extension length of mounting point position adjustment.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 3
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam 1, second crossbeam 2 and dop 3, wherein, second crossbeam 2 is connected in the one end of first crossbeam 1 and both on same straight line, and a dog 21 is connected to the free end of second crossbeam 2 for prevent to hang the rope ladder on second crossbeam 2 from its free end landing, dop 3 is two, connects respectively in the both ends of first crossbeam 1, dop 3 can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam 1, wherein, first crossbeam 1 cup joints with second crossbeam 2, the middle part of first crossbeam 1 is provided with the cavity, the cooperation of the one end of second crossbeam 2 insert in just reach out the length is adjustable in the cavity, the tip that meets with second crossbeam 2 of first crossbeam 1 is provided with the spacing interior border 11 (as shown in figure 2) of inside extension, the tip that meets with first crossbeam 1 of second crossbeam 2 be provided with spacing interior border 11 complex 22 (as shown in figure 3) Shown), spacing interior border 11 can prevent stopper 22 roll-off, and then prevents that second crossbeam 2 from droing from first crossbeam 1, has further improved the security of operation.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 4
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam 1, second crossbeam 2 and dop 3, wherein, second crossbeam 2 is connected in the one end of first crossbeam 1 and both on same straight line, and a dog 21 is connected to the free end of second crossbeam 2 for prevent to hang the rope ladder on second crossbeam 2 from its free end landing, dop 3 is two, connects respectively in the both ends of first crossbeam 1, dop 3 can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam 1, wherein, first crossbeam 1 cup joints with second crossbeam 2, the middle part of first crossbeam 1 is provided with the cavity, the cooperation of the one end of second crossbeam 2 insert in just reach out the length is adjustable in the cavity, the tip that meets with second crossbeam 2 of first crossbeam 1 is provided with the spacing interior border 11 (as shown in figure 2) of inside extension, the tip that meets with first crossbeam 1 of second crossbeam 2 be provided with spacing interior border 11 complex 22 (as shown in figure 3) It is shown), stopper 22 roll-off can be prevented to spacing interior border 11, and then prevents that second crossbeam 2 from droing from first crossbeam 1, has further improved the security of operation, spacing interior border 11 is two (as shown in fig. 2), respectively vertical connection in the left and right sides of the tip of first crossbeam 1, the height of second crossbeam 2 is the same with the height of the cavity that first crossbeam 1 middle part set up (as shown in fig. 3), can guarantee that second crossbeam is more firm with being connected of first crossbeam.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 5
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: first crossbeam 1, second crossbeam 2 and dop 3, wherein, second crossbeam 2 is connected in the one end of first crossbeam 1 and both on same straight line, and a dog 21 is connected to the free end of second crossbeam 2 for prevent to hang the rope ladder on second crossbeam 2 from its free end landing, dop 3 is two, connects respectively in the both ends of first crossbeam 1, dop 3 can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam 1, wherein, dop 3 is the L type, threaded connection in the both ends of first crossbeam 1, the dop of L type can stabilize the joint with iron tower cross arm, simultaneously, the adjustable distance of its base and first crossbeam of dop with first crossbeam threaded connection to adapt to the iron tower cross arm of not co-altitude.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 6
The difference from the example 5 is that: the utility model discloses a first crossbeam, including first crossbeam 1, the both ends of first crossbeam are all provided with a plurality of screw holes at the interval, the one end of dop 3 is twisted by the below of screw hole, and through nut locking after the top of screw hole is twisted out, through twisting two dops respectively in the different screw holes in first crossbeam both ends, the distance of two dops can be adjusted to the iron tower cross arm of adaptation different width.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 7
As shown in fig. 1, the utility model provides an iron tower cross arm rope ladder hangs some extension fixture, include: the first cross beam 1, the second cross beam 2 and the two chucks 3 are arranged on the same straight line, the free end of the second cross beam 2 is connected with a stop block 21 for preventing the rope ladder hung on the second cross beam 2 from sliding off from the free end, the two chucks 3 are respectively connected with two ends of the first cross beam 1, the chucks 3 can be clamped with the cross arm of the iron tower and used for fixing the first cross beam 1 above the cross arm of the iron tower, the first cross beam 1 comprises a first cross beam A section, a first cross beam B section and inserted rods, the first cross beam A section and the first cross beam B section are sleeved, a plurality of vertical insertion holes are arranged at intervals of the end parts of the first cross beam A section and the first cross beam B section, and the inserted rods are simultaneously inserted into the corresponding vertical insertion holes on the first cross beam A section and the first cross beam B section after the length of the first cross beam 1 is adjusted, can realize the fixed connection of first crossbeam A section and first crossbeam B section, through inserting the inserted bar in the vertical jack of difference, can realize the adjustment to first crossbeam length, the iron tower cross arm of adaptable different widths.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 8
The difference from example 1 is that: as shown in fig. 4, the device for extending the suspension point of the iron tower cross arm rope ladder further comprises a chuck connecting rod 4, wherein the length of the chuck connecting rod 4 is adjustable, and two ends of the chuck connecting rod can be respectively butted with free ends oppositely arranged by two chucks 3, so that the connection between the extending device and the iron tower cross arm is more stable through the chuck connecting rod.
The installation method of the device for extending the suspension point of the cross arm rope ladder of the iron tower comprises the following steps: the first cross beam is fixed above the iron tower cross arm along the line direction through the clamping head, meanwhile, the second cross beam is guaranteed to be located on one side of the operating point, the rope ladder is hung on the second cross beam, the rope ladder and the second cross beam are reliably connected, and the distance between a worker on the rope ladder and the operating point can be shortened.
This iron tower cross arm rope ladder suspension point extension fixture, multiplicable distance of hanging the rope ladder along the line mainly is to the electrified installation of distributed fault indicator, still has electrified installation simultaneously and dismantles the function of damper concurrently, has avoided personnel and the far away problem of mounting point distance, has guaranteed operation personnel's personal safety, has improved the completion rate of work.
Example 9
The difference from example 1 is that: the second cross beam 2 is provided with bulges matched with the rope ladder hanging points at intervals, and the rope ladder hanging points can be fixed on the second cross beam 2.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. Iron tower cross arm rope ladder suspension point extension fixture, its characterized in that includes: first crossbeam (1), second crossbeam (2) and dop (3), wherein, second crossbeam (2) are connected in the one end of first crossbeam (1) and both on same straight line, and a dog (21) is connected to the free end of second crossbeam (2) for prevent to hang rope ladder on second crossbeam (2) from its free end landing, dop (3) are two, connect respectively in the both ends of first crossbeam (1), dop (3) can with iron tower cross arm joint for be fixed in the top of iron tower cross arm with first crossbeam (1).
2. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: the first cross beam (1) is sleeved with the second cross beam (2), a cavity is formed in the middle of the first cross beam (1), and one end of the second cross beam (2) is inserted into the cavity in a matched mode and is adjustable in extension length.
3. The iron tower cross arm rope ladder suspension point extension device of claim 2, characterized in that: the tip that meets with second crossbeam (2) of first crossbeam (1) is provided with spacing interior border (11) of inside extension, the tip that meets with first crossbeam (1) of second crossbeam (2) be provided with spacing interior border (11) complex stopper (22), spacing interior border (11) can prevent stopper (22) roll-off, and then prevent that second crossbeam (2) from droing from first crossbeam (1).
4. The iron tower cross arm rope ladder suspension point extension device of claim 3, characterized in that: the two limiting inner edges (11) are vertically connected to the left side and the right side of the end of the first cross beam (1) respectively, and the height of the second cross beam (2) is the same as that of a cavity formed in the middle of the first cross beam (1).
5. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: the clamping heads (3) are L-shaped and are in threaded connection with two end parts of the first cross beam (1).
6. The iron tower cross arm rope ladder suspension point extension device of claim 5, characterized in that: the two ends of the first cross beam (1) are provided with a plurality of threaded holes at intervals, one end of the clamping head (3) is screwed in from the lower part of the threaded hole, and is locked by a nut after being screwed out from the upper part of the threaded hole.
7. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: first crossbeam (1) includes first crossbeam A section, first crossbeam B section and inserted bar, first crossbeam A section and first crossbeam B section cup joint, and the tip interval that first crossbeam A section and first crossbeam B section are close is provided with a plurality of vertical jacks, and after the length of adjustment first crossbeam (1), insert the inserted bar simultaneously in the vertical jack that corresponds on first crossbeam A section and the first crossbeam B section, can realize the fixed connection of first crossbeam A section and first crossbeam B section.
8. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: still include dop connecting rod (4), the length of dop connecting rod (4) is adjustable, and its both ends can dock with the free end that two dops (3) set up relatively respectively.
9. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: the section of the first beam (1) and the section of the second beam (2) are both square.
10. The iron tower cross arm rope ladder suspension point extension device of claim 1, characterized in that: the second cross beam (2) is provided with bulges matched with the rope ladder hanging points at intervals, so that the rope ladder hanging points can be fixed on the second cross beam (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921535225.1U CN210798460U (en) | 2019-09-17 | 2019-09-17 | Iron tower cross arm rope ladder suspension point extension fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921535225.1U CN210798460U (en) | 2019-09-17 | 2019-09-17 | Iron tower cross arm rope ladder suspension point extension fixture |
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| CN210798460U true CN210798460U (en) | 2020-06-19 |
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| CN201921535225.1U Active CN210798460U (en) | 2019-09-17 | 2019-09-17 | Iron tower cross arm rope ladder suspension point extension fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499951A (en) * | 2019-09-17 | 2019-11-26 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of steel tower cross-arm rope ladder hitch point extends device and application |
-
2019
- 2019-09-17 CN CN201921535225.1U patent/CN210798460U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499951A (en) * | 2019-09-17 | 2019-11-26 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of steel tower cross-arm rope ladder hitch point extends device and application |
| CN110499951B (en) * | 2019-09-17 | 2024-04-19 | 国网辽宁省电力有限公司辽阳供电公司 | Iron tower cross arm rope ladder hanging point extension device and application |
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