A peripheral warning fence for power maintenance

Abstract

The present invention discloses a peripheral warning fence for power maintenance, which relates to the technical field of fences, and includes two posts and a first scissor-type telescopic fence and a second scissor-type telescopic fence arranged in a front-to-back staggered manner. Each end of the first scissor-type telescopic fence and the second scissor-type telescopic fence in the telescopic direction includes a hinged end and a sliding end. The two hinged ends of the first scissor-type telescopic fence are each hinged to the top of a post, and the two sliding ends are each vertically slidably connected to a post. The two hinged ends of the second scissor-type telescopic fence are each hinged to the bottom of a post, and the two sliding ends are each vertically slidably connected to a post. When the bottom of the first scissor-type telescopic fence is aligned with the top of the second scissor-type telescopic fence, it is locked by a locking member. The present invention can provide a longer enclosure length while ensuring the height requirement, so that fewer fence monomers can enclose a construction area of ​​a target size, and it is more convenient to build, dismantle and transport.

Description

Technical Field

[0001] The invention relates to the technical field of fences, in particular to a peripheral warning fence for electric power maintenance. Background Art

[0002] There are many potential safety hazards at power maintenance sites. Power equipment may carry high voltages, and maintenance personnel need to concentrate on operating them during operations. At the same time, they must also prevent non-staff from accidentally entering the maintenance area. For example, when performing transformer maintenance at a substation, even if the equipment has been powered off, residual charges or possible accidental power-on conditions may still pose a risk of electric shock to entrants. There may be other dangerous factors at the maintenance site, such as the placement of maintenance tools, disassembled equipment parts, etc., which may cause tripping, collisions, and other injuries to people who accidentally enter. The outer warning fence can effectively isolate these dangers and provide a relatively safe enclosed space for maintenance work.

[0003] The outer warning fence used for power maintenance is generally used temporarily, requiring easy transportation, construction and dismantling. For example, the patent publication with the announcement number CN221524436U discloses a safety fence for power maintenance that is easy to dismantle, which includes a base and columns. There are two columns, a barrier is fixedly installed between the two columns, and a disassembly mechanism is provided between the two columns and the base. It is convenient for personnel to dismantle the barrier, thereby facilitating personnel to maintain or carry the barrier, improving personnel's work efficiency, and facilitating personnel to use.

[0004] Another example is the patent with announcement number CN216665225U, which discloses a fence for power engineering sites, which includes a bottom plate, a universal wheel fixedly installed at the bottom of the bottom plate, a first support plate fixedly installed at the top of the bottom plate, a first connecting seat fixedly installed at one side of the first support plate, a first sliding groove is provided inside the first connecting seat, a first slider is movably connected inside the first connecting seat, a first movable rod is movably connected inside the first slider, a second movable rod is movably connected to the outer wall of the first movable rod, a second slider is movably connected to one end of the second movable rod, and a second connecting seat is movably connected to the outer wall of the second slider. This can make the device easy to disassemble and install, and convenient to splice, so that the fences can be easily connected and fixed, thereby facilitating the adjustment of the size of the enclosure.

[0005] In the prior art such as the above-mentioned patent, the fence has the function of contraction and extension, which can be easily built, dismantled and transported. However, a common shortcoming is that the length and height of each fence unit when unfolded are at opposite sides, that is, the longer the unfolded fence length, the shorter the fence height. If the fence height is to be guaranteed, the unfolded fence length of the fence cannot be too long. Therefore, a construction area of ​​the target size of the fence requires more fence units for splicing, and the demand for more fence units will increase the burden of assembly, dismantling and transportation. Summary of the invention

[0006] The object of the present invention is to provide a peripheral warning fence for power maintenance to solve the deficiencies in the above-mentioned prior art.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a peripheral warning fence for power maintenance, comprising two parallel and aligned upright posts, a first scissors-type telescopic fence and a second scissors-type telescopic fence arranged in a front-to-back staggered manner are arranged between the two upright posts, the first scissors-type telescopic fence and the second scissors-type telescopic fence respectively have two ends in the telescopic direction, each end comprises a hinged end and a sliding end, the first scissors-type telescopic fence, its two hinged ends are respectively hinged to the top of a post, and its two sliding ends are respectively vertically slidably connected to a post, the second scissors-type telescopic fence, its two hinged ends are respectively hinged to the bottom of a post, and its two sliding ends are respectively vertically slidably connected to a post, and when the bottom of the first scissors-type telescopic fence is aligned with the top of the second scissors-type telescopic fence, it is locked by a locking member.

[0008] Furthermore, the locking member includes a sleeve and a ball head, the sleeve is fixedly connected to a first rotating shaft at the bottom of the first scissors-type telescopic fence, the top of the sleeve has an opening, and a weight is fixedly connected to the bottom, a slot is provided on one side of the sleeve (close to the second scissors-type telescopic fence), a block is elastically provided at the junction of the slot and the opening, and a first inclined surface is provided on the side of the block away from the slot, the ball head is fixedly connected to a second rotating shaft at the top of the second scissors-type telescopic fence through an extension shaft, when the bottom of the first scissors-type telescopic fence is aligned with the top of the second scissors-type telescopic fence, the extension shaft squeezes the block open to allow the ball head to enter the interior of the sleeve from the mouth of the sleeve, and then the block is reset to the junction of the slot and the opening to lock the extension shaft in the slot.

[0009] Furthermore, the block is connected to the end face of the opening along the circumferential sliding direction of the sleeve, an annular spring is embedded on the sleeve along the circumferential direction, one end of the annular spring is connected to the sleeve, and the other end is connected to the block, and the elastic force acts on the block in the direction of the slot.

[0010] Furthermore, the block has a second inclined surface on a side away from the first inclined surface.

[0011] Furthermore, the side of the card block away from the first inclined surface is a horizontal plane, and the first rotating shaft where the sleeve is located is horizontally rotatably connected to a rotating rod, and a pull rope is movably provided on the first rotating shaft where the sleeve is located, one end of the pull rope is connected to the card block, and the other end is connected to the rotating rod, and a support rod is elastically rotatably connected to the rotating rod, and the support rod can abut and cooperate with the first rotating shaft adjacent to the bottom of the first scissors-type telescopic fence, and the rotating stroke of the rotating rod has a first station where the card block is located in the slot and a second station where the card block is separated from the slot by the pull rope.

[0012] Furthermore, a torsion spring is sleeved on the rotating shafts of the rotating rod and the push rod, one end of the torsion spring is connected to the rotating rod, and the other end is connected to the push rod.

[0013] Furthermore, a first base fixedly connected to the ground is disposed at the bottom of one of the columns, and a roller or a second base fixedly connected to the ground is disposed at the bottom of the other column.

[0014] Furthermore, at least one hinged end of the first scissor-type telescopic fence and / or the second scissor-type telescopic fence is provided with a threaded knob, and the threaded knob can tightly lock the corresponding hinged end on the corresponding column during the screwing process.

[0015] In the above technical scheme, the present invention provides a peripheral warning fence for power maintenance, wherein a first scissors-type telescopic fence and a second scissors-type telescopic fence are arranged between two columns in a front-to-back staggered manner; after being stored, the first scissors-type telescopic fence and the second scissors-type telescopic fence overlap front to back, occupying a small volume and being convenient for transportation; after being unfolded, the first scissors-type telescopic fence and the second scissors-type telescopic fence are butted up and down and locked by a locking member to ensure the structural strength of the entire scissors-type telescopic fence; while ensuring the height requirement, a longer enclosure length can be provided, so that fewer fence units can enclose a construction area of ​​the target size, and construction, dismantling and transportation are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure when unfolded provided by an embodiment of the present invention;

[0018] Figure 2 A front view of the overall structure when unfolded provided by an embodiment of the present invention;

[0019] Figure 3A schematic diagram of a column and a first scissor-type telescopic fence provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a column and a second scissor-type telescopic fence provided in an embodiment of the present invention;

[0021] Figure 5 A schematic structural diagram of a first scissor-type telescopic fence provided in an embodiment of the present invention;

[0022] Figure 6 A schematic structural diagram of another first scissor-type telescopic fence provided in an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the installation structure of the locking member provided in the embodiment of the present invention Figure Ⅰ ;

[0024] Figure 8 Schematic diagram of the installation structure of the locking member provided in the embodiment of the present invention Figure II ;

[0025] Fig. 9 A schematic diagram of a partial structure of a locking member provided in an embodiment of the present invention located on a first scissor-type telescopic fence;

[0026] Fig.10 A schematic diagram of a partial structure of a locking member provided in an embodiment of the present invention located on a second scissor-type telescopic fence;

[0027] Fig.11 A schematic diagram of the structure of a locking state of a locking member provided in an embodiment of the present invention;

[0028] Fig.12 A schematic diagram of the structure of a locking member in an unlocked state provided by an embodiment of the present invention;

[0029] Fig.13 A schematic diagram of the overall structure during contraction provided by an embodiment of the present invention;

[0030] Fig.14 A top view of the overall structure when it is contracted provided by an embodiment of the present invention;

[0031] Fig.15 A schematic diagram of the overall structure during contraction provided by another embodiment of the present invention;

[0032] Fig.16 For the present invention Fig.15 A magnified view of the structure at A;

[0033] Fig.17 A schematic structural diagram of a locking state of a locking member provided by another embodiment of the present invention;

[0034] Fig.18A schematic structural diagram of a locking member in an unlocked state provided by another embodiment of the present invention;

[0035] Fig.19 Schematic diagram of enclosure form provided by an embodiment of the present invention Figure Ⅰ ;

[0036] Fig. 20 Schematic diagram of enclosure form provided by an embodiment of the present invention Figure II ;

[0037] Fig.21 Schematic diagram of enclosure form provided by an embodiment of the present invention Figure III .

[0038] Description of reference numerals:

[0039] 1. Upright column; 11. First base; 12. Roller; 2. First scissor-type telescopic fence; 21. First hinged end; 22. First sliding end; 23. First rotating shaft; 3. Second scissor-type telescopic fence; 31. Second hinged end; 32. Second sliding end; 33. Second rotating shaft; 4. Locking member; 41. Sleeve; 42. Weight; 43. Slot; 44. Annular spring; 45. Block; 451. First inclined plane; 452. Second inclined plane; 453. Horizontal plane; 46. Pull rope; 47. Rotating rod; 48. Retaining rod; 49. Ball head; 410. Extension shaft; 5. Threaded knob. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] See also Figure 1-Figure 21An embodiment of the present invention provides a peripheral warning fence for power maintenance, comprising two posts 1, the two posts 1 are arranged in parallel and aligned, a first scissors-type telescopic fence 2 and a second scissors-type telescopic fence 3 are arranged in a front-to-back staggered manner between the two posts 1, the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 have the same structure, the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 respectively have two ends in the telescopic direction, each end includes a hinged end and a sliding end, that is: the first scissors-type telescopic fence 2 has two first ends in the telescopic direction, each first end respectively includes a first hinged end 21 and a first sliding end 22, the second scissors-type telescopic fence 3 has two second ends in the telescopic direction, each second end respectively includes a second hinged end 31 and a second sliding end 32. For the first scissor-type telescopic fence 2, its two first hinged ends 21 are respectively hinged to the top of a column 1, and its two first sliding ends 22 are respectively connected to a column 1 in a vertical sliding manner; for the second scissor-type telescopic fence 3, its two second hinged ends 31 are respectively hinged to the bottom of a column 1, and its two second sliding ends 32 are respectively connected to a column 1 in a vertical sliding manner. A locking member 4 is provided between the two first scissor-type telescopic fences 2 and the second scissor-type telescopic fences 3, and when the first scissor-type telescopic fences 2 and the second scissor-type telescopic fences 3 are butted up and down, that is, when the bottom of the first scissor-type telescopic fence 2 is aligned with the top of the second scissor-type telescopic fence 3, they are locked by the locking member 4.

[0042] In the above technical solution, a first scissors-type telescopic fence 2 and a second scissors-type telescopic fence 3 are arranged between the two columns 1 in a front-to-back staggered manner. After being stored, the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 overlap front to back, occupying a small volume and convenient for transportation. After being unfolded, the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 are butted up and down and locked by a locking member 4 to ensure the structural strength of the entire scissors-type telescopic fence. While ensuring the height requirement, a longer enclosure length can be provided. Therefore, fewer fence units can enclose a construction area of ​​the target size, and construction, dismantling and transportation are more convenient.

[0043] The number of locking members 4 is multiple, at least one, and in order to facilitate the locking and unlocking of the locking member 4, the locking member 4 includes a sleeve 41 and a ball head 49, the sleeve 41 is coaxially fixedly connected or coaxially rotatably connected to a first rotating shaft 23 at the bottom of the first scissor-type telescopic fence 2, the top of the sleeve 41 has an opening, and a weight block 42 is fixedly connected to the bottom, and the weight block 42 can be circular or directional. During the extension and retraction of the first fork-type telescopic fence, the gravity of the weight block 42 can keep the opening of the sleeve 41 always facing upward, so as to align with the ball head 49 later. Then, a slot 43 is provided on the sleeve 41 on one side close to the second scissor-type telescopic fence 3, and a block 45 is elastically and movably provided at the junction of the slot 43 and the opening, and a first inclined surface 451 is provided on the side of the block 45 away from the slot 43. The specific method of elastic arrangement here is that the block 45 is slidably connected to the end surface of the opening along the circumferential direction of the sleeve 41, and an annular spring 44 is embedded in the sleeve 41 along the circumferential direction, one end of the annular spring 44 is connected to the sleeve 41, and the other end is connected to the block 45, and the elastic force acts on the block 45 in the direction of the slot 43. The ball head 49 is fixedly connected to a second rotating shaft 33 at the top of the second scissor-type telescopic fence 3 through the extension shaft 410. The projections of the ball head 49 and the sleeve 41 of the same locking member 4 in the vertical direction (ignoring the shape) always remain overlapped, and the projections of the extended shaft 410, the first inclined surface 451 and the slot 43 in the vertical direction (ignoring the shape) also remain overlapped, and do not change with the extension and retraction of the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3, but the height difference between the two will change.

[0044] The two uprights 1 are separated so that the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 are extended, the bottom of the first scissor-type telescopic fence 2 is gradually lowered, and the top of the second scissor-type telescopic fence 3 is gradually raised, until the bottom of the first scissor-type telescopic fence 2 is about to be aligned with the top of the second scissor-type telescopic fence 3, the extension shaft 410 squeezes the first inclined surface 451 to squeeze the block 45 out of the slot 43, the annular spring 44 is compressed and stores energy, the extension shaft 410 can enter the slot 43, and at the same time the ball head 49 can enter the interior of the sleeve 41 from the mouth of the sleeve 41, and at the height of the extension shaft 410 When the height is lower than the block 45, the elastic force of the annular spring 44 is released, causing the block 45 to reset to the junction of the slot 43 and the opening, locking the extension shaft 410 in the slot 43, thereby locking the ball head 49 in the sleeve 41. The sleeve 41 restricts the ball head 49 in all directions (vertical direction, front and rear direction, and telescopic direction), thereby locking the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 after they are fully unfolded, making the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 a whole, ensuring the strength of the structure, and not easily deformed or knocked open.

[0045] As for the design of the side of the block 45 away from the first inclined surface 451, two embodiments are provided. In one embodiment, the side of the block 45 away from the first inclined surface 451 has a second inclined surface 452 (such as Figure 9-12 The advantage of this design is that the structure is relatively simple. After the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 are fully unfolded and locked by the locking member 4 (as shown in FIG. Fig.11 As shown in the figure, the elastic force of the annular spring 44 makes the block 45 always remain at the mouth of the slot 43 to block the extension shaft 410, so that the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 are not easy to shrink. When shrinking and storing is required, the operator only needs to apply a large force to close the two columns 1 to overcome the elastic force of the annular spring 44, so that the extension shaft 410 squeezes the block 45 from the mouth of the slot 43 by squeezing the second inclined surface 452, so that the ball head 49 can only be separated from the sleeve 41 (as shown in the figure). Fig.12 As shown), the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 can be retracted, which is very convenient to operate.

[0046] In another embodiment, the side of the block 45 away from the first inclined surface 451 is a horizontal surface 453 (eg Figure 15-18 As shown). The advantage of such a design is that even if the two columns 1 are closed with force, the extension shaft 410 will not be separated from the slot 43, and the column 1 will not be separated from the sleeve 41, which further enhances the connection strength between the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3. However, when the locking member 4 is unlocked, the operator needs to peel the block 45 off the mouth of the slot 43 and close the two columns 1 for storage. In order to solve the current situation that the operator cannot let go after unlocking and needs to close the column 1 while keeping the block 45 out of the slot 43, this embodiment also has a supplementary design, that is, a rotating rod 47 is horizontally rotatably connected to the first rotating shaft 23 where the sleeve 41 is located, and a pull rope 46 is movably inserted on the first rotating shaft 23 where the sleeve 41 is located, one end of the pull rope 46 is connected to the block 45, and the other end is connected to the rotating rod 47, and a push rod 48 is elastically rotatably connected to the rotating rod 47. Here, the elastic rotation connection is specifically that a torsion spring (not shown in the figure) is sleeved on the rotation axis of the rotating rod 47 and the abutment rod 48, one end of the torsion spring is connected to the rotating rod 47, and the other end is connected to the abutment rod 48. The abutment rod 48 can be abutted and matched with the first rotating shaft 23 adjacent to the bottom of the first scissor-type telescopic fence 2, and the rotation of the rotating rod 47 relative to the corresponding first rotating shaft 23 and the rotation of the abutment rod 48 relative to the rotating rod 47 are respectively provided with a limit block for limiting the rotation angle, and the rotating stroke of the rotating rod 47 has a first position in which the clamping block 45 is located at the clamping groove 43 and a second position in which the clamping block 45 is separated from the clamping groove 43 by the pull rope 46.

[0047] In this embodiment, the locking member 4 is in a locked state (such as Fig.17As shown in the figure, the operator moves the lever to rotate the lever from the first position to the second position, and the block 45 can be pulled away from the slot 43 by the pull rope 46, and the unlocking member is unlocked, and the annular spring 44 is compressed and energy is stored. In the process of rotating the lever from the first position to the second position, the pull rope 46 will pass from one side of the rotating shaft of the rotating rod 47 and the push rod 48 to the other side. At this time, the elastic force of the annular spring 44 will keep the rotating rod 47 in the second position, and the push rod 48 is in a state of being able to abut and cooperate with the first rotating shaft 23 adjacent to the bottom of the first scissor-type telescopic fence 2 with the rotating rod 47 (as shown in the figure). Fig.15 , Fig.16 and Fig.18 As shown), the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 are then contracted, and the ball head 49 moves up and away from the sleeve 41. During the contraction process, the push rod 48 abuts against the first rotating shaft 23 adjacent to the bottom of the first scissors-type telescopic fence 2, so that the push rod 48 overcomes the elastic force of the torsion spring and rotates relative to the rotating rod 47, causing the rotating rod 47 to rotate out of the second station and stretch back across the rotating shaft again. Then the elastic force of the annular spring 44 can be released, on the one hand, allowing the block 45 to block the mouth of the slot 43 again, and on the other hand, the block 45 pulls the rotating rod 47 to the first station through the pull rope 46.

[0048] In this way, the operator can let go of the swing rotating rod 47 after the card block 45 is disengaged from the card slot 43, and then close the two columns 1 to shrink and store the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3. During the storage process, the rotating rod 47 can be automatically reset to the first position and the card block 45 can be reset to the mouth of the card slot 43 without additional operation, which greatly facilitates the storage operation for the operator, even one person can operate it, and it is also convenient for the operator to only need to unfold the first scissors-type telescopic fence 2 and the second scissors-type telescopic fence 3 locking piece 4 to automatically lock it when using it next time.

[0049] There are also two ways to arrange the two columns 1. One is that the bottom of one of the columns 1 is provided with a first base 11 fixedly connected to the ground, and the bottom of the other column 1 is provided with a second base fixedly connected to the ground, that is, both columns 1 can be fixed to the ground, and the first base 11 and the second base can be fixed to the ground by ground piles or bolts. The other is that the bottom of one of the columns 1 is provided with a first base 11 fixedly connected to the ground, and the first base 11 is, for example, a heavy counterweight seat, and the bottom of the other column 1 is provided with a roller 12. After fixing the first base 11, the column 1 with the roller 12 is pulled, and the two columns 1 are easily separated by the roller 12, driving the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 to stretch out. After the locking member 4 is locked, the distance between the two columns 1 is fixed, and even if the bottom of one of the columns 1 is a roller 12, it will not move. This method is more convenient to operate.

[0050] The outer warning fence for power maintenance in the present invention has several other expandable enclosure forms, which can enrich the enclosure forms and is more practical and novel. When the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 are not fully unfolded, the overlapping degree of the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 is different, and the enclosure forms displayed are also different (such as Figure 19-21 As shown in the figure, this is an effect that cannot be achieved by the existing telescopic fence. Since the first scissor-type telescopic fence 2 and the second scissor-type telescopic fence 3 are not fully unfolded, the locking member 4 cannot be locked, so the structure is further optimized, that is, a threaded knob 5 is provided on at least one hinged end of the first scissor-type telescopic fence 2 and / or the second scissor-type telescopic fence 3, and the threaded knob 5 can lock the corresponding hinged end against the corresponding column 1 during the screwing process.

[0051] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A peripheral warning fence for power maintenance, comprising two parallel and aligned upright posts, characterized in that: A first scissor-type telescopic fence and a second scissor-type telescopic fence arranged in a front-to-back staggered manner are arranged between the two upright posts; The first scissor-type telescopic fence and the second scissor-type telescopic fence respectively have two ends in the telescopic direction, and each end includes a hinged end and a sliding end; The first scissor-type telescopic fence has two hinged ends each hinged to the top of a column, and two sliding ends each vertically slidably connected to a column; The second scissor-type telescopic fence has two hinged ends each hinged to the bottom of a column, and two sliding ends each vertically slidably connected to a column; When the bottom of the first scissor-type telescopic fence is aligned with the top of the second scissor-type telescopic fence, it is locked by a locking member; The locking member includes a sleeve and a ball head, the sleeve is fixedly connected to a first rotating shaft at the bottom of the first scissor-type telescopic fence, the top of the sleeve has an opening, the bottom is fixedly connected to a weight block, a slot is provided on the side of the sleeve close to the second scissor-type telescopic fence, a block is elastically provided at the junction of the slot and the opening, and a first inclined surface is provided on the side of the block away from the slot; The ball head is fixedly connected to a second rotating shaft at the top of the second scissor-type telescopic fence through an extension shaft. When the bottom of the first scissor-type telescopic fence is aligned with the top of the second scissor-type telescopic fence, the extension shaft squeezes the block to allow the ball head to enter the interior of the sleeve from the mouth of the sleeve, and then the block is reset to the junction of the slot and the opening to lock the extension shaft in the slot.

2. The outer warning fence for power maintenance according to claim 1, characterized in that: The clamping block is connected to the end surface of the opening along the circumferential sliding direction of the sleeve. An annular spring is embedded on the sleeve along the circumferential direction. One end of the annular spring is connected to the sleeve and the other end is connected to the clamping block. The elastic force acts on the clamping block in the direction of the clamping slot.

3. A peripheral warning fence for power maintenance according to claim 1 or 2, characterized in that: The clamping block has a second inclined surface on one side away from the first inclined surface.

4. A peripheral warning fence for power maintenance according to claim 1 or 2, characterized in that: The side of the block away from the first inclined surface is a horizontal surface; The first rotating shaft where the sleeve is located is horizontally rotatably connected to a rotating rod, the first rotating shaft where the sleeve is located is movably provided with a pull rope, one end of the pull rope is connected to the clamping block, and the other end is connected to the rotating rod, and the rotating rod is elastically rotatably connected to a resisting rod, which can be abutted and matched with the first rotating shaft adjacent to the bottom of the first scissor-type telescopic fence; The rotating stroke of the rotating rod has a first working position in which the clamping block is located at the clamping slot and a second working position in which the clamping block is separated from the clamping slot by a pull rope.

5. The outer warning fence for power maintenance according to claim 4, characterized in that: A torsion spring is sleeved on the rotating shafts of the rotating rod and the push rod, one end of the torsion spring is connected to the rotating rod, and the other end is connected to the push rod.

6. The outer warning fence for power maintenance according to claim 1, characterized in that: A first base fixedly connected to the ground is arranged at the bottom of one of the columns, and a roller or a second base fixedly connected to the ground is arranged at the bottom of the other column.

7. The outer warning fence for power maintenance according to claim 1, characterized in that: At least one hinged end of the first scissor-type telescopic fence and / or the second scissor-type telescopic fence is provided with a threaded knob, and the threaded knob can tightly lock the corresponding hinged end on the corresponding column during the screwing process.

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