CN219061482U - Novel bending-resistant insulating ladder - Google Patents

Abstract

The utility model relates to the technical field of electric power overhaul tools, in particular to a novel bending-resistant insulating ladder, which comprises at least two ladder sections, wherein the ladder sections are mutually spliced in the longitudinal direction; the lower end of the ladder section positioned at the lower part is provided with a hook, and the hook is provided with an opening part and a locking structure; the locking structure is arranged on the hook through a rotating shaft and a bearing arranged on the rotating shaft and is used for sealing the opening part; the bearing has switchable forward reverse and reverse forward modes. The insulating ladder provided by the utility model has a locking function, and can effectively improve the use safety of the insulating ladder.

Description

Novel bending-resistant insulating ladder

Technical Field

The utility model relates to the technical field of electric power overhaul tools, in particular to a novel bending-resistant insulating ladder.

Background

With the rapid development of the power grid, more and more overhaul and maintenance operations are required for constructing a strong power grid. The equipotential operation mode in the live line maintenance operation is the most direct and effective, and the insulating ladder is the most common in the equipotential operation of the 110-220 kV transmission line due to the characteristics of convenience and comfort. The existing insulating ladder for entering and exiting electric fields has poor bending resistance, the ladder body is easy to wear, and the lack of an automatic locking function of the ladder head hook is not solved effectively.

In the prior art, the bending resistance of the insulating ladder is enhanced by increasing the thickness of the insulating ladder pipe and additionally arranging the insulating rope in the middle of the ladder body, but the increase of the thickness of the pipe necessarily leads to the increase of the self weight of the ladder body, and the improvement of the bending resistance of the insulating ladder is not obviously improved.

In the prior art, the lifting method of the insulating rope is additionally arranged in the middle of the ladder body, so that the connecting part of the insulating ladder section and the section can be frequently bent forward and backward, and fatigue damage and abrasion of the connecting part are aggravated.

In the prior art, the whole insulating ladder is adopted without segmentation, and the bending resistance can be increased to a certain extent, but the length is not adjustable, so that the transportation, the carrying and the storage are inconvenient.

In the prior art, the friction between the ladder body and the tower material is reduced by winding cloth strips at the tail end of the insulating ladder and installing the protection pad, the method is troublesome to implement, the used materials are mostly non-insulating materials and are easy to consume, and the method is not adopted and applied in the actual overhaul operation process.

The ladder head hook of the existing insulating ladder has no automatic locking function, the head end of the erected insulating ladder is directly hung on a wire or other connecting fittings through the open ladder head hook, the connecting part is in unreliable connection, and the risk of disconnection of the ladder head hook caused by external force factors and improper operation exists.

Disclosure of Invention

In order to overcome the defects in the prior art, the technical problems to be solved by the utility model are as follows: the novel bending-resistant insulating ladder has the advantages of locking function, strong bending resistance and excellent wear resistance.

In order to solve the technical problems, the utility model adopts the following technical scheme: the novel bending-resistant insulating ladder comprises at least two ladder sections, wherein the ladder sections are mutually spliced in the longitudinal direction;

the lower end of the ladder section positioned at the lower part is provided with a hook, and the hook is provided with an opening part and a locking structure;

the locking structure is arranged on the hook through a rotating shaft and a bearing arranged on the rotating shaft and is used for sealing the opening part;

the bearing has switchable forward reverse and reverse forward modes.

The locking structure comprises at least three swing rods which are distributed on the side face of the bearing at equal intervals in circumference, and the swing rods rotate to the opening part around the axis of the rotating shaft to close the opening part.

Wherein, the bench includes two terraces that the interval set up and sets up two at least one ladder knot between the terraces, rubber sheath has been cup jointed on the terraces.

The rubber sheath is of a hollow structure, one side of the rubber sheath is provided with a notch for the ladder body to enter the inner cavity of the rubber sheath, at least one side part forming the notch is provided with a notch, and at least one ladder knot is clamped in the notch.

The support hardware fitting is arranged at the joint of at least one adjacent ladder section in a mutually spliced manner, and is provided with a connecting end far away from the ladder section;

sleeves are respectively arranged on the ladder sections on two sides of the support fitting, and an insulating pull rod is arranged between the sleeves and the connecting ends. The triangular bending-resistant stable supporting structure greatly improves the bending resistance of the insulating ladder.

The utility model has the beneficial effects that: according to the novel bending-resistant insulating ladder provided by the utility model, the hooks with the locking structures are arranged, so that the safety of personnel in the operation process is greatly improved.

Drawings

FIG. 1 is a front view of an insulating ladder according to the present utility model in a specific embodiment;

FIG. 2 is a side view of an insulating ladder according to the present utility model in an embodiment;

fig. 3 is a schematic view showing the structure of an insulating ladder in the embodiment of the present utility model;

FIG. 4 is a horizontal cross-sectional view of a rubber boot in accordance with an embodiment of the present utility model;

figure 5 is a side cross-sectional view of a rubber boot in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic view of a latch structure according to an embodiment of the present utility model;

fig. 7 is a schematic structural view of another locking structure according to the present utility model in the embodiment.

Description of the reference numerals: 1. a bench; 11. a ladder body; 12. a ladder knot; 2. a rubber sheath; 21. a notch; 22. an inner cavity; 23. a side portion; 24. a notch; 3. supporting hardware fittings; 31. a connection end; 4. an insulating pull rod; 5. a sleeve; 6. a hook; 61. an opening portion; 62. a locking structure; 621. a swing rod a; 622. a swing rod b; 623. a swing rod c; 624. and a swing rod d.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 7, a novel bending-resistant insulating ladder comprises at least two ladder sections 1, wherein the ladder sections 1 are mutually spliced in the longitudinal direction; the lower end of the lower ladder section 1 is provided with a hook 6, and the hook 6 is provided with an opening part 61 and a locking structure 62; the locking structure 62 is arranged on the hook 6 through a rotating shaft and a bearing arranged on the rotating shaft and is used for closing the opening 61; the bearing has switchable forward reverse and reverse forward modes.

The length of the ladder section 1 is flexible and changeable, for example, the whole length of the insulating ladder is 6m, and the insulating ladder can be formed by mutually splicing three ladder sections 1 with the lengths of 2.5m,2.5m and 1.0m respectively, so that the insulating ladder is convenient to transport and store, and is suitable for the principle that the length of the insulating ladder is flexible and changeable in overhaul operation. The combination between the ladder sections 1 is arbitrary, i.e. in the three ladder section 1 embodiments, three sections or any two sections can be combined, i.e. three insulating ladders with different lengths of 3.5m, 5m and 6m can be obtained. Therefore, the insulating ladder with corresponding length can be flexibly selected according to different voltage classes or different tower types, and the length redundancy and the inconvenience brought by the length redundancy in the process of erecting the insulating ladder are avoided.

Adjacent ladder sections 1 are mutually spliced in the longitudinal direction. In one embodiment, the adjacent ladder sections 1 are connected longitudinally through aluminum alloy sleeves arranged at the ends of the adjacent ladder sections, and each aluminum alloy sleeve is connected hard by means of four equidistant transverse through bolts. In order to increase the effective insulation length of the insulation ladder, the length of the aluminum alloy sleeve is preferably 25cm.

The hook 6 is provided at the lower end of the lower bench 1, in fact the lowest bench 1. The number of the hooks 6 is at least one. In one embodiment, the hooks 6 are mounted on the bench 1 by means of a substantially triangular mounting frame. The opening 61 is an opening into which the wire is inserted, and the locking structure 62 is used to restrict the wire from coming out through the opening 61 in the operating state. The bearing is of an existing structure, such as a bidirectional quick ratchet socket wrench bearing structure, and is provided with a pull ring or a pulling piece for forward and reverse conversion, such as a ratchet related component in a bidirectional ratchet wrench disclosed in patent CN 108098658A. Wherein, the forward rotation non-return mainly means that the bearing allows forward rotation but limits reverse rotation, and the reverse rotation non-return mainly means that the bearing rotates reversely but limits forward rotation. This switching of the operation mode is necessary to effectively ensure the installation and removal of the insulating ladder. The switching mode can be indirectly operated through an insulating operation rod or can be switched before an equipotential person exits from an electric field, and the mode switching mode can be realized through a transposition pull ring or a pulling piece and the like.

In one embodiment, the locking structure 62 includes at least three swing rods circumferentially equally spaced around the bearing side, and the swing rods rotate about the shaft axis onto the opening 61 to close the opening 61. The length of the swing rod is determined by the fact that the opening 61 of the hook 6 can be just closed from the axial point of the swing rod to the opening 61. Specifically, when the number of the swing rods is 3, see fig. 6, the swing rods a621, b622 and c623 are included, and the included angles between them are 120 °. The three swinging rods can rotate around the rotating shaft. When the normal rotation non-return mode is the installation mode, the hook 6 is close to the wire, the swing rod a621 guides the wire to enter the opening 61, and when the wire enters the hook 6, the swing rod b622 closes the opening 61, namely, the locking of the hook 6 is realized, so that the wire is prevented from falling out of the hook 6. When the use is completed, the reverse positive stop mode is switched, at the moment, the wire pushes the swing rod b622 to rotate reversely, the swing rod a621 rotates along with the swing rod b622, and when the wire is separated from the hook 6, the swing rod a621 closes the opening 61, and at the moment, the wire cannot enter the hook 6 any more.

When the number of the swing links is 4, see fig. 7, including swing link a621, swing link b622, swing link c623 and swing link d624. When a wire enters the hook 6, a forward rotation non-return mode is adopted, namely the swing rod a621 reaches the position of the swing rod c623, the swing rod d624 reaches the position of the swing rod b622, and at the moment, the swing rod d624 realizes the closing of the opening 61, namely the wire cannot be separated from the hook 6, so that the hook 6 is locked. When the wire is pulled out of the hook 6, a reverse normal stop mode is adopted, namely the swing rod d624 guides the wire, the swing rod d624 returns to the position of the swing rod b622, the swing rod c623 returns to the position of the swing rod a621, and the swing rod b622 seals the opening 61 to prevent the wire from entering the hook 6.

In one embodiment, the forward rotation is clockwise rotation and the reverse rotation is counterclockwise rotation.

Wherein the wires may be replaced with other hardware, primarily selected based on the installation environment.

In one embodiment, the ladder section 1 includes two ladder shafts 11 arranged at intervals and at least one ladder knot 12 arranged between the two ladder shafts 11, and the rubber sheath 2 is sleeved on the ladder shafts 11. The rubber sheath 2 can be arranged at any position of the ladder body 11, and has the function of preventing mutual extrusion abrasion and breakage between the insulating ladder and the tower material, thereby prolonging the service life of the insulating ladder and reducing the cost.

Wherein the rubber sheath 2 is a hollow structure, one side of the hollow structure is provided with a notch 21 for the ladder body 11 to enter the inner cavity 22 of the rubber sheath 2, at least one side 23 forming the notch 21 is provided with a notch 24, and at least one ladder knot 12 is clamped in the notch 24.

Referring to fig. 4, the rubber sheath 2 is generally U-shaped in cross section, and has a notch 21 on one side for wrapping the ladder 11. The rubber sheath 2 should have hoop capability, so the inner cavity 22 should be adapted to the shape of the ladder body 11, preferably the inner diameter (width) of the protective rubber sheath is slightly larger than the outer diameter (width) of the ladder body 11, so as to ensure tight connection of the two. At the edge of at least one of the side portions 23 forming the two sides 23 of the notch 21, a recess 24 is provided, the diameter of which recess should be equal to the diameter of the ladder knot 12 (when the ladder knot 12 is cylindrical), i.e. when the rubber jacket 2 is fitted over the ladder body 11, it should be preferred that at least one ladder knot 12 is caught by the recess 24, so that a longitudinal movement of the rubber jacket 2 is prevented. The rubber sheath 2 should have high elasticity so as to ensure the recovery of the self-shape after repeated breaking-in, and the capability of picking up the tightly attached hoop due to self-deformation after long-term use is avoided. Meanwhile, the abrasion resistance of the insulating ladder ensures that the rubber sheath 2 is extruded and rubbed between the insulating ladder and the tower material so as not to be easy to damage. While its insulation properties maintain the effective insulation length of the insulation ladder. Through adopting this kind of rubber sheath 2 design, its easy dismounting, the position is adjustable wantonly, can greatly save the protection process that additionally increases the insulating ladder wearing and tearing, realizes the reliable wear-resisting protection of insulating ladder.

Because the bending resistance of the existing reinforced insulating ladder material is enhanced at an angle, or the rigid connection between the reinforced insulating ladder sections 1 cannot be well improved in actual detection, the inventor proposes a triangular bending-resistant stable structural design, namely, a supporting hardware fitting 3 is arranged at the joint of at least one adjacent ladder sections 1, and the supporting hardware fitting 3 is provided with a connecting end 31 far away from the ladder sections 1; sleeve pipes 5 are respectively arranged on the ladder sections 1 positioned on the two sides of the support fitting 3, an insulating pull rod is arranged between the sleeve pipes 5 and the connecting ends 31, and adjusting bolts for looseness of the insulating pull rod are arranged at the sleeve pipes 5. Wherein, the supporting hardware fitting 3 is arranged at the connection part between the adjacent ladder sections 1, namely at the lowest point of bending of the insulating ladder when bearing personnel load, and at the moment, the two insulating pull rods 4 are respectively connected with the sleeves 5 arranged at the two sides of the supporting hardware fitting 3, namely, a triangular structure of three sides of the insulating pull rods 4, the insulating ladder and the supporting hardware fitting 3 is formed. In the structural design, the load which is vertical to the insulating ladder can be transversely dispersed to the insulating ladder, so that the bending generated by the insulating ladder under the vertical load is weakened, the stability of the triangular structure can be enhanced through the adjusting bolts for adjusting the looseness of the insulating pull rod at the sleeve 5, and the bending resistance is enhanced. Specifically, the sleeves 5 are disposed on different ladder sections 1 and are connected to the connection ends 31 of the support fittings 3 through insulating tie rods 4. In one embodiment, the main body of the support fitting 3 has an inverted V shape, and a cross bar is provided at a top corner thereof to form connection ends 31 respectively connected to the insulation tie bars 4 at both sides. Although the structure changes the appearance structure of the insulating ladder, namely, the erection is possibly hindered in the process of certain overhaul operation, the connectivity between the adjacent ladder sections 1 is enhanced to a certain extent, and the safety coefficient and the bending resistance of the insulating ladder are improved.

Example 1

The novel bending-resistant insulating ladder comprises at least two ladder sections 1, wherein the ladder sections 1 are mutually spliced in the longitudinal direction; the lower end of the lower ladder section 1 is provided with a hook 6, and the hook 6 is provided with an opening part 61 and a locking structure 62; the locking structure 62 is arranged on the hook 6 through a rotating shaft and a bearing arranged on the rotating shaft and is used for closing the opening 61; the bearing has switchable forward reverse and reverse forward modes.

Wherein the locking structure 62 comprises at least three swing rods which are circumferentially and equidistantly distributed on the side surface of the bearing, and the swing rods rotate around the axis of the rotating shaft to the opening part 61 so as to close the opening part 61;

the bench 1 comprises two ladder bodies 11 arranged at intervals and at least one ladder knot 12 arranged between the two ladder bodies 11, and the two ladder bodies 11 are sleeved with a rubber sheath 2.

The rubber sheath 2 is of a hollow structure, one side of the rubber sheath is provided with a notch 21 for the ladder body 11 to enter the inner cavity 22 of the rubber sheath 2, at least one side 23 forming the notch 21 is provided with a notch 24, and at least one ladder knot 12 is clamped in the notch 24;

at least one joint of adjacent ladder sections 1 spliced with each other is provided with a support fitting 3, and the support fitting 3 is provided with a connecting end 31 far away from the ladder sections 1;

the bench 1 on two sides of the support fitting 3 is respectively provided with a sleeve 5, an insulating pull rod 4 is arranged between the sleeve 5 and the connecting end 31, and an adjusting bolt for adjusting the looseness of the insulating pull rod 4 is arranged at the sleeve.

Specifically, after at least two ladder sections 1 are longitudinally spliced, hooks 6 are installed at the bottoms of the insulating ladder, supporting hardware fittings 3 are installed at the joints between adjacent ladder sections 1, sleeves 5 are installed on different ladder sections 1 and connected with the connecting ends 31 of the supporting hardware fittings 3 through insulating pull rods 4, rubber sheaths 2 are installed at required positions, and the insulating ladder is assembled. At this time, the wire is fed into the hook 6 in a normal rotation non-return mode and the opening end of the hook 6 is closed by the swing rod to prevent the wire from falling out of the hook 6. When the wire needs to be disassembled, the wire is sent out of the hook 6 in a reverse normal stop mode, and the opening end of the hook 6 is closed by the swing rod to prevent the wire from reentering the hook 6. In the actual test, the physical properties of the conventional insulating ladder and the insulating ladder of the present utility model were compared, and the results are shown in table 1.

TABLE 1

It can be seen from table 1 that the insulation ladder provided by the utility model can effectively reduce the maximum deflection under the conditions of same working load, safety coefficient, impact coefficient and test load as the existing insulation ladder.

In conclusion, the bending resistance of the novel bending-resistant insulating ladder can be improved by 80% by using the triangular bending-resistant stable structural design; the rubber sheath is adopted as a wear-resistant structure, so that the friction loss of the insulating ladder can be effectively avoided, and the service life of the tool is greatly prolonged; the hook with the locking structure is simple and reliable in structure, and the safety of workers in the operation process is greatly improved.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims (5)

1. The novel bending-resistant insulating ladder is characterized by comprising at least two ladder sections, wherein the ladder sections are mutually spliced in the longitudinal direction;

the lower end of the ladder section positioned at the lower part is provided with a hook, and the hook is provided with an opening part and a locking structure;

the locking structure is arranged on the hook through a rotating shaft and a bearing arranged on the rotating shaft and is used for sealing the opening part;

the bearing has switchable forward reverse and reverse forward modes.

2. The novel bending-resistant insulating ladder according to claim 1, wherein the locking structure comprises at least three swing rods which are circumferentially equidistantly distributed on the side surface of the bearing, and the swing rods rotate around the axis of the rotating shaft to the opening portion to close the opening portion.

3. The novel bending-resistant insulating ladder of claim 1, wherein the ladder section comprises two ladder bodies arranged at intervals and at least one ladder knot arranged between the two ladder bodies, and the ladder bodies are sleeved with rubber jackets.

4. The novel bending-resistant insulating ladder of claim 3, wherein the rubber sheath is hollow, one side of the rubber sheath is provided with a notch for the ladder body to enter the inner cavity of the rubber sheath, at least one side part forming the notch is provided with a notch, and at least one ladder knot is clamped in the notch.

5. The novel bending-resistant insulating ladder according to claim 1, wherein a supporting fitting is arranged at a joint where at least one adjacent ladder sections are spliced with each other, and the supporting fitting is provided with a connecting end far away from the ladder sections;

the bench on two sides of the support fitting is respectively provided with a sleeve, an insulating pull rod is arranged between the sleeve and the connecting end, and an adjusting bolt for adjusting looseness of the insulating pull rod is arranged at the sleeve.

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