CN104037661B - A kind of all direction multifunctional power transmission and transformation installation, repairing auxiliary device - Google Patents

Abstract

The invention discloses an all-round multifunctional power transmission and transformation installation and maintenance auxiliary device, which includes a screw-in mechanism installed on a bracket, a conveying and lifting mechanism, and a chain hoop and a working platform all installed on a utility pole; A ground anchor is installed on the output end of the feeding mechanism; the screwing mechanism is connected with the conveying and lifting mechanism through their respective connection transmission gears. The invention connects the screw-in mechanism with the conveying and lifting mechanism and installs it on the bracket at the same time. The bracket is mainly used to support the whole device; the screw-in mechanism can screw the multifunctional ground anchor into or out of the ground, There are two modes of manual and electric; the screw-in mechanism and the conveying and lifting mechanism of the present invention form an organic whole with the chain hoop installed on the utility pole and the working platform, and realize the multiple functions of conveying, lifting and screwing in , Improve work efficiency and work quality.

Description

An all-round multifunctional power transmission and transformation installation and maintenance auxiliary device

technical field

The invention belongs to the technical field of power system installation and maintenance, and in particular relates to an all-round multi-functional power transmission and transformation installation and maintenance auxiliary device.

Background technique

With the development of transmission lines and power grids, electricity consumption by residents and industrial and mining enterprises has become the primary part of power demand, and large and medium-sized power equipment such as power equipment, transmission, distribution, and transformation projects, as well as line maintenance, maintenance, etc. The demand increases, and the reliability requirements of electrical equipment in the power system are getting higher and higher. The increase in the number of operations of power equipment due to power outages and restorations may lead to negative impacts on safety production and personal injury due to long power outages and fatigue operations in power transmission engineering installations. Therefore, in order to ensure the installation and construction quality of personnel operations, it is necessary to use scientific operation modes and new construction inspection methods to ensure personal safety and equipment operation reliability, so that when the main equipment of the grid operation fails or is defective, it can be repaired in time Complementary measures to improve construction time and equipment life in operation.

In the construction of power transmission lines, there are long-distance installation and construction of new lines, installation and renovation of old lines and old equipment, and cross-stretching construction across various obstacles and manual handling operations in special areas are often encountered. construction. Due to the variety of obstacles crossed by power lines, there are various power lines, communication lines, roads, railways, houses, etc., and the crossing points are complex, which brings great safety hazards to the construction of crossing wires, and the construction site ground anchor burying work High difficulty. For example, accidents during construction may lead to long-term power outages across power lines, interruption of railway transportation, and even serious personal safety hazards. Therefore, there is an urgent need to develop a safe construction tool with conveying, lifting and precession functions, which can save manpower and labor for installation, overhaul and maintenance of various tasks in a short period of time.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide an all-round multifunctional power transmission and transformation installation and maintenance auxiliary device, which can effectively convert mechanical energy into power energy, and the construction effect is relatively standardized, ensuring the operation quality and improved work efficiency.

In order to achieve the above object, the technical solution adopted by the present invention is: including the screw-in mechanism installed on the bracket, the conveying and lifting mechanism, and the chain hoop and the working platform all installed on the utility pole; the output end of the screw-in mechanism A ground anchor is installed on the top; the power input ends of the screw-in mechanism and the conveying and lifting mechanism are connected with a motor or a rotary handle; the screw-in mechanism and the conveying and lifting mechanism are connected through their respective connection transmission gears; A wire rope winding wheel for winding a wire rope, one end of the wire rope is wound on the wire rope winding wheel, the other end is bypassed as a chain hoop as a lifting point, and the lifting object is suspended at the lower end.

The bracket includes a platform on the top for installing the screw-in mechanism and the conveying and lifting mechanism, and the bottom of the platform is provided with four supporting legs with several sections of plug-in structure, and the lower ends of the supporting legs are connected with active legs; A cross bracket is also arranged between the legs, and a suspension ring for hanging a pulley or an accessory is arranged on the cross bracket.

The screw-in mechanism includes a worm wheel installed on the bracket, and a worm that cooperates with the worm wheel to drive the worm wheel to rotate; the worm wheel is provided with a bearing for supporting the worm wheel, and the worm wheel is provided with a hexagonal wheel that matches the outer hexagonal wheel on the ground anchor. Through hole; one end of the worm is connected with a first safety coupling that disconnects power when overloaded, and the input end of the first safety coupling is connected with a motor as an automatic power source or as a rotary handle as a manual power source.

The conveying and lifting mechanism includes a wire rope winding wheel, the input end of the wire rope winding wheel is connected with the output end of the gearbox, and the input end of the gearbox is connected with a second safety coupling that cuts off the power when overloaded. The input end of the safety coupling is connected with a motor as an automatic power source or a rotary handle as a manual power source.

The end of the connecting rod at the other end of the worm is equipped with a first connection transmission gear, and the connecting rod between the first connection transmission gear and the worm is provided with a first shift fork that connects the first connection transmission gear or cuts off the power source. Coupling; the connecting rod between the output end of the gearbox and the second safety coupling is provided with a second shift fork coupling that connects or disconnects the power source of the gearbox and a normal transmission gear connected with the first Mesh the second link transfer gear.

The gear box is provided with a stop pin that prevents the wire rope winding wheel from reversing and enables the lifting object to hover at any point in the lifting stroke.

The ground anchor is a hollow structure, and the ground anchor is provided with rotating blades; the lower end and the side of the lower part of the ground anchor are respectively provided with through holes communicating with the internal cavity; the inside and outside of the top of the ground anchor are provided with threads .

The top of the ground anchor is connected with a hanging ring, and the hanging ring is connected to the internal thread on the top of the ground anchor, and a connecting hanging plate is arranged below the hanging ring; a number of hanging point bolts for connecting the bottom line and connecting with the bottom line are arranged on the connecting hanging plate. Connecting bolts that match the thread provided on the top of the ground anchor.

The upper end of the ground anchor is also connected with a ground anchor rod for increasing the working depth of the ground anchor; both ends of the ground anchor rod are provided with threads inside and outside, and the ground anchor rod is connected by a rotary blade type ground anchor connecting ring or a full threaded bolt Connect to ground anchor.

One end of the chain hoop is fixed on the hanging plate or the angle connecting plate as the hanging point, and the other end is connected with the hoop hook installed on the hanging plate or the angle connecting plate; the chain hoop is connected with the wire The part where the rods meet is covered with a rubber sleeve, the rubber sleeve is a rectangular structure, and a pair of working surfaces on the inner wall are provided with wear-resistant spring linings; the working platform is fixed on the pole through a hanging plate and a chain hoop, and the working Several hanging loops are arranged on the platform.

Compared with the prior art, the present invention has the following beneficial effects:

The invention connects the screw-in mechanism with the conveying and lifting mechanism and installs it on the bracket at the same time. The bracket is mainly used to support the whole device; the screw-in mechanism can screw the multifunctional ground anchor into or out of the ground, There are two ways of manual and electric; the conveying and lifting mechanism is mainly responsible for the hoisting and dismantling of electric equipment and hardware, rescue, etc.; the multi-functional chain hoop is mainly used to facilitate the installation of lifting points on the pole and the fixed bracket on the pole; The safety coupling protection mechanism mainly plays a protective role when the overall device is overloaded; the 24V DC motor is the power source of the overall device. The screw-in mechanism and conveying and lifting mechanism of the present invention form an organic whole with the chain hoop installed on the utility pole and the working platform, realize multiple functions of conveying, lifting and screw-in, and improve work efficiency and work quality.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the overall structure schematic diagram of support of the present invention;

Fig. 3 is a side view of the screw-in mechanism of the present invention;

Fig. 4 is the top view of screw-in mechanism and conveying and lifting mechanism of the present invention;

Fig. 5 is the structural representation of ground anchor of the present invention;

Fig. 6 is a structural schematic diagram of the rotary vane and the through hole at the bottom of the ground anchor of the present invention;

Fig. 7 is the structural representation of ground anchor rod of the present invention;

Fig. 8 is a schematic diagram of the connection relationship between the ground anchor rod and the ground anchor of the present invention;

Fig. 9 is a structural schematic diagram of the rotary vane ground anchor connecting ring of the present invention;

Fig. 10 is a structural schematic diagram of the connection hanging plate of the present invention;

Fig. 11 is a schematic diagram of the connection relationship between the chain hoop and the hanging plate of the present invention;

Fig. 12 is a schematic structural view of the hoop hook of the present invention;

Fig. 13 is a schematic structural view of the rubber sleeve of the present invention;

Fig. 14 is a schematic diagram of the connection relationship between the chain hoop and the angle connecting lever of the present invention;

Fig. 15 is a schematic structural view of the working platform of the present invention;

Fig. 16 is a front view of the chain hoop of the present invention;

Fig. 17 is a top view of the chain hoop of the present invention.

Among them, 1 is the bracket; 2 is the ground anchor; 3 is the chain hoop; 4 is the working platform; 5 is the lifting object; 6 is the platform; 7 is the supporting leg; Ring; 11 is the worm wheel; 12 is the worm; 13 is the bearing; 14 is the first safety coupling; 15 is the wire rope winding wheel; 16 is the gear box; 17 is the second safety coupling; 18 is the first connection transfer gear ; 19 is the first fork type coupling; 20 is the second fork type coupling; 21 is the second connection transmission gear; 22 is a stop pin; 23 is a rotary blade; 24 is a through hole; 25 is a hanging ring; 26 is the connection hanging plate; 27 is the hanging point bolt; 28 is the connecting bolt; 29 is the ground anchor rod; 30 is the rotary blade type ground anchor connecting ring; Pull; 34 is a hoop hook; 35 is a rubber sleeve; 36 is a wear-resistant spring liner.

detailed description

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Referring to Fig. 1, the present invention includes the screw-in mechanism installed on the support 1, the conveying and lifting mechanism, and the chain hoop 3 and the working platform 4 all installed on the utility pole; the output end of the screw-in mechanism is equipped with a ground anchor 2. The power input ends of the screwing mechanism and the conveying and lifting mechanism are connected with a motor or a rotary handle; the screwing mechanism is connected with the conveying and lifting mechanism through their respective connection transmission gears; the conveying and lifting mechanism is provided with a wire rope for winding the wire rope Winding wheel 15, one end of wire rope is wound on the wire rope winding wheel 15, and the other end walks around as hanging point chain hoop 3, and the lower end hangs lifting object 5. One end of the chain hoop 3 is fixed on the hanging plate 32 or the angle connecting lever 33 as the hanging point, and the other end is connected with the hoop hook 34 installed on the hanging plate 32 or the angle connecting lever 33; the chain hoop 3, the part that connects with the pole is provided with a rubber sleeve 35, the rubber sleeve 35 is a rectangular structure, and a pair of working surfaces on the inner wall are provided with a wear-resistant spring liner 36; the working platform 4 is held by the hanging plate 32 and the chain The hoop 3 is fixed on the utility pole, and the working platform 4 is provided with several hanging rings.

The ground anchor 2 is a hollow structure, and the ground anchor 2 is provided with a rotary vane 23; the lower end and the side of the lower part of the ground anchor 2 are respectively provided with through holes 24 communicating with the internal cavity; the inside and outside of the top of the ground anchor 2 are both Open with thread. The top of ground anchor 2 is connected with hanging ring 25, and hanging ring 25 is connected on the internal thread of ground anchor 2 top, and the bottom of hanging ring 25 is provided with connecting hanging plate 26; Hanging point bolts 27 and connecting bolts 28 matched with the threads provided on the top of the ground anchor 2 . The upper end of ground anchor 2 is also connected with the ground anchor rod 29 that is used to increase the working depth of ground anchor 2; The full threaded bolt 31 links to each other with the ground anchor 2.

The support includes a platform 6 at the top for installing the screw-in mechanism and the conveying and lifting mechanism. The bottom of the platform 6 is provided with four supporting legs 7 of a plurality of plug-in structures, and the lower ends of the supporting legs 7 are connected with active legs and feet 8; wherein, two A horizontal bracket 9 is also arranged between the two supporting legs 7, and a suspension ring 10 for hanging a pulley or an accessory is arranged on the horizontal bracket 9. The precession mechanism includes a worm wheel 11 installed on the bracket 1, and a worm 12 that cooperates with the worm wheel 11 to drive the worm wheel 11 to rotate; The hexagonal through hole matched with the outer hexagon; one end of the worm 12 is connected with a first safety coupling 14 that disconnects the power when overloaded, and the input end of the first safety coupling 14 is connected with a motor as an automatic power source or Rotary handle as manual power source. The conveying and lifting mechanism includes a wire rope winding wheel 15, the input end of the wire rope winding wheel 15 is connected with the output end of the gear box 16, and the input end of the gear box 16 is connected with a second safety coupling 17 that disconnects power when overloaded, The input end of the second safety coupling 17 is connected with a motor as an automatic power source or as a rotary handle as a manual power source. The end of the connecting rod at the other end of the worm screw 12 is equipped with a first connection transmission gear 18, and the connecting rod between the first connection transmission gear 18 and the worm screw 12 is provided with a first connection transmission gear 18 that connects or cuts off the power source. Fork coupling 19; the connecting rod between the output end of the gearbox 16 and the second safety coupling 17 is sequentially provided with a second fork coupling 20 for connecting or disconnecting the power source to the gearbox 16 And the second connection transmission gear 21 that is constantly meshed with the first connection transmission gear 18 . The gear box 16 is provided with a stop pin 22 that prevents the wire rope winding wheel 15 from reversing and enables the lifting object to hover at any point in the lifting stroke.

Principle of the present invention:

Referring to Fig. 1, the present invention consists of support 1, ground anchor 2, screw-in mechanism, conveying and lifting mechanism, DC motor (24V), steel ball type torsion limiter (the first safety coupling 14 and the second safety coupling 17), the rotating handle constitutes. When the DC motor (24V) drives the worm of the screw-in mechanism to rotate, the worm drives the worm gear to rotate to drive the multifunctional ground anchor to rotate, and the multifunctional ground anchor is screwed into the automatic soil under the action of its own revolving blades. When the device encounters greater resistance, the first shaft coupling 14 starts and disconnects the DC motor (24V), the device stops working, and the protection device is not damaged. When the DC motor (24V) is replaced by a rotary handle, ground can be realized The anchor is screwed in manually. When the worm rotates, the conveying and lifting mechanisms are simultaneously driven to work by connecting the transmission gear set. In addition, when the DC motor (24V) is changed to the driving position, it is switched to the input end of the conveying and lifting mechanism, and the screwing mechanism and the conveying and lifting mechanism can also be realized by connecting the transmission gear set. The position of the fork coupling enables the two mechanisms to work simultaneously or independently, and can also be operated manually. There is also a steel ball torque limiter (safety coupling) on the shaft at the input end of the conveying and lifting mechanism to protect the entire device.

In order to expand the working field of the device, there are also two mechanisms, a multi-functional chain hoop and a working platform on the pole, which are convenient for arranging lifting points and a safe operation platform for the pole. The overall mechanism has good reliability, operability and stability, and the application range is very wide.

As shown in Figure 2, the function of the platform 6 of the present invention is to install the overall device. The support leg 7 adopts a three-section plug-in structure as a whole, and is fixed horizontally with bolts. The purpose is to facilitate the use of high and low legs in special areas and obtain maximum support. Force (utilize inclined-plane self-locking principle); Active legs and feet 8 can make support firm, link to each other with support leg by screw thread; Horizontal support 9 but support integral body is firm; Suspension ring 10 effects can hang pulley and other annexes.

As shown in Fig. 3 and Fig. 4, the function of the turbine 11 of the present invention is power output, which drives the ground anchor 2 to rotate, so that the ground anchor 2 is screwed in and out; the function of the worm 12 is to drive the turbine 11 to rotate; the first fork type coupling The function of the shaft device 19 is to make the first connection transmission gear 18 connect or cut off the power source; the first connection transmission gear 18 is used to connect the conveying and lifting mechanism; the main function of the first safety coupling 14 is to disconnect when the overall device is overloaded. If the power is turned on, the protection device will not be damaged; the role of the bearing 13 is to support the turbine 11; the role of the 24V motor is to realize the automatic power source of the whole device, and the design can be controlled by remote control; the rotating handle is the manual power source of the whole device. Both the first safety coupling 14 and the second safety coupling 17 are steel ball torque limiters.

As shown in Figure 4, the role of the gearbox 16 of the present invention is to obtain a suitable rotating speed for the wire rope winding wheel 15; the stop pin 22 prevents the reverse rotation of the wire rope winding wheel 15, and can make the object hover at any point; the second shift fork The function of the type coupling 20 is to connect or cut off the power source of the gearbox 16; the main function of the second safety coupling 17 is to disconnect the power when the overall device is overloaded, so as to ensure that the device is not damaged; the function of the 24V motor is to realize the overall device The automatic power source is designed to be controlled by remote control; the rotary handle is the manual power source of the overall device; the wire rope winding wheel 15 is used to wind the wire rope.

As shown in Fig. 5 to Fig. 10, the ground anchor 2 of the present invention is a spin-type ground anchor, and the spin-type ground anchor has a rotating blade 23 by itself, and the ground anchor 2 is under the action of the rotating blade 23 when the force rotates Automatically screw in, the ground anchor 2 itself is hollow, and the lower end is provided with a through hole 24 communicating with it, which is convenient for the liquid to flow out to lubricate the ground anchor 2, and the upper end of the ground anchor 2 is provided with threads inside and outside for connecting other objects; 29 is the extension rod of ground anchor 2, can make ground anchor 2 reach ideal working depth, and both ends are provided with screw thread inside and outside, and it can be connected with self-spinning ground anchor with full threaded bolt 31, fixes with jackscrew after connection, also It can be connected with the rotary blade type ground anchor connecting ring 30, which can increase the spin force of the ground anchor 2 and make the screwing in more stable; the connecting hanging plate 26 is designed to hang the ground wire, which can realize the simultaneous connection of multiple ground wires. Connecting bolt 28 between and self-rotating ground anchor and ground anchor bar 29 are provided with thread matching; Hanging ring 25 connects it after ground anchor is screwed in, can bind rope buckle, hang pulley usefulness.

As shown in Figures 11 to 17, the chain hoop 3 of the present invention is designed to cooperate with the conveying and lifting mechanism. Wrench 33 is connected and used, and the angle connecting wrench 33 is provided with a hook hole, and can also be used in connection with the hanging plate 32. By turning the nut of the chain hoop hook to tighten the chain, a suspension point is arranged on the electric pole, and for protecting the electric pole The multifunctional chain hoop is provided with a wear-resistant rubber sleeve 35, which is a rectangular structure, and a pair of working surfaces on the inner wall are designed with wear-resistant spring liners to improve the durability of use; in order to further improve the working range of the conveying and lifting mechanism , also be provided with work platform 4 on the bar for it, be fixed on the bar with hanging plate 32 and multifunctional chain hoop, the work platform 4 on the bar is provided with a plurality of hanging rings, convenient work uses.

The present invention also has the following advantages:

Lay the foundation for power grid construction and safe operation of equipment, and ensure the reliable operation and stability of transmission lines. This device regulates and solves the safety of staff in special areas, reasonable operability, timeliness of operation quality and scientific operation professionalism. The tool saves time and labor during installation, overhaul, maintenance, emergency rescue and rescue work. It can significantly improve work efficiency while reducing the work intensity of operators, and has many functions. It can improve the reliability of power grid operation, reduce the labor intensity of staff, and improve the economic benefits of safe production and income generation. The invention relates to a multi-in-one combination structure of new-type conveying, three-dimensional lifting, temporary grounding device and screw-in device, especially relates to the structure of a new type of multi-functional conveying, lifting and screw-in mechanism for electric power construction, installation, maintenance, safety rescue, etc.

The above content is only to illustrate the technical ideas of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solutions according to the technical ideas proposed in the present invention shall fall within the scope of the claims of the present invention. within the scope of protection.

Claims (7)

1. an all direction multifunctional power transmission and transformation installation, repairing auxiliary device, it is characterised in that: include being installed on Precession mechanism, conveying and hoisting mechanism on support (1) and the chain anchor ear (3) being mounted on electric pole With work platforms (4)；Earth anchor (2) is installed on the outfan of precession mechanism；Precession mechanism and conveying and lifting The power intake of mechanism is respectively connected with motor or rotary handle；Precession mechanism passes through each with conveying and hoisting mechanism From connection transmission gear be connected；It is provided with the wirerope-winding for lay winding wire ropes in conveying and hoisting mechanism Wheel (15), the one ends wound of steel wire rope is on wirerope-winding wheel (15), and the other end is walked around as suspension centre chain type Anchor ear (3), lower end hangs and promotes object (5)；

Described precession mechanism includes the worm gear (11) being installed on support (1), and with worm gear (11) phase Coordinate the worm screw (12) driving worm gear (11) to rotate；It is provided with in worm gear (11) for supporting worm gear (11) Bearing (13), worm gear (11) offers the six square tube holes mated with the outer hexagonal phase on earth anchor (2)； One end of worm screw (12) connects the first safety coupling (14) disconnecting power when overload, and first joins safely The motor as automatic power source or the rotary handle as manual power source is connected on the input of axial organ (14)；

Described conveying and hoisting mechanism include that wirerope-winding takes turns (15), the input of wirerope-winding wheel (15) End is connected with the outfan of gear-box (16), the input of gear-box (16) connects and has the disconnection when overload Second safety coupling (17) of power, the input of the second safety coupling (17) connects as the most dynamic The motor in power source or the rotary handle as manual power source；

The end of described worm screw (12) other end connecting rod is provided with the first connection transmission gear (18), and first connects It is provided with on connecting rod between transmission gear (18) and worm screw (12) and makes first to be connected transmission gear (18) even Connect or cut off the first fork type shaft coupling (19) of power source；Gear-box (16) outfan and the second safe shaft coupling It is disposed with on connecting rod between device (17) and makes gear-box (16) connect or disconnect the second shift fork of power source Formula shaft coupling (20) and be connected the second connection transmission gear (21) of transmission gear (18) often engagement with first.

All direction multifunctional power transmission and transformation installation the most according to claim 1, repairing auxiliary device, its feature Be: described support (1) include top for installing precession mechanism and conveying and the platform (6) of hoisting mechanism, The bottom of platform (6) is provided with four supporting legs (7) of some joint connected structures, the lower end of supporting leg (7) Connect and have active legs and feet (8)；Wherein, it is additionally provided with lateral frame (9), lateral frame between supporting leg (7) two-by-two (9) hanging ring (10) for hanging pulley or adnexa it is provided with on.

All direction multifunctional power transmission and transformation installation the most according to claim 1, repairing auxiliary device, its feature It is: be provided with in described gear-box (16) and prevent wirerope-winding wheel (15) from reversing, and make lifting thing Body can hover over the latch (22) of any point in lift stroke.

All direction multifunctional power transmission and transformation installation the most according to claim 1, repairing auxiliary device, its feature It is: described earth anchor (2) is hollow structure, and is provided with vane (23) on earth anchor (2)；Earth anchor (2) Lower end and the side of bottom offer the through hole (24) communicated with internal cavity respectively；The top of earth anchor (2) Inside and outside all offer screw thread.

All direction multifunctional power transmission and transformation installation the most according to claim 4, repairing auxiliary device, its feature It is: the top of described earth anchor (2) connects has link (25), link (25) to be connected to earth anchor (2) top Female thread on, the lower section of link (25) be provided with connection link plate (26)；Connect and be provided with on link plate (26) Some hanging point bolts (27) for connecting bottom line and with earth anchor (2) top set by the connection that matches of screw thread Bolt (28).

All direction multifunctional power transmission and transformation installation the most according to claim 4, repairing auxiliary device, its feature It is: the upper end of described earth anchor (2) is also associated with the ground anchor pole (29) for increasing earth anchor (2) working depth； The inside and outside screw thread that all offers at anchor pole (29) two ends, ground, and ground anchor pole (29) is by Spiralism type earth anchor Connect ring (30) or full screw thread bolt (31) is connected with earth anchor (2).

All direction multifunctional power transmission and transformation installation the most according to claim 1, repairing auxiliary device, its feature It is: one end of described chain anchor ear (3) is fixed on the link plate (32) as suspension centre or bent angle wins (33) in succession On, the other end is connected with anchor ear hook (34) being arranged on link plate (32) or bent angle is won in succession on (33)；Chain Upper and electric pole joint the part of formula anchor ear (3) is arranged with rubber sleeve (35), and rubber sleeve (35) is rectangle Structure, a pair work surface of its inwall is provided with wear-resisting spring liner plate (36)；Work platforms (4) passes through link plate (32) Fix on utility poles with chain anchor ear (3), and be provided with some links on work platforms (4).