RU2693612C1 - Device for combined fire extinguishing and fire-and-explosion prevention of foam of low and medium multiplicity - Google Patents

Abstract

FIELD: fire safety.

SUBSTANCE: invention relates to fire extinguishing equipment and fire-and-explosion prevention, namely, to devices for combined extinguishing of large-scale fires of classes A and B and for fire-and-explosion prevention air-mechanical combined foam of low and medium ratio. To increase fire extinguishing efficiency and explosion and fire prevention due to increased range and uniform distribution of foam medium and low multiplicity by area of fire and increased safety of fire extinguishing process and fire-and-explosion prevention on especially fire and explosion hazardous facilities, device for combined fire extinguishing and fire-and-explosion prevention foam of low and medium ratio comprises two fixed on the crossarm generator combination foam of low and medium multiplicity, comprising housing with installed inside housing packet of foam generation medium multiplicity, located in front of housing unit of nozzles supplying aqueous solution foaming agent on packet of meshes of generation of foam average ratio, low-expansion foam formation barrel, a foaming agent water solution supply duct to the nozzles and the low-ratio foam formation barrel and the foam generator connection device to the foaming agent aqueous solution pressure line, facility for automated turns of crossarm with foam generators fixed on it in vertical and horizontal planes.

EFFECT: higher efficiency of fire extinguishing and fire and explosion prevention.

15 cl, 2 tbl, 7 dwg

Description

Technical field

The invention relates to fire fighting and fire prevention equipment, namely, devices for extinguishing fires of classes A and B and for fire and explosion prevention by air and mechanical combined foam of low and medium multiplicity and can be used for the rapid formation and uniform distribution of the combined foam of low and medium multiplicity over large areas fires of flammable liquids, solid flammable materials and bottling of liquefied hydrocarbon and natural gases (LPG and LNG), where fire ignition required operational fire extinguishing agent of the entire fire hazard area, and can also be used for cooling and / or fire protection of buildings, structures, equipment, equipment, combustible and explosive materials.

The level of technology

Known mobile and portable fire extinguishing agents.

Known motor pump for extinguishing a fire, containing a pump with a drive engine, an engine control unit and a hose line, the pressure hose of which has a barrel-sprayer and a connector for connecting the hose to the pump, characterized in that a switch is connected to the barrel-sprayer connected by a connecting line with the unit engine control, while the pump is equipped with a heating unit pumped liquid associated with the connecting line [EN 30274 A62C 25/00 Publ. 27.06.2003].

The disadvantage of this device is the low efficiency of fire-extinguishing associated with a limited amount of stored fire extinguishing agent and with limited consumption of extinguishing agent.

A well-known mobile foam generating plant for multipurpose use for foam generation, mainly at the nuclear fuel cycle facilities, includes a tank for water or a foaming agent solution, a pump with an electric motor, a comb for connecting air-foam generators (foam generators) of average multiplicity and fire rods, pipelines, hoses and reinforcement, additionally equipped with low expansion foam generators (K <20) and high expansion foam (K = 200-1000), working with two types of grids (usual - flat or metal tissue - volumetric weaving), and on the comb a valve is installed, which allows you to smoothly control the flow of the foaming solution supplied to the generator of high fold foam with a flow rate of 0.5-10 l / min. In addition, the tank is equipped with a lid, designed to seal it when creating a pressure in it up to 6 atm. These signs provide increased installation flexibility [RU 2308996 A62C 27/00, A62C 5/02 Publ. October 27, 2007].

The disadvantage of this device is the considerable weight and dimensions, as well as the impossibility of its use in industrial and low-rise buildings of urban and rural settlements, forest and landscape fires.

A mobile fire module developed earlier by the applicant is known, which contains fire extinguishing agents installed on an automobile trailer, characterized in that as a fire extinguishing means the mobile fire module contains at least one motor pump connected to by fire hoses and water supply lines and a frother. a frother tank, at least one water tank, fire hoses, a stationary fire installation and at least one fire fighting device extinguishing [RU 121167 A62C 25/00 Publ. 10/20/2012].

The disadvantage of a mobile fire module according to RU 121167 is the possibility of its use only in places accessible to automobile movement and the impossibility of manually transferring it to and from places of fire in places difficult to access for equipment.

Known stationary and handheld gun trunks, forming a jet of water and low-expansion foam with a range of 20-60 m. However, they do not allow for a large area of uniform coverage, require the use of expensive film-forming fluorinated blowing agents, which does not allow to obtain the required fire extinguishing effect, leads to tightening extinguishing time and high cost of blowing agents used to extinguish a fire.

It is known the use of medium expansion foam, which has increased fire extinguishing efficiency when extinguishing oil and petroleum products and medium expansion foam generators in a portable and stationary version compared with low expansion foam. However, most of the known foam generators of medium multiplicity provide foam jets from 3 to 8 m, which complicates the process of their use due to the high risk of fire department personnel working in the fire zone.

Known previously developed by the applicant device for the formation of a jet of foam of medium multiplicity of increased range, in which to improve performance, efficiency and increase firefighting efficiency by creating a combined jet of foam of medium and low multiplicity and increasing the range of foam jet of average multiplicity to 20-50 m, serves solution foaming agent on the grid in the foam generator case with the production of a jet of medium-expansion foam with the formation of a jet of foam with increasing multiplicity and reducing ysya density from the center to the periphery. At the same time, two or more jets of foaming agent solution from two or more nozzles or other means of forming directed jets are simultaneously fed to the foamer grid with the possibility of formation in the foam generator case and / or outside of it two or more contiguous and / or mutually intersecting jets of medium-sized foam with the formation of a single jet of medium expansion ratio of increased long range [RU 2170123 А62С 5/02 Publ. July 10, 2001].

A portable fire extinguishing device is known that contains a foam generator that can be connected to a fire hose, communicating with a foam generator means for mixing water with a frother, a container with a frother and means for feeding a frother into a means for mixing water with a frother, characterized in that the foam preheater is made portable, and the foaming agent is made with the possibility of its placement and transfer in the knapsack, and the means of supplying the foaming agent to the means of mixing water with foaming The former is made in the form of a hose connecting the tank located in the knapsack with the foaming agent and the means of mixing water with the foaming agent [RU 117297 А62С 15/00 Publ. 27.06.2012].

Known actuators, which are devices that transfer the force from the control or regulating mechanism to the executive and allow for circular or linear movement. In most cases, such devices are used to obtain mechanical energy from electrical. There are linear actuators, provide the conversion of mechanical energy into linear movement, and rotational actuators, providing rotational movement [https://electrosam.ru/glavnaja/jelektrooborudovanie/ustrojstva/aktuatory/, 07.20.2018].

Examples of the use of actuators in fire fighting technology in the amount of the search was not identified.

The closest in technical essence and the achieved technical result (prototype) is a device developed earlier by the applicant with a hydro-oscillator for extinguishing a fire and fire and explosion prevention with low and medium expansion foam, which increases the compactness, mobility and simplifies the rapid movement of low and medium expansion foam directly to the site fire, increasing the efficiency of fire extinguishing, the range and uniform distribution of foam across the fire area, increasing safety when extinguishing fires and fire and explosion prevention of low and medium expansion foam, contains low and medium expansion foam generator, base with pressure pipe and hydraulic oscillator with the possibility of creating automatic oscillatory movements of the foam generator in a given sector of the horizontal plane [RU 176644 А62С 15/00 Publ. 01/24/2018 (prototype)].

The disadvantage of the prototype RU 176644 is the need to enable / disable the operator and manual operator control by turning the foam generator in the vertical plane.

A common disadvantage of the known water-borne fire extinguishing devices is that the known stationary and mobile devices have satisfactory long-range capacity and foam generation performance, but are heavy and have large overall dimensions, have low mobility and can only be moved along the roads and spaces free for their dimensions. and the known compact portable fire extinguishing devices can be delivered to places inaccessible for productive equipment, but they have cf. vnitelno low efficiency due to lack of long range and performance of foam generation, and the necessity of manual operation and in the presence of operators near the extinguishing process devices.

Task and technical result

The main technical problem (the inventive problem that has not been resolved to date) that hinders the effective use of known fire extinguishing agents (foam generators, fire monitors and other fire extinguishing agents) is the need for the constant presence of operators around foam generators in the process of extinguishing fires and fire prevention from industrial enterprises with special fire and explosion hazards productions, for example, at the enterprises of the petrochemical industry or at the enterprise handling of LPG and LNG, as well as at hazardous chemical hazardous facilities, where highly toxic substances are released, at storage and manufacturing facilities for explosives, as well as at facilities where high-performance low and medium-sized combined fire extinguishing agents are necessary . That is, the known fire extinguishing agents are characterized by the lack of the ability to provide an automatic process of extinguishing a fire and fire and explosion prevention and require the constant presence of people.

In addition, well-known fire extinguishing agents ensure the formation and delivery of only individual jets of foam or sprayed water only to certain point of the fire, which is effective in extinguishing small fires in low-rise residential and industrial buildings in urban and rural settlements, in extinguishing forest, road and other landscape fires, which does not allow for controlled, fast and uniform coverage of the entire area of the fire with foam, which, in turn, significantly reduces the efficiency and rate of extinguishing major fires.

The technical result achievable with the use of the invention is to improve the efficiency of fire extinguishing and fire and explosion prevention by increasing the range and uniform distribution of foam of medium and low multiplicity across the fire area, increasing the safety of fire extinguishing process and fire and explosion prevention at especially fire and explosion-hazardous objects by enabling remote control and automatic operation of the proposed devices without the presence of operators directly in the fire extinguishing and fire explosion prevention zone.

Summary of Invention

Characteristic features of the proposed device for combined extinguishing of large-scale fires and fire and explosion prevention with low and medium expansion foam are:

- the presence of means of automated on / off and turns attached to the control system of two foam generators fixed on the traverse next to each other with the possibility of turns in the vertical and horizontal planes and with the possibility of remote control by means of a remote control or radio signals;

- the ability to control the operation of the device in the automatic mode without the presence of operators in the fire extinguishing zone and fire and fire prevention with the ability to automatically turn on / off the fire alarm signals;

- the ability to install the device near the fire-hazardous objects or the rapid delivery of the device directly to the fire zone and fire and explosion hazards and quick connection to the pressure pipe for supplying water or supplying the foaming agent water solution;

- the possibility of carrying out an automated process of extinguishing large areas of fire and fire and explosion prevention without the presence of people (personnel of firefighters, operators) in the fire zone or accident directly in the fire zone or accident.

- the possibility of expanding the tactical and technical characteristics of the fire extinguishing processes and fire and explosion prevention of low and medium expansion at the facilities where previously only water was used and only for cooling the structures enveloped in a flame.

The problem is solved, and the technical result is achieved by the fact that the device for combined extinguishing fires and fire and explosion prevention with low and medium multiplicity foam, according to the invention, contains two low and medium multiples combined on the generator beam mounted on the traverse, containing a housing placed inside the body of an average foam generation mesh package the multiplicity located in front of the body unit nozzles supplying an aqueous solution of the foaming agent on the package grids generating medium foam multiple STI, the barrel forming low expansion foam, pipeline aqueous foam solution inlet to the nozzles bore and forming a foam of low expansion foam generator and means for connecting to the pressure line, and means for automatic rotation crosspiece with zakreplennnymi foam generators therein in the vertical and horizontal planes.

The device may contain a means of regulating the volume of supply of an aqueous solution of the foaming agent from the pressure pipe to the nozzles supplying an aqueous solution of the foaming agent to the grids of the formation of jets of medium expansion foam and to the trunks of the formation of low expansion foam,

or means for supplying an aqueous solution of the foaming agent from a pressure pipe or to the nozzles for supplying an aqueous solution of the foaming agent to the grids to form jets of medium expansion foam or to the trunks of the formation of low expansion foam,

made in the form of a crane with an electric drive with the ability to connect it to the remote control system.

At the same time, the automated turning means of the traverse with the foam generators fixed on it in the vertical plane are made in the form of an actuator containing a linear drive and the electric motor, and the tool of the automated turns of the traverse with the foam generators fixed on it in the horizontal plane contains a gear rotation of the motor and the electric motor.

The electric motors of the automated turns of the traverse with foam generators fixed on it in the vertical and horizontal planes are made with the possibility of their connection to the remote control system and with the possibility of remote control by means of a remote control or radio signals of the remote control system.

In this case, the device is made

with the possibility of turns, the traverse with foam generators fixed on it in the vertical and / or horizontal planes in the form of oscillatory movements:

with the possibility of regulation by means of a remote control system of the duration, frequency and amplitude of turns of the traverse with foam generators fixed on it in vertical and / or horizontal planes,

with the possibility of starting / ending the functioning of the foam generator as a result of the supply / termination of the supply of the foaming agent solution to the pressure head

with the possibility of automatic on / off of foam generators and turns of the traverse with foam generators attached to it in the vertical and / or horizontal planes by fire alarm signals.

The means of connecting the device to the pressure pipe can be made in the form of quick-disconnecting / disconnecting rotating cam locks.

The device can be made with the possibility of its fixation on the means of transportation in the form of a tractor, motorcar, car, car trailer, water carrier or gas-oil-producing platform, on a stationary platform, car lift, fire foam lift, automatic sliding ladder or arm.

Brief Description of the Drawings

The invention is illustrated in the drawings.

FIG. 1, 2, 3 and 4 are shown, respectively, front view, side view, top view and axonometric projection of the claimed device for extinguishing large-scale fires and fire and explosion prevention with low and medium expansion foam.

FIG. 5, 6 shows a diagram of the formation of a combined jet of low and medium expansion foam in the device as a result of the application of medium expansion foam jets to a low expansion foam jet and their joint movement into the fire zone.

FIG. 7 is a variant of the design of the quick coupling / disconnection of the rotary eccentric locking pins for connecting the device to the pressure pipe.

In the figures of the drawings the numbers of the positions shown:

nozzles 1 for the formation of jets of medium expansion foam,

foam generators 2 with packages of grids 15 of medium-expansion foam formation and trunks 3 of low-expansion foam formation located inside their bodies,

unit of rotation of foam generators in the vertical plane 4 in the form of an actuator 6, containing a linear actuator of rotation of the foam generator in the vertical plane and an electric motor connected to the control system with the possibility of its connection to the remote control system,

node 5 of rotation of foam generators in the horizontal plane 5, containing a gear transmission of rotation 11 for rotation of the foam generators in the horizontal plane and the motor 7 connected to the control system with the possibility of its connection to the remote control system,

quick-detachable connections 8 with rotary eccentric clamps 12 of the Kamlok type and flange 9 for connecting the device to the discharge pipeline,

traverse 10 for fixing foam generators on it and ensuring simultaneous rotation of foam generators in a vertical plane by means of an actuator 6, which contains a linear actuator of rotation of foam generators in a vertical plane and connected to an electric motor control system,

pipe 13 supplying water or an aqueous solution of the foaming agent to the nozzles 1 and low-multiplicity foam generators 3,

located under the pipe 13 stiffener 14 for attachment to it of the actuator 6, providing turns of the foam generators in the vertical plane.

The implementation of the invention

The inventive device for extinguishing large-scale fires and fire and explosion prevention of low and medium multiplicity foam, hereinafter referred to as the “device”, is intended for extinguishing fires with uniform distribution of low and medium expansion foam over the area of fires of combustible liquids of class B, solid combustible materials of Class A, as well as liquefied hydrocarbon and natural gases (LPG and LNG).

The device can also be used for cooling and / or fire protection of buildings, structures, machinery, equipment, combustible and explosive materials and products, as well as fire and explosion prevention at accident sites with fire and explosive materials.

The device is designed to create combined low-and medium-frequency air-jet combined foam jets with the possibility of their automated direction to the fire extinguishing and fire-prevention zone and with the possibility of remote control of on / off foam generators and foam generators turning in the vertical and horizontal planes.

The device can be effectively used to extinguish large-scale fires of classes A and B with foam, as well as liquefied hydrocarbon and natural gases (LPG and LNG).

The device is operational when using all types of domestic and foreign foaming agents with a concentration of from 3 to 6% to obtain low and medium expansion foam

In terms of resistance to environmental climatic factors, the device complies with the Y (temperate climate) and UHL design and location category 1 according to GOST 15150-69.

The device with remote control for automated extinguishing of fire and fire and explosion prevention with combined low and medium expansion foam, further - “device”, contains (Fig. 1-3): two foam generators 2 with blocks of nozzles 1 for forming jets of medium expansion foam by means of packages of grids 15, placed below the inside of the foam generator bodies, the trunks 3 of forming a jet of low-expansion foam, the node of the foam generators turns in a vertical plane 4 in the form of an actuator with a linear actuator and connected to the distant system motor control 7, a unit of rotation of foam generators in the horizontal plane 5 with a gearing of rotation 11 and a motor 7 attached to the remote sending system, a quick-detachable connection 8 with rotary eccentric locks 12 of the type of camo and a flange 9 for connecting the device to the discharge pipeline.

The proposed device operates as follows:

An aqueous solution of the foaming agent at a predominant pressure of 0.8 MPa (8 kgf / cm ² ) through a pressure pipe with a preferred nominal diameter of 100 m is fed into the device through the nozzle 13 of water supply or an aqueous solution of the foaming agent and divided into two streams.

In one stream, an aqueous solution of the foaming agent is supplied to the nozzles 1 and then to the packages of grids 15 of the foam generators 2, where, when mixed with the ejected air, jets of medium expansion are formed.

Another stream of an aqueous solution of the foaming agent is supplied to the trunks 3, in which, when mixed with the ejected air, a jet of low expansion foam is formed.

In case of contact of a jet of low and medium expansion foam, a combined jet of low and medium expansion foam is created (Fig. 5, 6).

Low-expansion foam jets, possessing higher density and greater kinetic energy compared to medium-expansion foam, moves with greater speed, first touches the burning surface and, having a higher heat capacity, cools the burning surface. As a result of this, protection of the medium-depth foam stream following the streams is ensured from thermal effects and rapid destruction.

Medium-sized foam streams coming in next mainly isolate the combustion zone from combustible vapors, gases and oxygen of the air.

As a result of the combined action of low and medium-sized combined jets of foam, effective suppression of fires and fire and explosion prevention on the ground of accidents and combustible and explosive materials is ensured.

At the same time, low-expansion foam jets at the bottom, having a greater density, greater kinetic energy and, consequently, greater range, provide a more distant delivery of medium-expansion foam jets compared to conventional foam generators of average multiplicity, which also ensures effective fire extinguishing and fire and fire prevention at accident sites and flammable and explosive materials.

The design of the proposed device allows its use in automatic mode with remote control of its on / off and operation.

The device has a compact design (Fig. 1-4), it is convenient to carry / transport and connect to the main pipelines of water supply or foaming agent water solution.

By bundling the device with standard quick-detachable connections to pressure pipelines, it is possible to use it in conjunction with other fire hydraulics systems and fire hoses.

A device is proposed for effective fire extinguishing and fire prevention by combined low and medium expansion air-mechanical foam can be quickly transferred or transported to the required place, quickly assembled and prepared for use in areas inaccessible and / or difficult to reach for conventional fire equipment - in industrial enterprises with special explosion and fire hazards of production, for example, at the enterprises of the petrochemical industry or at enterprises with handling of LPG and LNG, as well as for accidents no-chemical hazardous facilities, where it is possible to release potent toxic substances, on the storage and manufacture of explosives, as well as on sites where it is necessary to use high-performance foams of low and medium multiplicity, including combined jets, as a fire extinguishing agent; It can also be effectively used to extinguish forest and other landscape fires.

The device is operational when using all types of domestic and foreign foaming agents with a concentration of from 3 to 6% to obtain low and medium expansion foam

In terms of resistance to environmental climatic factors, the device complies with the Y (temperate climate) and UHL design and location category 1 according to GOST 15150-69.

As an actuator, the linear electric drive of the LA 36 3 B32 + 10 150 21 V or analogue, the main characteristics of which are shown in Table 1, can be used for turning the device in the vertical plane.

To rotate the device in the horizontal plane can be used toothed gear rotation with electric horizontal movement, the main characteristics of which are shown in Table 2.

Characteristic features that provide the ability to confidently and safely achieve a technical result when using the claimed device (the causal link of essential features and the achieved result) are:

- the possibility of rapid mobile delivery of the device directly to the fire zone or fire and explosion prevention;

- the possibility of carrying out the process of extinguishing large-scale fires fire and explosion prevention in the automatic mode of operation of the device without the constant presence of people (personnel of firefighters);

- ease of preparation for use, use and disassembly;

- simplicity of design and operation;

- high reliability due to simple equipment design.

- the possibility of high performance generation air-mixed foam low 1 and medium multiplicity;

- the formation and use of combined air-jet jets of low expansion foam and medium expansion foam;

- the ability to create automatic oscillatory movements of dual foam generators in various angular ranges of the device, providing fast uniform foam coverage of the entire surface of the fire and fire and explosion prevention,

- the ability to effectively extinguish fires or effective protection against fire in places that are difficult to reach and inaccessible to commonly used known productive equipment, due to the possibility of a mobile device directly to the place of fire extinguishing and fire and explosion prevention.

A detailed description of the design and features of the operation prove the industrial applicability of the invention.

The individual parts and components of the equipment of the claimed device according to the invention for the implementation of these functions can be made of structural elements and materials commonly used in fire fighting equipment, on conventional equipment using conventional technologies known and used in the field of modern fire fighting and fire prevention equipment.

Claims (22)

1. Device for combined extinguishing fires and fire and explosion prevention with low and medium expansion foam, characterized in that it contains two mounted on the traverse of the generator with a combined foam of low and medium multiplicity, containing a housing with a package of grids of medium-sized foam generation inside the housing, an injector unit supplying an aqueous solution of a foaming agent to a stack of medium-sized foam generation grids located in front of the body, low formation foam barrel, pipeline supplying an aqueous solution of the foaming agent to the nozzles supplying the aqueous solution of the foaming agent to the stack of grids of medium-sized foam generation and to the barrel of forming low-expansion foam, means of connecting the foam generators to the pressure pipe of an aqueous solution of the foaming agent, means of automated traverse turns with foam generators fixed on it in vertical and horizontal planes. 2. The device according to claim 1, characterized in that the means of automated turns of the traverse with foam generators fixed on it in the vertical plane is made in the form of an actuator containing a linear drive and an electric motor. 3. The device according to claim 1, characterized in that the means of automated turns of the traverse with foam generators fixed on it in the horizontal plane contains a gear transmission of rotation and an electric motor. 4. The device according to claim 1, characterized in that it contains a means of regulating the volume of supply of an aqueous solution of the foaming agent from the discharge pipeline to the nozzles of the supply of an aqueous solution of the foaming agent to the grids of formation of jets of medium expansion foam and to the trunks of formation of low expansion foam. 5. The device according to claim 1, characterized in that it contains means for supplying an aqueous solution of a foaming agent from a pressure pipe or to nozzles for supplying an aqueous solution of a foaming agent to the grids of formation of jets of medium expansion foam or to the trunks of formation of low expansion foam. 6. Device according to any one of paragraphs. 4, 5, characterized in that the means of regulating the volume of supply of an aqueous solution of the foaming agent from the discharge pipeline to the nozzles of the supply of an aqueous solution of the foaming agent to the grids of formation of jets of medium-expansion foam and the trunks of formation of low-expansion foam is possible in the form of a crane with electric drive with the possibility of its connection to the remote management. 7. The device according to claim 1, characterized in that the electric motors of the means of automated turns of the traverse with foam generators fixed on it in the vertical and horizontal planes are made with the possibility of their connection to the remote control system. 8. The device according to claim 1, characterized in that the electric motors of the turning means are traverses with foam generators fixed on it in the vertical and horizontal planes made remotely controlled by means of a remote control or radio signals of the remote control system. 9. The device according to claim 1, characterized in that it is made with the possibility of rotation of the traverse with foam generators fixed on it in the vertical and / or horizontal planes in the form of oscillatory movements. 10. The device according to claim 1, characterized in that it is made with the possibility of controlling, by a remote control system, the duration, frequency and amplitude of turns of the traverse with foam generators fixed on it in vertical and / or horizontal planes. 11. The device according to claim 1, characterized in that it is made with the possibility of starting / ending the operation of the foam generator as a result of applying / stopping the supply of the foaming agent solution to the pressure pipe by means of control system signals. 12. The device according to claim 11, characterized in that it is made with the possibility of automatic on / off foam generators and traverse turns with foam generators fixed on it in the vertical and / or horizontal planes according to the fire alarm signals. 13. The device according to claim 1, characterized in that the means of connection to the pressure pipe is made in the form of a quick-release connection / disconnection by rotating cam-type eccentric locks. 14. The device according to claim 1, characterized in that it is made with the possibility of its fixing on the means of transportation in the form of a tractor, motorcar, car, car trailer, watercraft or gas-oil-producing platform. 15. The device according to claim 1, characterized by the fact that it is made with the possibility of its fixing on a stationary platform, car lift, fire foam lift, auto-sliding sliding ladder or manipulator.

Images