CN112479067A

CN112479067A - Tower crane fracture control room life saving device based on information technology and operation method thereof

Info

Publication number: CN112479067A
Application number: CN202011475441.9A
Authority: CN
Inventors: 蒋来苟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-03-12

Abstract

The invention discloses a tower crane fracture control room life saving device based on information technology and an operation method thereof, wherein the tower crane fracture control room life saving device comprises a tower crane, a shell is fixedly arranged on the front side of the tower crane, a pop-up cavity with an upward opening is arranged in the shell, guide posts are symmetrically and fixedly arranged at the left and right positions of the bottom wall of the pop-up cavity, guide blocks in sliding fit with the left and right side walls of the pop-up cavity are arranged on the guide posts, a pop-up block is fixedly arranged between the guide blocks, the bottom of the pop-up block and the bottom wall of the pop-up cavity are fixedly connected through two first springs, pistons fixed at the bottom wall of the pop-up cavity are symmetrically arranged at the left and; the control room is in the air in through the balancing weight with the control room focus adjustment, and the cooperation through parachute and stabilizer stabilizes the control room in the air simultaneously, then increases the resistance that the parachute received through drainage wind-force for the slow decline of control room.

Description

Tower crane fracture control room life saving device based on information technology and operation method thereof

Technical Field

The invention relates to the technical field of building construction, in particular to a tower crane fracture control room life saving device based on an information technology and an operation method thereof.

Background

The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object at a specified place. It includes foundation engineering construction, major structure construction, roofing engineering construction, decoration engineering construction etc. and the tower crane is the hoisting equipment that is the most commonly used on the building site also known as "tower crane", with the extension (height) of a section one (being called "standard festival" for short) for hang the raw and other materials of construction such as reinforcing bar, stupefied, concrete, steel pipe of construction usefulness, the tower crane is the equipment that is indispensable on the building site, the tower crane has cracked risk, traditional machine has following shortcoming:

1. after the tower crane is broken, the control room and the tower crane are not conveniently separated, so that the loss is increased;

2. the tower crane is inconvenient to smoothly land after being broken, so that workers can be injured;

3. after the tower crane is broken, the control room is in an unstable state in the air, and the traditional machine is not convenient to stabilize the control room;

4. the traditional machine is inconvenient for transmitting position information after falling to the ground and is inconvenient for rescuing workers in time.

Disclosure of Invention

The invention aims to provide a tower crane breakage control room life saving device based on information technology and an operation method thereof, which are used for overcoming the defects in the prior art.

The invention relates to a tower crane fracture control room life saving device based on information technology, which comprises a tower crane, wherein a shell is fixedly arranged on the front side of the tower crane, an ejection cavity with an upward opening is arranged in the shell, guide posts are symmetrically and fixedly arranged on the left and right positions of the bottom wall of the ejection cavity, guide blocks in sliding fit with the left and right side walls of the ejection cavity are arranged on the guide posts, an ejection block is fixedly arranged between the guide blocks, the bottom of the ejection block and the bottom wall of the ejection cavity are fixedly connected through two first springs, pistons fixed on the bottom wall of the ejection cavity are symmetrically and horizontally arranged between the first springs, the ejection block abuts against the pistons, air tank grooves symmetrically and horizontally arranged are arranged on the lower side of the ejection cavity, an air tank is fixedly arranged on the bottom wall in the air tank grooves, an exhaust pipe is communicated with the inner side of the air tank, and extends upwards to the ejection, the ejecting block is internally provided with a control chamber which can be opened, the lower side of the control chamber is provided with an open slot with a downward opening, the inner side wall of the open slot is slidably provided with a balancing weight, the balancing weight is fixedly connected with the top wall of the open slot through a connecting wire, the balancing weight is internally embedded with a laser, four groups of damping grooves with identical shape and structure characteristics are annularly arranged around the open slot, the inner side wall of each damping groove is slidably provided with a damping block, the damping block is fixedly connected with the top wall of the damping groove through a second spring, the damping block is internally provided with an extending groove with a downward opening, the top wall of the extending groove is fixedly provided with a driving motor, the side wall of the extending groove is fixedly provided with a threaded block, the threaded block is internally screwed with a threaded shaft, the threaded shaft is internally provided with a spline groove with an upward opening, a spline shaft is in the spline groove, screw shaft downwardly extending extends and has set firmly the contact pad in the extension inslot, the shock attenuation groove upside is equipped with the outside fan chamber of opening, the motor has set firmly on the fan intracavity wall, fan chamber opening part has set firmly the iron wire net, the iron wire net medial surface has set firmly the fixed plate, the fixed plate medial surface rotate install with the motor shaft that the motor is connected, the last disc that has set firmly of motor shaft, the disc is fitted with a contraceptive ring and is equipped with six flabellums, the control room upside is equipped with the component of opening the umbrella that is used for opening the umbrella, the control room both sides are equipped with the guide element who is used for assisting behind the opening the umbrella with the air current direction, be equipped with in the casing and be used for the restriction pop out.

Optionally, the parachute opening element comprises a parachute bag groove with an upward opening and located on the upper side of the control room, a parachute bag is arranged in the parachute bag groove, a first parachute opener is arranged on the parachute bag, a groove with an upward opening is formed in the rear side of the parachute bag groove, a stabilizing parachute bag is arranged in the groove, a second parachute opener is arranged on the stabilizing parachute bag, a connecting block fixed on the upper side of the pop-up block is arranged between the groove and the parachute bag groove, a collecting cavity is arranged in the connecting block, rollers are symmetrically and rotatably mounted on the upper and lower positions of the right wall of the collecting cavity, a gear groove is formed in the right side of the collecting cavity, the rollers extend rightwards to the gear grooves and are fixedly provided with gears meshed with each other, a driving cavity is formed in the left side of the collecting cavity, the rollers extend leftwards to the driving cavity, and the rollers on the upper side are connected with a, and the roller is wound with a protective film which is fixedly arranged at the opening at the rear side of the groove and the opening at the front side of the umbrella bag groove respectively.

Optionally, the guide element includes fixed blocks fixed to left and right sides of the connecting block and symmetrically located, a rotation cavity is provided in the fixed block, a step motor is fixed to an inner wall of the rotation cavity, a worm rotatably mounted to an outer wall of the rotation cavity is connected to an outer side of the step motor, worm gear shafts are rotatably mounted to front and rear side walls of the rotation cavity, a worm gear engaged with the worm and the worm gear is fixedly mounted to the worm gear shaft, a connecting rod fixedly mounted to the worm gear shaft is provided to a rear side of the worm gear, the connecting rod extends outward to the rotation cavity and is fixedly provided with a bellows communicated with the fan cavity, a groove for movement of the connecting rod is provided in the fixed block, and a protective film is fixedly provided in the groove.

Optionally, the spacing component is including being located pop out the recovery chamber of chamber both sides and bilateral position symmetry and intercommunication, the outer wall has set firmly first electro-magnet, it has the stopper to retrieve chamber lateral wall slidable mounting, the stopper outside has set firmly the second electro-magnet, the second electro-magnet with through third spring fixed connection between the first electro-magnet, the stopper inwards extends to pop out the intracavity and stretch into in the guide block, be equipped with the opening in the guide block outwards and supply the restriction groove that the stopper is deep.

Optionally, an information transmitter embedded in the pop-up block is arranged on the left side of the umbrella bag slot.

An operation method of a tower crane breakage control room life saving device based on an information technology comprises the following specific steps:

the method comprises the steps that firstly, after a tower crane is broken, a shell is in a weightless state, gas in a gas tank is discharged through an exhaust pipe, a piston is knocked out by the gas, a pop-up block is pushed to move upwards, a first electromagnet and a second electromagnet are electrified, a limiting block is separated from a guide block through adsorption, then a first spring is reset, the pop-up block is pushed to enable the piston to obtain assistance when the pop-up block is pushed, the pop-up block is pushed into the air through thrust, and then a connecting line is pulled due to a gravity balancing weight;

secondly, after the pop-up block is positioned in the air, a driving motor is started, then the roller drives a gear to rotate, so that a protective film is pulled and broken, a first parachute opener and a second parachute opener are started, then a parachute bag and a stable parachute bag are opened, the parachute is opened under the matching of a balancing weight, the stable parachute bag and the parachute bag, and then the pop-up block is vertically downward through the balancing weight;

thirdly, a motor shaft is started to drive fan blades to rotate to form wind power, then a stepping motor is started to enable a worm to drive a worm gear to rotate, a connecting rod is driven to rotate around a worm gear shaft, the thin film is torn, the connecting rod drives a corrugated pipe to guide the wind power to the parachute bag through self-locking of the worm gear and the worm, resistance received by the parachute bag is improved through increasing the wind power, and the pop-up block descends stably and slowly;

and fourthly, after laser rays emitted by laser are irradiated to the ground and the numbers are displayed, starting a driving motor, rotating a spline shaft through a threaded shaft, pushing out the contact pad by the threaded shaft after threaded connection, reducing impact force through a second spring after the contact pad is contacted with the ground, enabling landing to be stable, and transmitting positioning information to a cloud end by an information transmitter to enable rescue to be fast.

The invention has the beneficial effects that:

1. the control chamber is popped up after the tower crane is broken through the piston and the spring, so that the control chamber has an initial rising speed after being popped up, the control chamber is separated from other parts, and the control chamber is far away from the broken tower crane, so that the safety of workers can be guaranteed;

2. when the control room is about to contact the ground, light is irradiated to the bottom surface through laser to read a numerical value, then the contact pad is controlled to support and absorb shock, and force is offset through the spring, so that the control room can land stably;

3. the gravity center of the control room is adjusted through the balancing weight when the control room is in the air, the control room is stabilized in the air through the matching of the parachute and the stabilizing parachute, and then the resistance borne by the parachute is increased through the drainage wind power, so that the control room slowly descends;

4. after landing, the position information is transmitted out of the cloud end through the information transmitter and an alarm is given, so that the rescue time is greatly shortened, and workers are protected.

Drawings

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of a tower crane breakage control room life saving device based on information technology;

FIG. 2 is a schematic view of the structure of the control room of FIG. 1;

FIG. 3 is a schematic view of the structure at A-A in FIG. 2;

FIG. 4 is a schematic view of the structure at B-B in FIG. 2;

FIG. 5 is a schematic view of the structure of the damper block of FIG. 2;

FIG. 6 is a schematic view of the first electromagnet of FIG. 2;

fig. 7 is a schematic structural view of fig. 2 at the fixed block.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 7, according to the embodiment of the invention, a tower crane breakage control room life saving device based on information technology comprises a tower crane 11, a shell 12 is fixedly arranged on the front side of the tower crane 11, a pop-up cavity 69 with an upward opening is arranged in the shell 12, guide posts 26 are symmetrically and fixedly arranged on the left and right sides of the bottom wall of the pop-up cavity 69, guide blocks 36 in sliding fit with the left and right side walls of the pop-up cavity 69 are arranged on the guide posts 26, pop-up blocks 70 are fixedly arranged between the guide blocks 36, the bottom of the pop-up blocks 70 and the bottom wall of the pop-up cavity 69 are fixedly connected through two first springs 27, pistons 32 fixed on the bottom wall of the pop-up cavity 69 are symmetrically arranged on the left and right sides between the first springs 27, the pop-up blocks 70 abut against the pistons 32, gas tank grooves 33 symmetrically arranged on the left and right sides of the lower side of the, the inboard intercommunication of gas pitcher 34 has blast pipe 35, blast pipe 35 upwards extend to pop up in the chamber 69 with the piston 32 intercommunication, be equipped with the control room 13 that can open in the pop-up piece 70, control room 13 downside is equipped with the decurrent open slot 28 of opening, open slot 28 inside wall slidable mounting has balancing weight 30, balancing weight 30 with through connecting wire 29 fixed connection between the open slot 28 roof, the balancing weight 30 is embedded to have radium-shine 31, four groups of shape structural feature identical damping channels 49 are established to the ring all around to the open slot 28, damping channel 49 inside wall slidable mounting has snubber block 37, snubber block 37 with pass through second spring 50 fixed connection between the damping channel 49 roof, be equipped with the decurrent groove 51 that stretches out of opening in the snubber block 37, stretch out the groove 51 roof and set firmly driving motor 52, the screw block 56 has been set firmly on the groove 51 lateral wall of stretching out, the thread block 56 is connected with a thread shaft 53 through a thread, a spline groove 54 with an upward opening is arranged in the thread shaft 53, a spline shaft 55 is matched with the spline in the spline groove 54, the spline shaft 55 extends upwards into the extending groove 51 to be connected with the driving motor 52, the thread shaft 53 extends downwards into the extending groove 51 and is fixedly provided with a contact pad 57, the upper side of the damping groove 49 is provided with a fan cavity 20 with an outward opening, the inner wall of the fan cavity 20 is fixedly provided with a motor 24, the opening of the fan cavity 20 is fixedly provided with an iron net 21, the inner side of the iron net 21 is fixedly provided with a fixing plate 22, the inner side of the fixing plate 22 is rotatably provided with a motor shaft 23 connected with the motor 24, the motor shaft 23 is fixedly provided with a disc 48, the disc 48 is provided with six fan blades 47 in a surrounding manner, the upper side of the control chamber 13 is provided with an umbrella opening element 101 for opening, two sides of the control chamber 13 are provided with guide elements 102 for guiding, a limiting element 103 for limiting the movement of the ejecting block 70 is arranged in the shell 12.

Preferably, parachute component 101 is including being located the ascending parachute package groove 39 of control room 13 upside and opening, be equipped with parachute package 43 in the parachute package groove 39, be equipped with first parachute opener 71 on the parachute package 43, the parachute package groove 39 rear side is equipped with the ascending recess 41 of opening, be equipped with stable parachute package 42 in the recess 41, be equipped with second parachute opener 72 on the stable parachute package 42, recess 41 with be equipped with between the parachute package groove 39 and be fixed in pop-up block 70 upside connecting block 18, be equipped with in the connecting block 18 and collect chamber 45, the upper and lower position symmetry rotation of right wall installs gyro wheel 14 in the collection chamber 45, it is equipped with gear groove 67 to collect chamber 45 right side, gyro wheel 14 extends to right in gear groove 67 and set firmly intermeshing's gear 46, it is equipped with drive chamber 68 to collect chamber 45 left side, gyro wheel 14 extends to left in drive chamber 68, the roller 14 at the upper side is connected with a driving motor 66 fixed on the left wall of the driving cavity 68, the roller 14 is wound with a protective film 40 fixedly arranged at the rear opening of the groove 41 and the front opening of the umbrella bag groove 39 respectively, and the protective film 40 is torn by rotation, so that the umbrella can be opened smoothly.

Preferably, the guide element 102 includes fixed blocks 17 fixed to the left and right sides of the connecting block 18 and symmetrically located, a rotation cavity 62 is provided in the fixed block 17, a step motor 44 is fixed to the inner wall of the rotation cavity 62, a worm 63 rotatably mounted to the outer wall of the rotation cavity 62 is connected to the outer side of the step motor 44, worm shafts 65 are rotatably mounted to the front and rear side walls of the rotation cavity 62, worm wheels 64 matched with the worm wheels of the worm 63 are fixed to the worm shafts 65, a connecting rod 19 fixed to the worm shafts 65 is provided at the rear side of the worm wheels 64, the connecting rod 19 extends outward to the rotation cavity 62 and is fixed to a bellows 15 communicating with the fan cavity 20, a groove for moving the connecting rod 19 is provided in the fixed block 17, and a protective film 16 is fixed to the groove and is driven by the worm wheels to be self-locked, so that the guide is stable.

Preferably, the limiting element 103 includes a recycling cavity 60 located at two sides of the popping cavity 69 and symmetrically communicated with each other in the left-right direction, the outer wall is fixedly provided with a first electromagnet 25, a limiting block 58 is slidably mounted on the side wall of the recycling cavity 60, a second electromagnet 59 is fixedly arranged on the outer side of the limiting block 58, the second electromagnet 59 is fixedly connected with the first electromagnet 25 through a third spring 61, the limiting block 58 extends inwards to the popping cavity 69 and extends into the guide block 36, and a limiting groove with an outward opening and for the limiting block 58 to penetrate into is formed in the guide block 36.

Preferably, the information transmitter 38 embedded in the pop-up block 70 is arranged at the left side of the bag slot 39.

firstly, after the tower crane 11 is broken, the shell 12 is in a weightless state, gas in the gas tank 34 is discharged through the exhaust pipe 35, the piston 32 is knocked out by the gas, the pop-up block 70 is pushed to move upwards, the first electromagnet 25 and the second electromagnet 59 are electrified, the limiting block 58 is separated from the guide block 36 through adsorption, then the first spring 27 is reset, the pop-up block 70 is pushed, the piston 32 obtains assistance when the pop-up block 70 is pushed, the pop-up block 70 is pushed into the air through thrust, and then the connecting line 29 is pulled due to the gravity balancing weight 30;

secondly, after the pop-up block 70 is positioned in the air, the driving motor 66 is started, then the roller 14 drives the gear 46 to rotate, so that the protective film 40 is pulled and broken, the first parachute opener 71 and the second parachute opener 72 are started, then the parachute package 43 and the stabilizing parachute package 42 are opened, the parachute is opened under the matching of the counterweight block 30, the stabilizing parachute package 42 and the parachute package 43, and then the pop-up block 70 is vertically downward through the counterweight block 30;

thirdly, the motor 24 is started to drive the fan blades 47 to rotate to form wind power, then the stepping motor 44 is started to enable the worm 63 to drive the worm wheel 64 to rotate, the connecting rod 19 is driven to rotate around the worm wheel shaft 65, the thin film 16 is torn, the connecting rod 19 drives the corrugated pipe 15 to guide the wind power to the parachute pack 43 through self-locking of the worm wheel and the worm, resistance received by the parachute pack 43 is improved through increasing the wind power, and the pop-up block 70 descends stably and slowly;

fourthly, after laser rays emitted by the laser 31 are irradiated to the ground and the numbers are displayed, the driving motor 52 is started, then the spline shaft 55 rotates through the threaded shaft 53, the threaded shaft 53 enables the contact pad 57 to be rotationally pushed out after being in threaded connection, then the contact pad 57 is in contact with the ground, the impact force is reduced through the second spring 50, the landing is stable, and then the information transmitter 38 enables the rescue to be fast by transmitting the positioning information to the cloud.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a tower crane fracture control room life saving equipment based on information technology, includes the tower crane, the tower crane front side has set firmly the casing, be equipped with the ascending chamber that pops out of opening in the casing, its characterized in that: the ejection cavity bottom wall left and right position symmetry is fixedly provided with guide posts, the guide posts are provided with guide blocks which are in sliding fit with the ejection cavity left and right side walls, ejection blocks are fixedly arranged between the guide blocks, the bottoms of the ejection blocks and the ejection cavity bottom wall are fixedly connected through two first springs, pistons fixed on the ejection cavity bottom wall are symmetrically arranged between the first springs left and right positions, the ejection blocks are abutted against the pistons, the ejection cavity lower side is provided with gas tank grooves which are symmetrical left and right, the bottom wall in the gas tank grooves is fixedly provided with a gas tank, the inner side of the gas tank is communicated with a gas exhaust pipe, the gas exhaust pipe extends upwards to the ejection cavity and is communicated with the pistons, a control chamber which can be opened is arranged in the ejection blocks, the lower side of the control chamber is provided with an opening downwards, and the inner side wall of the opening groove, the counterweight block is fixedly connected with the top wall of the open slot through a connecting wire, the counterweight block is embedded with a laser beam, four groups of damping grooves with completely same shape and structural characteristics are annularly arranged around the open slot, damping blocks are slidably arranged on the inner side wall of each damping groove, the damping blocks are fixedly connected with the top wall of each damping groove through a second spring, an extending groove with a downward opening is arranged in each damping block, a driving motor is fixedly arranged on the top wall of each extending groove, a thread block is fixedly arranged on the side wall of each extending groove, a thread shaft is connected with the thread block in an internal thread manner, a spline groove with an upward opening is arranged in each thread shaft, a spline shaft is in spline fit in each spline groove, the spline shaft extends upwards into the extending groove and is connected with the driving motor, the thread shaft extends downwards into the extending groove and is fixedly provided with a contact pad, and a fan cavity with an outward opening is, the fan comprises a fan cavity, and is characterized in that a motor is fixedly arranged on the inner wall of the fan cavity, an iron net is fixedly arranged at the opening of the fan cavity, a fixing plate is fixedly arranged on the inner side of the iron net, a motor shaft connected with the motor is rotatably arranged on the inner side of the fixing plate, a disc is fixedly arranged on the motor shaft, six fan blades are annularly arranged on the disc, an umbrella opening element for opening an umbrella is arranged on the upper side of a control room, guide elements for guiding air flow after the umbrella is opened are arranged on the two sides of the control room, and a limiting element for limiting the movement of an ejection block is.

2. The information technology-based tower crane breakage control room lifesaving device of claim 1, which is characterized in that: the parachute opening element comprises a parachute package groove which is positioned on the upper side of the control room and has an upward opening, a parachute package is arranged in the parachute package groove, a first parachute opener is arranged on the parachute package, a groove with an upward opening is formed in the rear side of the parachute package groove, a stabilizing parachute package is arranged in the groove, a second parachute opener is arranged on the stabilizing parachute package, a connecting block fixed on the upper side of the popping block is arranged between the groove and the parachute package groove, a collecting cavity is arranged in the connecting block, rollers are symmetrically and rotatably arranged on the upper and lower positions of the right wall in the collecting cavity, a gear groove is formed in the right side of the collecting cavity, the rollers extend rightwards to the inside of the gear groove and are fixedly provided with gears which are meshed with each other, a driving cavity is arranged on the left side of the collecting cavity, the rollers extend leftwards to the inside of the driving cavity, and the rollers, and the roller is wound with a protective film which is fixedly arranged at the opening at the rear side of the groove and the opening at the front side of the umbrella bag groove respectively.

3. The information technology-based tower crane breakage control room lifesaving device of claim 2, which is characterized in that: the guide element comprises fixed blocks which are fixedly arranged on the left side and the right side of the connecting block and are symmetrical in position, a rotating cavity is arranged in each fixed block, a stepping motor is fixedly arranged on the inner wall of the rotating cavity, a worm which is rotatably arranged on the outer wall of the rotating cavity is connected to the outer side of the stepping motor, worm wheel shafts are rotatably arranged on the front side wall and the rear side wall of the rotating cavity, worm wheels matched with the worm and the worm wheel are fixedly arranged on the worm wheel shafts, a connecting rod fixedly arranged on the worm wheel shafts is arranged on the rear sides of the worm wheels, the connecting rod extends outwards to form the rotating cavity and is fixedly provided with a corrugated pipe communicated with the fan cavity, a groove for moving the connecting rod is arranged in.

4. The information technology-based tower crane breakage control room lifesaving device of claim 3, which is characterized in that: spacing component is including being located pop out the recovery chamber of chamber both sides and bilateral position symmetry and intercommunication, the outer wall has set firmly first electro-magnet, it has the stopper to retrieve chamber lateral wall slidable mounting, the stopper outside has set firmly the second electro-magnet, the second electro-magnet with through third spring fixed connection between the first electro-magnet, the stopper inwards extends to pop out the intracavity and stretch into in the guide block, be equipped with the opening in the guide block outwards and supply the restriction groove that the stopper is deep.

5. The information technology-based tower crane breakage control room lifesaving device of claim 1, which is characterized in that: and an information transmitter embedded in the pop-up block is arranged on the left side of the umbrella bag groove.

6. An operation method of a tower crane breakage control room life saving device based on an information technology is characterized by comprising the following specific steps: