CN210321141U - Stepping preheating furnace - Google Patents

Abstract

The utility model provides a stepping preheating furnace, which comprises a furnace body, a feeding furnace door, a feeding device, a feeding cantilever roller, a discharging furnace door, a discharging device, a discharging cantilever roller, a combustion system and a stepping beam mechanism; one end of the discharging cantilever roller is positioned in the furnace body, and the other end of the discharging cantilever roller is connected with a discharging device positioned outside the discharging furnace door; the combustion system is arranged in the furnace body, and two ends of the walking beam mechanism are respectively connected with the inner end of the furnace of the feeding cantilever roller and the inner end of the furnace of the discharging cantilever roller. The utility model discloses a marching type preheater is difficult to drop at the in-process rod in the use, and the rod transports the mode in the furnace body freely adjustable, has saved interior space of stove greatly, and this preheater does not use chain and charging tray simultaneously, and difficult messenger's part produces the loss because of rapid cooling and rapid heating, reduction in production cost.

Description

Stepping preheating furnace

Technical Field

The utility model relates to a preheater especially relates to a marching type preheater.

Background

Industrial furnaces or preheating furnaces are thermal devices that heat materials or workpieces by using heat generated by burning fuel or converting electric energy in industrial production. In the prior art, a preheating furnace adopts chain type preheating and push rod type preheating, a chain is easy to extend and deform when being heated in the operation process of the chain type preheating furnace, the position of a bar to be heated is deviated due to extension, the manipulator is inaccurate in positioning, the bar is easy to fall off due to the fact that the chain is inclined in the operation process, the chain is often extended and retracted to cause damage, and the cost is increased; the push-down preheating furnace needs to be provided with a tray for bearing the bars, the feeding and discharging hearth of the tray needs to be heated and cooled, the energy is wasted by absorbing heat, and the tray is easy to damage due to frequent rapid cooling and rapid heating, so that the cost is increased.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a do not use chain and charging tray, be difficult for making the part because of the rapid cooling and rapid heating produces the loss, reduce manufacturing cost's marching type preheater.

The technical scheme is as follows: the furnace comprises a furnace body, a feeding furnace door, a feeding device, a feeding cantilever roller, a discharging furnace door, a discharging device, a discharging cantilever roller, a combustion system and a walking beam mechanism; one end of the feeding cantilever roller is positioned in the furnace body, the other end of the feeding cantilever roller is positioned outside the furnace body, and the feeding cantilever roller is arranged along the adjacent side of the feeding furnace door from the feeding furnace door; the feeding device is positioned outside the feeding furnace door and penetrates through the feeding furnace door to be connected with one end of the feeding cantilever roller positioned in the furnace body; one end of the discharge cantilever roller is positioned in the furnace body, the other end of the discharge cantilever roller is positioned outside the furnace body, and the discharge cantilever roller is arranged along the adjacent side of the discharge furnace door from the discharge furnace door; the discharging device is positioned outside the discharging furnace door and penetrates through the discharging furnace door to be connected with one end of the discharging cantilever roller positioned in the furnace body; the combustion system is arranged in the furnace body, and two ends of the walking beam mechanism are respectively connected with the end parts of the feeding cantilever roller and the discharging cantilever roller, which are positioned in the furnace body.

The furnace body is formed by welding steel plates and reinforcing channel steel. The furnace body is divided into an upper frame body and a lower frame body, so that the components such as a transmission mechanism, a fan system and the like are ensured to bear enough strength and minimum vibration. All steel structural members are subjected to rust prevention treatment before welding. In order to facilitate transportation, the whole furnace body is manufactured in two sections, and the furnace body is disassembled, transported and then is assembled for the second time on the site of a user.

Furthermore, the bottom of the furnace body is welded with a steel plate to form a bearing layer and a frame structure for supporting the stepping static beam in the furnace, namely the bottom of the frame is welded with channel steel according to the arrangement of the bottom stepping mechanism to form a frame structure for bearing the stepping moving beam outside the furnace.

And a circulating fan is also arranged above the combustion system, the circulating fan is arranged at the top of the furnace body, and the combustion system is arranged at the side part of the furnace body.

Furthermore, a hot air circulation air duct is further arranged at the rear end of the circulating fan, the circulating fan is connected with an inlet of the hot air circulation air duct, and an outlet of the hot air circulation air duct is located at the lower part of the walking beam mechanism in the furnace body. The high-speed rotation of the circulating fan forces the convection of air in the furnace, so that the hot air in the furnace can be ensured to flow uniformly through the workpiece, and the process requirement in the heat treatment process of the workpiece is met. When the furnace works normally, the workpieces are supported, so that hot air can effectively penetrate all the workpieces, and the air quantity is ensured, so that the workpieces in the effective space in the furnace are uniformly heated to achieve the required effect.

The top of the furnace body is welded into an integral structure by adopting channel steel, a plurality of unit areas are separated from the integral structure, steel plates are welded with the channel steel, and a circulating fan inlet is reserved in each unit area.

Further, the combustion system comprises a combustion heating device and a flame protector, wherein the combustion heating device is designed at a position near a backflow port of convection air of each unit area, the flame protector is connected with the heating device, the flame protector is a cylindrical flame protector made of heat-resistant steel materials, and a plurality of flame diffusion holes are formed in the surface of a cylinder body of the flame protector.

Preferably, the feeding furnace door and the discharging furnace door are made of furnace door section steel and are fixed with steel plates at an inlet and an outlet of the furnace body by bolts.

Preferably, the feeding furnace door and the discharging furnace door are steel furnace doors, the furnace doors are lifted and retracted by cylinders, the opening or closing of the furnace doors is pulled by the action of connecting rods, the opening or closing position signals are controlled by magnetic switches on the cylinders, and the lifting conditions of the furnace doors are detected and controlled by a PLC (programmable logic controller) to achieve interlocking control.

Preferably, the furnace body is lined with an inner container, and the inner container consists of a stainless steel inner plate and a refractory fiber layer. The refractory fiber is adhered to the inner side of the stainless steel material in a mode of facing, spraying or smearing and the like. The inner container is installed by welding stainless steel bolt bars on the inner side of the furnace body and fixing the refractory fiber layer and the stainless steel inner plate together with the furnace body by the bolt bars.

The furnace lining adopts stainless steel and a refractory fiber layer as heat insulation materials, is determined according to theoretical calculation and practical experience of working temperature, material service life, pressure generated by combustion of a hearth, surface temperature rise and the like, and ensures that factors such as small shrinkage rate of materials, no peeling, no sinking and the like influence the rise of the temperature of the outer surface of the furnace in the service life cycle.

Preferably, the refractory fiber layer is ceramic fiber wool.

Preferably, feeding cantilever roller and ejection of compact cantilever roller all are equipped with a plurality of V type grooved roll side by side, V type grooved roll all is equipped with V type groove, and every V type grooved roll comprises afterbody and V type groove head, and V type groove head is located the furnace body, and the afterbody is located the furnace body outside and is equipped with the chain, couples together a plurality of V type grooved roll through the chain. The V-shaped groove at the head of the V-shaped groove is used for clamping and placing the bar, and the structure prevents the workpiece from deviating and sliding.

Preferably, the tail part is of a double-bearing structure, and the feeding cantilever roller and the discharging cantilever roller are both rapid independent driving mechanisms and are supported by double bearings.

Further, the feeding cantilever roller is driven by a speed reducing motor; the ejection of compact cantilever roller is driven by two gear motor, and one of them gear motor's speed is faster than another gear motor, and one is quick motor promptly, and another is slow motor, and wherein, the afterbody that is located the outside V type grooved roll of furnace body of ejection of compact cantilever roller is connected respectively in quick motor and slow motor by two chains, divide into quick roller set and slow roller set with a plurality of V type grooved roll, and a plurality of V type grooved roll that are close to walking beam mechanism are slow roller set, and a plurality of V type grooved roll that are close to discharging device are quick roller set. When the bar is moved to the discharging cantilever roller by the walking beam mechanism, the bar passes through the slow roller set and then passes through the fast roller set, so that the distance between the bar close to the discharging furnace door and the back bar is opened when the bar moves to the discharging cantilever roller driven by the fast motor.

Furthermore, the feeding device and the discharging device are respectively composed of a steel frame, a plurality of transmission V-shaped rollers, a chain and a speed reduction motor, and the transmission V-shaped rollers are sequentially arranged to the feeding furnace door or the discharging furnace door from one end far away from the feeding furnace door or the discharging furnace door in parallel; the chain is connected with a speed reducing motor and the transmission V-shaped rollers, and the speed reducing motor drives the transmission V-shaped rollers to roll in sequence through the chain; the transmission V-shaped roller and the speed reducing motor are both arranged on the steel frame; the feeding cantilever roller and the discharging cantilever roller are connected with the transmission V-shaped roller; the V-shaped groove of the V-shaped groove roller of the feeding device and the V-shaped groove of the discharging device are aligned with the V-shaped groove of the V-shaped groove roller of the feeding cantilever roller. So that the bar can smoothly run when entering the feeding furnace door and leaving the discharging furnace door.

Wherein the feeding cantilever roller and the discharging cantilever roller are connected with the driving V-shaped roller, and the V-shaped groove head of the V-shaped groove roller of the feeding cantilever roller and the discharging cantilever roller is connected with the driving V-shaped roller through a chain.

Preferably, photoelectric signal switches are arranged on roller ways of the transmission V-shaped rollers of the feeding device and the discharging device, and are electrically connected with a control system to control the starting, the positioning and the stopping of the transmission V-shaped rollers.

The number of the transmission V-shaped rollers of the feeding device and the discharging device is 2 or more than 2, and the transmission V-shaped rollers can be customized according to the size of the bar; the number of the V-shaped groove rollers of the feeding cantilever roller and the discharging cantilever roller is 2 or more than 2, and the V-shaped groove rollers can be customized according to the size of the bar; the number ratio of the transmission V-shaped rollers of the feeding device to the V-shaped groove rollers of the feeding cantilever roller is not limited, and the number of the transmission V-shaped rollers of the feeding device can be larger than, equal to or smaller than the number of the V-shaped groove rollers of the feeding cantilever roller; the number ratio of the transmission V-shaped rollers of the discharging device to the V-shaped groove rollers of the discharging cantilever roller is not limited, and the number of the transmission V-shaped rollers of the discharging device can be larger than, equal to or smaller than the number of the V-shaped groove rollers of the discharging cantilever roller.

Preferably, under the condition that the feeding device is connected with the feeding furnace door and the discharging device is connected with the discharging furnace door, the feeding device and the discharging device can be positioned on the same side or different sides of the furnace body, namely the feeding furnace door and the discharging furnace door can be positioned on the same side or different sides of the furnace body.

Preferably, the walking beam mechanism comprises a moving beam and a static beam, a moving beam base is arranged below the moving beam, the upper part of the walking beam is connected with a movable saddle through a guide pillar, two ends of the moving beam are connected with an electric push rod, the moving beam base is fixedly arranged on the ground, and an electric rocker arm is connected between the moving beam base and the moving beam; the fixed saddle is connected above the static beam through a guide pillar, and the fixed saddle is fixed in the furnace body and is adjacent to the movable saddle of the movable beam. Wherein the electric push rod drives the movable beam to do horizontal motion, and the electric rocker arm drives the movable beam to do lifting motion.

The number of the guide columns above the movable beam base is equal to that of the movable saddles, and the number of the guide columns is customized according to the size of the bar; the number of the guide columns above the static beam is equal to that of the fixed saddles, and the number of the guide columns above the static beam is customized according to the size of the bar; the number of fixed saddles is equal to the number of movable saddles.

The movable beam can do lifting and transverse moving actions, when the movable saddle is lifted to a specified height, the electric push rod acts to horizontally move the movable beam, drive the movable saddle to enable the workpieces in the furnace to completely move forward by one station and then fall down, the workpieces are placed on the fixed saddle of the fixed beam, the movable saddle falls down and is then drawn back to the original position, and the workpieces are repeatedly and continuously moved forward in the furnace.

Preferably, the electric rocker arm in the walking beam mechanism is controlled by two groups of push rods of a single group of motors to act synchronously, the stroke of the electric rocker arm in a pushing and pulling mode is controlled through a stroke switch so as to control the lifting height, a proximity switch is adopted to ensure the safety stroke, and the safety of the walking beam mechanism is guaranteed.

Further, the electric push rod in the walking beam mechanism operates in the following manner: the movable beam is moved to move forwards and backwards by adopting the stroke of pushing and pulling the electric push rod, the stroke of pushing and pulling the electric push rod is controlled by the stroke switch, and the safety stroke is ensured by adopting the proximity switch, so that the safety of the stepping steel structure is ensured. Wherein the electric push rod is driven by a motor.

The operation of the walking beam mechanism is the key of the operation of the whole equipment, and the movement of the bar in the furnace is completely completed by the operation of the walking beam mechanism. The programs of the electric rocker arm and the two electric push rods cooperate with each other, logic distribution is realized, and the safety of the instrument is guaranteed. In the actual operation process, whether the functions of all the switch buttons are complete or not needs to be checked regularly.

Furthermore, the stepping preheating furnace also comprises a limiting device, wherein the limiting device is a pneumatic positioning device and consists of a cylinder, a guide pipe, a push rod and a signal switch; the cylinder and the ejector rod are nested in the guide pipe; one end of the ejector rod, which is far away from the cylinder, extends into the furnace body; one end of the guide pipe, which is far away from the ejector rod, is positioned outside the furnace body and is opposite to the signal switch.

Has the advantages that: the utility model discloses a marching type preheater is difficult to drop at the in-process rod in the use, and the rod transports the mode in the furnace body freely adjustable, has saved interior space of stove greatly, and this preheater does not use chain and charging tray simultaneously, and difficult messenger's part produces the loss because of rapid cooling and rapid heating, reduction in production cost.

Drawings

FIG. 1 is a front view of a walking beam preheater;

FIG. 2 is a top view of a step preheat furnace;

FIG. 3 is a schematic structural view of the connection of the discharging device and the furnace body, in which the discharging furnace door is positioned at the left side of the furnace body;

FIG. 4 is a schematic structural view of the connection of the feeding device and the furnace body, in which the feeding furnace door is located at the right side of the furnace body;

FIG. 5 is a front view of the discharge boom roller, wherein the direction indicated by the arrow is the direction of travel of the bar;

FIG. 6 is a top view of the discharge cantilever roller, wherein the direction indicated by the arrow is the direction of travel of the bar;

fig. 7 is a schematic structural diagram of a single V-shaped driving roller of the feeding cantilever roller and a single V-shaped groove roller of the discharging cantilever roller.

Detailed Description

The technical solution of the present invention will be explained in detail below.

As shown in figures 1 and 2, bars 11 are gathered and arranged on a feeding device 6 outside a furnace body 1, after arrangement and placement, a feeding furnace door 8 is opened, a speed reducing motor of the feeding device 6 drives a transmission V-shaped roller to roll through a chain, a feeding cantilever roller 2 rolls simultaneously, the bars 11 are brought into the furnace body 1 from the outside of the furnace body 1 and collide against a limiting device 12 arranged on the inner side wall of the furnace body 1 at the tail end of the inner end of the feeding cantilever roller 2, an air cylinder on the limiting device 12 is retracted, the starting point of the bars 11 is positioned, then a walking beam mechanism 5 starts to move in a stepping mode according to beat time, meanwhile, a combustion system 4 preheats the bars 11 in the furnace, in the process, the walking beam mechanism 5 steps the bars 11 entering the furnace from a first station to a discharging cantilever roller 7 of a last station, a discharging furnace door mechanism 8 is opened, and the discharging cantilever roller 7 rolls simultaneously, a row of bars 11 are driven to be output to a discharging device 10 outside the furnace, a speed reducing motor 13 of the discharging device 10 drives a transmission V-shaped roller to roll through a chain, and the bars 11 are provided for a user to enter the next working procedure.

As the preferred embodiment, the feeding device 6 is made up of steel frame, driving V-roller, link chain and gear motor, the gear motor couples to user's logistics control center, the bar 11 to be treated is transferred to the stove through the driving V-roller, the feeding cantilever roller 2 in the driving V-roller stove couples to at the same time, when the bar 11 is brought into the stove 1 and bumped on the stop device 12 installed on the stove 1 inside wall of the stove of the end of the furnace inner end of the feeding cantilever roller 2, the feeding signal produced is transmitted to the logistics control center, make the bar 11 enter the designated position in the stove automatically, namely on the walking beam mechanism 5.

As a preferred embodiment, the limiting device 12 is arranged on the inner side wall of the furnace body 1 at the tail end of the furnace inner end of the feeding cantilever roller 2, is close to the feeding furnace door 8, and consists of a cylinder, a guide pipe, a mandril and a signal switch; the cylinder and the ejector rod are nested in the guide pipe; one end of the ejector rod, which is far away from the cylinder, extends into the furnace body 1; one end of the guide pipe, which is far away from the mandril, is positioned outside the furnace body 1 and is opposite to the signal switch. When the bar 11 hits the top rod, the top rod pushes the guide pipe, the guide pipe touches a signal switch outside the furnace body 1, and a signal is transmitted to a logistics control center of a user, so that the starting point of the bar 11 is positioned, and the walking beam mechanism 5 is controlled to start to operate. The limiting device 12 ensures the accuracy of the running position of the bar in the furnace, limits the distance of the end face of the bar to have a certain safe distance to the furnace wall, and the cylinder of the limiting device 12 does stepping running through the stepping beam mechanism 5 after retracting, so that the friction between the bar 11 and the ejector rod is avoided, the ascending and the translation resistance is formed, and the stable running of the bar 11 is ensured.

As shown in figure 7, as a preferred embodiment, the feeding cantilever roller 2 is a combination of a plurality of V-shaped grooved rollers arranged side by side and used for clamping and placing the bar, each V-shaped grooved roller is composed of a tail part 28 and a V-shaped groove head part 29, the V-shaped groove head part 29 is positioned in the furnace body, the tail part 28 is positioned outside the furnace body and is provided with a chain, and the V-shaped grooved rollers are connected through the chain. The tail part 28 of the V-shaped groove roller of the feeding cantilever roller 2 is a double bearing 27 and a steel frame support 26, the head part 29 of the V-shaped groove is a conveying roller way which is singled out on one side, the double bearing 27 is positioned outside the furnace body 1, and the horizontal height of the feeding cantilever roller can be adjusted. Because under the simultaneous action of gravity and high temperature, the conveying roller way stress time overlength that unilateral was chosen leads to crooked easily, in order to guarantee that rod 11 is the shortest on the feeding cantilever roller, is difficult for causing the crooked feeding cantilever roller of cantilever roller to adopt the quick independent drive of a motor, with the quick whole walking beam mechanism 5 department that shifts the furnace body 1 of arranging the good rod 11 outside the furnace body 1.

As a preferred embodiment, in order to make the bar 11 run inside the furnace body 1, the walking beam mechanism 5 is composed of a movable beam 14 and a fixed beam 15, the movable beam 14 is provided with a movable beam base 16, a movable saddle 17 and electric push rods 18 connected to both ends of the movable beam base 17, the movable beam base 16 is fixedly mounted on the ground, an electric rocker arm 19 is connected between the movable beam base 16 and the movable beam, the electric push rods 18 and the electric rocker arm 19 are driven by a motor, the electric push rods 18 drive the movable beam 14 to horizontally move, the electric rocker arm 19 drives the movable beam 14 to lift, a plurality of guide posts 20 are arranged on the upper part of the movable beam 14, and the upper parts of the guide posts 20 are connected with the; the static beam 15 is provided with a fixed saddle 21, and the fixed saddle 21 is fixed inside the furnace body and is adjacent to the movable saddle 17 of the movable beam 14. The movable beam 14 is lifted and moved transversely, when the movable saddle 17 is lifted to a designated height, the electric push rod 18 is operated to horizontally move the movable beam 14 to drive the movable saddle 17 to move the workpieces in the furnace forward by one station and then fall down, the workpieces are placed on the fixed saddle 21 of the fixed beam 15, the movable saddle 17 falls down and is drawn back to the original position, and the workpieces are continuously moved forward in the furnace in cycles. The electric rocker arm 19 in the walking beam mechanism 5 is controlled by two groups of push rods of a single group of motors to act synchronously, the stroke of the electric rocker arm 19 in a pushing and pulling mode is controlled through a stroke switch so as to control the lifting height, a proximity switch is adopted to ensure the safety stroke, and the safety of a walking steel structure is guaranteed. The electric push rod 18 in the walking beam mechanism 5 operates in the following manner: the movable beam is moved to move forwards and backwards by adopting the pushing and pulling stroke of the electric push rod 18, the pushing and pulling stroke of the electric push rod 18 is controlled by a stroke switch, and the safety stroke is ensured by adopting a proximity switch, so that the safety of the stepping steel structure is ensured.

As shown in fig. 5 to 7, as a preferred embodiment, the bar 11 is transported to the inner end of the discharging cantilever roller 7 through the walking beam mechanism 5, the discharging cantilever roller 7 is a combination of a plurality of V-shaped groove rollers arranged side by side for clamping and placing the bar, each V-shaped groove roller is composed of a tail 28 and a V-shaped groove head 29, the V-shaped groove head 29 is located in the furnace body, the tail 28 is located outside the furnace body 1 and is provided with a chain, and the V-shaped groove rollers are connected through the chain. The tail part of the V-shaped groove roller of the feeding cantilever roller 2 is supported by a double bearing 27 and a steel frame 26, the head part 29 of the V-shaped groove is a conveying roller way which is singled out on one side, the double bearing 27 is positioned outside the furnace body 1, and the horizontal height of the feeding cantilever roller can be adjusted. The V-shaped groove roller combination is driven by two speed reducing motors, wherein one speed reducing motor has a higher speed than the other speed reducing motor, namely one speed reducing motor is a fast motor 22, and the other speed reducing motor is a slow motor 23, so that when a bar close to a discharging furnace door 9 runs to a discharging cantilever roller driven by the fast motor, the bar can be separated from the back bar; particularly, the rod moves on the last station of the movable saddle 17 in the walking beam mechanism 5 during the ejection of compact, and then transfer to ejection of compact cantilever roller 7, during the ejection of compact, two gear motor of ejection of compact cantilever roller 7 drive rod 11 simultaneously, the first rod that is close to ejection of compact furnace gate 9 moves the roller set 25 that slow motor 23 drove earlier, then when the quick roller set 24 that drives through quick motor 22, first rod will pull open the certain distance with the rod at the back, continue to move to being located outside the furnace body 1, the roller table of the ejection of compact cantilever roller 7 that is driven by the faster gear motor of speed, thoroughly pull open the distance with its preceding rod. After separation, the quick motor 22 and the slow motor 23 of the discharge cantilever roller 7 drive the discharge cantilever roller 7 in the furnace to rotate reversely, and then the bar materials which do not need to be discharged are returned to the furnace for continuous heat preservation. The speed of the speed reducer plays a role in distributing single discharged materials, and the frequency of discharged materials is effectively controlled. The speed reduction motor drives the bar 11 to run out and enter the next procedure, so that the bar 11 is not required to be placed on the cantilever roller for a long time, and the cantilever roller cannot be bent.

As a preferred embodiment, after the rod 11 runs into the furnace body 1, the rod is preheated by the combustion system 4, the combustion system 4 is composed of a combustion heating device and a flame protector, wherein the combustion heating device is designed at a position near a backflow port of convection air of each unit area, the flame protector is connected with the heating device, the flame protector is a cylindrical flame protector made of heat-resistant steel materials, and the surface of the cylinder body of the flame protector is provided with a plurality of flame diffusion holes.

The combustion heating device as the preferred embodiment adopts a German Krom sub high-speed burner, an intelligent burner controller, an intelligent air electric actuator, a gas electromagnetic valve, an air/gas proportional valve, an ignition transformer, flame monitoring and the like, and realizes a large/small flame proportional combustion control mode through a high-precision intelligent temperature controller. A voltage stabilizing system with super-cluster performance is arranged, and Germany Krom is adopted in the system design and has excellent-performance elements: the gas filter GFK of 50um of polypropylene filter core, steady voltage control accuracy < + > -0.05 kPa to can realize zero VGBF surge damping valve, safe and reliable, safe bleed valve VSBV and take the quick dump valve VK of position feedback that cut off. Automatic pressure measurement and regulation of a gas main pipe, and emergency shutoff: when the gas is under-voltage, over-voltage, fan failure and sudden power failure, the natural gas supply can be immediately cut off and the alarm is given out, thus ensuring the safe production. The automatic shut-off valve can be operated by hand at the same time.

As a preferred embodiment, in the process that the rod 11 is preheated by the combustion system 4, the circulating fan 3 is further arranged above the combustion system 4, the circulating fan 3 is mounted at the top of the furnace body 1, the rear end of the circulating fan 3 is further provided with a hot air circulating air duct, the circulating fan 3 is connected with an inlet of the hot air circulating air duct, and an outlet of the hot air circulating air duct is located at the lower part of the walking beam mechanism 5 in the furnace body 1. The circulating fan is provided with a fan impeller and is made of 321 stainless steel materials in a processing mode. The fan impeller of the circulating fan 3 rotates at high speed to force the convection of the air in the furnace body 1, so that the hot air in the furnace can be ensured to flow through the bar 11 uniformly, and the process requirement in the heat treatment process of the bar 11 is met. During normal operation, because rod 11 is supported by walking beam mechanism 5, feeding cantilever roller 2 and ejection of compact cantilever roller 7, can make hot-blast whole that pierces through rod 11 effectively, because the amount of wind guarantees, make the interior effective space's of stove interior rod 11 thermally equivalent reach required effect like this.

In order to solve the problems of heat dissipation and energy consumption of the furnace body 1 during the transportation and preheating of the bars 11, the furnace body 1 is lined with an inner container which is composed of a stainless steel inner plate and a refractory fiber layer. The refractory fiber is adhered to the inner side of the stainless steel material in a mode of facing, spraying or smearing and the like. The inner container of the furnace body 1 is made of SUS 3042 mm stainless steel material, stainless steel bolt rods are welded on the inner side of the furnace shell, and the refractory fiber, the stainless steel inner plate and the furnace shell are fixed together by the bolt rods.

In order to enhance the stability and the supporting capability of the furnace body 1, the furnace body 1 is formed by welding steel plates and reinforcing steel channels. The furnace body is divided into an upper frame body and a lower frame body, so that the components such as a transmission mechanism, a fan system and the like are ensured to bear enough strength and minimum vibration. All steel structural members are subjected to rust prevention treatment before welding. In order to facilitate transportation, the whole furnace body is manufactured in two sections, and the furnace body is disassembled, transported and then is assembled for the second time on the site of a user. The side surface of the furnace body is reinforced by vertical channel steel according to equal divisions of the positions of other parts on the corresponding furnace body 1, and the side plate of the side surface of the furnace body is welded with the vertical channel steel by a Q235 high-quality steel plate with the thickness of 5 mm. The vertical channel steel on the side surface of the furnace body is connected with the bottom channel steel, and a stepping mechanism space with the height of 830mm is formed. The bottom of the furnace body is welded by 12# channel steel and a Q235 steel plate with the thickness of 5mm to form a frame structure for bearing the insulating layer and the stepping static beam 15 in the furnace; the bottom of the frame adopts 12# channel steel and is welded according to the arrangement of the bottom walking beam mechanism 5 to form a frame structure for bearing the walking beam mechanism 5 outside the furnace body 1. The top of the furnace body is welded into an integral structure by adopting 12# channel steel in a plurality of units, a Q235 high-quality steel plate with the thickness of 5mm is welded with the structural steel, an inlet of a circulating fan 3 is reserved in each temperature area, and the periphery of the inlet is doubly reinforced by adopting 12# channel steel to ensure that the fan operates stably; the furnace top is provided with a ladder stand and a platform, and the periphery of the furnace top is provided with safety protective guards. The feeding furnace door 8 and the discharging furnace door 9 are installed on the furnace body 1, the feeding furnace door 8 and the discharging furnace door 9 are fixed by bolts through steel plates with the thickness of 12mm and furnace door section steel, the furnace door adopts cylinder lifting and shrinking to pull the door to open or close through the action of a connecting rod, a position signal for opening or closing the door is controlled by a magnetic switch on the cylinder, and the lifting or opening condition of the furnace door is detected and controlled through a PLC (programmable logic controller) to achieve interlocking control.

Claims (9)

1. A stepping preheating furnace is characterized by comprising a furnace body (1), a feeding furnace door (8), a feeding device (6), a feeding cantilever roller (2), a discharging furnace door (9), a discharging device (10), a discharging cantilever roller (7), a combustion system (4) and a stepping beam mechanism (5); one end of the feeding cantilever roller (2) is positioned in the furnace body (1), the other end of the feeding cantilever roller is positioned outside the furnace body (1), and the feeding cantilever roller is arranged along the adjacent side of the feeding furnace door (8) from the feeding furnace door (8); the feeding device (6) is positioned outside the feeding furnace door (8) and penetrates through the feeding furnace door (8) to be connected with one end of the feeding cantilever roller (2) positioned in the furnace body (1); one end of the discharging cantilever roller (7) is positioned in the furnace body (1), the other end of the discharging cantilever roller is positioned outside the furnace body (1), and the discharging cantilever roller is arranged along the adjacent side of the discharging furnace door (9) from the discharging furnace door (9); the discharging device (10) is positioned outside the discharging furnace door (9) and penetrates through the discharging furnace door (9) to be connected with one end of the discharging cantilever roller (7) positioned in the furnace body (1); the combustion system (4) is arranged in the furnace body (1), and the two ends of the walking beam mechanism (5) are respectively connected with the end parts of the feeding cantilever roller (2) and the discharging cantilever roller (7) which are positioned in the furnace body (1).

2. The step preheating furnace according to claim 1, wherein: the circulating fan (3) is further arranged above the combustion system (4), the circulating fan (3) is installed at the top of the furnace body (1), and the combustion system (4) is installed on the side portion of the furnace body (1).

3. The step preheating furnace according to claim 2, wherein: the rear end of the circulating fan (3) is also provided with a hot air circulating air duct, the circulating fan (3) is connected with an inlet of the hot air circulating air duct, and an outlet of the hot air circulating air duct is positioned at the lower part of the walking beam mechanism (5) in the furnace body (1).

4. The step preheating furnace according to claim 1, wherein: the furnace body (1) is lined with an inner container, and the inner container consists of a stainless steel inner plate and a refractory fiber layer.

5. The step preheating furnace according to claim 1, wherein: feeding cantilever roller (2) and ejection of compact cantilever roller (7) all are equipped with a plurality of V type groove rollers side by side, V type groove roller all is equipped with V type groove, and every V type groove roller comprises afterbody (28) and V type groove head (29), and V type groove head (29) are in furnace body (1), and afterbody (28) are located furnace body (1) outside and are equipped with the chain, couple together a plurality of V type groove rollers through the chain.

6. The step preheating furnace according to claim 5, wherein: the feeding cantilever roller (2) is driven by a speed reducing motor; ejection of compact cantilever roller (7) are driven by two gear motor, one is fast motor (22), another is slow motor (23), wherein, the afterbody (28) that is located the outside V type grooved roll of furnace body (1) of ejection of compact cantilever roller (7), connect respectively in fast motor (22) and slow motor (23) by two chains, divide into quick roller set (24) and slow roller set (25) with a plurality of V type grooved roll, a plurality of V type grooved roll that are close to walking beam mechanism (5) are slow roller set (25), a plurality of V type grooved roll that are close to discharging device (10) are quick roller set (24).

7. The step preheating furnace according to claim 1, wherein: the feeding device (6) and the discharging device (10) are respectively composed of a steel frame, a plurality of transmission V-shaped rollers, a chain and a speed reducing motor, and the transmission V-shaped rollers are sequentially arranged to the feeding furnace door (8) or the discharging furnace door (9) from one end far away from the feeding furnace door (8) or the discharging furnace door (9) in parallel; the chain is connected with a speed reducing motor and the transmission V-shaped rollers, and the speed reducing motor drives the transmission V-shaped rollers to roll in sequence through the chain; the transmission V-shaped roller and the speed reducing motor are both arranged on the steel frame; feeding cantilever roller (2) and ejection of compact cantilever roller (7) are connected with transmission V type roller, the transmission V type roller of feed arrangement (6) and discharging device (10) all is equipped with V type groove, the V type groove of feed arrangement (6) transmission V type roller aligns with the V type groove of feeding cantilever roller (2) V type groove roller, the V type groove of discharging device (10) transmission V type roller aligns with the V type groove of ejection of compact cantilever roller (7) V type groove roller.

8. The step preheating furnace according to claim 1, wherein: the walking beam mechanism (5) comprises a moving beam (14) and a static beam (15), a moving beam base (16) is arranged below the moving beam (14), a movable saddle (17) is connected above the moving beam (14) through a guide pillar (20), two ends of the moving beam (14) are connected with an electric push rod (18), the moving beam base (16) is fixedly arranged on the ground, an electric rocker arm (19) is connected between the moving beam base (16) and the moving beam (14), the electric push rod (18) drives the moving beam (14) to horizontally move, and the electric rocker arm (19) drives the moving beam (14) to lift; the upper part of the static beam (15) is connected with a fixed saddle (21) through a guide post (20), and the fixed saddle (21) is fixed in the furnace body (1) and is adjacent to the movable saddle (17) of the movable beam (14).

9. The step preheating furnace according to claim 1, wherein: the furnace body is characterized by further comprising a limiting device (12) arranged on the inner side wall of the furnace body (1) at the tail end of the inner end of the feeding cantilever roller (2), wherein the limiting device (12) is a pneumatic positioning device and consists of a cylinder, a guide pipe, a push rod and a signal switch; the cylinder and the ejector rod are nested in the guide pipe; one end of the ejector rod, which is far away from the cylinder, extends into the furnace body (1); one end of the guide pipe, which is far away from the mandril, is positioned outside the furnace body (1) and is opposite to the signal switch.

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