CN213454929U - Sintering kiln furniture with waste heat recovery function - Google Patents

Abstract

The utility model discloses a sintering kiln furniture with a waste heat recovery function, which comprises a mounting plate, an adsorption filtering structure and a waste heat utilization structure; mounting a plate: the sintering case is arranged on the left side of the upper surface of the sintering case, the front side face of the sintering case is of an open structure, the left end of the front side face of the sintering case is hinged to the right side face of the sintering case door through a hinge, the sintering case door corresponds to the open position of the front side face of the sintering case, the inside of the sintering case is provided with kiln furniture plates which are evenly and transversely distributed, the left side of the upper surface of the mounting plate is provided with a draught fan, the air outlet of the right side face bottom of the sintering case is connected with the air inlet of the draught fan through an air suction pipe, the upper surface of the mounting plate is provided with an adsorption case, the air outlet of the draught fan is connected with the air inlet of the left side face bottom of the adsorption case through an air outlet pipe, the front side face of.

Description

Sintering kiln furniture with waste heat recovery function

Technical Field

The utility model relates to a waste heat recovery technical field specifically is a sintering kiln furniture with waste heat recovery function.

Background

Sintering, which means to convert a powdery material into a compact, is a traditional process, and people have long utilized the process to produce ceramics, powder metallurgy, refractory materials, ultra-high temperature materials and the like, generally speaking, after powder is formed, the compact obtained by sintering is a polycrystalline material, the microstructure of which consists of crystals, glass bodies and air holes, the sintering process directly affects the grain size, the air hole size and the shape and distribution of crystal boundary in the microstructure, and further affects the performance of the materials, kiln furniture, namely, appliances which are made of refractory earth and play roles of spacing, supporting, bearing and protecting blanks in the roasting process, at present, sintering kiln furniture for recovering waste heat cannot fully contact activated carbon particles with waste heat air, cannot completely adsorb impurities in the air, and cannot avoid secondary pollution when the waste heat is used, the circulation that can not realize the active carbon granule flows, and structural design is loaded down with trivial details, can not realize even heating and heat preservation with the water source, can't rationalize and utilize waste heat resource, can not realize the make full use of to the waste heat, reduces the utilization ratio to the resource, consequently is imperative for solving the realization of a sintering kiln utensil with waste heat recovery function of this type of problem.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, provide a sintering kiln furniture with waste heat recovery function, cause secondary pollution when avoiding using the waste heat, rationalize and utilize waste heat resource, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: a sintering kiln furniture with a waste heat recovery function comprises a mounting plate, an adsorption filtering structure and a waste heat utilization structure;

mounting a plate: the left side of the upper surface of the sintering box is provided with the sintering box, the front side surface of the sintering box is of an open structure, the left end of the front side surface of the sintering box is hinged with the right side surface of the sintering box door through a hinge, the sintering box door corresponds to the open position of the front side surface of the sintering box, kiln furniture plates which are uniformly and transversely distributed are arranged inside the sintering box, the left side of the upper surface of the mounting plate is provided with a draught fan, an air outlet at the bottom end of the right side surface of the sintering box is connected with an air inlet of the draught fan through an air suction pipe, the upper surface of the mounting plate is provided with an adsorption box, an air outlet at the bottom end of the draught fan is connected with an air inlet at the bottom end of the left side surface of the adsorption box through an air outlet pipe, the front side surface of the adsorption box is provided with a motor, the right side surface of the mounting plate is provided, the heating box door corresponds to the opening position of the top end of the heating box;

an adsorption filtration structure: the rear end of the output shaft of the motor is fixedly connected with the front side surface of the adsorption filtering structure;

the waste heat utilization structure is as follows: arranged inside the heating box;

wherein: still include control switch group, control switch group sets up the upper surface in the mounting panel, external power source is connected to control switch group's input electricity, the equal electric connection control switch group's of input output of motor and draught fan output, fully make active carbon particle and waste heat air contact, impurity among the adsorbed air, cause secondary pollution when avoiding using the waste heat, realize the circulation flow of active carbon particle, and reasonable design, realize even heating and heat preservation with the water source, rationalize and utilize waste heat resources, realize the make full use of to the waste heat, the at utmost utilizes the resource.

Further, the adsorption and filtration structure comprises a conveyor belt, a fixed plate, stirring pieces, a rotating shaft and activated carbon particles, wherein the rotating shaft is longitudinally and rotatably connected with the inside of the adsorption box through a bearing, the rear end of an output shaft of a motor penetrates through a shaft hole of a sealing bearing on the front side surface of the adsorption box and is fixedly connected with the front end of the left rotating shaft, the vertical fixed plate is arranged inside the adsorption box, the rotating shaft is respectively and rotatably connected with the shaft holes of the sealing bearings which are symmetrically distributed in the middle of the fixed plate in a left-right mode, the two rotating shafts are driven by the conveyor belt, the stirring pieces are arranged on the outer arc surfaces of the rotating shafts, the stirring pieces are positioned between the rear side surface of the fixed plate and the inner wall of the rear side of the adsorption box, the rotating directions of the two stirring pieces are opposite, the activated carbon particles which are uniformly distributed, adsorb the impurity in the air, cause secondary pollution when avoiding using the waste heat.

Further, adsorb filtration and still include water conservancy diversion hole and baffle, the baffle vertically sets up in the inside of adsorption tank, the leading flank of baffle and the trailing flank fixed connection of fixed plate, and both ends all are equipped with evenly distributed's water conservancy diversion hole around the middle part of baffle, realize the circulation flow of active carbon granule, and structural design is reasonable.

Further, the waste heat utilization structure includes chuck, annular heat pipe, cask, water injection hole and handle, the lug of chuck bottom sets up in the inside bottom of heating cabinet, and the upper surface joint of chuck has the cask, and the water inlet department of cask upper surface is equipped with the water injection hole, and the upper surface of cask is equipped with bilateral symmetry distribution's handle, and the left side inner wall of heating cabinet is equipped with annular heat pipe, and the air intake of annular heat pipe links to each other with the air intake of heating cabinet left surface bottom, and the extrados contact of intrados of annular heat pipe and cask realizes even heating and heat preservation with the water source, rationally utilizes waste heat resources.

Furthermore, the front side of the heating box is provided with a U-shaped rod, so that the waste heat is fully utilized, and resources are utilized to the maximum extent.

Compared with the prior art, the beneficial effects of the utility model are that: this sintering kiln furniture with waste heat recovery function has following benefit:

1. the motor is controlled to start working by controlling the switch group, the motor drives the rotating shaft on the left side to start rotating clockwise, because the two rotating shafts are driven by the conveyor belt, the rotating shaft on the right side is driven to rotate clockwise, further drives the stirring sheets to start stirring the filled active carbon particles, and simultaneously, because the rotating directions of the two stirring sheets are opposite, therefore, the left stirring sheet drives the activated carbon particles to start moving to the rear side of the adsorption box, the right stirring sheet drives the activated carbon particles to start moving to the front side of the adsorption box, and the active carbon granule realizes at the inside circulation flow of adsorption tank through baffle middle part front and back both ends evenly distributed's water conservancy diversion hole, makes active carbon granule and the hot-blast abundant contact that carries on of circulation, realizes the rational use to the waste heat, prevents that the harmful gas that produces from causing the pollution to the environment among the sintering process.

2. Adsorb hot-blast process annular heat pipe of accomplishing and begin to heat the cask and heat up, unnecessary hot-blast air outlet through annular heat pipe accesss to the inside to the heating cabinet, warm water to the heating carries out heat preservation, simultaneously unnecessary hot-blast air outlet circulation through heating cabinet leading flank evenly distributed to the external world, hang the object that will dry with on the U-shaped pole, the realization is to the reuse of waste heat, after the recovery is accomplished, open the heating chamber door, utilize handle with cask and chuck cancellation joint, take out the water yield of heating completion, use, easy operation is convenient, the at utmost utilizes waste heat resources, prevent that the resource from causing the waste.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic view of the adsorption filtration structure of the present invention;

FIG. 4 is a schematic view of the waste heat utilization structure of the present invention;

FIG. 5 is a schematic view of the connecting tube structure of the present invention;

fig. 6 is the schematic view of the air outlet pipe structure of the present invention.

In the figure: the device comprises a mounting plate 1, a control switch group 2, an adsorption and filtration structure 3, a conveyor belt 31, a fixing plate 32, a diversion hole 33, a partition plate 34, a stirring sheet 35, a rotating shaft 36, activated carbon particles 37, a residual heat utilization structure 4, a chuck 41, an annular heat conduction pipe 42, a bucket 43, a water injection hole 44, a handle 45, a heating box door 5, a U-shaped rod 6, a heating box 7, a connecting pipe 8, an adsorption box 9, a motor 10, an air outlet pipe 11, an induced draft fan 12, an air suction pipe 13, a sintering box 14, a kiln tool plate 15 and a sintering box door 16.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a sintering kiln furniture with a waste heat recovery function comprises a mounting plate 1, an adsorption filtering structure 3 and a waste heat utilization structure 4;

mounting plate 1: the left side of the upper surface of the sintering box 14 is provided with the sintering box 14, the front side surface of the sintering box 14 is of an open structure, the left end of the front side surface of the sintering box 14 is hinged with the right side surface of a sintering box door 16 through a hinge, the sintering box door 16 corresponds to the open position of the front side surface of the sintering box 14, kiln furniture plates 15 which are uniformly and transversely distributed are arranged inside the sintering box 14, the left side of the upper surface of a mounting plate 1 is provided with an induced draft fan 12, an air outlet at the bottom end of the right side surface of the sintering box 14 is connected with an air inlet of the induced draft fan 12 through an air draft tube 13, the upper surface of the mounting plate 1 is provided with an adsorption box 9, an air outlet of the induced draft fan 12 is connected with an air inlet at the bottom end of the left side surface of the adsorption box 9 through an air outlet tube 11, the front side surface of, the top end of the heating box 7 is of an open structure, the right side of the upper surface of the heating box 7 is hinged with the left side surface of a heating box door 5 through a hinge, the heating box door 5 corresponds to the open position of the top end of the heating box 7, an installing plate 1 is fixedly installed on a proper horizontal working ground through installing holes symmetrically distributed at four corners of the installing plate 1 by using external bolts, blanks to be sintered are placed in kiln furniture uniformly distributed on the upper surface of a kiln furniture plate 15, at the moment, a box door handle lock in the installing hole on the left side wall of the sintering box door 16 is matched and installed with a lock ring in the installing hole on the right end of the front side surface of the sintering box 14, the sintering box door 16 is locked, a valve connected in series in a heat inlet pipe on the upper surface of the sintering box 14 is opened, external sintering equipment is connected with the heat inlet pipe on the upper surface of the sintering box 14, the blanks are sintered, after sintering is finished, external equipment stops supplying heat to the interior of a sintering box 14, a valve connected in series in a heat inlet pipe on the upper surface of the sintering box 14 is closed, an induced draft fan 12 is controlled to start working, residual heat in the sintering box 14 is conveyed into an adsorption box 9 through an air suction pipe 13 and an air outlet pipe 11, adsorption treatment is started on harmful gas in the residual heat, hot air after adsorption is fed into a heating box 7 through a connecting pipe 8, and a box door handle lock in a mounting hole in the right side wall of a heating box door 5 is matched with a lock ring in a mounting hole in the left end of the upper surface of the heating box 7 to lock the heating box door 5;

adsorption filtration structure 3: the adsorption box is arranged in the adsorption box 9, the rear end of an output shaft of the motor 10 is fixedly connected with the front side surface of the adsorption and filtration structure 3, the adsorption and filtration structure 3 comprises a conveyor belt 31, a fixing plate 32, stirring pieces 35, a rotating shaft 36 and activated carbon particles 37, the rotating shaft 36 is longitudinally and rotatably connected with the interior of the adsorption box 9 through bearings, the rear end of the output shaft of the motor 10 penetrates through a shaft hole of a sealing bearing on the front side surface of the adsorption box 9 and is fixedly connected with the front end of the rotating shaft 36 on the left side, the vertical fixing plate 32 is arranged in the adsorption box 9, the rotating shaft 36 is respectively rotatably connected with shaft holes of the sealing bearings symmetrically distributed on the left and right sides in the middle of the fixing plate 32, the two rotating shafts 36 are driven by the conveyor belt 31, the stirring pieces 35 are arranged on the outer arc surface of the rotating shaft 36, the stirring pieces 35 are, activated carbon particles 37 are uniformly distributed and filled between the rear side surface of the fixing plate 32 and the inner wall of the rear side of the adsorption box 9, the adsorption filtration structure 3 further comprises a flow guide hole 33 and a partition plate 34, the partition plate 34 is longitudinally arranged inside the adsorption box 9, the front side surface of the partition plate 34 is fixedly connected with the rear side surface of the fixing plate 32, the front end and the rear end of the middle part of the partition plate 34 are respectively provided with the flow guide hole 33 which are uniformly distributed, the motor 10 is controlled to start working, the motor 10 drives the left rotating shaft 36 to start clockwise rotation, the right rotating shaft 36 is driven to clockwise rotate by the two rotating shafts 36 which are driven by the conveyor belt 31, the stirring pieces 35 are driven to start stirring the filled activated carbon particles 37, and meanwhile, the rotating directions of the two stirring pieces 35 are opposite, so that the left stirring piece 35 drives the activated carbon particles 37 to start moving, the right stirring sheet 35 drives the activated carbon particles 37 to start moving to the front side of the adsorption tank 9, and the activated carbon particles 37 pass through the flow guide holes 33 uniformly distributed at the front end and the rear end of the middle part of the partition plate 34 to realize circular flow in the adsorption tank 9;

waste heat utilization structure 4: set up in the inside of heating cabinet 7, waste heat utilization structure 4 includes chuck 41, annular heat pipe 42, cask 43, water injection hole 44 and handle 45, the lug of chuck 41 bottom sets up in the inside bottom of heating cabinet 7, the upper surface joint of chuck 41 has cask 43, the water inlet department of cask 43 upper surface is equipped with water injection hole 44, the upper surface of cask 43 is equipped with bilateral symmetry's handle 45, the left side inner wall of heating cabinet 7 is equipped with annular heat pipe 42, the air intake of annular heat pipe 42 is continuous with the air intake of heating cabinet 7 left surface bottom, the intrados of annular heat pipe 42 contacts with the extrados of cask 43, add the water source that will heat to the inside of cask 43 through water injection hole 44 in proper amount, hot-blast begins to heat cask 43 through annular heat pipe 42, unnecessary hot-blast leads to the inside to heating cabinet 7 through the air outlet of annular heat pipe 42, the heated warm water is subjected to heat preservation treatment, the water bucket 43 and the chuck 41 are not clamped by the handle 45, and the heated water is taken out for use;

wherein: still include control switch group 2, control switch group 2 sets up in the upper surface of mounting panel 1, and external power source is connected to control switch group 2's input electricity, and the equal electric connection of input of motor 10 and draught fan 12 controls switch group 2's output, and motor 10 realizes the backward flow stirring to active carbon granule 37, and draught fan 12 guides the waste heat and handles the use.

Wherein: the front side of the heating box 7 is provided with the U-shaped rod 6, redundant hot air circulates to the outside through the air outlets uniformly distributed on the front side of the heating box 7, and objects to be dried are hung on the U-shaped rod 6, so that the waste heat is recycled.

When in use: the mounting plate 1 is fixedly arranged on a proper horizontal working ground by using external bolts through mounting holes symmetrically distributed at four corners of the mounting plate 1, a blank to be sintered is placed in kiln furniture uniformly distributed on the upper surface of a kiln furniture plate 15, at the moment, a box door handle lock in a mounting hole on the left side wall of a sintering box door 16 is matched and arranged with a lock ring in a mounting hole on the right end of the front side surface of the sintering box 14, the sintering box door 16 is locked, a valve connected in series in a heat inlet pipe on the upper surface of the sintering box 14 is opened, external sintering equipment is connected with the heat inlet pipe on the upper surface of the sintering box 14, the blank is sintered, the blank is uniformly heated through holes uniformly distributed on the upper surface of the kiln furniture plate 15, after sintering is finished, the external equipment stops supplying heat to the inside of the sintering box 14, the valve connected in series in the heat inlet pipe on the upper surface of the sintering box, residual waste heat in the sintering box 14 is conveyed into the adsorption box 9 through the air suction pipe 13 and the air outlet pipe 11, adsorption treatment of harmful gas in the waste heat is started, the motor 10 is controlled to start working through the control switch group 2, the motor 10 drives the left rotating shaft 36 to start clockwise rotation, the two rotating shafts 36 are driven by the conveyor belt 31, so that the right rotating shaft 36 is driven to also clockwise rotate, the stirring sheet 35 is driven to start stirring the filled activated carbon particles 37, meanwhile, the rotating directions of the two stirring sheets 35 are opposite, so that the left stirring sheet 35 drives the activated carbon particles 37 to start moving towards the rear side of the adsorption box 9, the right stirring sheet 35 drives the activated carbon particles 37 to start moving towards the front side of the adsorption box 9, and the activated carbon particles 37 realize circulating flow in the adsorption box 9 through the flow guide holes 33 uniformly distributed at the front end and the rear end of the middle part of the partition plate 34, the activated carbon particles 37 are fully contacted with the circulating hot air to adsorb harmful substances in the hot air, the hot air after adsorption enters the heating box 7 through the connecting pipe 8 and the annular heat-conducting pipe 42, meanwhile, filter screens are arranged in the pipe bodies of the connecting pipe 8 and the air outlet pipe 11 to prevent the activated carbon particles 37 from randomly scattering, a water source to be heated is properly added into the water bucket 43 through the water injection hole 44, at the moment, a box door handle lock in a mounting hole on the right side wall of the heating box door 5 is matched and mounted with a lock ring in a mounting hole on the left end of the upper surface of the heating box 7 to lock the heating box door 5, the adsorbed hot air starts to heat the water bucket 43 through the annular heat-conducting pipe 42, the redundant hot air is led into the heating box 7 through an air outlet of the annular heat-conducting pipe 42 to carry out heat preservation treatment on the heated warm water, and the redundant hot air is simultaneously circulated to the outside through an air outlet uniformly, hanging an object to be dried on a U-shaped rod 6 to realize reutilization of waste heat, discharging waste heat air adsorbed by the activated carbon particles 37 to the outside of a room safely to avoid pollution to the air, controlling the operation of an induced draft fan 12 and a motor 10 by a control switch group 2 after the inside of a sintering box 14 is completely cooled, opening a heating box door 5, utilizing a handle 45 to remove clamping connection between a water bucket 43 and a chuck 41, taking out the heated water volume for use, and periodically replacing the activated carbon particles 37 inside the adsorption box 9, opening a valve connected in series in a discharge pipe on the rear side surface of the adsorption box 9, controlling the motor 10 to operate by the control switch group 2, conveying the activated carbon particles 37 to the outside under the stirring action of a stirring sheet 35, closing the valve connected in series in the discharge pipe on the rear side surface of the adsorption box 9 after the conveying is finished, opening the valve connected in series in the discharge pipe on the upper surface of the adsorption box 9, adding new active carbon particles 37 into the adsorption tank 9, uniformly filling the active carbon particles 37 into the adsorption tank 9 through the stirring sheet 35, closing a valve connected in series in a feed pipe on the upper surface of the adsorption tank 9 after the filling is finished, and controlling the motor 10 to stop running through the control switch group 2 to finish the replacement of the active carbon particles 37.

It is to be noted that the motor 10 disclosed in this embodiment may be a motor of 5IK150RGU-CMF, available from wepont electromechanical limited, dongguan, the induced draft fan 12 may be an induced draft fan of SF2-2, and the control switch group 2 controls the induced draft fan 12 and the motor 10 to operate by a method commonly used in the prior art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a sintering kiln furniture with waste heat recovery function which characterized in that: comprises a mounting plate (1), an adsorption filtering structure (3) and a waste heat utilization structure (4);

mounting plate (1): the left side of the upper surface of the sintering box (14) is provided with the sintering box (14), the front side surface of the sintering box (14) is of an open structure, the left end of the front side surface of the sintering box (14) is hinged with the right side surface of the sintering box door (16) through a hinge, the sintering box door (16) corresponds to the opening position of the front side surface of the sintering box (14), kiln furniture plates (15) which are uniformly and transversely distributed are arranged inside the sintering box (14), the left side of the upper surface of the mounting plate (1) is provided with an induced draft fan (12), an air outlet at the bottom end of the right side surface of the sintering box (14) is connected with an air inlet of the induced draft fan (12) through an air suction pipe (13), the upper surface of the mounting plate (1) is provided with an adsorption box (9), an air outlet of the induced draft fan (12) is connected with an air inlet at the bottom end of the left side surface of the adsorption box (, an air outlet at the bottom end of the right side face of the adsorption box (9) is connected with an air inlet at the bottom end of the left side face of the heating box (7) through a connecting pipe (8), the top end of the heating box (7) is of an open structure, the right side of the upper surface of the heating box (7) is hinged with the left side face of the heating box door (5) through a hinge, and the opening position of the heating box door (5) corresponds to that of the top end of the heating box (7);

adsorption filtration structure (3): the rear end of an output shaft of the motor (10) is fixedly connected with the front side surface of the adsorption filtering structure (3);

waste heat utilization structure (4): is arranged inside the heating box (7);

wherein: still include control switch group (2), control switch group (2) set up in the upper surface of mounting panel (1), and external power source is connected to the input electricity of control switch group (2), and the output of control switch group (2) is connected to the equal electricity of input of motor (10) and draught fan (12).

2. The sintering kiln furniture with the waste heat recovery function as claimed in claim 1, wherein: the adsorption and filtration structure (3) comprises a conveyor belt (31), a fixing plate (32), stirring sheets (35), a rotating shaft (36) and activated carbon particles (37), wherein the rotating shaft (36) is longitudinally and rotatably connected with the inside of an adsorption box (9) through bearings, the rear end of an output shaft of a motor (10) penetrates through a shaft hole of a sealed bearing on the front side surface of the adsorption box (9) and is fixedly connected with the front end of a left rotating shaft (36), the adsorption box (9) is internally provided with a vertical fixing plate (32), the rotating shaft (36) is respectively and rotatably connected with sealed bearing shaft holes which are symmetrically distributed in the middle of the fixing plate (32) in a left-right mode, the two rotating shafts (36) are driven through the conveyor belt (31), the outer arc surfaces of the rotating shafts (36) are respectively provided with the stirring sheets (35), and the stirring sheets (35) are positioned between the rear side surface of the fixing plate, the rotation directions of the two stirring sheets (35) are opposite, and uniformly distributed activated carbon particles (37) are filled between the rear side surface of the fixing plate (32) and the inner wall of the rear side of the adsorption box (9).

3. The sintering kiln furniture with the waste heat recovery function as claimed in claim 2, wherein: adsorb filtration (3) and still include water conservancy diversion hole (33) and baffle (34), baffle (34) vertically set up in the inside of adsorption tank (9), the leading flank of baffle (34) and the trailing flank fixed connection of fixed plate (32), both ends all are equipped with evenly distributed's water conservancy diversion hole (33) around the middle part of baffle (34).

4. The sintering kiln furniture with the waste heat recovery function as claimed in claim 1, wherein: waste heat utilization structure (4) include chuck (41), annular heat pipe (42), cask (43), water injection hole (44) and handle (45), the lug of chuck (41) bottom sets up in the inside bottom of heating cabinet (7), and the upper surface joint of chuck (41) has cask (43), and the water inlet department of cask (43) upper surface is equipped with water injection hole (44), and the upper surface of cask (43) is equipped with handle (45) that bilateral symmetry distributes, and the left side inner wall of heating cabinet (7) is equipped with annular heat pipe (42), and the air intake of annular heat pipe (42) links to each other with the air intake of heating cabinet (7) left surface bottom, and the extrados contact of the intrados of annular heat pipe (42) and cask (43).

5. The sintering kiln furniture with the waste heat recovery function as claimed in claim 1, wherein: the front side surface of the heating box (7) is provided with a U-shaped rod (6).

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