CN110835722B - Sliding sealing furnace door for gear carburizing heat treatment - Google Patents

Sliding sealing furnace door for gear carburizing heat treatment Download PDF

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Publication number
CN110835722B
CN110835722B CN201911185103.9A CN201911185103A CN110835722B CN 110835722 B CN110835722 B CN 110835722B CN 201911185103 A CN201911185103 A CN 201911185103A CN 110835722 B CN110835722 B CN 110835722B
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China
Prior art keywords
sealing
door
ring
furnace
mechanical arm
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CN201911185103.9A
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Chinese (zh)
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CN110835722A (en
Inventor
温祖元
丁世军
韩江孝
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Tenova Technology Tianjin Co Ltd
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Tenova Technology Tianjin Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors

Abstract

The invention provides a sliding seal furnace door for gear carburizing heat treatment, which comprises a door body, a water-cooling door frame, a supporting wheel assembly, a pressing adjusting mechanism and a fixed pulley system, wherein the door body is connected to the outer end of the water-cooling door frame through a grease lubrication sealing layer, a mechanical arm channel for a mechanical arm to pass through is arranged in the middle of the door body, and the supporting wheels of the supporting wheel assembly are connected to the upper end and the lower end of the mechanical arm in a rolling way. The sealing furnace door is matched with the mechanical arm of the tray transfer machine, when the mechanical arm of the inner ring tray transfer machine reciprocates back and forth and reciprocates up and down at high temperature in the furnace, the sealing furnace door is in a sliding state, but can maintain a stable sealing relationship with the water-cooling furnace door frame on the outer wall of the furnace wall and the mechanical arm of the inner ring tray transfer machine, the possibility that air outside the furnace enters the furnace is avoided through the design, the key index IGO of the gear is ensured to reach the national standard, and the technical bottleneck of the application of the large annular rotary bottom type gas carburizing furnace in the gear carburizing heat treatment field is solved.

Description

Sliding sealing furnace door for gear carburizing heat treatment
Technical Field
The invention belongs to the technical field of industrial furnaces, and particularly relates to a sliding seal furnace door for gear carburizing heat treatment.
Background
Gear carburizing heat treatment is typically performed on a well-type gas carburizing furnace. The well type gas carburizing furnace belongs to a gas carburizing furnace for periodic operation. Is suitable for small-batch gear carburizing production operation. The prior production process is mature, and the product quality and performance are stable and reliable. However, with the increase of the market demand of gears, some enterprises have stable orders and large product demand, so the enterprises begin to gradually select a large annular rotary hearth gas carburizing furnace (hereinafter referred to as a large annular rotary hearth gas carburizing furnace) for production. The large annular rotary bottom type gas carburizing furnace is continuous production operation, and the heat treatment yield of the gear is high, but due to the restriction of the structural type of the large annular rotary bottom type gas carburizing furnace, the tightness of the gear is far worse than that of a well type gas carburizing furnace, so that the key performance index IGO (inter-crystal oxidation) of the gear heat treated on the large annular rotary bottom type gas carburizing furnace is difficult to reach the national standard, and the qualification rate of the product is low. In order to improve the qualification rate of products and ensure that the key performance index IGO of gear carburization reaches the national standard, the possibility that air outside the furnace enters the large annular rotary hearth type gas carburizing furnace needs to be reduced.
The invention relates to a sealing furnace door applied to a large annular rotary bottom type gas carburizing furnace. A tray transfer machine is designed on the inner ring side of a large annular rotary bottom type gas carburizing furnace, a mechanical arm hand of the tray transfer machine needs to do actions of transferring a tray to different stations in the furnace, and meanwhile, the carburizing atmosphere in the furnace is isolated from the outside air, so that a sliding sealing furnace door for gear carburizing heat treatment, which is matched with the tray transfer machine, needs to be designed.
The sliding sealing furnace door structure for gear carburizing heat treatment is designed aiming at the motion characteristics of back-and-forth reciprocating motion and up-and-down reciprocating motion of the mechanical arm of the inner ring tray transfer machine at high temperature in the furnace.
The sealing furnace door is matched with the mechanical arm of the tray transfer machine, when the mechanical arm of the inner ring tray transfer machine reciprocates back and forth and reciprocates up and down at high temperature in the furnace, the sealing furnace door is in a sliding state, but can maintain a stable sealing relationship with the water-cooling furnace door frame on the outer wall of the furnace wall and the mechanical arm of the inner ring tray transfer machine, the possibility that air outside the furnace enters the furnace is greatly reduced by the design, the key index IGO of the gear reaches the national standard, and the technical bottleneck of the application of the large annular rotary bottom type gas carburizing furnace in the gear carburizing heat treatment field is solved.
Disclosure of Invention
In view of the above, the present invention aims to propose a sliding seal oven door for gear carburizing heat treatment, which can solve the above-mentioned problems.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the sliding seal furnace door comprises a door body, a water-cooled door frame, supporting wheel assemblies, a pressing adjusting mechanism and a fixed pulley system, wherein the water-cooled door frame is fixed at a starting position port of a channel section of an annular rotary hearth furnace, the door body is connected to the outer end of the water-cooled door frame through a grease lubrication sealing layer, a mechanical arm channel for a mechanical arm to pass through is arranged in the middle of the door body, the supporting wheel assemblies are arranged on the outer side of the door body and are positioned on the upper side and the lower side of the mechanical arm channel, and the supporting wheels assembled by the supporting wheels are connected to the upper end and the lower end of the mechanical arm in a rolling way;
the fixed pulley system is arranged above the channel section of the annular rotary hearth furnace and comprises a fixed pulley, a rope, a counterweight and a bracket, wherein the fixed pulley is arranged on the bracket, the rope bypasses the fixed pulley, one end of the rope is connected with the counterweight, the other end of the rope is connected with the door body, the periphery of the mechanical arm channel of the door body is provided with a sealing unit group, the compression adjusting mechanism is arranged on two sides of the water-cooled door frame, and the frames on two sides of the door body are compressed through the compression adjusting mechanism.
Further, two cavity water jackets are formed in the water-cooling door frame through a plurality of square bar steel, each cavity water jacket is provided with a water inlet and a water outlet, and the water-cooling door frame and the channel sections are sealed through sealing gaskets and fixed through bolts and nuts.
Further, a circle of oil grooves are formed in the frame of the door body, high-temperature lubricating grease is beaten into the oil grooves of the door body through the oil inlets and the oil pipelines on the door body by the centralized lubricating system, and the high-temperature lubricating grease is evenly distributed on the plane where the door body is contacted with the water-cooled door frame through the oil grooves, so that a grease lubricating sealing layer is formed.
Further, the oil grooves on each side of the frame of the door body are of a wavy structure with high and low fluctuation.
Further, the door body comprises a layer of furnace door steel structure wrapped at the periphery and furnace door refractory filled in the furnace door steel structure.
Further, the compression adjusting mechanism comprises a mounting frame, a rotating shaft, a shaft bracket, a steel structure frame, rollers, nuts, a screw rod, a spring, a sleeve and a limiting block, wherein the mounting frame is fixed on a furnace body steel plate outside the channel section, one end of the screw rod is fixed on the mounting frame, the nuts, the sleeve, the spring and the limiting block penetrate through the screw rod, the nuts are screwed between the mounting frame and the sleeve, the nuts tightly push one end of the sleeve, the sleeve is sleeved outside the spring,
one end of the steel structure frame is provided with a roller, the other end of the steel structure frame is provided with a limiting block, one end of the sleeve is sleeved outside the limiting block, the limiting block is tightly propped against the spring in the sleeve, one end of the shaft bracket is fixed on the water-cooling door frame, the other end of the shaft bracket is penetrated with a rotating shaft, one end of the shaft bracket provided with the rotating shaft is inserted into the steel structure frame, the steel structure frame is hinged with the shaft bracket through the rotating shaft, the rotating shaft is positioned at a position of the steel structure frame close to the middle,
when the nut is screwed, the nut drives the sleeve to move towards the steel structure frame, the spring is compressed until the sleeve extrudes the steel structure frame, the steel structure frame rotates around the rotating shaft by an angle, and the roller compresses the door body.
Further, the outer wall of the limiting block is provided with scales.
Further, the sealing unit group comprises a sealing cylinder sleeve, a sealing compression steel sleeve, an airtight steel ring and a sealing compression steel ring, wherein the sealing cylinder sleeve is fixed on the furnace door steel structure, the periphery of one end of the furnace door steel structure of the mechanical arm channel facing the channel section is bent to form a circle of baffle ring, the periphery of one end of the sealing cylinder sleeve facing the channel section is bent to form a circle of extrusion ring, the sealing cylinder sleeve seals the two circles of oil-immersed graphite packing and the airtight steel ring between the extrusion ring and the baffle ring, the airtight steel ring is arranged between the two circles of oil-immersed graphite packing and the furnace door steel structure, the airtight steel ring is communicated with a nitrogen pipeline of an external nitrogen sealing system, a circle of bulge is formed on one side of the airtight steel ring facing the center of a circle, a nitrogen channel is formed in the airtight steel ring and the bulge, and the bulge separates the two circles of oil-immersed graphite packing from a gap so that nitrogen is introduced into the mechanical arm channel;
the periphery of one end, far away from the channel section, of the sealing cylinder sleeve is bent to form a circle of locating ring, the locating ring is fixed on an external furnace door steel structure through a bolt, the sealing compression steel sleeve is fixed on the locating ring of the sealing cylinder sleeve through a bolt, and the sealing compression steel sleeve seals the five circles of oil-immersed graphite packing, the oil sealing steel ring, the sealing compression steel ring and the round rubber tube sealing ring between the extrusion ring and the sealing compression steel sleeve.
Further, the extrusion ring of sealed cylinder liner is tightly pressed on one end of five rings of oily graphite packing, seal compresses tightly the steel bushing and five rings of oily graphite packing, the round rubber tube sealing washer extrudees in the gap between seal compress steel bushing and the seal compress steel bushing, the oily seal steel ring inserts in five rings of oily graphite packing, make the interval of five rings of oily graphite packing go out the gap, high temperature grease passes through the concentrated lubrication pipeline of centralized lubrication system and the oily seal steel ring that links to each other with concentrated lubrication pipeline evenly with high temperature grease smear around the arm of charging tray transfer machine, five rings of oily graphite packing and two rings of oily graphite packing all contact with the arm of charging tray transfer machine, and between five rings of oily graphite packing, two rings of oily graphite packing all and the arm of charging tray transfer machine by high temperature grease lubrication filling.
Further, the number of the mechanical arm channels is three, and the upper side and the lower side of each mechanical arm channel are respectively provided with a supporting wheel assembly; the fixed pulley system is provided with two fixed pulley systems which are arranged above the door body side by side; five compaction adjusting mechanisms are symmetrically arranged on the left side and the right side of the door body respectively.
Compared with the prior art, the sliding seal furnace door for gear carburizing heat treatment has the following advantages: the sealing furnace door is applied to a large annular rotary bottom type gas carburizing furnace. A tray transfer machine is designed on the inner ring side of a large annular rotary bottom type gas carburizing furnace, a mechanical arm hand of the tray transfer machine needs to do actions of transferring a tray to different stations in the furnace, and meanwhile, the carburizing atmosphere in the furnace is isolated from the outside air, so that a novel sealing furnace door matched with the tray transfer machine needs to be designed.
The novel sealing furnace door is a sealing furnace door structure designed for the characteristics of the back-and-forth reciprocating motion and the up-and-down reciprocating motion of the mechanical arm of the inner ring tray transfer machine at the high temperature in the furnace.
The sealing furnace door is matched with the mechanical arm of the tray transfer machine, when the mechanical arm of the inner ring tray transfer machine reciprocates back and forth and reciprocates up and down at high temperature in the furnace, the sealing furnace door is in a sliding state, but can maintain a stable sealing relationship with the water-cooling furnace door frame on the outer wall of the furnace wall and the mechanical arm of the inner ring tray transfer machine, the possibility that air outside the furnace enters the furnace is avoided through the design, the key index IGO of the gear is ensured to reach the national standard, and the technical bottleneck of the application of the large annular rotary bottom type gas carburizing furnace in the gear carburizing heat treatment field is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the use of the present invention;
FIG. 2 is a cross-sectional view taken along the A-A plane of FIG. 1;
FIG. 3 is a front view of the present invention;
FIG. 4 is a cross-sectional view taken along the B-B plane in FIG. 3;
FIG. 5 is a cross-sectional view taken along the plane D-D in FIG. 3;
FIG. 6 is a cross-sectional view taken along the plane C-C of FIG. 4;
FIG. 7 is a schematic perspective view of the present invention;
FIG. 8 is a schematic view of a water-cooled door frame;
FIG. 9 is a vertical internal cross-sectional view of a water-cooled door frame;
FIG. 10 is a cross-sectional view taken along the E-E plane of FIG. 9;
FIG. 11 is a schematic structural view of a furnace door steel structure;
FIG. 12 is a schematic view in the direction G of FIG. 11;
FIG. 13 is a cross-sectional view taken along the H-H plane of FIG. 12;
FIG. 14 is a schematic perspective view of a steel structure of an oven door;
FIG. 15 is a schematic view of the internal structure of the oven door steel structure;
FIGS. 16 and 18 are schematic perspective views of the compression adjustment mechanism;
FIG. 17 is an enlarged schematic view of the scale of portion A of FIG. 16;
FIG. 19 is a schematic view of the internal structure of the compression adjustment mechanism;
FIG. 20 is a schematic view in vertical section of a seal unit group;
FIG. 21 is an enlarged schematic view of portion B of FIG. 20;
FIG. 22 is a schematic cross-sectional view of the horizontal direction of FIG. 20;
reference numerals illustrate:
1-a mechanical arm; 2-sliding seal oven door for gear carburizing heat treatment; 3-channel segments; 4-an annular rotary hearth furnace; 5-gear workpiece and tray; 6-a fork of a mechanical arm; 7-water-cooling a door frame; 8-a furnace door steel structure; 9-supporting wheels; 10-compressing and adjusting mechanism; 11-a sealing unit group; 12-fixed pulley system; 13-centralized lubrication system; 14-nitrogen sealing system; 15-furnace door refractory; 16-counterweight; 17-steel plate; 18-a robotic arm channel; 19-square bar steel; 20-a water inlet; 21-a water outlet; 22-sleeve; 23-screw; 24-oil inlet; 25-centralized lubrication pipeline; 26-an oil groove; 27-a shaft bracket; 28-nut; 29-a spring; 30-limiting blocks; 31-steel structure frame; 32-rotating shaft; 33-a roller; 34-mounting rack; 35-sealing the cylinder sleeve; 36-airtight steel ring; 37-two circles of oil immersed graphite packing; 38-nitrogen line; 39-sealing and compacting the steel sleeve; 40-oil seal steel ring; 41-sealing and compacting a steel ring; 42-five circles of oil immersed graphite packing; 43-a round rubber tube sealing ring; 44-positioning ring; 45-baffle ring; 46-a squeeze ring; 47-bump.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-22, a sliding seal furnace door for gear carburizing heat treatment comprises a door body, a water-cooled door frame 7, supporting wheel assemblies, a pressing adjustment mechanism 10 and a fixed pulley system 12, wherein the water-cooled door frame 7 is fixed at a starting port of a channel section 3 of an annular rotary hearth furnace 4, the door body is connected to the outer end of the water-cooled door frame 7 through a grease lubrication sealing layer, a mechanical arm channel 18 for a mechanical arm 1 to pass through is arranged in the middle of the door body, the supporting wheel assemblies are arranged on the outer side of the door body and are positioned on the upper side and the lower side of the mechanical arm channel 18, and supporting wheels 9 of the supporting wheel assemblies are connected to the upper end and the lower end of the mechanical arm 1 in a rolling mode.
The support wheel 9 is responsible for supporting the mechanical arm 1 of the tray transfer machine. In order to protect the sealing unit group 11 of the oven door from the pressure caused by the rising and falling of the mechanical arm 1, the mechanical arm 1 drives the supporting wheel 9 to rise and fall, and the supporting wheel 9 is fixed on the oven door, so that the oven door is driven to move up and down. Thereby avoiding the pressure on the sealing unit group 11 when the robot arm 1 is raised and lowered. The service life of the sealing unit group 11 is prolonged, and the sealing unit group 11 has better sealing function and better effect. When the mechanical arm 1 of the tray transfer machine advances and retreats, the supporting wheel 9 also rotates along with the mechanical arm, and the rotation of the supporting wheel 9 reduces friction on the surface of the mechanical arm 1 and protects the smooth surface of the mechanical arm 1 from abrasion.
The fixed pulley system 12 is arranged above the channel section 3 of the annular rotary hearth furnace 4, the fixed pulley system 12 comprises a fixed pulley, a rope, a counterweight 16 and a bracket, the fixed pulley is arranged on the bracket, the rope bypasses the fixed pulley, one end of the rope is connected with the counterweight 16, and the other end of the rope is connected with the door body. The mechanical arm 1 of the tray transfer machine ascends and descends to drive the furnace door to move up and down, and because the furnace door is heavy, if the furnace door is driven to move up and down only by the ascending and descending of the mechanical arm 1, the pressure in the vertical direction received by the mechanical arm 1 is too large, and the mechanical arm 1 is easy to bend and deform after long-term running. In order to relieve the pressure of the oven door on the mechanical arm 1, a fixed pulley system 12 is therefore provided for sliding sealing the oven door 2 for gear carburizing heat treatment. The system is designed with a counterweight 16 of the oven door, and the counterweight 16 forms a balance pair with the oven door through a pulley, so that the pressure of the oven door on the mechanical arm is relieved.
The periphery of the mechanical arm channel 18 of the door body is provided with a sealing unit group 11, the compression adjusting mechanism 10 is arranged on two sides of the water-cooling door frame 7, and the frames on two sides of the door body are compressed through the compression adjusting mechanism 10.
Two cavity water jackets are formed in the water-cooling door frame 7 through a front steel plate 17, a rear steel plate 17 and a plurality of square bar steels 19, the square bar steels 19 are welded between the two steel plates 17, each cavity water jacket is provided with a water inlet 20 and a water outlet 21, and the water-cooling door frame 7 and the channel section 3 are sealed through sealing gaskets and fixed through bolts and nuts. The temperature in the annular rotary hearth furnace is about 900 degrees, and even the channel section is about 400-600 degrees. The oven door frame is thus designed in a water-cooled form in order to prevent deformation of the oven door frame. The detailed structure is shown in fig. 8-10. Cooling water enters the two water jackets from the two water inlets 20 below respectively, and is discharged from the two water outlets 21.
A circle of oil grooves 26 are formed in the frame of the door body, high-temperature lubricating grease is beaten into the oil grooves 26 of the door body through an oil inlet 24 and an oil pipeline 25 on the door body by the centralized lubricating system, and the high-temperature lubricating grease is evenly distributed on a plane where the door body is contacted with the water-cooled door frame 7 through the oil grooves 26, so that a grease lubricating sealing layer is formed. The oil grooves 26 on each side of the frame of the door body are of a wavy structure with high and low fluctuation.
The door body comprises a layer of furnace door steel structure 8 wrapped at the periphery and furnace door refractory 15 filled in the interior. A sliding seal furnace gate steel construction 8 for gear carburizing heat treatment exists very narrow gap between furnace gate steel construction 8 and the water-cooling door frame, fills this gap through high temperature grease, forms grease lubrication seal layer, when the sliding seal furnace gate 2 for gear carburizing heat treatment slides from top to bottom in water-cooling door frame 7, owing to have the packing of high temperature grease between, effectually played lubrication effect promptly, played the effect of grease seal again, effectively prevented the reducing gas in the stove to escape to the furnace gate outside. The high-temperature lubricating grease is pumped into an oil groove 26 of the furnace door through an oil inlet 24 and an oil pipeline 25 on the furnace door by the centralized lubricating system. The grease is uniformly distributed on the contact plane of the furnace door and the water-cooled door frame 7 through the oil groove 26, so as to form a grease lubrication sealing layer. Part of the grease enters the surface of the oven door, which contacts the mechanical arm 1 of the tray transfer machine, through the oil pipeline 25, and a grease lubrication sealing layer is also formed. When the mechanical arm 1 of the tray transfer machine advances and retreats, high-temperature grease is filled between the surfaces of the furnace door and the mechanical arm 1 of the tray transfer machine, so that the lubricating effect is effectively achieved, the grease sealing effect is also achieved, and the reducing gas in the furnace is effectively prevented from escaping to the outside of the furnace door.
The compression adjustment mechanism 10 comprises a mounting frame 34, a rotating shaft 32, a shaft bracket 27, a steel structure frame 31, rollers 33, nuts 28, a screw 23, a spring 29, a sleeve 22 and a limiting block 30, wherein the mounting frame 34 is fixed on a furnace body steel plate outside the channel section 3, one end of the screw 23 is fixed on the mounting frame 34, the nuts 28, the sleeve 22, the spring 29 and the limiting block 30 penetrate through the screw 23, the nuts 28 are screwed between the mounting frame 34 and the sleeve 22, one end of the sleeve 22 is tightly propped by the nuts 28, and the sleeve 22 is sleeved outside the spring 29.
The gyro wheel 33 is installed to the one end of steel construction frame 31, the stopper 30 is fixed to the other end of steel construction frame 31, the one end cover of sleeve 22 is outside stopper 30, stopper 30 is tight spring 29 in sleeve 22 top, the one end of pedestal 27 is fixed on water-cooling door frame 7, the other end of pedestal 27 runs through there is pivot 32, the one end that pedestal 27 was equipped with pivot 32 inserts in the steel construction frame 31, steel construction frame 31 articulates in pedestal 27 through pivot 32, pivot 32 is located the position near the centre of steel construction frame 31. The outer wall of the limiting block 30 is provided with scales.
When the nut 28 is screwed by a wrench, the nut 28 drives the sleeve 22 to move towards the steel structure frame 31, compressing the spring 29 until the sleeve 22 presses the steel structure frame 31, so that the steel structure frame 31 rotates around the rotating shaft 32 by an angle, and the roller 33 presses the door body. Otherwise, the door body is loosened. In order to ensure that the force for compressing and adjusting the furnace door is uniform, a plurality of compressing and adjusting mechanisms are uniformly distributed on two sides of the whole furnace door.
A very narrow gap exists between the steel structure of the sliding seal furnace door 2 for gear carburizing heat treatment and the water-cooled door frame 7. The gap is adjusted by the hold-down adjustment mechanisms 10. If the gap is too wide, the amount of grease consumed increases to ensure sealing. Too narrow a gap increases the sliding friction between the oven door and the water-cooled door frame 7. Therefore, the device needs to be adjusted to a proper value according to actual production operation conditions and displayed by scales on the limiting block 30.
The sealing unit group 11 comprises a sealing cylinder sleeve 35, a sealing compression steel sleeve 39, an airtight steel ring 36 and a sealing compression steel ring 41, wherein the sealing cylinder sleeve 35 is fixed on a furnace door steel structure 8, the periphery of one end of the furnace door steel structure 8 of the mechanical arm channel 18, which faces towards the channel section 3, is bent to form a circle of baffle ring 45, the periphery of one end of the sealing cylinder sleeve 35, which faces towards the channel section 3, is bent to form a circle of extrusion ring 46, the sealing cylinder sleeve 35 seals two circles of oil-immersed graphite packing 37 and the airtight steel ring 36 between the extrusion ring 46 and the baffle ring 45, the airtight steel ring 36 is arranged between the two circles of oil-immersed graphite packing 37 and the furnace door steel structure 8, the airtight steel ring 36 is communicated with a nitrogen pipeline 38 of an external nitrogen sealing system 14, a circle of protrusion 47 is formed on one side of the airtight steel ring 36 towards the circle center, a nitrogen channel is formed in the airtight steel ring 36 and the protrusion 47, and the protrusion 47 separates gaps between the two circles of oil-immersed graphite packing 37, so that nitrogen is introduced into the mechanical arm channel 18 and blown onto the mechanical arm 1 of the tray transfer machine, and plays a role of air seal; the two circles of oil immersed graphite packing 37 are in contact with the mechanical arm 1 of the tray transfer machine, and the two circles of oil immersed graphite packing are lubricated and filled by high-temperature lubricating grease. The two turns of oil impregnated graphite packing 37 is the first seal.
The periphery of one end, far away from the channel section 3, of the sealing cylinder sleeve 35 is bent to form a circle of locating ring 44, the locating ring 44 is fixed on an external furnace door steel structure 8 through bolts, the sealing compression steel sleeve 39 is fixed on the locating ring 44 of the sealing cylinder sleeve 35 through bolts, and the sealing compression steel sleeve 39 seals five circles of oil-immersed graphite packing 42, the oil sealing steel ring 40, the sealing compression steel ring 41 and the round rubber tube sealing ring 43 between the extrusion ring 46 and the sealing compression steel sleeve 39.
The extrusion ring 46 of the cylinder cover 35 is tightly sealed on one end top of the five rings of oil immersed graphite packing 42, the sealing compression steel ring 41 is compressed between the sealing compression steel sleeve 39 and the five rings of oil immersed graphite packing 42, the round rubber tube sealing ring 43 is extruded in a gap between the sealing compression steel ring 41 and the sealing compression steel sleeve 39, the oil sealing steel ring 40 is inserted into the five rings of oil immersed graphite packing 42, gaps are formed between the five rings of oil immersed graphite packing 42, high-temperature grease passes through the centralized lubrication pipeline 25 of the centralized lubrication system 13 and the oil sealing steel ring 40 connected with the centralized lubrication pipeline 25 to uniformly smear the high-temperature grease around the mechanical arm 1 of the tray transfer machine, the five rings of oil immersed graphite packing 42 and the two rings of oil immersed graphite packing 37 are in contact with the mechanical arm 1 of the tray transfer machine, and the five rings of oil immersed graphite packing 42, the two rings of oil immersed graphite packing 37 and the mechanical arm 1 of the tray transfer machine are filled by high-temperature lubrication. Five turns of the oil impregnated graphite packing 42 is the second seal.
The sealing and compacting steel ring 41 compacts the round rubber tube sealing ring 43, so that the round rubber tube sealing ring 43 is tightly pressed on the mechanical arm 1 of the tray transfer machine. The round rubber tube seal 43 is the third seal.
The three seals together with the lubrication seal of the high temperature lubrication grease and the seal of the nitrogen form the sealing unit group 11 of the oven door. When the mechanical arm 1 of the tray transfer machine moves forward and backward, the sealing unit group 11 effectively isolates the air outside the furnace from the reducing gas in the furnace, so that a very good sealing effect is achieved.
The centralized lubrication system 13 distributes high-temperature lubricating grease evenly to the positions needing lubrication, namely the lubrication positions of the furnace door and the water-cooling door frame 7 and the lubrication positions between the sealing unit group 11 and the mechanical arm 1 of the tray transfer machine.
The nitrogen sealing system 14 blows nitrogen between the sealing unit group 11 and the mechanical arm of the tray transfer machine through a pipeline and an airtight steel ring, thereby playing a role in not only air sealing, but also reducing the temperature of the mechanical arm 1 and lubricating grease on the mechanical arm.
The sliding seal furnace door 2 for gear carburizing heat treatment is filled with a furnace door refractory 15, and the temperature in the annular rotary hearth furnace is about 900 degrees, and even the channel section is about 400-600 degrees. In order to prevent the oven door from being deformed by heat, a fiber lining is designed on the inner side of the oven door to insulate heat.
The number of the mechanical arm channels 18 is three, and the upper side and the lower side of each mechanical arm channel 18 are respectively provided with a supporting wheel assembly; the fixed pulley system 12 is arranged in two and is arranged above the door body side by side; five compression adjusting mechanisms 10 are symmetrically arranged on the left side and the right side of the door body respectively.
The using process comprises the following steps:
when the gear workpiece and the tray 5 in the annular rotary hearth furnace need to be moved from the in-furnace charging and discharging station to the quenching waiting station, this action needs a tray transfer machine to complete.
The whole discharging action flow is described as follows:
the mechanical arm 1 of the tray transfer machine advances one stroke to move the fork arm 6 of the mechanical arm of the tray transfer machine to the lower surface of the tray, then the fork arm 6 of the mechanical arm of the tray transfer machine supports the tray 5 to a certain height so as to separate from the bottom of the annular rotary hearth furnace, then the mechanical arm 1 of the tray transfer machine advances one stroke again to move the fork arm 6 of the mechanical arm 1 of the tray transfer machine to the quenching waiting station, then the fork arm 6 of the mechanical arm 1 of the tray transfer machine drops the tray to the quenching waiting station, and then the mechanical arm 1 of the tray transfer machine and the fork arm 6 thereof retract to the starting position of the channel section 3.
The whole action is briefly described as follows: the mechanical arm 1 of the tray transfer machine and the fork thereof always advance, ascend, advance, descend and retract. During the process, the sliding seal furnace door 2 for gear carburizing heat treatment moves up and down to and fro along with the action of the mechanical arm 1.
When the gear workpiece and the tray 5 in the annular rotary hearth furnace need to be moved from the quenching waiting station to the in-furnace charging and discharging station, this action needs a tray transfer machine to complete.
The whole feeding action flow is described as follows:
the mechanical arm 1 of the tray transfer machine advances a long distance stroke to move the fork arm 6 of the mechanical arm of the tray transfer machine to the position below the tray 5, then the fork arm 6 of the mechanical arm of the tray transfer machine supports the tray 5 to a certain height so as to separate from a cushion block of a quenching waiting station, then the mechanical arm 1 of the tray transfer machine retreats by a stroke, the fork arm 6 of the mechanical arm of the tray transfer machine supports a gear workpiece and the tray 5 to move to a furnace feeding and discharging station, then the mechanical arm 1 of the tray transfer machine descends to a certain height, the fork arm 6 of the mechanical arm of the tray transfer machine lowers the tray 5 to the furnace bottom of the annular rotary hearth furnace feeding and discharging station, and then the mechanical arm 1 of the tray transfer machine and the fork arm 6 thereof retreats to the starting position of the channel section 3.
The whole action is briefly described as follows: the mechanical arm 1 of the tray transfer machine always moves forward, rises, retreats, falls and retreats again. During the process, the sliding seal furnace door 2 for gear carburizing heat treatment moves up and down to and fro along with the action of the mechanical arm 1.
When the mechanical arm 1 moves forwards, backwards, ascends, descends and the like, the sliding sealing furnace door 2 for gear carburizing heat treatment always keeps sealing with the mechanical arm 1 while sliding up and down, and always keeps sealing with the furnace door water cooling frame.
In the work flow of carburizing heat treatment of gears by large annular rotary hearth type gas carburizing heat treatment furnace equipment, the quenching tank door only has to be opened when feeding and discharging materials. The transfer work of the charging tray with the gears between the charging and discharging station of the annular rotary hearth furnace and the quenching waiting station of the quenching tank is carried out by a mechanical fork arm hand of the inner annular charging tray transfer machine, and the mechanical fork arm hand of the inner annular charging tray transfer machine works in the channel section 3, the annular rotary hearth furnace and the quenching tank all the time, and stays in the channel section for standby when waiting for tasks. And the mechanical arm 1 of the inner ring tray transfer machine is in sealing assembly with the sliding sealing furnace door 2 for gear carburizing heat treatment. Therefore, no external air enters the furnace when the charging and discharging station of the annular rotary hearth furnace and the quenching waiting station of the quenching tank are transferred. The possibility that air outside the furnace enters the furnace is greatly reduced, the key index IGO of the gear is ensured to reach the national standard, and the technical bottleneck of the application of the large annular rotary bottom type gas carburizing furnace in the field of gear heat treatment is solved.
And (3) effect verification:
production conditions:
the heat treatment temperature of the annular rotary hearth furnace is 930 ℃, the material is 18CrNiMo7-6, and the carbon potential of each region in the annular rotary hearth furnace is: 1.15% carburization zone, 0.72% diffusion zone and 0.7% reheat zone.
Test results of the quenched workpiece:
the foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (8)

1. A sliding seal oven door for gear carburizing heat treatment, characterized in that:
the device comprises a door body, a water-cooled door frame (7), supporting wheel assemblies, a compression adjusting mechanism (10) and a fixed pulley system (12), wherein the water-cooled door frame (7) is fixed at a starting port of a channel section (3) of an annular rotary hearth furnace (4), the door body is connected to the outer end of the water-cooled door frame (7) through a grease lubrication sealing layer, a mechanical arm channel (18) used for a mechanical arm (1) to pass through is arranged in the middle of the door body, the supporting wheel assemblies are arranged on the outer side of the door body and are positioned on the upper side and the lower side of the mechanical arm channel (18), and supporting wheels (9) assembled by the supporting wheels are connected to the upper end and the lower end of the mechanical arm (1) in a rolling manner;
the fixed pulley system (12) is arranged above a channel section of the annular rotary hearth furnace (4), the fixed pulley system (12) comprises a fixed pulley, a rope, a counterweight (16) and a bracket, the fixed pulley is arranged on the bracket, the rope bypasses the fixed pulley, one end of the rope is connected with the counterweight (16), the other end of the rope is connected with a door body, sealing unit groups (11) are arranged around a mechanical arm channel (18) of the door body, a compression adjusting mechanism (10) is arranged on two sides of a water-cooled door frame (7), and frames on two sides of the door body are compressed through the compression adjusting mechanism (10); the compression adjustment mechanism (10) comprises a mounting frame (34), a rotating shaft (32), a shaft bracket (27), a steel structure frame (31), rollers (33), nuts (28), a screw (23), springs (29), sleeves (22) and limiting blocks (30), wherein the mounting frame (34) is fixed on a furnace body steel plate outside the channel section (3), one end of each screw (23) is fixed on the mounting frame (34), the nuts (28), the sleeves (22), the springs (29) and the limiting blocks (30) penetrate through the screw (23), the nuts (28) are screwed between the mounting frame (34) and the sleeves (22), one ends of the sleeves (22) are tightly propped by the nuts (28), the sleeves (22) are sleeved outside the springs (29),
one end of a steel structure frame (31) is provided with a roller (33), the other end of the steel structure frame (31) is provided with a limiting block (30), one end of a sleeve (22) is sleeved outside the limiting block (30), the limiting block (30) tightly pushes against a spring (29) in the sleeve (22), one end of a shaft frame (27) is fixed on a water-cooling door frame (7), the other end of the shaft frame (27) is penetrated with a rotating shaft (32), one end of the shaft frame (27) provided with the rotating shaft (32) is inserted into the steel structure frame (31), the steel structure frame (31) is hinged to the shaft frame (27) through the rotating shaft (32), the rotating shaft (32) is positioned at a position, close to the middle, of the steel structure frame (31),
when the nut (28) is screwed, the nut (28) drives the sleeve (22) to move towards the steel structure frame (31), and the spring (29) is compressed until the sleeve (22) presses the steel structure frame (31), so that the steel structure frame (31) rotates around the rotating shaft (32) by one angle, and the roller (33) is further pressed against the door body;
the sealing unit group (11) comprises a sealing cylinder sleeve (35), a sealing compression steel sleeve (39), an airtight steel ring (36) and a sealing compression steel ring (41), wherein the sealing cylinder sleeve (35) is fixed on a furnace door steel structure (8), the periphery of one end, facing the channel section (3), of the furnace door steel structure (8) of the mechanical arm channel (18) is bent to form a circle of baffle ring (45), the periphery, facing the one end of the channel section (3), of the sealing cylinder sleeve (35) is bent to form a circle of extrusion ring (46), the sealing cylinder sleeve (35) seals two circles of oil-immersed graphite packing (37) and the airtight steel ring (36) between the extrusion ring (46) and the baffle ring (45), the airtight steel ring (36) is arranged between the two circles of oil-immersed graphite packing (37) and the furnace door steel structure (8), the airtight steel ring (36) is communicated with a circle of nitrogen pipeline (38) of an external nitrogen sealing system (14), the airtight steel ring (36) forms a circle of protrusions (47) facing one side, nitrogen through channels are formed in the airtight steel ring (36) and the protrusions (47), and the protrusions (47) enable the two circles of oil-immersed graphite packing (37) to be separated from the mechanical arm (18) to go out of the gap;
the periphery of one end, far away from the channel section (3), of the sealing cylinder sleeve (35) is bent to form a circle of positioning ring (44), the positioning ring (44) is fixed on an external furnace door steel structure (8) through bolts, the sealing compression steel sleeve (39) is fixed on the positioning ring (44) of the sealing cylinder sleeve (35) through bolts, and the sealing compression steel sleeve (39) seals the five circles of oil-immersed graphite packing (42), the oil sealing steel ring (40), the sealing compression steel ring (41) and the round rubber tube sealing ring (43) between the extrusion ring (46) and the sealing compression steel sleeve (39).
2. The sliding seal oven door for gear carburizing heat treatment according to claim 1, wherein:
two cavity water jackets are formed in the water-cooling door frame (7) through a plurality of square bars (19), each cavity water jacket is provided with a water inlet (20) and a water outlet (21), and the water-cooling door frame (7) and the channel section (3) are sealed through sealing gaskets and fixed through bolts and nuts.
3. The sliding seal oven door for gear carburizing heat treatment according to claim 1, wherein:
a circle of oil grooves (26) are formed in the frame of the door body, high-temperature lubricating grease is beaten into the oil grooves (26) of the door body through an oil inlet (24) and a concentrated lubricating pipeline (25) on the door body by a concentrated lubricating system, and the high-temperature lubricating grease is evenly distributed on the plane where the door body is contacted with the water-cooled door frame (7) through the oil grooves (26), so that a grease lubricating sealing layer is formed.
4. The sliding seal oven door for gear carburizing heat treatment according to claim 3, wherein:
the oil grooves (26) on each side of the frame of the door body are of a wavy structure with high and low fluctuation.
5. The sliding seal oven door for gear carburizing heat treatment according to claim 1, wherein:
the door body comprises a layer of furnace door steel structure (8) wrapped at the periphery and furnace door refractory materials (15) filled in the furnace door steel structure.
6. The sliding seal oven door for gear carburizing heat treatment according to claim 1, wherein:
the outer wall of the limiting block (30) is provided with scales.
7. The sliding seal oven door for gear carburizing heat treatment according to claim 6, wherein:
the device is characterized in that an extrusion ring (46) of a cylinder sleeve (35) is tightly sealed at one end top of each five-ring oil-immersed graphite packing (42), a sealing compression steel ring (41) is compressed between the sealing compression steel sleeve (39) and the five-ring oil-immersed graphite packing (42), a round rubber tube sealing ring (43) is extruded in a gap between the sealing compression steel ring (41) and the sealing compression steel sleeve (39), the oil sealing steel ring (40) is inserted into the five-ring oil-immersed graphite packing (42), gaps are reserved between the five-ring oil-immersed graphite packing (42), high-temperature grease uniformly smears the high-temperature grease around a mechanical arm (1) of a material disc transfer machine through a centralized lubrication pipeline (25) of a centralized lubrication system (13) and an oil sealing steel ring (40) connected with the centralized lubrication pipeline (25), the five-ring graphite packing (42) and the two-ring graphite packing (37) are in contact with the mechanical arm (1) of the material disc transfer machine, and the five-ring oil-immersed graphite packing (42), the two-ring oil-immersed graphite packing (37) and the material disc transfer machine are filled with high-temperature grease by the mechanical arm (1).
8. The sliding seal oven door for gear carburizing heat treatment according to any one of claims 1 to 7, characterized in that:
the number of the mechanical arm channels (18) is three, and the upper side and the lower side of each mechanical arm channel (18) are respectively provided with a supporting wheel assembly; the fixed pulley systems (12) are arranged in two and are arranged above the door body side by side; five compaction adjusting mechanisms (10) are symmetrically arranged on the left side and the right side of the door body respectively.
CN201911185103.9A 2019-11-27 2019-11-27 Sliding sealing furnace door for gear carburizing heat treatment Active CN110835722B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829554A1 (en) * 1996-09-16 1998-03-18 ALD AICHELIN GesmbH. Low pressure cementation apparatus with compartments disposed one behind the other
CN203007378U (en) * 2012-12-19 2013-06-19 烟台金光工具有限公司 Carburizing and nitriding furnace for continuous production
CN106319436A (en) * 2016-10-26 2017-01-11 东北大学 Vacuum carburization furnace and carburization method adopting vacuum carburization furnace
CN110359009A (en) * 2019-08-08 2019-10-22 江苏良川科技发展有限公司 A kind of multicomponent gas permeation consolidation system and its technique
CN211339666U (en) * 2019-11-27 2020-08-25 特诺恩技术（天津）有限公司 Sliding sealing furnace door

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829554A1 (en) * 1996-09-16 1998-03-18 ALD AICHELIN GesmbH. Low pressure cementation apparatus with compartments disposed one behind the other
CN203007378U (en) * 2012-12-19 2013-06-19 烟台金光工具有限公司 Carburizing and nitriding furnace for continuous production
CN106319436A (en) * 2016-10-26 2017-01-11 东北大学 Vacuum carburization furnace and carburization method adopting vacuum carburization furnace
CN110359009A (en) * 2019-08-08 2019-10-22 江苏良川科技发展有限公司 A kind of multicomponent gas permeation consolidation system and its technique
CN211339666U (en) * 2019-11-27 2020-08-25 特诺恩技术（天津）有限公司 Sliding sealing furnace door

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