CN109554521B - Roller type heating furnace for continuous heat treatment special for bearing steel balls - Google Patents
Roller type heating furnace for continuous heat treatment special for bearing steel balls Download PDFInfo
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- CN109554521B CN109554521B CN201811475525.5A CN201811475525A CN109554521B CN 109554521 B CN109554521 B CN 109554521B CN 201811475525 A CN201811475525 A CN 201811475525A CN 109554521 B CN109554521 B CN 109554521B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 105
- 239000010959 steel Substances 0.000 title claims abstract description 105
- 238000010438 heat treatment Methods 0.000 title claims abstract description 75
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- 230000007246 mechanism Effects 0.000 claims description 21
- 210000001503 joint Anatomy 0.000 claims description 14
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- 238000011002 quantification Methods 0.000 claims description 3
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- 238000005096 rolling process Methods 0.000 abstract description 5
- 238000010924 continuous production Methods 0.000 abstract description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- C21D1/34—Methods of heating
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
Abstract
The application relates to a roller type heating furnace for special continuous heat treatment of bearing steel balls, which comprises a furnace body with a feeding end part and a discharging end part, a roller rotationally arranged in the furnace body around a shaft axis extending in the horizontal direction, spiral guide members arranged on the inner wall of the roller and spirally distributed along the length direction of the roller, a heating assembly positioned between the outer side of the roller and the inner wall of the furnace body, and a driving assembly for driving the roller to rotate, wherein the feeding end part is positioned at one end part of the furnace body, the steel balls are sent to the feeding end of the spiral guide members through a spiral feeder, and the discharging end part is positioned at the other end part of the furnace body and communicated with the discharging end part of the spiral guide members. On the premise of meeting continuous production, the application adopts a spiral conveying mode, and in the rolling process of the steel balls, the steel balls are conveyed from the feeding end part to the discharging end part, so that the steel balls are heated more uniformly, the quality of heat treatment of the steel balls is improved, in addition, the yield is obviously increased, and the difference of internal tissues of the steel balls is small, and the quality is stable.
Description
Technical Field
The application belongs to the field of bearing steel ball heat treatment equipment, and particularly relates to a roller type heating furnace for continuous heat treatment of a bearing steel ball.
Background
Along with the improvement of the steel ball manufacturing process and the research and development and the update of equipment, the current process flow is as follows: raw material (bar stock), cold heading, light ball, heat treatment, hard grinding, primary grinding, lapping, super lapping, optical appearance, cleaning and rust prevention, finished product inspection and packaging. Wherein, the cold heading is to process the rod-shaped material into a blank by a steel ball cold header; the ball polishing stage is used for unifying the dimensional tolerance after the cold heading stage, grinding off the annulus and two poles of the ball blank, and basically forming a ball shape; the heat treatment process is used for changing the internal organization structure of the ball blank, improving the strength of the steel ball and prolonging the service life of the steel ball; the hard grinding process is mainly used for improving the dimensional accuracy of the steel ball; the grinding process improves the surface precision, and then the processing is completed after the surface is sorted by a surface detection device.
Meanwhile, the heating furnace adopted in the heat treatment process is a roller furnace, and the roller is an octagonal furnace tank, so the roller furnace is also called as an octagonal roller furnace, however, the roller-type resistance furnace is a periodic operation type resistance furnace and is mainly used for heat treatment heating such as gas carburizing, carbon nitrogen and bright quenching of bearing steel balls, rollers and other small standard components, and therefore, the roller-type resistance furnace has the following technical defects:
1) The steel balls cannot be continuously produced and processed due to periodic operation (namely, after one batch of processing is finished and the next batch of processing is carried out), so that the steel ball forming efficiency is reduced, and the yield is low;
2) The heat treatment quality is unstable, and the internal structure of the steel ball has great difference, so the qualification rate is very low, and the manufacturing cost of the steel ball is higher.
Disclosure of Invention
The application aims to solve the technical problem of overcoming the defects of the prior art and providing a brand new roller type heating furnace for continuous heat treatment of bearing steel balls.
In order to solve the technical problems, the application adopts the following technical scheme:
the utility model provides a special continuous heat treatment's of bearing steel ball drum-type heating furnace, it includes the furnace body that has feeding tip and ejection of compact tip, rotate the cylinder that sets up in the furnace body round the axis that extends of horizontal direction, set up at the cylinder inner wall and be the spiral water conservancy diversion spare of spiral distribution along cylinder length direction, be located the heating element between cylinder outside and the furnace body inner wall, be used for driving the drive assembly of cylinder rotation, wherein feeding tip is located the tip of furnace body, and send the steel ball to the feeding tip of spiral water conservancy diversion spare through the screw feeder, ejection of compact tip is located the other tip of furnace body and communicates with the ejection of compact tip of spiral water conservancy diversion spare.
Preferably, two bearing rollers which rotate around the axis of the roller are arranged side by side at one end of the furnace body, the roller is freely erected on the two bearing rollers from one end, and the driving assembly is arranged at the other end of the roller. The advantage of setting up like this, the rotation drive of realization cylinder of very laborsaving reduces the energy consumption, and simultaneously, the dynamics of rolling of steel ball is even relatively, more is favorable to the even heating of steel ball.
According to one specific implementation and preferred aspect of the application, the screw feeder comprises a body capable of being set in the feeding end of the furnace body in a synchronous rotation with the drum and extending inside the drum, a conveying mechanism which is in butt joint with the body and capable of conveying the steel balls to the body in batches and in doses.
Preferably, the device body comprises a first feeding cylinder and a second feeding cylinder, wherein the first feeding cylinder is communicated with the discharging end part of the conveying mechanism, a spiral feeding channel which can be communicated with the spiral guide piece is arranged inside the first feeding cylinder, and when the first feeding cylinder rotates to the position where the spiral feeding channel is communicated with the spiral guide piece, the steel ball falls into the spiral guide piece in the roller from the spiral feeding channel. Here, through the setting of spiral feed channel, reduce the leakage of interior steam of cylinder and protective atmosphere, practice thrift the energy consumption, reduce steel ball heat treatment cost.
Specifically, a gap is formed in the spiral feeding channel, and when the first feeding cylinder rotates until the gap faces downwards, the steel ball automatically falls into the spiral guide piece in the roller.
Preferably, the first feeding cylinder is in a frustum shape with the inner diameter gradually becoming larger from the feeding end of the furnace body to the second feeding cylinder, the second feeding cylinder horizontally extends from the feeding end of the first feeding cylinder far away from the furnace body to the inside of the roller, and the inside of the second feeding cylinder is filled with a heat preservation and insulation layer.
Preferably, the conveying mechanism comprises a storage bin with a first channel door, a middle bin which is in butt joint with the discharging end of the storage bin and is provided with a second channel door, and a conveying channel for butt joint between the middle bin and the feeding end of the furnace body, wherein the storage bin is positioned above the middle bin, and the second channel door is closed when the first channel door is opened; the first access door is closed when the second access door is open.
While this feeding of batches of steel balls with intermediate bins is a common practice in the art, it has a very unexpected technical effect in the present application that is: and the spiral feeding channel is further combined, so that the leakage of hot gas and protective atmosphere is thoroughly eliminated, the energy consumption is saved, and the heat treatment cost of the steel ball is greatly reduced. The technical effect carried is therefore quite remarkable.
Specifically, the second channel door is arranged at the discharge port of the midway bin in a turnover manner around the horizontal direction from one side part, and the discharge end part of the conveying channel extends into the body.
According to still another specific implementation and preferred aspect of the present application, the heating furnace further includes a loading unit for quantitatively supplying the steel balls to the storage bin, the loading unit includes a steel ball storage bin, a hopper butted with a discharge port of the steel ball storage bin, an oscillator provided on the hopper for controlling discharge of the steel balls, a weighing mechanism rotatably provided under the hopper around a pivot extending in a horizontal direction and having a collecting tank butted with the discharge port of the hopper, and a hoist butted with the collecting tank and capable of lifting the steel balls to the storage bin, wherein the weighing mechanism includes a bracket rotated around the pivot, a balancing weight and the collecting tank at both ends of the bracket, and a balancing sensor, the oscillator stops oscillating when the balancing sensor receives feedback of balancing information at both sides of the pivot, the steel balls in the hopper stop falling, a bin door of the collecting tank is opened, and the hoist lifts the steel balls after quantification to the storage bin.
In addition, the heating assembly includes a first heating unit extending downward from the top of the furnace and positioned between the side of the drum and the side wall of the furnace, and a second heating unit extending horizontally from the side of the furnace and positioned between the bottom of the drum and the inner wall of the bottom of the furnace.
Specifically, the first heating unit and the second heating unit respectively comprise a plurality of heating rods, and the plurality of heating rods are distributed at intervals along the length direction of the roller, so that the steel balls are heated more uniformly.
Meanwhile, the heating furnace further comprises a safety valve assembly arranged at the feeding end part of the furnace body, an atmosphere protection assembly arranged at the discharging end part of the furnace body, a discharging channel communicated with the discharging end part of the furnace body and an oil curtain arranged in the discharging channel.
As for the safety valve assembly, in the art, once explosion occurs, the pressure generated by the explosion can be rapidly leaked out, so that the safety of equipment is ensured.
As for the atmosphere protection component, the formed protective atmosphere is nitrogen and propane pyrolysis gas, so that a certain carbon potential in the roller is ensured, and the bearing steel ball is not decarburized.
As for the oil curtain, on one hand, the steel ball can not generate leakage of hot gas and protective gas in the process of feeding and discharging by matching the two channel doors with the spiral feeding channel, so that the heat treatment cost is reduced; on the other hand, oil vapor generated during quenching of the steel ball is prevented from entering the furnace body, so that carbon deposition or corrosion of a hearth can be avoided, and meanwhile, the quality of the steel ball is ensured.
Due to the implementation of the technical scheme, compared with the prior art, the application has the following advantages:
on the premise of meeting continuous production, the application adopts a spiral conveying mode, and in the rolling process of the steel balls, the steel balls are conveyed from the feeding end part to the discharging end part, so that the steel balls are heated more uniformly, the quality of heat treatment of the steel balls is improved, in addition, the yield is obviously increased, and the difference of internal tissues of the steel balls is small, and the quality is stable.
Drawings
The application will now be described in further detail with reference to the accompanying drawings and specific examples:
FIG. 1 is a schematic front view (partially cut-away) of a drum-type heating furnace of the present application;
FIG. 2 is a left side schematic view of FIG. 1;
FIG. 3 is a right side schematic view of FIG. 1;
FIG. 4 is a schematic view of a part of the steel ball feeding unit in FIG. 1;
wherein: 1. a furnace body; 10. a feed end; 11. a discharge end; 2. a roller; 3. a spiral flow guide; 4. a heating assembly; 41. a first heating unit; 42. a second heating unit; 5. a drive assembly; 6. a safety valve assembly; 7. an atmosphere protection assembly; 8. a blanking channel; 9. an oil curtain; a. carrying rollers; b. a screw feeder; b1, a device body; b11, a first feeding cylinder; b12, a second feeding cylinder; b13, a heat preservation material layer; b2, a conveying mechanism; b20, a storage bin; b201, a first access door; b21, a midway bin; b212, a second channel door; b22, a conveying channel; c. a spiral feed channel; d. a heating rod; e. a feeding unit; e1, a steel ball storage bin; e2, a hopper; e3, an oscillator; e4, a weighing mechanism; e40, pivot; e41, collecting tank; e42, a bracket; e43, balancing weight; e5, lifting machine; e6, an air cylinder; and e7, sealing the door.
Description of the embodiments
The present application will be described in detail with reference to the drawings and the detailed description, so that the above objects, features and advantages of the present application can be more clearly understood. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
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" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As shown in fig. 1 to 3, in this example, a drum-type heating furnace for continuous heat treatment of bearing steel balls comprises a furnace body 1 having a feed end 10 and a discharge end 11, a drum 2 rotatably disposed in the furnace body 1 about a horizontal axis extending in the horizontal direction, spiral guides 3 disposed on the inner wall of the drum 2 and spirally distributed along the length direction of the drum 2, a heating assembly 4 disposed between the outer side of the drum 2 and the inner wall of the furnace body 1, a driving assembly 5 for driving the drum 2 to rotate, a safety valve assembly 6 disposed at the feed end 10 of the furnace body 1, an atmosphere protection assembly 7 disposed at the discharge end 11 of the furnace body 1, a discharge passage 8 communicating with the discharge end 11 of the furnace body 1, and an oil curtain 9 disposed in the discharge passage 8.
As shown in fig. 2, two bearing rollers a rotating around the axis of the bearing rollers a are arranged side by side at the left end of the furnace body 1, and the axis of the bearing rollers a is parallel to the axis of the roller 2.
The roller 2 is freely arranged on two bearing rollers a from the left end, and a driving assembly 5 is arranged at the right end of the roller 2. The advantage of setting up like this, the rotation drive of realization cylinder of very laborsaving reduces the energy consumption, and simultaneously, the dynamics of rolling of steel ball is even relatively, more is favorable to the even heating of steel ball.
As for the structure of the driving assembly 5, referring to fig. 3, the driving assembly 5 is a conventional sprocket transmission mechanism, which is common knowledge in the art and will not be described in detail herein.
In this example, the feeding end 10 is located at the left end of the furnace body 1, and the steel ball is sent to the feeding end of the spiral guide member 3 by the spiral feeder b, and the discharging end 11 is located at the right end of the furnace body 1 and is communicated with the discharging end of the spiral guide member 3.
Meanwhile, the screw feeder b referred to above has a main purpose of: 1. the steel balls are conveniently fed in batches, so that continuous heat treatment is realized in the furnace; 2. and the leakage of hot gas and protective atmosphere in the furnace is prevented when the steel balls are fed.
Specifically, the screw feeder b includes a container body b1 positioned at the feeding end 10 of the furnace body 1 and extending into the drum 2, and a conveying mechanism b2 that is butted with the container body b1 and is capable of conveying steel balls to the container body b1 in batches and quantitatively.
In this example, the device body b1 includes a first feeding barrel b11 and a second feeding barrel b12 that are communicated, wherein the first feeding barrel b11 is communicated with a discharging end of the conveying mechanism b2, and a spiral feeding channel c that can be communicated with the spiral guide member 3 is arranged inside the first feeding barrel b11, and when the first feeding barrel b11 rotates to a position where the spiral feeding channel c is communicated with the spiral guide member 3, the steel ball falls into the spiral guide member 3 in the roller 2 from the spiral feeding channel c.
Specifically, a gap is formed in the spiral feeding channel c, and when the first feeding cylinder b11 rotates until the gap faces downwards, the steel balls automatically fall into the spiral guide piece 3 in the roller 2.
The first feeding cylinder b11 is in a frustum shape with the inner diameter gradually becoming larger from the feeding end 10 of the furnace body 1 to the second feeding cylinder b12, the second feeding cylinder b12 horizontally extends from the end of the first feeding cylinder b11, which is far away from the feeding end of the furnace body 1, to the inside of the roller 2, and the inside of the second feeding cylinder b12 is filled with a heat preservation and insulation layer b13.
In this example, the center lines of the first feed cylinder b11, the second feed cylinder b12, and the drum 2 are arranged in line.
Then, in order to prevent the gas at the feeding end of the drum 2 from leaking into the furnace body 1, in this example, the feeding device further includes a connecting member provided at the outer circumference of the first feeding cylinder b11 and sealing-connecting the feeding end of the drum 2, wherein the connecting member is rotatably provided at the feeding end of the furnace body. The arrangement of the connecting piece is mainly to fix the feeding barrel and the spiral roller into a whole, so that the feeding barrel and the spiral roller rotate together, and when the first feeding barrel rotates to the position that the notch faces downwards, the steel balls fall into the spiral roller.
The conveying mechanism b2 comprises a storage bin b20 with a first channel door b201, a midway bin b21 which is in butt joint with the discharging end of the storage bin b20 and is provided with a second channel door b212, and a conveying channel b22 for butt joint of the midway bin b21 and the feeding end 10 of the furnace body 1, wherein the storage bin b20 is positioned above the midway bin b21, and the second channel door b212 is closed when the first channel door b201 is opened; when the second access door b212 is opened, the first access door b201 is closed.
Although this feeding of batches of steel balls with intermediate bin b21 is a common means in the art, it has a very unexpected technical effect in the present application, namely: and the spiral feeding channel c is further combined, so that the leakage of hot gas and protective atmosphere is thoroughly eliminated, the energy consumption is saved, and the heat treatment cost of the steel ball is greatly reduced. The technical effect carried is therefore quite remarkable.
Specifically, the second channel door b212 is disposed at the discharge port of the intermediate bin b21 from one side portion in a manner turned around the horizontal direction, and the discharge end portion of the conveying channel b22 extends into the inside of the first feed cylinder b 11.
In this example, the heating furnace further comprises a feeding unit e for quantitatively feeding steel balls to the storage bin b20, wherein the feeding unit e comprises a steel ball storage bin e1, a hopper e2 in butt joint with a discharge hole of the steel ball storage bin e1, an oscillator e3 arranged on the hopper e2 and used for controlling steel ball discharge, a weighing mechanism e4 which is arranged below the hopper e2 in a rotating manner around a pivot e40 extending in the horizontal direction and is provided with a collecting groove e41 in butt joint with a discharge hole of the hopper e2, and a lifter e5 which is in butt joint with the collecting groove e30 and can lift the steel balls to the storage bin.
Specifically, the weighing mechanism e4 comprises a bracket e42 rotating around a pivot e40, a balancing weight e43 and a collecting tank e41 positioned at two ends of the bracket, and a balance sensor (not shown in the figure), when the balance sensor receives feedback of balance information positioned at two sides of the pivot, the oscillator e3 stops oscillating, a steel ball positioned in the hopper e2 stops falling, a bin door of the collecting tank e41 is opened, and the elevator e5 lifts the steel ball after quantification to the storage bin b20.
As for the hoist e5, a conventional arrangement is not described in detail here.
For this weighing block, the weighing process of the steel ball is as follows, with reference to fig. 4:
1. the steel ball descends from the steel ball storage bin e1 to a hopper e2 provided with an oscillator e 3;
2. the steel balls are oscillated from the hopper e2 to the collecting tank e41 of the weighing mechanism e4 by the oscillator e 3.
3. When the weight of the steel ball reaches a set value, the weighing mechanism e4 balances, the proximity switch is triggered, and the balance sensor receives balance information and signals the PLC controller.
4. The PLC controller gives a shutdown instruction to the oscillator e3, then the sealing door e7 of the discharge port of the collecting tank e41 is opened through the air cylinder e6, the steel ball is conveyed into the ascending hopper of the hoister e5, after the steel ball collecting tank e41 is completely unloaded, the air cylinder e6 closes the sealing door e7 of the collecting tank e41, and then one-time quantitative feeding of the steel ball is completed.
Meanwhile, as can be seen from fig. 4, the cylinder e6, the closing door e7 and the collecting tank e41 are located on the right side of the pivot e40, the balancing weight e43 is located on the left side of the pivot e40, the collecting tank e41 is inclined from top to bottom, and the closing door e7 is rotatably arranged at the discharging end of the collecting tank e41 from the connecting shaft at the bottom.
Then, in this example, the heating assembly 4 includes a first heating unit 41 extending downward from the top of the furnace body 1 and positioned between the side of the drum 2 and the side wall of the furnace body 1, and a second heating unit 42 extending horizontally from the side of the furnace body 1 and positioned between the bottom of the drum 2 and the bottom inner wall of the furnace body 1.
Specifically, the first heating unit 41 and the second heating unit 42 include a plurality of heating rods d, respectively, and the plurality of heating rods d are distributed at intervals along the length direction of the drum 2, so that the heating of the steel balls is more uniform.
As for the safety valve assembly 6, in the art, once explosion occurs, the pressure generated by the explosion can be rapidly leaked out to ensure the safety of the equipment.
As for the atmosphere protection component 7, the protection atmosphere formed by the atmosphere protection component is nitrogen and propane pyrolysis gas, so that a certain carbon potential in the roller 2 is ensured, and the bearing steel ball is not decarburized.
As for the oil curtain 9, on one hand, the steel ball can not generate leakage of hot gas and protective gas in the process of feeding and discharging by matching the two channel doors with the spiral feeding channel, so that the heat treatment cost is reduced; on the other hand, oil vapor generated during quenching of the steel ball is prevented from entering the furnace body, so that carbon deposition or corrosion of a hearth can be avoided, and meanwhile, the quality of the steel ball is ensured.
In summary, the present embodiment has the following advantages:
1. according to the embodiment, the steel balls can be transferred in the heating furnace in the rolling process of the steel balls, so that the steel balls are heated more uniformly, and the heat treatment quality of the steel balls is improved;
2. through the arrangement of the two channel doors, the spiral feeding channel and the oil curtain, the steel ball can not generate leakage of hot gas and protective gas in the feeding and discharging process, and the heat treatment cost is reduced;
3. under the arrangement of the safety valve assembly, once explosion occurs, the pressure generated by the explosion can be quickly leaked out, so that the safety of equipment is ensured;
4. under the protection of protective atmosphere, a certain carbon potential in the roller is ensured to ensure that the bearing steel ball is not decarburized;
5. on the premise of quantitatively and batchwise realizing steel ball feeding, the steel ball heat treatment process can be realized to be continuous, and is not periodic disclosed by the existing octagonal roller furnace, so that the productivity is remarkably improved, and the quality is relatively stable.
The present application has been described in detail with the purpose of enabling those skilled in the art to understand the contents of the present application and to implement the same, but not to limit the scope of the present application, and all equivalent changes or modifications made according to the spirit of the present application should be included in the scope of the present application.
Claims (3)
1. A special continuous heat treatment's of bearing steel ball drum-type heating furnace which characterized in that: the heating furnace comprises a furnace body with a feeding end part and a discharging end part, a roller rotationally arranged in the furnace body around an axis extending in the horizontal direction, spiral guide pieces arranged on the inner wall of the roller and spirally distributed along the length direction of the roller, a heating assembly positioned between the outer side of the roller and the inner wall of the furnace body, and a driving assembly for driving the roller to rotate, wherein the feeding end part is positioned at one end part of the furnace body, steel balls are sent to the feeding end of the spiral guide pieces through a spiral feeder, and the discharging end part is positioned at the other end part of the furnace body and communicated with the discharging end part of the spiral guide pieces;
two bearing rollers which rotate around the axis of the furnace body are arranged at one end of the furnace body side by side, the roller freely erects the two bearing rollers from one end, the driving component is arranged at the other end of the roller,
the screw feeder comprises a feeder body which can be synchronously and rotatably arranged at the feeding end part of the furnace body along with the roller and stretches into the roller, and a conveying mechanism which is in butt joint with the feeder body and can convey steel balls to the feeder body in batches and quantitatively, wherein the feeder body comprises a first feeding cylinder and a second feeding cylinder, the first feeding cylinder is communicated with the discharging end part of the conveying mechanism, a spiral feeding channel which can be communicated with the spiral guide piece is arranged in the first feeding cylinder, and when the first feeding cylinder rotates to the communication position of the spiral feeding channel and the spiral guide piece, the steel balls fall into the spiral guide piece in the roller from the spiral feeding channel;
a gap is formed in the spiral feeding channel, and when the first feeding cylinder rotates to the position that the gap faces downwards, the steel ball automatically falls into a spiral guide piece in the roller; the first feeding cylinder is in a frustum shape with the inner diameter gradually becoming larger from the feeding end of the furnace body to the second feeding cylinder, the second feeding cylinder horizontally extends from the feeding end of the first feeding cylinder far away from the furnace body to the inside of the roller, and the inside of the second feeding cylinder is filled with a heat preservation and insulation layer;
the conveying mechanism comprises a storage bin with a first channel door, a middle bin which is in butt joint with the discharging end part of the storage bin and is provided with a second channel door, and a conveying channel which is used for butt joint between the middle bin and the feeding end part of the furnace body, wherein the storage bin is positioned above the middle bin, and when the first channel door is opened, the second channel door is closed; when the second access door is opened, the first access door is closed;
the heating furnace also comprises a feeding unit for quantitatively providing steel balls to the storage bin, the feeding unit comprises a steel ball storage bin, a hopper, a vibrator, a weighing mechanism and a lifting machine, the hopper is in butt joint with the discharge hole of the steel ball storage bin, the vibrator is arranged on the hopper and used for controlling steel ball discharge, the weighing mechanism is arranged below the hopper in a pivot extending around the horizontal direction and is in butt joint with the discharge hole of the hopper, the lifting machine is in butt joint with the collecting groove and can lift the steel balls to the storage bin, the weighing mechanism comprises a bracket rotating around the pivot, balancing weights positioned at two ends of the bracket, the collecting groove and a balance inductor, the vibrator stops vibrating when the balance inductor receives balance information feedback positioned at two sides of the pivot, the steel balls in the hopper stop falling, a bin door of the collecting groove is opened, and the lifting machine lifts the steel balls after quantification to the storage bin.
2. The continuous heat treatment drum-type heating furnace special for bearing steel balls according to claim 1, wherein: the heating assembly comprises a first heating unit which extends downwards from the top of the furnace body and is positioned between the side part of the roller and the side wall of the furnace body, and a second heating unit which extends horizontally from the side part of the furnace body and is positioned between the bottom of the roller and the inner wall of the bottom of the furnace body.
3. The continuous heat treatment drum-type heating furnace special for bearing steel balls according to claim 1, wherein: the heating furnace also comprises a safety valve component arranged at the feeding end part of the furnace body, an atmosphere protection component arranged at the discharging end part of the furnace body, a discharging channel communicated with the discharging end part of the furnace body and an oil curtain arranged in the discharging channel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811475525.5A CN109554521B (en) | 2018-12-04 | 2018-12-04 | Roller type heating furnace for continuous heat treatment special for bearing steel balls |
| PCT/CN2019/115355 WO2020114169A1 (en) | 2018-12-04 | 2019-11-04 | Continuous-heat-treatment rotary-drum-type heating furnace special for bearing steel balls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811475525.5A CN109554521B (en) | 2018-12-04 | 2018-12-04 | Roller type heating furnace for continuous heat treatment special for bearing steel balls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109554521A CN109554521A (en) | 2019-04-02 |
| CN109554521B true CN109554521B (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811475525.5A Active CN109554521B (en) | 2018-12-04 | 2018-12-04 | Roller type heating furnace for continuous heat treatment special for bearing steel balls |
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| Country | Link |
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| CN (1) | CN109554521B (en) |
| WO (1) | WO2020114169A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109554521B (en) * | 2018-12-04 | 2023-12-12 | 苏州中门子工业炉科技有限公司 | Roller type heating furnace for continuous heat treatment special for bearing steel balls |
| CN111910067A (en) * | 2020-08-31 | 2020-11-10 | 浙江宏源车轮有限公司 | Rim heat treatment equipment |
| CN113234897B (en) * | 2021-04-16 | 2023-12-22 | 石美 | Heat treatment device with overheat protection function for machining center |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109554521A (en) | 2019-04-02 |
| WO2020114169A1 (en) | 2020-06-11 |
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