Production line with three groups of annular carburizing and intercooling

Abstract

The invention relates to the field of annular carburizing production lines, in particular to a production line with three sets of annular carburizing and intercooling, a front cleaning area is arranged at an outlet of the feeding end of an upper discharging table, a pre-oxidation area is arranged behind the front cleaning area, a preheating furnace is arranged at a discharging port of the pre-oxidation area, and three sets of annular carburizing areas are arranged behind the preheating furnace; the annular carburizing area comprises a strong carburizing area, a diffusion area and an intercooling area, and the strong carburizing area, the diffusion area and the intercooling area are sequentially arranged at a discharging port of the preheating furnace. According to the annular carburizing and intercooling production line, the preheating furnace, the strong carburizing area, the diffusion area and the intercooling area are arranged, so that the production line is provided with three groups of annular carburizing and intercooling structures, flexible production of all workpieces can be realized, and the annular carburizing and intercooling production line capable of realizing strong carburizing, diffusion, intercooling, secondary heating and heat preservation in the process can be realized; the flexibility of the production line and the quality of produced products are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ring carburizing production lines, and particularly to a production line with three groups of ring carburizing and intermediate cooling. Background Art

[0002] The ring carburizing and intermediate cooling production line is an efficient and flexible heat treatment production line, mainly used for carburizing and intermediate cooling of metal workpieces to improve the surface hardness and wear resistance of the workpieces, while maintaining the toughness and strength of the core.

[0003] At present, the ring carburizing and intermediate cooling production lines on the market are divided into one-ring and two-ring types. For the single ring carburizing and intermediate cooling production line, the workpieces need to enter and exit the furnace in sequence, and flexible production cannot be implemented. The double ring carburizing and intermediate cooling production line can achieve flexible production of some workpieces, but only strong carburizing, diffusion, and heat preservation can be achieved in terms of process. Therefore, there is an urgent need for a ring carburizing and intermediate cooling production line that can not only achieve flexible production of all workpieces, but also achieve strong carburizing, diffusion, intermediate cooling, secondary heating, and heat preservation in terms of process. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a production line with three groups of ring carburizing and intermediate cooling is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A production line with three groups of ring carburizing and intermediate cooling includes a loading and unloading table. At the outlet of the loading end of the loading and unloading table, there is a pre-cleaning area. Behind the pre-cleaning area, there is a pre-oxidation area. At the discharge port of the pre-oxidation area, there is a preheating furnace, and behind the preheating furnace, there are three groups of ring carburizing areas; each of the ring carburizing areas includes a strong carburizing area, a diffusion area, and an intermediate cooling area, and the strong carburizing area, the diffusion area, and the intermediate cooling area are sequentially arranged at the discharge port of the preheating furnace; at the discharge port of the intermediate cooling area, there is a heat preservation area. Behind the heat preservation area, there is a quenching area. At the discharge end of the quenching area, there is a post-cleaning area. Behind the post-cleaning area, there is a tempering area. At the discharge end of the tempering area, there is an air-cooling table, and the discharge end of the air-cooling table is connected to the loading and unloading table through a track table.

[0006] In addition, the preferred structure is that a plurality of air-cooling pipes are arranged in the intermediate cooling area, and the air-cooling pipes are all arranged in a "ring" array around the middle of the intermediate cooling area.

[0007] In addition, the preferred structure is that an electric push rod is arranged at the rear end of the pre-oxidation area at the inlet of the preheating furnace, and the top extension end of the electric push rod faces the inlet of the preheating furnace.

[0008] In addition, the preferred structure is that a high-temperature push chain is arranged inside the preheating furnace, and the other end of the high-temperature push chain extends into the strong carburizing area.

[0009] In addition, a preferred structure is that middle doors are provided in the middle parts of the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone, and the middle doors are all vertically movably arranged.

[0010] In addition, a preferred structure is that circulating fans are provided at the tops of the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone, and two are provided in each of the strong carburizing zone, the diffusion zone and the intermediate cooling zone, and one is provided in the preheating furnace.

[0011] In addition, a preferred structure is that the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone are all arranged inside the furnace shell, and furnace linings are laid on the inner walls of the furnace shell.

[0012] In addition, a preferred structure is that multiple radiant tubes are provided in each of the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone, and the radiant tubes are all vertically arranged.

[0013] In addition, a preferred structure is that an electric rear limit is fixedly arranged at the outlet of the intermediate cooling zone, and the electric rear limit is adapted to an electric push rod.

[0014] The beneficial effects of the present invention are as follows: Through the settings of the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone, three groups of annular carburizing and intermediate cooling structures are provided in this production line, so that not only the flexible production of all workpieces can be realized, but also a heat preservation zone, a quenching zone, a post-cleaning zone, a tempering zone and an air-cooling table are provided in this process, so that an annular carburizing and intermediate cooling production line capable of realizing strong carburizing, diffusion, intermediate cooling, secondary heating and heat preservation can be realized in the process, so as to improve the flexibility of this production line and the quality of the products produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a production line with three groups of annular carburizing and intermediate cooling proposed by the present invention; Figure 2 is a schematic structural diagram of the preheating furnace, the strong carburizing zone, the diffusion zone, the intermediate cooling zone and the heat preservation zone of a production line with three groups of annular carburizing and intermediate cooling proposed by the present invention; Figure 3 is a front structural schematic diagram of the preheating furnace, the strong carburizing zone, the diffusion zone and the intermediate cooling zone of a production line with three groups of annular carburizing and intermediate cooling proposed by the present invention.

[0016] In the figure: 1 upper loading and unloading table, 2 front cleaning zone, 3 pre-oxidation zone, 4 preheating furnace, 5 strong carburizing zone, 6 diffusion zone, 7 intermediate cooling zone, 71 air-cooling pipe, 8 heat preservation zone, 9 quenching zone, 10 post-cleaning zone, 11 tempering zone, 12 air-cooling table, 13 roller table, 14 electric push rod, 15 high-temperature push chain, 16 middle door, 17 slewing bearing, 18 circulating fan, 19 radiant tube, 20 furnace shell, 21 furnace lining, 22 electric rear limit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Referring to Figures 1-3 , a production line with three groups of ring carburizing and intermediate cooling includes a loading and unloading platform 1. An inlet cleaning area 2 is provided at the outlet of the loading end of the loading and unloading platform 1. A pre-oxidation area 3 is provided behind the inlet cleaning area 2. A preheating furnace 4 is provided at the outlet of the pre-oxidation area 3. And three groups of ring carburizing areas are provided behind the preheating furnace 4. The ring carburizing areas respectively include a strong carburizing area 5, a diffusion area 6, and an intermediate cooling area 7. And the strong carburizing area 5, the diffusion area 6, and the intermediate cooling area 7 are sequentially arranged at the outlet of the preheating furnace 4. An insulation area 8 is provided at the outlet of the intermediate cooling area 7. A quenching area 9 is provided behind the insulation area 8. A post-cleaning area 10 is provided at the outlet end of the quenching area 9. A tempering area 11 is provided behind the post-cleaning area 10. An air-cooling table 12 is provided at the outlet end of the tempering area 11. And the outlet end of the air-cooling table 12 is connected to the loading and unloading platform 1 through a track table 13.

[0019] Wherein, a plurality of air-cooling pipes 71 are arranged in the intermediate cooling area 7. And the air-cooling pipes 71 are all arranged in a "ring" array around the middle of the intermediate cooling area 7. Through the arrangement of the air-cooling pipes 71, the workpieces in the intermediate cooling area 7 can be cooled, so that the temperature of the workpieces can be reduced.

[0020] Wherein, an electric push rod 14 is provided at the rear end of the pre-oxidation area 3 at the inlet of the preheating furnace 4. And the extending end of the electric push rod 14 faces the inlet of the preheating furnace 4. Through the arrangement of the electric push rod 14, the workpieces can be pushed into the preheating furnace 4, so that the workpieces can be preheated by the preheating furnace 4.

[0021] Wherein, a high-temperature push chain 15 is arranged inside the preheating furnace 4. And the other end of the high-temperature push chain 15 extends into the strong carburizing area 5. The high-temperature push chain 15 is mainly composed of a gear motor, a heat-resistant steel push head, chain links, and a transmission system, etc. Through the high-temperature push chain 15, the workpieces in the preheating furnace 4 can be horizontally transferred to the strong carburizing area 5. The push head is composed of several heat-resistant steel movable chain links to form a long chain and moves along a special C-shaped guide groove. And when the high-temperature push chain 15 is not working, the whole chain is hidden in the low-temperature chain box to ensure the long service life of the chain and small occupied space.

[0022] Wherein, middle doors 16 are arranged in the middle of the preheating furnace 4, the strong carburizing area 5, the diffusion area 6, and the intermediate cooling area 7. And the middle doors 16 are all vertically movably arranged. The middle door 16 is mainly composed of a heat-insulating furnace door, a lifting mechanism, a transmission mechanism, a sealed box body, etc. Through the middle door 16, one physical area and another physical area can be separated as much as possible, so that the atmosphere and heat of the two areas do not interfere with each other.

[0023] Among them, circulating fans 18 are provided at the tops of the preheating furnace 4, the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7. And there are two circulating fans 18 provided in each of the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7, and one circulating fan 18 is provided in the preheating furnace 4. A forced circulation variable-frequency blower made of heat-resistant alloy is installed at the top of the circulating fan 18, and oil cooling is used for cooling the bearing position of the circulating fan. The circulating fan 18 can ensure the uniformity of the furnace atmosphere. It should be noted that the specific structure and working mode of the circulating fan 18 are both existing technologies already disclosed on the market at present, and they do not belong to the main technical problems to be solved in this technical solution. Therefore, no more details will be given in this invention.

[0024] Among them, the preheating furnace 4, the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7 are all arranged inside the furnace shell 20, and furnace linings 21 are laid on the inner walls of the furnace shell 20. The furnace shell 20 is a welded assembly of steel plates and sections. All the steel plates in the inner cavity of the shell are welded in a sealed manner and inspected for kerosene leakage. The furnace lining 21 is composed of anti-carburizing bricks and high-quality heat-insulating materials. Through the furnace lining 21, heat insulation, heat preservation, heat reflection of the preheating furnace 4, the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7 can be realized, and the energy consumption can also be reduced.

[0025] Among them, multiple radiant tubes 19 are provided in each of the preheating furnace 4, the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7, and the radiant tubes 19 are all arranged vertically. The radiant tubes 19 are made of high-quality heat-resistant steel, and nickel-chromium high-resistance electric heating alloy wires are inside the tubes. The workpiece can be heated through the radiant tubes 19.

[0026] Among them, an electric rear limit 22 is fixedly provided at the outlet of the medium cooling zone 7, and the electric rear limit 22 is adapted to the electric push rod 14. The electric rear limit 22 is composed of a heat-resistant steel limit rod, a motor, a transmission device, a travel switch, etc. The electric push rod 14 can be positioned at the feeding position through the electric rear limit 22, preventing the material tray from colliding with the middle door 16 after deviating from the normal position during lateral transfer.

[0027] In this embodiment, a front cleaning area 2 is provided at the outlet of the loading end of the loading and unloading platform 1. A pre-oxidation area 3 is provided behind the front cleaning area 2. A preheating furnace 4 is provided at the discharge outlet of the pre-oxidation area 3. And three groups of annular carburizing areas are provided behind the preheating furnace 4. The annular carburizing areas respectively include a strong carburizing zone 5, a diffusion zone 6, and a medium cooling zone 7, and the strong carburizing zone 5, the diffusion zone 6, and the medium cooling zone 7 are sequentially arranged at the discharge outlet of the preheating furnace 4. A heat preservation area 8 is provided at the discharge outlet of the medium cooling zone 7. A quenching area 9 is provided behind the heat preservation area 8. A rear cleaning area 10 is provided at the discharge end of the quenching area 9. A tempering area 11 is provided behind the rear cleaning area 10. An air-cooling table 12 is provided at the discharge end of the tempering area 11. And the discharge end of the air-cooling table 12 is connected to the loading and unloading platform 1 through a track platform 13.

[0028] The workpiece on the loading table 1 is pushed into the pre-cleaning area 2 by a pusher for cleaning before heat treatment of the workpiece. After the cleaning is completed, it enters the pre-oxidation area 3 to complete the pre-oxidation of the workpiece. After the pre-oxidation is completed, the workpiece enters the preheating furnace 4 to heat the workpiece to the carburizing temperature. After the heating is completed, the workpiece enters the strong carburizing area 5, the diffusion area 6, and the intermediate cooling area 7. After the carburizing is completed, the workpiece enters the holding area 8 to ensure the quenching temperature. Then the workpiece is quenched. After the quenching is completed, it enters the post-cleaning area 10 for degreasing cleaning of the workpiece. After the cleaning is completed, tempering is carried out. After the tempering is completed, the workpiece enters the air-cooling table 12 to cool the workpiece. After the cooling is completed, it is conveyed by the roller table to the loading table 1.

[0029] Furthermore, this annular carburizing production line has separate heating, carburizing, diffusion, and intermediate cooling areas, and different temperatures and carbon potentials can be obtained in independent furnace chambers. It is especially suitable for the press quenching and direct quenching heat treatment processes of parts such as bevel gears and driving gear shafts in the automotive industry.

[0030] In the present invention, through the settings of the preheating furnace 4, the strong carburizing area 5, the diffusion area 6, and the intermediate cooling area 7, there are three groups of annular carburizing and intermediate cooling structures in this production line. In this way, not only can flexible production of all workpieces be realized, but also a holding area 8, a quenching area 9, a post-cleaning area 10, a tempering area 11, and an air-cooling table 12 are provided in this process. In this way, an annular carburizing and intermediate cooling production line capable of strong carburizing, diffusion, intermediate cooling, secondary heating, and holding can be realized in the process to improve the flexibility of this production line and the quality of the products produced.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A production line with three sets of annular carburizing and intercooling, comprising an upper unloading platform (1), characterized in that: A front cleaning zone (2) is arranged at the outlet of the loading end of the upper unloading platform (1), a pre-oxidation zone (3) is arranged behind the front cleaning zone (2), a preheating furnace (4) is arranged at the outlet of the pre-oxidation zone (3), and three groups of annular carburizing zones are arranged behind the preheating furnace (4); The annular carburizing zone comprises a strong carburizing zone (5), a diffusion zone (6) and an intermediate cooling zone (7), and the strong carburizing zone (5), the diffusion zone (6) and the intermediate cooling zone (7) are sequentially arranged at the discharge port of the preheating furnace (4); The discharge port of the intermediate cooling zone (7) is provided with a heat preservation zone (8), a quenching zone (9) is provided behind the heat preservation zone (8), a post-cleaning zone (10) is provided at the discharge end of the quenching zone (9), a tempering zone (11) is provided behind the post-cleaning zone (10), an air cooling table (12) is provided at the discharge end of the tempering zone (11), and the discharge end of the air cooling table (12) is connected to the upper unloading table (1) via a track table (13).

2. The production line with three sets of annular carburizing and intercooling according to claim 1 is characterized in that: A plurality of air cooling pipes (71) are arranged in the intermediate cooling zone (7), and the air cooling pipes (71) are arranged in a "ring" array around the middle of the intermediate cooling zone (7).

3. The production line with three sets of annular carburizing and intercooling according to claim 2 is characterized in that: An electric push rod (14) is provided at the rear end of the pre-oxidation zone (3) at the entrance of the preheating furnace (4), and the top end of the electric push rod (14) faces the entrance of the preheating furnace (4).

4. The production line with three sets of annular carburizing and intercooling according to claim 3 is characterized in that: A high-temperature push chain (15) is arranged inside the preheating furnace (4), and the other end of the high-temperature push chain (15) extends into the strong permeability zone (5).

5. The production line with three sets of annular carburizing and intercooling according to claim 4, characterized in that: The middle parts of the preheating furnace (4), the strong permeation zone (5), the diffusion zone (6) and the intermediate cooling zone (7) are all provided with middle doors (16), and the middle doors (16) are all arranged to be vertically movable.

6. The production line with three sets of annular carburizing and intercooling according to claim 5, characterized in that: The tops of the preheating furnace (4), the strong infiltration zone (5), the diffusion zone (6) and the intermediate cooling zone (7) are all provided with circulating fans (18), and two are provided in the strong infiltration zone (5), the diffusion zone (6) and the intermediate cooling zone (7), and one is provided in the preheating furnace (4).

7. The production line with three sets of annular carburizing and intercooling according to claim 6, characterized in that: The preheating furnace (4), the strong permeation zone (5), the diffusion zone (6) and the intermediate cooling zone (7) are all arranged in a furnace shell (20), and a furnace lining (21) is laid on the inner wall of the furnace shell (20).

8. The production line with three sets of annular carburizing and intercooling according to claim 7, characterized in that: A plurality of radiation tubes (19) are arranged in the preheating furnace (4), the strong permeation zone (5), the diffusion zone (6) and the intermediate cooling zone (7), and the radiation tubes (19) are all arranged vertically.

9. The production line with three sets of annular carburizing and intercooling according to claim 8, characterized in that: An electric rear limiter (22) is fixedly arranged at the outlet of the intermediate cooling zone (7), and the electric rear limiter (22) is adapted to the electric push rod (14).

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