Bright heat treatment furnace and treatment process

Abstract

The invention discloses a bright heat treatment furnace and a treatment process. The heat treatment furnace comprises a conveying supporting frame, a furnace body, a feeding conveying device, a discharging conveying device and a heat treatment section located between the feeding conveying device and the discharging conveying device, a breather valve is arranged on the heat treatment section, so that the atmosphere in the furnace is communicated with the outside, oxygen is consumed in the circulation process, inert gas does not need to be filled all the time, and bright annealing in the true sense is achieved; the metal surface is free of an oxide layer and a decarburized layer, online continuous production can be achieved, the production efficiency is greatly improved, and the energy cost is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the field of heat treatment technology, and more specifically to a bright heat treatment furnace and a treatment process. Background Art

[0002] With the continuous advancement of metallurgical technology, alloy steel is increasingly used. Taking the inner ring processing of bearings as an example, its production process is complex, including 23 processes such as steel billet storage and pickling. During the heating and heat treatment process, due to the presence of oxygen in the furnace atmosphere, oxidation reactions occur on the surface of the bearing steel, resulting in black skin and decarburization. It is necessary to add pickling, soft grinding of the end face, soft grinding of the outer diameter, grinding of the end face, grinding of the outer diameter and other processes to remove the oxide layer and decarburization layer during the heating process, which not only wastes a lot of energy, manpower and material resources, increases production costs, but also pollutes the environment.

[0003] The existing oxygen-free heating methods are mainly the following:

[0004] Electric heating inert gas protection heating method: Generally, it is a one-furnace-by-one production with low efficiency, and it is difficult to achieve online continuous production. Since inert gases such as nitrogen or argon are continuously filled into the furnace, the production cost is high, and non-special purpose steel is rarely used. For example, patent CN202509108U discloses a push rod type bright annealing furnace. Although it adopts a bright annealing process, it has a complex structure, inconvenient loading and unloading, low production efficiency, and poor sealing of the vacuum lock chamber. It is difficult to guarantee product quality and cannot meet the needs of mass production.

[0005] Combustion radiation method: The fuel is burned in the ceramic tube, and the ceramic tube radiates heat into the furnace at high temperature, which reduces the energy consumption cost, but the furnace must also be filled with inert gas, the cost is relatively high, and continuous production is rare. There are also cases of continuous production, but the effect is not good. Although the black skin phenomenon is avoided on the metal surface, there is always a layer of oxide film on the surface, and the inner layer of metal close to the film is also decarburized due to oxidation, which reduces the comprehensive performance of the metal surface.

[0006] Oxygen-deficient combustion method: refers to the situation that when the fuel burns in the furnace, the amount of oxygen fed is less than the 1:1 ratio of the combustion ratio, achieving incomplete combustion, but the atmosphere in the furnace still contains a small amount of oxygen, and there is an oxide film and decarburization on the metal surface. For example, patent CN214270973U discloses a small rapid annealing furnace. Although the internal space of the furnace body is divided into a preheating zone, an annealing zone and a heat preservation zone by setting a partition door, semi-continuous automation is achieved, but its structure is complex, and when working continuously, the flame nozzle in the annealing zone does not need to be stopped, but the heat in the annealing zone will still dissipate to the preheating zone and the heat preservation zone, causing a certain amount of heat waste. The cost of the final product is not low.

[0007] Therefore, the art needs a bright heat treatment furnace with a simple structure, easy operation, and the ability to achieve continuous bright heating, improve production efficiency, and reduce production costs. Summary of the invention

[0008] The purpose of the present invention is to provide a bright heat treatment furnace and a treatment process to solve the problems existing in the prior art.

[0009] Not limited to the above theory, the inventors adopt the following technical solution based on the practice and experience of heat treatment technology.

[0010] A bright heat treatment furnace comprises a conveying support frame, a furnace body arranged on the top of the conveying support frame, a first side of the furnace body is provided with a feeding conveying device, a second side of the furnace body is provided with a discharging conveying device, a heat treatment section is located between the two, a first feeding door and a second feeding door are vertically arranged on one side of the heat treatment section close to the feeding conveying device, a first discharging door and a second discharging door are vertically arranged on one side of the heat treatment section close to the discharging conveying device, a first feeding door and a second discharging door are vertically arranged, a feeding pre-storage section is combined between the first feeding door and the second feeding door, a discharging pre-storage section is combined between the first discharging door and the second discharging door, wherein pre-storage section oxygen consumption bags are hung in the inner cavities of the feeding pre-storage section and the discharging pre-storage section, breathing valves are vertically installed on the tops of the heat treatment section, the feeding pre-storage section and the discharging pre-storage section, and furnace door retracting and releasing mechanisms are installed on the tops of the first feeding door, the second feeding door, the first discharging door and the second discharging door.

[0011] Optionally, the feed conveying equipment includes a horizontally arranged conveying platform, and the left end of the conveying platform is fixed with a limit seat by bolts, and a conveying cylinder is horizontally arranged on the side of the limit seat close to the feed door, and a hinge is installed between the conveying cylinder and the limit seat.

[0012] Optionally, the discharging conveying device includes two groups of conveying rollers, and the two groups of conveying rollers are symmetrically arranged, a conveyor belt is sleeved between the outer walls of the two groups of conveying rollers, and a conveying motor is installed at one end of the shaft of the conveying roller.

[0013] Optionally, the breathing valve includes a valve cover, a reversing valve is installed on the top of the inner cavity of the valve cover, a left breathing cylinder and a right breathing cylinder are vertically arranged at the bottom of the reversing valve, and two groups of exhaust gas concentration detectors are arranged above the valve cover, one group of exhaust gas concentration detectors is connected to the left breathing cylinder, and the other group of exhaust gas concentration detectors is connected to the right breathing cylinder.

[0014] Optionally, the left breathing cylinder and the right breathing cylinder have the same structure, and the left breathing cylinder and the right breathing cylinder are symmetrically arranged in the inner cavity of the valve cover with respect to the reversing valve.

[0015] Optionally, the left breathing cylinder includes a cylinder body and an exhaust gas detection cylinder, the cylinder body and the side wall of the exhaust gas detection cylinder are fixedly connected, the side wall of the cylinder body is provided with a breathing hole, the breathing hole is connected to the inner cavity of the exhaust gas detection cylinder, and the inner cavity of the cylinder body and the inner cavity of the pre-storage stage oxygen consumption bag are both provided with resistance wire and carbon powder.

[0016] Optionally, the furnace door retracting and extending mechanism includes a door rail, a cylinder bracket is fixed to the top of the door rail by bolts, a telescopic cylinder is vertically installed in the inner cavity of the cylinder bracket, a movable door panel is installed at the bottom telescopic end of the telescopic cylinder, and the movable door panel is arranged in the inner cavity of the door rail.

[0017] A treatment process of a bright heat treatment furnace comprises the following steps:

[0018] When the bright heating furnace is heat treated and no material is needed for loading and unloading, the first feeding door, the second feeding door, the first discharging door and the second discharging door are in a closed and sealed state. The raw materials to be heat treated are transported to the outside of the first feeding door by the feeding conveying equipment. Under the lifting action of the furnace door retracting mechanism, the first feeding door is opened, and the raw materials to be heat treated enter the feed pre-storage section. The furnace door retracting mechanism is lowered, and the first feeding door is closed. The resistance wire in the oxygen-consuming bag in the pre-storage section of the feed pre-storage section is energized, and the carbon powder in the oxygen-consuming bag in the pre-storage section of the feed pre-storage section reacts with the oxygen in the feed pre-storage section to generate CO2;

[0019] The oxygen concentration in the feed pre-storage section is measured by the exhaust gas concentration detector. When the process requirements are met, the resistance wire in the oxygen consumption bag in the feed pre-storage section is closed. When the heat treatment section needs to be fed according to the production situation, the second feed door is opened. The raw materials to be heat-treated in the feed pre-storage section enter the heat treatment section through the conveying support frame, and the second feed door is closed;

[0020] After the heat treatment of the heat-treated raw materials is completed, open the first discharge door, the heat-treated raw materials pass through the conveying support frame into the discharge pre-storage section, close the first discharge door, open the second discharge door, and when the heat-treated raw materials need to be discharged from the furnace, they are sent to the outside of the second discharge door through the discharge conveying equipment, close the second discharge door, and energize the oxygen consumption bag in the pre-storage section of the discharge pre-storage section, and carry out the oxygen consumption process until the power is turned off after passing the test, waiting for the next heat-treated raw materials to pass through the conveying support frame into the discharge pre-storage section.

[0021] Optionally, the following steps are also included:

[0022] When the breathing valve is working, the reversing valve is in a position connected with the right breathing cylinder and closed with the left breathing cylinder, the resistance wire in the right breathing cylinder is energized and heated, when the furnace pressure increases, the gas in the furnace enters the furnace from the right breathing cylinder to maintain the air pressure balance, the furnace gas entering the right breathing cylinder lacks oxygen and does not react with the carbon powder and is directly discharged; when the furnace pressure decreases, air enters the furnace from the right breathing cylinder to maintain the air pressure balance, the oxygen in the air entering the right breathing cylinder reacts with the carbon powder to generate CO2, ensuring that the gas in the furnace is in an oxygen-free state, and when the oxygen in the air entering the right breathing cylinder reacts with the carbon powder at the breathing through hole connected to the bottom of the exhaust gas detection cylinder and the internal space of the cylinder, the concentration of the generated CO2 increases inside the exhaust gas detection cylinder; when it is greater than the concentration set by the exhaust gas concentration detector, the reversing valve reverses and is in a position connected with the left breathing cylinder and closed with the right breathing cylinder, at the same time, the resistance wire in the left breathing cylinder is energized and heated, the current of the resistance wire in the right breathing cylinder is disconnected, the carbon powder in the right breathing cylinder is replaced, and the reversing valve is waited for again.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention arranges a breathing valve to allow the atmosphere in the furnace to communicate with the outside world, so that the air pressure in the furnace is the same as that in the outside world, and oxygen is consumed during the circulation process. In this way, there is no need to constantly fill in inert gas, so that true bright annealing can be achieved, there is no oxide layer or decarburization layer on the metal surface, and online continuous production can be carried out, the production efficiency is greatly improved, and the energy cost is significantly reduced.

[0025] The present invention reduces the use of inert gas and reduces energy costs, making the heat treatment furnace of the present invention more economically advantageous. Pollution links such as pickling are omitted, reducing the impact on the environment, which is in line with the development trend of modern green manufacturing. Since oxidation and decarburization are avoided, the metal surface is bright and defect-free, which improves the quality and market competitiveness of the product. The treatment process of the present invention realizes an automated and intelligent heat treatment process by accurately controlling the oxygen concentration and the pressure in the furnace, reducing manual operation, and reducing the difficulty of operation and the error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the material discharging and conveying equipment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the breathing valve of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the left breathing cylinder of the present invention;

[0030] Figure 5 It is an enlarged view of part A of the present invention.

[0031] Among them, 1-transport support frame, 2-furnace body, 21-heat treatment section, 22-one feeding door, 23-two feeding doors, 24-one discharging door, 25-two discharging doors, 26-feeding pre-storage section, 27-discharging pre-storage section, 28-pre-storage section oxygen consumption bag, 29-breathing valve, 291-valve cover, 292-reversing valve, 293-left breathing cylinder, 2931-cylinder body, 2932-waste gas detection cylinder, 2933-breathing hole, 2934-resistance wire, 294-right breathing tube, 295-exhaust gas concentration detector, 30-furnace door retracting and releasing mechanism, 301-door rail, 302-cylinder bracket, 303-telescopic cylinder, 304-movable door panel, 3-feeding conveying equipment, 31-limiting seat, 32-conveying cylinder, 33-hinge, 4-discharging conveying equipment, 41-conveying roller, 42-conveying belt. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0033] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0034] Example 1

[0035] See also Figure 1-5 , a bright heat treatment furnace, comprising the following components:

[0036] Conveying support frame 1: as the base of the entire heat treatment furnace, used to support the furnace body 2 and other components.

[0037] The furnace body 2 is arranged on the top of the conveying support frame 1 and is the main place for heat treatment. The furnace body 2 is divided into three main parts: a heat treatment section 21, a feed pre-storage section 26 and a discharge pre-storage section 27.

[0038] Feed conveying device 3 and discharge conveying device 4:

[0039] Feed conveying device 3: located at the first side of the furnace body 2, used to feed the raw materials to be processed into the furnace. Specifically, it includes a horizontally arranged conveying platform 3, the left end of which is fixed with a limit seat 31 by bolts, a conveying cylinder 32 is horizontally arranged on the right side of the limit seat 31, and a hinge 33 is installed between the conveying cylinder 32 and the limit seat 31 to achieve smooth conveying of the raw materials.

[0040] As a specific example, the feed conveying device 3 is mainly composed of a horizontally arranged conveying platform, which is designed to stably carry and convey the raw materials to be heat treated. A limit seat 31 is fixed to the left end of the conveying platform by bolts. The function of the limit seat 31 is to determine the position of the raw material on the conveying platform to ensure that the raw material enters the feed door 22 correctly. A conveying cylinder 32 is horizontally arranged on one side of the limit seat 31 close to the feed door 22. The conveying cylinder 32 is a key component for driving the raw material from the conveying platform into the feed door 22. A hinge 33 is installed between the conveying cylinder 32 and the limit seat 31. The hinge 33 allows the conveying cylinder 32 to swing within a certain angle range to facilitate the adjustment of the conveying direction and angle of the raw material, ensuring that the raw material enters the feed door 22 smoothly and accurately. The conveying cylinder 32 can be a piston type or a spiral cylinder, and the appropriate type is selected according to needs. One end of the cylinder 32 is fixed to the limit seat 31, and the other end is connected to the conveying platform. When the cylinder 32 works, it pushes the conveying platform to move the raw material toward the feed door 22. The length and width of the conveying platform are designed according to the size and weight of the raw material to be processed to ensure the stability of the raw material during the entire conveying process. The size and thrust of the conveying cylinder 32 are also selected according to the weight of the conveying platform and the raw material to ensure effective conveying. The limit seat 31 and the hinge 33 are usually made of high-strength steel to ensure durability and reliability under high temperature and heavy load conditions. The conveying cylinder 32 can be controlled by a control system, which can be manual or automatic. In automated operation, the movement of the cylinder 32 can be precisely controlled by sensors and controllers to ensure timely and accurate delivery of the raw material. Through the above example, the feed conveying device 3 can efficiently and accurately feed the raw material to be heat treated into the furnace body, providing reliable feeding guarantee for continuous bright heat treatment. This design not only improves the degree of automation of the heat treatment process, but also reduces the need for manual operation, reducing operating costs and error rates.

[0041] The material discharging conveying device 4 is located at the second side of the furnace body 2 and is used to convey the processed raw materials out of the furnace. It includes two sets of conveying rollers 41, which are symmetrically arranged on the left and right. A conveying belt 42 is sleeved between the outer walls of the two sets of conveying rollers 41. A conveying motor is installed at one end of the shaft of the conveying roller 41 to drive the conveying belt 42 to move.

[0042] As a specific example, the discharge conveying device 4 is mainly composed of two groups of conveying rollers 41, which are designed to convey the heat-treated raw materials from the furnace to the outside of the furnace. The two groups of conveying rollers 41 are arranged symmetrically on the left and right to ensure the stable operation of the conveyor belt 42 on the center line and reduce the possibility of deviation, which is crucial to ensure the uniformity and continuity of the discharge. The conveyor belt 42 is sleeved between the outer walls of the two groups of conveying rollers 41 to form a closed loop. The conveyor belt 42 can be made of heat-resistant material to meet the transportation requirements of high-temperature raw materials after heat treatment. A conveying motor is installed at one end of the shaft of each group of conveying rollers 41. The selection of the conveying motor is based on the required conveying speed and the weight of the raw materials to ensure that there is enough power to drive the conveyor belt 42 and the raw materials. The conveying roller 41 can be a solid steel roller or a hollow roller, and the surface can be specially treated to increase wear resistance and heat resistance. The diameter and length of the roller are designed according to the width of the conveyor belt 42 and the size of the raw materials. The conveying motor can be speed-controlled by a frequency converter or other speed regulating device to adapt to the conveying requirements of raw materials at different heat treatment stages and ensure the smoothness and controllability of the discharging process. The tension of the conveyor belt 42 can be adjusted by a tensioning device to ensure stability and reduce slippage during operation. Regular maintenance and inspection are also necessary to ensure the long-term stable operation of the conveying system. The conveyor roller 41 is fixed to the discharging end of the furnace body 2 by a bracket. The bracket design should ensure the parallelism and horizontality of the roller to reduce the wear of the conveyor belt 42 and extend its service life. The discharging conveying equipment 4 should be equipped with necessary safety protection devices, such as emergency stop buttons, protective covers, etc., to protect the safety of operators. The conveyor belt 42 should be designed to be easy to replace and maintain to reduce downtime and improve production efficiency. The discharging conveying equipment 4 can reliably transport the heat-treated raw materials from the furnace to the outside of the furnace, ensuring the continuity and efficiency of the discharging process. This design not only improves the automation level of the heat treatment line, but also reduces the operating cost and maintenance difficulty, providing a strong guarantee for the stable operation of the heat treatment production line.

[0043] Heat treatment section 21: The heat treatment section 21 is the central part of the furnace body 2 and is used to heat treat the raw materials. On both sides of the heat treatment section 21, a first feeding door 22 and a second feeding door 23, as well as a first discharging door 24 and a second discharging door 25 are vertically arranged respectively.

[0044] Feed pre-storage section 26 and discharge pre-storage section 27:

[0045] The feed pre-storage section 26 is located at the feed side of the heat treatment section 21, and is composed of the area between the first feed door 22 and the second feed door 23, and is used for temporarily storing the feed.

[0046] The material discharging pre-storage section 27 is located at the material discharging side of the heat treatment section 21, and is composed of the area between the first material discharging door 24 and the second material discharging door 25, and is used for temporarily storing the material discharging.

[0047] Pre-storage oxygen consumption bag 28:

[0048] In the inner cavity of the feed pre-storage section 26 and the discharge pre-storage section 27, there are pre-storage section oxygen consumption bags 28 suspended. These oxygen consumption bags contain carbon powder and resistance wire 2934, which are used to consume oxygen in the furnace to prevent metal oxidation. The oxygen consumption rate is: 5 cubic meters of oxygen can be consumed per hour to ensure that the atmosphere in the furnace is oxygen-free. Metal surface brightness: The surface brightness of the treated metal is increased by 30%, and there is no oxidation layer and decarburization layer.

[0049] Breathing valve 29:

[0050] A breathing valve 29 is vertically installed on the top of the heat treatment section 21, the feed pre-storage section 26 and the discharge pre-storage section 27. The breathing valve 29 includes a valve cover 291, a reversing valve 292 is installed on the top of the inner cavity, and a left breathing cylinder 293 and a right breathing cylinder 294 are vertically arranged at the bottom of the reversing valve 292. Two sets of exhaust gas concentration detectors 295 are arranged above the breathing valve 29, which are respectively connected to the left breathing cylinder 293 and the right breathing cylinder 294 to monitor the oxygen concentration in the furnace. Gas exchange efficiency: 10 gas exchanges can be completed per hour to ensure a stable atmosphere in the furnace. Oxygen concentration control: The oxygen concentration in the furnace can be maintained below 10ppm to ensure an oxygen-free environment.

[0051] As a specific example, the breathing valve 29 is a key component used to control the exchange of the atmosphere in the furnace with the outside world in the present invention, and is composed of a valve cover 291, a reversing valve 292, a left breathing tube 293 and a right breathing tube 294. The valve cover 291 is the main structure of the breathing valve 29, and a reversing valve 292 is installed on the top of its inner cavity to control the flow direction of the gas and ensure the balance between the gas in the furnace and the outside world. The reversing valve 292 is located at the top of the valve cover 291, and a left breathing tube 293 and a right breathing tube 294 are vertically arranged at the bottom, and these two breathing tubes are responsible for the inhalation and exhalation of the gas respectively. The left breathing tube 293 and the right breathing tube 294 have the same structure, and are symmetrically arranged in the inner cavity of the valve cover 291 about the reversing valve 292 to ensure the uniformity and efficiency of gas exchange. Two groups of exhaust gas concentration detectors 295 are arranged above the valve cover 291, which are connected to the left breathing tube 293 and the right breathing tube 294 respectively. These detectors are used to monitor the oxygen concentration in the exhaust gas in real time to ensure that the atmosphere in the furnace is controlled in an oxygen-free state. The exhaust gas concentration detector 295 is connected to the top of the left breathing tube 293 and the right breathing tube 294 through a wire. When the detected oxygen concentration reaches a preset value, the reversing valve 292 will automatically reverse to maintain an oxygen-free environment in the furnace. When the furnace pressure increases, the gas in the furnace is discharged through the right breathing tube 294 to maintain the air pressure balance; when the furnace pressure decreases, air enters the furnace through the right breathing tube 294 and reacts with carbon powder to generate CO2 to maintain an oxygen-free state in the furnace.

[0052] As a specific example, the left breathing cylinder 293 is composed of a cylinder 2931 and an exhaust gas detection cylinder 2932, and the side walls of these two parts are connected together by a fixed connection method such as welding to form a stable structure. Breathing holes 2933 are provided on the side wall of the cylinder 2931, which are channels for gas to enter and exit the left breathing cylinder 293, ensuring that the gas can flow smoothly. The breathing holes 2933 are connected to the inner cavity of the exhaust gas detection cylinder 2932, so that the exhaust gas can enter the exhaust gas detection cylinder 2932 for detection. The inner cavity of the cylinder 2931 and the inner cavity of the pre-storage section oxygen consumption bag 28 are both provided with a resistance wire 2934 and carbon powder. The resistance wire 2934 generates heat after being energized, which is used to promote the reaction of carbon powder with oxygen to generate CO2, thereby consuming oxygen in the furnace. The energization of the resistance wire 2934 can be controlled by a temperature control system to ensure that the reaction is carried out at an appropriate temperature to avoid overheating or underheating. In order to maintain the normal operation of the breathing valve 29, it is necessary to regularly check and replenish the carbon powder, and replace it when the carbon powder is exhausted. The exhaust gas detection cylinder 2932 is equipped with a sensor for real-time monitoring of the oxygen concentration in the exhaust gas and transmitting the data to the control system so as to adjust the working state of the resistance wire 2934.

[0053] Furnace door retracting and extending mechanism 30:

[0054] The tops of the first feeding door 22, the second feeding door 23, the first discharging door 24 and the second discharging door 25 are all equipped with a furnace door retracting and releasing mechanism 30. The furnace door retracting and releasing mechanism 30 comprises a door rail 301, a cylinder bracket 302 is fixed to the top of the door rail 301 by bolts, a telescopic cylinder 303 is vertically installed in the inner cavity of the cylinder bracket 302, a movable door plate 304 is installed at the telescopic end of the bottom of the telescopic cylinder 303, and the movable door plate 304 is arranged in the inner cavity of the door rail 301 to control the opening and closing of the furnace door.

[0055] As a specific example, the furnace door retracting and releasing mechanism 30 includes the following components: the door rail 301 is a fixed part of the furnace door retracting and releasing mechanism 30, which constitutes the track for the movable door panel 304 to move. The door rail 301 is usually made of a strong material, such as a steel structure, to ensure stability and durability under high temperature and heavy load conditions. The cylinder bracket 302 is fixed to the top of the door rail 301 and connected to the door rail 301 by bolts. The cylinder bracket 302 is used to support and position the telescopic cylinder 303 to ensure its stable operation. The telescopic cylinder 303 is vertically installed in the inner cavity of the cylinder bracket 302 and is the power source of the furnace door retracting and releasing mechanism 30. The telescopic cylinder 303 can be a single-acting or double-acting cylinder, and the appropriate type and specification are selected according to actual needs. The movable door panel 304 is installed at the bottom telescopic end of the telescopic cylinder 303 to realize the opening and closing of the furnace door. The movable door panel 304 is connected to the telescopic cylinder 303 through a connecting piece and slides in the inner cavity of the door rail 301. The movable door panel 304 slides in the inner cavity of the door track 301, and its sliding surface and the inner surface of the door track 301 can be coated with low-friction materials, such as polytetrafluoroethylene, to reduce friction and wear. The edge of the movable door panel 304 can be equipped with a sealing strip to ensure the sealing between the furnace door and the furnace body when the furnace door is closed to prevent gas leakage during the heat treatment process. The movement of the telescopic cylinder 303 can be controlled by a control system, which can be manual or automatic. In automated operation, the movement of the cylinder 303 can be precisely controlled by sensors and controllers to ensure timely and accurate opening and closing of the furnace door. The furnace door retracting and releasing mechanism 30 should be equipped with necessary safety features, such as emergency stop function, overload protection and limit switches to prevent accidental injuries and equipment damage.

[0056] The furnace door retracting mechanism 30 can reliably control the opening and closing of the furnace door, ensure the sealing of the furnace body during the heat treatment process, and improve the safety and convenience of operation. This design not only improves the automation level of the heat treatment line, but also reduces the operating cost and maintenance difficulty, providing a strong guarantee for the stable operation of the heat treatment production line.

[0057] Through the above embodiments, the bright heat treatment furnace of the present invention can realize continuous bright heating without oxidation and decarburization, improve production efficiency, reduce energy costs, and reduce environmental pollution.

[0058] Example 2

[0059] The present invention provides a technical solution: a bright heat treatment furnace, comprising a conveying support frame 1, a furnace body 2 is arranged on the top of the conveying support frame 1, a feeding conveying device 3 is arranged on the left side of the furnace body 2, the feeding conveying device 3 comprises a horizontally arranged conveying platform, and the left end of the conveying platform is fixed to a limited seat 31 by bolts, a conveying cylinder 32 is horizontally arranged on the right side of the limited seat 31, a hinge 33 is installed between the conveying cylinder 32 and the conveying cylinder 32 by bolts, a discharging conveying device 4 is arranged on the right side of the furnace body 2, and the discharging conveying device 4 comprises two groups of conveying rollers 41, and the two groups of conveying rollers 41 are symmetrically arranged on the left and right, a conveying belt 42 is sleeved between the outer walls of the two groups of conveying rollers 41, and one end of the shaft of the conveying roller 41 is arranged A conveying motor is installed, and the furnace body 2 includes a heat treatment section 21. A first feeding door 22 and a second feeding door 23 are vertically arranged on the left side of the heat treatment section 21, and a first discharging door 24 and a second discharging door 25 are vertically arranged on the right side of the heat treatment section 21. The first feeding door 22 and the second feeding door 23 are combined into a feeding pre-storage section 26, and the first discharging door 24 and the second discharging door 25 are combined into a discharging pre-storage section 27. Pre-storage section oxygen consumption bags 28 are hung in the inner cavities of the feeding pre-storage section 26 and the discharging pre-storage section 27. Breathing valves 29 are vertically installed on the tops of the heat treatment section 21, the feeding pre-storage section 26 and the discharging pre-storage section 27. The breathing valve 29 includes a valve cover 291, and the inner cavity top of the valve cover 291 is installed with The reversing valve 292 and the bottom of the conveying chamber reversing valve 292 are respectively vertically provided with a left breathing cylinder 293 and a right breathing cylinder 294, and two sets of exhaust gas concentration detectors 295 are arranged above the valve cover 291, and the two sets of exhaust gas concentration detectors 295 are respectively connected to the top of the left breathing cylinder 293 and the top of the right breathing cylinder 294 through wires, the structures of the left breathing cylinder 293 and the right breathing cylinder 294 are opposite, and the right breathing cylinder 294 and the right breathing cylinder 294 are symmetrically arranged in the inner cavity of the valve cover 291 with respect to the reversing valve 292, the left breathing cylinder 293 includes a cylinder body 2931 and an exhaust gas detection cylinder 2932, and the side walls of the cylinder body 2931 and the exhaust gas detection cylinder 2932 are welded and fixed together, and the cylinder body 2 A breathing hole 2933 is provided on the side wall of 931, and the breathing hole 2933 is connected to the inner cavity of the exhaust gas detection cylinder 2932. The inner cavity of the cylinder 2931 and the inner cavity of the pre-storage section oxygen consumption bag 28 are both provided with a resistance wire 2934 and carbon powder. The tops of the first feeding door 22, the second feeding door 23, the first discharging door 24 and the second discharging door 25 are all equipped with a furnace door retracting and extending mechanism 30. The furnace door retracting and extending mechanism 30 includes a door rail 301, and a cylinder bracket 302 is fixed to the top of the door rail 301 by bolts. A telescopic cylinder 303 is vertically installed in the inner cavity of the cylinder bracket 302, and a movable door panel 304 is installed at the bottom telescopic end of the telescopic cylinder 303, and the movable door panel 304 is arranged in the inner cavity of the door rail 301.

[0060] Example 3

[0061] A treatment process using a bright heat treatment furnace comprises the following steps:

[0062] When the bright heating furnace is performing heat treatment without feeding and discharging materials, the first feeding door 22, the second feeding door 23, the first discharging door 24, and the second discharging door 25 are in a closed and sealed state, and the raw materials to be heat treated are transported to the outside of the first feeding door 22 by the feeding conveying device 3. Under the lifting action of the furnace door retracting and releasing mechanism 30, the first feeding door 22 is opened, and the raw materials to be heat treated enter the feed pre-storage section 26. The furnace door retracting and releasing mechanism 30 is lowered, and the first feeding door 22 is closed. The resistance wire 2934 in the pre-storage section oxygen consumption bag 28 in the feed pre-storage section 26 is energized, and the temperature is 1000°C. The carbon powder in the pre-storage section oxygen consumption bag 28 in the feed pre-storage section 26 reacts with the oxygen in the feed pre-storage section 26 to generate CO2;

[0063] The oxygen concentration in the feed pre-storage section 26 is measured by the exhaust gas concentration detector 295 on the breathing valve 29 in the feed pre-storage section 26. When the process requirements are met, the resistance wire in the pre-storage section oxygen consumption bag 28 in the feed pre-storage section 26 is closed. When the heat treatment section needs to be fed according to the production situation, the second feed door 23 is opened, and the raw materials to be heat-treated in the feed pre-storage section 26 enter the heat treatment section 21 through the conveying support frame 1, and the second feed door 23 is closed;

[0064] After the heat treatment of the heat-treated raw materials is completed, the first discharge door 24 is opened, and the heat-treated raw materials pass through the conveying support frame 1 to enter the discharge pre-storage section 27, and the first discharge door 24 is closed. When the heat-treated raw materials need to be discharged from the furnace, the second discharge door 25 is opened, and the heat-treated raw materials are sent to the outside of the second discharge door 25 through the conveying support frame 1, and the second discharge door 25 is closed, and the oxygen consumption bag 28 in the pre-storage section 27 of the discharge pre-storage section is energized, and the oxygen consumption process is carried out until the power is turned off after passing the oxygen consumption process, and the raw materials waiting for the next heat treatment pass through the discharge conveying equipment 4 to enter the discharge pre-storage section 27;

[0065] When the breathing valve 29 is working, the reversing valve 292 is in a position connected with the right breathing cylinder 294 and closed with the left breathing cylinder 293. The resistance wire 2934 in the right breathing cylinder 294 is energized and heated. When the furnace pressure increases, the gas in the furnace enters the air from the right breathing cylinder 294 to maintain the air pressure balance. The furnace gas entering the right breathing cylinder 294 lacks oxygen and does not react with the carbon powder and is directly discharged; when the furnace pressure decreases, the air enters the furnace from the right breathing cylinder 294 to maintain the air pressure balance. The oxygen in the air entering the right breathing cylinder 294 reacts with the carbon powder to generate CO2, ensuring that the gas in the furnace is in an oxygen-free state. When the oxygen in the air of 94 reacts with the carbon powder at the breathing hole 2933 which is connected to the internal space of the cylinder 2931 at the bottom of the exhaust gas detection cylinder 2392, the concentration of the generated CO2 increases inside the exhaust gas detection cylinder 2392; when it is greater than the concentration set by the exhaust gas concentration detector 295, the reversing valve 292 is reversed and is in a position connected to the left breathing cylinder 293 and closed to the right breathing cylinder 294. At the same time, the resistance wire 2934 in the left breathing cylinder 293 is energized and heated, and the current of the resistance wire 2934 in the right breathing cylinder 294 is disconnected, the carbon powder in the right breathing cylinder 294 is replaced, and the reversing valve 292 is waited for to be reversed again.

[0066] The furnace body under this production process is not damaged by any air pressure problem during use, and the surface of the capillary tube is bright, without oxide film and decarburization. It eliminates the pickling pollution link after each heating, shortens the process flow, reduces the amount of machining cutting, reduces energy consumption, and improves the product qualification rate, which is suitable for large-scale production of high-end bearings.

[0067] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A bright heat treatment furnace, comprising: Conveyor support frame (1), A furnace body (2) is arranged on the top of the conveying support frame (1), a first side of the furnace body (2) is provided with a feed conveying device (3), a second side of the furnace body (2) is provided with a discharge conveying device (4), a heat treatment section (21) is located between the two, a first feed door (22) and a second feed door (23) are vertically arranged on one side of the heat treatment section (21) close to the feed conveying device (3), a first discharge door (24) and a second discharge door (25) are vertically arranged on one side of the heat treatment section (21) close to the discharge conveying device (4), a feed pre-storage section (26) is formed between the first feed door (22) and the second feed door (23), a discharge pre-storage section (27) is formed between the first discharge door (24) and the second discharge door (25), Among them, the inner cavities of the feed pre-storage section (26) and the discharge pre-storage section (27) are both suspended with pre-storage section oxygen-consuming bags (28), the tops of the heat treatment section (21), the feed pre-storage section (26) and the discharge pre-storage section (27) are vertically installed with breathing valves (29), and the tops of the first feed door (22), the second feed door (23), the first discharge door (24) and the second discharge door (25) are all installed with furnace door retracting and releasing mechanisms (30).

2. A bright heat treatment furnace according to claim 1, characterized in that: The feed conveying device (3) comprises a horizontally arranged conveying platform, and the left end of the conveying platform is fixed with a limit seat (31) by bolts, and a conveying cylinder (32) is horizontally arranged on the side of the limit seat (31) close to the feed door (22), and a hinge (33) is installed between the conveying cylinder (32) and the limit seat (31).

3. A bright heat treatment furnace according to claim 1, characterized in that: The discharging conveying device (4) comprises two groups of conveying rollers (41), and the two groups of conveying rollers (41) are symmetrically arranged on the left and right, a conveying belt (42) is sleeved between the outer walls of the two groups of conveying rollers (41), and a conveying motor is installed at one end of the shaft of the conveying roller (41).

4. A bright heat treatment furnace according to claim 1, characterized in that: The breathing valve (29) comprises a valve cover (291), a reversing valve (292) is installed on the top of the inner cavity of the valve cover (291), a left breathing cylinder (293) and a right breathing cylinder (294) are vertically arranged at the bottom of the reversing valve (292), and two groups of exhaust gas concentration detectors (295) are arranged above the valve cover (291), one group of exhaust gas concentration detectors (295) is connected to the left breathing cylinder (293), and the other group of exhaust gas concentration detectors (295) is connected to the right breathing cylinder (294).

5. A bright heat treatment furnace according to claim 4, characterized in that: The left breathing cylinder (293) and the right breathing cylinder (294) have the same structure, and the left breathing cylinder (293) and the right breathing cylinder (294) are symmetrically arranged in the inner cavity of the valve cover (291) with respect to the reversing valve (292).

6. A bright heat treatment furnace according to claim 5, characterized in that: The left breathing cylinder (293) comprises a cylinder body (2931) and an exhaust gas detection cylinder (2932); the cylinder body (2931) and the side wall of the exhaust gas detection cylinder (2932) are fixedly connected; the side wall of the cylinder body (2931) is provided with a breathing hole (2933); the breathing hole (2933) is communicated with the inner cavity of the exhaust gas detection cylinder (2932); the inner cavity of the cylinder body (2931) and the inner cavity of the pre-storage stage oxygen consumption bag (28) are both provided with a resistance wire (2934) and carbon powder.

7. A bright heat treatment furnace according to claim 1, characterized in that: The furnace door retracting and extending mechanism (30) comprises a door rail (301), a cylinder bracket (302) is fixed to the top of the door rail (301) by bolts, a telescopic cylinder (303) is vertically installed in the inner cavity of the cylinder bracket (302), a movable door plate (304) is installed at the bottom telescopic end of the telescopic cylinder (303), and the movable door plate (304) is arranged in the inner cavity of the door rail (301).

8. A bright heat treatment furnace treatment process, based on the bright heat treatment furnace according to any one of claims 1 to 7, characterized in that: The following steps are involved: When the bright heating furnace is heat treated and no material is required to be fed in or out, the first feed door (22), the second feed door (23), the first discharge door (24), and the second discharge door (25) are in a closed and sealed state, and the raw materials to be heat treated are transported to the outside of the first feed door (22) by the feed conveying device (3). Under the lifting action of the furnace door retracting and releasing mechanism (30), the first feed door (22) is opened, and the raw materials to be heat treated enter the feed pre-storage section (26). The furnace door retracting and releasing mechanism (30) is lowered, and the first feed door (22) is closed. The resistance wire (2934) in the pre-storage section oxygen consumption bag (28) in the feed pre-storage section (26) is energized, and the carbon powder in the pre-storage section oxygen consumption bag (28) in the feed pre-storage section (26) reacts with the oxygen in the feed pre-storage section (26) to generate CO2; The oxygen concentration in the feed pre-storage section (26) is measured by an exhaust gas concentration detector (295). When the oxygen concentration reaches the process requirement, the resistance wire in the pre-storage section oxygen consumption bag (28) in the feed pre-storage section (26) is closed. When the heat treatment section (21) needs to feed materials according to the production situation, the second feed door (23) is opened. The raw materials to be heat-treated in the feed pre-storage section (26) enter the heat treatment section (21) through the conveying support frame (1), and the second feed door (23) is closed; After the heat treatment of the heat-treated raw materials is completed, the first discharge door (24) is opened, and the heat-treated raw materials pass through the conveying support frame (1) into the discharge pre-storage section (27), the first discharge door (24) is closed, and the second discharge door (25) is opened. When the heat-treated raw materials need to be discharged from the furnace, they are sent to the outside of the second discharge door (25) through the discharge conveying equipment (4), and the second discharge door (25) is closed. The oxygen consumption bag (28) in the pre-storage section (27) of the discharge pre-storage section is energized, and the oxygen consumption process is carried out until the power is turned off after passing the oxygen consumption process, and the raw materials waiting for the next heat treatment pass through the conveying support frame (1) into the discharge pre-storage section (27).

9. The processing process of a bright heat treatment furnace according to claim 8, characterized in that: The following steps are also included: When the breathing valve (29) is working, the reversing valve (292) is in a position connected with the right breathing cylinder (294) and closed with the left breathing cylinder (293), and the resistance wire (2934) in the right breathing cylinder (294) is energized to generate heat. When the furnace pressure increases, the gas in the furnace enters the furnace from the right breathing cylinder (294) to maintain the pressure balance. The gas in the furnace entering the right breathing cylinder (294) lacks oxygen and does not react with carbon powder and is directly discharged; when the furnace pressure decreases, air enters the furnace from the right breathing cylinder (294) to maintain the pressure balance. The oxygen in the air entering the right breathing cylinder (294) reacts with carbon powder to generate CO2, ensuring that the gas in the furnace is in an oxygen-free state. When the oxygen in the air entering the right breathing cylinder (294) reacts with carbon powder at the breathing through hole (2933) connected to the inner space of the cylinder body (2931) at the bottom of the waste gas detection cylinder (2392), the concentration of the generated CO2 increases inside the waste gas detection cylinder (2392); When the concentration is greater than the concentration set by the exhaust gas concentration detector (295), the reversing valve (292) is reversed to a position where it is connected to the left breathing tube (293) and closed to the right breathing tube (294). At the same time, the resistance wire (2934) in the left breathing tube (293) is energized and heated, and the current of the resistance wire (2934) in the right breathing tube (294) is disconnected. The carbon powder in the right breathing tube (294) is replaced, and the reversing of the reversing valve (292) is waited for again.

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