Natural gas continuous annular forging heating furnace

Abstract

The utility model relates to the technical field of industrial heating furnaces, in particular to a natural gas continuous type annular forging heating furnace which comprises a furnace body and a rotary furnace bottom located in the furnace body, the interior of the furnace body is divided into a preheating area, a heating area and a heat preservation area, and the rotary furnace bottom is driven by a speed reducer to rotate in the circumferential direction. A smoke outlet and a plurality of combustors are arranged in the furnace body, the combustors are arranged at the tops of the heating area and the heat preservation area in the furnace body, the smoke outlet is formed in the top of the preheating area in the furnace body, and the smoke outlet is externally connected with a negative pressure fan; a plurality of supporting pipes are evenly distributed and fixed to the outer wall of the furnace body in the circumferential direction, a circle of heat preservation skin is fixed to an outer ring formed by the multiple supporting pipes, and the space between the heat preservation skin and the outer wall of the furnace body is filled with heat preservation cotton. The heating furnace can effectively improve the energy utilization efficiency, reduce the energy cost consumption, ensure the stable forging temperature in the furnace, and can form an automatic production line with the previous and later procedures to improve the machining efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial heating furnaces, in particular to a natural gas continuous annular forging heating furnace. Background Art

[0002] The natural gas continuous ring forging heating furnace is an industrial furnace specially used for heating metal steel before forging. It uses natural gas as fuel and heats the metal billet to the required forging temperature by continuous heating.

[0003] When the annular heating furnace is working, the billet moves driven by the rotating furnace bottom, passing through the preheating zone, heating zone and insulation zone in the furnace in turn, and the combustion system in the furnace will gradually heat the billet during the movement to improve the plasticity of the billet, making it easier to deform during the forging process, so that it can be made into parts of various shapes and sizes according to the design requirements; at the same time, the high-temperature flue gas generated by the combustion system in the furnace body flows in the opposite direction of the rotation direction of the furnace bottom, so that the billet is heated evenly, reducing the problem of uneven heating. At the same time, the continuous movement of the billet in the furnace can smoothly connect the previous and next processes, thereby facilitating large-scale continuous production and improving production efficiency.

[0004] The prior art "A ring-shaped heating furnace with a partition air curtain device" (publication number: CN100557358C) discloses a heating furnace structure that can continuously heat the blank. However, the prior art still has the following technical problems:

[0005] 1. The flue outlet of the annular heating furnace in the prior art is arranged on the side of the furnace wall of the preheating zone, and the high-temperature flue gas generated by the combustion system in the heating zone is sucked out to the flue outlet of the preheating zone by the attraction of the negative pressure fan. However, since the furnace body is large and the flue gas is a gas, a large amount of flue gas is located above the furnace body, resulting in the need for a very large negative pressure suction force at the flue outlet located at the furnace wall to continuously suck out the high-temperature flue gas, resulting in very large energy consumption and poor flue gas suction effect.

[0006] 2. Since the temperature inside the annular heating furnace is much higher than the ambient temperature when it is working, there is a phenomenon that the heat inside the furnace is dissipated to the outside of the furnace, which will lead to unstable temperature inside the furnace and insufficient forging temperature of the billet, thereby reducing the plasticity of the billet and causing cracks.

[0007] 3. The burner of the annular heating furnace in the prior art is arranged on the furnace wall, and the structure of the burner protrudes from the outside of the furnace wall, which will cause the entire furnace body to occupy a larger area, affecting the utilization rate of the internal space of the factory. At the same time, the burner protruding from the outside of the furnace wall is also easy to be accidentally hit, causing damage to the equipment. Utility Model Content

[0008] The utility model provides a natural gas continuous annular forging heating furnace, which can solve the problems of poor smoke exhaust effect of the annular heating furnace structure in the prior art, resulting in large energy consumption; and easy heat loss in the furnace causing forging cracks in the blank.

[0009] The present application provides the following technical solution: a natural gas continuous annular forging heating furnace, comprising a furnace body and a rotary furnace bottom located inside the furnace body, wherein the furnace body is divided into a preheating zone, a heating zone and a heat preservation zone which are connected end to end in a circumferential direction;

[0010] A discharge port is provided on the outer wall of the furnace body in the heat preservation zone, and a feed port is provided on the outer wall of the furnace body in the preheating zone. The discharge port and the feed port are arranged adjacent to each other. A smoke exhaust port and a plurality of burners are arranged in the furnace body. The burners are arranged at the top of the heating zone and the heat preservation zone in the furnace body. The smoke exhaust port is arranged at the top of the preheating zone in the furnace body, and the smoke exhaust port is arranged corresponding to the feed port. The smoke exhaust port is connected to a negative pressure fan outside.

[0011] A plurality of support tubes are evenly distributed and fixed on the outer wall of the furnace body along the circumferential direction, a circle of thermal insulation skin is fixed on the outer circle formed by the plurality of support tubes, and thermal insulation cotton is filled between the thermal insulation skin and the outer wall of the furnace body.

[0012] Beneficial effects:

[0013] 1. Energy saving: The smoke exhaust port and the feed port of the present application are located in the same vertical plane, so that the billet can be heated by the flue gas as soon as it is put into the billet from the feed port, and the high-temperature flue gas can completely cover the entire preheating zone, thereby ensuring the heat exchange effect of the billet in the furnace body, and helping to improve the heating efficiency of the billet after entering the heating zone; the discharge port and the feed port are arranged adjacent to each other, so that the billet can pass through the complete preheating zone, heating zone and insulation zone from entering the furnace to leaving the furnace, thereby making full use of the space in the furnace; by arranging the smoke exhaust port at the top of the preheating zone, the smoke will naturally flow upward due to its light weight, so the negative pressure suction at the smoke exhaust port will more easily attract and discharge the smoke, thereby ensuring that the smoke can be fully circulated in the furnace. Compared with the prior art in which the smoke exhaust port is arranged on the side of the furnace wall, the present application optimizes the smoke flow path so that the smoke can be discharged with a smaller negative pressure suction, thereby effectively improving energy utilization efficiency and reducing energy consumption.

[0014] 2. Ensure process stability: This application fixes a circle of thermal insulation cotton on the outer wall of the furnace body, which can effectively isolate the high temperature in the furnace from conducting heat to the outside, ensure the stability of the forging temperature in the furnace, avoid forging cracks in the blank due to insufficient temperature, and improve process stability.

[0015] 3. Reduced floor space and higher safety: This application sets the smoke exhaust port and burner on the top of the furnace body, which can reduce the floor space of the entire furnace body and save space. At the same time, it can prevent accidental collision with the burner during work in the factory and cause damage, thereby improving equipment safety.

[0016] Furthermore, the support tube is a square tube, and the insulation skin is made of aluminum skin.

[0017] Beneficial effects: The square tube used for the support tube can provide a larger contact area and enhance the stability of the insulation skin connection. The insulation skin is made of aluminum, which is lighter and more plastic, making it more convenient to install. Aluminum has a lower thermal conductivity coefficient, which helps reduce heat transfer and improves the insulation effect.

[0018] Furthermore, the number of burners in the heating zone is greater than the number of burners in the heat preservation zone.

[0019] Beneficial effect: Using more burners in the heating zone can provide higher heat output, ensuring that the billet can quickly reach the required heating temperature after entering the heating zone, reducing the heating time, while the insulation zone only needs to ensure that the heated billet can be maintained within a certain temperature. Therefore, using fewer burners can save energy and improve energy utilization.

[0020] Furthermore, the number of burners in the heating zone in the furnace body is set to be at least four, and they are evenly distributed along the arc.

[0021] Beneficial effects: The heating zone is the key area for temperature control inside the furnace. The four burners can provide sufficient heat to quickly increase the billet temperature to the required forging temperature. At the same time, the burners are evenly distributed, which helps to achieve uniform heating of the material, reduce temperature gradients, and avoid material performance degradation or deformation caused by local overheating or uneven heating.

[0022] Furthermore, the number of burners in the heat preservation zone in the furnace body is set to be at least two, and they are evenly distributed along the arc.

[0023] Beneficial effect: The number of burners in the insulation zone is less than that in the heating zone, which can ensure that the temperature of the billet remains stable after reaching the target temperature in the heating zone, avoid excessive heating of the billet, keep the billet in the best state before forging, and improve the forging effect.

[0024] Furthermore, the rotation direction of the rotary furnace bottom is opposite to the flow direction of the high-temperature flue gas generated by the burner.

[0025] Beneficial effect: When the billet moves driven by the rotary furnace bottom, the flue gas can continuously preheat the billet head-on, improving the uniformity and preheating effect of the billet.

[0026] Furthermore, a feed port is provided on the furnace body, and the feed port is located on the outer wall of the furnace body in the preheating zone.

[0027] Beneficial effects: Since the high-temperature flue gas will flow from the heating zone and the insulation zone into the preheating zone, the feed port is set in the preheating zone so that the blank can be fully preheated under the action of the high-temperature flue gas, reducing the temperature gradient inside the material and avoiding thermal stress deformation caused by sudden temperature changes. At the same time, the feed port can connect with the previous process and connect with sawing machines, forging machines, etc. to form an automated production line to improve processing efficiency.

[0028] Furthermore, the furnace body is provided with a discharge port, and the discharge port is arranged on the outer wall of the furnace body in the heat preservation zone.

[0029] Beneficial effects: The discharge port is set on the outer wall of the furnace body in the insulation zone, which can ensure that the temperature of the billet is kept constant under the action of the insulation zone before entering the forging process. After the billet is taken out from the discharge port, it is convenient to connect to the subsequent process, such as intelligent manipulator to realize automatic unloading, thereby improving production efficiency.

[0030] Furthermore, a separation wall is provided between the preheating zone and the heat preservation zone, and the feed port and the discharge port are respectively provided on both sides of the separation wall.

[0031] Beneficial effect: Since the preheating zone and the insulation zone are adjacent, the isolation wall can prevent the negative pressure suction of the smoke exhaust port from directly sucking away the smoke in the insulation zone, so that the smoke in the insulation zone can enter the preheating zone from the heating zone in turn, ensuring that the smoke volume in the preheating zone is sufficient and improving the preheating effect.

[0032] Furthermore, a first flow-blocking wall is provided between the heating zone and the preheating zone, and a second flow-blocking wall is provided in the preheating zone near the feed inlet.

[0033] Beneficial effects: The first baffle wall can slow down the rapid flow of flue gas from the heating zone into the preheating zone, prevent the flue gas temperature in the preheating zone from being too high, help control the flue gas temperature in the preheating zone, avoid excessive temperature in the preheating zone, ensure that the blank can be gradually heated up, and reduce thermal shock; and because the feed port is close to the smoke exhaust port, the feed port will be opened when adding materials, so the second baffle wall can slow down the flow speed of the flue gas in the preheating zone toward the feed port, prevent the flue gas in the preheating zone from leaking from the feed port too quickly, reduce heat waste, and improve energy utilization efficiency.

[0034] Furthermore, a multi-axis robot for placing parts is provided at a position corresponding to the feed port, and a multi-axis robot for taking parts is provided at a position corresponding to the discharge port.

[0035] Beneficial effects: The multi-axis robot can connect the previous and next processes, so that the feed port can be connected with sawing machines, forging machines, etc. to form an automated production line, and the discharge port can realize automated unloading, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a top view of the utility model. DETAILED DESCRIPTION

[0037] The following is further described in detail through specific implementation methods:

[0038] The marks in the drawings of the specification include: furnace body 1, rotary furnace bottom 2, smoke exhaust port 3, feed port 4, discharge port 5, insulation zone 6, heating zone 7, burner 8, support tube 9, insulation skin 10, preheating zone 11, isolation wall 12, first baffle wall 13, second baffle wall 14, furnace door cover 15.

[0039] Embodiment 1

[0040] like Figure 1 As shown, a natural gas continuous annular forging heating furnace comprises a furnace body 1 and a rotary furnace bottom 2 located inside the furnace body 1. The rotary furnace bottom 2 is driven by a reducer to rotate circumferentially in the furnace, and can convey parts, including regular parts or special-shaped parts of various sizes and shapes; a plurality of support tubes 9 are fixed to the outer wall of the furnace body 1 with screws, and the support tubes 9 are square tubes, and the plurality of support tubes 9 are evenly distributed along the circumference of the outer wall of the furnace body 1; a circle of insulation skin 10 is fixed to the outer ring formed by the plurality of support tubes 9 with screws, and the material of the insulation skin 10 is aluminum skin, and insulation cotton is filled between the insulation skin 10 and the outer wall of the furnace body 1, and the insulation cotton can reduce the heat loss in the furnace and ensure the stability of the heating temperature in the furnace.

[0041] like Figure 1 As shown, the furnace body 1 is divided into a preheating zone 11, a heating zone 7 and a heat preservation zone 6 which are connected end to end in a circumferential direction. A discharge port 5 is arranged on the outer wall of the furnace body of the heat preservation zone 6, and a feed port 4 is arranged on the outer wall of the furnace body of the preheating zone 11. The discharge port 5 and the feed port 4 are arranged adjacent to each other, and a furnace door cover 15 is arranged on the feed port 4 and the discharge port 5. A separation wall 12 is arranged between the preheating zone 11 and the heat preservation zone 6, and the feed port 4 and the discharge port 5 are respectively arranged on both sides of the separation wall 12. The separation wall 12 is used to separate the preheating zone 11 and the heat preservation zone 6. The heat transfer in the insulation zone 6 ensures the temperature difference, and there is a small gap between the bottom of the isolation wall 12 and the upper surface of the rotary furnace bottom 2, so the isolation wall 12 will not hinder the rotation of the rotary furnace bottom 2; a first baffle wall 13 is arranged between the heating zone 7 and the preheating zone 11, and a second baffle wall 14 is arranged near the feed port 4 in the preheating zone 11. There is a gap between the bottom of the first baffle wall 13 and the bottom of the second baffle wall 14 and the surface of the rotary furnace bottom 2, and the gap can allow the billet to pass smoothly when placed on the rotary furnace bottom 2.

[0042] The top of the furnace body 1 is provided with a smoke exhaust port 3 and a plurality of burners 8 (the burner 8 is commonly known as a "burner nozzle" in the industry, which is a prior art and its structure is not described in detail here). The burner 8 is arranged at the top of the heating zone 7 and the insulation zone 6 in the furnace body 1. The number of burners 8 in the heating zone 7 is more than that in the insulation zone 6. The number of burners 8 in the heating zone 7 is set to four, and the number of burners 8 in the insulation zone 6 is set to two, all of which are evenly spaced along the arc. The smoke exhaust port 3 is arranged at the top of the preheating zone 11 in the furnace body 1, and the smoke exhaust port 3 is connected to a negative pressure fan; a feed port 4 is arranged on the outer wall of the preheating zone 11 of the furnace body 1, and a discharge port 5 is arranged on the outer wall of the insulation zone 6 of the furnace body 1. The rotation direction of the rotary furnace bottom 2 is as follows: Figure 1 under the negative pressure of the exhaust port 3, the flow direction of the high-temperature flue gas generated by the burner 8 is opposite to the direction of rotation of the rotary furnace bottom 2, which is counterclockwise, thereby facilitating contact between the flue gas and the entering parts to achieve heat exchange.

[0043] The working process of this device is as follows:

[0044] The blank is put into the rotary furnace bottom 2 in the furnace body 1 from the feed port 4, and driven by the rotation of the rotary furnace bottom 2, it enters the preheating zone 11, the heating zone 7 and the insulation zone 6 in sequence. The burner 8 located above the furnace top of the heating zone 7 and the insulation zone 6 will generate flames to heat the blanks in the rotary furnace bottom 2 below. In this process, the high-temperature flue gas generated by the combustion of the burner 8 will flow from the heating zone 7 and the insulation zone 6 to the preheating zone 11 under the negative pressure of the exhaust port 3, thereby continuously preheating the blanks in the preheating zone 11 head-on, and then the flue gas is discharged from the exhaust port 3; after the blank finally enters the insulation zone 6, it can be taken out from the discharge port 5 for the next step.

[0045] Embodiment 2

[0046] The difference between this embodiment and the first embodiment is that a multi-axis robot for placing parts is provided at the corresponding position of the feed port 4, and a multi-axis robot for taking parts is provided at the corresponding position of the discharge port 5. The multi-axis robot is preferably a six-axis robot, so that the heating furnace can connect the previous and next processes to form an automated production line, thereby improving production efficiency.

[0047] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A natural gas continuous annular forging heating furnace, comprising a furnace body and a rotary furnace bottom located inside the furnace body, wherein the furnace body is divided into a preheating zone, a heating zone and a heat preservation zone which are connected end to end in a circumferential direction; the characteristics are: A discharge port is provided on the outer wall of the furnace body in the heat preservation zone, and a feed port is provided on the outer wall of the furnace body in the preheating zone. The discharge port and the feed port are arranged adjacent to each other. A smoke exhaust port and a plurality of burners are arranged in the furnace body. The burners are arranged at the top of the heating zone and the heat preservation zone in the furnace body. The smoke exhaust port is arranged at the top of the preheating zone in the furnace body, and the smoke exhaust port is arranged corresponding to the feed port. The smoke exhaust port is connected to a negative pressure fan outside. A plurality of support tubes are evenly distributed and fixed on the outer wall of the furnace body along the circumferential direction, a circle of thermal insulation skin is fixed on the outer circle formed by the plurality of support tubes, and thermal insulation cotton is filled between the thermal insulation skin and the outer wall of the furnace body.

2. The natural gas continuous annular forging heating furnace according to claim 1, characterized in that: The support tube is a square tube, and the insulation skin is made of aluminum.

3. The natural gas continuous annular forging heating furnace according to claim 2, characterized in that: The number of burners in the heating zone is greater than the number of burners in the heat preservation zone.

4. The natural gas continuous annular forging heating furnace according to claim 3 is characterized in that: The number of burners in the heating zone of the furnace body is set to be at least four and is evenly distributed along the arc.

5. The natural gas continuous annular forging heating furnace according to claim 4, characterized in that: The number of burners in the heat preservation zone of the furnace body is at least two and they are evenly distributed along the arc.

6. The natural gas continuous annular forging heating furnace according to claim 5, characterized in that: The rotation direction of the rotary furnace bottom is opposite to the flow direction of the high-temperature flue gas generated by the burner.

7. The natural gas continuous annular forging heating furnace according to claim 6, characterized in that: A separation wall is arranged between the preheating zone and the heat preservation zone, and the feed inlet and the discharge outlet are arranged on both sides of the separation wall respectively.

8. The natural gas continuous annular forging heating furnace according to claim 7, characterized in that: A first flow-blocking wall is arranged between the heating zone and the preheating zone, and a second flow-blocking wall is arranged near the feed inlet in the preheating zone.

9. The natural gas continuous annular forging heating furnace according to claim 8, characterized in that: A multi-axis robot for placing parts is provided at the corresponding position of the feed port, and a multi-axis robot for taking parts is provided at the corresponding position of the discharge port.

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