Furnace door assembly for tubular reduction furnace

Abstract

The utility model discloses a furnace door assembly for a tubular reduction furnace. The furnace door assembly comprises a furnace tube, a switch rotating arm and a tension spring assembly, a furnace door is mounted at the orifice of the furnace tube; one end of the switch rotating arm is connected with the furnace door, the other end of the switch rotating arm is connected with a first shaft sleeve, and a switch shaft pin is rotationally sleeved with the first shaft sleeve and connected with the outer wall of the furnace tube; a first oil injection port is formed in the surface of the first shaft sleeve; and the other end of the tension spring assembly is connected with the outer wall of the furnace tube. According to the furnace door assembly, clamping stagnation can be reduced, and the sealing effect is good.

Description

Technical Field

[0001] This utility model relates to the field of reduction furnace technology, and more specifically to a furnace door assembly for a tubular reduction furnace. Background Technology

[0002] The powder metallurgy industry primarily uses tubular furnaces (single-tube / multi-tube) for reduction production. During the reduction process, due to the flow of reducing gas within the furnace, dust is generated inside the furnace tubes due to the influence of gas flow rate and pressure. During the opening and closing of the furnace door, a certain amount of gas overflows from the furnace tubes, forming an air curtain at the furnace door. This air curtain prevents outside air from entering the furnace tubes, affecting the reduction process or product quality, and may even cause safety incidents. The overflowing gas is a mixture containing a significant amount of water vapor and a corrosive atmosphere, predominantly reducing gas. During the gas overflow process, powder inside the furnace tubes is carried away by the overflowing gas and dispersed outside the furnace tubes. This flying dust mainly concentrates around the furnace door or furnace door assembly, eventually depositing on the surface of the furnace door or furnace door assembly. As production continues and time extends, the dust deposited on the surface of the furnace door or furnace door assembly is affected by the gas overflowing when the furnace door is opened. It accumulates more and more on the surface of the furnace door or furnace door assembly, which can easily cause the rotating shaft pin in the assembly to stick or even jam. This can cause the furnace door closing spring rod to deform, thereby affecting the sealing performance of the furnace door, causing leakage of reducing gas, a decline in the quality of reduction products, and in more serious cases, a safety accident.

[0003] Therefore, developing a furnace door assembly for tubular reduction furnaces that can reduce jamming and provide a good seal is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention provides a furnace door assembly for a tubular reduction furnace that can reduce jamming and has a good sealing effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A furnace door assembly for a tubular reduction furnace, comprising:

[0007] Furnace tube, with a furnace door installed at the tube opening;

[0008] A switch arm is provided, with one end connected to the furnace door and the other end connected to a first bushing. A switch pin is rotatably fitted inside the first bushing and is connected to the outer wall of the furnace tube. A first oil inlet is provided on the surface of the first bushing.

[0009] A tension spring assembly, one end of which is connected to the furnace door and the other end of which is connected to the outer wall of the furnace tube.

[0010] The beneficial effects of adopting the above technical solution are that by setting a first bushing at the switch shaft pin and opening a first oil injection port on the surface of the first bushing pin, lubricating oil can be injected periodically, reducing the friction coefficient of the switch shaft pin during rotation, effectively avoiding the problem of switch shaft pin jamming or even seizing due to dust accumulation, and ensuring the normal opening and closing of the furnace door; the setting of the tension spring assembly can provide stable tension for the furnace door, so that the furnace door can fit tightly against the furnace tube when closed, reducing the leakage of reducing gas, ensuring the quality of reduction products, and avoiding safety accidents caused by gas leakage.

[0011] Preferably, a sealing plate is provided on the side of the furnace door that is in closed contact with the furnace tube. The sealing plate further improves the sealing performance between the furnace door and the furnace tube. When the furnace door is closed, the sealing plate can tightly fill the tiny gap between the furnace door and the furnace tube, effectively preventing the leakage of reducing gases inside the furnace and the entry of outside air, thereby better ensuring the smooth progress of the reduction process and the quality of the reduction products, while also helping to maintain stable temperature and pressure inside the furnace.

[0012] Preferably, a push plate is provided at the end of the switch arm that is connected to the switch shaft pin, and the push plate is connected to the switch shaft pin. The push plate provides a more convenient point of force for opening and closing the furnace door. A robotic arm or other operating tool can drive the switch arm to rotate by pushing the push plate, thereby opening and closing the furnace door, making the operation of the furnace door more flexible and convenient, improving production efficiency, and reducing the labor intensity of manual operation.

[0013] Preferably, a tension spring pin is provided at the connection between the furnace door and the tension spring assembly. A second bushing is fitted over the tension spring pin, and the second bushing is connected to the furnace door. The tension spring pin is rotatably connected to the second bushing. This rotatable connection between the tension spring pin and the second bushing allows the tension spring pin to rotate freely under the action of the tension spring assembly, reducing friction and wear between the tension spring pin and the furnace door. Simultaneously, this structure also helps to avoid the problem of tension spring pin jamming due to dust accumulation, further improving the reliability and service life of the furnace door assembly.

[0014] Preferably, the second bushing surface has a second oil inlet. The second oil inlet allows lubricating oil to be injected between the tension spring pin and the second bushing, providing better lubrication for the rotation of the tension spring pin. This not only further reduces the coefficient of friction of the tension spring pin and improves its rotational flexibility, but also effectively prevents jamming caused by dust ingress, thereby better ensuring the normal opening and closing and sealing performance of the furnace door.

[0015] Preferably, the tension spring assembly includes: a tension spring seat, a tension spring rod, and a tension spring; the tension spring seat is hinged to the outer wall of the furnace tube, the interior of the tension spring seat is hollow, one end of the tension spring rod is placed inside the tension spring seat, and the other end is connected to the tension spring shaft pin; the tension spring is sleeved on the outside of the tension spring rod and confined within the tension spring seat. This structural design of the tension spring assembly provides a stable and reliable elastic force for the furnace door. The function of the tension spring is to help the furnace door remain tight when closed, ensuring a sealing effect between the furnace door and the furnace tube; at the same time, the tension spring can also assist the movement of the switch arm during the opening and closing of the furnace door, making the opening and closing of the furnace door smoother, reducing operating force, and improving the convenience and safety of operation.

[0016] Based on the above technical solutions, it can be seen that they are different from existing technologies as follows:

[0017] (1) By setting the first oil inlet and the second oil inlet on the bushing of the switch pin and the tension spring pin respectively, lubricating oil is injected regularly, which effectively reduces the friction coefficient of the pin and avoids the problem of pin jamming or seizing caused by dust deposition, thus ensuring the normal opening and closing of the furnace door.

[0018] (2) A sealing rubber plate is installed on the side where the furnace door and furnace tube are in contact, which further enhances the sealing effect between the furnace door and furnace tube, effectively preventing the leakage of reducing gas in the furnace and the entry of outside air, ensuring the smooth progress of the reduction process and the quality of the reduction product.

[0019] (3) A push plate is provided at one end of the switch arm, which is convenient for the robot or other operating tools to push, making the operation of the furnace door more flexible and convenient, improving production efficiency and reducing the labor intensity of manual operation;

[0020] (4) The structural design of the spring assembly and the oil lubrication measures reduce the wear between the shaft pin and the bushing, improve the reliability and service life of the furnace door assembly, and reduce the maintenance cost of the equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the furnace door assembly in the locked state provided by this utility model;

[0023] Figure 2 A side view of the furnace door assembly in the locked state provided by this utility model;

[0024] Figure 3 A schematic diagram of the furnace door assembly in the open state provided by this utility model;

[0025] Figure 4 A top view of the furnace door assembly provided by this utility model.

[0026] In the figure,

[0027] 1-Furnace tube; 2-Furnace door; 3-Switch arm; 4-First bushing; 5-Switch pin; 6-First oil inlet;

[0028] 7-Tension spring assembly;

[0029] 71-Tension spring seat; 72-Tension spring rod; 73-Tension spring;

[0030] 8-Sealing rubber plate; 9-Push plate; 10-Tension spring pin; 11-Second bushing; 12-Second oil inlet. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] This utility model embodiment discloses a furnace door assembly for a tubular reduction furnace, comprising:

[0033] Furnace tube 1, with furnace door 2 installed at the inlet of furnace tube 1;

[0034] A switch arm 3 is connected at one end to the furnace door 2 and at the other end to a first bushing 4. A switch pin 5 is rotatably fitted inside the first bushing 4 and is connected to the outer wall of the furnace tube 1. A first oil inlet 6 is provided on the surface of the first bushing 4.

[0035] The tension spring assembly 7 has one end connected to the furnace door 2 and the other end connected to the outer wall of the furnace tube 1. Lubricating oil is injected into the first oil inlet 6. When the lubrication capacity is improved, the coefficient of friction of the switch shaft pin 5 is small during rotation, which can achieve flexible rotation, protect the furnace door 2 from deformation of the closing tension spring 73, and achieve the sealing of the furnace door 2.

[0036] To further optimize the above technical solution, a sealing plate 8 is provided on the side of the furnace door 2 that is in closed contact with the furnace tube 1.

[0037] To further optimize the above technical solution, a push plate 9 is provided at the end of the switch arm 3 that is connected to the switch shaft pin 5, and the push plate 9 is connected to the switch shaft pin 5.

[0038] To further optimize the above technical solution, a tension spring pin 10 is provided at the connection between the furnace door 2 and the tension spring assembly 7. A second bushing 11 is sleeved on the outside of the tension spring pin 10. The second bushing 11 is connected to the furnace door 2, and the tension spring pin 10 is rotatably connected to the second bushing 11.

[0039] To further optimize the above technical solution, a second oil injection port 12 is provided on the surface of the second bushing 11. Lubricating oil is injected into the first oil injection port 6 and the second oil injection port 12 to achieve oil lubrication, which solves the problem of poor sealing of the furnace door 2 caused by the jamming of the switch pin 5 and the tension spring pin 10, ensures the quality of the reduction product, and avoids the leakage of reducing gas in the furnace tube 1, which would cause waste or even safety incidents.

[0040] To further optimize the above technical solution, the tension spring assembly 7 includes: a tension spring seat 71, a tension spring rod 72, and a tension spring 73; the tension spring seat 71 is hinged to the outer wall of the furnace tube 1, and the interior of the tension spring seat 71 is hollow; one end of the tension spring rod 72 is placed inside the tension spring seat 71, and the other end is connected to the tension spring shaft pin 10; the tension spring 73 is sleeved on the outside of the tension spring rod 72 and confined within the tension spring seat 71. The function of the tension spring 73 is to provide elastic force to help the furnace door 2 remain tightly closed or to assist in the opening and closing movement.

[0041] When the robotic arm pushes the push plate 9, the push plate 9 will drive the switch arm 3 to rotate. The rotation of the switch arm 3 pulls the tension spring rod 72, causing it to move. The movement of the tension spring rod 72 will stretch the tension spring 73. The elastic force of the tension spring 73 will be transmitted back to the switch arm 3 through the tension spring rod 72. The tension spring 73 can assist the push plate 9 to return to its original position or keep the furnace door 2 closed.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A furnace door assembly for a tubular reduction furnace, characterized in that, include: Furnace tube, with a furnace door installed at the tube opening; A switch arm is provided, with one end connected to the furnace door and the other end connected to a first bushing. A switch pin is rotatably fitted inside the first bushing and is connected to the outer wall of the furnace tube. A first oil inlet is provided on the surface of the first bushing. A tension spring assembly, one end of which is connected to the furnace door and the other end of which is connected to the outer wall of the furnace tube.

2. The furnace door assembly for a tubular reduction furnace according to claim 1, characterized in that, A sealing rubber plate is provided on the side of the furnace door that is in contact with the furnace tube.

3. A furnace door assembly for a tubular reduction furnace according to claim 1, characterized in that, A push plate is provided at one end of the switch arm that is connected to the switch shaft pin, and the push plate is connected to the switch shaft pin.

4. A furnace door assembly for a tubular reduction furnace according to claim 1, characterized in that, A tension spring pin is provided at the connection between the furnace door and the tension spring assembly. A second bushing is sleeved on the outside of the tension spring pin. The second bushing is connected to the furnace door, and the tension spring pin is rotatably connected to the second bushing.

5. A furnace door assembly for a tubular reduction furnace according to claim 4, characterized in that, The second bushing has a second oil inlet on its surface.

6. A furnace door assembly for a tubular reduction furnace according to claim 4, characterized in that, The tension spring assembly includes: a tension spring seat, a tension spring rod, and a tension spring; the tension spring seat is hinged to the outer wall of the furnace tube, the interior of the tension spring seat is hollow, one end of the tension spring rod is placed inside the tension spring seat, and the other end is connected to the tension spring shaft pin; the tension spring is sleeved on the outside of the tension spring rod and confined within the tension spring seat.

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