Gas curtain sealing device of preheating furnace

Abstract

The utility model provides a preheating furnace air curtain sealing device which is arranged in butt joint with an inlet of a preheating furnace, the preheating furnace air curtain sealing device comprises a sealing bin and an air inducing assembly, a sealing chamber in butt joint with the inlet is arranged in the sealing bin, the air inducing assembly is communicated with the top of the sealing chamber, and the air inducing assembly is arranged in the sealing bin. When the air inducing assembly works, an air curtain is formed in the sealing chamber, and a workpiece is conveyed to pass through the air curtain in the preheating furnace air curtain sealing device and then reaches the inlet. The preheating furnace air curtain sealing device can effectively prevent external cold air from entering the preheating furnace, the sealing effect is enhanced, and the influence of the external environment on the temperature and gas components in the preheating furnace is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field related to preheating furnaces, and more precisely to an air curtain sealing device for a preheating furnace. Background Art

[0002] The preheating furnace is generally used as a pre-treatment furnace for workpiece heat treatment to preheat the workpiece to improve the efficiency of subsequent heat treatment, and at the same time help improve the quality of the workpiece product. The preheating furnace needs to accurately control the internal temperature, and it is necessary to prevent external oxygen from entering the furnace and affecting the quality of the workpiece. Therefore, a sealing device needs to be set at the feeding end of the preheating furnace to reduce the impact of the external environment on the temperature and gas composition in the furnace. The existing preheating furnace sealing device generally adopts mechanical sealing methods such as furnace doors, which are not ideal in terms of sealing effect.

[0003] In summary, the art needs to improve the existing preheating furnace sealing device to enhance the sealing effect. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a preheating furnace air curtain sealing device, which is connected to the feed port of the preheating furnace and forms an air curtain through an air induced structure to prevent cold air from entering the interior of the preheating furnace.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a preheating furnace air curtain sealing device, which is connected to the entrance of the preheating furnace, and the preheating furnace air curtain sealing device includes a sealing bin and an air induced draft component. The sealing bin has a sealing chamber connected to the entrance, and the air induced draft component is connected to the top of the sealing chamber. When the air induced draft component is working, an air curtain is formed inside the sealing chamber, and the workpiece is transported through the air curtain inside the preheating furnace air curtain sealing device and then reaches the entrance.

[0006] Preferably, the induced draft assembly includes an induced draft fan and an induced draft duct, the induced draft fan is arranged on the side of the sealed bin, the induced draft fan is connected to the top of the sealed bin through the induced draft duct, and the induced draft duct is in communication with the sealed chamber.

[0007] Preferably, the induced draft fan is frequency-controlled by a controller, an air pressure monitoring device is arranged inside the preheating furnace, the air pressure monitoring device is connected to the controller, and the controller controls the operating frequency of the induced draft fan according to the internal pressure of the preheating furnace monitored by the air pressure monitoring device, so as to maintain the internal air pressure of the sealed chamber consistent with that of the preheating furnace.

[0008] Preferably, a conveyor belt is arranged inside the sealing chamber, and two ends of the conveyor belt are respectively connected to the feeding port of the sealing chamber and the feeding port.

[0009] Preferably, the conveyor belt is a hollow mesh belt.

[0010] Preferably, a plurality of material baskets are placed on the conveyor belt, and the workpieces are placed inside the material baskets.

[0011] Preferably, a metal sealing curtain is provided inside the sealed chamber, the metal sealing curtain is connected to the top of the sealed chamber, and the metal sealing curtain is located between the air curtain and the inlet; when the material basket passes through the metal sealing curtain, the top of the material basket contacts the bottom of the metal sealing curtain.

[0012] Preferably, a furnace door is provided at the material inlet of the sealed chamber.

[0013] Preferably, the sealed chamber is filled with an inert gas.

[0014] Compared with the prior art, the advantages of the preheating furnace air curtain sealing device disclosed by the utility model are: the preheating furnace air curtain sealing device can effectively block external cold air from entering the interior of the preheating furnace, enhance the sealing effect, and reduce the influence of the external environment on the temperature and gas composition in the preheating furnace; the preheating furnace air curtain sealing device can control the internal air pressure of the device by controlling the flow rate of the induced draft fan to make it consistent with the internal air pressure of the preheating furnace, thereby preventing the heat inside the preheating furnace from being sucked away. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] like Figure 1 The figure shows a side view of a preheating furnace air curtain sealing device of the utility model.

[0017] like Figure 2 The figure shows a front view of a preheating furnace air curtain sealing device of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 and Figure 2As shown, the present application discloses a preheating furnace air curtain sealing device which is docked with the inlet 10 of the preheating furnace 1. The preheating furnace air curtain sealing device comprises a sealing chamber 2 and an air induction assembly. The sealing chamber 2 has a sealing chamber 20 docked with the inlet 10. The air induction assembly is connected to the top of the sealing chamber 30. When the air induction assembly is working, an air curtain 30 is formed inside the sealing chamber 20. The workpiece is transported through the air curtain 30 inside the preheating furnace air curtain sealing device and then reaches the inlet 10. The air curtain 30 can isolate the outside air and prevent the outside environment from affecting the temperature and gas composition inside the preheating furnace 1.

[0020] Specifically, the induced draft assembly includes an induced draft fan 31 and an induced draft duct 32 . The induced draft fan 31 is disposed on the side of the sealed bin 2 . The induced draft fan 31 is connected to the top of the sealed bin 2 through the induced draft duct 32 . The induced draft duct 32 is communicated with the sealed chamber 20 .

[0021] The induced draft fan 31 is frequency-controlled by the controller. An air pressure monitoring device is arranged inside the preheating furnace 1. The air pressure monitoring device is connected to the controller. The controller controls the working frequency of the induced draft fan 31 according to the internal pressure of the preheating furnace monitored by the air pressure monitoring device, maintains the internal air pressure of the sealed chamber 20 and the preheating furnace 1 consistent, and prevents the induced draft fan 31 from absorbing the internal heat of the preheating furnace 1 and affecting the heating effect.

[0022] A conveyor belt 21 is arranged inside the sealed chamber 20, and two ends of the conveyor belt 21 are respectively connected to the feed port of the sealed chamber 20 and the feed port 10. The workpiece is transported to the preheating furnace 1 through the conveyor belt 21. The conveyor belt 21 is a hollow mesh belt for the airflow of the air curtain 30 to pass through.

[0023] Preferably, a furnace door 23 is provided at the material inlet of the sealed chamber 20 to provide a certain sealing effect on the interior of the sealed chamber 20. The furnace door 23 can be a flap-type furnace door or a sliding furnace door.

[0024] A plurality of material baskets 22 are placed on the conveyor belt 21, and workpieces are placed inside the material baskets 22. Preferably, a metal sealing curtain 200 is arranged inside the sealing chamber 20, and the metal sealing curtain 200 is connected to the top of the sealing chamber 20, and the metal sealing curtain 200 is located between the air curtain 30 and the inlet 10. When the material basket 22 passes through the metal sealing curtain 200, the top of the material basket 22 contacts the bottom of the metal sealing curtain 200, further enhancing the sealing effect.

[0025] Preferably, the sealed chamber 20 is filled with an inert gas, and an inert gas curtain is formed under the action of the draft assembly to prevent oxygen and the like from entering the preheating furnace 1. The inert gas may be nitrogen.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preheating furnace air curtain sealing device, characterized in that: The air curtain sealing device for the preheating furnace is connected to the entrance of the preheating furnace, and includes a sealing chamber and an air induced draft component. The sealing chamber has a sealing chamber connected to the entrance, and the air induced draft component is connected to the top of the sealing chamber. When the air induced draft component is in operation, an air curtain is formed inside the sealing chamber. The workpiece is transported through the air curtain inside the air curtain sealing device for the preheating furnace and then reaches the entrance.

2. The preheating furnace air curtain sealing device according to claim 1, characterized in that: The induced draft assembly includes an induced draft fan and an induced draft duct. The induced draft fan is arranged on the side of the sealed bin. The induced draft fan is connected to the top of the sealed bin through the induced draft duct, and the induced draft duct is in communication with the sealed chamber.

3. The preheating furnace air curtain sealing device according to claim 2, characterized in that: The induced draft fan is frequency-controlled by a controller. An air pressure monitoring device is arranged inside the preheating furnace. The air pressure monitoring device is connected to the controller. The controller controls the operating frequency of the induced draft fan according to the internal pressure of the preheating furnace monitored by the air pressure monitoring device, so as to maintain the internal air pressure of the sealed chamber consistent with that of the preheating furnace.

4. The preheating furnace air curtain sealing device according to claim 1, characterized in that: A conveyor belt is arranged inside the sealing chamber, and two ends of the conveyor belt are respectively connected to the feeding port of the sealing chamber and the feeding port.

5. The preheating furnace air curtain sealing device according to claim 4, characterized in that: The conveyor belt is a hollow mesh belt.

6. The preheating furnace air curtain sealing device according to claim 4, characterized in that: A plurality of material baskets are placed on the conveyor belt, and workpieces are placed inside the material baskets.

7. The preheating furnace air curtain sealing device according to claim 6, characterized in that: A metal sealing curtain is arranged inside the sealing chamber, the metal sealing curtain is connected to the top of the sealing chamber, and the metal sealing curtain is located between the air curtain and the inlet; when the material basket passes through the metal sealing curtain, the top of the material basket contacts the bottom of the metal sealing curtain.

8. The preheating furnace air curtain sealing device according to claim 1, characterized in that: A furnace door is arranged at the material inlet of the sealing chamber.

9. The preheating furnace air curtain sealing device according to claim 1, characterized in that: The sealed chamber is filled with inert gas.

Images