Heating furnace double-branch material distribution system and method

Abstract

The invention relates to the technical field of metallurgical equipment, in particular to a heating furnace double-branch material distribution system and method. According to the double-branch material distribution system and method for the heating furnace, an existing heating furnace is simple to transform and convenient to operate, two steel pipes can be arranged on the same tooth in the furnace through segmented design of the in-furnace out-furnace roller way and the out-furnace out-furnace roller way, and the production efficiency of the heating furnace is fully improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, and more specifically, to a double-branch material distribution system and method for a heating furnace. Background Art

[0002] Heat treatment is an essential process in the production process of steel pipes or bars. The heating furnace is an indispensable equipment for the heat treatment process. The steel pipes or bars are heat treated in the heating furnace according to a certain heating or cooling curve. The process is relatively slow. This process is one of the important factors restricting the output of steel pipes or bars. Therefore, how to improve the output of the heating furnace is a major problem that each steel plant needs to solve urgently.

[0003] To increase production, on the one hand, the number of heating furnaces can be increased, but the investment is relatively large; on the other hand, the existing heating furnaces can be modified to produce more steel without changing the existing structure. For example, a Chinese invention patent with application number 202410286292.3 discloses a method for distributing materials in a step-type slab heating furnace. For the multi-column distributing method of the step-type slab heating furnace, a staggered distributing method is proposed. Under the premise of not affecting the utilization rate of the heating furnace, the interval time of the slabs discharged from the furnace can be reduced by up to 57.7%, avoiding the phenomenon of subsequent rolling rhythm interruption due to too long interval time, and achieving the purpose of stabilizing the downstream rolling rhythm and increasing production. However, in the above-mentioned distributing method, at least two steel-out positions need to be set to ensure that the slabs in the heating furnace can be discharged stably. When modifying the existing equipment based on the above-mentioned distributing method, additional steel-out positions need to be added, which places high requirements on the site for the transformation of the heating furnace and requires additional on-site transformation. Summary of the invention

[0004] The purpose of the present invention is to provide a double-branch material distribution system and method for a heating furnace, which is simple to modify the existing heating furnace and easy to operate. By designing the roller table outside the furnace and the roller table inside the furnace for exiting the furnace in sections, two steel pipes can be arranged on the same tooth in the furnace, thereby fully improving the production efficiency of the heating furnace.

[0005] In order to achieve these purposes and other advantages according to the present invention, a double-branch material distribution system for a heating furnace is provided, comprising:

[0006] Walking beam heating furnace;

[0007] A loading unit, comprising an external furnace feeding roller and a loading mechanism arranged on one side of the external furnace feeding roller, wherein the external furnace feeding roller is connected to the internal furnace feeding roller of the heating furnace;

[0008] The discharging unit comprises an out-of-furnace roller conveyor and a discharging mechanism arranged on one side of the out-of-furnace roller conveyor. The out-of-furnace roller conveyor is connected to the in-furnace discharging roller conveyor of the heating furnace.

[0009] Furthermore, in the double-branch feeding system of a heating furnace, the feeding mechanism includes a feeding platform and a first feeding hook, the feeding platform is arranged on one side of the external furnace feeding roller conveyor, and the first feeding hook is arranged between the external furnace feeding roller conveyor and the feeding platform.

[0010] Furthermore, in the double-branch feeding system of a heating furnace, the discharging mechanism includes a discharging stand and a quenching machine, the discharging stand is arranged on one side of the furnace roller outside the furnace, the quenching machine is arranged between the discharging stand and the furnace roller outside the furnace, and a second material feeder hook is provided between the quenching machine and the furnace roller outside the furnace, and between the quenching machine and the discharging stand.

[0011] Furthermore, in the double-branch material distribution system of a heating furnace, the outer roller conveyor includes a first roller conveyor and a second roller conveyor connected end to end, the second roller conveyor is connected to the inner roller conveyor, the first roller conveyor and the second roller conveyor are respectively provided with a first detection switch and a second detection switch, and a boundary detection switch is also provided at the connection between the two.

[0012] Furthermore, in the double-branch material distribution system of the heating furnace, a furnace entry detection switch is provided at the furnace entry roller near the furnace entry door on the walking-beam heating furnace.

[0013] Furthermore, in the double-branch material distribution system of the heating furnace, a furnace exit detection switch is provided at the furnace exit roller outside the furnace close to the furnace exit door on the walking-beam heating furnace.

[0014] The present invention also provides a double-branch charging method for a heating furnace, which uses a first roller conveyor outside the furnace and a second roller conveyor outside the furnace connected in sequence, and steel materials are grouped in pairs during charging, including the following steps:

[0015] The feeding mechanism moves the previous steel to the first external roller conveyor. After the first detection switch on the first external roller conveyor detects the steel, the first external roller conveyor starts to work and drives the previous steel to move to the second external roller conveyor.

[0016] When the boundary detection switch at the connection between the first and second roller conveyors detects steel, the second roller conveyor starts to work and drives the previous steel to move toward the heating furnace;

[0017] When the boundary detection switch cannot detect steel, and the second detection switch on the second furnace outer roller conveyor detects steel, the first furnace outer roller conveyor and the second furnace outer roller conveyor stop working;

[0018] The feeding mechanism moves the last steel to the first furnace roller conveyor. After the first detection switch detects the steel, the first furnace roller conveyor starts to work and drives the previous steel to move to the second furnace roller conveyor. When the boundary detection switch detects the steel, the first furnace roller conveyor stops working.

[0019] The first and second rollers outside the furnace start to work at the same speed at the same time. After the two steels are successively fed into the heating furnace, the first and second rollers outside the furnace stop working.

[0020] The present invention also provides a double-branch charging method for a heating furnace, which uses a first roller conveyor outside the furnace and a second roller conveyor outside the furnace connected in sequence, and steel materials are grouped in pairs during charging, including the following steps:

[0021] The feeding mechanism moves the previous steel material to the second roller conveyor outside the furnace, and after the second detection switch on the second roller conveyor outside the furnace detects the steel material, the second roller conveyor outside the furnace starts to work and drives the previous steel material to move toward the first roller conveyor outside the furnace;

[0022] When the boundary detection switch at the connection between the first and second roller ways detects steel, the first roller way starts to work and drives the previous steel to move away from the second roller way;

[0023] When the boundary detection switch cannot detect steel, and the first detection switch on the first furnace outer roller conveyor detects steel, the first furnace outer roller conveyor and the second furnace outer roller conveyor stop working;

[0024] The feeding mechanism moves the last steel to the second roller conveyor outside the furnace. After the second detection switch detects the steel, the second roller conveyor outside the furnace starts to work and drives the previous steel to move toward the first roller conveyor outside the furnace. When the boundary detection switch detects the steel, the second roller conveyor outside the furnace stops working.

[0025] The first and second rollers outside the furnace start to work at the same speed at the same time. After the two steels are successively fed into the heating furnace, the first and second rollers outside the furnace stop working.

[0026] Furthermore, in the double-branch feeding method for a heating furnace, a furnace entry detection switch is provided on the furnace entry roller conveyor in the heating furnace near the furnace entry door of the heating furnace. When two steel bars are fed into the heating furnace, the furnace entry door is opened and the furnace entry detection switch can detect the steel bars. When the furnace entry detection switch cannot detect the steel bars, the furnace entry roller conveyor in the furnace, the first furnace entry roller conveyor outside the furnace and the second furnace entry roller conveyor outside the furnace stop working, and the furnace entry door is closed.

[0027] The present invention also provides a double-branch feeding method for a heating furnace, wherein a furnace discharge detection switch is provided on a furnace discharge roller outside the furnace near a furnace discharge door of the heating furnace, and when the furnace discharge roller inside the heating furnace transfers steel to a discharge unit, the method comprises the following steps:

[0028] The furnace door is opened, the rollers in the furnace start to work, and the steel is transferred to the rollers outside the furnace. After the furnace detection switch detects the steel, the rollers outside the furnace start to work and drive the steel to move toward the discharge mechanism.

[0029] When the furnace discharge detection switch fails to detect steel, the furnace discharge door is closed and the roller table in the furnace discharge stops working;

[0030] When the discharging mechanism moves the steel out of the out-furnace roller conveyor, the out-furnace roller conveyor stops working.

[0031] The beneficial effects of the present invention are:

[0032] 1. The double-branch material distribution system of the heating furnace of the present invention can be modified based on the existing heating furnace, the modification is simple and the operation is convenient. By designing the roller table outside the furnace and the roller table inside the furnace in sections, two steel pipes can be arranged on the same tooth in the furnace, which fully improves the production efficiency of the heating furnace.

[0033] 2. In the double-branch feeding method for a heating furnace of the present invention, based on the double-branch feeding system of the heating furnace, when the loading unit conveys steel to the walking-beam heating furnace, the first feeding hook of the loading mechanism can load the steel at two stations, the first roller conveyor outside the furnace or the second roller conveyor outside the furnace, and place the steel on the roller conveyor outside the furnace, which is convenient for on-site modification.

[0034] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the double-branch material distribution system of the heating furnace described in the present invention.

[0036] Wherein, the reference numerals represent:

[0037] 100, feeding unit; 110, feeding platform; 120, first material picking hook; 130, first detection switch; 140, boundary detection switch; 150, second detection switch; 160, first furnace roller conveyor for entering the furnace; 170, second furnace roller conveyor for entering the furnace;

[0038] 200, heating furnace; 210, furnace entry roller; 220, first furnace exit roller; 230, second furnace exit roller; 240, furnace entry door; 250, furnace exit door; 260, furnace entry detection switch;

[0039] 300, discharging unit; 310, furnace roller outside the furnace; 320, quenching machine; 330, discharging stand; 340, furnace discharging detection switch; 350, second material picking hook. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0041] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] like Figure 1 As shown, an embodiment of the present invention provides a double-branch material distribution system for a heating furnace, comprising:

[0043] Walking beam heating furnace 200;

[0044] The loading unit 100 includes an external furnace feeding roller and a loading mechanism arranged at one side of the external furnace feeding roller, wherein the external furnace feeding roller is connected to the internal furnace feeding roller of the heating furnace 200; specifically, the loading mechanism includes a loading platform 110 and a first material shifting hook 120, wherein the loading platform 110 is arranged at one side of the external furnace feeding roller, and the first material shifting hook 120 is arranged between the external furnace feeding roller and the loading platform 110;

[0045] The discharging unit 300 includes an out-of-furnace furnace roller conveyor 310 and a discharging mechanism arranged on one side of the out-of-furnace furnace roller conveyor 310, wherein the out-of-furnace furnace roller conveyor 310 is connected to the in-furnace furnace discharging roller conveyor of the heating furnace 200; the discharging mechanism includes a discharging platform 330 and a quenching machine 320, wherein the discharging platform 330 is arranged on one side of the out-of-furnace furnace roller conveyor 310, and the quenching machine 320 is arranged between the discharging platform 330 and the out-of-furnace furnace roller conveyor 310, and a second material picking hook 350 is provided between the quenching machine 320 and the out-of-furnace furnace roller conveyor 310, and between the quenching machine 320 and the discharging platform 330.

[0046] In this embodiment, the steel is mainly steel pipes or bars, which are placed on a loading stand 110 close to the side of the furnace inlet roller outside the furnace, and the first material selection hook 120 selects the steel pipes or bars on the loading stand 110 to the furnace outlet roller 310 outside the furnace. Each feeding step includes two steels. After the two steels are placed on the furnace outlet roller 310 outside the furnace, the feeding of the feeding step is completed, the furnace door 240 of the heating furnace 200 is opened, and the furnace outlet roller outside the furnace sends the two steels into the furnace inlet roller inside the heating furnace 200, and then the furnace door 240 of the heating furnace 200 is closed, and the two steels enter the heating furnace 200 for heating, and the walking beam inside the heating furnace 200 will move to the furnace outlet roller side at a certain speed according to the heating temperature curve of the steel. When the steel is heated in the heating furnace 200 and moved to the furnace discharge roller, the furnace door 250 of the heating furnace 200 is opened, the furnace discharge roller and the furnace discharge roller 310 start to work, and the steel is transferred to the furnace discharge roller 310. When the steel moves to the side of the quenching machine 320, the furnace discharge roller 310 stops working, and the second material transfer hook 350 between the quenching machine 320 and the furnace discharge roller 310 transfers the two steels on the furnace discharge roller 310 to the quenching machine 320 in turn for quenching. The quenching machine 320 can adopt a water quenching system.

[0047] Preferably, as another embodiment of the present invention, the outside-furnace entering-furnace roller conveyor comprises a first outside-furnace entering-furnace roller conveyor 160 and a second outside-furnace entering-furnace roller conveyor 170 connected end to end, the second outside-furnace entering-furnace roller conveyor 170 is connected to the inside-furnace entering-furnace roller conveyor, the first outside-furnace entering-furnace roller conveyor 160 and the second outside-furnace entering-furnace roller conveyor 170 are respectively provided with a first detection switch 130 and a second detection switch 150, and a boundary detection switch 140 is also provided at the connection between the two.

[0048] In this embodiment, when the loading unit 100 is conveying steel to the walking-beam heating furnace 200, the first material picking hook 120 of the loading mechanism can load the steel at two workstations, the first roller conveyor 160 outside the furnace or the second roller conveyor 170 outside the furnace, and place the steel on the roller conveyor outside the furnace, which is convenient for on-site modification.

[0049] Specifically, the feeding mechanism feeds the steel materials from the first external furnace roller conveyor 160 to the external furnace roller conveyor. The steel materials are grouped in pairs during feeding, and the steps include:

[0050] S1, the feeding mechanism moves the previous steel to the first external roller conveyor 160, and after the first detection switch 130 detects the steel, the first external roller conveyor 160 starts to work and drives the previous steel to move to the second external roller conveyor 170;

[0051] S2. When the boundary detection switch 140 detects steel, the second furnace roller 170 starts to work and drives the previous steel to move toward the walking beam heating furnace 200;

[0052] S3, when the boundary detection switch 140 cannot detect steel and the second detection switch 150 detects steel, the first external roller conveyor 160 and the second external roller conveyor 170 stop working;

[0053] S4, the feeding mechanism moves the next steel to the first external roller conveyor 160. After the first detection switch 130 detects the steel, the first external roller conveyor 160 starts to work and drives the previous steel to move to the second external roller conveyor 170. When the boundary detection switch 140 detects the steel, the first external roller conveyor 160 stops working.

[0054] S5, the first roller conveyor 160 and the second roller conveyor 170 start to work at the same speed at the same time. After two steels are successively fed into the walking beam heating furnace 200, the first roller conveyor 160 and the second roller conveyor 170 stop working.

[0055] Through the above steps S1-S5, the loading of two steel bars of a single group is completed, and when loading the next group of two steel bars, S1-S5 can be repeated.

[0056] When the feeding mechanism feeds the steel materials from the second external furnace roller conveyor 170 to the external furnace roller conveyor, the steel materials are grouped in pairs during the feeding process, including the following steps:

[0057] S1, the feeding mechanism moves the previous steel to the second external roller conveyor 170, and after the second detection switch 150 detects the steel, the second external roller conveyor 170 starts to work and drives the previous steel to move toward the first external roller conveyor 160;

[0058] S2. When the boundary detection switch 140 detects steel, the first external roller conveyor 160 starts to work and drives the previous steel to move away from the second external roller conveyor 170;

[0059] S3, when the boundary detection switch 140 cannot detect steel and the first detection switch 130 detects steel, the first external roller conveyor 160 and the second external roller conveyor 170 stop working;

[0060] S4, the feeding mechanism moves the last steel to the second external roller conveyor 170. After the second detection switch 150 detects the steel, the second external roller conveyor 170 starts to work and drives the previous steel to move toward the first external roller conveyor 160. When the boundary detection switch 140 detects the steel, the second external roller conveyor 170 stops working.

[0061] S5, the first and second rollers 160 and 170 start to work at the same speed at the same time, and after the two steels are sequentially fed into the walking beam heating furnace 200, the first and second rollers 160 and 170 stop working;

[0062] Through the above steps S1-S5, the loading of two steel bars of a single group is completed, and when loading the next group of two steel bars, S1-S5 can be repeated.

[0063] Preferably, as another embodiment of the present invention, the furnace entry roller is provided with a furnace entry detection switch 260 near the furnace entry door 240 on the walking-beam heating furnace 200. No matter the loading mechanism loads the materials from the first furnace entry roller 160 or the second furnace entry roller 170 to the furnace entry roller outside the furnace, when two steels are fed into the walking-beam heating furnace 200, the furnace entry door 240 is opened and the furnace entry detection switch 260 can detect the steels. When the furnace entry detection switch 260 cannot detect the steels, the furnace entry roller, the first furnace entry roller 160 and the second furnace entry roller 170 stop working, and the furnace entry door 240 is closed.

[0064] Preferably, as another embodiment of the present invention, the furnace outgoing roller conveyor 310 is provided with a furnace outgoing detection switch 340 near the furnace inlet door 250 on the walking beam heating furnace 200. When the furnace outgoing roller conveyor is opened to transfer the steel to the discharging unit 300, the following steps are included:

[0065] S1, the furnace door 250 is opened, the roller conveyor in the furnace starts to work, and the steel is transferred to the roller conveyor 310 outside the furnace. After the furnace detection switch 340 detects the steel, the roller conveyor 310 outside the furnace starts to work and drives the steel to move toward the discharge mechanism;

[0066] S2. When the furnace entry detection switch 260 cannot detect steel, the furnace entry door 250 is closed and the roller table in the furnace exiting the furnace stops working;

[0067] S3. After the discharging mechanism removes the steel from the out-furnace roller conveyor 310, the out-furnace roller conveyor 310 stops working.

[0068] Preferably, as another embodiment of the present invention, the roller conveyor in the furnace comprises a first roller conveyor 220 and a second roller conveyor 230 connected end to end. At this time, when the roller conveyor in the furnace is opened to transfer the steel to the discharging unit 300, the steel is loaded in pairs, including the following steps:

[0069] S1, the furnace door 250 is opened, the first furnace roller 220 and the second furnace roller 230 start to work, and the previous steel is transferred to the furnace roller 310 outside the furnace. After the furnace detection switch 340 detects the steel, the furnace roller 310 starts to work and drives the previous steel to move toward the discharge mechanism;

[0070] S2. When the furnace entry detection switch 260 cannot detect steel, the furnace entry door 250 is closed, and the first furnace exit roller 220 and the second furnace exit roller 230 stop working;

[0071] S3, when the discharging mechanism removes the previous steel from the out-of-furnace roller conveyor 310, the out-of-furnace roller conveyor 310 stops working;

[0072] S4, the furnace door 250 is opened, the second furnace roller 230 starts to work, and the last steel is transferred to the furnace roller 310 outside the furnace. After the furnace detection switch 340 detects the steel, the furnace roller 310 starts to work and drives the last steel to move toward the discharge mechanism;

[0073] S5. When the furnace entry detection switch 260 cannot detect the steel, the furnace entry door 250 is closed, and the first furnace exit roller 220 and the second furnace exit roller 230 stop working;

[0074] S6. After the discharging mechanism removes the last steel from the out-furnace roller conveyor 310, the out-furnace roller conveyor 310 stops working.

[0075] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A double-branch material distribution system for a heating furnace, characterized in that: include: Walking beam heating furnace; A loading unit, comprising an external furnace feeding roller and a loading mechanism arranged on one side of the external furnace feeding roller, wherein the external furnace feeding roller is connected to the internal furnace feeding roller of the heating furnace; The discharging unit comprises an out-of-furnace roller conveyor and a discharging mechanism arranged on one side of the out-of-furnace roller conveyor. The out-of-furnace roller conveyor is connected to the in-furnace discharging roller conveyor of the heating furnace.

2. A double-branch material distribution system for a heating furnace as claimed in claim 1, characterized in that: The feeding mechanism comprises a feeding platform and a first material shifting hook. The feeding platform is arranged at one side of the external furnace inlet roller conveyor, and the first material shifting hook is arranged between the external furnace inlet roller conveyor and the feeding platform.

3. A double-branch material distribution system for a heating furnace as claimed in claim 1, characterized in that: The discharging mechanism includes a discharging stand and a quenching machine. The discharging stand is arranged on one side of the furnace roller outside the furnace. The quenching machine is arranged between the discharging stand and the furnace roller outside the furnace. A second material picking hook is provided between the quenching machine and the furnace roller outside the furnace, and between the quenching machine and the discharging stand.

4. A double-branch material distribution system for a heating furnace as claimed in claim 1, characterized in that: The outer furnace entry roller conveyor comprises a first outer furnace entry roller conveyor and a second outer furnace entry roller conveyor connected end to end, the second outer furnace entry roller conveyor is connected to the inner furnace entry roller conveyor, the first outer furnace entry roller conveyor and the second outer furnace entry roller conveyor are respectively provided with a first detection switch and a second detection switch, and a boundary detection switch is also provided at the connection between the two.

5. A double-branch material distribution system for a heating furnace as claimed in claim 4, characterized in that: The furnace entry roller conveyor in the furnace is provided with a furnace entry detection switch near the furnace entry door on the walking beam heating furnace.

6. A double-branch material distribution system for a heating furnace as claimed in claim 4, characterized in that: The furnace exit roller is provided with a furnace exit detection switch near the furnace exit door on the walking beam heating furnace.

7. A double-branch material distribution method for a heating furnace, characterized in that: The first and second rollers connected in sequence are used, and the steel materials are loaded in pairs, including the following steps: The feeding mechanism moves the previous steel to the first external roller conveyor. After the first detection switch on the first external roller conveyor detects the steel, the first external roller conveyor starts to work and drives the previous steel to move to the second external roller conveyor. When the boundary detection switch at the connection between the first and second roller conveyors detects steel, the second roller conveyor starts to work and drives the previous steel to move toward the heating furnace; When the boundary detection switch cannot detect steel, and the second detection switch on the second furnace outer roller conveyor detects steel, the first furnace outer roller conveyor and the second furnace outer roller conveyor stop working; The feeding mechanism moves the last steel to the first furnace roller conveyor. After the first detection switch detects the steel, the first furnace roller conveyor starts to work and drives the previous steel to move to the second furnace roller conveyor. When the boundary detection switch detects the steel, the first furnace roller conveyor stops working. The first and second rollers outside the furnace start to work at the same speed at the same time. After the two steels are successively fed into the heating furnace, the first and second rollers outside the furnace stop working.

8. A double-branch material distribution method for a heating furnace, characterized in that: The first and second rollers connected in sequence are used, and the steel materials are loaded in pairs, including the following steps: The feeding mechanism moves the previous steel material to the second roller conveyor outside the furnace, and after the second detection switch on the second roller conveyor outside the furnace detects the steel material, the second roller conveyor outside the furnace starts to work and drives the previous steel material to move toward the first roller conveyor outside the furnace; When the boundary detection switch at the connection between the first and second roller ways detects steel, the first roller way starts to work and drives the previous steel to move away from the second roller way; When the boundary detection switch cannot detect steel, and the first detection switch on the first furnace outer roller conveyor detects steel, the first furnace outer roller conveyor and the second furnace outer roller conveyor stop working; The feeding mechanism moves the last steel to the second roller conveyor outside the furnace. After the second detection switch detects the steel, the second roller conveyor outside the furnace starts to work and drives the previous steel to move toward the first roller conveyor outside the furnace. When the boundary detection switch detects the steel, the second roller conveyor outside the furnace stops working. The first and second rollers outside the furnace start to work at the same speed at the same time. After the two steels are successively fed into the heating furnace, the first and second rollers outside the furnace stop working.

9. A double-branch material distribution method for a heating furnace as claimed in claim 8, characterized in that: An entry detection switch is provided on the furnace entry roller conveyor in the heating furnace near the furnace entry door of the heating furnace. When two steel bars are fed into the heating furnace, the furnace entry door is opened and the furnace entry detection switch can detect the steel bars. When the furnace entry detection switch cannot detect the steel bars, the furnace entry roller conveyor in the furnace, the first furnace entry roller conveyor outside the furnace and the second furnace entry roller conveyor outside the furnace stop working, and the furnace entry door is closed.

10. A double-branch material distribution method for a heating furnace, characterized in that: A furnace discharge detection switch is provided on the furnace discharge roller conveyor near the furnace discharge door of the heating furnace. When the furnace discharge roller conveyor of the heating furnace transfers the steel to the discharge unit, the following steps are included: The furnace door is opened, the rollers in the furnace start to work, and the steel is transferred to the rollers outside the furnace. After the furnace detection switch detects the steel, the rollers outside the furnace start to work and drive the steel to move toward the discharge mechanism. When the furnace discharge detection switch fails to detect steel, the furnace discharge door is closed and the roller table in the furnace discharge stops working; When the discharging mechanism moves the steel out of the out-furnace roller conveyor, the out-furnace roller conveyor stops working.

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