阅读说明：本技术 不锈钢圆钢穿孔前加热用步进底式加热炉 (Stepping bottom type heating furnace for heating stainless steel round steel before punching ) 是由 韩学军 汪波 汪涛 王洋 于 2021-07-29 设计创作，主要内容包括：本发明属于不锈钢穿孔技术领域,具体涉及一种不锈钢圆钢穿孔前加热用步进底式加热炉,包括步进底式加热炉,其特征在于：所述步进底式加热炉沿工件的行进方向依次为进料口、加热区和均热区,所述均热区的尾段设有出料槽,所述均热区尾段的底部为步进底运行预留空隙,所述步进底运行预留空隙处设有水封槽；所述步进底运行预留空隙正上方的炉顶设有一排炉顶烧嘴。本发明将步进底式加热炉应用到不锈钢无缝管生产线,实现加热设备自动化,减少人力资源投入。(The invention belongs to the technical field of stainless steel perforation, and particularly relates to a stepping bottom type heating furnace for heating stainless steel round steel before perforation, which comprises a stepping bottom type heating furnace and is characterized in that: the stepping bottom type heating furnace sequentially comprises a feeding hole, a heating area and a soaking area along the advancing direction of a workpiece, a discharging groove is arranged at the tail section of the soaking area, a stepping bottom operation reserved gap is arranged at the bottom of the tail section of the soaking area, and a water seal groove is arranged at the stepping bottom operation reserved gap; and a row of furnace top burners are arranged on the furnace top right above the reserved gap of the stepping bottom operation. The invention applies the stepping bottom type heating furnace to the stainless steel seamless tube production line, realizes the automation of heating equipment and reduces the input of human resources.)

1. The utility model provides a heating is with walking-beam bottom formula heating furnace before stainless steel round steel is perforated, includes walking-beam bottom formula heating furnace, its characterized in that: the stepping bottom type heating furnace is sequentially provided with a feeding hole, a heating area and a soaking area along the advancing direction of a workpiece (3), the tail section of the soaking area is provided with a discharging groove (4), the bottom of the tail section of the soaking area is a stepping bottom operation reserved gap (5), and a water seal groove (6) is arranged at the stepping bottom operation reserved gap (5); a row of furnace top burners (2) are arranged on the furnace top right above the stepping bottom operation reserved gap (5).

2. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 1, characterized in that: a discharge port is formed in one side wall of the stepping bottom type heating furnace, a material pushing port is formed in the other side wall of the stepping bottom type heating furnace, and the discharge port and the material pushing port are located at two ends of the discharge chute (4); the discharging device is characterized in that a steel tapping machine (7) is arranged outside the material pushing port, and the steel tapping machine (7) is used for penetrating the material pushing port to push the workpiece (3) out of the material discharging port along the material discharging groove (4).

3. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 2, characterized in that: the furnace walls at the left side and the right side of the heating area are provided with a plurality of side wall burners (1).

4. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 3, characterized in that: the side wall burners (1) on the furnace walls of the left side and the right side of the heating area are arranged in a staggered mode.

5. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 3, characterized in that: the furnace walls at the left side and the right side of the soaking zone are respectively provided with a plurality of side wall burners (1).

6. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 5, characterized in that: the side wall burners (1) on the furnace walls at the left side and the right side of the soaking zone are arranged in a staggered mode.

7. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 5, characterized in that: the furnace wall on both sides of the soaking zone is respectively provided with a temperature control thermocouple (8) and a monitoring thermocouple (9), the temperature control thermocouple (8) and the monitoring thermocouple (9) are both connected with an industrial personal computer, and the industrial personal computer is connected with the side wall burner (1) of the soaking zone.

8. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 7, characterized in that: the temperature control thermocouple (8) is positioned on one side of the discharge hole, and the monitoring thermocouple (9) is positioned on one side of the tapping machine (7).

9. The stepping bottom type heating furnace for heating before perforating stainless steel round steel according to claim 7, characterized in that: the elevations of the temperature control thermocouple (8) and the monitoring thermocouple (9) at the position away from the highest operation point of the workpiece (3) in the furnace are both 250 mm.

Technical Field

The invention belongs to the technical field of stainless steel perforation, and particularly relates to a stepping bottom type heating furnace for heating before stainless steel round steel perforation.

Background

The heating characteristic of stainless steel is that the heat conductivity coefficient is relatively small under the low temperature state, and the heat conductivity coefficient is gradually increased along with the increase of the temperature. The perforation temperature of the stainless steel round steel is about 1200 ℃, the heat conductivity coefficient at the temperature is far higher than that at normal temperature, and the heat conduction speed is much higher. Just this characteristic of stainless steel combines the structural feature of step furnace again, and the step furnace is applied to the stainless steel round steel and is heated before the perforation and to have certain technical difficulty, and the tube (stainless steel seamless steel pipe) that the step-by-step bottom formula heating furnace applied the stainless steel round steel and is heated before the perforation and wear out exists unfavorable conditions such as distortion and uneven wall thickness, so the stainless steel seamless pipe production mostly adopts traditional sloping bottom formula heating furnace at present.

Disclosure of Invention

The invention aims to provide a stepping bottom type heating furnace for heating before punching stainless steel round steel.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a heating is with walking-beam bottom formula heating furnace before stainless steel round steel is perforated, includes walking-beam bottom formula heating furnace, its characterized in that: the stepping bottom type heating furnace is sequentially provided with a feeding hole, a heating area and a soaking area along the advancing direction of a workpiece 3, the tail section of the soaking area is provided with a discharging groove 4, the bottom of the tail section of the soaking area is a stepping bottom operation reserved gap 5, and a water seal groove 6 is arranged at the stepping bottom operation reserved gap 5; a row of furnace top burners 2 are arranged on the furnace top right above the stepping bottom operation reserved gap 5.

Furthermore, a discharge port is formed in one side wall of the stepping bottom type heating furnace, a material pushing port is formed in the other side wall of the stepping bottom type heating furnace, and the discharge port and the material pushing port are located at two ends of the discharge chute 4; and a steel tapping machine 7 is arranged outside the material pushing opening, and the steel tapping machine 7 is used for penetrating through the material pushing opening to push the workpiece 3 out of the material discharging opening along the material discharging groove 4.

Furthermore, a plurality of side wall burners 1 are arranged on furnace walls on the left side and the right side of the heating area.

Further, the side wall burners 1 on the furnace walls on the left side and the right side of the heating area are arranged in a staggered mode.

Furthermore, a plurality of side wall burners 1 are arranged on the furnace walls on the left side and the right side of the soaking zone.

Further, the side wall burners 1 on the furnace walls at the left side and the right side of the soaking zone are arranged in a staggered mode.

Further, the furnace walls on the two sides of the soaking zone are respectively provided with a temperature control thermocouple 8 and a monitoring thermocouple 9, the temperature control thermocouple 8 and the monitoring thermocouple 9 are both connected with an industrial personal computer, and the industrial personal computer is connected with the side wall burner 1 of the soaking zone.

Further, the temperature control thermocouple 8 is positioned on one side of the discharge hole, and the monitoring thermocouple 9 is positioned on one side of the tapping machine 7.

Furthermore, the elevations of the temperature control thermocouple 8 and the monitoring thermocouple 9, which are far from the position of the highest operation point of the workpiece 3 in the furnace, are both 250 mm.

Compared with the prior art, the invention has the following beneficial effects: the invention improves the stepping bottom type heating furnace, applies the stepping bottom type heating furnace to a stainless steel seamless tube production line through temperature control adjustment, realizes the automation of heating equipment, replaces the traditional inclined bottom type heating furnace needing manual material shifting, realizes the automation of perforation heating equipment in the stainless steel field, and reduces the investment of human resources.

Drawings

FIG. 1 is a schematic side view of a walking-beam type heating furnace for heating round stainless steel before piercing.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

FIG. 3 is a schematic front view of a walking-beam type heating furnace for heating round stainless steel before piercing.

Fig. 4 is a schematic plan view of a walking-beam furnace (tail) for heating before piercing a stainless round steel rod.

In the figure, 1, a side wall burner; 2. a furnace top burner; 3. a workpiece (round steel); 4. a discharge chute; 5. a step bottom operation reserved gap; 6. water sealing the tank; 7. a tapping machine; 8. a temperature control thermocouple; 9. the thermocouples were monitored.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

To the defect that exists in the heating before the perforation of present step-by-step bottom heating furnace at the heating stainless steel round steel, this company is through the heating characteristic of the structure of studying step-by-step bottom heating furnace and stainless steel (the heating characteristic of stainless steel is coefficient of heat conductivity is less relatively under the low temperature state, and coefficient of heat conductivity can increase gradually along with the rising of temperature), and the main factor that has analyzed to lead to its defect is: step-by-step end formula heating furnace is equipped with water seal arrangement (being water seal groove 6) in the below of blown down tank 4, the water seal arrangement has been full of recirculated cooling water in, the water seal arrangement and the furnace space of this department are the intercommunication, under the effect of water seal arrangement steam, the furnace temperature at water seal arrangement top position is reduced, and the heat conduction speed of stainless steel under high temperature state is faster again, thereby lead to the stainless steel round steel that the heating is good to receive the influence of water seal arrangement at ejection of compact region and lead to great temperature drop, it is bigger on the large side to make stainless steel round steel core table difference in temperature, thereby lead to the seamless pipe of wearing out to have quality defects such as distortion and wall thickness are inhomogeneous.

Aiming at the problem analysis, the company modifies the existing stepping bottom type heating furnace into a stepping bottom type heating furnace for heating before punching stainless steel round steel, as shown in fig. 1, 2, 3 and 4, the stepping bottom type heating furnace sequentially comprises a feeding hole, a heating region and a soaking region along the advancing direction of a workpiece 3, the tail section of the soaking region is provided with a discharging groove 4, one side wall of the stepping bottom type heating furnace is provided with a discharging hole, the other side wall of the stepping bottom type heating furnace is provided with a material pushing hole, and the discharging hole and the material pushing hole are positioned at two ends of the discharging groove 4; and a steel tapping machine 7 is arranged outside the material pushing opening, and the steel tapping machine 7 is used for penetrating through the material pushing opening to push the workpiece 3 out of the material discharging opening along the material discharging groove 4. The bottom of the tail section of the soaking zone is a step bottom operation reserved gap 5 (the distance between the foremost position and the initial position of the step bottom operation, and the step bottom is also called as a step bottom), and a water seal groove 6 is arranged at the step bottom operation reserved gap 5. As shown in fig. 4, the furnace walls on the left and right sides of the heating zone and the soaking zone are respectively provided with a plurality of side wall burners 1, and the side wall burners 1 on the furnace walls on the two sides are arranged in a staggered manner. Two furnace top burners 2 are arranged on the furnace top right above the step bottom operation reserved gap 5.

In the conventional heating process of the traditional stepping bottom type heating furnace, each temperature-controlled burner is controlled by one temperature-controlled thermocouple in a centralized manner, namely, all the burners in the whole subarea are adjusted under the condition of high or low temperature. In response to this situation, the present invention further takes the following improvements: the furnace wall on the two sides of the soaking zone is respectively provided with a temperature control thermocouple 8 and a monitoring thermocouple 9, the temperature control thermocouple 8 is positioned on one side of the discharge hole, the monitoring thermocouple 9 is positioned on one side of the tapping machine 7, and the elevations of the temperature control thermocouple 8 and the monitoring thermocouple 9, which are away from the highest position of the operation of the workpiece 3 in the furnace, are both 250 mm. . The temperature control thermocouple 8 and the monitoring thermocouple 9 are both connected with an industrial personal computer, and the industrial personal computer is connected with the side wall burner 1 of the soaking zone. The industrial personal computer is mainly used for: displaying the temperature of the temperature control thermocouple 8 and the temperature of the monitoring thermocouple 9, comparing the temperature difference between the temperature control thermocouple 8 and the temperature difference between the monitoring thermocouple 9, and respectively and independently controlling the side wall burners 1 on the two sides of the soaking zone according to the temperature of the temperature control thermocouple 8 and the temperature difference.

The heating method before the improved heating furnace perforates the stainless steel round steel comprises the following steps:

s100, igniting the side wall burner 1 of the heating area, raising the furnace temperature of the heating area to 1200 ℃ of the perforation temperature of the round steel, closing the side wall burner 1 of the soaking area, and controlling the side wall burner 1 of the soaking area by a temperature control thermocouple 8.

S200, igniting the furnace top burner 2, and adjusting the flame size of the furnace top burner 2 until the temperature displayed by the temperature control thermocouple 8 is 50-60 ℃ lower than the perforation temperature, namely the displayed temperature is 1140-1150 ℃.

S300, adjusting the temperature of the soaking zone: igniting the side wall burner 1 of the soaking zone to enable the side wall burner to be in a big fire combustion state (the big fire combustion state is not less than 15 seconds), adjusting the big fire combustion size according to the temperature displayed by the temperature control thermocouple 8 until the temperature displayed by the temperature control thermocouple 8 is 1200 ℃, and locking the big fire combustion size.

S400, adjusting the uniformity of the temperature of the soaking zone: according to the temperature difference of the temperature control thermocouple 8 and the monitoring thermocouple 9, adjusting the flame size of the side wall burners 1 on the two sides of the soaking zone: when the temperature of the left side is high, the right side wall burner 1 is adjusted to be small; when the temperature of the left side is low, the right side wall burner 1 is enlarged; finally, the temperatures of the two thermocouples tend to be consistent, and the two thermocouples can be put into an automatic temperature control state.

S500, automatic temperature control state:

when the temperature of the temperature control thermocouple 8 and the temperature of the monitoring thermocouple 9 both reach the perforation temperature of 1200 ℃, the furnace top burner 2 is still in a combustion state, meanwhile, the side wall burner 1 of the soaking zone is switched to a small-fire combustion state, and the small-fire combustion is adjusted to be in a minimum state. At the moment, the temperature of the side wall burner 1 in a low-fire state and the temperature of the furnace top burner 2 in a normal combustion state are required to be not higher than the perforation temperature;

when the display temperature of the temperature-controlled thermocouple 8 is 3-5 deg.c lower than the piercing temperature, steps S300 and S400 are repeated.

Big fire and small fire are common technical terms in the field, and when the side wall burner 1 is of a single-tube structure, the small fire is when the valve opening is below 20%; when the side wall burner 1 is of a double-pipe structure, the flame of the main pipe is big fire, and the flame of the auxiliary pipe is small fire; the small fire is mainly used for igniting the big fire, and the big fire is used for heating and warming.

The principle and the effect of the scheme are as follows: the two furnace top burners 2 are always in a working state, so that the round steel in the furnace can be prevented from being cooled due to the generation of water vapor in the water seal tank 6, the temperature of the stainless steel round steel core can reach the same value, and the quality defects of distortion, uneven wall thickness and the like of a penetrated seamless pipe can be prevented. The temperature control of the soaking zone is realized by controlling the size of the side-wall burner 1 by the temperature control thermocouple 8 and controlling the switching combustion of the fire. The temperature difference conditions of the thermocouple 9 and the temperature control thermocouple 8 are monitored, the big-fire combustion size of the side wall burner 1 is adjusted, the convection heat transfer effect is enhanced, and the uniformity of the furnace temperature is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.