阅读说明：本技术 一种应用于加热炉狭窄空间的动态定位方法 (Dynamic positioning method applied to narrow space of heating furnace ) 是由 景婧 张勇利 任树朋 宋丙运 于 2021-06-07 设计创作，主要内容包括：一种应用于加热炉狭窄空间的动态定位方法,加热炉炉体装料侧南北两端各安装一台激光测距仪,当推钢机将料坯推至炉外装料辊道上,点击测长按钮,装料炉门自动打开,使料坯的两端刚好能被南、北两个激光测距仪照射到,通过南、北激光测距仪的测量值准确计算出料坯的实际长度,完成测长工序后炉外辊道启动,料坯开始自北向南入炉,在装炉过程中,南端激光测距仪的测量值实时动态跟踪料坯南端的行进距离,通过PLC程序计算判断炉体中心线与钢坯中心线的距离差值,根据这一差值进行两次辊道降速,最终钢坯中线准确停在炉体中心线处,实现料坯精准定位。本发明提高了步进式加热炉装钢准确性,减少了事故处理和设备维护的时间成本。(A dynamic positioning method applied to a narrow space of a heating furnace is characterized in that a laser range finder is respectively arranged at the north and south ends of the charging side of a furnace body of the heating furnace, when a steel pusher pushes a material blank to a charging roller way outside the furnace, a length measuring button is clicked, a charging furnace door is automatically opened, so that the two ends of the material blank can be just irradiated by the two laser range finders from the south to the north, the actual length of the material blank is accurately calculated through the measurement values of the two laser range finders, the outer roller way of the furnace is started after the length measuring process is completed, the material blank starts to enter the furnace from the north to the south, the moving distance of the south end of the material blank is dynamically tracked in real time through the measurement values of the south end laser range finders in the charging process, the distance difference between the center line of the furnace body and the center line of the steel blank is calculated and judged through a PLC program, the roller way is decelerated twice according to the difference, and finally the center line of the steel blank is accurately stopped at the center line of the furnace body, and the accurate positioning of the material blank is realized. The invention improves the steel loading accuracy of the walking beam furnace and reduces the time cost of accident treatment and equipment maintenance.)

1. A dynamic positioning method applied to a narrow space of a heating furnace is characterized in that a laser range finder is respectively arranged at the south and north ends of the charging side of a heating furnace body, the north end laser range finder is arranged at the north end of a charging external roller way, the south end laser range finder is arranged on the south wall of the furnace body, a hole is formed in the south wall of the heating furnace body, the laser of the laser range finder penetrates through the heating furnace body to irradiate the upper part of a track in the furnace, when a pusher pushes a blank to the external charging roller way, a length measuring button is clicked, a charging furnace door is automatically opened, the two ends of the blank can be just irradiated by the south and north laser range finders, the actual length of the blank is accurately calculated through the measurement values of the south and north laser range finders, the external roller way is started after a length measuring process is completed, the blank starts to enter the furnace from the north to the south, the moving distance of the blank at the south end is dynamically tracked in real time by the measurement value of the south end laser range finder, the distance difference between the central line of the furnace body and the central line of the billet is continuously calculated and judged through a PLC program, the roller way is decelerated twice according to the difference, and finally the central line of the billet is accurately stopped at the central line of the furnace body, so that the material is uniformly placed on 2 static beams, and the precise positioning of the material blank is realized.

Technical Field

The invention relates to a rod and wire rolling and heating process, which is applied to the charging of a stepping heating furnace and is also suitable for the field with limited site and higher requirements on dynamic positioning accuracy.

Background

When the walking beam furnace is used in a rod and wire production line, a side-feeding steel loading mode is generally adopted, namely, raw materials are transported outside the furnace through a furnace-outside loading roller way, enter the furnace from a furnace door arranged on a side wall, are transported to a proper position through a furnace-inside cantilever roller way, are stopped, and a steel billet on the cantilever roller way is placed on a beam by means of a circulating action before the walking beam.

Generally, at least three static beams and two moving beams are arranged in a stepping heating furnace, a translation frame of each moving beam is supported by two rows of steel wheels to complete the up-down, left-right and up-down actions, so that when the moving beam supports blanks on a cantilever roller way to move forwards to a static beam orbital transfer position, at least two static beams can support the blanks no matter how large the deviation exists, and the blanks cannot fall off the way. In addition, if a large amount of steel billets are installed towards the same side in an inclined mode, the situation that the frame is inclined towards the side with the inclined mode continuously due to aggravation when the center of gravity of the frame deviates can be avoided due to the fact that the moving beam translation frame is supported by double rows of rails. Therefore, the requirement of the conventional side-mounted steel heating furnace on the accuracy of billet feeding positioning is not high.

The stainless steel wire factory walking beam heating furnace is limited by the site, only two static beams are arranged in the furnace, the widest position of the rail changing position of the soaking section is 2.75m, the length of the shortest raw material is 3.15m, and the average distance from the end part of the billet to the static beams is only 0.2m, so that the centering and positioning accuracy of the billet is required to be controlled within 0.15 m. The total number of the billet steel advancing from the furnace tail to the furnace mouth is 100, and if the deviation of each step is 2mm, a derailment accident inevitably occurs at the position of the track change. In addition, the movable beam frame is not supported by double-row rails due to space limitation, the double-row rails at the front end and the rear end of the frame are adopted, the middle single rail is arranged, once a large amount of materials are installed in a biased mode, the translation frame is inevitably subjected to torsional deformation, and then billet steel continuously deviates to the side where the materials are installed in a biased mode in the process of travelling.

The charging of the steel billet needs to be completed in two steps: measuring length outside the furnace and positioning in the furnace. The control process is as follows: the length measurement of the material blank is realized by utilizing a photoelectric switch and an encoder arranged on a motor shaft head in the advancing process of the material blank outside the furnace, and after the head enters the furnace, the centering and positioning in the furnace are completed by the encoder of the roller way in the furnace according to the advancing distance of the material blank, namely, the alignment of the central line of the furnace body and the central line of the material blank is realized. The length measurement and positioning mode of the encoder requires that the billet has a sufficiently long travelling distance, so that the measurement and calculation interval of the encoder is positioned at the uniform-speed advancing stage of the billet, namely the billet and the roller way move synchronously, and the relative movement stage between the billet and the roller way during acceleration is avoided, and relatively accurate data is obtained.

Because the distance for the billet to travel is less than 0.4 m and the billet is completely in the billet acceleration stage, the surface roughness and the friction coefficient of different steel grades are different, and the relative movement degrees of the billet and the roller way are different, the maximum measurement length error of the billet outside the furnace can reach 3 m, the centering and positioning of the billet in the furnace is directly influenced, the maximum centering and positioning error in the debugging reaches 0.5mm, and even the billet directly touches the anti-loading device to stop. If steel is loaded in the existing centering control mode, lateral deviation can be generated inevitably to damage a side furnace wall and a material blank falls off a channel, so that serious production accidents of forced furnace shutdown and steel taking are caused.

Disclosure of Invention

In order to improve the accuracy of the centering and positioning of the charging of the stepping heating furnace, eliminate the accident of steel billet derailment caused by large centering deviation and ensure the safe and stable operation of a heating furnace body, the invention provides a dynamic positioning method applied to the narrow space of the heating furnace.

The technical scheme of the invention is as follows: a dynamic positioning method applied to a narrow space of a heating furnace is characterized in that a laser range finder is respectively arranged at the south and north ends of the charging side of a heating furnace body, the north end laser range finder is arranged at the north end of a charging external roller way, the south end laser range finder is arranged on the south wall of the furnace body, a hole is formed in the south wall of the heating furnace body, the laser of the laser range finder penetrates through the heating furnace body to irradiate the upper part of a track in the furnace, when a pusher pushes a blank to the external charging roller way, a length measuring button is clicked, a charging furnace door is automatically opened, the two ends of the blank can be just irradiated by the south and north laser range finders, the actual length of the blank is accurately calculated through the measurement values of the south and north laser range finders, the external roller way is started after a length measuring process is completed, the blank starts to enter the furnace from the north to the south, the moving distance of the blank at the south end is dynamically tracked in real time by the measurement value of the south end laser range finder, the distance difference between the central line of the furnace body and the central line of the billet is continuously calculated and judged through a PLC program, the roller way is decelerated twice according to the difference, and finally the central line of the billet is accurately stopped at the central line of the furnace body, so that the material is uniformly placed on 2 static beams, and the precise positioning of the material blank is realized.

The laser range finder adopts non-contact laser range finder, gathers south, north measured value to PLC control system, calculates, the control procedure of rectifying through PLC control system, realizes the accurate location of material base.

The dynamic positioning system provided by the invention has the advantages that the positioning error in the billet furnace is less than or equal to 25mm, the requirement of accurate positioning in the charging process is completely met, the production accidents that the side wall is damaged by the transverse deviation of the billet and the billet falls off the way are avoided, the normal operation of the furnace body is ensured, the time for fault treatment and equipment maintenance is saved, and the obvious benefit is created for enterprises.

Drawings

Fig. 1 is a part of the software flow chart of the present invention (which is split into two pictures because the pictures are large and cannot be embodied in one picture).

FIG. 2 is another partial software flow diagram of the present invention.

Detailed Description

The dynamic positioning method applied to the narrow space of the heating furnace is characterized in that a laser range finder is respectively arranged at the south and north ends of the charging side of the heating furnace body, the north laser range finder is arranged at the north end of a roller way outside the charging furnace, the south laser range finder is arranged on the south wall of the furnace body, a hole is formed in the south wall of the heating furnace body, the laser of the laser range finder penetrates through the heating furnace body to irradiate the upper part of a track in the heating furnace, when a pusher pushes a billet to the roller way outside the charging furnace, a length measuring button is clicked, a charging furnace door is automatically opened by a system, the two ends of the billet can be irradiated by the south laser range finder and the north laser range finder, the actual length of the billet can be accurately calculated through the measurement values of the south laser range finder and the north laser range finder, and the error is ensured to be within 10 mm. After the length measuring process is completed, the external roller way is started, the material blank starts to enter the furnace from north to south, in the charging process, the measured value of the south laser distance meter dynamically tracks the advancing distance of the south end of the material blank in real time, the distance difference between the central line of the furnace body and the central line of the steel blank is continuously calculated and judged through a PLC program, the speed of the roller way is reduced twice according to the difference, and finally the central line of the steel blank is accurately stopped at the central line of the furnace body, so that the material is uniformly placed on 2 static beams, and the accurate positioning of the material blank is realized.