Automatic marshalling control method for large-specification high-quality special steel bars

Abstract

The invention relates to an automatic grouping control method for large-specification high-quality special steel bars, and belongs to the technical field of steel rolling finishing. The method comprises the specific steps that S1, the optimal multiple-length length is automatically calculated according to the total sawing amount of batch numbers and the number of single-time sawing branches, and high-temperature bars are sawn; s2, a monitoring signal is set at an inlet of the straightening plate, and stepping discharging and accurate counting are carried out according to a preset stepping tooth position and the discharging number of each tooth position; and S3, after the bar marshalling is formed, the bar marshalling is conveyed through an output roller way, a transition space is arranged between the output roller way and the straightening plate, and when it is monitored that the bar marshalling completely leaves the straightening plate and enters the transition space, the marshalling trolley is controlled to lift up the bar marshalling and transfer the bar marshalling to the output roller way. According to the automatic marshalling device, automation of the whole marshalling process after high-temperature sawing of the large-specification high-quality special steel is achieved, the production efficiency, the yield and the operation safety are effectively improved, and the problems that manual operation is low in efficiency, prone to making mistakes and poor in safety are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of finishing technology of steel rolling in the metallurgical industry, and in particular to a control method for automatic grouping and conveying of large-specification special steel bars after high-temperature sawing. BACKGROUND

[0002] After rolling, large-specification special steel bars (usually alloy structural steel, bearing steel, etc. with a diameter of Φ80mm or more) need to be cut to size online. Due to the large size of the bars and the high sawing temperature (usually required to be completed at >700℃ to prevent cracks and ensure sawing efficiency), high requirements are placed on the rapid collection, grouping and transportation of the bars after sawing.

[0003] In the prior art, manual intervention or semi-automatic methods are often used for grouping. The operator sets the sawing multiple-length according to experience and commands the grouping trolley and roller action through visual observation or simple sensor judgment. This method has the following significant disadvantages:

[0004] 1. Low efficiency: manual judgment and operation response is slow, which cannot meet the requirement of quickly moving out of the sawing area after high-temperature sawing, and is prone to form a production bottleneck.

[0005] 2. Poor accuracy and prone to errors: inaccurate multiple-length calculation leads to loss of yield; grouping count errors cause subsequent collection and bundling confusion.

[0006] 3. Low automation: the linkage between devices (sawing machine, straightening plate, output roller, grouping trolley) relies on manual instructions, has poor coordination, and there is a risk of device collision or bar falling.

[0007] 4. Poor safety: the environment in the grouping area of high-temperature bars is harsh, and manual close-range operation poses a safety hazard.

[0008] Therefore, there is an urgent need for a fully automatic, efficient, accurate and safe and reliable control method to achieve rapid and orderly grouping and conveying of large-specification special steel bars after high-temperature sawing. SUMMARY

[0009] The technical problem to be solved by the present application is to provide an automatic grouping control method for large-specification special steel bars, which can realize full-process automation from sawing multiple-length calculation to grouping output, significantly improving production efficiency, yield and job safety.

[0010] The technical solution adopted by the present application to solve the technical problem is: an automatic grouping control method for large-specification special steel bars, which adopts a system including a hot saw, an input roller, a straightening plate, a grouping trolley, an output roller and a plurality of monitoring sensors, and the method comprises the following steps:

[0011] S1: Automatic calculation of sawing length and sawing:

[0012] Receiving production batch number information issued by an upstream production management system, the batch number information including total sawing amount; automatically calculating optimal length of sawing this time according to the total sawing amount and preset sawing number per time; controlling a hot saw to cut the high-temperature bar to a fixed length according to the optimal length;

[0013] S2: Step-by-step feeding of straightening plate and counting:

[0014] The single-length bar after sawing is conveyed to the straightening plate through an input roller; a first monitoring sensor is arranged at the inlet end of the straightening plate to detect a bar arrival signal; the straightening plate is divided into multiple step-by-step teeth positions matched with the length of the bar; according to the production plan, the feeding number of each step-by-step tooth position is preset; after the first monitoring sensor detects the arrival of the bar, the straightening plate is controlled to step one tooth position, and the number of feeding is counted; the process is repeated until the feeding number of the current tooth position reaches the preset value;

[0015] S3: Grouping output and transition control:

[0016] When a complete bar grouping on the straightening plate is formed, the output roller is started; a second monitoring sensor is arranged at the inlet end of the output roller to monitor whether the grouped bar completely leaves the straightening plate; a transition space is arranged between the output roller and the straightening plate; when the second monitoring sensor detects that the end of the grouped bar has left the straightening plate and entered the transition space, the grouping trolley is controlled to rise, holds the bar grouping in the transition space, and moves to the output roller.

[0017] Preferably, in step S1, the calculation model of the optimal length also considers the cold shrinkage allowance of the bar and the length of the finished product.

[0018] Preferably, in step S2, the step-by-step action of the straightening plate is synchronously linked with the signal of the first monitoring sensor, ensuring that the straightening plate steps one tooth position for each bar.

[0019] Preferably, in step S3, the lifting action of the grouping trolley is synchronously linked with the signal of the second monitoring sensor, ensuring that the lifting action is only performed after the grouped bar completely leaves the straightening plate and enters the transition space, preventing interference or scratching between the straightening plate and the trolley.

[0020] The present application has the beneficial effect of solving the defects in the background art,

[0021] 1. Full-process automation: By integrating the data of the production management system, automatically calculating the sawing parameters, and controlling all equipment actions through sensor signal interlocking, manual intervention is greatly reduced, and "one-key" production is realized.

[0022] 2. High efficiency and high precision: The optimized double-length calculation model improves the yield; the step tooth position and counting control ensures the absolute accuracy of the grouping number; the fast automatic transfer meets the production rhythm of fast material removal after high-temperature sawing.

[0023] 3. High reliability and safety: By setting a transition space and precise sensor interlocking logic, equipment interference and collision between the grouping car and the straightening plate or bar are effectively avoided, the risk of bar falling is eliminated, and the operating personnel are isolated from the high-temperature area, improving the intrinsic safety level.

[0024] 4. Flexible production: By modifying the preset parameters (such as single sawing number, tooth position feeding number), it can quickly adapt to the production of different specifications and different batch numbers of bars, with strong versatility. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is the flowchart of the automatic grouping control method of the present application;

[0026] Fig. 2 is a top view schematic diagram of the system structure of the present application;

[0027] In the figure: 1 - hot saw, 2 - input roller, 3 - straightening plate, 4 - grouping car, 5 - output roller, 6 - first monitoring sensor, 7 - second monitoring sensor, 8 - transition space. DETAILED DESCRIPTION

[0028] The present application will now be further described in detail in conjunction with the drawings and preferred embodiments. These drawings are simplified schematic diagrams and only illustrate the basic structure of the present application in a schematic manner, so they only show the components related to the present application.

[0029] As shown in Figs. 1-2 , the system used in this embodiment mainly includes: hot saw 1, input roller 2, straightening plate 3, grouping car 4, output roller 5, first monitoring sensor 6 (located at the inlet end of the straightening plate 3), second monitoring sensor 7 (located at the inlet end of the output roller 5), and a central control system (not shown in the figure).

[0030] The specific control process is as follows:

[0031] The central control system receives a batch order from the MES (manufacturing execution system), for example, it needs to produce Φ150mm 42CrMo steel bars, the total sawing amount is 500 tons, and the final length is 12 meters.

[0032] S1: The system automatically calculates the optimal length of 48.5 meters (which takes into account the sawing loss and the cold shrinkage allowance) according to the total sawing amount, the single weight of the bar, and the preset process requirement of sawing 4 bars at a time. The hot saw 1 saws the high-temperature bar according to the 48.5-meter length, and obtains a single 48.5-meter-long bar.

[0033] S2: The sawed bar is transported to the straightening plate 3 by the input roller 2. When the head of the bar reaches the entrance of the straightening plate 3, the first monitoring sensor 6 (such as a photoelectric switch) sends a signal indicating that it is in place. After receiving the signal, the control system immediately drives the straightening plate 3 to step one tooth position (the length of each tooth position is slightly larger than the diameter of the bar). At the same time, the system accumulates the count of the number of bars in the tooth position. In this embodiment, it is set that 2 bars are stored in each tooth position. Therefore, when the first bar enters the first tooth position, the straightening plate 3 waits for the second bar. After the signal indicating that the second bar is in place is triggered, the straightening plate 3 steps again one tooth position, and at this time, the first tooth position has stored 2 bars. This cycle continues until a bar grouping consisting of multiple tooth positions and a total of 8 bars (4 sawing times x 2 bars / tooth position) is formed on the straightening plate 3.

[0034] S3: After the grouping is completed, the output roller 5 is started. The bar grouping is moved to the collection area under the drive of the output roller 5. When the end of the bar grouping leaves the straightening plate 3, the second monitoring sensor 7 detects the signal change. Because a transition space 8 is designed between the output roller 5 and the straightening plate 3, the grouping trolley 4 does not act immediately. Instead, when the second monitoring sensor 7 confirms that the entire grouping has completely left the straightening plate 3 and entered the transition space 8, the control system sends an instruction, and the grouping trolley 4 rises from below, stably holds the entire bar grouping, then moves laterally, and places it stably on the output roller 5, and finally transports it to the cooling bed or the collection rack.

[0035] The transition space 8 provides a safety margin for the lifting action of the grouping trolley 4, ensures that the bar grouping is completely separated from the straightening plate 3, and avoids any possible mechanical interference.

[0036] The above description is only a specific embodiment of the present application, and various examples do not limit the essential content of the present application. Those skilled in the art can modify or deform the previously described specific embodiments without departing from the essence and scope of the present application.

Claims

1. An automatic grouping control method for large-size special steel bars, comprising a system including a hot saw (1), an input roller conveyor (2), a straightening plate (3), a grouping trolley (4), and an output roller conveyor (5), characterized in that: The method includes the following steps: S1: Automatic calculation and sawing of multiple lengths: Receives production batch number information containing the total sawing quantity, automatically calculates the optimal multiple length for the current sawing based on the total sawing quantity and the preset number of pieces to be sawn at one time, and controls the hot saw (1) to saw the high-temperature bar at this length. S2: Straightening plate step feeding and counting: The sawn bars are conveyed to the straightening plate (3) via the input roller conveyor (2); a first monitoring sensor (6) is set at the entrance end of the straightening plate (3) to detect the arrival of the bars; the straightening plate (3) is divided into multiple stepping tooth positions, and a preset number of bars is set for each tooth position; when the first monitoring sensor (6) detects that the bars have arrived, the straightening plate (3) is controlled to step one tooth position and count the number of bars until the number of bars at the current tooth position reaches the preset value; S3: Grouping Output and Transition Control: When a complete bar group is formed on the straightening plate (3), the output roller conveyor (5) is started; a second monitoring sensor (7) is set at the entrance end of the output roller conveyor (5); a transition space (8) is provided between the output roller conveyor (5) and the straightening plate (3); when the second monitoring sensor (7) detects that the end of the grouped bar has left the straightening plate (3) and entered the transition space (8), the grouping trolley (4) is controlled to rise, and the bar group located in the transition space (8) is lifted and transferred to the output roller conveyor (5).

2. The automatic grouping control method for large-size special steel bars as described in claim 1, characterized in that: In step S1, the calculation of the optimal multiple length includes the shrinkage allowance of the bar and the finished length of the fixed length.

3. The automatic grouping control method for large-size special steel bars as described in claim 1, characterized in that: In step S2, the stepping motion of the straightening plate (3) is synchronized with the signal of the first monitoring sensor (6).

4. The automatic grouping control method for large-size special steel bars as described in claim 1, characterized in that: In step S3, the lifting action of the grouping trolley (4) is synchronized with the signal of the second monitoring sensor (7) to ensure that the bar grouping is completely separated from the straightening plate (3) before execution.

5. The automatic grouping control method for large-size special steel bars as described in claim 1, characterized in that: The length of the transition space (8) will not mechanically interfere with the straightening plate (3) when the grouping trolley (4) lifts the bar stock for grouping.

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