Automatic steel charging control method for heating furnace

Abstract

The invention discloses an automatic steel charging control method for a heating furnace, which comprises the following steps of: judging whether the inside of a charging side furnace is in an idle state or not through calculation in the furnace; under the condition that no material exists on the charging roller way, the position of the plate blank in the furnace is obtained; under the condition that materials exist on the charging roller way, the position of the plate blank in the furnace is obtained; the distance between the two loaded plate blanks is set; when the furnace is empty, the minimum range is set; when the furnace is not empty, the maximum range is set; a selection function is added on a Wincc picture, and the layout of the plate blank in the furnace is adjusted; the numerical value of an encoder for advancing of the steel charging machine is calibrated, so that the actual advancing distance is consistent with the numerical value displayed by the encoder, and a soft signal and a hard limit during automatic steel charging are determined; the steel charging stroke is calculated, and the set distance between the two charged plate blanks is reduced; adjusting the position and signal of a field detection component; and an automatic steel loading button is clicked on the Wincc picture to carry out an automatic steel loading process. According to the invention, the accuracy and reliability of automatic steel loading are improved, and the efficiency is improved, so that the benefit is increased.

Description

Technical Field

[0001] The invention relates to the technical field of automatic steel loading control, and in particular to an automatic steel loading control method for a heating furnace. Background Art

[0002] At present, the heating furnace of the hot rolling 1700 production line is automatically loaded with steel during normal production. Only 19 1500mm slabs can be loaded, while 22-23 slabs can be loaded according to the standard furnace, affecting the production capacity of the workshop; during the automatic steel loading process, the automatic positioning error of the slab is large, resulting in a large gap between the steel loading positions in the furnace; the automatically loaded slabs will overlap, causing the slabs to hit the circulating water pipe of the stepping beam, posing a hidden danger to the operation of the equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a method for controlling automatic steel loading of a heating furnace, which can realize automatic steel loading and improve production efficiency by optimizing the program of the defects in the control of the on-site equipment of the steel loading machine.

[0004] The present invention adopts the following technical solution:

[0005] A heating furnace automatic steel loading control method comprises the following steps:

[0006] S1. Add the widths of the slabs loaded into the walking beam to obtain the actual position of the slabs in the furnace, and determine whether the furnace on the charging side is in an idle state based on the position.

[0007] S2. When there is no material on the loading roller, the maximum allowable slab width of 1550mm is used as a reference, and the slab position in the furnace is obtained by the rising and translation values ​​of the walking beam.

[0008] S3. When there is material on the loading roller, the slab width of the actual material tracking is used as a reference, and the slab position in the furnace is obtained by the rising and translation values ​​of the walking beam.

[0009] S4. Set the distance between two slabs to be loaded; when the furnace is empty, set the minimum range; when the furnace is not empty, set the maximum range.

[0010] S5. Add selection function on Wincc screen to adjust the layout of slab in furnace.

[0011] S6. Calibrate the encoder value of the steel loader so that the actual forward distance is consistent with the encoder display value, and determine the soft signal and hard limit during automatic steel loading.

[0012] S7, calculating the steel loading stroke, and reducing the distance between the two slabs set in step S4.

[0013] S8. Adjust the position and signal of on-site detection components.

[0014] S9. Click the automatic steel loading button on the Wincc screen to start the automatic steel loading process.

[0015] Furthermore, in step S1, when the detected value in the furnace is the maximum width of the 1550mm slab + 60mm, it is in an idle state, and this position is set as the starting position for charging.

[0016] Furthermore, in step S2, the maximum slab width in the furnace is controlled to be 1550 mm + 600 mm interval.

[0017] Furthermore, in step S3, the maximum slab width in the furnace is controlled to be 1550 mm + 600 mm interval.

[0018] Furthermore, in step S6, the specific content of the calibration is:

[0019] Take the steel loader's wheel as the reference datum 0 point, and use a tape measure to measure whether the distance the steel loader has moved forward is consistent with the value displayed on the encoder. If not, modify the corresponding coefficient until the values ​​are consistent.

[0020] Furthermore, in step S6, the adjustment range of the hard limit is 10-20 mm.

[0021] Furthermore, in step S7, the steel loading stroke is calculated using the motor travel encoder, and when the furnace is idle, the steel loading machine will automatically set the forward stroke, with the maximum setting not exceeding 4400 mm.

[0022] Furthermore, in step S8, the material tracking signal of the loading slab is restored, and the photoelectric tube signal is sent to the transmitting board. When the signal is in red state, it indicates that the data transmission process is normal; and the automatic step detection components of the stepping beam are adjusted, and the value of the displacement sensor is set so that the operating error range is ±10, and the proximity switch is adjusted to a normally lighted state.

[0023] Further, in step S9, the automatic steel loading process includes, in sequence, automatic rising of the furnace door, rising of the furnace door into position, straightening of the steel loader, rising of the steel loader into position, forward movement of the steel loader, lowering of the steel loader, retreat of the steel loader into position and lowering of the furnace door into position.

[0024] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0025] The method proposed in the present invention improves the automatic steel loading, avoids the human error caused by manual steel loading through automatic control, and increases additional production benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the automatic steel loading positioning model of the heating furnace improved by the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0028] To achieve the above purpose, the present invention proposes a heating furnace automatic steel charging control method, combined with the heating furnace automatic steel charging control system of the 1700 hot rolling production line, and improves the heating furnace steel charging control program Siemens Step7 FC910. The specific steps are as follows:

[0029] S1. Add the width of the slab loaded in the walking beam to obtain the actual position of the slab in the furnace, and judge whether the furnace on the charging side is in an idle state based on the position; when the detection value in the furnace is the maximum width of the slab of 1550mm + 60mm, it is in an idle state, and this position is set as the starting position for charging.

[0030] S2. When there is no material on the loading roller, the maximum allowable slab width of 1550mm is used as a reference, and the slab position in the furnace is obtained by the rising and translation values ​​of the walking beam; the maximum slab width in the furnace is controlled to be 1550mm + interval 600mm (charging starting line).

[0031] S3. When there is material on the loading roller, the slab width of the actual material tracking is used as the reference, and the slab position in the furnace is obtained by the rising and translation values ​​of the stepping beam; the maximum slab width in the furnace is controlled to be 1550mm + interval 600mm (charging starting line).

[0032] S4. Set the distance between two slabs to 150mm. When the furnace is empty, the minimum range is set to 3800mm. When the furnace is not empty, the maximum range is set to 4300mm.

[0033] S5. Add selection function on Wincc screen to adjust the layout of slab in furnace.

[0034] S6. When changing the steel type during the steel loading process, the automatic steel loading slabs will overlap, causing the slabs to hit the circulating water pipe of the walking beam, which will bring hidden dangers to the operation of the equipment. In order to avoid similar problems, the following measures are taken:

[0035] (1) Calibrate the encoder value of the steel loader's advance, take the steel loader's wheel as the reference datum 0 point, and use a tape measure to measure whether the distance the steel loader advances is consistent with the value displayed on the encoder. If not, modify the corresponding coefficient until the value is consistent, so that the actual advance distance is consistent with the encoder display value, and ensure the accuracy of the soft signal and hard limit during automatic steel loading. The adjustment range of the hard limit is 10-20mm.

[0036] (2) Calculate the steel loading stroke and reduce the distance between the two slabs to be loaded; the specific contents are as follows:

[0037] The motor travel encoder is used to calculate the steel loading stroke. When the furnace is idle, the automatic steel loading conditions are met and the steel loader will automatically set the forward stroke. The maximum setting does not exceed 4400mm, which is the distance value of the idle position in the furnace. In order to save space for storing slabs in the furnace, the distance between the two slabs loaded in step S4 is changed to 100mm.

[0038] (3) Modify the position between the models in the furnace and add an adjustment window on the host computer. The operator only needs to click on the host computer screen to move the slab position forward 100 mm to shorten the error and ensure normal automatic steel loading.

[0039] S7. Re-adjust the position and signal of the on-site detection components. The specific contents are as follows:

[0040] Restore the material tracking signal of the loading slab and send the photoelectric tube signal to the transmitting board. When the signal is in red state, it indicates that the data transmission process is normal. Adjust the automatic step detection components of the stepping beam, set the value of the displacement sensor, so that the operating error range is ±10, and adjust the proximity switch to a normally bright state. This position is the normal effective control range.

[0041] S8. Click the automatic steel loading button on the Wincc screen to start the automatic steel loading process, which includes the automatic rising of the furnace door, the rising of the furnace door into position, the straightening of the steel loader, the rising of the steel loader into position, the forward movement of the steel loader, the lowering of the steel loader, the retreat of the steel loader and the lowering of the furnace door into position.

[0042] The improved steel loading control procedure is:

[0043]

[0044]

[0045]

[0046] Figure 1 This is the improved automatic steel loading positioning model of the heating furnace. The gray part is the furnace wall, the blue part is the slab, the number on each slab is the coil number, and the gap between the furnace wall and the slab is the gap in the furnace. After the improvement, the original 1500mm slab in the furnace can hold 19 pieces, but now it can hold 21 pieces. According to normal production, one shift can hold 3 more pieces, 9 more pieces a day, 270 pieces a month, and one ton is calculated as a profit of 200 yuan, so the benefits created in one month are: 270 (pieces) * 25 (tons) * 200 (yuan) = 1.35 million (yuan).

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heating furnace automatic steel loading control method, characterized in that: include: S1. Add the widths of the slabs loaded into the walking beam to obtain the actual position of the slabs in the furnace, and determine whether the furnace on the charging side is in an idle state based on the position; S2. When there is no material on the loading roller, the maximum allowable slab width of 1550mm is used as the reference, and the slab position in the furnace is obtained by the ascending and translating values ​​of the walking beam; S3. When there is material on the loading roller, the slab width of the actual material tracking is used as a reference, and the slab position in the furnace is obtained by the ascending and translating values ​​of the walking beam; S4, set the distance between two slabs for loading; when the furnace is empty, set the minimum range; when the furnace is not empty, set the maximum range; S5. Add selection function on Wincc screen to adjust the layout of slab in furnace; S6. Calibrate the encoder value of the steel loader so that the actual forward distance is consistent with the encoder display value, and determine the soft signal and hard limit during automatic steel loading; S7, calculating the steel loading stroke, and reducing the distance between two slabs for loading set in step S4; S8. Adjust the position and signal of on-site detection components; S9. Click the automatic steel loading button on the Wincc screen to start the automatic steel loading process.

2. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S1, when the detected value in the furnace is the maximum width of the 1550mm slab + 60mm, it is in an idle state, and this position is set as the starting position for loading.

3. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S2, the maximum slab width in the furnace is controlled to be 1550 mm + 600 mm interval.

4. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S3, the maximum slab width in the furnace is controlled to be 1550 mm + 600 mm interval.

5. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S6, the specific content of the calibration is: Take the steel loader's wheel as the reference datum 0 point, and use a tape measure to measure whether the distance the steel loader has moved forward is consistent with the value displayed on the encoder. If not, modify the corresponding coefficient until the values ​​are consistent.

6. The automatic steel loading control method for a heating furnace according to claim 1, characterized in that: In step S6, the adjustment range of the hard limit is 10-20 mm.

7. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S7, the motor travel encoder is used to calculate the steel loading stroke. When the furnace is idle, the steel loading machine will automatically set the forward stroke, and the maximum setting does not exceed 4400mm.

8. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S8, the material tracking signal of the loading slab is restored, and the photoelectric tube signal is sent to the transmitting board. When the signal is in red state, it indicates that the data transmission process is normal; and the automatic step detection components of the stepping beam are adjusted, and the value of the displacement sensor is set so that the operating error range is ±10, and the proximity switch is adjusted to a normally bright state.

9. The automatic steel charging control method for a heating furnace according to claim 1, characterized in that: In step S9, the automatic steel loading process includes, in sequence, the automatic rising of the furnace door, the rising of the furnace door into position, the straightening of the steel loader, the rising of the steel loader into position, the forward movement of the steel loader, the lowering of the steel loader, the retreat of the steel loader into position and the lowering of the furnace door into position.

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