Rapid sizing and accurate shearing system of hydraulic shear and use method of rapid sizing and accurate shearing system

Abstract

The invention relates to a rapid sizing and accurate shearing system of a hydraulic shear. The system is characterized in that a shearing station is arranged in a transportation assembly; the shearing assembly comprises a hydraulic shear driving device, a lower tool apron and an upper tool apron, the hydraulic shear driving assembly is located in the shearing station and located below the shearing station, a shear blade is formed when the upper tool apron makes contact with the lower tool apron, the lower tool apron is arranged on the hydraulic shear driving device, the upper tool apron is located above the lower tool apron, and the upper tool apron is located above the shearing station. A movable sensor is arranged on the side of the lower tool apron; the detection assembly comprises a neutral position sensor, a laser velocimeter and a laser metal detector, the neutral position sensor is arranged on the outer side of the hydraulic shear driving device, the laser metal detector is arranged above the shear blade position, and the laser velocimeter is arranged above the side, close to the before-shear roller bed unit, of the upper tool apron. According to the invention, the fixed-length shearing function of automatically removing the head cutting blank and automatically measuring the length of the steel billet is realized, and the fixed-length efficiency of the hydraulic shear is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of metal smelting technology, and more specifically, to a system and method for rapid length setting and precise cutting using hydraulic shears. Background Technology

[0002] Hydraulic shears are important production equipment used for shearing the head of rolled products and cutting them to length on rolling production lines. The ability to shear quickly and accurately is an important factor affecting economic and technical indicators such as rolling production efficiency, product quality, and yield.

[0003] In the bar rolling process, after the continuously cast billet is rolled into a square billet by the billet mill, defects such as tongue-shaped and fish-tail-shaped ends often appear on the billet's head. Simultaneously, during the transport of the billet via the roller conveyor, the temperature of the billet's head is often lower due to the influence of air and cooling water. Therefore, according to process requirements, after rolling in the billet mill, the head of the continuously cast billet must be cut off by a hydraulic shear located before the continuous rolling mill, ensuring the quality of the finished product and the stability of the process. However, after the hydraulic shear cuts the billet's head, the cut billet often remains on the lower blade holder of the hydraulic shear, preventing it from passing through the hydraulic shear channel into the continuous rolling mill, severely affecting the rolling process rhythm. Therefore, manufacturing companies can only assign dedicated personnel to manually hook the cut billet head out of the cutter holder using hooks, and then let the billet enter the continuous rolling process through hydraulic shears. However, this manual method of removing the billet head is often affected by factors such as the worker's work experience, sense of responsibility, and mood during work, which may pose safety hazards. In addition, the production pace is slow, and it also greatly wastes the company's human resources.

[0004] According to production process requirements, billets need to be made into fixed-length products of different dimensions. However, the existing hydraulic shears operate by directly moving to the highest limit during shearing and returning to the lowest limit afterward. This means that, from setting the length to cutting, and considering the entire process from shearing to delivery, each cut takes approximately 20 seconds under normal conditions, resulting in a long shearing time. Furthermore, the original design of the fixed-length shearing system used either a fixed-block lifting baffle or a mobile fixed-length machine to determine the billet length. A fixed-block lifting baffle can only cut one length specification, which cannot meet production needs. While a mobile fixed-length machine can theoretically cut multiple lengths, the speed of the billet during transport cannot match the speed of the roller conveyor, causing the billet to slide on the roller conveyor. The inevitable impact and collision between the billet and the fixed-length machine leads to relative displacement, resulting in a significant error between the set length and the customer's required length. Typically, after the billet is cut, personnel need to recheck the fixed length and redesign the roller conveyor speed. This method of manually checking billet length data increases the labor intensity of workers and poses safety hazards. Furthermore, it significantly impacts production rhythm, directly affecting the overall production line's capacity. Therefore, achieving rapid billet head removal and accurate length-based cutting using hydraulic shears has become an urgent technical problem to be solved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a system and method for rapid and precise cutting of hydraulic shears, which realizes the functions of automatically removing cut-off blanks and automatically measuring the length of steel billets for cutting to length, thus greatly improving the efficiency of hydraulic shears for cutting to length.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A system for rapid and precise cutting with hydraulic shears includes a controller and a shearing assembly, a transport assembly, and a detection assembly connected to the controller; A shearing station is set up inside the transport component; The shearing assembly includes a hydraulic shear drive unit, a lower blade holder, and an upper blade holder. The hydraulic shear drive unit is located within the shearing station and below the shearing station. When the upper blade holder contacts the lower blade holder, a shear blade is formed. The lower blade holder is mounted on the hydraulic shear drive unit, and the upper blade holder is located above the lower blade holder and above the shearing station. A motion sensor is mounted on the side of the lower blade holder. The detection components include a center position sensor, a laser velocimeter, and a laser metal detector. The center position sensor is located outside the hydraulic shear drive unit. When the lower blade holder moves to the center position, the center position sensor detects the movement. The laser metal detector is located above the shear blade position, and the laser velocimeter is located above the upper blade holder on the side near the front roller conveyor unit.

[0007] In one embodiment, the detection component further includes a high-position sensor and a low-position sensor, both of which are disposed outside the hydraulic shear drive device. The high-position sensor is disposed above the middle-position sensor, and when the lower cutter head moves to the high position, the high-position sensor detects the movement sensor. The low-position sensor is disposed below the middle-position sensor, and when the lower cutter head moves to the low position, the low-position sensor detects the movement sensor.

[0008] In one embodiment, the transport assembly includes a pre-shear roller conveyor and a post-shear roller conveyor, with a shearing station formed between the pre-shear roller conveyor and the post-shear roller conveyor. The shearing roller conveyor is located in front of the shearing assembly, and the post-shear roller conveyor is located behind the shearing assembly.

[0009] In one embodiment, the transport assembly further includes a rear extension roller conveyor unit, which is positioned in front of the pre-shear roller conveyor unit.

[0010] In one embodiment, the detection assembly further includes a hot metal detector, which is positioned above the gap between the post-machine extension roller conveyor and the pre-shear roller conveyor, for detecting whether the billet has entered the pre-shear roller conveyor.

[0011] A method of using a hydraulic shear system for rapid length setting and precise cutting, including a head-removal cutting mode, is as follows: When the billet is rough rolled by the billet mill and then conveyed to the pre-shearing roller mill by the post-mill extension roller mill, the hot metal detector sends the detected workpiece signal to the controller. The controller instantly starts the operation of the pre-shearing roller mill and adjusts the speed of the post-mill extension roller mill so that the post-mill extension roller mill and the pre-shearing roller mill operate synchronously. When the billet enters the pre-shear roller conveyor and is about to reach the shearing station, it is detected by a laser metal detector installed on the shearing assembly. The detected billet running length data is transmitted to the controller according to the set shearing length. The pre-shear roller conveyor stops running and starts the shearing assembly to shear the billet. After the shearing assembly completes the cutting of the steel billet, the motion sensor set in the lower blade holder and the high-position sensor controlling the stroke of the lower blade holder generate a sensing signal and feed it back. The lower blade holder stops moving upward. During the descent and retraction of the lower blade holder, when the motion sensor and the center position sensor generate a sensing signal, the lower blade holder stops descending and starts the pre-shear roller conveyor unit and the post-shear roller conveyor unit. During the process of the pre-shear roller conveyor unit transferring the steel billet to the post-shear roller conveyor unit, the head of the steel billet pushes the cut-off billet left on the lower blade holder. The cut-off billet falls into the collection trough along the running direction. The steel billet continues to run towards the post-shear roller conveyor unit through the lower blade holder until the tail of the steel billet completely leaves the shearing station. When the laser metal detector detects that the tail of the billet has left the position of the pre-shear roller conveyor, the lower cutter head continues to descend and retract until the moving sensor and the low-position sensor generate a sensing signal, and the shearing assembly stands ready to shear the next billet.

[0012] In one embodiment, the method further includes a fixed-length segmentation mode, as follows: First, determine the distance L between the shear blade of the shearing assembly and the laser velocimeter. When the laser metal detector detects the billet, it feeds back the detection signal to the controller and starts the laser velocimeter. The laser velocimeter feeds back the measured length signal ΔL. Based on the length signal ΔL and the distance L, calculate the measured length of the billet head from the shear blade of the shearing assembly. The measured distance between the billet head and the shear blade is compared with the planned length of the billet in real time. Based on the comparison results, the timing of the automatic stopping of the billet on the pre-shear roller conveyor and the post-shear roller conveyor is determined. After the billet stops on the pre-shear roller conveyor and the post-shear roller conveyor, the shearing assembly is started to shear the billet, realizing automatic fixed-length shearing.

[0013] In one embodiment, in the fixed-length segmentation mode, the distance the billet passes through the shear blade is calculated based on the distance L between the laser velocimeter and the shear blade and the length ΔL. The laser velocimeter is located on the side of the shear blade facing the roller conveyor unit before shearing, and the measured length is the difference between the length ΔL and the distance L.

[0014] In summary, the present invention has the following beneficial effects: This invention achieves automatic rejection of cut-off billets and automatic measurement of billet length for fixed-length shearing. The system employs automatic data processing and control technologies, significantly improving the efficiency of hydraulic shearing for fixed-length shearing. Its design is reasonable, its operation is stable and reliable, and it is easy to operate, maintain, and control. It completely solves the problem of low accuracy in the original fixed-length control shearing system. Furthermore, the adoption of automatic measurement feedback technology reduces manual rejection of cut-off billets and measurement costs, avoids human error, reduces quality disputes, and enhances safety while reducing the labor intensity of operators. In addition, the improved system simplifies operating procedures and reduces human resource allocation costs. It has achieved good results in practical applications, providing manufacturing enterprises with an effective technical means to fully tap the potential of their mills in bar production and further improve the yield of rolled products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] In the diagram: 1. Mid-position sensor; 2. Laser metal detector; 3. Laser velocimeter; 4. Velocimeter control box; 5. PLC system; 6. Human-machine interface system; 101. Hydraulic shear drive unit; 102. Rear extension roller conveyor unit; 103. Front roller conveyor unit; 104. Rear roller conveyor unit; 105. Steel billet; 106. Upper knife holder; 107. Lower knife holder; 108. High-position sensor; 109. Low-position sensor; 110. Motion sensor; 111. Hot metal detector. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It is worth noting that the directional terms such as "up" and "down" used in this article are all relative to the perspective of the attached figures and are only for the purpose of description. They should not be interpreted as limitations on the technical solutions.

[0019] like Figure 1 As shown, this invention proposes a system for rapid length setting and precise cutting with hydraulic shears, including a controller and a shearing assembly, a transport assembly, and a detection assembly connected to the controller, as detailed below: A shearing station is set up inside the transport component; The shearing assembly includes a hydraulic shear drive unit 101, a lower blade holder 107, and an upper blade holder 106. The hydraulic shear drive unit is located within and below the shearing station. When the upper blade holder 106 contacts the lower blade holder 107, a shear blade is formed. The lower blade holder 107 is mounted on the hydraulic shear drive unit 101, and the upper blade holder 106 is located above the lower blade holder 107 and above the shearing station. A motion sensor 110 is provided on the side of the lower blade holder 107. The hydraulic shear drive unit 101 drives the lower blade holder 107 to rise to the position of the upper blade holder 106, thereby lowering the blade... The steel billet 105 between the lower shear seat 107 and the upper shear seat 106 is cut off. After the shearing is completed, the lower shear seat 107 is reset. The lower shear seat 107 is in the lowest position when it is at its lowest position. The lower shear seat 107 is in the high position when it rises to the position of the upper shear seat 106. The lower shear seat 107 is in the middle position when it is between the high and low positions and the top surface of the lower shear seat 107 is on the plane of the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104. In this invention, the hydraulic shear drive device 101 can be a hydraulic cylinder structure.

[0020] The detection components include a center position sensor 1, a laser velocimeter 3, and a laser metal detector 2. The center position sensor 1 is located outside the hydraulic shear drive device 101. When the lower blade holder 107 moves to the center position, the center position sensor 1 detects the movement sensor 110. The laser metal detector 2 is located above the shear blade position, and the laser velocimeter 3 is located above the upper blade holder 106 on the side near the pre-shear roller conveyor unit 103.

[0021] In this invention, the electrical components in the shearing assembly, transport assembly, and detection assembly are all connected to a controller. The controller includes a PLC system 5, a velocimeter control box 4, and a human-machine interface system 6. The laser metal detector 2 and the laser velocimeter 3 are both connected to the velocimeter control box 4, which is connected to the PLC system 5. The PLC system 5 is also connected to the human-machine interface system 6, facilitating operation. The PLC system 5 can also be connected to the hydraulic shear drive device 101 to control its operation.

[0022] Preferably, the detection assembly further includes a high-position sensor 108 and a low-position sensor 109. Both the high-position sensor 108 and the low-position sensor 109 are disposed outside the hydraulic shear drive device 101. The high-position sensor 108 is disposed above the middle-position sensor 1. When the lower cutter holder 107 moves to the high position, the high-position sensor 108 detects the motion sensor 110. The low-position sensor 109 is disposed below the middle-position sensor 1. When the lower cutter holder 107 moves to the low position, the low-position sensor 109 detects the motion sensor 110.

[0023] Preferably, the transport assembly includes a pre-shear roller conveyor unit 103 and a post-shear roller conveyor unit 104, forming a shearing station between them. The shearing roller conveyor unit is located in front of the shearing assembly, and the post-shear roller conveyor unit 104 is located behind the shearing assembly. The function of the transport assembly is to transport the steel billet 105. The pre-shear roller conveyor unit 103 transports the steel billet 105 into the shearing assembly and then stops. After shearing is completed, the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104 cooperate to transport the sheared steel billet 105 to the subsequent process.

[0024] Specifically, the hydraulic shear drive assembly is located between the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104, and is located below the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104. The lower blade holder 107 is disposed on the hydraulic shear drive device 101, and the upper blade holder 106 is located above the lower blade holder 107, and the upper blade holder 106 is located above the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104.

[0025] More preferably, the transport assembly also includes a rear extension roller conveyor unit 102, which is located in front of the pre-shear roller conveyor unit 103.

[0026] More preferably, the detection assembly also includes a hot metal detector 111, which is disposed above the gap between the post-machine extension roller conveyor unit 102 and the pre-shear roller conveyor unit 103, and is used to detect whether the billet 105 enters the pre-shear roller conveyor unit 103.

[0027] Based on the hydraulic shear system for rapid length setting and precise cutting of the present invention, the present invention also proposes a method for using the hydraulic shear system for rapid length setting and precise cutting, including a head removal cutting mode, as follows: When the billet 105 is rough rolled by the billet mill and then conveyed to the pre-shearing roller mill 103 via the post-mill extension roller mill 102, the hot metal detector 111 sends the detected workpiece signal to the controller. The controller instantly starts the operation of the pre-shearing roller mill 103 and simultaneously adjusts the speed of the post-mill extension roller mill 102 so that the post-mill extension roller mill 102 and the pre-shearing roller mill 103 operate synchronously. When the billet 105 enters the pre-shear roller conveyor unit 103 and is about to reach the shearing station, it is detected by the laser metal detector 2 installed on the shearing assembly. The detected running length data of the billet 105 is transmitted to the controller according to the set shearing length. The pre-shear roller conveyor unit 103 stops running and starts the shearing assembly to shear the billet 105. It is easy to understand that the length passing through the shear blade position can be calculated based on the speed of the billet 105 and the time it takes for the laser metal detector 2 to detect the billet 105, thereby determining the shearing length. After the shearing assembly completes the cutting of the billet 105, the motion sensor 110 set in the lower cutter holder 107 and the high-position sensor controlling the stroke of the lower cutter holder 107 generate a sensing signal and feed it back. The lower cutter holder 107 stops moving upward. During the descent and retraction of the lower cutter holder 107, when the motion sensor 110 and the middle position sensor 1 generate a sensing signal, the lower cutter holder 107 stops descending and starts the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104. During the process of the pre-shear roller conveyor unit 103 transferring the billet 105 to the post-shear roller conveyor unit 104, the head of the billet 105 pushes down the cut-off billet left on the lower cutter holder 107. The cut-off billet falls into the collection trough along the running direction. The billet 105 continues to run towards the post-shear roller conveyor unit 104 through the lower cutter holder 107 until the tail of the billet 105 completely leaves the shearing station. When the laser metal detector 2 detects that the tail of the billet 105 has left the position of the pre-shear roller conveyor 103, the lower cutter holder 107 continues to descend and retract until the motion sensor 110 and the low position sensor 109 generate a sensing signal, and the shearing assembly is ready to wait for the shearing of the next billet 105.

[0028] Preferably, the usage method also includes a fixed-length segmentation mode, as follows: First, determine the distance L between the shear blade of the shearing assembly and the laser velocimeter 3. When the laser metal detector 2 detects the billet 105, it feeds back the detection signal to the controller and starts the laser velocimeter 3. The laser velocimeter 3 feeds back the measured length signal ΔL. Based on the length signal ΔL and the distance L, calculate the measured length of the distance between the head of the billet 105 and the shear blade of the shearing assembly. The measured distance between the head of the billet 105 and the shear blade is compared with the planned length of the billet 105 in real time. Based on the comparison results, the timing of the automatic stop of the billet 105 on the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104 is determined. After the billet 105 stops on the pre-shear roller conveyor unit 103 and the post-shear roller conveyor unit 104, the shearing assembly is started to shear the billet 105, realizing automatic fixed-length shearing.

[0029] In the fixed-length segmentation mode, the billet 105 first passes through the shearing assembly until the length behind the shear blade reaches the fixed length, then stops. It is then sheared by the shearing assembly. The laser velocimeter 3, located in front of the shearing assembly, detects the speed of the billet 105 as it passes through the shearing assembly and calculates the length ΔL of the billet 105 passing through the shearing assembly based on the speed value. The distance L between the laser velocimeter 3 and the shear blade and the length ΔL are also calculated. Since the laser velocimeter is located on the side of the shear blade facing the pre-shear roller conveyor 103, the measured length is the difference between the length ΔL and the distance L. When the measured length reaches the fixed length, the pre-shear roller conveyor 103 and the post-shear roller conveyor 104 are stopped to stabilize the billet 105, avoid a large impact on the mobile fixed-length machine, and improve the shearing accuracy.

[0030] This invention achieves automatic rejection of cut-off billets and automatic measurement of the 105mm length of steel billets for fixed-length shearing. The system employs automatic data processing and control technologies, significantly improving the efficiency of hydraulic shearing for fixed-length shearing. Its design is reasonable, its operation is stable and reliable, and it is easy to operate, maintain, and control. It completely solves the problem of low accuracy in the original fixed-length control shearing system. Furthermore, the adoption of automatic measurement feedback technology reduces manual rejection and measurement costs, avoids human error, reduces quality disputes, and enhances safety while reducing the labor intensity of operators. In addition, the improved system simplifies operating procedures and reduces human resource allocation costs. It has achieved good results in practical applications, providing manufacturing enterprises with an effective technical means to fully tap the potential of their mills in bar production and further improve the yield of rolled products.

[0031] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A system for rapid length setting and precise cutting using hydraulic shears, characterized in that, Includes a controller and shearing, transport, and detection components connected to the controller; A shearing station is set up inside the transport component; The shearing assembly includes a hydraulic shear drive unit (101), a lower blade holder (107), and an upper blade holder (106). The hydraulic shear drive unit is located within the shearing station and below the shearing station. When the upper blade holder (106) contacts the lower blade holder (107), a shear blade is formed. The lower blade holder (107) is mounted on the hydraulic shear drive unit (101), and the upper blade holder (106) is located above the lower blade holder (107) and above the shearing station. A motion sensor (110) is mounted on the side of the lower blade holder (107). The detection components include a center position sensor (1), a laser velocimeter (3), and a laser metal detector (2). The center position sensor (1) is located outside the hydraulic shear drive unit (101). When the lower blade holder (107) moves to the center position, the center position sensor (1) detects the movement sensor (110). The laser metal detector (2) is located above the shear blade position. The laser velocimeter (3) is located above the upper blade holder (106) near the pre-shear roller conveyor unit (103).

2. The hydraulic shearing system for rapid length setting and precise cutting as described in claim 1, characterized in that, The detection assembly also includes a high-position sensor (108) and a low-position sensor (109). Both the high-position sensor (108) and the low-position sensor (109) are located outside the hydraulic shear drive device (101). The high-position sensor (108) is located above the middle-position sensor (1). When the lower cutter head (107) moves to the high position, the high-position sensor (108) detects the motion sensor (110). The low-position sensor (109) is located below the middle-position sensor (1). When the lower cutter head (107) moves to the low position, the low-position sensor (109) detects the motion sensor (110).

3. The hydraulic shearing system for rapid length setting and precise cutting as described in claim 1, characterized in that, The transport assembly includes a pre-shear roller conveyor unit (103) and a post-shear roller conveyor unit (104), forming a shearing station between the pre-shear roller conveyor unit (103) and the post-shear roller conveyor unit (104). The shearing roller conveyor unit is located in front of the shearing assembly, and the post-shear roller conveyor unit (104) is located behind the shearing assembly.

4. The hydraulic shearing system for rapid length setting and precise cutting as described in claim 3, characterized in that, The transport assembly also includes a rear extension roller conveyor unit (102), which is located in front of the pre-shear roller conveyor unit (103).

5. The hydraulic shearing system for rapid length setting and precise cutting as described in claim 4, characterized in that, The detection assembly also includes a hot metal detector (111), which is located above the gap between the post-machine extension roller conveyor unit (102) and the pre-shear roller conveyor unit (103) to detect whether the billet (105) enters the pre-shear roller conveyor unit (103).

6. A method of using the hydraulic shear system for rapid length setting and precise cutting as described in claim 5, characterized in that, Including the head-removal mode, as follows: When the billet (105) is rough rolled by the billet mill and then conveyed to the pre-shear roller mill (103) via the post-mill extension roller mill (102), the hot metal detector (111) sends the detected workpiece signal to the controller. The controller instantly starts the operation of the pre-shear roller mill (103) and adjusts the speed of the post-mill extension roller mill (102) so that the post-mill extension roller mill (102) and the pre-shear roller mill (103) operate synchronously. When the billet (105) enters the pre-shear roller conveyor unit (103) and is about to reach the shearing station, it is detected by the laser metal detector (2) set on the shearing assembly. The detected running length data of the billet (105) is transmitted to the controller according to the set shearing length. The pre-shear roller conveyor unit (103) stops running and starts the shearing assembly to shear the billet (105). After the shearing assembly completes the cutting of the steel billet (105), the motion sensor (110) set on the lower cutter holder (107) and the high-position sensor controlling the stroke of the lower cutter holder (107) generate a sensing signal and feed it back. The lower cutter holder (107) stops moving upward. During the descent and retraction of the lower cutter holder (107), when the motion sensor (110) and the mid-position sensor (1) generate a sensing signal, the lower cutter holder (107) stops descending and starts the pre-shear roller conveyor. In the process of the pre-shear roller conveyor (103) transferring the billet (105) to the post-shear roller conveyor (104), the head of the billet (105) pushes down the cut-off blank left on the lower cutter holder (107), and the cut-off blank falls into the collection trough along the running direction. The billet (105) continues to run to the post-shear roller conveyor (104) through the lower cutter holder (107) until the tail of the billet (105) completely leaves the shearing station. When the laser metal detector (2) detects that the tail of the billet (105) leaves the position of the pre-shear roller conveyor (103), the lower cutter holder (107) continues to descend and retract until the motion sensor (110) and the low position sensor (109) generate a sensing signal, and the shearing assembly is ready to wait for the shearing of the next billet (105).

7. The method of use as described in claim 6, characterized in that, It also includes a fixed-length segmentation mode, as follows: First, determine the distance L between the shear blade of the shearing assembly and the laser velocimeter (3). When the laser metal detector (2) detects the billet (105), it feeds back the detection signal to the controller and starts the laser velocimeter (3). The laser velocimeter (3) feeds back the measured length signal ΔL. Based on the length signal ΔL and the distance L, calculate the measured length of the billet (105) head from the shear blade of the shearing assembly. The measured length of the steel billet (105) head from the shear blade is compared with the planned length of the steel billet (105) in real time. Based on the comparison results, the timing of the automatic stop of the steel billet (105) on the pre-shear roller conveyor (103) and the post-shear roller conveyor (104) is determined. After the steel billet (105) stops on the pre-shear roller conveyor (103) and the post-shear roller conveyor (104), the shearing assembly is started to shear the steel billet (105) to achieve automatic fixed-length shearing.

8. The method of use as described in claim 7, characterized in that, In the fixed-length segmentation mode, the distance of the billet (105) through the shear blade is calculated based on the distance L between the laser velocimeter (3) and the shear blade and the length ΔL; The laser speed meter is located on the side of the shear blade facing the roller conveyor unit (103) before shearing, and the measured length is the difference between the length ΔL and the distance L.

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