Fixed-length flying shear device and shearing method thereof
The fixed-length flying shear device driven by a combination of variable frequency motor and servo motor solves the problem of high cost of single servo motor drive, achieves a shearing effect that balances high precision and economy, reduces equipment cost and improves motion stability.
Patent Information
- Application Number
- CN202511581532.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-01-02
AI Technical Summary
In the existing technology, flying shear devices driven by a single servo motor can ensure cutting accuracy, but the equipment cost is high, making it difficult to meet the dual requirements of economy and high precision in industrial production.
The system employs a combination of variable frequency motors and servo motors for drive. The variable frequency motors provide high torque during acceleration and deceleration, while the servo motors provide high-precision control during constant speed. Power source switching is achieved through dual input shaft reducers and proximity switches. Combined with linear guides and slider guidance, this ensures stable movement of the shear blade body.
This reduces equipment costs while ensuring cutting accuracy and motion stability, achieving efficient fixed-length cutting.
Smart Images
Figure CN121245075A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of strip shearing, in particular to a fixed-length flying shear device and a shearing method thereof. BACKGROUND
[0002] In the continuous production and processing line of the metallurgical industry, the fixed-length shearing of the strip steel is one of the key processes. With the continuous improvement of the quality requirements of industrial production on the strip steel products, the precision requirements of the fixed-length shearing of the strip steel are also increasingly improved. At present, in order to realize high-speed and precise shearing operation, the flying shear in the prior art usually adopts a single servo motor as a driving component. Since the flying shear in the working process is divided into an acceleration section, a uniform speed section (shearing section), a deceleration section, a return acceleration section, a return uniform speed section and a return deceleration section. Among them, in the acceleration section and the deceleration section, the flying shear needs a larger acceleration, which requires the driving motor to have a larger torque; and in the uniform speed section (shearing section), the flying shear only needs to maintain uniform speed movement to complete shearing, and the torque requirement of the motor is lower, but the position control precision requirement of the motor is extremely high. If a single servo motor is used for driving, in order to meet the demand for large torque in the acceleration and deceleration stages, a high-power servo motor must be selected. However, the cost of a high-power servo motor is high, which will significantly increase the overall manufacturing cost of the equipment, and at the same time, the performance of the high-power servo motor cannot be fully utilized in the uniform speed shearing stage, causing waste of resources. As can be seen, the single driving mode is difficult to effectively control the equipment cost while ensuring the shearing precision, and cannot well meet the dual demands of economy and high precision in industrial production. Therefore, there is an urgent need for a flying shear device that can reduce equipment cost while ensuring fixed-length shearing precision to solve the above problems existing in the prior art. SUMMARY
[0003] Therefore, the present application provides a fixed-length flying shear device and a shearing method thereof, which can reduce equipment cost while ensuring fixed-length shearing precision.
[0004] To solve the above technical problems, the application provides a fixed-size flying shear device, which comprises a rack, a guide assembly, a power assembly, a transmission assembly, a shear blade body and a control assembly, the guide assembly is installed on the rack and connected with the shear blade body, and is used for guiding the reciprocating movement of the shear blade body, the power assembly is installed on the rack and comprises a variable frequency motor and a servo motor, and is used for providing power for the reciprocating movement of the shear blade body, the transmission assembly is connected between the power assembly and the shear blade body, and is used for converting the movement of the variable frequency motor and the servo motor and switchably transmitting the movement to the shear blade body, the shear blade body sequentially passes through an initial position and a shearing starting position when moving forward, the shear blade body sequentially passes through a first return position, a second return position and the initial position when moving reversely, the shear blade body stops at the initial position, the shear blade body starts shearing the moving strip from the shearing starting position when moving forward, and the control assembly comprises a controller and is used for controlling the power assembly and the shear blade body.
[0005] Further, the transmission assembly comprises a double-input shaft reducer, a gear and a rack, the double-input shaft reducer is installed on the rack, two power input shafts of the double-input shaft reducer are connected with the variable frequency motor and the servo motor respectively, the gear is rotatably installed on the rack, a gear shaft of the gear is connected with a power output shaft of the double-input shaft reducer, and the rack is fixed on the shear blade body and engaged with the gear.
[0006] Further, the guide assembly comprises a linear guide rail and a sliding block, the linear guide rail is fixed on the rack, the sliding block is slidingly connected with the linear guide rail, and the shear blade body is connected with the sliding block.
[0007] Further, the control assembly further comprises a first position sensor, a second position sensor and a third position sensor, the first position sensor is arranged at the shearing starting position, is used for detecting whether the shear blade body arrives at the shearing starting position when moving forward, the control assembly controls the variable frequency motor and the servo motor to switch work according to the first position sensor, the second position sensor is arranged at the first return position, is used for detecting whether the shear blade body arrives at the first return position when moving reversely, the third position sensor is arranged at the second return position, is used for detecting whether the shear blade body arrives at the second return position when moving reversely, and the control assembly controls the variable frequency motor and the servo motor to switch work according to the second position sensor and the third position sensor.
[0008] Further, the first position sensor, the second position sensor and the third position sensor are all proximity switches.
[0009] Furthermore, the distance between the first return position and the second return position is 0.8-1.2m.
[0010] Furthermore, the distance between the second return position and the initial position is 0.3-0.5m.
[0011] The present invention also provides a cutting method for the fixed-length flying shear device, comprising the following steps: S1. Control the variable frequency motor to start and rotate in the forward direction. The variable frequency motor drives the shear blade body to accelerate from the initial position in the forward direction with a first acceleration until it reaches the shearing start position. S2. Control the variable frequency motor to stop, control the servo motor to start and rotate in the forward direction, and the servo motor drives the shear blade body to continue moving in the forward constant speed at a first constant speed until the shearing is completed. The first constant speed is the same as the strip moving speed. S3. Control the servo motor to stop, control the variable frequency motor to start and rotate in the forward direction, and the variable frequency motor drives the shear blade body to continue to decelerate in the forward direction with a second acceleration until it returns to the initial speed. S4. Control the variable frequency motor to rotate in the opposite direction. The variable frequency motor drives the shear blade body to accelerate in the opposite direction with a third acceleration until it reaches the first return position. S5. Control the variable frequency motor to stop, control the servo motor to start and rotate in the opposite direction, and drive the shear blade body to move in the opposite direction at a second constant speed until it reaches the second return position. S6. Control the servo motor to stop, control the variable frequency motor to start and rotate in the opposite direction, and the variable frequency motor drives the shear blade body to continue to move in the opposite direction with a fourth acceleration until it reaches the initial position.
[0012] Furthermore, in step S3, the initial return velocity is 0.5-0.8 m / s.
[0013] Furthermore, in step S5, the second constant speed is 1.0-1.5 m / s.
[0014] The technical solution of the present invention has the following advantages compared with the prior art: 1. Cost reduction: In the acceleration and deceleration sections and return acceleration and deceleration sections where high torque is required but low precision is required, relatively low-cost variable frequency motors are used for driving; servo motors are only used for driving the uniform speed shearing section and return uniform speed section where extremely high precision is required, eliminating the need to select high-power servo motors, which greatly reduces the manufacturing cost of the equipment. 2. Shearing accuracy guarantee: In the critical uniform speed shearing section, the high-precision position control capability of the servo motor ensures that the shear blade body can move accurately, realizing high-precision fixed-length shearing of strip steel and meeting the requirements of industrial production for strip steel shearing accuracy. 3. High motion stability: The linear guide pair guides the movement of the shear blade body, ensuring the stability of the shear blade body during movement; at the same time, the proximity switch enables precise switching between the frequency conversion motor and the servo motor, avoiding motion impact during motor switching and further improving the stability of the flying shear movement. Attached Figure Description
[0015] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0016] Figure 1 This is a schematic diagram of the fixed-length flying shear device disclosed in this invention; Figure 2 This is a schematic diagram showing the connection between the power component and the transmission component disclosed in this invention. Figure 3 This is a block diagram illustrating the control principle of the fixed-length flying shear device disclosed in this invention; Figure 4 This is a diagram showing the movement path of the shear blade body disclosed in this invention; Figure 5 This is a graph showing the change in the moving speed of the shear blade body disclosed in this invention.
[0017] Among them, 1. Frame; 2. Shear blade body; 31. Variable frequency motor; 32. Servo motor; 41. Dual input shaft reducer; 42. Gear; 43. Rack; 51. Linear guide rail; 52. Slider; 61. Controller; 62. First position sensor; 63. Second position sensor; 64. Third position sensor; A. Initial position; B. Shearing start position; C. First return position; D. Second return position. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.
[0019] See Figures 1 to 5 As shown, this invention discloses an embodiment of a fixed-length flying shear device.
[0020] The fixed-length flying shear device includes a frame 1, a guide assembly, a power assembly, a transmission assembly, a shear blade body 2, and a control assembly. The guide assembly is mounted on the frame 1 and connected to the shear blade body 2, and is used to guide the reciprocating motion of the shear blade body 2. The power assembly is mounted on the frame 1 and includes a variable frequency motor 31 and a servo motor 32, and is used to provide power for the reciprocating motion of the shear blade body 2. The transmission assembly is connected between the power assembly and the shear blade body 2, and is used to convert and switchably transmit the motion of the variable frequency motor 31 and the servo motor 32 to the shear blade body 2. When the shear blade body 2 moves forward, it passes through the initial position A and the shearing start position B in sequence. When the shear blade body 2 moves backward, it passes through the first return position C, the second return position D, and the initial position A in sequence. The shear blade body 2 stops at the initial position A. When the shear blade body 2 moves forward, it starts shearing the strip from the shearing start position B. The control assembly includes a controller 61, which is used to control the power assembly and the shear blade body 2.
[0021] As described above, the fixed-length flying shear device is a dynamic shearing equipment used in continuous production lines, completing precise cutting while the material is moving at high speed. The shearing is synchronized with the material movement, requiring no machine stoppage and not affecting production line efficiency. It can precisely cut continuously moving materials into fixed lengths. The frame 1 serves as the supporting structure of the flying shear device, ensuring the stable operation of the entire device. The guide assembly refers to the linear guide assembly that limits the movement trajectory, ensuring that the shear blade body 2 moves smoothly along the set trajectory. The variable frequency motor 31 in the power assembly refers to an AC motor whose speed is adjusted by changing the power supply frequency; its characteristics are high starting torque and low cost. The servo motor 32 refers to a precision drive motor with a closed-loop control assembly; its characteristics are high positioning accuracy but higher cost. The transmission assembly refers to a mechanical transmission assembly with power switching function, capable of converting the rotational motion of different motors into linear motion. The shear blade body 2 is the actuator of the fixed-length flying shear, used to shear the moving strip material.
[0022] Specifically, during the operation of the continuous strip steel production line, when the strip reaches the set length, the controller 61 first starts the variable frequency motor 31 to drive the shear blade body 2 to accelerate. When approaching the shearing position, it switches to the servo motor 32 to drive the shear blade body and the strip in sync to complete the precise shearing. After shearing, it switches back to the variable frequency motor 31 for deceleration and return motion.
[0023] The above technical solution utilizes a power switching mechanism to allow both types of motors to operate under optimal conditions. The variable frequency motor handles high-torque conditions, while the servo motor handles high-precision conditions. The servo motor can utilize lower power, significantly reducing costs. This combined application of power sources ensures shearing accuracy while reducing costs.
[0024] In this embodiment, the transmission assembly further includes a dual-input shaft reducer 41, a gear 42, and a rack 43. The dual-input shaft reducer 41 is mounted on the frame 1. The two power input shafts of the dual-input shaft reducer 41 are respectively connected to the variable frequency motor 31 and the servo motor 32. The gear 42 is rotatably mounted on the frame 1. The gear shaft of the gear 42 is connected to the power output shaft of the dual-input shaft reducer 41. The rack 43 is fixed on the frame 1, and the rack 43 meshes with the gear 42.
[0025] In the above text, the dual-input shaft reducer 41 refers to a reduction device with two independent power input interfaces. Its two input shafts receive power input from the variable frequency motor 31 and the servo motor 32, respectively, and selectively transmit one type of power to the output shaft through an internal transmission component. The gear 42 is rotatably mounted on the frame 1 via bearings, and its gear shaft is rigidly connected to the output shaft of the dual-input shaft reducer 41 via a coupling. The rack 43 refers to a linear track structure with continuous tooth profile, fixed to the surface of the shear blade body 2.
[0026] Specifically, during the strip shearing process, when high torque drive is required, the variable frequency motor 31 transmits power to the gear 42 through the dual-input shaft reducer 41. The meshing action of the gear 42 and the fixed rack 43 converts the rotational motion into linear acceleration or deceleration motion of the shear blade body 2. When high-precision speed control is required, the servo motor 32 drives the gear 42 through the same dual-input shaft reducer 41, utilizing the closed-loop control characteristics of the servo system to achieve precise synchronous movement between the shear blade body 2 and the strip. The switching control of the two power sources through the dual-input shaft reducer 41 avoids power interference and achieves the sharing of transmission paths.
[0027] Through the above technical solution, a dual-input shaft reducer is used to achieve deceleration while switching the power source. The rack and pinion realize the conversion and stable transmission of motion.
[0028] In this embodiment, the guide assembly includes a linear guide rail 51 and a slider 52. The linear guide rail 51 is fixed on the frame 1, and the slider 52 is slidably connected to the linear guide rail 51. The shear blade body 2 is connected to the slider 52.
[0029] In the above text, linear guide 51 refers to a long strip-shaped metal component with a high-precision guiding surface and a stable sliding contact surface. Slider 52 refers to a moving part with rolling elements or sliding pads. The combination of linear guide 51 and slider 52 forms a linear kinematic pair with forced constraints.
[0030] Specifically, the linear guide rail 51 is fixedly installed on the horizontal mounting surface of the frame 1, and the bottom of the slider 52 forms a sliding engagement with the linear guide rail 51. When the power component drives the shear blade body 2, the slider 52 moves linearly along the guide surface of the linear guide rail 51 to ensure that the shear blade body 2 always maintains a consistent trajectory during reciprocating motion.
[0031] The above technical solution, which uses a combination of linear guide rail and slider, improves the rigidity of the motion system and ensures the stability of the guide.
[0032] In this embodiment, the control component further includes a first position sensor 62, a second position sensor 63, and a third position sensor 64. The first position sensor 62 is located at the shearing start position B and is used to detect whether the shear blade body 2 reaches the shearing start position B when moving forward. The second position sensor 63 is located at the first return position C and is used to detect whether the shear blade body 2 reaches the first return position C when moving backward. The third position sensor 64 is located at the second return position D and is used to detect whether the shear blade body 2 reaches the second return position D when moving backward. The controller 61 controls the switching operation of the frequency converter motor 31 and the servo motor 32 according to the first position sensor 62, the second position sensor 63, and the third position sensor 64.
[0033] In the above description, the first position sensor 62, the second position sensor 63, and the third position sensor 64 are all fixed on the frame 1. The first position sensor 62 is installed at the beginning of the shearing area to capture the critical position where the shear blade body 2 synchronizes with the strip. The second position sensor 63 is used to identify the deceleration switching point during the high-speed return phase. The third position sensor 64 is used to determine the precise stopping time during the reset phase.
[0034] Specifically, when the shear blade body 2 moves forward to the shearing start position, the first position sensor 62 is triggered and issues a command. At this time, the servo motor 32 immediately takes over from the variable frequency motor 31 and enters the constant speed drive mode, while the shear blade body 2 begins the shearing action. When the shear blade body 2 moves backward to the first return position, the second position sensor 63 is triggered and issues a command. At this time, the servo motor 32 immediately takes over from the variable frequency motor 31 and enters the constant speed drive mode, switching the servo motor 32 to a constant speed operation mode. When the shear blade body 2 moves backward to the second return position, the third position sensor 64 is triggered and issues a command. At this time, the variable frequency motor 31 immediately takes over from the servo motor 32 and enters the deceleration drive mode, facilitating accurate stopping at the initial position.
[0035] The above technical solution achieves feedback control through the first position sensor, the second position sensor, and the third position sensor, and adjusts the closed-loop control according to the actual results, thereby improving the accuracy and stability of the control.
[0036] In this embodiment, the first position sensor 62, the second position sensor 63, and the third position sensor 64 are all proximity switches.
[0037] As mentioned above, a proximity switch is a sensor that detects the position of an object through the principle of electromagnetic induction. Specifically, it can be implemented using inductive or capacitive proximity switches, and its detection distance can be adjusted according to actual working conditions. During the detection process, the proximity switch does not need to directly contact moving parts; it triggers a signal output through changes in the magnetic field, effectively avoiding detection errors caused by mechanical wear.
[0038] Specifically, when the shear blade moves forward to the shearing initiation position, the first position sensor generates a trigger signal by detecting changes in the magnetic field of the metal baffle. The control component immediately cuts off the power to the variable frequency motor and starts the servo motor. During the reverse movement, the second and third position sensors detect the metal baffle at different positions to accurately identify the first and second return positions. The millisecond-level response speed of the proximity switch ensures that the motor switching command can be executed in real time when the shear blade reaches the preset position, avoiding positioning deviations caused by contact delays in traditional mechanical limit switches.
[0039] The above technical solution ensures detection accuracy through the non-contact detection method of proximity switches.
[0040] In this embodiment, the distance between the first return position C and the second return position D is 0.8-1.2m.
[0041] In the above text, the distance between the first return position C and the second return position D is the distance that the shear blade body 2 travels at a constant speed during its return. This distance needs to ensure that the shear blade body 2 can enter a stable motion state. If the distance is too large, it will affect the overall efficiency of the return; if the distance is too small, it will be detrimental to the transition of the shear blade body 2 to a stable state. Specifically, the distance between the first return position C and the second return position D is 0.8m, 0.9m, 1m, 1.1m, or 1.2m.
[0042] By setting the distance between the two return positions within a certain range using the above technical solution, both the rapid return of the shear blade body and the return accuracy of the shear blade body can be guaranteed.
[0043] In this embodiment, the distance between the second return position D and the initial position A is 0.3-0.5m.
[0044] In the above text, the distance between the second return position D and the initial position A is the distance of the deceleration motion of the shear blade body 2 when it returns. This distance needs to ensure that the shear blade body 2 can stop when it reaches the initial position A. If the distance is too large, it will affect the overall efficiency of the return. If the distance is too small, it will not be conducive to the smooth deceleration of the shear blade body 2. Specifically, the distance between the second return position D and the initial position A is 0.3m, 0.4m or 0.5m.
[0045] By setting the distance between the second return position and the initial position within a certain range using the above technical solution, it is possible to ensure both the rapid return of the shear blade body and the return accuracy of the shear blade body.
[0046] The cutting method of the above-mentioned fixed-length flying shear device is described below, including the following steps: S1. Control the above-mentioned variable frequency motor 31 to start and rotate in the forward direction. The above-mentioned variable frequency motor 31 drives the above-mentioned shear blade body 2 to accelerate from the initial position A in the forward direction with the first acceleration until it reaches the shearing start position B. S2. Control the above-mentioned variable frequency motor 31 to stop, control the above-mentioned servo motor 32 to start and rotate in the forward direction, the above-mentioned servo motor 32 drives the above-mentioned shear blade body 2 to continue to move in the forward constant speed at a first constant speed until the shearing is completed, the above-mentioned first constant speed is the same as the strip moving speed. S3. Control the servo motor 32 to stop, control the variable frequency motor 31 to start and rotate in the forward direction, and the variable frequency motor 31 drives the shear blade body 2 to continue to decelerate in the forward direction with the second acceleration until it returns to the initial speed. S4. Control the variable frequency motor 31 to rotate in the opposite direction. The variable frequency motor 31 drives the shear blade body 2 to accelerate in the opposite direction with a third acceleration until it reaches the first return position C. S5. Control the above-mentioned variable frequency motor 31 to stop, control the above-mentioned servo motor 32 to start and rotate in the opposite direction, the above-mentioned servo motor 32 drives the above-mentioned shear blade body 2 to move in the opposite constant speed at the second constant speed until it reaches the second return position D. S6. Control the servo motor 32 to stop, control the variable frequency motor 31 to start and rotate in the opposite direction, and the variable frequency motor 31 drives the shear blade body 2 to continue to move in the opposite direction with a fourth acceleration until it reaches the initial position A.
[0047] In the above text, the first acceleration refers to the acceleration value output by the variable frequency motor 31 during the forward acceleration phase, used to quickly increase the movement speed of the shear blade body 2. The second acceleration refers to the acceleration value output by the variable frequency motor 31 during the forward deceleration phase, used to reduce the movement speed of the shear blade body. The third acceleration refers to the acceleration value output by the variable frequency motor 31 during the reverse acceleration phase, used to drive the shear blade body to quickly reset. The fourth acceleration refers to the acceleration value output by the variable frequency motor 31 during the reverse deceleration phase, used to ensure that the shear blade body comes to a smooth stop at the initial position.
[0048] Specifically, the working cycle of the flying shear is as follows: 1. Acceleration Phase: The shear blade body begins to move from its initial position. During this phase, the variable frequency motor provides power, driving the shear blade body to accelerate. Before the shear blade body reaches the proximity switch detection position, it is always driven by the variable frequency motor, and the acceleration distance is fixed to ensure that the shear blade body can steadily accelerate to the preset speed. 2. Constant Speed Section (Shearing Section): When the proximity switch detects that the shear blade body has reached the completion position of the acceleration section, it sends a signal, at which point the drive mode switches to servo motor drive. The servo motor has high-precision position control capability, which can accurately control the movement speed and position of the shear blade body, ensuring that the shear blade body completes the fixed-length shearing of the strip steel in a constant speed motion state, thus guaranteeing shearing accuracy; 3. Deceleration section: After shearing is completed, the drive mode is switched back to the variable frequency motor. The variable frequency motor drives the shear blade body to decelerate until the speed of the shear blade body is reduced to the preset value. 4. Return acceleration phase: After the shear blade body decelerates to the preset value, the variable frequency motor continues to drive the shear blade body to accelerate in the opposite direction, so that the shear blade body quickly returns to the area close to the initial position; 5. Return to constant speed segment: When the shear blade body moves to the area close to the initial position, in order to ensure that the shear blade body can return to the initial position smoothly, the drive mode is switched to servo motor. The servo motor precisely controls the movement speed of the shear blade body, so that the shear blade body moves towards the initial position at a constant speed. 6. Return deceleration phase: When the shear blade body approaches the initial position, the drive mode switches to variable frequency motor. The variable frequency motor drives the shear blade body to decelerate, eventually bringing the shear blade body back to the initial position accurately, completing a complete work cycle. By separating the high torque demand stage from the high precision control stage, the variable frequency motor is responsible for the acceleration and deceleration motion with a large load, while the servo motor is only responsible for the uniform motion that requires precise speed matching. This reduces the power requirements of the servo motor and solves the problem of balancing equipment economy and control precision in traditional solutions.
[0049] In this embodiment, in step S3, the initial return velocity is 0.5-0.8 m / s.
[0050] In the above text, the initial return speed is a preset speed, which needs to ensure that the variable frequency motor 31 can smoothly transition from forward to reverse direction. If the initial return speed is too high, it will not be conducive to the smooth transition of the variable frequency motor 31 from forward to reverse direction. If the initial return speed is too low, the distance or time of the forward movement of the shear blade body 2 will increase, resulting in the entire cycle of the reciprocating motion of the shear blade body 2 not being minimized. Specifically, the initial return speed is 0.5 m / s, 0.6 m / s, 0.7 m / s, or -0.8 m / s.
[0051] By setting the initial return speed within a certain range using the above technical solution, it is possible to ensure that the variable frequency motor can smoothly transition from forward to reverse direction, while minimizing the entire cycle of the shear blade's reciprocating motion.
[0052] In this embodiment, in step S5, the second constant speed is 1.0-1.5 m / s.
[0053] In the above text, the second constant speed is the speed at which the shear blade body 2 moves at a constant speed during its return. The second constant speed cannot be too high, otherwise it will be detrimental to the subsequent deceleration of the shear blade body 2; the second constant speed cannot be too low, otherwise it will be detrimental to the acceleration connection with the preceding section of the shear blade body 2. Specifically, the aforementioned second constant speed is 1.0 m / s, 1.1 m / s, 1.2 m / s, 1.3 m / s, 1.4 m / s, or 1.5 m / s.
[0054] By using the above technical solution, the second constant speed is set within a certain range, which can be smoothly connected with the acceleration and deceleration phases.
[0055] The specific working process of the above-mentioned fixed-length flying shear device is described below: 1. Initial state: The shear blade body is in the initial position, and both the frequency converter motor and the servo motor are in the stopped state; 2. Acceleration Section: When shearing operations are required, the controller issues a command to start the variable frequency motor. The power output from the variable frequency motor is transmitted to the reducer via a coupling. After being reduced in speed and torque by the reducer, it is transmitted to the gear. The rotation of the gear drives the rack and the shear blade body to accelerate along the linear guide rail. Before the shear blade body reaches the detection range of the proximity switch, it is always driven by the variable frequency motor, and the acceleration distance is fixed, ensuring that the shear blade body can stably accelerate to the preset shearing speed. 3. Constant Speed Section (Shearing Section): When the shear blade moves into the detection range of the proximity switch, the proximity switch detects the shear blade and transmits a signal to the controller. Upon receiving the signal, the controller immediately stops the variable frequency motor and starts the servo motor. The power output from the servo motor is transmitted to the gears via the coupling and reducer, driving the shear blade to move along the linear guide at a constant speed. During this process, the shear blade performs fixed-length shearing on the passing strip steel. Because the servo motor has high-precision position control capabilities, it can accurately control the movement speed and position of the shear blade, thereby ensuring the shearing accuracy of the strip steel. 4. Deceleration Section: After the strip shearing is completed, the controller issues a command to stop the servo motor and start the variable frequency motor. The variable frequency motor rotates in the opposite direction, driving the shear blade body to decelerate along the linear guide rail through the reducer, gears, and rack until the speed of the shear blade body is reduced to the preset return acceleration initial speed.
[0056] 5. Return acceleration phase: After the shear blade body decelerates to the preset speed, the variable frequency motor continues to rotate in the opposite direction, driving the shear blade body to accelerate in the opposite direction, so that the shear blade body moves quickly back to the initial position. 6. Return to constant speed segment: When the shear blade body moves to the preset area close to the initial position, the controller stops the variable frequency motor and starts the servo motor. The servo motor drives the shear blade body to move back to the initial position at a constant low speed, ensuring that the shear blade body can smoothly approach the initial position; 7. Return deceleration phase: When the shear blade body approaches the initial position, the controller controls the servo motor to reduce its speed, driving the shear blade body to decelerate. When the shear blade body accurately returns to the initial position, the controller controls the servo motor to stop, completing a full shearing cycle.
[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A fixed-length flying shear device, characterized in that, The device includes a frame, a guide assembly, a power assembly, a transmission assembly, a shear blade body, and a control assembly. The guide assembly is mounted on the frame and connected to the shear blade body, guiding the reciprocating motion of the shear blade body. The power assembly, mounted on the frame, includes a variable frequency motor and a servo motor, providing power for the reciprocating motion of the shear blade body. The transmission assembly connects the power assembly and the shear blade body, converting and switchably transmitting the motion of the variable frequency motor and the servo motor to the shear blade body. When the shear blade body moves forward, it sequentially passes through an initial position and a shearing start position. When the shear blade body moves backward, it sequentially passes through a first return position, a second return position, and the initial position, stopping at the initial position. When the shear blade body moves forward, it starts shearing the moving strip from the shearing start position. The control assembly includes a controller for controlling the power assembly and the shear blade body.
2. The fixed-length flying shear device according to claim 1, characterized in that, The transmission assembly includes a dual-input shaft reducer, a gear, and a rack. The dual-input shaft reducer is mounted on the frame, and its two power input shafts are respectively connected to the variable frequency motor and the servo motor. The gear is rotatably mounted on the frame, and its gear shaft is connected to the power output shaft of the dual-input shaft reducer. The rack is fixed to the shear blade body, and the rack meshes with the gear.
3. The fixed-length flying shear device according to claim 1, characterized in that, The guiding assembly includes a linear guide rail and a slider. The linear guide rail is fixed to the frame, the slider is slidably connected to the linear guide rail, and the shear blade body is connected to the slider.
4. The fixed-length flying shear device according to claim 1, characterized in that, The control component further includes a first position sensor, a second position sensor, and a third position sensor. The first position sensor is located at the shearing start position and is used to detect whether the shear blade body reaches the shearing start position when moving forward. The control component controls the variable frequency motor and the servo motor to switch operations based on the first position sensor. The second position sensor is located at the first return position and is used to detect whether the shear blade body reaches the first return position when moving backward. The third position sensor is located at the second return position and is used to detect whether the shear blade body reaches the second return position when moving backward. The control component controls the variable frequency motor and the servo motor to switch operations based on the second position sensor and the third position sensor.
5. The fixed-length flying shear device according to claim 4, characterized in that, The first position sensor, the second position sensor, and the third position sensor are all proximity switches.
6. The fixed-length flying shear device according to claim 4, characterized in that, The distance between the first return position and the second return position is 0.8-1.2m.
7. The fixed-length flying shear device according to claim 4, characterized in that, The distance between the second return position and the initial position is 0.3-0.5m.
8. The cutting method of the fixed-length flying shear device according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Control the variable frequency motor to start and rotate in the forward direction. The variable frequency motor drives the shear blade body to accelerate from the initial position in the forward direction with a first acceleration until it reaches the shearing start position. S2. Control the variable frequency motor to stop, control the servo motor to start and rotate in the forward direction, and the servo motor drives the shear blade body to continue moving in the forward constant speed at a first constant speed until the shearing is completed. The first constant speed is the same as the strip moving speed. S3. Control the servo motor to stop, control the variable frequency motor to start and rotate in the forward direction, and the variable frequency motor drives the shear blade body to continue to decelerate in the forward direction with a second acceleration until it returns to the initial speed. S4. Control the variable frequency motor to rotate in the opposite direction. The variable frequency motor drives the shear blade body to accelerate in the opposite direction with a third acceleration until it reaches the first return position. S5. Control the variable frequency motor to stop, control the servo motor to start and rotate in the opposite direction, and drive the shear blade body to move in the opposite direction at a second constant speed until it reaches the second return position. S6. Control the servo motor to stop, control the variable frequency motor to start and rotate in the opposite direction, and the variable frequency motor drives the shear blade body to continue to move in the opposite direction with a fourth acceleration until it reaches the initial position.
9. The cutting method of the fixed-length flying shear device according to claim 8, characterized in that, In step S3, the initial return velocity is 0.5-0.8 m / s.
10. The cutting method of the fixed-length flying shear device according to claim 8, characterized in that, In step S5, the second constant speed is 1.0-1.5 m / s.