Method and device for on-line following and sawing to length of non-ferrous seamless pipes

Abstract

The application discloses a non-seam pipe cutting method and device for non-ferrous metal. The device comprises a base, a transverse moving mechanism, a cutting mechanism, a longitudinal moving mechanism, a pipe end detection device, a protection device and a scrap collecting device. The transverse moving mechanism actively outputs a synchronous speed equal to the pipe speed under closed-loop control as the main protection. The cutting mechanism is provided with an elastic buffer assembly on the output shaft, which absorbs the impact and resets when there is a residual speed deviation, as a backup protection. The main and backup protections cooperate to eliminate the impact damage caused by speed deviation of different time scales, and solve the problems of bent pipe, scratch and inclined cut.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting equipment technology, and more specifically, to an online follow-up fixed-length sawing method for seamless non-ferrous metal pipes, mainly used for non-stop online synchronous follow-up sawing of cold-rolled non-ferrous metal seamless pipes such as aluminum alloy, copper alloy, and zirconium alloy. Background Technology

[0002] In the continuous production process of cold-rolled seamless tubes, length cutting is a key process that determines the precision of the finished product, production efficiency, and yield. In the existing technology, in order to achieve non-stop sawing, some solutions have proposed "follow-up flying saw" or "speed synchronous sawing" technology, which controls the sawing carriage to move at the same speed by detecting the real-time conveying speed of the tube, thereby achieving relatively static sawing conditions.

[0003] However, a long-standing, unrecognized, or unresolved technical challenge in this field remains: even with nominal speed synchronization, instantaneous and unpredictable residual speed deviations still exist between the saw blade and the pipe due to factors such as control system response delays, the inertia of mechanical transmission components, and instantaneous fluctuations in pipe output speed. Although these residual deviations are extremely short-lived, for thin-walled or precision pipes, the resulting axial impact force is sufficient to cause pipe bending deformation, external surface scratches, slanted cuts, or even saw blade tooth breakage. Traditional solutions attempt to eliminate residual deviations by improving the response speed and accuracy of the control system, but due to physical limitations (sampling delay, actuator inertia), residual deviations cannot be completely eliminated.

[0004] Therefore, how to further eliminate the impact damage caused by the instantaneous residual speed deviation that cannot be completely avoided even by optimal control, based on existing speed synchronization technology, is a core technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The present invention aims to solve the problem that even if nominal speed synchronization is achieved in the prior art, the instantaneous residual speed deviation caused by the response delay of the control system and mechanical inertia still causes impact damage to the pipe.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A non-ferrous metal seamless tube online following fixed-length sawing device includes: a base; a transverse moving mechanism installed on the upper part of the base, used to actively output a synchronous speed equal to the instantaneous output speed of the finished tube under closed-loop control, realizing the same direction and speed following of the sawing unit and the finished tube, serving as the main protection against jacking; a cutting mechanism including a high-speed motor and a saw blade; a longitudinal moving mechanism installed between the transverse moving mechanism and the cutting mechanism, used to drive the cutting mechanism to feed vertically; a tube end detection device installed on the inlet side of the base; a protective device located around the saw blade; a debris collection device installed on the lower part of the base; an elastic buffer protection component is provided on the output shaft of the cutting mechanism, located behind the saw blade, used to absorb the jacking impact and automatically reset when there is residual speed deviation, serving as a backup protection against jacking; the main protection and the backup protection work together to eliminate the impact damage to the tube caused by speed deviations at different time scales.

[0007] The main protection eliminates predictable systemic speed deviations, while the backup protection absorbs transient residual impacts that the main protection cannot eliminate. The two functions complement each other, completely solving the problem of transient impact damage that cannot be overcome by a single speed synchronization scheme in the existing technology.

[0008] The base includes a lateral movement mechanism fixing seat, a V-shaped material trough, and a base frame; the lateral movement mechanism fixing seat is fixedly installed on the top of the base frame; the V-shaped material trough is fixedly installed on the top of the base frame, and its inner surface is covered with a nylon or polyurethane soft protective layer; the base frame is a frame-type chip collection structure, with a chip receiving cavity and installation space for a collection device inside.

[0009] The beneficial effects of this solution are: the V-shaped trough and soft protective layer prevent the pipe from being scratched, the frame-type base integrates chip collection function, and the structure is compact.

[0010] The debris collection device includes a drawer-type cleaning box, a square-to-round connecting flange, and an industrial cyclone vacuum cleaner; the drawer-type cleaning box is slidably installed in the debris receiving cavity inside the base frame; the square-to-round connecting flange is installed at the rear of the base frame or at the rear of the saw blade, and is used to seal and connect the debris receiving cavity of the base frame with the suction pipe of the industrial cyclone vacuum cleaner; the industrial cyclone vacuum cleaner is connected to the base frame through the square-to-round connecting flange.

[0011] The beneficial effects of this solution are: dual modes of manual cleaning and negative pressure vacuuming, which efficiently removes debris while being environmentally friendly and safe.

[0012] The lateral movement mechanism includes two sets of linear guide rail pairs, bearing seats, a longitudinal movement mechanism mounting base, and a servo electric cylinder. Each set of linear guide rail pairs includes two sliders and one guide rail. The two guide rails are parallel and fixedly installed on the upper surface of the lateral movement mechanism mounting base, and the four sliders are fixedly installed on the lower surface of the longitudinal movement mechanism mounting base and slide in cooperation with the corresponding guide rails. The cylinder body of the servo electric cylinder is fixedly installed at the rear end of the lateral movement mechanism mounting base via the bearing seat, and the end of the telescopic rod of the servo electric cylinder is fixedly connected to the longitudinal movement mechanism mounting base. The servo electric cylinder is equipped with a closed-loop control system. The closed-loop control system collects the rolling parameters of the cold rolling mill in real time and selects different speed calculation formulas according to the motion zone of the finished tube: When the finished tube is in the deformation zone of the cold rolling mill, the instantaneous discharge velocity of the finished tube is calculated using Formula 1: in The instantaneous discharge speed of finished pipes For extension factor, The feed rate (in millimeters per reciprocating stroke) of the rolling mill. This refers to the number of rack reciprocations (times per minute). The slip coefficient, This is the loss coefficient; When the finished pipe is in the rotary feeding zone of the cold rolling mill, the instantaneous discharge speed of the finished pipe is calculated using Formula 2: in The real-time feeding speed (millimeters per second) of the feeding mechanism; The control system determines the motion zone of the finished tube based on the servo encoder signal of the cold rolling mill, automatically selects the corresponding formula to calculate the instantaneous discharge speed, and controls the output of the servo electric cylinder (34) according to the calculation result. Equal driving speeds.

[0013] The beneficial effects of this scheme are: the dual guide rail pairs ensure smooth guidance; the segmented formula accurately matches the different motion patterns of the pipe in the deformation zone and the rotary feeding zone, significantly improving the speed synchronization accuracy and forming the core of the main protection.

[0014] The pipe end detection device is a non-contact photoelectric sensor or laser sensor, which is fixedly installed above the base frame and located on the inlet side of the V-shaped material trough. Its detection center axis coincides with the axis of the finished pipe placed on the V-shaped material trough.

[0015] The beneficial effects of this solution are: non-contact detection avoids damage, coaxial design eliminates detection blind spots, and ensures dimensional accuracy.

[0016] The longitudinal moving mechanism includes a cylinder mounting base, a cylinder, two sets of linear guide rail pairs, and a suspended platform. The cylinder mounting base is fixedly installed on the side of the longitudinal moving mechanism mounting base. The tail of the cylinder is fixed to the cylinder mounting base, and the end of the piston rod is fixedly connected to the suspended platform. Each set of linear guide rail pairs includes two sliders and one guide rail. The two guide rails are arranged vertically and symmetrically and fixedly installed on the longitudinal moving mechanism mounting base. The four sliders are fixedly installed on both sides of the suspended platform and slide in cooperation with the corresponding guide rails. A cutting mechanism is fixedly installed below the suspended platform.

[0017] The beneficial effects of this solution are: the vertically symmetrical double guide rails ensure that the cutting mechanism feeds vertically smoothly without off-center load, thus ensuring a flat and vertical cut.

[0018] The cutting mechanism includes a high-speed motor, a saw blade, a saw blade retainer, a spring, and a fixing nut. The high-speed motor is fixedly installed on the suspended platform, and its output shaft is sequentially assembled with the saw blade, saw blade retainer, spring, and fixing nut along the axial direction. The saw blade retainer and the output shaft are connected by a key to transmit torque. At the same time, the saw blade and the saw blade retainer, as a whole, can slide relative to each other along the axial direction of the output shaft, with the axial clearance of the relative sliding ranging from 0mm to 20mm. The spring is located between the fixing nut and the saw blade retainer, with its two ends abutting against the side of the saw blade retainer and the inner end face of the fixing nut, respectively, and is always in a pre-compressed state, with the pre-compression amount being 5% to 10% of the maximum compression amount of the spring.

[0019] The beneficial effects of this solution are: the precisely defined axial sliding clearance ensures the reliability of the buffer stroke, and the pre-compression design balances the contradiction between sawing rigidity and buffer sensitivity, forming the core of backup protection.

[0020] The axial stiffness coefficient of the spring satisfy And the compression amount under normal sawing follow-up state .

[0021] The beneficial effects of this solution are: by matching parameters, an optimal balance between buffer capacity and sawing rigidity is achieved, which ensures both buffer protection under abnormal impact and positioning accuracy during normal sawing.

[0022] The closed-loop control system is also equipped with a feedforward compensation control module, which predicts the instantaneous discharge speed fluctuation of the finished pipe in the next control cycle based on the real-time working status parameters of the cold rolling mill, and superimposes the predicted value as a feedforward signal into the speed command of the servo electric cylinder.

[0023] The beneficial effects of this scheme are: feedforward compensation effectively shortens the response delay of the control system, reduces dynamic following error, and further improves the main protection performance.

[0024] The closed-loop control system also integrates an adaptive learning module, which continuously collects actual speed data and cut quality parameters during multiple sawing processes, and uses an adaptive learning algorithm to correct and optimize the system parameters in the speed calculation model in real time.

[0025] The beneficial effects of this solution are: enabling the device to adapt to different specifications of pipes and working conditions, continuously optimize control accuracy, and improve versatility and intelligence. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the base, collection device, and tube end detection device of the present invention.

[0028] Figure 3 This is a schematic diagram of the lateral movement mechanism of the present invention.

[0029] Figure 4 This is a schematic diagram of the longitudinal moving mechanism of the present invention.

[0030] Figure 5 This is a schematic diagram of the cutting mechanism of the present invention.

[0031] Explanation of reference numerals in the attached figures: 1. Base; 11. Lateral movement mechanism fixing seat; 12. V-shaped material trough; 13. Base frame; 2. Collection device; 21. Drawer-type cleaning box; 22. Square-to-round connecting flange; 3. Lateral movement mechanism; 31. Two sets of linear guide rail pairs; 311. Slider; 312. Guide rail; 32. Bearing housing; 33. Longitudinal movement mechanism fixed seat; 34. Servo electric cylinder; 4. Pipe end detection device; 5. Longitudinal moving mechanism; 51. Cylinder mounting base; 52. Cylinder; 53. Two sets of linear guide rail pairs; 531. Slider; 532. Guide rail; 54. Suspended platform; 6. Cutting mechanism; 61. High-speed motor; 62. Saw blade; 63. Saw blade retainer; 64. Spring; 65. Fixing nut; 7. Protective devices. Detailed Implementation

[0032] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the drawings of the following embodiments, the same reference numerals appearing in each drawing represent the same features or components, and can be applied to different embodiments.

[0033] Example 1 like Figure 1As shown, this embodiment discloses an online following fixed-length sawing device for seamless non-ferrous metal tubes. The device consists of a base 1, a collecting device 2, a tube end detection device 4, a transverse moving mechanism 3, a longitudinal moving mechanism 5, a cutting mechanism 6, and a protective device 7. The collecting device 2 is embedded inside the base 1, the transverse moving mechanism 3 is fixed to the upper part of the base 1, the longitudinal moving mechanism 5 is installed on the side of the transverse moving mechanism 3, the cutting mechanism 6 is fixed below the longitudinal moving mechanism 5, the tube end detection device 4 is installed on the inlet side of the base 1, and the protective device 7 is set above the base 1 and completely covers the area around the saw blade 62.

[0034] like Figure 2 As shown, base 1 is installed on the ground to support and fix all other components. Base 1 includes a transverse movement mechanism fixing seat 11, a V-shaped material trough 12, and a base frame 13. The transverse movement mechanism fixing seat 11 is a rectangular flat plate structure, fixedly installed above the base frame 13 by bolts, with its length direction consistent with the conveying direction of the finished pipe. The upper surface of the transverse movement mechanism fixing seat 11 is precision machined to form two parallel mounting planes for supporting the transverse movement mechanism 3. The V-shaped material trough 12 is fixedly installed above the base frame 13, with a V-shaped cross-section and an included angle of 90° to 120°. The inner surface of the V-shaped material trough 12 is covered with a nylon or polyurethane soft protective layer with a thickness of 2mm to 5mm. The base frame 13 is a frame-type chip collection structure, welded from steel plates, with an internal chip receiving cavity located directly below the V-shaped material trough 12, with a depth of 700mm to 800mm. A long, narrow window is provided at the bottom of the V-shaped material trough 12 directly above the base frame 13. The sawing debris generated during the sawing process falls naturally into the debris receiving cavity inside the base frame 13 through this window. Adjustable anchor bolts are installed at the four lower corners of the base frame 13 to adjust the level and height of the entire device.

[0035] like Figure 3As shown, the transverse moving mechanism 3 is installed on the upper part of the base 1 and is used to drive the cutting mechanism 6 to perform linear reciprocating motion along the conveying direction of the finished pipe. The transverse moving mechanism 3 includes two sets of linear guide rail pairs 31, bearing seats 32, a longitudinal moving mechanism fixed seat 33, and a servo electric cylinder 34. Each set of linear guide rail pairs 31 includes two sliders 311 and one guide rail 312. The two guide rails 312 are parallel and fixedly installed on the upper surface of the transverse moving mechanism fixed seat 11, and the parallelism tolerance is controlled within 0.02mm. Four sliders 311 are fixedly installed on the lower surface of the longitudinal moving mechanism fixed seat 33 and slide in cooperation with the corresponding guide rails 312. A pre-tight fit is used to eliminate gaps. The longitudinal moving mechanism fixed seat 33 is an L-shaped or rectangular frame structure, which is made of high-strength aluminum alloy or steel plate welded and then processed. The cylinder body of the servo electric cylinder 34 is fixedly installed on the rear end of the transverse moving mechanism fixed seat 11 through the bearing seat 32, and the end of the telescopic rod of the servo electric cylinder 34 is fixedly connected to the longitudinal moving mechanism fixed seat 33 through a floating joint. The servo electric cylinder 34 is equipped with a closed-loop control system. This closed-loop control system exchanges data with the main control system of the cold rolling mill via a fieldbus or analog signal interface.

[0036] The closed-loop control system collects rolling parameters of the cold rolling mill in real time, including elongation coefficient λ, mill feed rate h per reciprocation, number of stand reciprocations n, slip coefficient y, loss coefficient η, and real-time feed speed v_feed of the feeding mechanism. The control system determines the current motion zone of the finished tube based on the servo encoder signals integrated into the cold rolling mill equipment. When the finished tube is in the deformation zone of the cold rolling mill, the instantaneous discharge speed is calculated using Formula 1: When the finished pipe is in the rotary feeding zone of the cold rolling mill, the instantaneous discharge speed is calculated using Formula 2: Based on the calculation results of the selected formula, the closed-loop control system outputs precise speed and position commands to the servo electric cylinder 34 through the servo driver, so that the speed at which the servo electric cylinder 34 drives the longitudinal moving mechanism fixed seat 33 to move along the guide rail 312 is equal to that of the v_pipe.

[0037] like Figure 5As shown, the cutting mechanism 6 is the core component that performs the sawing action. The cutting mechanism 6 includes a high-speed motor 61, a saw blade 62, a saw blade retainer 63, a spring 64, and a fixing nut 65. The high-speed motor 61 is a permanent magnet synchronous motor or an asynchronous motor, with a power of 2.2kW to 15kW and a rated speed of 4000rpm to 12000rpm. The base of the high-speed motor 61 is bolted to the bottom mounting plate of the basket 54. The output shaft of the high-speed motor 61 extends horizontally along the axial direction, and the saw blade 62, saw blade retainer 63, spring 64, and fixing nut 65 are sequentially mounted axially on its shaft end. The saw blade 62 is a circular saw blade made of ultra-hard material, with a diameter of 300mm to 500mm and a thickness of 1.5mm to 4mm. The saw blade retainer 63 is a stepped circular structure with a hole in the center that mates with the output shaft. The inner wall of the hole has a keyway, allowing axial sliding via a flat key or spline, with an axial sliding clearance range of 0mm to 20mm. Spring 64 is a cylindrical helical compression spring made of alloy spring steel. It is positioned between the fixing nut 65 and the saw blade retainer 63. Its first end abuts against the side of the saw blade retainer 63, and its second end abuts against the inner end face of the fixing nut 65. After assembly, it is in a pre-compressed state, with a pre-compression amount of 5% to 10% of the spring's maximum compression. The fixing nut 65 is screwed onto the output shaft end of the high-speed motor 61 via a threaded connection.

[0038] When the saw blade 62 is subjected to an axial pushing impact from the end face of the finished pipe, the saw blade 62 and the saw blade retainer 63 can slide backward along the output shaft, compressing the spring 64 and converting the impact energy into the elastic potential energy of the spring 64, thereby absorbing and buffering the impact. After the impact disappears, the spring 64 releases the stored elastic potential energy, pushing the saw blade 62 and the saw blade retainer 63 to slide forward and reset.

[0039] like Figure 4 As shown, the longitudinal moving mechanism 5 is installed between the transverse moving mechanism 3 and the cutting mechanism 6, and is used to drive the cutting mechanism 6 to perform linear reciprocating feed in a direction perpendicular to the axis of the finished pipe. The longitudinal moving mechanism 5 includes a cylinder mounting base 51, a cylinder 52, two sets of linear guide rail pairs 53, and a basket 54. The cylinder mounting base 51 is an L-shaped structure and is fixedly installed on the side of the longitudinal moving mechanism mounting base 33. The cylinder 52 is a double-acting cylinder with a cylinder diameter of 50mm to 100mm and a stroke of 50mm to 150mm. Its tail is fixed to the cylinder mounting base 51 by a pin, and the piston rod end is fixedly connected to the basket 54 by a floating joint. Each set of linear guide rail pairs 53 includes two sliders 531 and one guide rail 532. The two guide rails 532 are arranged vertically and symmetrically and fixedly installed on the longitudinal moving mechanism mounting base 33. The four sliders 531 are fixedly installed on both sides of the basket 54 and slide in cooperation with the corresponding guide rails 532. The basket 54 is a frame structure, and the cutting mechanism 6 is fixedly installed below it.

[0040] The pipe end detection device 4 is a non-contact photoelectric sensor or laser sensor, fixedly installed above the base frame 13 and located on the inlet side of the V-shaped material trough 12. Its detection center axis coincides with the axis of the finished pipe placed on the V-shaped material trough 12. When the end of the finished pipe passes through the detection area, the sensor outputs a signal to the control system. The control system calculates the sawing trigger time based on the real-time conveying speed and the predetermined length.

[0041] The protective device 7 is a fully enclosed protective cover that covers the front, rear, left, right and top of the saw blade 62. It is made of steel plate by bending and welding, with sound-absorbing cotton attached to the inner surface. There is an observation window in front and an electric interlock door on the side.

[0042] like Figure 2 As shown, the debris collection device 2 includes a drawer-type cleaning box 21, a square-to-round connecting flange 22, and an industrial cyclone vacuum cleaner. The drawer-type cleaning box 21 is a lidless rectangular drawer structure that is slidably installed in the debris receiving cavity inside the base frame 13, and has a handle at the front. One end of the square-to-round connecting flange 22 has a rectangular interface that is sealed to the chip discharge port at the rear of the base frame 13 or the dust suction port at the rear of the saw blade 62, and the other end has a round interface that is sealed to the suction pipe of the industrial cyclone vacuum cleaner through a flexible hose. When the industrial cyclone vacuum cleaner is working, it generates negative pressure, sucking in and separating the debris for collection.

[0043] Example 2 This embodiment, based on Embodiment 1, further optimizes and limits the parameter design of spring 64. The axial stiffness coefficient k and the maximum allowable compression of spring 64 are specified. The combined mass m of the saw blade 62 and saw blade retainer 63, and the maximum instantaneous acceleration of the finished pipe. The following relationship exists between them: The compression amount Δx_normal of spring 64 under normal sawing following state is controlled to be Δx_normal≤0.3·Δx_max. By reasonably matching the relationship between the spring stiffness coefficient, the maximum compression amount, the saw blade assembly mass, and the maximum instantaneous acceleration of the pipe, an optimized balance between buffer capacity and sawing rigidity is achieved. For example, when m=2kg and a_max=1500mm / s², the minimum required k·Δx_max is 3000N; if Δx_max=6mm, then k≥500N / mm.

[0044] Example 3 This embodiment further optimizes the control strategy of the closed-loop control system based on Embodiment 1. The closed-loop control system of the servo electric cylinder 34 also includes a feedforward compensation control module. The feedforward compensation control module monitors the rate of change of key state parameters of the cold rolling mill in real time, including the rate of change of the mill's reciprocating speed and the rate of change of the feed speed. Based on the current motion region of the finished tube (deformation zone or rotary feeding zone), it selects the corresponding prediction model and calculates the instantaneous discharge speed of the finished tube. In the future time( The predicted change within the response delay time of the control system (typically 10ms to 50ms). The predicted value is superimposed as a feedforward signal into the speed command of the servo electric cylinder 34, that is: The output of the feedforward compensation control module is superimposed on the output of the PID controller via an adder to form a composite control signal that drives the servo electric cylinder 34. Experiments show that after adding feedforward compensation, the speed following error is reduced from ±5mm / s to within ±1mm / s.

[0045] Example 4 This embodiment further enhances the intelligence level of the closed-loop control system based on Embodiment 1. An adaptive learning module is integrated into the closed-loop control system. This module continuously collects and records the actual value of the instantaneous discharge speed of the finished pipe during multiple sawing processes. Actual response speed of servo electric cylinder 34 The quality parameters of the cut end face of the finished pipe after sawing. The adaptive learning module uses a built-in adaptive learning algorithm (such as recursive least squares algorithm) to apply the parameters (slip coefficient) in Formula 1 of the deformation zone. Loss coefficient The feeding speed in Formula 2 for the rotary feeding zone Perform online estimation and correction. Taking the deformation zone as an example, establish a regression model: Online estimation and And update the corresponding parameters in Formula 1. When the pipe billet specification changes from Φ17mm to Φ19mm, the elongation coefficient λ is automatically corrected from 1.2 to 1.35. When the rolling speed changes from 160 times / min to 200 times / min, The value was automatically corrected from 0.8 to 0.7, and the speed synchronization accuracy reached its optimal level after three sawing operations. For the rotary feed area, it was directly adjusted... The measured values ​​are filtered and calibrated.

[0046] Example 5 To verify the synergistic effect of the dual protection mechanism of this invention, a comparative experiment was conducted. Three groups were set up: Group A used only speed synchronization primary protection (without elastic buffer); Group B used only elastic buffer backup protection (without active speed synchronization, passively following); Group C used the primary and backup synergistic protection of this invention. Under the same cold rolling mill output speed (3m / min) and the same pipe material (aluminum alloy thin-walled pipe, 1mm wall thickness), 100 consecutive sawing operations were performed. Results: Group A showed 14 instances of cut tilting and 2 instances of significant bend scratches; Group B showed 32 instances of severely tilted cuts and 1 instance of saw blade tooth breakage; Group C showed 0 defects. This comparative experiment demonstrates that a single protection mechanism cannot completely eliminate impact damage, while the synergistic dual protection of this invention achieves zero-defect sawing.

[0047] Example 6 This embodiment provides a complete description of the collaborative operation of the entire device. When the end of the finished pipe passes the pipe end detection device 4, the control system receives a signal and begins length counting. When the sawing trigger point is reached, the control system first sends a follow command to the lateral movement mechanism 3. The closed-loop control system calculates the current v_pipe length and controls the servo electric cylinder 34 to accelerate to the synchronous speed (main protection activated). After synchronization, the longitudinal movement mechanism 5 drives the cutting mechanism 6 to feed vertically, and the high-speed rotating saw blade 62 cuts into the pipe. If a momentary residual speed deviation occurs between the saw blade 62 and the pipe due to instantaneous speed fluctuations in the cold rolling mill or control response delays (e.g., a sudden 5% increase in the instantaneous speed of the pipe), the saw blade 62 is subjected to axial impact. At this time, the saw blade 62 and the saw blade retainer 63 slide backward along the output shaft axis, and the compression spring 64 absorbs the impact energy (backup protection activated), and the end of the pipe is not subjected to impact force. After the impact disappears, the spring 64 resets. After sawing through, the longitudinal movement mechanism 5 retracts, and the lateral movement mechanism 3 returns to its initial position. The sawing debris collection device 2 operates throughout the sawing process, and the protective device 7 provides closed protection. The adaptive learning module collects data and optimizes parameters after each sawing operation, while the feedforward compensation module improves the dynamic response in real time. Throughout the sawing process, the main protection eliminates most of the predictable speed deviations, while the backup protection absorbs the instantaneous residual impacts that the main protection cannot eliminate. The two complement each other in terms of time scale (the main protection response time is about 50ms, and the backup protection response time is in the millisecond range), together achieving perfect impact-free sawing.

[0048] The above embodiments are merely illustrative of specific implementations of the present invention. Their detailed and specific descriptions are intended to clearly present technical details, but should not be construed as limiting the scope of protection of this invention. For those skilled in the art, the technical features in the above embodiments can be freely combined, and various modifications and improvements can be made without departing from the core concept of the present invention. All such adjustments fall within the protection scope of this invention. Therefore, all transformations and modifications substantially equivalent to the scope of the claims of this invention should be included within the protection scope of the claims of this invention.

Claims

1. A non-ferrous metal seamless tube online following fixed-length sawing device, characterized in that, include: Base (1); The transverse moving mechanism (3) is installed on the upper part of the base (1) and is used to actively output a synchronous speed equal to the instantaneous discharge speed of the finished pipe under closed-loop control, so as to realize that the sawing unit and the finished pipe follow in the same direction and at the same speed, and serve as the main protection against pushing. The cutting mechanism (6) includes a high-speed motor (61) and a saw blade (62). The longitudinal moving mechanism (5) is installed between the transverse moving mechanism (3) and the cutting mechanism (6) and is used to drive the cutting mechanism (6) to feed vertically. Pipe end detection device (4) is installed on the inlet side of base (1); Protective device (7) is provided around the saw blade (62); Debris collection device (2) is installed at the bottom of base (1); The output shaft of the cutting mechanism (6) is provided with an elastic buffer protection component located behind the saw blade (62). It is used to absorb the pushing impact and automatically reset when there is residual speed deviation, serving as a backup protection against pushing. The main protection and backup protection work together to eliminate the impact damage to the pipe caused by speed deviations at different time scales.

2. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 1, characterized in that, The base (1) includes a horizontal moving mechanism fixing seat (11), a V-shaped material trough (12), and a base frame (13). The lateral movement mechanism fixing seat (11) is fixedly installed on the top of the base frame (13) to support the lateral movement mechanism (3). The V-shaped groove (12) is fixedly installed above the base frame (13) to support the finished pipe during the sawing process. The inner surface of the V-shaped groove (12) is covered with a nylon or polyurethane soft protective layer. The base frame (13) is a frame-type chip collection structure, which has a chip receiving cavity and an installation space for the collection device (2) inside.

3. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 2, characterized in that, The debris collection device (2) includes a drawer-type cleaning box (21), a square-to-round connecting flange (22), and an industrial cyclone vacuum cleaner; The drawer-type cleaning box (21) is slidably installed in the debris-receiving cavity inside the base frame (13); The square-to-round connecting flange (22) is installed behind the base frame (13) or behind the saw blade (62) to seal and connect the chip receiving cavity of the base frame (13) with the dust collection pipe of the industrial cyclone vacuum cleaner. The industrial cyclone vacuum cleaner is connected to the base frame (13) via a square-to-round connecting flange (22).

4. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 2, characterized in that, The lateral movement mechanism (3) includes two sets of linear guide rail pairs (31), bearing seats (32), longitudinal movement mechanism fixing seats (33) and servo electric cylinders (34). Each set of linear guide rail pairs (31) includes two sliders (311) and one guide rail (312). The two guide rails (312) are parallel and fixedly installed on the upper surface of the transverse moving mechanism fixed seat (11). The four sliders (311) are fixedly installed on the lower surface of the longitudinal moving mechanism fixed seat (33) and slide in cooperation with the corresponding guide rails (312). The cylinder body of the servo electric cylinder (34) is fixedly installed on the rear end of the transverse moving mechanism fixed seat (11) through the bearing seat (32), and the end of the telescopic rod of the servo electric cylinder (34) is fixedly connected to the longitudinal moving mechanism fixed seat (33). The servo electric cylinder (34) is equipped with a closed-loop control system. The closed-loop control system collects the rolling parameters of the cold rolling mill in real time and selects different speed calculation formulas according to the motion zone of the finished tube: When the finished tube is in the deformation zone of the cold rolling mill, the instantaneous discharge velocity of the finished tube is calculated using Formula 1: in The instantaneous discharge speed of finished pipes This is the extension factor. This refers to the feed rate of the rolling mill in one reciprocating cycle. The number of rack reciprocations. The slip coefficient, This is the loss coefficient; When the finished pipe is in the rotary feeding zone of the cold rolling mill, the instantaneous discharge speed of the finished pipe is calculated using Formula 2: in The real-time feeding speed of the feeding mechanism; The control system determines the motion zone of the finished tube based on the servo encoder signal of the cold rolling mill, automatically selects the corresponding formula to calculate the instantaneous discharge speed, and controls the output of the servo electric cylinder (34) according to the calculation result. Equal driving speeds.

5. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 4, characterized in that, The pipe end detection device (4) is a non-contact photoelectric sensor or laser sensor, which is fixedly installed above the base frame (13) and located on the inlet side of the V-shaped material trough (12). The detection center axis of the pipe end detection device (4) coincides with the axis of the finished pipe placed on the V-shaped material trough (12).

6. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 4, characterized in that, The longitudinal moving mechanism (5) includes a cylinder mounting base (51), a cylinder (52), two sets of linear guide rail pairs (53) and a basket (54); The cylinder mounting base (51) is fixedly installed on the side of the longitudinal moving mechanism mounting base (33); The tail of the cylinder (52) is fixed to the cylinder mounting base (51), and the piston rod end of the cylinder (52) is fixedly connected to the basket (54). Each set of linear guide rail pairs (53) includes two sliders (531) and one guide rail (532). The two guide rails (532) are arranged vertically and symmetrically and are fixedly installed on the longitudinal moving mechanism fixed seat (33). The four sliders (531) are fixedly installed on both sides of the basket (54) and slide in cooperation with the corresponding guide rails (532). The cutting mechanism (6) is fixedly installed below the suspended basket (54).

7. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 6, characterized in that, The cutting mechanism (6) includes a high-speed motor (61), a saw blade (62), a saw blade retainer (63), a spring (64), and a fixing nut (65). The high-speed motor (61) is fixedly installed on the basket (54). The output shaft of the high-speed motor (61) is sequentially equipped with a saw blade (62), a saw blade retainer (63), a spring (64) and a fixing nut (65) along the axial direction. The saw blade retainer (63) and the output shaft of the high-speed motor (61) are connected by a key to transmit torque. Simultaneously, the saw blade (62) and the saw blade retainer (63) as a whole can slide relative to each other along the axial direction of the output shaft. The axial clearance range of this relative sliding is: ; The spring (64) is located between the fixing nut (65) and the saw blade holder (63). The first end of the spring (64) abuts against the side of the saw blade holder (63), and the second end of the spring (64) abuts against the inner end face of the fixing nut (65). The spring (64) is always in a pre-compressed state during the sawing process, and the pre-compression amount is 5% to 10% of the maximum compression amount of the spring.

8. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 7, characterized in that, The axial stiffness coefficient of the spring (64), The following conditions must be met: ； in The axial stiffness coefficient of spring (64) is expressed in Newtons per millimeter. The maximum allowable compression of the spring (64) is expressed in millimeters. The combined mass of the saw blade (62) and the saw blade retainer (63) is expressed in kilograms. The maximum instantaneous acceleration of the finished pipe is expressed in millimeters per square second. Compression of spring (64) in normal sawing following state Control as 。 9. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 4, characterized in that, The closed-loop control system is also equipped with a feedforward compensation control module. The feedforward compensation control module predicts the instantaneous discharge speed fluctuation of the finished pipe in the next control cycle based on the real-time working status parameters of the cold rolling mill, and superimposes the predicted value as a feedforward signal into the speed command of the servo electric cylinder (34) to compensate for the following error caused by the response delay of the control system.

10. The online following fixed-length sawing device for non-ferrous metal seamless tubes according to claim 4, characterized in that, The closed-loop control system also integrates an adaptive learning module. The adaptive learning module continuously collects and records the actual value of the instantaneous discharge speed of the finished pipe, the actual response speed of the servo electric cylinder (34), and the cut quality parameters of the end face of the finished pipe after sawing during multiple sawing processes. The system parameters in the speed calculation formula are corrected and optimized in real time through the built-in adaptive learning algorithm.

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