Sheet metal stamping waste tightening strip cutting machine and cutting control method

Abstract

The invention discloses a sheet metal stamping waste tightening strip cutting machine and a cutting control method, and relates to the technical field of sheet metal stamping, the sheet metal stamping waste tightening strip cutting machine comprises a support, a traction tightening assembly, an anti-dislocation detection assembly, a fixed-length cutting assembly, a waste collecting assembly, a height adjusting assembly and a control unit; the traction tightening assembly adopts a torque motor to drive a roller, limited traction force is applied to a waste material section of the material belt to keep tightening, and the traction force is limited to be smaller than a pressing force threshold value of the feeder; the anti-dislocation detection assembly detects a material belt positioning hole / position state through an optical fiber sensor and outputs an interlocking signal; the fixed-length cutting assembly conducts fixed-length cutting on waste sections in the traction process, and cut waste is collected in a centralized mode through a conveying channel and a waste hopper. The height adjusting assembly is used for keeping the waste section operation plane flush with the mold outlet; the cutting machine is compact in structure and integrally installed on the punching machine tool to achieve high safety, the traction control difficulty is lowered, and the automation level of waste treatment is improved.

Description

Technical Field

[0001] This invention relates to the field of sheet metal stamping technology, and in particular to a waste material tensioning strip cutting machine and cutting control method for sheet metal stamping. Background Technology

[0002] In sheet metal stamping production, a continuous strip feed method is typically used to feed metal sheets into stamping dies to complete multi-station or progressive stamping forming. As the length of stamping dies continues to increase, especially in the application of large dies or multi-station dies, relying solely on a feeder located at the head of the stamping die to advance the strip often makes it difficult to guarantee the accuracy and stability of the strip's positioning at the tail end of the die. This can easily lead to problems such as insufficient feeding, positional misalignment, or slack, which in turn affect stamping accuracy and product quality.

[0003] To address the aforementioned issues, existing technologies typically incorporate a winding machine at the tail end of the stamping die. This machine winds up the scrap material strip, applying reverse traction and tension to maintain its tautness even during the slack feeding phase of the feeder. This ensures the strip is stably pulled and accurately delivered to the processing position of the stamping die. However, in practical applications, the applied tension of this type of winding machine must be strictly controlled to prevent it from exceeding the feeder's clamping force. Otherwise, the strip may be overstretched, leading to feeding pitch irregularities, product misalignment, or even die damage.

[0004] Furthermore, most existing winding machines adopt a freestanding, floor-standing structure, resulting in a large equipment size. This not only requires ample installation and operating space but is also typically located outside the stamping machine, forming a separate structure. This arrangement increases the floor space required for production, reducing the compactness of the production line. Moreover, because the winding, traction, and material belt moving parts are exposed, additional protective covers or fences are often needed, increasing equipment complexity and safety management costs, while still posing certain operational safety hazards.

[0005] Meanwhile, existing winding machines typically only have winding functions, and waste materials need to be cut and collected manually or by auxiliary equipment. The operation process is cumbersome, the waste collection efficiency is low, and it is not conducive to the automation and clean management of the stamping production line.

[0006] In summary, the existing technology has at least the following technical problems: In existing stamping production, the winding machine only has the winding function, which is large in size and has low safety. It also requires precise matching between the winding tension and the pressing force of the feeder, making it difficult to control. Furthermore, the functions of waste cutting and collection are separated, resulting in a low degree of automation. Summary of the Invention

[0007] The purpose of this invention is to provide a waste material tensioning strip cutting machine and cutting control method for sheet metal stamping, so as to solve the technical problems in the existing stamping production where the winding machine only has a winding function, which is large in size and has low safety, requires precise matching between the winding tension and the pressing force of the feeder, is difficult to control, and the waste material cutting and collection functions are separated, resulting in low automation.

[0008] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0009] To address the aforementioned technical problems, the present invention provides the following technical solution: This invention provides a sheet metal stamping scrap tensioning strip cutting machine, including a bracket mounted on a stamping machine frame and adjacent to the tail end of the stamping die; a traction tensioning assembly mounted on the bracket, including an upper roller, a lower roller, and a torque motor, wherein the torque motor drives the upper roller and / or the lower roller to rotate to apply traction force to the scrap section of the strip to keep the strip taut, and the output torque of the torque motor is adjustable to limit the traction force to be less than the pressing force threshold of the feeder of the stamping machine; an anti-misalignment detection assembly including a positioning plate and an optical fiber sensor disposed on the positioning plate for detecting the positioning hole / position status of the strip and outputting an interlocking signal; and a fixed-length cutting assembly disposed on the traction tensioning assembly. Downstream of the tensioning assembly, a component is used to cut the waste section of the strip to a set length during the tensioning process; a waste collection assembly, including a conveying channel and a waste funnel corresponding to the fixed-length cutting assembly, is used to receive and collect the cut waste; a height adjustment assembly is used to adjust the exit height position of the tensioning assembly and / or the fixed-length cutting assembly relative to the stamping die, so that the running plane of the waste section of the strip is flush with the exit of the stamping die; and a control unit is electrically connected to the torque motor, the fiber optic sensor and the fixed-length cutting assembly, and is used to perform coordinated control of tensioning and fixed-length cutting according to the interlocking signal, the pressing force threshold and the set length parameters.

[0010] In one embodiment, the traction tensioning assembly further includes a clamping force adjustment mechanism for adjusting the clamping pressure of the upper roller and the lower roller on the waste section of the material strip; the clamping force adjustment mechanism includes an adjustment unit and a locking unit, the adjustment unit being a screw adjustment structure and / or an eccentric shaft adjustment structure to change the rolling gap or relative position of the upper roller and the lower roller, and the locking unit being used to lock the rolling gap or relative position after adjusting the upper roller and the lower roller.

[0011] In one embodiment, the clamping force adjustment mechanism further includes an elastic preload member and a limiting member. The elastic preload member is a spring or an elastic body, used to apply preload to the upper roller and / or the lower roller to compensate for the thickness fluctuation of the material strip. The limiting member is used to limit the maximum clamping pressure and / or the minimum rolling gap, and is equipped with a scale to realize the visual setting of the clamping pressure or the rolling gap.

[0012] In one embodiment, the height adjustment assembly includes a synchronous lifting mechanism to maintain the relative position of the traction tensioning assembly and the fixed-length cutting assembly during height adjustment. The synchronous lifting mechanism includes multiple guide rods and guide bearings, two drive screws, two drive nuts, two fixed seats and a sliding seat, and a synchronization assembly. The two ends of the multiple guide rods are respectively connected and fixed to the two fixed seats. The guide bearings are slidably sleeved on the guide rods and connected to the sliding seats. The drive nuts are connected and fixed to opposite sides of the sliding seats. The drive screws are drively sleeved inside the drive nuts, and the two ends of the drive screws are rotatably connected to the two fixed seats. The synchronization component is connected to two transmission screws between the sliding seat and the fixed seat at the lower vertical position. Each transmission screw has a handwheel at its end extending beyond the upper fixed seat. Rotating any one of the handwheels drives one of the transmission screws, which in turn drives the other through the synchronization component. This allows for synchronized adjustment of the lifting and lowering of both sides of the sliding seat, achieving balanced lifting of all components on the sliding seat. The lower fixed seat is connected and fixed to the bracket. The sliding seat is equipped with the traction tensioning component, the fixed-length cutting component, the anti-misalignment detection component, and the conveying channel. The upper fixed seat is equipped with the control unit.

[0013] In one embodiment, the height adjustment assembly further includes a height scale and a locking mechanism for visual reading and locking of the height position; the two locking mechanisms are connected to the sliding seat and respectively sleeved on the two transmission screws, and the position of the sliding seat on the transmission screw is locked by the rotation of the screw and the quick-locking wrench.

[0014] In one embodiment, the control unit includes a PLC controller and a human-machine interface terminal, used to set the upper limit of the output torque of the torque motor and the set length of the waste segment of the strip cut by the fixed-length cutting component.

[0015] In one embodiment, the control unit is configured to perform at least one of the following actions when the fiber optic sensor detects that the positioning hole is misaligned or the position offset exceeds a preset threshold: stop the torque motor, prohibit the operation of the fixed-length cutting component, and output a stop or pause interlock signal to the stamping machine and / or the feeder to prevent the stamping die from producing a pressed die or misaligned stamping.

[0016] In one embodiment, the fixed-length cutting assembly includes a cutting blade and a driving mechanism; the control unit triggers the set length parameter by counting the conveying length of the material strip, causing the driving mechanism to operate to achieve periodic fixed-length cutting, and the conveying length counting satisfies one or a combination of the following methods: a rotary encoder is installed at the shaft end of the upper or lower roller of the traction tensioning assembly, and the conveying length is calculated by counting the pulses of the rotary encoder; the conveying length is calculated by counting the positioning holes of the material strip based on the fiber optic sensor and combining the hole spacing parameter; a displacement sensor is installed on the conveying path of the material strip, and the conveying length of the material strip is directly measured by the displacement sensor.

[0017] A method for controlling the cutting of waste tension strips in sheet metal stamping is also provided, which is applied to a waste tension strip cutting machine. The method includes the following steps: S1, traction start: when the stamping machine starts and / or the feeding machine starts feeding, the traction tensioning component is controlled to enter the working state. S2, Pressing Traction: The control torque motor drives the upper roller and / or lower roller to apply traction force to the waste section of the material belt to keep the material belt taut, and sets the upper limit of the torque output of the torque motor based on the pressing force threshold of the feeder to limit the traction force to be less than the pressing force of the feeder; S3, Positioning Measurement: The positioning hole / position status of the material belt is detected by fiber optic sensor. When an abnormality is detected, an interlock signal is output and a stop or prohibition action is executed. S4. Fixed-length cutting: During the traction and tensioning process, the fixed-length cutting component is triggered to cut the waste section of the material strip according to the set length, and the cut waste is collected in the waste funnel through the conveying channel.

[0018] In one embodiment, setting the upper limit of the torque output of the torque motor includes: mapping the pressing force threshold of the feeder to the maximum allowable traction force, and converting the maximum allowable traction force into the maximum allowable output torque of the torque motor according to the roller radius of the output traction force.

[0019] The beneficial effects of this invention are as follows: (1) The waste material tensioning function is integrated with the stamping machine tool, which significantly reduces the space occupation and improves safety. This technical solution sets the waste material tensioning strip cutting machine to be installed on the frame of the stamping machine tool and adjacent to the tail end of the stamping die. It achieves the same layout as the stamping machine tool through the bracket, replacing the existing external floor-mounted winding machine solution. This avoids the safety hazards caused by large winding equipment occupying production space and exposed transmission components, and improves the compactness and inherent safety level of the stamping production line from the structural layout.

[0020] (2) The problem of mismatch between winding tension and feeder pressing force is solved by using torque limiting traction, thus reducing the difficulty of control. This technical solution uses a torque motor-driven traction tensioning assembly to apply traction force to the waste section of the conveyor belt. The torque output torque of the torque motor is set by the control unit, so that the traction force is limited to less than the feeder's pressing force threshold. This allows the conveyor belt to remain taut even during the feeder's slack feeding phase, while avoiding excessive pulling, feeding misalignment, or pitch disorder caused by excessive traction force. This significantly reduces the difficulty of controlling the precise matching of traction and feeding.

[0021] (3) Introduce a positioning hole detection and interlocking control mechanism to effectively prevent misaligned stamping and die risks. By installing fiber optic sensors at the positioning plate to detect the positioning hole / position status of the strip, and inputting the detection results as an interlock signal into the control unit, traction is stopped, cutting is prohibited, or the machine is stopped in time when a positioning abnormality occurs. This proactive intervention before stamping abnormalities occur improves the reliability of the stamping process and the safety of the mold.

[0022] (4) To achieve the integration of traction, fixed-length cutting and waste collection, thereby improving automation and waste treatment efficiency. This technical solution sets up a fixed-length cutting component downstream of the traction tensioning component, and works in conjunction with a conveying channel and a waste hopper, so that the waste section of the material strip can be cut to a set length and collected in a centralized manner while being traction tensioned. This avoids the problem of the separation of waste cutting and collection functions and the need for manual intervention in the existing technology, which is conducive to improving the automation level and cleanliness of the stamping production line.

[0023] (5) Improve the adaptability of the device to different molds by adjusting the height structure. By setting up a height adjustment component, the traction tensioning component and / or fixed-length cutting component can be adjusted relative to the exit height of the stamping die, thereby ensuring that the running plane of the scrap section is flush with the die exit, adapting to different die heights or structural differences, and improving the versatility of the device and the flexibility of technical integration applications.

[0024] In summary, this technical solution systematically solves the problems of large size, low safety, high difficulty in traction control, and low degree of automation in waste cutting and collection of existing winding machines through synergistic improvements in structural layout, traction control, safety interlocking, and waste disposal methods, demonstrating significant technological progress. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the assembly structure of the waste material tensioning strip cutting machine and the stamping machine frame of the present invention; Figure 2 This is a front view structural schematic diagram of the waste material tensioning strip cutting machine of the present invention; Figure 3 This is a side view of the waste material tensioning strip cutting machine of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the traction tensioning component of the present invention; Figure 5 This is an isometric structural schematic diagram of the traction tensioning assembly of the present invention; Figure 6 This is a schematic diagram of the process steps of the waste material tensioning strip cutting control method of the present invention.

[0027] The reference numerals in the attached figures are as follows: 00. Waste material tensioning strip cutting machine; 1. Bracket; 2. Traction tensioning assembly; 21. Upper roller; 22. Lower roller; 23. Torque motor; 24. Pressure force adjustment mechanism; 25. Adjustment unit; 251. Transmission assembly; 252. Transmission cylinder; 26. Locking unit; 261. Adjusting wheel; 262. Locking nut; 27. Elastic preload component; 28. Limiting component; 281. Scale component; 29. ​​Frame; 3. Anti-misalignment detection component; 31. Positioning plate; 32. Fiber optic sensor; 4. Fixed-length cutting assembly; 41. Cutting blade; 42. Drive mechanism; 43. Buffer rod; 5. Waste collection assembly; 51. Conveying channel; 52. Waste funnel; 6. Height adjustment assembly; 61. Synchronous lifting mechanism; 62. Guide rod; 621. Guide bearing; 63. Transmission screw; 631. Transmission nut; 632. Handwheel; 64. Fixed base; 65. Sliding base; 66. Synchronization assembly; 661. Synchronous belt; 662. Synchronous pulley; 663. Preload pulley; 67. Height gauge; 68. Locking mechanism; 681. Quick-lock wrench; 7. Control unit; 71. PLC controller; 72. Human-machine interface terminal; 8. Feed belt; 81. Displacement sensor; 9. Stamping machine frame. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0029] A specific embodiment provides a sheet metal stamping scrap tensioning strip cutting machine and cutting control method, including a bracket, a traction tensioning assembly, an anti-misalignment detection assembly, a fixed-length cutting assembly, a scrap collection assembly, a height adjustment assembly, and a control unit, which are installed on the stamping machine frame and adjacent to the tail end of the stamping die; the traction tensioning assembly uses a torque motor to drive rollers to apply a limited traction force to the scrap section of the strip to maintain tension, and the traction force is limited to less than the pressing force threshold of the feeder; the anti-misalignment detection assembly detects the positioning hole / position status of the strip through a fiber optic sensor and outputs an interlocking signal; the fixed-length cutting assembly... The cutting component cuts the waste section to a fixed length during the traction process, and the cut waste is collected through a conveying channel and a waste hopper. The height adjustment component is used to keep the running plane of the waste section flush with the mold exit. The cutting machine has a compact structure and is integrated into the stamping machine to achieve high safety. It also reduces the difficulty of traction control and improves the automation level of waste handling. It effectively solves the technical problems in the existing stamping production where the winding machine only has a winding function, which is large in size and has low safety. The winding tension and the pressing force of the feeder need to be precisely matched, which is difficult to control. In addition, the waste cutting and collection functions are separated, resulting in low automation.

[0030] The first implementation of the waste tension strip cutting machine, for example Figures 1 to 5As shown, the assembly includes a bracket 1, mounted on the frame 9 of the stamping machine and adjacent to the tail end of the stamping die; a traction tensioning assembly 2, mounted on the bracket 1, including an upper roller 21, a lower roller 22, and a torque motor 23. The torque motor 23 drives the upper roller 21 and / or the lower roller 22 to rotate to apply traction force to the scrap section of the strip 8, keeping the strip 8 taut. The output torque of the torque motor 23 is adjustable to limit the traction force to be less than the pressing force threshold of the feeder of the stamping machine; an anti-misalignment detection assembly 3, including a positioning plate 31 and a fiber optic sensor 32 mounted on the positioning plate 31, for detecting the positioning hole / position status of the strip 8 and outputting an interlocking signal; and a fixed-length cutting assembly 4, mounted on the traction... Downstream of the tensioning assembly 2, it is used to cut the waste section of the strip 8 to a set length during the traction tensioning process; and the waste collection assembly 5, including a conveying channel 51 and a waste funnel 52 corresponding to the fixed-length cutting assembly 4, for receiving and collecting the cut waste; and the height adjustment assembly 6, for adjusting the exit height position of the traction tensioning assembly 2 and / or the fixed-length cutting assembly 4 relative to the stamping die, so that the running plane of the waste section of the strip 8 is flush with the exit of the stamping die; and the control unit 7, electrically connected to the torque motor 23, the fiber optic sensor 32 and the fixed-length cutting assembly 4, for performing coordinated control of traction tensioning and fixed-length cutting according to the interlocking signal, the pressing force threshold and the set length parameters.

[0031] Specifically, addressing the technical problems in existing stamping production where winding machines only have winding functions, resulting in large size, low safety, the need for precise matching between winding tension and feeding machine pressing force, high control difficulty, and the separation of waste cutting and collection functions with low automation, a waste tensioning strip cutting machine 00 that can be integrated into a stamping machine tool was designed. This design offers several technical advantages: it achieves integrated waste tensioning function with the stamping machine tool, significantly reducing space occupation and improving safety; the waste tensioning strip cutting machine 00 is mounted on the stamping machine tool frame 9 and adjacent to the tail end of the stamping die, achieving an integrated arrangement with the stamping machine tool via a bracket 1, replacing the existing external floor-mounted winding machine solution. This avoids the safety hazards caused by large winding equipment occupying production space and exposed transmission components, improving the compactness and inherent safety level of the stamping production line from a structural layout perspective.

[0032] The problem of mismatch between winding tension and feeder pressing force is solved by using a torque-limiting traction method, reducing control difficulty. This technical solution uses a torque motor 23 to drive a traction tensioning assembly 2 to apply traction force to the waste section of the material belt 8, and sets the output torque of the torque motor 23 through the control unit 7, so that the traction force is limited to less than the feeder pressing force threshold. This allows the material belt 8 to remain taut even during the feeder's slack feeding phase, while avoiding excessive winding, feeding misalignment, or pitch disorder caused by excessive traction force, significantly reducing the difficulty of precise matching between traction and feeding.

[0033] The introduction of a positioning hole detection and interlock control mechanism effectively prevents misaligned stamping and die risks. By setting an optical fiber sensor 32 at the positioning plate 31 to detect the positioning hole / position status of the strip 8, and inputting the detection result as an interlock signal into the control unit 7, the traction is stopped in time, cutting is prohibited or the machine is stopped in an interlock when a positioning abnormality occurs. This proactive intervention before stamping abnormalities occur improves the reliability of the stamping process and the safety of the die.

[0034] This solution integrates traction, fixed-length cutting, and waste collection, improving automation and waste handling efficiency. A fixed-length cutting component 4 is installed downstream of the traction tensioning component 2, along with a conveying channel 51 and a waste funnel 52. This allows the waste section of the material belt 8 to be cut to a set length and collected simultaneously while being traction-tensioned, avoiding the problem of separate waste cutting and collection functions requiring manual intervention in existing technologies. This improves the automation level and cleanliness of the stamping production line.

[0035] The height adjustment structure enhances the device's adaptability to different molds. By setting the height adjustment component 6, the traction tensioning component 2 and / or the fixed-length cutting component 4 can be adjusted relative to the exit height of the stamping die, thereby ensuring that the running plane of the scrap section remains flush with the mold exit, adapting to different mold heights or structural differences, and improving the device's versatility and the flexibility of its integrated technology applications.

[0036] In summary, this technical solution systematically solves the problems of large size, low safety, high difficulty in traction control, and low degree of automation in waste cutting and collection of existing winding machines through synergistic improvements in structural layout, traction control, safety interlocking, and waste disposal methods, demonstrating significant technological progress.

[0037] As one alternative implementation method: Regarding the specific structure of the aforementioned traction tensioning assembly 2, this embodiment is as follows: Figure 1 and Figure 4 As shown, the traction tensioning assembly 2 also includes a clamping force adjustment mechanism 24, which is used to adjust the clamping pressure of the upper roller 21 and the lower roller 22 on the waste section of the material belt 8; the clamping force adjustment mechanism 24 includes an adjustment unit 25 and a locking unit 26. The adjustment unit 25 is a screw adjustment structure and / or an eccentric shaft adjustment structure to change the rolling gap or relative position of the upper roller 21 and the lower roller 22. The locking unit 26 is used to lock the rolling gap or relative position after adjusting the upper roller 21 and the lower roller 22.

[0038] In application, the clamping pressure between the upper roller 21 and the lower roller 22 is adjustable by setting the clamping force adjustment mechanism 24, so that the traction tensioning assembly 2 can match the clamping force according to the thickness, material and surface friction characteristics of the waste section of the material belt 8. When performing traction tensioning operation, the rolling gap or relative position of the upper roller 21 and the lower roller 22 is changed by the adjustment unit 25 so that the two rollers form a stable clamp on the waste section. Then, the locking unit 26 locks the adjusted state, thereby avoiding changes in the roller gap due to vibration, impact or long-term operation during traction.

[0039] This structure works in conjunction with the torque limiting traction method of the torque motor 23 to form a synergistic constraint relationship between the clamping force and the traction force. This ensures the reliability of friction transmission during the traction process and avoids damage to the surface of the material belt 8 or increased running resistance due to excessive clamping force, thereby improving the traction stability of the waste section and reducing the risk of operational failure.

[0040] In addition to using a screw adjustment structure or an eccentric shaft adjustment structure, the adjustment unit 25 can also use a wedge adjustment, a connecting rod adjustment, or an electric fine-tuning structure; the locking unit 26 can use a locking nut 262, a wedge locking block, or a quick-release locking component to adapt to different on-site operating habits or automation requirements.

[0041] Regarding the specific structure of the aforementioned clamping force adjusting mechanism 24, this embodiment is, for example... Figure 4 As shown, the clamping force adjustment mechanism 24 also includes an elastic preload member 27 and a limiting member 28. The elastic preload member 27 is a spring or elastic body, used to apply preload to the upper roller 21 and / or the lower roller 22 to compensate for the thickness fluctuation of the material strip 8. The limiting member 28 is used to limit the maximum clamping pressure and / or the minimum rolling gap, and is equipped with a scale member 281 to realize the visual setting of the clamping pressure or rolling gap.

[0042] The clamping pressure can also be measured by setting a pressure sensor, which is electrically connected to the control unit 7, to obtain the clamping pressure parameters of the feeder.

[0043] When applied, by setting an elastic preload 27 in the clamping force adjustment mechanism 24, the upper roller 21 and / or the lower roller 22 always maintain a certain elastic compensation capacity when clamping the waste section. When there are slight fluctuations in the thickness of the waste section or instantaneous impacts occur during operation, the elastic preload 27 can automatically absorb displacement changes and maintain the continuity of clamping force, avoiding fluctuations in traction force or slippage caused by rigid clamping.

[0044] Meanwhile, the maximum clamping pressure or minimum rolling gap is limited by the limiting component 28 to prevent over-adjustment from causing structural damage or crushing of the waste section. The scale component 281 allows the operator to intuitively read the current clamping pressure or rolling gap parameters and establish a correspondence with different molds or strip 8 specifications, thereby achieving repeatable and recordable process settings. This structure works synergistically with the traction tensioning assembly 2 to effectively improve the equipment's adaptability to different waste section conditions and operational consistency.

[0045] The elastic preload 27 can be a compression spring, a tension spring, a disc spring, or a rubber elastomer; the scale 281 can be a scale, a scale ring, or a digital display module to meet different accuracy and visualization requirements.

[0046] Regarding the specific structure of the aforementioned height adjustment component 6, this embodiment is, for example... Figure 2 , Figure 3 and Figure 4 As shown, the height adjustment component 6 includes a synchronous lifting mechanism 61, which keeps the relative positions of the traction tensioning component 2 and the fixed-length cutting component 4 unchanged during the height adjustment process.

[0047] The synchronous lifting mechanism 61 includes multiple guide rods 62 and guide bearings 621, two drive screws 63, two drive nuts 631, two fixed seats 64 and a sliding seat 65, and a synchronous assembly 66. The two ends of the multiple guide rods 62 are respectively connected and fixed to the two fixed seats 64. The guide bearings 621 are slidably sleeved on the outside of the guide rods 62 and connected to the sliding seat 65. The drive nuts 631 are connected and fixed to the opposite sides of the sliding seat 65. The drive screws 63 are drively sleeved inside the drive nuts 631, and the two ends of the drive screws 63 are rotatably connected to the two fixed seats 64. The synchronous assembly 66 is connected to the sliding seat 65 and the lower vertical section. On the two transmission screws 63 between the fixed base 64, the ends of the two transmission screws 63 extending out of the upper fixed base 64 are connected to handwheels 632. Rotating any one of the handwheels 632 drives one of the transmission screws 63, and synchronously drives the other transmission screw 63 through the synchronization component 66. This is used to synchronously adjust the lifting and lowering of both sides of the sliding base 65, so as to realize the lifting and lowering balance of the various components on the sliding base 65. The lower fixed base 64 is connected and fixed to the bracket 1. The sliding base 65 is equipped with a traction tensioning component 2, a fixed length cutting component 4, an anti-misalignment detection component 3, and a conveying channel 51. The upper fixed base 64 is equipped with a control unit 7.

[0048] When applied, the overall height of the traction tensioning assembly 2 and the fixed-length cutting assembly 4 is adjusted by the synchronous lifting mechanism 61 so that the running plane of the scrap section can be kept flush with the exit of the stamping die, thereby avoiding bending, sagging or additional tension of the scrap section due to height misalignment after leaving the die.

[0049] Multiple guide rods 62 and guide bearings 621 form a stable guide support structure. Two transmission screws 63 are linked by a synchronization component 66, ensuring that the sliding seat 65 remains synchronized on both sides during lifting and lowering, preventing tilting of the component due to unilateral lifting and lowering, which would affect traction and cutting accuracy. The height adjustment structure, traction tensioning component 2, fixed-length cutting component 4, and anti-misalignment detection component 3 work together as a whole, enabling the equipment to adapt to different heights or structures of stamping dies without readjusting the relative positions of each unit, thereby improving die-changing efficiency and operational reliability.

[0050] In addition to the synchronous belt 661 structure, the synchronous component 66 can also adopt a synchronous sprocket mechanism, a gear linkage mechanism or a coupling shaft system structure; the transmission screw 63 can be a trapezoidal screw, a ball screw or a self-locking screw to adapt to different load-bearing capacity and adjustment accuracy requirements.

[0051] The height adjustment component 6 also includes a height scale 67 and a locking mechanism 68, which are used to realize the visual reading of the height position and lock it in place; the two locking mechanisms 68 are connected to the sliding seat 65 and respectively sleeved on the two transmission screws 63, and the position of the sliding seat 65 on the transmission screws 63 is locked by the rotation of the screw and the quick-locking wrench 681.

[0052] When applied, by setting a height scale 67 in the height adjustment component 6, the operator can obtain the height position of the sliding seat 65 and its mounted components in real time during the lifting and adjusting process. After the adjustment is completed, the position of the sliding seat 65 on the transmission screw 63 is locked by the locking mechanism 68, thereby preventing the equipment from drifting in height under operating vibration or long-term load.

[0053] The locking mechanisms 68 set on both sides can symmetrically lock the sliding seat 65 on both sides, and work together with the synchronous lifting structure to further improve the stability and repeatability of the overall structure, and ensure the consistency of traction tensioning and fixed-length cutting in long-term operation.

[0054] The locking mechanism 68 can be a nut locking, eccentric clamping, hydraulic locking or pneumatic locking structure; the height scale 67 can be a mechanical scale, magnetic scale or electronic display scale.

[0055] Regarding the specific composition of the aforementioned control unit 7, this embodiment is as follows: Figure 1 and Figure 2 As shown, the control unit 7 includes a PLC controller 71 and a human-machine interface terminal 72, which are used to set the upper limit of the output torque of the torque motor 23 and the set length of the waste section of the cutting strip 8 of the fixed-length cutting component 4.

[0056] When applied, the upper limit of the output torque of the torque motor 23 and the fixed-length cutting parameters are set through the PLC controller 71 and the human-machine interface terminal 72, so that the operator can centrally configure the equipment operation status according to the process conditions such as the pressing force of the feeder, the material of the strip 8 and the mold pitch.

[0057] In actual operation, the control unit 7 schedules the traction tensioning assembly 2 and the fixed-length cutting assembly 4 in a unified manner according to the set parameters, so as to realize the coordinated execution of traction, detection and cutting actions, thereby reducing the intensity of manual intervention and improving the accuracy and repeatability of parameter adjustment.

[0058] The human-machine interface can store multiple sets of process parameters to support rapid switching between different molds or products; the control unit 7 can also communicate with the stamping machine or feeder to achieve linkage of operating status.

[0059] Regarding the specific logic of the control unit 7 for controlling the position offset of the conveyor belt 8, this implementation is as follows: Figure 3 and Figure 4 As shown, the control unit 7 is configured to perform at least one of the following actions when the fiber optic sensor 32 detects that the positioning hole is misaligned or the position offset exceeds a preset threshold: stop the torque motor 23, prohibit the operation of the fixed length cutting component 4, and output a stop or pause interlock signal to the stamping machine and / or feeder to prevent the stamping die from producing a pressed die or misaligned stamping.

[0060] In application, when the fiber optic sensor 32 detects that the positioning hole of the waste section is misaligned or the positional deviation exceeds a preset threshold, the control unit 7 executes interlocking control logic based on the detection signal. This involves at least one or more measures, such as stopping traction, prohibiting cutting, or issuing a stop or pause signal to the stamping machine and feeder. This proactively intervenes in the system before misaligned stamping or die-cutting risks occur. By forming a closed-loop control system with the detection and interlocking mechanism and the traction tensioning and fixed-length cutting processes, the safety and stability of the stamping production process are effectively improved.

[0061] The preset threshold can be set according to the mold precision requirements; the interlock control strategy can select different response levels according to the production cycle.

[0062] Regarding the specific structure of the aforementioned fixed-length cutting component 4, this embodiment is, for example... Figure 2As shown, the fixed-length cutting assembly 4 includes a cutting blade 41 and a drive mechanism 42; the control unit 7 triggers the set length parameter by counting the conveying length of the material belt 8, causing the drive mechanism 42 to operate to achieve periodic fixed-length cutting, and the conveying length counting satisfies one or a combination of the following methods: a rotary encoder is set at the shaft end of the upper roller 21 or lower roller 22 of the traction tensioning assembly 2, and the conveying length is calculated by counting the pulses of the rotary encoder; the positioning holes of the material belt 8 are counted based on the fiber optic sensor 32 and the conveying length is calculated by combining the hole spacing parameter; a displacement sensor 81 is set on the conveying path of the material belt 8, and the conveying length of the material belt 8 is directly measured by the displacement sensor 81.

[0063] In application, the length of the waste material conveying segment is counted in real time, and the cutting blade 41 is triggered when the set length parameter is reached to achieve periodic fixed-length cutting of the waste material segment. The length count can be obtained through rotary encoders, positioning hole counting, or displacement sensors 81, and is processed uniformly by the control unit 7 to keep the cutting action synchronized with the traction and tensioning process. The fixed-length cutting component 4 works in conjunction with the conveying channel 51 and the waste funnel 52 to ensure that the waste material is guided to the collection area in an orderly manner after cutting, avoiding flying material or accumulation and improving waste processing efficiency.

[0064] Optionally, different length counting methods can be combined according to the structure and accuracy requirements of the strip 8; the cutting blade 41 can adopt a straight cutting, oblique cutting or reciprocating cutting structure.

[0065] The second implementation of the waste material tensioning strip cutting machine is as follows: Figure 4 and Figure 5 As shown, the difference between this embodiment and the first embodiment is that both the adjustment unit 25 and the locking unit 26 are mounted on the frame 29 of the traction tensioning assembly 2.

[0066] The adjustment unit 25 includes a transmission assembly 251 with a lead screw adjustment structure. The transmission assembly 251 is connected to the upper roller 21 and / or the lower roller 22. A transmission cylinder 252 is provided. The telescopic end of the transmission cylinder 252 is connected to the adjustment lead screw of the transmission assembly 251 to drive the lead screw to rotate and drive the upper roller 21 and / or the lower roller 22 to move relative to each other to apply clamping pressure to the waste section of the material belt 8.

[0067] The locking unit 26 is used to lock the rolling gap or relative position after adjusting the upper roller 21 and the lower roller 22. The locking unit 26 includes an adjusting wheel 261 and a locking nut 262. The end of the adjusting screw extends out of the top plate of the frame 29 and connects to the adjusting wheel 261. The locking nut 262 is sleeved on the adjusting screw and is located between the adjusting wheel 261 and the top plate of the frame 29. The adjusting screw is locked by rotating the adjusting wheel 261 and the locking nut 262 at the same time.

[0068] In application, a transmission cylinder 252 is installed on the frame 29 of the traction tensioning assembly 2. The extension and retraction of the transmission cylinder 252 drives the lead screw adjustment structure to rotate, thereby automatically adjusting the relative position of the upper roller 21 and / or the lower roller 22 and applying clamping pressure, achieving semi-automatic or automatic adjustment of the traction clamping force. After adjustment, the adjustment state is locked by the locking unit 26 to ensure the stability of the traction process. This adjustment method works in conjunction with the control unit 7, which helps to reduce the number of manual adjustments and is suitable for production scenarios where the specifications of the conveyor belt 8 are frequently changed.

[0069] The transmission cylinder 252 can be replaced with an electric push rod or a servo actuator to improve adjustment accuracy.

[0070] The third implementation of the waste tension strip cutting machine is as follows: Figure 2 As shown, the difference between this embodiment and the first embodiment is that the drive mechanism 42 is a telescopic cylinder, and the telescopic end of the telescopic cylinder is connected to the cutting blade 41. Both sides of the telescopic cylinder are equipped with buffer rods 43, and the telescopic ends of the buffer rods 43 make buffer contact with the back of the cutting blade 41.

[0071] In application, a telescopic cylinder is used as the drive mechanism 42 of the cutting blade 41, giving the cutting action a fast response and simple structure. Buffer rods 43 are installed on both sides of the cutting blade 41, allowing the blade to absorb impact energy through buffer contact when the action ends, reducing the impact load between the blade and structural components, thereby extending the service life of the cutting mechanism. This structure works in conjunction with the fixed-length cutting control logic to ensure smooth and reliable cutting action.

[0072] The buffer rod 43 can be a spring buffer or a hydraulic buffer structure.

[0073] The fourth implementation of the waste stretching strip cutting machine, for example Figure 2 and Figure 3 As shown, the difference between this embodiment and the first embodiment is that the synchronization component 66 includes a timing belt 661, two timing pulleys 662 and a preload pulley 663; the two timing pulleys 662 are respectively sleeved on the transmission screw 63; the timing belt 661 drives the two timing pulleys 662; the preload pulley 663 is suspended on the sliding seat 65 and pressed against the timing belt 661.

[0074] In application, a synchronization assembly 66 is formed by a synchronous belt 661, a synchronous pulley 662, and a preload pulley 663. This assembly ensures that the two transmission screws 63 maintain strict synchronization during lifting and lowering adjustments. The preload pulley 663 applies tension to the synchronous belt 661 to eliminate transmission backlash, thereby improving the stability and accuracy of synchronous lifting and lowering. This synchronization assembly 66 works in conjunction with the guide rod 62 and the sliding seat 65 to ensure the stability of the traction tensioning assembly 2 and the fixed-length cutting assembly 4 during lifting and lowering.

[0075] In addition, the timing belt 661 can be replaced with a timing chain or a toothed belt; the preload pulley 663 can be configured as an elastic preload or an adjustable preload structure.

[0076] Based on the above embodiments of the waste material tensioning strip cutting machine, a method for controlling the cutting of waste material tensioning strip in sheet metal stamping is provided. This method is applied to the waste material tensioning strip cutting machine and includes the following steps, executed sequentially from S1 to S4: Figure 6 As shown, S1. Traction Start: When the stamping machine starts stamping and / or the feeder starts feeding, the traction tensioning component is controlled to enter the working state. S2, Pressing Traction: The control torque motor drives the upper roller and / or lower roller to apply traction force to the waste section of the material belt to keep the material belt taut, and sets the upper limit of the torque output of the torque motor based on the pressing force threshold of the feeder to limit the traction force to be less than the pressing force of the feeder; S3, Positioning Measurement: The positioning hole / position status of the material belt is detected by fiber optic sensor. When an abnormality is detected, an interlock signal is output and a stop or prohibition action is executed. S4. Fixed-length cutting: During the traction and tensioning process, the fixed-length cutting component is triggered to cut the waste section of the material strip according to the set length, and the cut waste is collected in the waste funnel through the conveying channel.

[0077] Specifically, setting the upper limit of the torque output of the torque motor in S2 includes: mapping the pressing force threshold of the feeder to the maximum allowable traction force, and converting the maximum allowable traction force into the maximum allowable output torque of the torque motor based on the roller radius of the output traction force.

[0078] In application, the traction tensioning component is triggered to enter working state simultaneously when the stamping machine starts and / or the feeding machine starts feeding. This ensures that the scrap section of the strip is under controlled traction after leaving the stamping die, thus preventing the scrap section from sagging or loosening freely. When performing the pressing and traction step, the control unit sets the upper limit of the output torque of the torque motor based on the pressing force threshold of the feeding machine. This ensures that the traction force applied to the scrap section by the traction tensioning component is always less than the pressing force of the feeding machine. From a control strategy perspective, an asymmetric cooperative relationship of "feeding as the main component and traction as the auxiliary component" is formed, which not only ensures the stability of the feeding pitch but also avoids misalignment or pitch disorder caused by excessive traction.

[0079] The pressing force of the feeder is obtained by setting a pressure sensor, which is electrically connected to the control unit.

[0080] During the traction and tensioning process, fiber optic sensors monitor the positioning holes / position status of the material strip in real time. Upon detecting an anomaly, an interlock signal is output, enabling the control unit to promptly stop traction, prohibit cutting, or interlock shutdown, thus proactively intervening before misaligned stamping or die-cutting risks occur. Simultaneously, the control unit counts the conveying length of the waste section during traction. When a set length parameter is reached, the fixed-length cutting component is triggered to perform periodic fixed-length cutting of the waste section. The cut waste is then guided through a conveying channel to a waste funnel for centralized collection.

[0081] Through the coordinated execution of the above steps, the scrap section is kept in a closed-loop control state of "controlled traction - position monitoring - fixed length cutting - orderly collection" throughout the entire stamping process. This effectively solves the problems of difficulty in matching the winding tension and feeding pressure, separation of scrap cutting and collection, and low degree of automation in the existing technology. At the same time, it reduces the dependence on manual intervention and experience adjustment, and improves the stability, safety and automation level of stamping production.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A sheet metal stamping waste stretching strip cutting machine, characterized in that, Includes a bracket, which is designed to be mounted on the frame of a stamping machine and adjacent to the tail end of the stamping die; And a traction tensioning assembly, provided on the bracket, including an upper roller, a lower roller and a torque motor, wherein the torque motor drives the upper roller and / or the lower roller to rotate to apply traction force to the waste section of the material belt to keep the material belt taut, and the output torque of the torque motor is adjustable to limit the traction force to be less than the pressing force threshold of the feeder of the stamping machine tool; And an anti-misalignment detection component, including a positioning plate and an optical fiber sensor disposed on the positioning plate, for detecting the positioning hole / position status of the material strip and outputting an interlocking signal; And a fixed-length cutting component, located downstream of the traction and tensioning component, for cutting the waste section of the material strip to a set length during the traction and tensioning process; And a waste collection component, including a conveying channel and a waste funnel corresponding to the fixed-length cutting component, for receiving and collecting the cut waste; And a height adjustment component for adjusting the exit height position of the traction tensioning component and / or the fixed-length cutting component relative to the stamping die, so that the running plane of the scrap section of the strip is flush with the exit of the stamping die; The control unit is electrically connected to the torque motor, the fiber optic sensor, and the fixed-length cutting assembly, and is used to perform coordinated control of traction tensioning and fixed-length cutting based on the interlocking signal, the pressing force threshold, and the parameters of the set length.

2. The waste material tensioning strip cutting machine according to claim 1, characterized in that, The traction tensioning assembly also includes a clamping force adjustment mechanism for adjusting the clamping pressure of the upper roller and the lower roller on the waste section of the material belt; The clamping force adjustment mechanism includes an adjustment unit and a locking unit. The adjustment unit is a screw adjustment structure and / or an eccentric shaft adjustment structure to change the rolling gap or relative position of the upper roller and the lower roller. The locking unit is used to lock the rolling gap or relative position after adjusting the upper roller and the lower roller.

3. The waste material tensioning strip cutting machine according to claim 2, characterized in that, The clamping force adjustment mechanism also includes an elastic pre-tensioning component and a limiting component. The elastic pre-tensioning component is a spring or an elastic body, used to apply pre-pressure to the upper roller and / or the lower roller to compensate for the thickness fluctuation of the material strip. The limiting member is used to limit the maximum clamping pressure and / or the minimum rolling gap, and is equipped with a scale to realize the visual setting of the clamping pressure or the rolling gap.

4. The waste material tensioning strip cutting machine according to claim 1, characterized in that, The height adjustment component includes a synchronous lifting mechanism, which keeps the relative positions of the traction tensioning component and the fixed-length cutting component unchanged during the height adjustment process; The synchronous lifting mechanism includes multiple guide rods and guide bearings, two transmission screws, two transmission nuts, two fixed seats and a sliding seat, and a synchronous assembly; The two ends of the multiple guide rods are respectively connected and fixed to the two fixed seats. The guide bearing is slidably sleeved on the outside of the guide rod and connected to the sliding seat. The transmission nut is connected and fixed to the opposite sides of the sliding seat. The transmission screw is driven and sleeved in the transmission nut, and the two ends of the transmission screw are respectively rotatably connected to the two fixed seats. The synchronization component is connected to two transmission screws between the sliding seat and the fixed seat at the lower vertical position. The ends of the two transmission screws extending out of the fixed seat at the upper position are connected to handwheels. Rotating any one of the handwheels drives one of the transmission screws, and the synchronization component drives the other transmission screw synchronously. This is used to synchronously adjust the lifting and lowering of both sides of the sliding seat, so as to achieve the lifting and lowering balance of the components on the sliding seat. The lower fixed seat is connected and fixed to the bracket. The sliding seat is equipped with the traction tensioning component, the fixed length cutting component, the anti-misalignment detection component and the conveying channel. The upper fixed seat is equipped with the control unit.

5. The waste material tensioning strip cutting machine according to claim 4, characterized in that, The height adjustment component also includes a height scale and a locking mechanism for visual reading and locking of the height position; The two locking mechanisms are connected to the sliding seat and respectively sleeved on the two transmission screws, and the position of the sliding seat on the transmission screw is locked by the rotation of the screw and the quick-locking wrench.

6. The waste material tensioning strip cutting machine according to claim 1, characterized in that, The control unit includes a PLC controller and a human-machine interface terminal, used to set the upper limit of the output torque of the torque motor and the set length of the waste segment of the material strip cut by the fixed-length cutting component.

7. The waste material tensioning strip cutting machine according to claim 1, characterized in that, The control unit is configured to perform at least one of the following actions when the fiber optic sensor detects that the positioning hole is misaligned or the position offset exceeds a preset threshold: stop the torque motor, prohibit the operation of the fixed-length cutting component, and output a stop or pause interlock signal to the stamping machine and / or the feeder to prevent the stamping die from producing a pressed die or misaligned stamping.

8. The waste material tensioning strip cutting machine according to claim 1, characterized in that, The fixed-length cutting assembly includes a cutting blade and a driving mechanism; the control unit triggers the set length parameter by counting the conveying length of the material strip, causing the driving mechanism to operate to achieve periodic fixed-length cutting, and the conveying length counting satisfies one or a combination of the following: A rotary encoder is installed at the shaft end of the upper or lower roller of the traction tensioning assembly, and the conveying length is calculated by counting the pulses of the rotary encoder. The fiber optic sensor counts the positioning holes of the material strip and calculates the conveying length based on the hole spacing parameter. A displacement sensor is installed on the conveying path of the material belt to directly measure the conveying length of the material belt.

9. A method for controlling the cutting of waste tensioned strips in sheet metal stamping, applied to the waste tensioned strip cutting machine according to any one of claims 1-8, characterized in that, Includes the following steps, S1. Traction Start: When the stamping machine starts stamping and / or the feeder starts feeding, the traction tensioning component is controlled to enter the working state. S2, Pressing Traction: The control torque motor drives the upper roller and / or lower roller to apply traction force to the waste section of the material belt to keep the material belt taut, and sets the upper limit of the torque output of the torque motor based on the pressing force threshold of the feeder to limit the traction force to be less than the pressing force of the feeder; S3, Positioning Measurement: The positioning hole / position status of the material belt is detected by fiber optic sensor. When an abnormality is detected, an interlock signal is output and a stop or prohibition action is executed. S4. Fixed-length cutting: During the traction and tensioning process, the fixed-length cutting component is triggered to cut the waste section of the material strip according to the set length, and the cut waste is collected in the waste funnel through the conveying channel.

10. The waste material tensioning strip cutting control method according to claim 9, characterized in that, The upper limit of the set torque motor output torque includes: mapping the pressing force threshold of the feeder to the maximum allowable traction force, and converting the maximum allowable traction force into the maximum allowable output torque of the torque motor according to the roller radius of the output traction force.

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