A bending center front feeding device

Abstract

This invention provides a front feeding device for a bending center, primarily relating to the field of bending machine tool technology. The device includes a base and a feeding platform slidably mounted on top of the base. The feeding platform has a U-shaped structure. The base contains a linear displacement component that pushes the feeding platform along its length. A clamping rotation component is located on one side of the feeding platform, and a pressure sensor is located at the bottom of the clamping rotation component. The feeding platform also contains a pushing component and a thickness detection component. The advantages of this invention are: by using the mutual compensation and synergistic effect of the thickness detection component and the pressure sensor, this device achieves precise control of the clamping pressure on plates of different thicknesses, ensuring stable clamping of the plate while avoiding excessive clamping force that could damage the plate, thus improving the quality of plate bending.

Description

Technical Field

[0001] This invention mainly relates to the field of bending machine tool technology, specifically a front feeding device for bending centers. Background Technology

[0002] A bending center is a device for bending thin metal sheets. Typically, the sheet is manually fed to a front feeding device, which, in conjunction with the main unit, performs the bending action. The feeding and clamping of the sheet before bending are crucial for ensuring bending accuracy. Currently, most mainstream bending center front feeding devices rely on a "lifting stroke control clamping force" technology: by pre-setting the lifting stroke of the clamping mechanism (such as upper and lower clamping parts), the clamping force on the sheet is indirectly controlled by the displacement of the mechanical structure. That is, by setting a fixed distance for the clamping parts to descend, the clamping parts come into contact with the sheet and generate extrusion force, thereby fixing the sheet.

[0003] Chinese patent application CN 114160691 B discloses a front feeding device for a bending center, including a fixed base, a C-shaped pressure arm drive device, a C-shaped pressure arm, a rotary positioning mechanism, an auxiliary feeding robot, a front-end positioning component for the sheet metal, a left-side positioning component for the sheet metal, a right-side auxiliary pushing component for the sheet metal, a rear-side auxiliary pushing component for the sheet metal, and an loading / unloading platform. This front feeding device for a bending center utilizes a comprehensive sheet metal positioning method, with positioning blocks at the front and left ends of the sheet metal, and auxiliary pushing mechanisms at the right and rear ends. This results in more accurate workpiece positioning and avoids deviations caused by manual loading. Furthermore, for certain irregularly shaped workpieces, the cooperation between the various positioning mechanisms enables automatic secondary positioning of the workpiece, expanding the processing range and thus improving equipment utilization.

[0004] However, this bending center feeding device has the following drawbacks in practical use:

[0005] On the one hand, the clamping force depends entirely on the accuracy of the lifting stroke. However, in actual applications, factors such as the tolerance of the sheet thickness (the thickness deviation of the same batch of sheets may reach ±0.1mm) and wear of clamping mechanism components (such as increased guide rail clearance) can lead to large fluctuations in the actual clamping force under the same lifting stroke. When the sheet thickness is less than the preset value, the clamping parts cannot fully contact the sheet, and the clamping force is too small. This can easily cause the sheet to shift or slip during feeding or rotation, affecting the subsequent bending and positioning accuracy. When the sheet thickness is greater than the preset value, the clamping parts excessively compress the sheet, and the clamping force is too large. This can not only easily cause plastic deformation of the sheet (especially for thin sheets, such as cold-rolled steel sheets with a thickness of ≤1mm), but may also leave indentations or scratches on the sheet surface, damaging the appearance quality of the sheet and increasing the defect rate.

[0006] On the other hand, existing equipment lacks a real-time monitoring and feedback mechanism for clamping force, and cannot dynamically adjust the clamping force according to the actual thickness of the sheet material. It requires frequent manual calibration of the lifting stroke parameters to adapt to different sheet material specifications, which is cumbersome and inefficient. At the same time, for sheet materials with protective films or softer materials (such as aluminum alloy sheets and stainless steel decorative sheets), the fixed lifting stroke control method is more likely to cause damage to the protective film or local dents in the sheet material, further limiting the applicability of the equipment and making it difficult to meet the bending processing needs of high-precision, multi-specification sheet materials. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a front feeding device for bending centers. This device pre-measures the thickness of the sheet metal to be clamped and applies corresponding pressure according to different sheet thicknesses, ensuring that the sheet metal is stably clamped without deformation due to excessive clamping force, thereby improving the yield rate.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] A bending center front feeding device includes a base and a feeding platform slidably mounted on its top. The feeding platform has a U-shaped structure. The base is provided with a linear displacement component that pushes the feeding platform to move along its length. A clamping rotation component is provided on one side of the feeding platform. A pressure sensor is provided at the bottom of the clamping rotation component. The feeding platform is provided with a pushing component and a thickness detection component.

[0010] The thickness detection component includes two symmetrically arranged upper laser displacement sensors and lower laser displacement sensors. The upper laser displacement sensors and lower laser displacement sensors are respectively fixedly installed on the top and bottom surfaces inside the feeding table. A light sensor is provided on the side of the feeding table near the lower laser displacement sensor.

[0011] The upper laser displacement sensor measures its distance from the top surface of the board, and the lower laser displacement sensor measures its distance from the bottom surface of the board. The measured values ​​of the upper and lower laser displacement sensors are read as analog quantities by the PLC controller and the corresponding distances are calculated. The thickness of the board is the distance between the upper and lower laser displacement sensors minus the distances from the upper and lower laser displacement sensors to the board.

[0012] Furthermore, the feeding assembly includes:

[0013] The support frame is symmetrically installed on the front and rear sides of the bottom surface of the inner wall of the feeding table. The light sensor is fixedly installed on the outer end of one of the support frames. The clamping and rotating assembly is used to clamp a part of the plate flush with the top of the support frame.

[0014] Synchronous pulleys are provided with mounting grooves at the bottom of the inner wall of the feeding platform, and synchronous pulleys are mounted on both sides of the mounting grooves via rotating shafts.

[0015] A timing belt, wherein the two timing pulleys are connected by a timing belt drive;

[0016] The first drive motor is fixedly installed inside the feeding table by a motor bracket, and the output shaft of the first drive motor is coaxially and fixedly connected to the rotating shaft located inside the feeding table.

[0017] A slide table is slidably installed in the mounting groove, and the front of the slide table is fixedly connected to the timing belt.

[0018] A pusher platform is fixedly installed on the upper end of the slide table, and the pusher platform is located between the two support frames.

[0019] Furthermore, the clamping rotation assembly includes a lifting drive assembly, a clamping rotation platform disposed outside the lifting drive assembly, an upper clamping member disposed at the bottom of the clamping rotation platform, a lower clamping member disposed relative to the upper clamping member, and a rotary motor for driving the lower clamping member to rotate. A support platform is fixedly installed on the lower part of the opening side of the feeding table, the rotary motor is fixedly installed on the top surface of the support platform, and the pressure sensor is disposed between the rotary motor and the support platform for detecting changes in the pressure on the rotary motor. The lifting drive assembly is fixedly disposed on the upper part of the opening side of the feeding table.

[0020] Furthermore, the lifting drive assembly includes a mounting bracket fixedly installed on the top of the feeding table. A second drive motor is fixedly installed on the outer end of the mounting bracket. A first screw is coaxially fixedly installed on the output end of the second drive motor. A vertically arranged slide groove is fixedly installed on the upper part of one side of the feeding table. A slider is slidably installed in the slide groove. A bracket is fixedly installed on the outer end of the slider. The bracket is threadedly engaged with the first screw. The bracket is fixedly connected to the outer side of the clamping rotating table.

[0021] Furthermore, a protective cover is fixedly installed on the upper part of the feeding platform, and the lifting drive assembly is located inside the protective cover.

[0022] Furthermore, the linear displacement assembly includes a third drive motor and a second screw fixedly connected to it on the same axis. The third drive motor is fixedly installed on one side of the base. A push block is slidably installed inside the base. The second screw passes through the push block laterally and is threadedly engaged with it. The upper end of the push block is fixedly connected to the bottom of the feeding table.

[0023] Furthermore, T-shaped slide rails are fixedly installed on both sides of the top surface of the base, and several slide blocks that slide in cooperation with the T-shaped slide rails are fixedly installed on the front and rear sides of the feeding platform.

[0024] Furthermore, several evenly distributed mounting seats are fixedly installed on the front and rear sides of the base.

[0025] Furthermore, two symmetrically arranged limiting rods are fixedly installed between the two support frames. L-shaped connecting rods are fixedly installed at both ends of the limiting rods, and the L-shaped connecting rods are fixedly connected to the support frame on the same side. Sliding sleeves are fixedly installed on the front and rear sides of the slide table, and the limiting rods pass through the corresponding sliding sleeves and slide in cooperation with them.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This device employs upper and lower laser displacement sensors to achieve automated, high-precision detection of sheet thickness, avoiding errors from manual measurement. Simultaneously, through the correlation control of thickness and clamping force, it prevents sheet displacement due to insufficient clamping force or deformation due to excessive force, balancing conveying stability and sheet integrity. Pressure sensors monitor clamping pressure in real time and dynamically correct clamping force deviations, further ensuring the clamping reliability of sheets of different thicknesses and reducing bending defects caused by clamping problems. It avoids both excessive clamping force leading to plastic deformation or surface damage and insufficient clamping force causing slippage during feeding, significantly improving sheet processing quality and conveying stability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is the front view of the present invention;

[0030] Figure 3 This is a side view of the present invention;

[0031] Figure 4 This is a top view of the present invention;

[0032] Figure 5 yes Figure 1 Enlarged view of part I;

[0033] Figure 6 This is a partial cross-sectional view of the feeding platform of the present invention;

[0034] Figure 7 This is a partial sectional view of the rear view structure;

[0035] Figure 8 This is a schematic diagram of the structure of the base of the present invention;

[0036] Figure 9 This is a schematic diagram of the feeding platform of the present invention.

[0037] The following are the reference numerals in the attached diagram: 10, base; 101, mounting base; 20, feeding table; 201, mounting slot; 30, linear displacement assembly; 301, third drive motor; 302, second screw; 303, push block; 304, T-shaped slide rail; 305, slide block; 40, clamping rotation assembly; 401, clamping rotation platform; 402, upper clamping component; 4021, lower clamping component; 403, rotary motor; 404, support platform; 50, pushing assembly; 501, support frame. ; 502, Synchronous pulley; 503, Synchronous belt; 504, First drive motor; 505, Slide table; 506, Pushing table; 507, Limiting rod; 508, Sliding sleeve; 60, Thickness detection component; 601, Upper laser displacement sensor; 602, Lower laser displacement sensor; 603, Light sensor; 70, Lifting drive component; 701, Mounting bracket; 702, Second drive motor; 703, First screw; 704, Slide groove; 705, Bracket; 80, Protective cover. Detailed Implementation

[0038] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0039] Example 1: A front feeding device for bending center

[0040] like Figure 1-9 As shown, a front feeding device for a bending center has the following specific structure:

[0041] The base 10 and the feeding table 20 slidably mounted on its top are provided. The feeding table 20 has a U-shaped structure. The base 10 is provided with a linear displacement component 30 that pushes the feeding table 20 to move along its length. A clamping rotation component 40 is provided on one side of the feeding table 20. A pressure sensor is provided at the bottom of the clamping rotation component 40. The feeding table 20 is provided with a pushing component 50 and a thickness detection component 60.

[0042] The thickness detection component 60 includes two symmetrically arranged upper laser displacement sensors 601 and lower laser displacement sensors 602. The upper laser displacement sensors 601 and lower laser displacement sensors 602 are respectively fixedly installed on the top and bottom surfaces inside the feeding table 20. A light sensor 603 is provided on the side of the feeding table 20 near the lower laser displacement sensor 602.

[0043] The upper laser displacement sensor 601 measures its distance from the top surface of the plate, and the lower laser displacement sensor 602 measures its distance from the bottom surface of the plate. The measured values ​​of the upper laser displacement sensor 601 and the lower laser displacement sensor 602 are read as analog quantities by the PLC controller and the corresponding distances are calculated. The thickness of the plate is the distance between the upper laser displacement sensor 601 and the lower laser displacement sensor 602 minus the distance from the upper laser displacement sensor 601 and the lower laser displacement sensor 602 to the plate.

[0044] The working principle described above is as follows:

[0045] In use, the sheet material to be processed is placed on top of the support frame 501 of the feeding table 20. After the light sensor 603 detects the sheet material, the upper laser displacement sensor 601 and the lower laser displacement sensor 602 are powered on and begin operation. At this time, the upper laser displacement sensor 601 measures the distance between itself and the top surface of the sheet material, and the lower laser displacement sensor 602 measures the distance between itself and the bottom surface of the sheet material. The PLC controller reads the analog values ​​from the two sensors and converts them into actual distances. The sheet material thickness is calculated by subtracting the distance from each sensor to the sheet material from the distance between the two sensors. The clamping rotation assembly 40 monitors the clamping action through the pressure sensor at the bottom. The required clamping force is determined by the thickness of the sheet material. For example, thicker sheets require a greater clamping force to ensure stability, while thinner sheets require a smaller clamping force to avoid deformation. The clamping force should not be too small or too large to ensure that the sheet material will not deform due to excessive clamping force when it is stably clamped. The clamping rotation component 40 clamps and fixes the sheet material according to the set clamping force. At the same time, the pressure sensor at its bottom monitors the actual clamping pressure in real time to ensure that it is consistent with the set value. After the sheet material is stably clamped, the linear displacement component 30 pushes the feeding table 20 to move along the length of the base 10, and the pushing component 50 pushes the sheet material to the designated position to complete the conveying and positioning of the sheet material.

[0046] The feeding assembly 50 includes:

[0047] Support frame 501, the support frame 501 is symmetrically installed on the front and rear sides of the bottom surface of the inner wall of the feeding table 20, the support frame 501 is fixedly installed in the feeding table 20, the light sensor 603 is fixedly installed on the outer end of one of the support frames 501, and the clamping rotation assembly 40 is used to clamp a part of the plate flush with the top of the support frame 501.

[0048] Synchronous pulley 502; a mounting groove 201 is opened at the bottom of the inner wall of the feeding table 20; synchronous pulley 502 is rotatably mounted on both sides of the mounting groove 201 via a rotating shaft; the rotating shaft is connected to the mounting groove 201 by a bearing; and the synchronous pulley 502 is fixedly mounted on the upper end of the corresponding rotating shaft.

[0049] The synchronous belt 503 connects the two synchronous pulleys 502 via the synchronous belt 503.

[0050] The first drive motor 504 is a stepper motor. The first drive motor 504 is fixedly installed inside the feeding table 20 by a motor bracket. The output shaft of the first drive motor 504 is coaxially fixedly connected to the rotating shaft located inside the feeding table 20.

[0051] The slide table 505 is slidably installed in the mounting groove 201, and the front of the slide table 505 is fixedly connected to the timing belt 503.

[0052] A pusher table 506 is fixedly installed on the upper end of the slide table 505. The pusher table 506 is located between the two support frames 501, and the top surface of the support frame 501 is located in the middle of the pusher table 506 to prevent the plate from tilting during pushing.

[0053] When the pushing assembly 50 is working, the first drive motor 504 drives the rotating shaft on the same side to rotate. Through the transmission cooperation of the synchronous pulley 502 and the synchronous belt 503, the slide table 505 is driven to slide in the mounting groove 201. The slide table 505 drives the pushing platform 506 to move between the two support frames 501, pushing the plate at the top of the support frame 501 to the clamping area of ​​the clamping rotating assembly 40. The part of the clamping rotating assembly 40 that clamps the plate is flush with the top of the support frame 501, ensuring that the plate is evenly stressed during the pushing process. The pushing platform 506 is located between the two support frames 501. The light sensor 603 is fixed to the outer end of the support frame 501, which can quickly detect whether the plate is in place and improve the continuity of the pushing action.

[0054] The clamping rotation assembly 40 includes a lifting drive assembly 70, a clamping rotation platform 401 disposed outside the lifting drive assembly 70, an upper clamping member 402 disposed at the bottom of the clamping rotation platform 401, a lower clamping member 4021 disposed relative to the upper clamping member 402, and a rotary motor 403 for driving the lower clamping member 4021 to rotate. A support platform 404 is fixedly installed on the lower part of the opening side of the feeding table 20. The rotary motor 403 is fixedly installed on the top surface of the support platform 404. A pressure sensor is disposed between the rotary motor 403 and the support platform 404 to detect changes in the pressure on the rotary motor 403. The lifting drive assembly 70 is fixedly disposed on the upper part of the opening side of the feeding table 20.

[0055] The lifting drive assembly 70 is used to adjust the height of the clamping rotary table 401, aligning the upper clamping member 402 and the lower clamping member 4021 with the plate clamping position. By adjusting the height of the clamping rotary table 401 through the lifting drive assembly 70, the upper clamping member 402 and the lower clamping member 4021 are closed or separated, thereby achieving the clamping and fixing or loosening of the plate. The rotary motor 403 drives the lower clamping member 4021 to rotate, causing the plate to rotate synchronously to the required bending angle. The pressure sensor is set between the rotary motor 403 and the support platform 404 to monitor the pressure changes on the rotary motor 403 in real time and provide real-time feedback of pressure data, which facilitates timely adjustment of the clamping force and avoids plate deformation or clamping failure.

[0056] The lifting drive assembly 70 includes a mounting bracket 701 fixedly installed on the top of the feeding table 20. A second drive motor 702 is fixedly installed on the outer end of the mounting bracket 701. A first screw 703 is coaxially fixedly installed on the output end of the second drive motor 702. A vertically arranged slide groove 704 is fixedly installed on the upper part of one side of the feeding table 20. A slider is slidably installed in the slide groove 704. A bracket 705 is fixedly installed on the outer end of the slider. The bracket 705 is threadedly engaged with the first screw 703. The bracket 705 is fixedly connected to the outer side of the clamping rotating table 401. The connecting shaft at the bottom of the clamping rotating table 401 passes through the bracket 705 and is connected to its bearing.

[0057] The second drive motor 702 drives the first screw 703 to rotate. Since the bracket 705 slides with the slide groove 704 through the slider and the bracket 705 is fixedly connected to the clamping rotating table 401, the rotation of the screw drives the bracket 705 to move up and down along the slide groove 704, thereby adjusting the height of the clamping rotating table 401 to adapt to the clamping requirements of plates of different thicknesses.

[0058] A protective cover 80 is fixedly installed on the upper part of the feeding platform 20, and the lifting drive assembly 70 is located inside the protective cover 80. The protective cover 80 completely encloses the lifting drive assembly 70, forming a physical protective barrier, isolating the moving parts of the lifting drive assembly 70, preventing accidental contact by operators and thus improving the safety of equipment use.

[0059] The linear displacement assembly 30 includes a third drive motor 301 and a second screw 302 coaxially fixedly connected thereto. The third drive motor 301 is fixedly installed on one side of the base 10. A push block 303 is slidably installed inside the base 10. The second screw 302 passes laterally through the push block 303 and is threadedly engaged with it. The upper end of the push block 303 is fixedly connected to the bottom of the feeding table 20. The third drive motor 301 drives the second screw 302 to rotate. Since the push block 303 is threadedly engaged with the second screw 302 and is fixedly connected to the bottom of the feeding table 20, the rotation of the screw causes the push block 303 to slide along the inside of the base 10, thereby pushing the feeding table 20 to move along the length direction, realizing the longitudinal feeding of the sheet material.

[0060] T-shaped slide rails 304 are fixedly installed on both sides of the top surface of the base 10, and several slide blocks 305 that slide in cooperation with the T-shaped slide rails 304 are fixedly installed on the front and rear sides of the feeding table 20. The slide blocks 305 on the front and rear sides of the feeding table 20 slide in cooperation with the T-shaped slide rails 304 on the top surface of the base 10. When the linear displacement component 30 drives the feeding table 20 to move, the slide blocks 305 slide smoothly along the T-shaped slide rails 304, which can effectively limit the lateral displacement of the feeding table 20, ensure that the feeding table 20 moves in a straight line, and improve the feeding accuracy.

[0061] Several evenly distributed mounting seats 101 are fixedly installed on the front and rear sides of the base 10. During installation, the base 10 is fixed to the ground or the corresponding work position at the bending center by bolts or other fasteners to achieve overall fixation of the equipment.

[0062] Two symmetrically arranged limiting rods 507 are fixedly installed between the two support frames 501. L-shaped connecting rods are fixedly installed at both ends of each limiting rod 507, and the L-shaped connecting rods are fixedly connected to the support frame 501 on the same side. Sliding sleeves 508 are fixedly installed on the front and rear sides of the slide table 505, and the limiting rods 507 pass through the corresponding sliding sleeves 508 and slide in cooperation with them. When the slide table 505 moves with the timing belt 503, the sliding sleeves 508 slide along the limiting rods 507, further restricting the movement trajectory of the slide table 505, preventing the slide table 505 from shifting forward or backward during the pushing process, improving the pushing accuracy; enhancing the structural stability of the slide table 505, preventing the slide table 505 from tilting due to uneven force, and ensuring the smoothness of the pushing action of the pushing table 506.

[0063] Example 2:

[0064] Based on Example 1, after the board is placed on top of the support frame 501 of the feeding table 20, the light sensor 603 first detects the board and outputs a switch signal (high level / low level), triggering the upper laser displacement sensor 601 and the lower laser displacement sensor 602 to start detection; both laser displacement sensors work based on the principle of laser triangulation: the laser emitter inside the sensor emits a modulated laser beam, which is reflected by the surface of the board and captured by the photosensitive element (such as CCD / CMOS image sensor) at the receiving end. The photosensitive element converts the received light signal into an analog electrical signal (voltage / current signal, usually 0-5V or 4-20mA standard industrial signal).

[0065] The analog electrical signal is transmitted to the analog input module of the PLC controller through a shielded cable. The module converts the analog signal into a digital signal (such as a 16-bit or 32-bit binary number) that the PLC controller can recognize. The PLC controller calculates the thickness of the plate by its internal program according to the preset "sensor spacing parameters" (i.e., the fixed vertical distance between the upper and lower sensors when they are installed, which is stored in the PLC memory in advance): Plate thickness = sensor spacing - (distance from the upper sensor to the top surface of the plate + distance from the lower sensor to the bottom surface of the plate), thus completing the digital processing of the thickness data.

[0066] The PLC controller matches the calculated digital signal of the plate thickness with the internally stored "thickness-clamping force correlation database" (e.g., 1mm thickness corresponds to 500N clamping force, 5mm thickness corresponds to 1500N clamping force, etc., based on the plate material and strength preset), automatically generates a digital control signal for the target clamping force, and transmits the signal to the drive unit of the clamping rotation assembly 40 through the PLC's digital output module or pulse output module.

[0067] The pressure sensor (a strain gauge pressure sensor) at the bottom of the clamping rotating assembly 40 monitors the pressure during the clamping process in real time: the strain gauge inside the sensor undergoes mechanical deformation as the clamping force changes, causing the resistance value of the strain gauge to change (following Ohm's law, the amount of resistance change is proportional to the magnitude of the force); this resistance change is converted into a weak voltage signal (usually in the mV range) by a Wheatstone bridge circuit, and then amplified into a standard analog signal (4-20mA) by the signal amplification circuit (such as an operational amplifier) ​​built into the sensor, and then sent back to the analog input module of the PLC.

[0068] The PLC compares the actual clamping force signal fed back by the pressure sensor with the preset target clamping force signal. If there is a deviation (such as the actual force being 10% smaller than the target force), the PLC outputs a correction signal through the PID (proportional-integral-derivative) adjustment algorithm to control the clamping drive unit until the actual force fed back by the pressure sensor is consistent with the target force, thus forming an electrical closed-loop control to ensure that the clamping force is accurately adapted to the thickness of the sheet material.

[0069] The laser displacement sensor has high optical-to-electrical signal conversion accuracy (typically with a resolution of up to μm level). Combined with the high-precision analog signal processing of the PLC, it avoids human measurement errors and ensures that the thickness detection error is ≤0.01mm. At the same time, through the Wheatstone bridge and PID closed-loop control, the clamping force control accuracy is ≤±5%, which completely solves the problem of "thin material deformation and thick material displacement".

[0070] The electrical signals of each sensor and PLC adopt standard industrial interfaces and shielded transmission, which has strong anti-electromagnetic interference capability (adapting to the complex electromagnetic environment of bending workshops, such as interference generated by motors and frequency converters), ensuring stable signal transmission and avoiding detection or control failures caused by signal distortion.

[0071] The entire process of thickness detection, clamping force calculation, and pressure feedback is completed automatically, improving response time, significantly shortening the preparation cycle before bending, and reducing manual intervention to lower equipment failure or product defect rate caused by operational errors.

[0072] The location of the PLC controller described in this solution is set by the operator according to the actual situation during operation. The controller is used to control the electrical components used in this solution, including but not limited to the upper laser displacement sensor 601 and the lower laser displacement sensor 602, pressure sensor, and motor. It also includes a motherboard, memory modules, storage media, and a power supply, which is AC power. When a display screen is provided, a display card is also included. For the operating principle of the controller, please refer to "Automatic Control Principles," "Microcontroller Principles and Application Simulation Cases," and "Sensor Principles and Applications" published by Tsinghua University Press. Other books in this field can also be consulted. Other automation control and electrical components not mentioned are knowledge well-known to those skilled in the art and will not be elaborated upon here.

[0073] In explaining this invention, it should be noted that the terms indicating location are used only for ease of description and understanding, and are not intended to limit the installation location of specific technical features. Other possible installation methods are not excluded.

[0074] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front feeding device for a bending center, comprising a base (10) and a feeding table (20) slidably mounted on its top, wherein the feeding table (20) has a U-shaped structure, characterized in that: The base (10) is provided with a linear displacement component (30) that pushes the feeding table (20) to move along its length direction. A clamping rotation component (40) is provided on one side of the feeding table (20). A pressure sensor is provided at the bottom of the clamping rotation component (40). The feeding table (20) is provided with a pushing component (50) and a thickness detection component (60). The thickness detection component (60) includes two symmetrically arranged upper laser displacement sensors (601) and lower laser displacement sensors (602). The upper laser displacement sensors (601) and lower laser displacement sensors (602) are respectively fixedly installed on the top and bottom surfaces inside the feeding table (20). A light sensor (603) is provided on the side of the feeding table (20) near the lower laser displacement sensor (602). The upper laser displacement sensor (601) measures the distance between itself and the top surface of the plate, and the lower laser displacement sensor (602) measures the distance between itself and the bottom surface of the plate. The measured values ​​of the upper laser displacement sensor (601) and the lower laser displacement sensor (602) are read by the PLC controller to read the analog quantity and calculate the corresponding distance. The thickness of the plate is the distance between the upper laser displacement sensor (601) and the lower laser displacement sensor (602) minus the distance from the upper laser displacement sensor (601) and the lower laser displacement sensor (602) to the plate. The clamping rotation assembly (40) monitors the clamping pressure through the pressure sensor at the bottom, and first detects the thickness of the plate through the upper laser displacement sensor (601) and the lower laser displacement sensor (602), and then determines the clamping force required to fix the plate. The clamping rotation assembly (40) clamps and fixes the plate according to the set clamping force. At the same time, the pressure sensor at the bottom monitors the actual clamping pressure in real time to ensure that it is consistent with the set value. After the plate is stably clamped, the linear displacement assembly (30) pushes the feeding table (20) to move along the length direction of the base (10). The pushing assembly (50) pushes the plate to the designated position to complete the conveying and positioning of the plate. The pusher assembly (50) includes: Support frame (501), the support frame (501) is symmetrically installed on the front and rear sides of the bottom surface of the inner wall of the feeding table (20). The light sensor (603) is fixedly installed on the outer end of one of the support frames (501). The clamping rotation assembly (40) is used to clamp a part of the plate flush with the top of the support frame (501). Synchronous wheel (502), the bottom of the inner wall of the feeding table (20) is provided with an installation groove (201), and the synchronous wheel (502) is installed on both sides of the installation groove (201) by rotating shafts. A timing belt (503) is used to drive the two timing pulleys (502). The first drive motor (504) is fixedly installed inside the feeding table (20) by a motor bracket. The output shaft of the first drive motor (504) is coaxially fixedly connected to the rotating shaft located inside the feeding table (20). The slide (505) is slidably installed in the mounting groove (201), and the front of the slide (505) is fixedly connected to the timing belt (503); A pusher table (506) is fixedly installed on the upper end of the slide table (505), and the pusher table (506) is located between the two support frames (501); The clamping rotation assembly (40) includes a lifting drive assembly (70), a clamping rotation platform (401) disposed outside the lifting drive assembly (70), an upper clamping member (402) disposed at the bottom of the clamping rotation platform (401), a lower clamping member (4021) disposed relative to the upper clamping member (402), and a rotary motor (403) for driving the lower clamping member (4021) to rotate. A support platform (404) is fixedly installed on the lower part of the opening side of the feeding table (20). The rotary motor (403) is fixedly installed on the top surface of the support platform (404), and the pressure sensor is disposed between the rotary motor (403) and the support platform (404) to detect the change in pressure on the rotary motor (403). The lifting drive assembly (70) is fixedly disposed on the upper part of the opening side of the feeding table (20).

2. The bending center front feeding device according to claim 1, characterized in that: The lifting drive assembly (70) includes a mounting bracket (701) fixedly installed on the top of the feeding table (20). A second drive motor (702) is fixedly installed on the outer end of the mounting bracket (701). A first screw (703) is fixedly installed coaxially on the output end of the second drive motor (702). A vertically arranged slide groove (704) is fixedly installed on the upper part of one side of the feeding table (20). A slider is slidably installed in the slide groove (704). A bracket (705) is fixedly installed on the outer end of the slider. The bracket (705) is threadedly engaged with the first screw (703). The bracket (705) is fixedly connected to the outer side of the clamping rotating table (401).

3. The bending center front feeding device according to claim 2, characterized in that: A protective cover (80) is fixedly installed on the upper part of the feeding table (20), and the lifting drive assembly (70) is located inside the protective cover (80).

4. The bending center front feeding device according to claim 1, characterized in that: The linear displacement assembly (30) includes a third drive motor (301) and a second screw (302) coaxially fixedly connected thereto. The third drive motor (301) is fixedly installed on one side of the base (10). A push block (303) is slidably installed inside the base (10). The second screw (302) passes through the push block (303) laterally and is threadedly engaged with it. The upper end of the push block (303) is fixedly connected to the bottom of the feeding table (20).

5. The bending center front feeding device according to claim 4, characterized in that: T-shaped slide rails (304) are fixedly installed on both sides of the top surface of the base (10), and several slide blocks (305) that slide in cooperation with the T-shaped slide rails (304) are fixedly installed on the front and rear sides of the feeding platform (20).

6. The bending center front feeding device according to claim 1, characterized in that: Several evenly distributed mounting seats (101) are fixedly installed on the front and rear sides of the base (10).

7. The bending center front feeding device according to claim 1, characterized in that: Two symmetrically arranged limiting rods (507) are fixedly installed between the two support frames (501). L-shaped connecting rods are fixedly installed at both ends of the limiting rods (507). The L-shaped connecting rods are fixedly connected to the support frames (501) on the same side. Sliding sleeves (508) are fixedly installed on the front and rear sides of the slide table (505). The limiting rods (507) pass through the corresponding sliding sleeves (508) and slide with them.

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