Bending center front feeding equipment

Abstract

The invention provides bending center front feeding equipment, and mainly relates to the technical field of bending machine tools. A bending center front feeding device comprises a base and a feeding table installed at the top of the base in a sliding fit mode, the feeding table is of a U-shaped structure, a linear displacement assembly pushing the feeding table to move in the length direction of the base is arranged in the base, a clamping rotating assembly is arranged on one side of the feeding table, and a clamping groove is formed in the other side of the feeding table. A pressure sensor is arranged at the bottom of the clamping rotating assembly, and a pushing assembly and a thickness detecting assembly are arranged in the feeding table. The device has the beneficial effects that through the mutual compensation synergistic effect of the thickness detection assembly and the pressure sensor, accurate control over the clamping pressure of plates with different thicknesses is achieved, it is guaranteed that the device can stably clamp the plates, meanwhile, plate damage caused by too large clamping force is avoided, and the plate bending quality is improved.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of bending machine, and particularly relates to a front feeding device of a bending center. BACKGROUND

[0002] The bending center is a device for bending metal sheets. The sheets are manually fed to the front feeding device, and the front feeding device cooperates with the main machine to bend the sheets. The feeding and clamping of the sheets before bending are key links to ensure the bending accuracy. The current mainstream front feeding device of the bending center generally relies on the technical scheme of "lifting stroke control clamping force". The clamping force on the sheet is indirectly controlled by the displacement of the mechanical structure through the preset lifting stroke of the clamping mechanism (such as upper and lower clamping pieces). That is, the fixed distance of the lowering of the clamping pieces is set to make the clamping pieces contact and extrude the sheet, thereby fixing the sheet.

[0003] The Chinese patent application with the publication number CN 114160691 B discloses a front feeding device of a bending center, which comprises a fixed base, a C-shaped pressure arm driving device, a C-shaped pressure arm, a rotary positioning mechanism, an auxiliary feeding manipulator, a sheet front end positioning assembly, a sheet left side positioning assembly, a sheet right side auxiliary pushing assembly, a sheet rear side auxiliary pushing assembly, and a feeding and discharging platform. The front feeding device of the bending center positions the sheet comprehensively. The front end and the left end of the sheet are positioned by positioning blocks, and the right end and the rear end of the sheet are pushed by auxiliary pushing mechanisms. The workpiece is positioned more accurately, and the deviation caused by manual feeding is avoided. Meanwhile, for some special-shaped workpieces, the secondary positioning of the workpiece can be realized through the cooperation between the positioning mechanisms, the machining range of the workpiece is expanded, and the utilization rate of the equipment is improved.

[0004] However, the bending center feeding device has the following defects in actual use. On the one hand, the size of the clamping force completely depends on the accuracy of the lifting stroke. In actual application, factors such as the thickness tolerance of the sheet (for example, the thickness deviation of the same batch of sheets may reach ±0.1 mm), the wear of the clamping mechanism components (for example, the increase of the gap between the guide rails), and the like may cause the actual clamping force under the same lifting stroke to fluctuate greatly. When the thickness of the sheet is less than the preset value, the clamping pieces cannot fully contact the sheet, the clamping force is too small, and the sheet is prone to displacement and slipping during feeding or rotation, which affects the subsequent bending positioning accuracy. When the thickness of the sheet is greater than the preset value, the clamping pieces excessively extrude the sheet, the clamping force is too large, and the sheet is prone to plastic deformation (especially for thin sheets such as cold-rolled steel sheets with a thickness of ≤1 mm). In addition, the clamping pieces may leave marks or scratches on the surface of the sheet, which damages the appearance quality of the sheet and increases the rate of defective products.

[0005] On the other hand, the existing equipment lacks real-time monitoring and feedback mechanism of clamping force, and cannot dynamically adjust the clamping force according to the actual thickness of the plate. It needs to be manually calibrated frequently to adapt to different specifications of the plate, which is tedious and inefficient. At the same time, for the plate with protective film on the surface or soft material (such as aluminum alloy plate, stainless steel decorative plate), the fixed lifting stroke control mode is more likely to cause damage to the protective film or local indentation of the plate, further limiting the application range of the equipment, and it is difficult to meet the bending processing needs of high-precision and multi-specification plates. SUMMARY

[0006] To solve the problems of the prior art, the present application provides a bending center front feeding device. The device measures the thickness of the plate to be clamped in advance and applies appropriate pressure according to different plate thicknesses to ensure that the plate is stably clamped without deformation caused by excessive clamping force, thereby improving the yield.

[0007] To achieve the above-mentioned purpose, the following technical solutions are adopted: A bending center front feeding device, comprising a base and a feeding table slidingly installed on the top of the base. The feeding table is in U-shaped structure. A linear displacement assembly is arranged in the base to move the feeding table along the length direction. A clamping and rotating assembly is arranged on one side of the feeding table. A pressure sensor is arranged at the bottom of the clamping and rotating assembly. A pushing assembly and a thickness detection assembly are arranged in the feeding table. The thickness detection assembly comprises two symmetrical upper and lower laser displacement sensors. The upper and lower laser displacement sensors are respectively fixedly installed on the top and bottom surfaces inside the feeding table. A light sensor is arranged on one side of the feeding table close to the lower laser displacement sensor. The upper laser displacement sensor measures the distance from the top surface of the plate, and the lower laser displacement sensor measures the distance from the bottom surface of the plate. The measured values of the upper and lower laser displacement sensors are read by the PLC controller as analog quantities and converted into corresponding distances. The thickness of the plate is the distance between the upper and lower laser displacement sensors minus the distance from the upper and lower laser displacement sensors to the plate.

[0008] Further, the pushing assembly comprises: Support frames are symmetrically installed on the front and rear sides of the inner wall bottom surface 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. Synchronous wheels are rotatably installed on both sides of the installation groove in the bottom of the inner wall of the feeding table through the shaft. Synchronous belts are drivingly connected between the two synchronous wheels. A first driving motor is fixedly installed inside the feeding table through a motor bracket, and an output shaft of the first driving motor is coaxially fixedly connected with a rotating shaft located inside the feeding table. A sliding table is slidingly and fittingly installed in the installation groove, and a front face of the sliding table is fixedly connected with the synchronous belt. A pushing table is fixedly installed at an upper end of the sliding table, and the pushing table is located between the two support frames.

[0009] Further, the clamping and rotating assembly comprises a lifting driving assembly, a clamping and rotating machine table arranged outside the lifting driving assembly, an upper clamping piece arranged at a bottom of the clamping and rotating machine table, a lower clamping piece arranged opposite to the upper clamping piece, and a rotating motor for driving the lower clamping piece to rotate, a support platform is fixedly installed at a lower part of the opening side of the feeding table, the rotating motor is fixedly installed at a top face of the support platform, and the pressure sensor is arranged between the rotating motor and the support platform for detecting the change of the pressure borne by the rotating motor, and the lifting driving assembly is fixedly arranged at an upper part of the opening side of the feeding table.

[0010] Further, the lifting driving assembly comprises a mounting frame fixedly installed at a top of the feeding table, a second driving motor is fixedly installed at an outer end of the mounting frame, a first screw rod is coaxially and fixedly installed at an output end of the second driving motor, a vertically arranged sliding groove is fixedly installed at an upper part of one side of the feeding table, a sliding block is slidingly and fittingly installed in the sliding groove, a bracket is fixedly installed at an outer end of the sliding block, the bracket is in threaded cooperation with the first screw rod, and the bracket is fixedly connected with an outer side of the clamping and rotating machine table.

[0011] Further, a protective cover is fixedly installed at an upper part of the feeding table, and the lifting driving assembly is located in the protective cover.

[0012] Further, the linear displacement assembly comprises a third driving motor and a second screw rod coaxially and fixedly connected with the third driving motor, the third driving motor is fixedly installed at one side of the base, a pushing block is slidingly and fittingly installed in the base, the second screw rod penetrates through the pushing block in a transverse direction and is in threaded cooperation with the pushing block, and an upper end of the pushing block is fixedly connected with a bottom of the feeding table.

[0013] Further, T-shaped sliding rails are fixedly installed at two sides of a top face of the base, and a plurality of sliding seats slidingly and fittingly connected with the T-shaped sliding rails are fixedly installed at front and back sides of the feeding table.

[0014] Further, a plurality of uniformly distributed mounting seats are fixedly installed at front and back sides of the base.

[0015] Further, two front and rear symmetrical limiting rods are fixedly installed between the two support frames, two ends of the limiting rods are fixedly installed with L-shaped connecting rods respectively, the L-shaped connecting rods are fixedly connected with the same side support frame respectively, the slide table is fixedly installed with slide sleeves on the front and rear sides respectively, the limiting rods respectively penetrate through the corresponding slide sleeves and are in sliding cooperation with the slide sleeves.

[0016] Compared with the prior art, the present application has the following advantages: The device adopts upper and lower laser displacement sensors to realize automatic and high-precision detection of the thickness of the plate, avoiding measurement errors caused by manual measurement. At the same time, through the associated control of the thickness and the clamping force, the clamping force is avoided to be too small to cause the plate to shift or too large to cause the plate to deform, and the conveying stability and the integrity of the plate are considered. The pressure sensor monitors the clamping pressure in real time, and can dynamically correct the clamping force deviation, further guaranteeing the clamping reliability of plates of different thicknesses, reducing the bending scrap rate caused by clamping problems, avoiding plastic deformation or surface damage of the plate caused by excessive clamping force, and preventing feeding slip caused by insufficient clamping force, greatly improving the plate processing quality and conveying stability. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a front view of the present application; Figure 3 is a side view of the present application; Figure 4 is a top view of the present application; Figure 5 is Figure 1 is a partial enlarged view of I of the present application; Figure 6 is a partial sectional view of the structure of the feeding table of the present application; Figure 7 is a partial sectional view of the structure of the present application; Figure 8 is a structural schematic diagram of the base of the present application; Figure 9 is a structural schematic diagram of the feeding table of the present application.

[0018] 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

[0019] 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.

[0020] Example 1: A front feeding device for bending center like Figures 1-9 As shown, a front feeding device for a bending center has the following specific structure: 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. 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 from the top surface of the plate, and the lower laser displacement sensor 602 measures the distance from the bottom surface of the plate. The measurement values of the upper laser displacement sensor 601 and the lower laser displacement sensor 602 are read by the PLC controller as analog signals and converted into corresponding distances. 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 plate.

[0021] The working principle is as follows: When the device is in use, the plate to be processed is placed on the top of the support frame 501 of the feeding table 20. After the light sensor 603 detects the plate, the upper laser displacement sensor 601 and the lower laser displacement sensor 602 are powered on and work. At this time, the upper laser displacement sensor 601 measures the distance from the top surface of the plate, and the lower laser displacement sensor 602 measures the distance from the bottom surface of the plate. The analog signals of the two sensors are read by the PLC controller and converted into actual distances. The thickness of the plate is calculated by subtracting the distance from the plate from the distance between the two sensors. The clamping and rotating assembly 40 monitors the clamping pressure through the pressure sensor at the bottom. The required clamping force is determined by the thickness of the plate. For example, thicker plates require more clamping force to ensure stability, and thinner plates require less clamping force to avoid deformation. The clamping force should not be too small or too large to ensure that the plate will not deform due to excessive clamping force when it is clamped stably. The clamping and rotating assembly 40 clamps and fixes the plate according to the set clamping force, and 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 clamped stably, the feeding table 20 is moved along the length direction of the base 10 by the linear displacement assembly 30, and the plate is pushed to the designated position by the pushing assembly 50, completing the conveying and positioning of the plate.

[0022] The pushing assembly 50 comprises: The support frame 501 is symmetrically installed on the front and rear sides of the inner wall bottom surface 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. The clamping and rotating assembly 40 is used to clamp a part of the plate flush with the top of the support frame 501. The synchronous wheel 502 is installed in the installation groove 201 at the bottom of the inner wall of the feeding table 20. The synchronous wheel 502 is rotatably installed on the two sides of the installation groove 201 through the shaft. The shaft is connected with the bearing of the installation groove 201. The synchronous wheel 502 is fixedly installed on the upper end of the corresponding shaft. The synchronous belt 503 is drivingly connected between the two synchronous wheels 502. The first driving motor 504 is a step motor, the inside of the feeding table 20 is fixedly installed with the first driving motor 504 through a motor bracket, and the output shaft of the first driving motor 504 is coaxially and fixedly connected with the rotating shaft located inside the feeding table 20. The slide table 505 is slidingly and fittingly installed in the installation groove 201, and the front face of the slide table 505 is fixedly connected with the synchronous belt 503. The pushing table 506 is fixedly installed at the upper end of the slide table 505, is located between the two support frames 501, and the top face of the support frame 501 is located at the middle part of the pushing table 506, so as to avoid the inclination of the plate during pushing.

[0023] When the pushing assembly 50 works, the first driving motor 504 drives the rotating shaft on the same side to rotate, drives the slide table 505 to slide in the installation groove 201 through the transmission cooperation of the synchronous wheel 502 and the synchronous belt 503, drives the pushing table 506 to move between the two support frames 501, pushes the plate on the top of the support frame 501 to the clamping area of the clamping and rotating assembly 40, and the part of the clamping and rotating assembly 40 clamping the plate is flush with the top of the support frame 501, so as to ensure that the plate is uniformly stressed during pushing. The pushing table 506 is located between the two support frames 501; the light sensor 603 is fixed to the outer end of the support frame 501, can quickly detect whether the plate is in place, and improves the continuity of the pushing action.

[0024] The clamping and rotating assembly 40 comprises a lifting driving assembly 70, a clamping and rotating machine table 401 arranged outside the lifting driving assembly 70, an upper clamping piece 402 arranged at the bottom of the clamping and rotating machine table 401, a lower clamping piece 4021 arranged opposite to the upper clamping piece 402, and a rotating motor 403 for driving the lower clamping piece 4021 to rotate, the lower part of the opening side of the feeding table 20 is fixedly installed with a support platform 404, the rotating motor 403 is fixedly installed on the top face of the support platform 404, the pressure sensor is arranged between the rotating motor 403 and the support platform 404 for detecting the change of the pressure borne by the rotating motor 403, and the lifting driving assembly 70 is fixedly arranged at the upper part of the opening side of the feeding table 20.

[0025] The lifting driving assembly 70 is used to adjust the height of the clamping rotary machine table 401, so that the upper clamping part 402 and the lower clamping part 4021 are aligned with the plate clamping position. The height of the clamping rotary machine table 401 is adjusted by the lifting driving assembly 70, so that the upper clamping part 402 and the lower clamping part 4021 are closed or separated, so as to realize the clamping and fixing or loosening of the plate part. The rotary motor 403 drives the lower clamping part 4021 to rotate, and drives the plate to rotate synchronously to the required bending angle. The pressure sensor is arranged between the rotary motor 403 and the support platform 404, and the pressure change of the rotary motor 403 is monitored in real time, and the pressure data is fed back in real time, so as to adjust the clamping force in time, avoid plate deformation or clamping failure.

[0026] The lifting driving assembly 70 comprises a mounting frame 701 fixedly installed on the top of the feeding table 20. The outer end of the mounting frame 701 is fixedly installed with a second driving motor 702. The output end of the second driving motor 702 is coaxially fixedly installed with a first screw rod 703. The upper part of one side of the feeding table 20 is fixedly installed with a vertically arranged sliding groove 704. The sliding groove 704 is slidably installed with a sliding block. The outer end of the sliding block is fixedly installed with a bracket 705. The bracket 705 is threadedly connected with the first screw rod 703. The bracket 705 is fixedly connected with the outer side of the clamping rotary machine table 401. The connecting shaft at the bottom of the clamping rotary machine table 401 penetrates through the bracket 705 and is connected with the bearing thereof.

[0027] The second driving motor 702 drives the first screw rod 703 to rotate. Since the bracket 705 is slidably connected with the sliding groove 704 through the sliding block, and the bracket 705 is fixedly connected with the clamping rotary machine table 401, the rotation of the screw rod drives the bracket 705 to move up and down along the sliding groove 704, thereby adjusting the height of the clamping rotary machine table 401 to adapt to the clamping requirements of plates with different thicknesses.

[0028] The upper part of the feeding table 20 is fixedly installed with a protective cover 80. The lifting driving assembly 70 is located in the protective cover 80. The lifting driving assembly 70 is completely wrapped in the protective cover 80 to form a physical protection barrier, which isolates the moving parts of the lifting driving assembly 70 and prevents safety accidents caused by accidental touch of the operator, thereby improving the safety of the equipment.

[0029] The linear displacement assembly 30 comprises a third driving motor 301 and a second screw rod 302 coaxially fixedly connected with the third driving motor 301, the third driving motor 301 is fixedly installed on one side of the base 10, a push block 303 is slidingly and fittingly installed in the base 10, the second screw rod 302 penetrates through the push block 303 in a transverse direction and is in threaded cooperation with the push block 303, and the upper end of the push block 303 is fixedly connected with the bottom of the feeding table 20. The third driving motor 301 drives the second screw rod 302 to rotate, since the push block 303 is in threaded cooperation with the second screw rod 302 and the push block 303 is fixedly connected with the bottom of the feeding table 20, the rotation of the screw rod drives the push block 303 to slide along the inside of the base 10, thereby pushing the feeding table 20 to move in the length direction, and longitudinal feeding of the plate material is realized.

[0030] The top surface of the base 10 is fixedly installed with T-shaped sliding rails 304 on both sides, and the feeding table 20 is fixedly installed with sliding blocks 305 in sliding cooperation with the T-shaped sliding rails 304 on both front and back sides. The sliding blocks 305 on both front and back sides of the feeding table 20 are in sliding cooperation with the T-shaped sliding rails 304 on the top surface of the base 10, when the linear displacement assembly 30 drives the feeding table 20 to move, the sliding blocks 305 stably slide along the T-shaped sliding rails 304, which can effectively limit the transverse deviation of the feeding table 20, ensure the linear movement of the feeding table 20, and improve the feeding accuracy.

[0031] The base 10 is fixedly installed with a plurality of evenly distributed mounting seats 101 on both front and back sides. During installation, the base 10 is fixedly installed on the ground or the corresponding station of the bending center through fastening members such as bolts, thereby realizing the overall fixation of the equipment.

[0032] Two limiting rods 507 symmetrically arranged front and back are fixedly installed between the two support frames 501, L-shaped connecting rods are fixedly installed at both ends of the limiting rods 507 respectively, the L-shaped connecting rods are fixedly connected with the same side support frames 501 respectively, sliding sleeves 508 are fixedly installed on both front and back sides of the sliding table 505 respectively, and the limiting rods 507 penetrate through the corresponding sliding sleeves 508 in a sliding cooperation manner. When the sliding table 505 moves with the synchronous belt 503, the sliding sleeves 508 slide along the limiting rods 507, further limiting the movement track of the sliding table 505, avoiding the front and back deviation of the sliding table 505 during the pushing process, improving the pushing accuracy of the sliding table 505, enhancing the structural stability of the sliding table 505, preventing the sliding table 505 from tilting due to uneven stress, and ensuring the stability of the pushing action of the pushing table 506.

[0033] Embodiment two: On the basis of embodiment one, after placing the plate on the top of the support frame 501 of the feeding table 20, the light sensor 603 detects the plate first and outputs an on-off signal (high / low level), triggering the upper and lower laser displacement sensors 601 and 602 to start detection. Both laser displacement sensors work based on the laser triangulation ranging principle: the laser emitter inside the sensor emits a modulated laser beam, which is reflected by the plate surface and captured by the photosensitive element (such as a 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).

[0034] 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 plate thickness based on the pre-set "sensor spacing parameter" (the fixed vertical distance between the upper and lower sensors during installation, pre-stored in the PLC memory): 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), completing the digital processing of the thickness data.

[0035] The PLC controller matches the calculated plate thickness digital signal with the "thickness-clamping force correlation database" (for example: thickness 1mm corresponds to clamping force 500N, thickness 5mm corresponds to clamping force 1500N, etc., based on the material and strength of the plate) stored in the internal memory, automatically generates a digital control signal of the target clamping force, and transmits the signal to the drive unit of the clamping rotary assembly 40 through the digital output module or pulse output module of the PLC.

[0036] The pressure sensor (strain gauge type pressure sensor) at the bottom of the clamping rotary assembly 40 monitors the pressure in real time during clamping: the strain gauge inside the sensor changes mechanically with the clamping force, causing the resistance value of the strain gauge to change (following Ohm's law, the amount of resistance change is proportional to the size of the force); this resistance change is converted by a Wheatstone bridge circuit into a weak voltage signal (usually in the order of mV), which is amplified by a signal amplification circuit (such as an operational amplifier) built into the sensor into a standard analog signal (4-20mA), which is returned to the analog input module of the PLC.

[0037] The PLC compares the actual clamping force signal fed back by the pressure sensor with the pre-set target clamping force signal. If there is a deviation (such as the actual force being 10% less than the target force), a correction signal is output through the PID (proportional-integral-derivative) adjustment algorithm to control the clamping drive unit until the actual force fed back by the pressure sensor matches the target force, forming an electrical closed-loop control to ensure that the clamping force accurately adapts to the thickness of the plate.

[0038] The photoelectric signal conversion precision of the laser displacement sensor is high (the resolution can reach the mu m level generally), the high-precision analog quantity processing of the PLC is matched, the manual measurement error is avoided, the thickness detection error is guaranteed to be less than or equal to 0.01 mm; meanwhile, through the Wheatstone bridge and the PID closed loop control, the clamping force control precision is less than or equal to ±5%, and the problems of 'thin material deformation and thick material displacement' are completely solved.

[0039] The electrical signals of each sensor and the PLC adopt standard industrial interfaces and shielded transmission, and the anti-electromagnetic interference ability is strong (adapted to the complex electromagnetic environment of a bending workshop, such as the interference generated by a motor and a frequency converter), so that the signal transmission is stable, and the detection or control failure caused by signal distortion is avoided.

[0040] The running processes of thickness detection, clamping force calculation and pressure feedback are automatically completed, the response time is improved, the preparation period before bending is greatly shortened, manual intervention links are reduced, and equipment failures or product substandard rates caused by operation errors are reduced.

[0041] The position of the PLC controller described in the scheme is set by the actual situation when the worker operates, the controller is used for controlling the electrical devices used in the scheme, including but not limited to the upper laser displacement sensor 601 and the lower laser displacement sensor 602, the pressure sensor and the motor; and the mainboard, the memory bar, the storage medium and the power supply are also used therewith, the power supply is a commercial power supply; when having a display screen, a display card is also provided; for the operation principle of the controller, please refer to 'Automatic Control Principle', 'Microcontroller Principle and Application Simulation Case' and 'Sensor Principle and Application' published by Tsinghua University Press, and other books in the field can be read for reference; other automation control and electrical devices not mentioned belong to the knowledge familiar to those skilled in the art, and will not be described here.

[0042] In the explanation of the application, it should be explained that the terms of nouns indicating directions are only for the convenience of description and understanding, and not for the unique limitation of the installation position of specific technical features, and other achievable installation modes are not excluded.

[0043] The serial numbers of components in the present disclosure, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present disclosure include direct and indirect connection (coupling) unless otherwise specified. In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0044] In the present disclosure, unless otherwise explicitly specified and limited, the "on" or "under" of the first feature to the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the "over", "above" and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0045] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present disclosure, and not to limit it; although the present disclosure has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A bending center front feeding device, comprising a base (10) and a feeding table (20) slidingly fitted on the top of the base, the feeding table (20) being of U-shaped structure, characterized in that: The base (10) is internally provided with a linear displacement assembly (30) for moving a feeding table (20) along its length direction, one side of the feeding table (20) is provided with a clamping and rotating assembly (40), the bottom of the clamping and rotating assembly (40) is provided with a pressure sensor, and the feeding table (20) is internally provided with a pushing assembly (50) and a thickness detection assembly (60); The thickness detection assembly (60) comprises two symmetrically arranged upper and lower laser displacement sensors (601) and (602), the upper and lower laser displacement sensors (601) and (602) are respectively fixedly installed on the top surface and the bottom surface inside the feeding table (20), and one side of the feeding table (20) near the lower laser displacement sensor (602) is provided with a light sensor (603); The upper laser displacement sensor (601) measures the distance from the top surface of the plate, the lower laser displacement sensor (602) measures the distance from the bottom surface of the plate, the measurement values of the upper and lower laser displacement sensors (601) and (602) are read by a PLC controller to obtain the corresponding distances, and the thickness of the plate is the distance between the upper and lower laser displacement sensors (601) and (602) minus the distance from the upper and lower laser displacement sensors (601) and (602) to the plate.

2. A center feed apparatus for bending a sheet metal part as set forth in claim 1, further comprising: The pushing assembly (50) comprises: A 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), and the clamping and rotating assembly (40) is used for clamping a part of the plate flush with the top of the support frame (501); A synchronous wheel (502) is rotatably installed on the bottom of the inner wall of the feeding table (20) through a shaft; A synchronous belt (503) is drivingly connected between the two synchronous wheels (502); A first driving motor (504) is fixedly installed in the feeding table (20) through a motor bracket, and the output shaft of the first driving motor (504) is coaxially fixedly connected with the shaft located on the inner side of the feeding table (20); A sliding table (505) is slidingly installed in the installation groove (201), and the front surface of the sliding table (505) is fixedly connected with the synchronous belt (503); A pushing table (506) is fixedly installed on the upper end of the sliding table (505), and the pushing table (506) is located between the two support frames (501).

3. A bending center front feeder apparatus according to claim 2, characterized in that: The clamping and rotating assembly (40) comprises a lifting driving assembly (70), a clamping and rotating machine (401) arranged outside the lifting driving assembly (70), an upper clamping piece (402) arranged at the bottom of the clamping and rotating machine (401), a lower clamping piece (4021) arranged opposite to the upper clamping piece (402), and a rotating motor (403) for driving the lower clamping piece (4021) to rotate, a support platform (404) fixedly arranged at the lower part of the opening side of the feeding table (20), the rotating motor (403) is fixedly arranged on the top surface of the support platform (404), and the pressure sensor is arranged between the rotating motor (403) and the support platform (404) for detecting the change of the pressure borne by the rotating motor (403), and the lifting driving assembly (70) is fixedly arranged at the upper part of the opening side of the feeding table (20).

4. A bending center front feeder apparatus according to claim 3, characterized in that: The lifting driving assembly (70) comprises a mounting frame (701) fixedly arranged on the top of the feeding table (20), a second driving motor (702) fixedly arranged at the outer end of the mounting frame (701), a first screw rod (703) coaxially fixedly arranged at the output end of the second driving motor (702), a vertically arranged sliding groove (704) fixedly arranged at the upper part of one side of the feeding table (20), a sliding block slidingly and fitly arranged in the sliding groove (704), a bracket (705) fixedly arranged at the outer end of the sliding block, the bracket (705) threadedly cooperates with the first screw rod (703), and the bracket (705) is fixedly connected with the outer side of the clamping and rotating machine (401).

5. A bending center front feeder apparatus according to claim 4, characterized in that: The upper part of the feeding table (20) is fixedly arranged with a protective cover (80), and the lifting driving assembly (70) is located in the protective cover (80).

6. A center feed apparatus for bending a sheet metal part as set forth in claim 1, further comprising: The linear displacement assembly (30) comprises a third driving motor (301) and a second screw rod (302) coaxially fixedly connected with the third driving motor (301), the third driving motor (301) is fixedly arranged on one side of the base (10), a push block (303) is slidingly and fitly arranged in the base (10), the second screw rod (302) transversely penetrates through the push block (303) and threadedly cooperates with the push block (303), and the upper end of the push block (303) is fixedly connected with the bottom of the feeding table (20).

7. A bending center front loading apparatus as claimed in claim 6, wherein: The top surface of the base (10) is fixedly arranged with T-shaped sliding rails (304) on both sides, and the front and rear sides of the feeding table (20) are fixedly arranged with a plurality of sliding seats (305) slidingly cooperating with the T-shaped sliding rails (304).

8. A center feed apparatus for bending a sheet metal part as set forth in claim 1, further comprising: The front and rear sides of the base (10) are fixedly arranged with a plurality of evenly distributed mounting seats (101).

9. A center feed apparatus for bending a sheet metal part as set forth in claim 2, further comprising: Two supporting frames (501) are fixedly arranged with two limit rods (507) symmetrically arranged front and back, L-shaped connecting rods are fixedly arranged at the two ends of the limit rods (507), the L-shaped connecting rods are fixedly connected with the supporting frames (501) on the same side, sliding sleeves (508) are fixedly arranged on the front and rear sides of the sliding table (505), and the limit rods (507) penetrate through the corresponding sliding sleeves (508) and slidingly cooperate with the sliding sleeves (508).

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