Bending center feeding device

Abstract

The utility model relates to the technical field of bending center feeding, in particular to a bending center feeding device which is characterized in that a pressing arm frame is movably arranged on a feeding base, the pressing arm frame can move in the horizontal transverse direction, and a feeding lower supporting assembly and a feeding upper pressing assembly are connected to the pressing arm frame; the lower feeding supporting assembly comprises a lifting table, the lifting table can move in the vertical direction, a first rotary driving assembly is installed on the lifting table and connected with a lower supporting rod, the axis of the lower supporting rod is vertically arranged, the first rotary driving assembly can drive the lower supporting rod to rotate around the axis, and a first supporting chuck is arranged at the top end of the lower supporting rod; the feeding upper pressing assembly comprises an upper supporting rod, the upper supporting rod is vertically arranged, the upper supporting rod and the lower supporting rod are coaxial, and the upper supporting rod can move in the vertical direction. The lower supporting rod can vertically move up and down and can be matched with the upper supporting rod to enable a plate to move up and down, and the situation that the plate with the edge bent downwards cannot be returned and rotated is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bending center feeding technology field, concretely relates to a bending center feeding device. BACKGROUND

[0002] The bending center feeding device is used for moving the plate to the bending center, feeding the edge of the plate to be bent into the upper and lower pressing knives, and tightly attaching the lower surface of the plate to the upper surface of the lower pressing knife.

[0003] For example, the patent with the publication number CN116809787 discloses a bending machine clamping rotary feeding device with a pushing mechanism, the bed body of the machine tool is a C-shaped structure, the clamping rotary mechanism includes a lower clamp and an upper clamp, the lower clamp is installed on the top of the lower pressing rod, the upper clamp is installed on the top of the upper pressing rod, the lower pressing rod can rotate around the axis under the drive of the main material rotating motor, the upper pressing rod can rotate around the axis under the drive of the auxiliary material rotating motor, the upper clamp moves downward to clamp the plate together with the lower clamp, the plate is fed into the bending machine through the movement of the bed body, and the plate can be rotated through the synchronous rotation of the main material rotating motor and the auxiliary material rotating motor.

[0004] However, the height of the lower clamp in the above-mentioned device and most of the bending center feeding devices is constant during work, that is, the height of the plate is constant, which causes the downward bent edge to interfere with the lower pressing knife after the upper bending knife moves downward to bend the edge of the plate, resulting in the plate being unable to retreat or rotate, and manual retreat or the bending machine to complete the complete bending is required, which affects the work efficiency. UTILITY MODEL CONTENTS

[0005] To solve the technical problem that the height of the lower clamp in most of the existing bending center feeding devices is constant during work, that is, the height of the plate is constant, which causes the downward bent edge to interfere with the lower pressing knife after the edge of the plate is bent downward, resulting in the plate being unable to retreat or rotate, manual retreat or the bending machine to complete the complete bending, and affecting the work efficiency, the utility model provides a bending center feeding device.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0007] The bending center feeding device comprises a feeding base, a pressing arm frame movably arranged on the feeding base, the pressing arm frame being movable along a horizontal transverse direction on the feeding base, a feeding lower support assembly and a feeding upper pressing assembly connected to the pressing arm frame; the feeding lower support assembly comprises a lifting table movably arranged on the pressing arm frame, the lifting table being movable along a vertical direction on the pressing arm frame, the lifting table being provided with a rotary drive assembly one, the rotary drive assembly one being connected with a lower support rod, the axis of the lower support rod being arranged vertically, the rotary drive assembly one being capable of driving the lower support rod to rotate around the axis, and the top end of the lower support rod being provided with a support chuck one; the feeding upper pressing assembly comprises an upper support rod, the axis of the upper support rod being arranged vertically, the upper support rod being arranged above the lower support rod, the upper support rod being coaxially arranged with the lower support rod, the upper support rod being movable along the vertical direction and being capable of synchronously rotating around the axis with the lower support rod, and the bottom end of the upper support rod being provided with a support chuck two.

[0008] With the above structure, the feeding lower support assembly comprises the lifting table movable vertically along the pressing arm frame, when the edge of the plate is bent downward by the upper bending knife, the lifting table can drive the lower support rod, the support chuck one and the plate to move vertically upward as a whole, so that the bent edge is away from the lower pressing knife, the problem that the bent edge interferes with the lower pressing knife to cause the plate to be unable to be retracted and rotated is solved, manual retraction or knife replacement of the bending machine is not needed, and the work efficiency is greatly improved.

[0009] The upper support rod and the lower support rod are coaxially arranged and synchronously rotatable around the axis, and in cooperation with the clamping action of the support chuck two and the support chuck one on the plate, the plate can be precisely rotated, and the multi-directional bending requirement is met. The pressing arm frame is movable along the horizontal transverse direction on the feeding base, and can drive the feeding lower support assembly and the feeding upper pressing assembly clamping the plate to move transversely as a whole, so that the plate can be precisely fed into the bending center, the automatic feeding is realized, and the manual operation error is reduced.

[0010] As a preferred implementation manner of the bending center feeding device, the lower portion of the lifting table is provided with a support base plate, the support base plate is arranged on the pressing arm frame, the lower surface of the lifting table is parallel to the upper surface of the support base plate, and the lower surface of the lifting table can abut against the upper surface of the support base plate.

[0011] With the above structure, the support base plate arranged on the pressing arm frame is arranged below the lifting table, the lower surface of the lifting table can abut against the upper surface of the support base plate after the lifting table completes the lifting action, the support base plate can provide stable support for the lifting table, the lifting table is prevented from shaking or vibrating due to force when the lower support rod drives the plate to rotate, and the rotation process of the plate is ensured to be stable. In addition, the lower surface of the lifting table and the upper surface of the support base plate are leveled and kept parallel in advance, the lifting table is precisely attached to the support base plate after each reset, the lower support rod is ensured to be always in the vertical state, the lifting table is prevented from being inclined to cause the lower support rod to deviate, the height position and the rotation track accuracy of the plate are ensured, and the bending quality is improved.

[0012] As a preferred implementation of the bending center feeding device, the support seat plate is provided with two, and the two support seat plates are respectively connected to the longitudinal two sides of the pressing arm frame.

[0013] With the above structure, the lifting platform support stability is further enhanced, the inclination of the lifting platform due to uneven stress is avoided, and the plate processing precision is ensured.

[0014] As a preferred implementation of the bending center feeding device, the rotating drive assembly one includes a speed reducer one, the speed reducer one is connected with the bottom end of the lower support rod, the speed reducer one is connected with the servo motor one, and the speed reducer one is located above the servo motor one.

[0015] With the above structure, the rotating drive assembly one includes the servo motor one and the speed reducer one, the servo motor one has the characteristics of controllable rotating speed and accurate positioning, the rotating speed and rotating angle of the lower support rod can be accurately controlled by adjusting the output rotating speed and rotating angle of the servo motor one, the requirements of different bending angles of the plate are met; the speed reducer one is connected with the bottom end of the lower support rod, which can convert the high rotating speed of the servo motor one into the low rotating speed and high torque required by the lower support rod, ensuring sufficient power when the lower support rod drives the plate to rotate, and avoiding the plate from being unable to rotate due to excessive resistance. In addition, the speed reducer one is located above the servo motor one, which can shorten the connection distance between the speed reducer one and the lower support rod, reduce the energy loss in the transmission process, avoid the servo motor one directly bearing the axial pressure of the lower support rod, prolong the service life of the servo motor one, and ensure the long-term stable operation of the rotating drive assembly one.

[0016] As a preferred implementation of the bending center feeding device, a reinforcing member is installed on the lifting platform, the lower support rod vertically penetrates the reinforcing member, and a rotating bearing one is arranged inside the reinforcing member.

[0017] With the above structure, the reinforcing member installed on the lifting platform is internally provided with the rotating bearing one, and the outer periphery of the lower support rod is connected with the inner ring of the rotating bearing one, which can provide radial support for the lower support rod, avoid the downward pressure acting on the lower speed reducer one when the feeding and pressing assembly is pressed down, and avoid damaging the speed reducer one or affecting the service life of the speed reducer one. At the same time, the radial deviation of the lower support rod during rotation (such as the weight of the plate and the rotating centrifugal force) is avoided, the rotation of the lower support rod around its own axis is ensured, and the accuracy of the plate rotation track is ensured.

[0018] As a preferred implementation of the bending center feeding device, the speed reducer one is installed on the top of the lifting platform, and the servo motor one is installed on the bottom of the lifting platform.

[0019] With the above structural scheme, the speed reducer one is installed on the top of the lifting platform, directly connected with the bottom end of the lower supporting rod, shortening the transmission path; the servo motor one is installed on the bottom of the lifting platform, distributed above and below the speed reducer one, fully utilizing the up and down space of the lifting platform, avoiding the rotary driving assembly one occupying too much space in the horizontal direction, making the whole feeding and lower supporting assembly structure more compact, adapting to the limited installation space of the bending center. In addition, the servo motor one is located at the bottom of the lifting platform, far away from the feeding and upper pressing assembly and the bending area, not easy to be affected by the debris and oil stains generated during the bending process, and when maintaining, the feeding and upper pressing assembly or the lower supporting rod does not need to be disassembled, the servo motor one can be directly overhauled, reducing the maintenance difficulty and cost; the speed reducer one is located on the top of the lifting platform, close to the lower supporting rod, facilitating the observation of the transmission state and timely discovery of transmission failure.

[0020] As a preferred implementation manner of the bending center feeding device, the side of the lifting platform facing the pressing arm frame is provided with a screw nut, the screw nut is threadedly connected with a threaded screw, the axis of the threaded screw is vertically arranged, the bottom end of the threaded screw is connected with a rotary driving assembly two, the rotary driving assembly two can drive the threaded screw to rotate around the axis, and the rotary driving assembly two is installed on the pressing arm frame.

[0021] With the above structural scheme, first, the lifting platform is threadedly connected with the threaded screw through the screw nut, the threaded screw is driven to rotate by the rotary driving assembly two, the high precision characteristic of the screw drive is utilized, the rotation angle of the threaded screw can be accurately controlled by controlling the rotation number and rotation speed of the rotary driving assembly two, the screw nut (and the lifting platform) is driven to move along the vertical direction, the height of the plate is accurately adjusted, and the needs of different thicknesses of the plate or different bending depths are met. Second, the screw drive has the characteristics of stable transmission and strong impact resistance, during the lifting of the plate by the lifting platform, the lifting platform can be prevented from shaking due to unstable transmission, the position of the plate during the height adjustment process is ensured to be stable, and the bending precision is prevented from being affected by the deviation of the plate; meanwhile, the self-locking property of the threaded screw can enable the lifting platform to be stably stopped at any height position, without the need of an additional locking mechanism, simplifying the structure and ensuring safety.

[0022] As a preferred implementation manner of the bending center feeding device, the side of the lifting platform facing the pressing arm frame is provided with a sliding block, the sliding block is slidingly connected with a sliding rail, the sliding rail extends along the vertical direction, and the sliding rail is installed on the pressing arm frame.

[0023] With the above structural design, a slider is provided on the side of the lifting platform facing the pressure arm frame. The slider is slidably connected to a slide rail extending vertically. The slide rail provides a fixed trajectory for the movement of the slider (and the lifting platform), restricting the lifting platform to move only in the vertical direction. This prevents horizontal deviation of the lifting platform during lifting due to screw transmission errors or force, ensuring accurate movement of the lifting platform. Furthermore, the cooperation between the slider and the slide rail can distribute the radial pressure of the lifting platform and sheet metal on the screw nut and threaded screw, preventing the threaded screw from bending or deforming due to long-term radial force, thus extending the service life of the screw transmission components. Simultaneously, the sliding cooperation between the slide rail and the slider reduces resistance during the movement of the lifting platform, making the lifting process smoother.

[0024] As a preferred implementation of a bending center feeding device, the lifting platform is located on one side of the horizontal transverse direction of the pressure arm frame. The lifting platform includes a horizontal bearing plate and a vertical bearing plate. The surface of the vertical bearing plate is arranged along the horizontal longitudinal direction, and the screw nut is installed on the side of the vertical bearing plate facing the pressure arm frame.

[0025] The above structural design includes a horizontal support plate and a vertical support plate. The horizontal support plate is used to install components such as the rotary drive assembly and the lower support rod, and can provide a stable horizontal support surface to ensure that the lower support rod is installed vertically.

[0026] As a preferred implementation of a bending center feeding device, the rotary drive assembly two includes a motor base, which is mounted on the pressure arm frame. A rotary bearing two is provided inside the motor base. The outer circumferential surface of the bottom end of the threaded screw is a smooth circular surface. The outer circumferential surface of the bottom end of the threaded screw is connected to the inner ring of the rotary bearing two, and the bottom end of the threaded screw passes through the rotary bearing two. The bottom end of the threaded screw is connected to a reducer two through a coupling. The reducer two is connected to a servo motor two.

[0027] The above structural design has several advantages. First, the motor housing of the rotary drive assembly two includes a second rotary bearing. The outer circumferential surface (smooth circular surface) of the bottom end of the threaded screw is connected to the inner ring of the second rotary bearing. The second rotary bearing provides radial support to the bottom end of the threaded screw, preventing radial swaying or bending due to force on the top end (weight of the lifting platform and sheet metal) during rotation. This ensures the threaded screw always rotates along its own axis, improving the screw transmission accuracy. Second, the bottom end of the threaded screw is connected to the second reducer via a coupling. The second reducer is connected to the second servo motor. The second servo motor provides precise speed and torque control, while the second reducer converts the high speed of the second servo motor into the low speed and high torque required by the threaded screw. This ensures sufficient power when the threaded screw drives the lifting platform, while preventing the second servo motor from directly bearing the axial force of the threaded screw, extending its service life. The coupling compensates for installation errors between the threaded screw and the output shaft of the second reducer, reducing vibration and impact during transmission and ensuring smooth transmission.

[0028] The beneficial effects of the utility model include:

[0029] The feeding lower support assembly comprises a lifting table vertically movable along the pressing arm frame, when the plate material edge is downward bent by the upper bending knife, the lifting table can drive the lower support rod, the support chuck one and the plate material to vertically move upward as a whole, so that the bent edge is away from the lower pressing knife, the problem that the bent edge interferes with the lower pressing knife to cause the material to be unable to be withdrawn and rotated is solved, manual material withdrawal or bending machine knife replacement is not needed, and the work efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed to be used in the description will be simply introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the drawings for the ordinary skilled in the art without paying creative labor.

[0031] Figure 1 It is a perspective structural schematic view of a bending center feeding device in the specific embodiment of the utility model;

[0032] Figure 2 It is a sectional structure schematic view of a bending center feeding device in the specific embodiment of the utility model;

[0033] Figure 3 It is a side surface structure schematic view of a bending center feeding device in the specific embodiment of the utility model.

[0034] Component and drawing mark list:

[0035] 1, feeding base; 2, pressing arm frame;

[0036] 3, feeding lower support assembly;

[0037] 31, lifting table; 311, horizontal bearing plate; 312, vertical bearing plate; 313, reinforcing member;

[0038] 32, rotating drive assembly one; 321, speed reducer one; 322, servo motor one; 323, rotating bearing one;

[0039] 33, lower support rod; 34, support chuck one; 35, support seat plate; 36, screw nut; 37, threaded screw;

[0040] 38, rotating drive assembly two; 381, motor base; 382, rotating bearing two; 383, coupling; 384, speed reducer two; 385, servo motor two;

[0041] 39, sliding block; 310, sliding rail;

[0042] 4, feeding upper pressing assembly; 41, upper support rod; 42, support chuck two. DETAILED DESCRIPTION

[0043] In order to make the purpose, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions of the present application will be described clearly and completely in combination with the drawings in the specific embodiments. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] Referring to Figure 1 A bending center feeding device, comprising a feeding base 1, a pressing arm frame 2 is movably arranged on the feeding base 1, the pressing arm frame 2 is C-shaped, the pressing arm frame 2 can advance and retreat in a horizontal transverse direction on the feeding base 1, and a feeding lower support assembly 3 and a feeding upper pressing assembly 4 are connected to the pressing arm frame 2 in the advancing direction.

[0045] Referring to Figures 1-3 The feeding lower support assembly 3 comprises a lifting platform 31 movably installed on one side of the pressing arm frame 2 in the transverse direction, the lifting platform 31 comprises a horizontal bearing plate 311 and a vertical bearing plate 312, the plate surface of the vertical bearing plate 312 is arranged in a horizontal longitudinal direction, and the horizontal longitudinal direction is a horizontal direction perpendicular to the moving direction of the pressing arm frame. A rotary drive assembly one 32 is installed on the horizontal bearing plate 311, the rotary drive assembly one 32 comprises a speed reducer one 321, the speed reducer one 321 is installed on the top of the horizontal bearing plate 311, the speed reducer one 321 is connected with the bottom end of a lower support rod 33, the axis of the lower support rod 33 is vertically arranged, and a support chuck one 34 is arranged at the top end of the lower support rod 33. The speed reducer one 321 is connected with a servo motor one 322, and the servo motor one 322 is installed on the bottom of the horizontal bearing plate 311. A reinforcing member 313 is installed on the plate surface of the vertical bearing plate 312 away from the pressing arm frame 2, the lower support rod 33 vertically penetrates through the reinforcing member 313, a rotating bearing one 323 is arranged inside the reinforcing member 313, and the outer periphery of the lower support rod 33 is connected with the inner ring of the rotating bearing one 323.

[0046] Referring to Figure 2, the lifting platform 31 can move along the vertical direction on the pressing arm frame 2. The vertical bearing plate 312 of the lifting platform 31 is provided with a screw nut 36 on the side plate surface facing the pressing arm frame 2, the screw nut 36 is threadedly connected with a threaded screw 37, the axis of the threaded screw 37 is vertically arranged, the bottom end of the threaded screw 37 is connected with a rotary drive assembly two 38, the rotary drive assembly two 38 is installed on the pressing arm frame 2, and the rotary drive assembly two 38 can drive the threaded screw 37 to rotate around the axis. The vertical bearing plate 312 of the lifting platform 31 is also provided with a sliding block 39 on the side plate surface facing the pressing arm frame 2, the sliding block 39 is slidably connected with a sliding rail 310, the sliding rail 310 extends along the vertical direction, and the sliding rail 310 is installed on the pressing arm frame 2.

[0047] With reference to Figure 2 , the rotary drive assembly two 38 comprises a motor base 381, the motor base 381 is installed on the pressing arm frame 2, the motor base 381 is internally provided with a rotating bearing two 382, the bottom end of the threaded screw 37 has a smooth circumferential surface, the bottom end of the threaded screw 37 is connected with the inner ring of the rotating bearing two 382, and the bottom end of the threaded screw 37 penetrates through the rotating bearing two 382, the bottom end of the threaded screw 37 is connected with a speed reducer two 384 through a shaft coupling 383, and the speed reducer two 384 is connected with a servo motor two 385. The shaft coupling 383 in the embodiment is a diaphragm elastic shaft coupling, which allows axial, radial and angular displacement compensation, absorbs vibration through a stainless steel diaphragm, and runs stably and silently.

[0048] With reference to Figure 1 and Figure 3 , the lifting platform 31 is provided with a support seat plate 35 below the horizontal bearing plate 311, the support seat plate 35 is installed on the pressing arm frame 2, the lower surface of the lifting platform 31 is parallel to the upper surface of the support seat plate 35, and the lower surface of the lifting platform 31 can abut against the upper surface of the support seat plate 35. The support seat plate 35 is provided with two, and the two support seat plates 35 are respectively connected to the longitudinal two sides of the pressing arm frame 2.

[0049] With reference to Figures 1-3 , the feeding and upper pressing assembly 4 comprises an upper support rod 41, the axis of the upper support rod 41 is vertically arranged, the upper support rod 41 is located above the lower support rod 33, the upper support rod 41 is coaxially arranged with the lower support rod 33, the upper support rod 41 can move along the vertical direction, and the upper support rod 41 can synchronously rotate around the axis with the lower support rod 33, and the bottom end of the upper support rod 41 is provided with a support chuck two 42. The synchronous rotation of the upper support rod 41 and the lower support rod 33 and the vertical movement of the upper support rod 41 are all prior arts.

[0050] Working principle:

[0051] After the plate is conveyed to the upper surface of the support chuck two 42, the plate is calibrated, and then the upper support rod 41 moves downward along the vertical direction until the lower surface of the support chuck two 42 is attached to the upper surface of the plate. The upper support rod 41 continues to apply a preset pressure, and cooperates with the support chuck one 34 to clamp the plate. At this time, the plate is fixed and clamped to avoid deviation during subsequent movement or rotation.

[0052] The pressing arm frame 2 moves horizontally along the feeding base 1 (towards the bending center direction) to drive the clamped plate to move synchronously until the edge of the plate to be bent is sent into the bending center.

[0053] The upper pressing beam and the lower pressing beam of the bending center act to clamp the plate (the lower surface of the plate is attached to the upper surface of the lower pressing knife), and at this time, the support chuck two 42 and the support chuck one 34 of the device keep the clamping state of the plate to assist the bending center in fixing the position of the plate.

[0054] After the process of bending the edge of the plate upward according to the prior art is completed, the support chuck two 42 and the support chuck one 34 clamp the plate, and the rotation driving assembly one 32 is started to rotate the lower support rod 33, and the upper support rod 41 rotates synchronously, thereby rotating the plate to send the edge to be bent downward into the upper pressing knife and the lower pressing knife of the bending center.

[0055] In the subsequent downward bending step, the upper bending knife of the bending center moves downward along the vertical direction to bend the edge of the plate downward, and after the bending is completed, the upper bending knife is reset and moves upward.

[0056] Since the edge of the plate has been bent downward, if the plate is directly withdrawn or rotated, the bent edge will interfere with the lower pressing knife of the bending center. Therefore, the servo motor two 385 of the rotation driving assembly two 38 is started to drive the threaded screw rod 37 to rotate around the axis by the speed reducer two 384, the screw nut 36 drives the lifting platform 31 to move upward along the vertical direction, synchronously drives the lower support rod 33, the support chuck one 34 and the plate to move upward as a whole, and the upper support rod 41 moves upward synchronously to keep the plate clamped between the support chuck one 34 and the support chuck two 42 until the bent edge of the plate is completely away from the lower pressing knife.

[0057] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bending center feeding device, comprising a feeding base (1), a pressing arm frame (2) is movably arranged on the feeding base (1), the pressing arm frame (2) can move along a horizontal transverse direction on the feeding base (1), characterized in that, The feeding lower support assembly (3) and the feeding upper pressing assembly (4) are connected to the pressing arm frame (2); the feeding lower support assembly (3) comprises a lifting platform (31) movably installed on the pressing arm frame (2), the lifting platform (31) can move in the vertical direction on the pressing arm frame (2), the lifting platform (31) is provided with a rotary drive assembly I (32), the rotary drive assembly I (32) is connected with a lower support rod (33), the axis of the lower support rod (33) is vertically arranged, the rotary drive assembly I (32) can drive the lower support rod (33) to rotate around the axis, and the top end of the lower support rod (33) is provided with a support chuck I (34); The feeding upper pressing assembly (4) comprises an upper support rod (41), the axis of the upper support rod (41) is vertically arranged, the upper support rod (41) is located above the lower support rod (33), the upper support rod (41) is coaxially arranged with the lower support rod (33), the upper support rod (41) can move in the vertical direction, and the upper support rod (41) can synchronously rotate around the axis with the lower support rod (33), and the bottom end of the upper support rod (41) is provided with a support chuck II (42).

2. A bending center feed device according to claim 1, characterized in that The lifting platform (31) is provided with a support base plate (35) below, the support base plate (35) is installed on the pressing arm frame (2), the lower surface of the lifting platform (31) is parallel to the upper surface of the support base plate (35), and the lower surface of the lifting platform (31) can abut against the upper surface of the support base plate (35).

3. A bending center feed device according to claim 2, characterized in that The support base plate (35) is provided with two, and the two support base plates (35) are connected to the longitudinal two sides of the pressing arm frame (2) respectively.

4. The bending center feed apparatus of claim 1 wherein, The rotary drive assembly I (32) comprises a speed reducer I (321), the speed reducer I (321) is connected with the bottom end of the lower support rod (33), the speed reducer I (321) is connected with a servo motor I (322), and the speed reducer I (321) is located above the servo motor I (322).

5. A bending center feed device according to claim 4, characterized in that The lifting platform (31) is provided with a reinforcing piece (313), the lower support rod (33) vertically penetrates the reinforcing piece (313), the reinforcing piece (313) is internally provided with a rotating bearing I (323), and the outer periphery of the lower support rod (33) is connected with the inner ring of the rotating bearing I (323).

6. A bending center feed apparatus according to claim 4, wherein The speed reducer I (321) is installed on the top of the lifting platform (31), and the servo motor I (322) is installed on the bottom of the lifting platform (31).

7. The bending center feed apparatus of claim 1 wherein, The lifting platform (31) is provided with a screw nut (36) on the side facing the pressing arm frame (2), the screw nut (36) is threadedly connected with a threaded screw (37), the axis of the threaded screw (37) is vertically arranged, the bottom end of the threaded screw (37) is connected with a rotary drive assembly II (38), the rotary drive assembly II (38) can drive the threaded screw (37) to rotate around the axis, and the rotary drive assembly II (38) is installed on the pressing arm frame (2).

8. A bending center feed device according to claim 7, characterized in that The lifting platform (31) is provided with a sliding block (39) on the side facing the pressing arm frame (2), the sliding block (39) is slidably connected with a sliding rail (310), the sliding rail (310) extends in the vertical direction, and the sliding rail (310) is installed on the pressing arm frame (2).

9. A bending center feed apparatus according to claim 7, wherein The lifting platform (31) is located on one side of the horizontal transverse direction of the pressing arm frame (2), and the lifting platform (31) comprises a horizontal bearing plate (311) and a vertical bearing plate (312), the plate surface of the vertical bearing plate (312) is arranged along the horizontal longitudinal direction, and a screw nut (36) is installed on the side plate surface of the vertical bearing plate (312) facing the pressing arm frame (2).

10. The bending center feed apparatus of claim 7 wherein, The rotary drive assembly two (38) comprises a motor base (381), the motor base (381) is installed on the pressing arm frame (2), the motor base (381) is provided with a rotating bearing two (382) therein, the bottom end outer circumferential surface of the threaded screw rod (37) is a smooth circumferential surface, the bottom end outer circumferential surface of the threaded screw rod (37) is connected to the inner ring of the rotating bearing two (382), and the bottom end of the threaded screw rod (37) penetrates through the rotating bearing two (382), the bottom end of the threaded screw rod (37) is connected with a speed reducer two (384) through a shaft coupling (383), the speed reducer two (384) is connected with a servo motor two (385).

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