Composite bending production line for door pocket line

Abstract

The utility model belongs to the technical field of door pocket processing, and discloses a door pocket line composite bending production line which comprises a rack, a conveying device and a discharging device, a grooving device, a first gluing device, a rolling device, a second gluing device and a bending device are fixedly arranged on the rack, and the door pocket line composite bending production line is provided with a plate composite device. The plate compounding device is positioned above the slotting device and the first gluing device; the plate compounding device comprises a supporting plate, a feeding frame and a feeding device; a first material blocking plate is fixedly arranged at the end of the feeding frame, and a gap is formed between the first material blocking plate and the feeding frame. A first sensor used for detecting the position of the composite board is fixedly arranged on the supporting plate, and a second sensor used for detecting the position of the base plate is fixedly arranged on the rack; according to the utility model, two plates are compounded in the moving process, so that the shutdown waiting time is saved, the production efficiency is improved, the uniformity of glue is not influenced by an up-and-down compounding mode, the combination firmness of the two plates is improved, and the rejection rate is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of door cover processing, and relates to a door cover line production line, in particular to a door cover line composite bending production line. Background Art

[0002] The door frame is installed on the door opening wall to install the door or protect the corner. The door frame is divided into two parts, one is a flat door frame board that fits the door opening surface, and the other is an L-shaped door frame line that fits the wall. There are grooves on both sides of the door frame board. When installing, one side of the door frame line is inserted into the groove and the other side is attached to the wall. In order to prevent the deformation of the door frame line and meet environmental protection requirements, the current process is to composite the density board with the solid wood board, and the density board is covered on three sides of the solid wood board through a bending process. One side of the density board is aligned with the solid wood board after bending, and the other side of the density board is higher than the solid wood board after bending, protruding from the solid wood board to form an L shape.

[0003] In the prior art, the production line for realizing the above-mentioned process includes a frame, a transmission device, a grooving device, a gluing device, a compound device, a pressure roller device, and a bending device. The production process is: the density board is placed on the transmission device. During the transmission process, two grooves for bending are milled on the density board by the grooving device, and glue is applied to the grooves and the board surface of the density board. Then, the solid wood board is placed on the density board by the compound device and located between the two grooves. The solid wood board and the density board are pressed tightly by the pressure roller device. Then, the bending device bends the parts on both sides of the groove of the density board upward along the two sides of the solid wood board and fits them with the two sides of the solid wood board. Among them, the compounding device is arranged on the side of the frame for placing the solid wood board. When the density board reaches the position flush with the solid wood board along with the transmission device, the transmission device pauses, and the compounding device pushes the solid wood board from the side to the position between the two grooves of the density board for compounding. The disadvantages of this structure are: (1) the transmission device needs to be stopped, and then wait for the compounding device to push the solid wood board onto the density board, which wastes time and greatly reduces production efficiency; (2) since the density board has been brushed with glue on the compounding surface before compounding, the side push will cause the glue on the density board to move with the solid wood board, resulting in uneven glue coating on the density board (one side is thick and the other side is thin), and finally the solid wood board and the density board are not firmly bonded, resulting in a high scrap rate. Utility Model Content

[0004] In order to solve the above deficiencies in the prior art, the utility model aims to provide a door frame composite bending production line to achieve the purpose of improving production efficiency and reducing scrap rate.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A door frame composite bending production line, comprising a frame, a conveying device mounted on the frame, and a material unloading device for carrying a substrate and pushing the substrate onto the conveying device, wherein a slotting device, a first gluing device, a rolling device, a second gluing device, and a bending device are fixedly mounted on the frame in sequence, and a plate composite device is also fixedly mounted on the frame, and the plate composite device is located above the slotting device and the first gluing device;

[0007] The plate composite device comprises a support plate, a feeding rack for carrying the composite plate, and a feeding device for pushing the composite plate onto the support plate; wherein the support plate and the feeding rack are both fixedly arranged on the frame at an angle, the support plate and the feeding rack have the same angle of inclination and are connected end to end; the feeding device is fixedly arranged on the feeding rack, a first baffle plate is fixedly arranged at the end of the feeding rack, and a gap for the composite plate to pass through is arranged between the first baffle plate and the feeding rack; a first sensor for detecting the position of the composite plate is fixedly arranged on the support plate, and a second sensor for detecting the position of the substrate is fixedly arranged on the frame;

[0008] A control device is also fixedly arranged on the frame, the signal output ends of the first sensor and the second sensor are connected to the signal input end of the control device, and the signal output end of the control device is connected to the signal input end of the feeding device.

[0009] As a limitation of the present invention, one end of the feeding rack close to the support plate is rotatably connected to the frame, and the other end is fixed to the frame.

[0010] As a further limitation of the present invention, the feeding rack is fixedly provided with a plurality of first limiting devices for clinging to both sides of the composite board, the first limiting devices are located on both sides of the composite board, and the width between the first limiting devices on both sides is adjusted by the first limiting parts.

[0011] As another limitation of the present invention, a baffle is fixedly provided on one side of the support plate, and a plurality of second limiting devices for clinging to the edge of the composite plate are provided on the other side of the support plate.

[0012] As a limitation of the present utility model, the feeding device includes two sprockets rotatably arranged on a feeding rack, a chain sleeved on the two sprockets and a driving device for driving the sprockets to rotate, and two push blocks that abut against the composite plate are fixedly arranged on the chain at intervals; an opening for the push blocks to pass through is provided in the length direction of the feeding rack.

[0013] As a further limitation of the present utility model, the unloading device includes a unloading table, a cylinder fixed on the unloading table, a slide rail fixed on the unloading table and a slider slidably arranged on the slide rail, the telescopic end of the cylinder is fixedly connected to the slider, and the slider is fixedly provided with a push plate that abuts against the substrate; a second material baffle plate is fixedly provided at the end of the unloading table, and a gap is provided between the second material baffle plate and the surface of the unloading table for the substrate to pass through.

[0014] As a further limitation of the present invention, the unloading platform is fixedly provided with a limit plate for limiting the position of two sides of the substrate, wherein one side of the limit plate is adjustably arranged on the unloading platform through a long hole.

[0015] As a further limitation of the present invention, the first limiting device is a vertical plate, the first limiting portion is a first long through hole provided on the feeding rack, and the vertical plate is detachably provided on the first long through hole.

[0016] As a limitation of the present invention, the second limiting device is a roller rotatably arranged on the frame, and the rolling direction of the roller is the same as the moving direction of the composite plate.

[0017] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0018] (1) The utility model arranges the plate compounding device above the conveying device. When the base plate moves to the position where it is flush with the compound plate, the two are combined up and down and move in the same direction at the same time. The conveying device does not need to stop to wait for the compound plate and the base plate to be combined. The two can be compounded while moving in parallel, which reduces the compounding time and greatly improves the production efficiency. When the two are compounded, the ends first contact up and down, and the compound plate is completely attached to the base plate from top to bottom as it moves. The two will not produce relative movement, which avoids the composite plate from scratching the glue, ensures the uniformity of the glue coating, improves the firmness of the combination of the two, and reduces the scrap rate.

[0019] (2) One end of the feed rack of the utility model is rotatably connected to the frame, which facilitates the adjustment of the inclination angle of the feed rack during installation, making it more convenient to use;

[0020] (3) The first limiting device of the utility model can limit the position of the composite plate on both sides of the feeding rack to prevent the composite plate from shifting, improve the accuracy of the composite plate with the base plate, and at the same time can adjust the width according to different sizes, which is highly practical;

[0021] (4) The second limiting device of the utility model can limit the position of the two sides of the composite plate on the support plate to prevent the composite plate from deviating and improve the accuracy of the composite plate with the base plate. The structure of the roller can reduce the friction with the side of the composite plate, and the position of the roller can be adjusted according to the width of the plate, which is more practical.

[0022] (5) The feeding device of the utility model pushes the material by means of a sprocket chain, and the reciprocating process is easy to control. In addition, two push blocks are arranged on the chain, which can reduce the idle time of the chain, save energy and improve efficiency;

[0023] (6) The telescopic end of the cylinder of the unloading device of the utility model is fixedly connected to the slide block. During the extension and retraction of the cylinder, the slide block can move along the slide rail, and can support the end of the telescopic rod of the cylinder, thereby improving the stability of the movement.

[0024] In summary, the utility model compounds two plates during the movement process, which saves the downtime and waiting time, improves the production efficiency, and the upper and lower compounding method will not affect the uniformity of the glue, improves the firmness of the combination of the two, reduces the scrap rate, and is suitable for the production of door frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of a door casing according to an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the main structure of the blanking device of the utility model embodiment;

[0029] Figure 4 This is a schematic diagram of the top view of the blanking device of an embodiment of the utility model;

[0030] Figure 5 This is a schematic diagram of the front view of the feeding device of Example 1 of the present invention, which is assembled on the feeding rack;

[0031] Figure 6 This is a schematic top view of the structure of the feeding device of Example 1 of the present invention mounted on the feeding rack;

[0032] Figure 7 It is a schematic cross-sectional structure diagram of the installation of the support plate and the roller according to an embodiment of the utility model.

[0033] In the figure: 1, frame; 2, conveying device; 3, unloading device; 4, slotting device; 5, first gluing device; 6, plate compounding device; 7, rolling device; 8, second gluing device; 9, bending device; 10, control device; 11, substrate; 12, compound plate;

[0034] 31. Unloading table; 32. Cylinder; 33. Slide rail; 34. Sliding block; 35. Push plate; 36. Second baffle plate; 37. Limit plate; 38. Long hole;

[0035] 601, feeding rack; 602, supporting plate; 603, opening; 604, frame; 605, rotating shaft; 606, connecting block; 607, first baffle plate; 608, vertical plate; 609, first long through hole; 610, sprocket; 611, chain; 612, pushing block; 613, baffle plate; 614, roller. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0037] Example: Door frame composite bending production line

[0038] like Figure 1 As shown, this embodiment includes a frame 1, a conveying device 2 and a feeding device 3. The conveying device 2 is mounted on the frame 1 and adopts a conveying wheel structure commonly used in the plate processing field. The feeding device 3 is used to carry the substrate 11. The feeding device 3 is located at the end of the frame 1 and is used to push the substrate 11 onto the conveying device 2. The frame 1 is provided with a width adjustment device, which is used to abut against one side of the substrate 11, that is, the width adjustment device is provided with a row of rotating wheels that fit the edge of the substrate 11. The rotating wheels move through the adjustment device to adapt to substrates 11 of different widths. The above is the prior art, and the invention of this application is not hereby, and will not be elaborated in detail. The frame 1 is fixed with a slotting device 4, a first glue coating device 5, a rolling device 7, a second glue coating device 8 and a bending device 9 in sequence. The frame 1 is also fixed with a plate compounding device 6, which is used to carry a composite board 12 compounded with the substrate 11. In this embodiment, the substrate 11 is a density board, and the composite board 12 is a solid wood board. A brush device is fixed behind the slotting device 4 to remove wood chips after slotting. As the substrate 11 moves on the conveyor 2, it is successively grooved, coated with glue on the surface, composited with the composite board 12, extruded by the roller pressing device 7, coated with glue in the groove and on the side of the composite board 12, and the parts on both sides of the groove of the substrate 11 are bent upward by 90 degrees to fit with the two sides of the composite board 12, and finally an L-shaped composite door frame is formed. Figure 2 As shown, one side of the formed door frame is the same height as the composite solid wood board, and the other side protrudes from the solid wood board to form an L shape.

[0039] like Figure 3As shown, the unloading device 3 includes a material unloading platform 31, a cylinder 32 fixed on the material unloading platform 31, a slide rail 33 fixed on the material unloading platform 31, and a slider 34 slidably arranged on the slide rail 33. The cylinder 32 and the slide rail 33 are both fixed on the side of the material unloading platform 31, and the telescopic end of the cylinder 32 is fixedly connected to the slider 34. The slider 34 is used to support the end of the telescopic end of the cylinder 32 to improve the stability of the movement of the cylinder 32. A push plate 35 is fixedly provided on the slider 34, and multiple layers of substrates 11 can be placed on the unloading table 31. The push plate 35 abuts against the bottom substrate 11 and is used to drive the bottom substrate 11 to move to the conveying device 2. The stroke of the cylinder 32 only drives the bottom substrate 11 to move to the conveying device 2, and then the conveying device 2 drives the substrate 11 to move. When the cylinder 32 drives the push plate 35 to move toward the conveying device 2, the push plate 35 is always located below the second-to-last substrate 11. When the cylinder 32 drives the push plate 35 to return and move to the right side of the substrate 11, the second-to-last substrate 11 falls on the unloading table 31 and abuts against the push plate 34 after the return. In order to ensure that the upper substrate 11 does not move when the bottom substrate 11 is pushed, a second baffle plate 36 is fixedly provided at the end of the unloading table 31, and a gap for the substrate 11 to pass through is provided between the second baffle plate 36 and the table surface of the unloading table 31, and the gap is slightly larger than the thickness of one substrate 11. The extension and contraction of the cylinder 32 drives the push plate 35 on the slider 34 to move, and the movement of the push plate 35 drives the bottom substrate 11 to move, and the remaining substrates 11 are blocked by the second baffle plate 36. When the bottom substrate 11 is pushed out, the upper substrate 11 falls due to gravity.

[0040] like Figure 4 As shown, in order to prevent the substrate 11 from shifting on the unloading platform 31, two rows of limit plates 37 are fixed on the unloading platform 31. The limit plate 37 on the same side as the cylinder 32 is located at the position of the cylinder barrel and will not affect the movement of the push plate 35. The limit plate 37 on the other side is adjustable on the unloading platform 31. The position of the unloading platform 31 corresponding to the limit plate 37 is provided with a long hole 38. The length direction of the long hole 38 is set along the width direction of the unloading platform 31. The limit plate 37 is detachably set on the long hole 38 by bolts. The position of the limit plate 37 on the side on the long hole 38 can be adjusted to adapt to substrates 11 of different widths, so that the limit plates 37 on both sides are tightly attached to both sides of the substrate 11.

[0041] like Figure 1As shown, the plate composite device 6 is fixed on the frame 1 and is located directly above the slotting device 4 and the first glue coating device 5, so that the composite plate 12 falls from above onto the substrate 11 without scratching the glue on the substrate 11. The plate composite device 6 includes a support plate 602, a feeding rack 601 and a feeding device, wherein the support plate 602 and the feeding rack 601 are both used to carry the composite plate 12, and multiple composite plates 12 can be placed. The support plate 602 and the feeding rack 601 are both tilted and fixed on the frame 1, and the inclination of the two is the same, and the end is connected. The feeding device is fixed on the feeding rack 601, and is used to push the composite plate 12 from the feeding rack 601 to the support plate 602, so the feeding rack 601 has a certain thickness, resulting in that the tilted end of the feeding rack 601 cannot be too close to the frame 1. Through the connection of the support plate 602, it is convenient for the composite plate 12 to be composited with the substrate 11 at a position close to the substrate 11.

[0042] like Figure 5 , Figure 6 As shown, the feed rack 601 is a rectangular box-shaped structure, and an opening 603 is provided in the length direction of the top surface, and the opening 603 extends to the front and rear, and the opening 603 is located in the middle of the top surface. One end of the feed rack 601 close to the support plate 602 is rotatably connected to the frame 1, specifically, a frame body 604 is fixed on the frame 1, a rotating shaft 605 is rotatably set on the frame body 604, and then one end of the feed rack 601 is fixed to the rotating shaft 605 through a connecting block 606, and the inclination angle of the feed rack 601 and the frame 1 is adjusted by rotating the rotating shaft 605. The other end of the feed rack 601 is fixed to the frame 1 through a vertical rod, and the position of the end is adjusted accordingly by adjusting the angle.

[0043] like Figure 6 As shown, a first stopper plate 607 is fixedly provided at one end of the feed rack 601 close to the support plate 602, and the first stopper plate 607 spans across the opening 603, so that a gap is provided between the first stopper plate 607 and the feed rack 601, and the gap is slightly larger than the thickness of the composite board 12, and one composite board 12 can pass through. Two rows of first position limiting devices are fixedly provided on the feed rack 601, and the first position limiting devices are vertical plates 608, and multiple vertical plates 608 are arranged at intervals. The first position limiting devices are located on both sides of the composite board 12, and are used to close the two sides of the composite board 12 to prevent the composite board 12 from shifting during movement. A first limiting portion is provided on both sides of the feeding rack 601. The first limiting portion is a first long through hole 609 arranged along the width direction of the feeding rack 601. A screw is provided at the bottom of the vertical plate 608. The screw passes through the first long through hole 609 and is detachably arranged on the first long through hole 609 through a nut. By adjusting the position of the vertical plate 608 on the first long through hole 609, the two rows of vertical plates 608 can limit the composite plates 12 of different widths, which is convenient for adjusting the width between the first limiting devices on both sides, and has strong versatility.

[0044] like Figure 5As shown, the feeding device includes two sprockets 610 rotatably arranged on a feeding rack 601, a chain 611 sleeved on the two sprockets 610, and a driving device for driving the sprockets 610 to rotate, the chain 611 is located below the opening 603 of the feeding rack 601, and two push blocks 612 are fixedly arranged on the chain 611 at intervals, and the two push blocks 612 both pass through the opening 603 and extend to the outside, and can abut against the bottom layer of the composite board 12. As the chain 611 rotates, the push blocks 612 drive the bottom layer of the composite board 12 to move along the feeding rack 601.

[0045] like Figure 7 As shown, a baffle 613 is fixedly arranged on one side of the support plate 602 so that the support plate 602 forms an L shape, and a second stopper for close contact with the edge of the composite board 12 is fixedly arranged on the other side. The second stopper is a roller 614 rotatably arranged on the frame 1. A plurality of vertical rods are fixedly arranged on the width adjustment device of the frame 1. The roller 614 is rotatably arranged on the vertical rod. The rolling direction of the roller 614 is the same as the movement direction of the composite board 12. A plurality of rollers 614 are arranged at intervals to block the edge of the composite board 12 and prevent the composite board 12 from deflecting during the movement. The distance between the roller 614 and the baffle 613 is adjusted by the width adjustment device arranged on the frame 1. When it is necessary to control the width adjustment device so that the rotating wheel fits the edge of the substrate 11, the vertical rod on the width adjustment device will be driven to move, and the distance between the roller 614 and the baffle 613 will be adjusted accordingly to adapt to composite boards 12 of different widths, so as to ensure that the changes in the widths of the substrate 11 and the composite board 12 can be synchronously adaptively adjusted.

[0046] A first sensor for detecting the position of the composite board 12 is fixedly provided on the support plate 602, and a second sensor (not shown in the figure) for detecting the position of the substrate 11 is fixedly provided on the frame 1. Both the first sensor and the second sensor are travel switches. A control device 10 is also fixedly provided on the frame 1. The signal output ends of the first sensor and the second sensor are connected to the signal input end of the control device 10, and the signal output end of the control device 10 is connected to the signal input end of the feeding device. When the first sensor detects that the composite plate 12 moves to the specified position on the support plate 602, the feeding device stops and waits for the substrate 11. When the second sensor detects that the substrate 11 moves to the specified position, the feeding device starts, so that the feeding device continues to push the composite plate 12 to move. When the starting end of the composite plate 12 moves to the end where the support plate 602 is close to the frame 1, the substrate 11 also moves to this position. The two move at the same time, the composite plate 12 falls on the substrate 11, and the feeding device continues to push the composite plate 12 to move. When the substrate 11 and the composite plate 12 move to the position of the rolling device 7, the push block 612 of the feeding device disengages from the composite plate 12, and the rolling device 7 and the conveying device 2 jointly drive the substrate 11 and the composite plate 12 to move forward, and the composite is completed by the rolling device 7.

[0047] The substrate 11 and the composite plate 12 are more tightly composited after the rolling device 7, and then the second glue coating device 8 applies glue to the grooves on both sides of the substrate 11 and the two sides of the composite plate 12, and then the bending device 9 (not in the prior art) Figure 1 (Detailed drawing in the figure) the parts on both sides of the groove of the base plate 11 are gradually folded upward along the groove so as to fit with both sides of the composite plate 12 to form a door frame line.

[0048] When using this embodiment, the substrate 11 is placed on the unloading table 31 of the unloading device 3, and multiple layers can be stacked. The composite board 12 is placed on the feeding rack 601 of the board composite device 6, and multiple layers can be stacked. Then the entire production line is started, and the cylinder 32 on the unloading device 3 drives the push plate 35 fixedly connected to the slider 34 to move. The push plate 35 abuts against the rear end of the bottom substrate 11, driving the substrate 11 to move toward the rack 1. When the substrate 11 moves to the conveying device 2 of the rack 1, it moves with the conveying device 2. At this time, the feeding device is started, driving the push block 612 on the chain 611 to move. The push block 612 abuts against the rear end of the bottom composite board 12, driving the composite board 12 to move toward the pallet 602 until it reaches the position of the first sensor, and the feeding device stops waiting for the substrate 11. The substrate 11 moves to the position of the second sensor after being grooved by the grooved device 4 and glued by the first glue coating device 5 along with the conveying device 2. At this time, the feeding device starts and continues to push the composite plate 12 to move along the support plate 602 until the composite plate 12 and the substrate 11 go hand in hand and fall on the substrate 11. At this time, the push block 612 on the chain 611 continues to push the composite plate 12 to move until it reaches the rolling device 7. The rolling device 7 drives the substrate 11 and the composite plate 12 to move at the same time and complete the compounding. The composite plate 12 is glued by the second glue coating device 8 and bent by the bending device 9 to finally form a door frame.

[0049] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A door frame composite bending production line, characterized by: It includes a frame, a conveying device mounted on the frame, and a material unloading device for carrying a substrate and pushing the substrate onto the conveying device, wherein a slotting device, a first gluing device, a rolling device, a second gluing device, and a bending device are fixed on the frame in sequence, and a plate compounding device is also fixed on the frame, and the plate compounding device is located above the slotting device and the first gluing device; The plate composite device comprises a support plate, a feeding rack for carrying the composite plate, and a feeding device for pushing the composite plate onto the support plate; wherein the support plate and the feeding rack are both fixedly arranged on the frame at an angle, the support plate and the feeding rack have the same angle of inclination and are connected end to end; the feeding device is fixedly arranged on the feeding rack, a first baffle plate is fixedly arranged at the end of the feeding rack, and a gap for the composite plate to pass through is arranged between the first baffle plate and the feeding rack; a first sensor for detecting the position of the composite plate is fixedly arranged on the support plate, and a second sensor for detecting the position of the substrate is fixedly arranged on the frame; A control device is also fixedly arranged on the frame, the signal output ends of the first sensor and the second sensor are connected to the signal input end of the control device, and the signal output end of the control device is connected to the signal input end of the feeding device.

2. The door frame composite bending production line according to claim 1 is characterized by: One end of the feeding frame close to the supporting plate is rotatably connected to the frame, and the other end is fixed on the frame.

3. The door frame composite bending production line according to claim 2 is characterized by: The feeding rack is fixedly provided with a plurality of first limiting devices for being close to both sides of the composite board. The first limiting devices are located on both sides of the composite board, and the width between the first limiting devices on both sides is adjusted by the first limiting parts.

4. The door frame composite bending production line according to any one of claims 1 to 3, characterized in that: A baffle is fixedly arranged on one side of the support plate, and a plurality of second limiting devices for closely contacting the edge of the composite plate are arranged on the other side of the support plate.

5. The door frame composite bending production line according to claim 4 is characterized in that: The feeding device includes two sprockets rotatably arranged on the feeding frame, a chain sleeved on the two sprockets and a driving device for driving the sprockets to rotate, and two push blocks abutting against the composite plate are fixedly arranged on the chain at intervals; an opening for the push blocks to pass through is provided in the length direction of the feeding frame.

6. The door frame composite bending production line according to claim 5 is characterized by: The unloading device includes a material unloading table, a cylinder fixed on the material unloading table, a slide rail fixed on the material unloading table and a slider slidably arranged on the slide rail. The telescopic end of the cylinder is fixedly connected to the slider, and a push plate that abuts against the substrate is fixed on the slider; a second material baffle plate is fixed at the end of the material unloading table, and a gap for the substrate to pass through is provided between the second material baffle plate and the table surface of the material unloading table.

7. The door frame composite bending production line according to claim 6 is characterized by: The unloading platform is fixedly provided with a limiting plate for limiting the positions of two sides of the substrate, wherein one side of the limiting plate is adjustably arranged on the unloading platform through a long hole.

8. The door frame composite bending production line according to claim 3 is characterized by: The first limiting device is a vertical plate, the first limiting portion is a first long through hole arranged on the feeding rack, and the vertical plate is detachably arranged on the first long through hole.

9. The door frame composite bending production line according to claim 4 is characterized by: The second limiting device is a roller rotatably arranged on the frame, and the rolling direction of the roller is the same as the moving direction of the composite plate.

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