CN110560591A

CN110560591A - Bending device

Info

Publication number: CN110560591A
Application number: CN201910945821.5A
Authority: CN
Inventors: 李杨; 刘国风; 鲁鹏; 田凯; 王鹏鹏
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Intelligent Equipment Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Intelligent Equipment Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2019-12-13
Anticipated expiration: 2039-09-30
Also published as: CN110560591B

Abstract

the invention provides a bending device. The bending device includes: the bending machine comprises a machine frame, a bending mechanism and a bending mechanism, wherein the machine frame comprises a bearing part for bearing a piece to be bent; the pushing assembly is arranged on the rack and comprises a pushing part, and the pushing part is movably arranged along a first preset direction to push a piece to be bent on the bearing part so as to enable the piece to be bent to move to a first preset position; the bending assembly is arranged on the rack and is used for bending the piece to be bent positioned at the first preset position; the material returning component is arranged on the rack and comprises a material returning part, and the material returning part is movably arranged along a second preset direction to push the bent piece to be bent so as to move the bent piece to be bent to a second preset position; the first preset direction is opposite to the second preset direction. The invention effectively solves the problems that the labor intensity of workers is increased for the bending processing of the heat exchanger in the prior art, and the processing efficiency is lower.

Description

bending device

Technical Field

The invention relates to the technical field of heat exchanger processing, in particular to a bending device.

Background

At present, in the process of machining the heat exchanger, the heat exchanger is generally required to be bent so as to be bent into a preset shape. In the process of bending the heat exchanger, the heat exchanger is usually operated in a manual feeding and blanking mode. Specifically, the heat exchanger is manually pushed to a preset position to be bent, and after the heat exchanger is bent, the bent heat exchanger is manually pushed to a discharging position.

However, the processing mode not only increases the labor intensity of workers, but also reduces the processing efficiency of the heat exchanger, prolongs the processing period and increases the production cost.

Disclosure of Invention

the invention mainly aims to provide a bending device, which aims to solve the problems that the labor intensity of workers is increased and the processing efficiency is low in the bending processing of a heat exchanger in the prior art.

In order to achieve the above object, the present invention provides a bending apparatus comprising: the bending machine comprises a machine frame, a bending mechanism and a bending mechanism, wherein the machine frame comprises a bearing part for bearing a piece to be bent; the pushing assembly is arranged on the rack and comprises a pushing part, and the pushing part is movably arranged along a first preset direction to push a piece to be bent on the bearing part so as to enable the piece to be bent to move to a first preset position; the bending assembly is arranged on the rack and is used for bending the piece to be bent positioned at the first preset position; the material returning component is arranged on the rack and comprises a material returning part, and the material returning part is movably arranged along a second preset direction to push the bent piece to be bent so as to move the bent piece to be bent to a second preset position; the first preset direction is opposite to the second preset direction.

Further, the material returned subassembly still includes: the material returning part is movably arranged on the first bracket; and the positioning part is arranged on the first support, and is used for limiting and stopping the piece to be bent in the process that the pushing part pushes the piece to be bent along the first preset direction, so that the piece to be bent is positioned at the first preset position.

Further, first support movably sets up in the frame, and the material returned subassembly still includes: the first driving structure is connected with the material returning part and drives the material returning part to move so that the material returning part pushes the piece to be bent; and the locking structure is arranged on the first support, and locks the first support and the rack before the material returning part pushes the bent piece to be bent.

Further, the bending device still includes: the second driving structure is connected with the first support to drive the first support to move towards or away from the material pushing assembly; the sliding rod is arranged on the rack, the first support penetrates through the sliding rod, and the locking structure locks the sliding rod and the first support so as to lock the first support on the rack.

furthermore, the number of the locking structures is at least two, the number of the sliding rods is at least two, and the locking structures are arranged corresponding to the sliding rods so as to lock the sliding rods and the first support.

Further, the locking structure includes: the two locking pieces are oppositely arranged, and a mounting hole for the sliding rod to pass through is formed between the two locking pieces; and the driving part is connected with one locking piece in the two locking pieces so as to drive the locking piece to move towards or away from the other locking piece, so that the aperture size of the mounting hole is adjusted.

Furthermore, the positioning part is arranged on the material returning part, the number of the positioning parts is at least one, and when the number of the positioning parts is multiple, the plurality of the positioning parts are arranged at intervals along the direction which is perpendicular to the second preset direction.

further, the pushing assembly further comprises: the pushing part is arranged on the second bracket; and the second driving structure is connected with the material pushing part to drive the material pushing part to move so that the material pushing part pushes the piece to be bent.

Furthermore, the pushing assembly also comprises a separation structure, and the separation structure is arranged on the second bracket; the separation structure comprises a first plate section and a second plate section which are connected with each other, and the first plate section and the second plate section are arranged at a first included angle; after the second plate section is inserted into the piece to be bent, the first plate section and the piece to be bent are limited and stopped.

Furthermore, the positioning part comprises a third plate section and a fourth plate section which are connected with each other, and the third plate section and the fourth plate section are arranged at a second included angle; when the piece to be bent moves to the first preset position, the third plate section and the piece to be bent limit and stop; the fourth plate section is located below the piece to be bent and supports the piece to be bent.

By applying the technical scheme of the invention, when the bending operation needs to be carried out on the piece to be bent, the material pushing assembly is started, so that the material pushing part pushes the piece to be bent on the bearing part along the first preset direction, the piece to be bent moves to the first preset position, and the feeding operation is further completed. And then, the bending assembly bends the piece to be bent at the first preset position. After the piece to be bent is bent, the material returning assembly is started, so that the material returning portion pushes the piece to be bent after the bending is completed along the second preset direction, the piece to be bent after the bending is completed moves to the second preset position, the material returning operation is completed, and the clamping device is convenient to clamp the piece to be bent after the bending is completed.

Compared with the mode of manual feeding and discharging in the prior art, the bending device in the application adopts the material pushing assembly and the material returning assembly to carry out feeding and discharging operation on a to-be-bent piece respectively, replaces a manual mode, and further solves the problems that the labor intensity of workers is increased for bending the heat exchanger in the prior art, and the machining efficiency is low.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

Fig. 1 shows a perspective view of an embodiment of a bending device according to the invention;

FIG. 2 shows a schematic perspective view of a material return assembly of the bending apparatus of FIG. 1;

FIG. 3 is a perspective view of the pusher assembly of the bending apparatus of FIG. 1;

FIG. 4 is a schematic perspective view of the pusher assembly of FIG. 3 at another angle; and

Fig. 5 shows a cross-sectional view of the first bracket and locking structure of the stripper assembly of fig. 2 after assembly.

Wherein the figures include the following reference numerals:

10. A frame; 11. a bearing part; 20. a material pushing assembly; 21. a material pushing section; 22. a second bracket; 23. a second drive structure; 24. a guide rail; 25. a partition structure; 251. a first plate section; 252. a second plate section; 30. a piece to be bent; 40. bending the assembly; 50. a material returning component; 51. a material returning part; 52. a first bracket; 53. a positioning part; 531. a third plate section; 532. a fourth plate segment; 54. a first drive structure; 55. a locking structure; 551. a locking member; 552. mounting holes; 553. a drive section; 60. a slide bar.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.

In order to solve the processing of bending to the heat exchanger among the prior art and increased staff intensity of labour to make the lower problem of machining efficiency, this application provides a bending device.

As shown in fig. 1 to 4, the bending apparatus includes a frame 10, a pushing assembly 20, a bending assembly 40, and an ejecting assembly 50. Wherein the machine frame 10 comprises a bearing part 11 for bearing the piece 30 to be bent. The pushing assembly 20 is arranged on the rack 10, the pushing assembly 20 includes a pushing portion 21, and the pushing portion 21 is movably arranged along a first preset direction to push a to-be-bent piece 30 located on the bearing portion 11, so that the to-be-bent piece 30 moves to a first preset position. The bending assembly 40 is disposed on the frame 10 to bend the to-be-bent member 30 located at the first predetermined position. The material returning assembly 50 is arranged on the machine frame 10, the material returning assembly 50 comprises a material returning portion 51, and the material returning portion 51 is movably arranged along a second preset direction to push the bent piece 30 to be bent, so that the bent piece 30 to be bent moves to a second preset position. The first preset direction is opposite to the second preset direction.

By applying the technical scheme of the embodiment, when the piece 30 to be bent needs to be bent, the pushing assembly 20 is started, so that the pushing portion 21 pushes the piece 30 to be bent on the bearing portion 11 along the first preset direction, so that the piece 30 to be bent moves to the first preset position, and then the feeding operation is completed. Then, the bending assembly 40 bends the to-be-bent piece 30 located at the first preset position. After the piece 30 to be bent is bent, the material returning assembly 50 is started, so that the material returning portion 51 pushes the piece 30 to be bent after the bending is completed along the second preset direction, the piece 30 to be bent after the bending is completed moves to the second preset position, the material returning operation is completed, and the clamping device is convenient to clamp the piece to be bent after the bending is completed.

compared with the mode of manual feeding and discharging in the prior art, the bending device in the embodiment respectively adopts the material pushing assembly 20 and the material returning assembly 50 to perform feeding and discharging operations on the to-be-bent piece 30, so that a manual mode is replaced, and the problems that the labor intensity of workers is increased for bending the heat exchanger in the prior art and the machining efficiency is low are solved.

in this embodiment, the member to be bent 30 is a heat exchanger.

As shown in fig. 2, the material returning assembly 50 further includes a first bracket 52 and a positioning portion 53. Wherein, the material returning part 51 is movably arranged on the first bracket 52. The positioning portion 53 is disposed on the first bracket 52, and in a process that the pushing portion 21 pushes the to-be-bent piece 30 along the first preset direction, the positioning portion 53 limits and stops the to-be-bent piece 30, so that the to-be-bent piece 30 is located at the first preset position. Therefore, in the process that the pushing portion 21 pushes the to-be-bent piece 30 to move along the first preset direction, the to-be-bent piece 30 is limited and stopped by the positioning portion 53, so that the to-be-bent piece 30 stays at the first preset position, the bending component 40 is convenient to bend the to-be-bent piece 30, and the use reliability and the bending accuracy of the bending device are improved.

As shown in fig. 2 and 5, the first support 52 is movably disposed on the frame 10, and the material returning assembly 50 further includes a first driving structure 54 and a locking structure 55. The first driving structure 54 is connected to the material returning portion 51, and the first driving structure 54 drives the material returning portion 51 to move so that the material returning portion 51 pushes the to-be-bent piece 30. The locking structure 55 is arranged on the first bracket 52, and before the material returning part 51 pushes the bent member 30 to be bent, the locking structure 55 locks the first bracket 52 and the frame 10. In this way, the locking position of the material returning assembly 50 and the rack 10 can be adjusted according to the specification and the size of the piece 30 to be bent, so that the bending device can perform bending operation on the pieces 30 to be bent with different specifications and sizes, and the application range of the bending device is widened.

Specifically, before the material returning assembly 50 performs the material returning operation on the to-be-bent piece 30 after the bending is completed, the material returning assembly 50 is operated to adjust the relative position between the first bracket 52 and the machine frame 10. After the position between the first support 52 and the frame 10 is adjusted, the worker operates the locking structure 55 to lock the first support 52 and the frame 10 through the locking structure 55, so that the phenomenon that the normal use of the material returning assembly 50 is affected due to relative sliding between the first support and the frame is avoided, and the use reliability of the bending device is improved.

Alternatively, the first drive structure 54 is a pneumatic or hydraulic cylinder. In this way, the piston rod of the cylinder or the hydraulic cylinder is connected with the material returning part 51, and the piston rod performs telescopic motion to drive the material returning part 51 to push the bent piece 30 to be bent to move along the second preset direction.

as shown in fig. 1, the bending device further comprises a second drive mechanism and a slide bar 60. Wherein the second driving structure is connected to the first bracket 52 to drive the first bracket 52 toward or away from the pusher assembly 20. The sliding rod 60 is disposed on the frame 10, the first bracket 52 is disposed on the sliding rod 60, and the locking structure 55 locks the sliding rod 60 and the first bracket 52 to lock the first bracket 52 on the frame 10. In this way, during the second driving structure drives the first bracket 52 to move, the sliding rod 60 guides the first bracket 52, so that the first bracket 52 moves along the extending direction of the sliding rod 60, and the moving smoothness of the first bracket 52 is further improved.

specifically, when the position of the first bracket 52 needs to be adjusted, the second driving mechanism is activated, so that the second driving mechanism drives the first bracket 52 to move along the sliding rod 60, and after the first bracket 52 moves to a proper position, the second driving mechanism stops operating. Thereafter, the locking mechanism 55 locks the first bracket 52 and the slide bar 60, and prevents the first bracket 52 from sliding along the slide bar 60 to affect the material discharging operation of the subsequent material discharging assembly 50.

In the embodiment, the number of the sliding rods 60 is four, and the four sliding rods 60 are arranged in parallel and consistent with the second preset direction. Thus, the above arrangement promotes the smoothness of the movement of the first support 52, and ensures that the first support 52 can move stably relative to the frame 10.

The number of the slide bars 60 is not limited to this. Optionally, the sliding rod 60 is one, or two, or three, or more.

Alternatively, there are at least two locking structures 55, at least two sliding rods 60, and the locking structures 55 are disposed corresponding to the sliding rods 60 to lock the sliding rods 60 and the first bracket 52. As shown in fig. 2, there are two locking structures 55 and four sliding rods 60, and the two locking structures 55 are disposed corresponding to two of the sliding rods 60 to lock the sliding rods 60 and the first bracket 52. Thus, the arrangement ensures that the locking structure 55 can effectively and reliably lock the first bracket 52 and the slide rod 60, and avoids the situation that the first bracket 52 and the slide rod 60 slide relatively to each other to affect the normal material returning of the material returning assembly 50.

It should be noted that the number of the locking structures 55 is not limited to this. Optionally, the locking structure 55 is one, or three, or four, or more.

As shown in fig. 2 and 5, the locking structure 55 includes two locking members 551 and an actuating portion 553 disposed opposite to each other. Wherein, a mounting hole 552 for the sliding rod 60 to pass through is arranged between the two locking members 551. The driving portion 553 is connected to one of the two locking members 551 to drive the locking member 551 toward or away from the other locking member 551 to adjust the size of the aperture of the mounting hole 552. Thus, when it is required to lock the first frame 52 and the slide bar 60, the driving portion 553 is activated such that the driving portion 553 drives one of the locking members 551 toward the other locking member 551 to reduce the size of the mounting hole 552, to achieve the locking of the two locking members 551 with the slide bar 60, and thus to lock the first frame 52 with the slide bar 60. Meanwhile, the structure is simple, easy to process and realize, and the processing cost of the locking structure 55 is reduced.

specifically, two locking members 551 are provided at intervals in the height direction of the locking structure 55, the driving portion 553 is connected to the locking member 551 located below, the driving portion 553 is activated, and the driving portion 553 drives the locking member 551 located below to move toward the other locking member 551 to reduce the size of the mounting hole 552. When the locking member 551 moves to the locking structure 55 to lock the slide bar 60 and the first bracket 52, the driving portion 553 is operated to stop the driving portion 553. When the position relationship between the first bracket 52 and the frame 10 needs to be adjusted, the driving portion 553 is activated, so that the driving portion 553 drives the locking member 551 located below to move away from the other locking member 551, so as to increase the size of the mounting hole 552, and unlock the slide bar 60 and the locking structure 55.

Alternatively, the driving part 553 is an air cylinder or a hydraulic cylinder. Like this, the piston rod of cylinder or pneumatic cylinder is connected with retaining member 551 who is located the below, and the piston rod carries out concertina movement to drive retaining member 551 and remove along the direction of height.

Alternatively, the positioning portion 53 is disposed on the material returning portion 51, at least one positioning portion 53 is provided, and when the positioning portion 53 is plural, the plural positioning portions 53 are disposed at intervals along a direction perpendicular to the second preset direction. As shown in fig. 2, there are two positioning portions 53, and the two positioning portions 53 are disposed at intervals along a direction perpendicular to the second predetermined direction, so as to position the to-be-bent piece 30. Like this, the setting further promotes the location precision of location portion 53, guarantees to wait to bend the piece 30 and can stop advancing when moving to first preset position department, and the subassembly 40 of being convenient for bends it and operate.

The number of the positioning portions 53 is not limited to this. Optionally, the positioning portion 53 is one, or three, or four, or five.

As shown in fig. 1, 3 and 4, the pushing assembly 20 further includes a second bracket 22 and a second driving structure 23. Wherein, the pushing part 21 is arranged on the second bracket 22. The second driving structure 23 is connected to the pushing portion 21 to drive the pushing portion 21 to move so that the pushing portion 21 pushes the to-be-bent piece 30. Therefore, when the pushing assembly 20 is required to push the piece 30 to be bent, the second driving structure 23 is started, and the second driving structure 23 drives the pushing portion 21 to push the piece 30 to be bent to slide along the first preset direction, so that the operation of the pushing portion 21 by a worker is easier and simpler, and the operation difficulty is reduced.

as shown in fig. 3 and 4, the bending device further includes a guide rail 24. Specifically, the second support 22 is movably connected to the frame 10, when the second driving structure 23 drives the pushing unit 21 to move, the second support 22 may also be driven to move toward or away from the frame 10, and the second support 22 is slidably disposed along the guide rail 24, so that the movement of the second support 22 relative to the frame 10 is more stable. Wherein the extending direction of the guide rail 24 and the first predetermined direction are arranged parallel to each other.

as shown in fig. 3 and 4, the pushing assembly 20 further includes a partition structure 25, and the partition structure 25 is disposed on the second bracket 22; the partition structure 25 comprises a first plate section 251 and a second plate section 252 connected to each other, the first plate section 251 and the second plate section 252 being arranged at a first angle. After the second plate section 252 is inserted into the to-be-bent member 30, the first plate section 251 and the to-be-bent member 30 are limited and stopped. Specifically, the to-be-bent piece 30 is a double-layer heat exchanger, and the second plate section 252 is inserted into the double-layer heat exchanger to push the double-layer heat exchanger to move along a first preset direction, so that the operation of the pushing assembly 20 on the double-layer heat exchanger is easier.

Optionally, the first included angle is 90 °. Thus, after the second plate section 252 is inserted into the double-layer heat exchanger, the first plate section 251 contacts with the double-layer heat exchanger to push the double-layer heat exchanger to move along the first preset direction until the second plate section moves to the first preset position.

it should be noted that the size of the first included angle is not limited to this, as long as the first plate segment 251 can be in contact with the double-layer heat exchanger.

As shown in fig. 2, the positioning portion 53 includes a third plate 531 and a fourth plate 532 connected to each other, and the third plate 531 and the fourth plate 532 are disposed at a second included angle. When the to-be-bent piece 30 moves to the first preset position, the third plate 531 and the to-be-bent piece 30 are stopped in a limiting manner. The fourth plate segment 532 is located below the to-be-bent member 30 and supports the to-be-bent member 30. Thus, the structure is simple, easy to process and implement, and the positioning part 53 can position the to-be-bent piece 30. At the same time, the user can select the desired position,

optionally, the second included angle is 90 °. It should be noted that the size of the second included angle is not limited to this, as long as the third plate segment 531 can limit and stop the to-be-bent element 30.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

When the bending operation is needed to be performed on the piece to be bent, the material pushing assembly is started, so that the material pushing portion pushes the piece to be bent on the bearing portion along the first preset direction, the piece to be bent moves to the first preset position, and the feeding operation is completed. And then, the bending assembly bends the piece to be bent at the first preset position. After the piece to be bent is bent, the material returning assembly is started, so that the material returning portion pushes the piece to be bent after the bending is completed along the second preset direction, the piece to be bent after the bending is completed moves to the second preset position, the material returning operation is completed, and the clamping device is convenient to clamp the piece to be bent after the bending is completed.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bending device, comprising:

The bending machine comprises a machine frame (10), wherein the machine frame (10) comprises a bearing part (11) for bearing a piece (30) to be bent;

The pushing assembly (20) is arranged on the rack (10), the pushing assembly (20) comprises a pushing portion (21), and the pushing portion (21) is movably arranged along a first preset direction to push the piece (30) to be bent on the bearing portion (11) so that the piece (30) to be bent moves to a first preset position;

The bending assembly (40) is arranged on the rack (10) and is used for bending the piece (30) to be bent at the first preset position;

The material returning assembly (50) is arranged on the rack (10), the material returning assembly (50) comprises a material returning part (51), and the material returning part (51) is movably arranged along a second preset direction to push the bent piece (30) to be bent, so that the bent piece (30) to be bent moves to a second preset position; the first preset direction is opposite to the second preset direction.

2. the bending device according to claim 1, wherein the stripper assembly (50) further comprises:

A first bracket (52), wherein the material returning part (51) is movably arranged on the first bracket (52);

The positioning part (53) is arranged on the first support (52), and in the process that the pushing part (21) pushes the piece (30) to be bent along a first preset direction, the positioning part (53) limits and stops the piece (30) to be bent so that the piece (30) to be bent is located at a first preset position.

3. The bending apparatus according to claim 2, wherein the first support (52) is movably disposed on the frame (10), the material return assembly (50) further comprising:

The first driving structure (54), the first driving structure (54) is connected with the material returning part (51), and the first driving structure (54) drives the material returning part (51) to move so that the material returning part (51) pushes the piece (30) to be bent;

the locking structure (55) is arranged on the first support (52), and before the material returning part (51) pushes the bent piece (30) to be bent, the locking structure (55) locks the first support (52) and the rack (10).

4. The bending device according to claim 3, further comprising:

A second drive arrangement connected to the first carriage (52) to drive the first carriage (52) towards or away from the pusher assembly (20);

The sliding rod (60) is arranged on the rack (10), the first support (52) penetrates through the sliding rod (60), and the locking structure (55) locks the sliding rod (60) and the first support (52) so as to lock the first support (52) on the rack (10).

5. the bending device according to claim 4, wherein the number of the locking structures (55) is at least two, the number of the sliding bars (60) is at least two, and the locking structures (55) are arranged in correspondence with the sliding bars (60) to lock the sliding bars (60) and the first bracket (52).

6. The bending device according to claim 4, wherein the locking structure (55) comprises:

Two oppositely arranged locking pieces (551), wherein a mounting hole (552) for the sliding rod (60) to pass through is formed between the two locking pieces (551);

A driving portion (553), the driving portion (553) being connected with one of the two locking members (551) to drive the locking member (551) to move toward or away from the other locking member (551) to adjust the aperture size of the mounting hole (552).

7. The bending apparatus according to claim 2, wherein the positioning portion (53) is provided on the material returning portion (51), the number of the positioning portions (53) is at least one, and when the number of the positioning portions (53) is plural, the plural positioning portions (53) are provided at intervals in a direction perpendicular to the second preset direction.

8. The bending device according to claim 1, wherein the pusher assembly (20) further comprises:

The second bracket (22), the said pusher (21) is set up on the said second bracket (22);

The second driving structure (23), the second driving structure (23) is connected with the material pushing portion (21) to drive the material pushing portion (21) to move so that the material pushing portion (21) pushes the piece (30) to be bent.

9. the bending device according to claim 8, wherein the pusher assembly (20) further comprises a partition structure (25), the partition structure (25) being arranged on the second bracket (22); the separation structure (25) comprises a first plate section (251) and a second plate section (252) which are connected with each other, and the first plate section (251) and the second plate section (252) are arranged at a first included angle; after the second plate section (252) is inserted into the piece (30) to be bent, the first plate section (251) and the piece (30) to be bent are limited and stopped.

10. the bending device according to claim 2, wherein the positioning portion (53) comprises a third plate section (531) and a fourth plate section (532) which are connected with each other, and the third plate section (531) and the fourth plate section (532) are arranged at a second included angle; when the piece (30) to be bent moves to the first preset position, the third plate section (531) and the piece (30) to be bent are limited and stopped; the fourth plate section (532) is located below the piece (30) to be bent and supports the piece (30) to be bent.