CN114289564A

CN114289564A - Cambered surface bender of adjustable angle of bending

Info

Publication number: CN114289564A
Application number: CN202111504604.6A
Authority: CN
Inventors: 赵影丽
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-04-08

Abstract

The invention discloses a cambered surface bending machine with an adjustable bending angle, which comprises a base, wherein a supporting mechanism for supporting a workpiece is arranged on the upper side of the base; the arc-shaped bending of the thin plate is realized by the opposite movement of the arc-shaped central cylinder and the two lower bending plates, the surface of the thin plate is prevented from generating creases, the appearance of a finished product is ensured, the upper bending plates on the left side and the right side and the lower bending plates on the left side and the right side can be driven to simultaneously turn inside and outside by rotating the screw shaft, so that the bending angle of the thin plate is adjusted, and the applicability of the invention is improved.

Description

Cambered surface bender of adjustable angle of bending

Technical Field

The invention relates to the relevant technical field of bending machines, in particular to a cambered surface bending machine with an adjustable bending angle.

Background

The bender is a machine that can bend the sheet metal, traditional bender realizes buckling to the sheet metal through the mutual butt of last lower mould, generally can only the face of bending, and when need be rolled over into the cambered surface with the sheet metal, can only just can be bent into the cambered surface with it through the repeated bending of short distance, but this kind of bending method leads to the cambered surface of processing into not smooth, the crease is obvious, influence finished product outward appearance, and current cambered surface bender, its angle of bending is decided by the mould, if need process the finished product of different angle degrees of bending, need frequently change the mould, and it is comparatively loaded down with trivial details again to lead the mould change process, thereby lead to machining efficiency low.

Disclosure of Invention

The invention aims to provide a cambered surface bending machine with an adjustable bending angle, which is used for overcoming the defects in the prior art.

The cambered surface bending machine with the adjustable bending angle comprises a base, wherein a supporting mechanism for supporting a workpiece is arranged on the upper side of the base, a lifting plate is arranged on the upper side of the base, and an angle adjusting mechanism for adjusting the bending angle is arranged on the upper side of the lifting plate;

the supporting mechanism comprises two lower bending plates hinged to the upper end face of the base, the two lower bending plates are arranged in a bilateral symmetry mode, the end faces of the outer sides of the two lower bending plates are hinged to lower chain connecting rods, and the lower ends of the two lower chain connecting rods are hinged to thread blocks;

angle adjustment mechanism is including adjusting the seat, be provided with the piece of screw thread in the regulation seat, it all articulates at both ends has last connecting rod, two to go up the piece of screw thread about both ends go up the connecting rod lower extreme and all articulate and have the board of bending on, it is fixed with a center section of thick bamboo to adjust the seat downside, the equal sliding fit in center section of thick bamboo left and right sides has the board of bending on, two go up the board medial surface of bending respectively with correspond the side go up the connecting rod lower extreme and articulate.

Preferably, two threaded block cavities with upward openings are arranged in the base, the two threaded block cavities are respectively in sliding fit with the threaded blocks on the corresponding sides, the two lower bending plates are positioned between the thread block cavities on the left side and the right side, a transmission cavity is arranged between the two thread block cavities, a bevel gear cavity is arranged at the rear side of the transmission cavity, bevel gear cavities are arranged at the outer sides of the two thread block cavities, a synchronizing shaft is arranged in the transmission cavity, the left side part and the right side part of the synchronizing shaft extend outwards to penetrate through the thread block cavities on the corresponding sides to the bevel gear cavities on the corresponding sides, the two thread blocks are in threaded fit with the synchronizing shaft, a driving bevel gear positioned in the transmission cavity is fixed on the synchronizing shaft, through the rotation of the synchronizing shaft, the two thread blocks are far away from or close to each other, so that the included angle between the two lower bending plates is adjusted.

Preferably, an upper threaded block cavity which is through from left to right is arranged in the adjusting seat, the upper threaded block is in sliding fit with the upper threaded block cavity, a screw shaft is in rotating fit with the lower end wall of the upper threaded block cavity, the upper side part of the screw shaft extends upwards to penetrate through the upper threaded block cavity to the upper end wall of the upper threaded block cavity, the upper threaded block is in threaded fit with the screw shaft, a central shaft is fixed in the central cylinder, the front part and the rear part of the central shaft both extend outwards to the outside of the central cylinder, the central shaft is in rotating fit with two rotating blocks which are symmetrical front and back, the two rotating blocks are respectively positioned on the front side and the rear side of the central cylinder, the rotating block on the front side is fixedly arranged with the upper bending plate on the right side, the rotating block on the rear side is fixedly arranged with the upper bending plate on the left side, the outer end faces of the two upper bending plates are respectively tangent to the periphery of the central cylinder, and the upper threaded block moves up and down, and adjusting the included angle between the two upper bending plates.

Preferably, a through cavity which is through from top to bottom is formed in the lifting plate, the two lower bending plates penetrate through the through cavity, supporting plate cavities are formed in the left side and the right side of the through cavity and communicated with supporting plates, supporting plates are arranged in the supporting plate cavities in a sliding fit mode, supporting plate springs are fixed between the supporting plates and the bottom walls of the supporting plate cavities on the corresponding sides, the supporting plates are respectively abutted to the lower bending plates on the corresponding sides, and the lifting plate and the supporting plates on the left side and the right side are used for placing supporting thin plates.

Preferably, the tail ends of the left side and the right side of the synchronizing shaft are respectively fixed with a driving bevel gear, the upper end walls of the two bevel gear cavities are respectively and rotatably matched with a screw rod, the upper side parts of the two screw rods extend upwards to the outside of the base, the lower side parts of the two screw rods extend downwards to the bevel gear cavities on the corresponding sides, the tail ends of the lower sides of the two screw rods are respectively and fixedly provided with a driven bevel gear meshed with the driving bevel gear on the corresponding side, the two screw rods are respectively and rotatably matched with the lifting plate, and the lifting plate can move up and down by means of rotation of the screw rods.

Preferably, two supporting seats are fixed on the upper end face of the base, the two supporting seats are symmetrically arranged front and back by taking the lower bending plate as a center, lifting block cavities with inward openings are formed in the two supporting seats, lifting blocks are arranged in the two lifting block cavities in a sliding fit mode, the two lifting blocks are fixed on the front end face and the rear end face of the adjusting seat respectively, a motor fixedly arranged on the supporting seat on the front side is arranged on the lower side of the lifting block cavity on the front side, a motor shaft is connected to the upper end of the motor shaft in a power mode, the upper portion of the motor shaft extends upwards to penetrate through the lifting block cavities on the front side to the upper end wall of the lifting block cavity on the front side, the motor shaft is in threaded fit with the lifting blocks on the front side, the motor shaft is driven to rotate by the motor, and therefore the central cylinder moves up and down, and bending operation is achieved.

Preferably, a belt cavity is arranged on the upper side of the upper thread block cavity, the rear side portion of the belt cavity extends backwards into the lifting block on the rear side, the upper side portion of the screw shaft extends upwards to penetrate through the belt cavity to the outside of the adjusting seat, an annular seat is rotationally matched with the lower end wall of the belt cavity in a rotating mode, the upper side portion of the annular seat extends upwards into the belt cavity, two belt pulleys which are symmetrical in the front-back mode are arranged in the belt cavity, a belt is dynamically matched between the two belt pulleys, the belt pulley on the front side is fixed at the tail end of the upper side of the screw shaft, and the belt pulley on the rear side is fixed on the upper end face of the annular seat.

Preferably, the pulley internal spline is matched with a transmission shaft, the upper side part of the transmission shaft extends upwards to the upper end wall of the lifting block cavity at the rear side, the lower side part of the transmission shaft extends downwards to the helical gear cavity, the transmission shaft penetrates through the lifting block at the rear side and the lifting block cavity at the rear side, a driven helical gear is fixed at the tail end of the lower side of the transmission shaft, a helical gear shaft is rotationally matched in the rear end wall of the transmission cavity, the front side part of the helical gear shaft extends forwards to the transmission cavity, the rear side part extends backwards to the helical gear cavity, synchronous helical gears are fixed at the tail ends of the front side and the rear side of the helical gear shaft, the synchronous helical gear at the rear side is meshed with the driven helical gear, and the synchronous helical gear at the front side is meshed with the driving helical gear.

The invention has the beneficial effects that: the arc-shaped bending of the thin plate is realized by the opposite movement of the arc-shaped central cylinder and the two lower bending plates, the surface of the thin plate is prevented from generating creases, the appearance of a finished product is ensured, the upper bending plates on the left side and the right side and the lower bending plates on the left side and the right side can be driven to simultaneously turn inside and outside by rotating the screw shaft, so that the bending angle of the thin plate is adjusted, and the applicability of the invention is improved.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the overall structure of the bending-angle-adjustable bending machine for cambered surfaces according to the present invention;

FIG. 3 is a schematic view of A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is an enlarged, fragmentary view of the adjustment block assembly of FIG. 2 in accordance with the present invention;

FIG. 5 is an enlarged, fragmentary view of the lower bend plate member of FIG. 2 in accordance with the present invention;

fig. 6 is a partially enlarged schematic view of the rear lifter block assembly of fig. 3 according to the present invention.

In the figure:

10. a base; 11. a drive bevel gear; 12. a bevel gear cavity; 13. a driven bevel gear; 14. a screw rod; 15. a lifting plate; 16. a support plate cavity; 17. a support plate spring; 18. a support plate; 19. a central shaft; 20. an adjusting seat; 21. a supporting seat; 22. upwards bending the plate; 23. a central barrel; 24. a cavity is communicated; 25. a lower chain link rod; 26. a thread block; 27. a lower bending plate; 28. a synchronizing shaft; 29. a threaded block cavity; 30. a belt; 31. a lifting block; 32. a motor shaft; 33. rotating the block; 34. a motor; 35. a bevel gear shaft; 36. a synchronous helical gear; 37. a helical gear cavity; 38. a driven helical gear; 39. a lifting block cavity; 40. a drive shaft; 41. a belt chamber; 42. a screw shaft; 43. an upper connecting rod; 44. an upper thread block cavity; 45. an upper thread block; 46. a driving bevel gear; 47. a transmission cavity; 48. a pulley; 49. an annular seat.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent, the following detailed description of the invention, taken in conjunction with the examples, should be understood that the following text is only intended to describe one or several specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, and as used herein, the terms up, down, left and right are not limited to their strict geometric definitions, but include tolerances for reasonable and inconsistent machining or human error, the following detailed description of the specific features of the adjustable bending angle bending machine:

referring to fig. 1-6, the bending machine for cambered surfaces with adjustable bending angles according to the embodiment of the present invention includes a base 10, a supporting mechanism for supporting a workpiece is disposed on an upper side of the base 10, a lifting plate 15 is disposed on an upper side of the base 10, and an angle adjusting mechanism for adjusting the bending angles is disposed on an upper side of the lifting plate 15;

the supporting mechanism comprises two lower bending plates 27 hinged to the upper end face of the base 10, the two lower bending plates 27 are arranged in bilateral symmetry, the end faces of the outer sides of the two lower bending plates 27 are hinged to lower chain connecting rods 25, and the lower ends of the two lower chain connecting rods 25 are hinged to threaded blocks 26;

angle adjustment mechanism is including adjusting seat 20, it is provided with screw thread piece 45 in the seat 20 to adjust, it all articulates at both ends has last connecting rod 43, two to go up screw thread piece 45 about both ends go up connecting rod 43 lower extreme and all articulate there is the board 22 of bending on, it is fixed with a central section of thick bamboo 23 to adjust 20 downside of seat, the equal sliding fit in the left and right sides of a central section of thick bamboo 23 has the board 22 of bending on, two go up the board 22 medial surface of bending respectively with correspond the side go up connecting rod 43 lower extreme is articulated.

Wherein, two thread block cavities 29 with upward openings are arranged in the base 10, the two thread block cavities 29 are respectively in sliding fit with the thread blocks 26 on the corresponding sides, the two lower bending plates 27 are respectively positioned between the thread block cavities 29 on the left and right sides, a transmission cavity 47 is arranged between the two thread block cavities 29, a bevel gear cavity 37 is arranged on the rear side of the transmission cavity 47, bevel gear cavities 12 are arranged on the outer sides of the two thread block cavities 29, a synchronizing shaft 28 is arranged in the transmission cavity 47, the left and right sides of the synchronizing shaft 28 extend outwards to penetrate through the thread block cavities 29 on the corresponding sides to the bevel gear cavities 12 on the corresponding sides, the two thread blocks 26 are in threaded fit with the synchronizing shaft 28, the thread directions of the thread blocks 26 on the left and right sides are opposite, and the directions of the two threads in the thread block cavities 29 on the left and right sides of the synchronizing shaft 28 are opposite, a driving bevel gear 46 positioned in the transmission cavity 47 is fixed on the synchronizing shaft 28, and the two thread blocks 26 are moved away from or close to each other by the rotation of the synchronizing shaft 28, so as to adjust the included angle between the two lower bending plates 27.

Wherein, an upper thread block cavity 44 which is through from left to right is arranged in the adjusting seat 20, the upper thread block 45 is in sliding fit with the upper thread block cavity 44, a screw shaft 42 is in rotating fit with the lower end wall of the upper thread block cavity 44, the upper side part of the screw shaft 42 extends upwards to penetrate through the upper thread block cavity 44 to the upper end wall of the upper thread block cavity 44, the upper thread block 45 is in threaded fit with the screw shaft 42, a central shaft 19 is fixed in the central cylinder 23, the front part and the rear part of the central shaft 19 both extend outwards to the outside of the central cylinder 23, two symmetrical rotating blocks 33 are in rotating fit with the central shaft 19, the two rotating blocks 33 are respectively positioned at the front side and the rear side of the central cylinder 23, the rotating block 33 at the front side is fixedly arranged with the upper bending plate 22 at the right side, the rotating block 33 at the rear side is fixedly arranged with the upper bending plate 22 at the left side, the outer end faces of the two upper bending plates 22 are both tangent to the periphery of the central cylinder 23, the two upper bending plates 22 can slide along the periphery of the central cylinder 23, so that the continuity between the end face of the outer side of the upper bending plate 22 and the periphery of the central cylinder 23 is ensured, the bending quality is sequentially improved, and the included angle between the two upper bending plates 22 is adjusted through the up-and-down movement of the upper thread block 45.

The lifting plate 15 is internally provided with a through cavity 24 which is through up and down, the lower bending plate 27 penetrates through the through cavity 24, the left side and the right side of the through cavity 24 are respectively communicated with a supporting plate cavity 16, the supporting plate cavity 16 is internally provided with a supporting plate 18 in a sliding fit manner, the supporting plate 18 corresponds to the supporting plate cavity 16, a supporting plate spring 17 is fixed between the bottom wall of the supporting plate cavity 16, the supporting plate 18 corresponds to the corresponding side, the lower bending plate 27 is abutted and the upper end of the lower bending plate 27 is an arc, so that the thin plate can smoothly slide when bent, the lifting plate 15 and the left side and the right side of the supporting plate 18 are used for placing a supporting thin plate, and the position of the plate when bent is convenient to adjust.

The tail ends of the left side and the right side of the synchronizing shaft 28 are respectively fixed with a driving bevel gear 11, the upper end walls of the two bevel gear cavities 12 are respectively and rotatably matched with a screw rod 14, the upper side parts of the two screw rods 14 extend upwards to the outside of the base 10, the lower side parts of the two screw rods extend downwards to the bevel gear cavities 12 on the corresponding sides, the tail ends of the lower sides of the two screw rods 14 are respectively and fixedly provided with a driven bevel gear 13 meshed with the driving bevel gear 11 on the corresponding side, the two screw rods 14 are respectively and threadedly matched with the lifting plate 15, and the screw rods 14 on the left side and the right side can simultaneously rotate through the rotation of the synchronizing shaft 28, so that the lifting plate 15 moves up and down.

Wherein, two supporting seats 21 are fixed on the upper end face of the base 10, the two supporting seats 21 are symmetrically arranged around the lower bending plate 27 as the center, two lifting block cavities 39 with inward openings are arranged in the two supporting seats 21, two lifting blocks 31 are arranged in the two lifting block cavities 39 in a sliding fit manner, the two lifting blocks 31 are respectively fixed on the front end face and the rear end face of the adjusting seat 20, a motor 34 fixedly arranged on the front side of the lifting block cavity 39 is arranged on the lower side of the front side of the lifting block cavity 39, the upper end of the motor 34 is connected with a motor shaft 32 in a power manner, the upper part of the motor shaft 32 extends upwards to penetrate through the front side of the lifting block cavity 39 to the upper end wall of the front side of the lifting block cavity 39, the motor shaft 32 is in threaded fit with the front side of the lifting block 31, the motor shaft 32 is driven to rotate by the motor 34, so as to enable the central cylinder 23 to move up and down, thereby, the bending operation is realized.

A belt cavity 41 is arranged on the upper side of the upper thread block cavity 44, the rear portion of the belt cavity 41 extends backwards into the lifting block 31 on the rear side, the upper portion of the screw shaft 42 extends upwards to penetrate through the belt cavity 41 to the outside of the adjusting seat 20, an annular seat 49 is rotationally matched on the lower end wall of the belt cavity 41, the upper portion of the annular seat 49 extends upwards into the belt cavity 41, the annular seat 49 is used for supporting the belt wheel 48, two belt wheels 48 which are symmetrical front and back are arranged in the belt cavity 41, a belt 30 is dynamically matched between the two belt wheels 48, the belt wheel 48 on the front side is fixed at the tail end of the upper side of the screw shaft 42, and the belt wheel 48 on the rear side is fixed on the upper end surface of the annular seat 49.

Wherein, the pulley 48 is internally spline-fitted with a transmission shaft 40, so that in the process of downward movement of the lifting block 31, the transmission shaft 40 can drive the pulley 48 to rotate, the upper portion of the transmission shaft 40 extends upward into the upper end wall of the lifting block cavity 39 at the rear side, the lower portion extends downward into the bevel gear cavity 37, the transmission shaft 40 penetrates through the lifting block 31 at the rear side and the lifting block cavity 39 at the rear side, the lower end of the transmission shaft 40 is fixed with a driven bevel gear 38, the rear end wall of the transmission cavity 47 is rotationally fitted with a bevel gear shaft 35, the front portion of the bevel gear shaft 35 extends forward into the transmission cavity 47, the rear portion extends backward into the bevel gear cavity 37, the front and rear ends of the bevel gear shaft 35 are both fixed with a synchronous bevel gear 36, and the synchronous bevel gear 36 at the rear side is engaged with the driven bevel gear 38, the front side of the timing bevel gear 36 meshes with the driving bevel gear 46.

The invention relates to a cambered surface bending machine with an adjustable bending angle, which comprises the following working procedures:

the thin plate is placed at the upper ends of the two lower bending plates 27, the motor 34 is started, the motor shaft 32 is rotated, the lifting block 31 on the right side is driven to move downwards, the adjusting seat 20 is driven to move downwards, the central cylinder 23 is driven to move downwards, and accordingly the arc surface bending of the thin plate is achieved.

Bending is complete when the two upper 22 and two lower 27 bend plates clamp the sheet completely.

If the bending angle needs to be changed, the screw shaft 42 is rotated to move the upper screw block 45 downward, and the upper bending plates 22 on the left and right sides are rotated downward around the central shaft 19 through the upper connecting rod 43, so that the included angles of the upper bending plates 22 on the left and right sides are increased.

In this process, the screw shaft 42 rotates to rotate the belt wheel 48 at the front side, and the belt wheel 48 at the rear side rotates through the belt 30, so as to drive the transmission shaft 40 to rotate, so as to drive the driven bevel gear 38 to rotate, so as to drive the synchronous bevel gear 36 at the rear side to rotate, so as to drive the bevel gear shaft 35 at the front side to rotate, so as to drive the driving bevel gear 46 to rotate, so as to drive the synchronous shaft 28 to rotate.

The synchronizing shaft 28 rotates and makes the screw block 26 of the left and right sides keep away from the motion each other, through lower chain link 25 for the lower board 27 of bending of the left and right sides uses the pin joint to rotate downwards as the center, makes the contained angle between the lower board 27 of bending of the left and right sides increase, thereby makes the lower board 27 of bending of the left and right sides and the last board 22 of bending of corresponding side parallel all the time, with this angle that realizes adjusting the sheet metal and bend.

In the process that the angle of the left and right lower bending plates 27 is increased, the synchronizing shaft 28 rotates to drive the two driving bevel gears 11 to rotate, so that the two driven bevel gears 13 rotate, the screw rods 14 driving the left and right sides rotate simultaneously, the lifting plate 15 moves downwards, the supporting plates 18 on the left and right sides are always positioned below the upper ends of the lower bending plates 27 on the corresponding sides, the supporting plates 18 are gradually pressed into the supporting plate cavities 16 to compress the supporting plate springs 17 due to the angle increase of the lower bending plates 27, the two supporting plates 18 are always abutted to the upper ends of the lower bending plates 27 on the corresponding sides under the elastic action of the supporting plate springs 17 on the corresponding sides, and accordingly the plates can be supported when being bent.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Claims

1. The utility model provides an adjustable cambered surface bender of angle of folding, includes base (10), its characterized in that: a supporting mechanism for supporting a workpiece is arranged on the upper side of the base (10), a lifting plate (15) is arranged on the upper side of the base (10), and an angle adjusting mechanism for adjusting the bending angle is arranged on the upper side of the lifting plate (15);

the supporting mechanism comprises two lower bending plates (27) hinged to the upper end face of the base (10), the two lower bending plates (27) are arranged in a bilateral symmetry mode, the outer end faces of the two lower bending plates (27) are hinged to lower chain connecting rods (25), and the lower ends of the two lower chain connecting rods (25) are hinged to thread blocks (26);

angle adjustment mechanism is including adjusting seat (20), be provided with in adjusting seat (20) and go up screw thread piece (45), it all articulates at both ends has last connecting rod (43), two to go up screw thread piece (45) and control both ends go up connecting rod (43) lower extreme and all articulate and have board (22) of bending on, it is fixed with a central section of thick bamboo (23) to adjust seat (20) downside, the equal sliding fit in a central section of thick bamboo (23) left and right sides has board (22) of bending on, two go up board (22) the medial surface of bending respectively with correspond the side go up connecting rod (43) lower extreme articulated.

2. Bending machine for cambered surfaces with adjustable bending angle according to claim 1, characterized in that: two thread block cavities (29) with upward openings are arranged in the base (10), the two thread block cavities (29) are respectively in sliding fit with the thread blocks (26) on the corresponding sides, the two lower bending plates (27) are positioned between the thread block cavities (29) on the left side and the right side, a transmission cavity (47) is arranged between the two thread block cavities (29), a bevel gear cavity (37) is arranged at the rear side of the transmission cavity (47), bevel gear cavities (12) are arranged at the outer sides of the two thread block cavities (29), a synchronous shaft (28) is arranged in the transmission cavity (47), the left side part and the right side part of the synchronous shaft (28) extend outwards to penetrate through the thread block cavity (29) on the corresponding side to the bevel gear cavity (12) on the corresponding side, the two thread blocks (26) are in threaded fit with the synchronous shaft (28), and a driving bevel gear (46) positioned in the transmission cavity (47) is fixed on the synchronous shaft (28).

3. Bending machine for cambered surfaces with adjustable bending angle according to claim 2, characterized in that: an upper threaded block cavity (44) which is through from left to right is formed in the adjusting seat (20), the upper threaded block (45) is in sliding fit with the upper threaded block cavity (44), a screw shaft (42) is in rotating fit with the lower end wall of the upper threaded block cavity (44), the upper side portion of the screw shaft (42) extends upwards to penetrate through the upper threaded block cavity (44) to the inner end wall of the upper threaded block cavity (44), the upper threaded block (45) is in threaded fit with the screw shaft (42), a central shaft (19) is fixed in the central cylinder (23), the front portion and the rear portion of the central shaft (19) both extend outwards to the outside of the central cylinder (23), two rotating blocks (33) which are symmetrical from front to back are in rotating fit on the central shaft (19), the two rotating blocks (33) are respectively located on the front side and the rear side of the central cylinder (23), and the rotating block (33) on the front side is fixedly connected with the upper bending plate (22) on the right side, the rotating block (33) on the rear side is fixedly arranged with the upper bending plate (22) on the left side, and the outer end faces of the two upper bending plates (22) are tangent to the periphery of the central cylinder (23).

4. Bending machine for cambered surfaces with adjustable bending angle according to claim 1, characterized in that: be equipped with logical chamber (24) that link up from top to bottom in lifter plate (15), two bend down board (27) and all run through lead to chamber (24), lead to chamber (24) the left and right sides and all communicate and be equipped with backup pad chamber (16), two equal sliding fit has backup pad (18), two in backup pad chamber (16) backup pad (18) and the side that corresponds all be fixed with backup pad spring (17), two between backup pad chamber (16) diapire backup pad (18) are corresponding the side respectively bend down board (27) butt.

5. Bending machine for cambered surfaces with adjustable bending angle according to claim 2, characterized in that: the tail ends of the left side and the right side of the synchronizing shaft (28) are respectively fixed with a driving bevel gear (11), the inner walls of the upper end of the two bevel gear cavities (12) are respectively and rotatably matched with a screw rod (14), the upper side parts of the two screw rods (14) upwards extend out of the base (10), the lower side parts of the two screw rods downwards extend into the bevel gear cavities (12) on the corresponding side, the tail ends of the lower sides of the two screw rods (14) are respectively and fixedly provided with a driven bevel gear (13) meshed with the driving bevel gear (11) on the corresponding side, and the two screw rods (14) are respectively and threadedly matched with the lifting plate (15).

6. Bending machine for cambered surfaces with adjustable bending angle according to claim 3, characterized in that: two supporting seats (21) are fixed on the upper end face of the base (10), the two supporting seats (21) are symmetrically arranged in front and back by taking the lower bending plate (27) as a center, lifting block cavities (39) with inward openings are arranged in the two supporting seats (21), lifting blocks (31) are arranged in the two lifting block cavities (39) in a sliding fit mode, the two lifting blocks (31) are respectively fixed on the front end face and the back end face of the adjusting seat (20), a motor (34) fixedly arranged on the supporting seat (21) on the front side is arranged on the lower side of the lifting block cavity (39) on the front side, the upper end of the motor (34) is in power connection with a motor shaft (32), the upper side part of the motor shaft (32) extends upwards to penetrate through the lifting block cavity (39) at the front side to the inner side of the upper end wall of the lifting block cavity (39) at the front side, the motor shaft (32) is in threaded fit with the lifting block (31) on the front side.

7. Bending machine for cambered surfaces with adjustable bending angle according to claim 6, characterized in that: the upper side of the upper threaded block cavity (44) is provided with a belt cavity (41), the rear side part of the belt cavity (41) extends backwards into the lifting block (31) at the rear side, the upper side part of the screw shaft (42) extends upwards to penetrate through the belt cavity (41) to the outside of the adjusting seat (20), an annular seat (49) is rotationally matched in the lower end wall of the belt cavity (41), the upper side part of the annular seat (49) extends upwards into the belt cavity (41), two belt wheels (48) which are symmetrical front and back are arranged in the belt cavity (41), a belt (30) is in power fit between the two belt wheels (48), the belt wheel (48) at the front side is fixed at the tail end of the upper side of the screw shaft (42), and the belt wheel (48) at the rear side is fixed on the upper end face of the annular seat (49).

8. Bending machine for cambered surfaces with adjustable bending angle according to claim 7, characterized in that: the transmission shaft (40) is matched with the inner spline of the belt wheel (48), the upper side part of the transmission shaft (40) upwards extends into the upper end wall of the lifting block cavity (39) at the rear side, the lower side part downwards extends into the helical gear cavity (37), the transmission shaft (40) penetrates through the lifting block (31) at the rear side and the lifting block cavity (39) at the rear side, a driven helical gear (38) is fixed at the tail end of the lower side of the transmission shaft (40), a helical gear shaft (35) is matched with the rear end wall of the transmission cavity (47) in a rotating manner, the front side part of the helical gear shaft (35) forwards extends into the transmission cavity (47), the rear side part backwards extends into the helical gear cavity (37), synchronous helical gears (36) are fixed at the tail ends of the front side and the rear side of the helical gear shaft (35), and the synchronous helical gears (36) at the rear side are meshed with the driven helical gear (38), the front side of the timing bevel gear (36) meshes with the driving bevel gear (46).