Bending die mechanism with telescopic die head and bending machine

Abstract

The invention discloses a bending die mechanism with a telescopic die head and a bending machine. According to the bending machine, operation switching of different die heads is achieved through stretching and retracting of the die heads of the two bending die mechanisms. The bending die mechanism comprises a die head telescopic bottom plate and a telescopic driving plate. The telescopic driving plate is contained in a driving groove in the die head telescopic bottom plate. And a driving roller and a driving wedge block with a driving inclined surface are arranged on the telescopic driving plate. And the die head telescopic bottom plate is provided with a roller driving groove matched with the driving roller and a driven inclined surface block with a driven inclined surface matched with the driving inclined surface. And a friction block with high elastic modulus is arranged at the top of the passive inclined plane block. The telescopic driving plate is driven by the telescopic driving cylinder to move horizontally in the long strip direction, and the die head telescopic bottom plate and the die head stretch out and draw back in the direction perpendicular to the long strip direction through the action of the driving inclined face, the driven inclined face and the driving rolling wheel in the rolling wheel driving groove. And when the die head extends out, the friction block is tensioned, so that slipping movement between the telescopic driving plate and the die head telescopic bottom plate is avoided.

Description

Technical Field

[0001] The invention relates to a sheet metal bending machine. Background Art

[0002] In the complex sheet bending process, only one bending die is often not enough to achieve the bending of the sheet. In order to complete the bending of complex sheets, two or more bending machines are usually required in the prior art to match the different required dies. One feasible idea is to directly set two or more bending dies in a bending machine, and switch between different bending dies when necessary. But how to achieve the switching of the bending die, and how to maintain sufficient physical strength of the switched bending die so that it can process harder plates such as stainless steel. Summary of the invention

[0003] The problem to be solved by the present invention is to realize complex bending process for plates made of relatively hard materials such as stainless steel.

[0004] To solve the above problems, the solution adopted by the present invention is as follows: A bending die mechanism with a retractable die head according to the present invention comprises a retractable die head bottom plate and a retractable driving plate; the retractable die head bottom plate is a long strip plate body with a dividing ridge in the middle in the direction of the long strip; the two sides of the dividing ridge are respectively a driving groove and a die head mounting groove; the retractable driving plate is arranged in the driving groove and is connected with a retractable driving cylinder; the die head mounting groove is provided with a bending die head part of which the die head extends out of the die head mounting groove; the retractable die head bottom plate is arranged on the die head mounting frame via a retractable sliding track relative to the back side of the dividing ridge, so that the retractable die head bottom plate can translate along the retractable sliding track in a direction perpendicular to the long strip of the retractable die head bottom plate; the retractable driving plate A driving roller and a driving wedge block with a driving inclined surface are arranged on the plate; a passive inclined surface block with a passive inclined surface is arranged on the side of the dividing ridge of the die head telescopic bottom plate facing the driving groove; a roller driving groove with an oblique angle consistent with the passive inclined surface is arranged in the driving groove; the driving roller is accommodated in the roller driving groove; when the driving roller rolls obliquely along the roller driving groove, the driving inclined surface of the driving wedge block and the passive inclined surface of the passive inclined surface block can move in close contact, so that the movement of the telescopic driving plate in the long strip direction driven by the telescopic driving cylinder drives the die head telescopic bottom plate to telescope in a direction perpendicular to the long strip.

[0005] Further, according to the bending die mechanism of the present invention, the distance between the opposite surfaces on both sides of the roller driving groove body is greater than the diameter of the driving roller by no more than 1 mm.

[0006] Further, according to the bending die mechanism of the present invention, the roller drive groove is connected to a groove body parallel to the long strip direction at the end away from the die head mounting groove; the passive bevel block of the passive bevel block is connected to an extended support surface parallel to the long strip direction at the end away from the die head mounting groove; and the driving wedge block is provided with an extended driving surface matching the extended support surface.

[0007] Further, according to the bending die mechanism of the present invention, a friction block mounting groove is provided on the top of the passive inclined plane block, and a friction block is provided in the friction block mounting groove; the top end portion of the passive inclined plane and the protruding supporting surface are constructed by the friction block; the friction block is made of hard rubber with a high elastic modulus.

[0008] Further, according to the bending die mechanism of the present invention, an auxiliary passive block having an auxiliary passive inclined surface is also provided on the side of the die head telescopic bottom plate dividing ridge facing the driving groove; an auxiliary driving block having an auxiliary driving inclined surface is also provided on the telescopic driving plate; when the driving inclined surface and the passive inclined surface move in conjunction with each other, the auxiliary driving inclined surface and the auxiliary passive inclined surface move in conjunction with each other; when the extended driving surface moves to the friction block, the auxiliary passive block is separated from the auxiliary driving block.

[0009] Further, according to the die head retractable bending die mechanism of the present invention, the driving wedge block and the driving roller constitute a retractable driving unit, and a plurality of retractable driving units are provided on the retractable driving plate; matching the retractable driving unit, the passive inclined plane block and the roller driving groove constitute a retractable passive unit, and the die head retractable bottom plate is provided with the same number of retractable passive units as the retractable driving units.

[0010] Furthermore, according to the bending die mechanism of the present invention, it also includes a driving limit plate arranged on the die head mounting frame; the driving limit plate covers the driving groove, so that the driving groove forms a receiving cavity for receiving the telescopic driving plate; a translation slot is provided on the side of the telescopic driving plate facing the driving limit plate; the movement and guidance of the telescopic driving plate are realized by the engagement of the translation slot and the driving limit plate.

[0011] A bending machine according to the present invention comprises a bending mechanism, which comprises a support plate, a turning frame and the above-mentioned bending die mechanism; the support plate is provided with an arc-shaped notch; there are 2N support plates, which are vertically arranged and parallel to each other, and the arc-shaped notches are oriented in the same direction; the bending die mechanism vertically passes through the support plate via the arc-shaped notch; every two adjacent support plates form a group, forming N plate frame units, and an arc track is arranged on the inner side of two support plates of the plate frame unit along the edge of the arc-shaped notch; the turning frame is composed of N turning supports; the turning support comprises an arc-shaped tooth plate and two Track bracket plate; the arc-shaped tooth plate is clamped between two track bracket plates; the outer side of the track bracket plate is provided with a track outer arc wheel and a track inner arc wheel for clamping the arc track, so that the flip bracket is located between the two intermediate plates of the plate frame unit; the arc-shaped tooth plate is connected to the flip power mechanism by gear meshing; the die head mounting frame is composed of the track bracket plates; the telescopic sliding track is composed of the card slide bar arranged on the outer side of the track bracket plate; the telescopic bottom plate of the die head realizes telescopic guidance through the engagement of the card slide groove on the track mounting block with the card slide bar.

[0012] Further, according to the bending machine of the present invention, there are two bending die mechanisms; when the die heads of the two bending die mechanisms are extended and retracted along with the die head retractable bottom plate, the die heads of the two bending die mechanisms are both extended and retracted in the meridian direction of the center of the arc track, and the extension and retraction directions of the two die heads have a certain angle relative to the center of the circle.

[0013] Furthermore, according to the bending machine of the present invention, there are two bending mechanisms; the two bending mechanisms are arranged opposite to each other, and the distance between the two bending mechanisms can be adjusted under the drive of a motor.

[0014] The technical effects of the present invention are as follows: The present invention realizes the switching of two different die heads by arranging two retractable bending die mechanisms, thereby realizing the bending processing of complex sheet materials.

[0015] The bending die mechanism of the present invention avoids slipping movement between the telescopic driving plate and the telescopic bottom plate of the die head by tensioning the friction block when extending, and at the same time ensures the physical strength required for the die head to extend during processing.

[0016] The present invention can improve the physical strength of the support required for the turning of the bending die head by increasing the configuration of the plate rack unit, and ensure the turning power required for the bending of the hard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a bending machine embodiment.

[0018] Figure 2 It is a structural schematic diagram of the bending mechanism of the embodiment from a first viewing angle.

[0019] Figure 3 It is a structural schematic diagram of the bending mechanism of the embodiment from a second viewing angle.

[0020] Figure 4 It is a schematic diagram of the matching structure of the die head mounting frame and the bending die head mechanism in the embodiment.

[0021] Figure 5 yes Figure 4 Enlarged view of the dashed box R part.

[0022] Figure 6 It is a structural schematic diagram of the telescopic drive plate of the embodiment.

[0023] Figure 7 It is an enlarged view of the end of the telescopic drive plate of the embodiment.

[0024] Figure 8 It is a structural schematic diagram of the die head telescopic plate of the embodiment.

[0025] Fig. 9 It is an enlarged view of the end of the telescopic plate of the die head in the embodiment.

[0026] Fig.10 1. It is a diagram showing the coordination relationship between the telescopic driving plate and the die telescopic plate of the embodiment.

[0027] in, Figure 2 and Figure 3 The rightmost bracket plate is hidden, and part of the fixed bracket plate between the bracket plates is hidden; Figure 7 relatively Figure 6 This is the rear side perspective.

[0028] In the above figures, 100 is a bending mechanism, 1 is a frame, 10 is a plate rack unit, 11 is a bracket plate, 111 is an arc-shaped notch, 112 is an arc-shaped track, and 12 is a fixed plate rack; 2 is a turning frame, 20 is a turning bracket, 21 is an arc tooth plate, 22 is a track bracket plate, 23 is a track outer arc wheel, 24 is a track inner arc wheel, 25 is a card slide bar, 28 is a telescopic sliding track, and 29 is a die head mounting frame; 3 is a turning power mechanism, 31 is a gear, 32 is a turning synchronous shaft, and 33 is a turning motor; 4 is a bending die head mechanism, 40 is a bending die head unit; 41 is the telescopic bottom plate of the die head, 410 is the telescopic passive unit, 4101 is the dividing ridge, 4102 is the driving groove, 4103 is the die head mounting groove, 411 is the passive inclined plane block, 4110 is the friction block mounting groove, 4111 is the passive inclined plane, 4112 is the extending support surface, 4113 is the retracting support surface, 412 is the roller driving groove, 4121 is the retracting support position, 4122 is the extending support position, 4123 is the extending rolling surface, 4124 is the retracting rolling surface, 413 is the friction block, 414 is the auxiliary passive block, and 4141 is the auxiliary passive inclined plane; 42 is a telescopic driving plate, 420 is a telescopic driving unit, 421 is a driving wedge block, 4211 is a driving inclined plane, 4212 is an extended driving plane, 4213 is a roller mounting groove, 422 is a driving roller, 423 is a translation slot, 424 is an auxiliary driving block, 4241 is an auxiliary driving inclined plane, and 429 is a driving connection part; 43 is a track mounting block, 431 is a card slide slot, 48 is a bending die head component, 481 is a die head, and 49 is a telescopic drive cylinder; 5 is a padding frame plate, 6 is a pressing mechanism, 61 is a pressing frame plate, and 62 is a pressing cylinder; 900 is a frame base, 910 is a translation slide rail, 920 is a translation drive mechanism, 921 is a translation motor, 922 is a lead screw, 923 is a translation synchronization shaft, and 924 is a rotation reversing mechanism. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] Figure 1 An example of a bending machine is provided, including two bending mechanisms 100 arranged opposite to each other on a frame base 900. The spacing between the two bending mechanisms 100 is adjustable under the drive of a motor. Specifically in this embodiment, a plurality of parallel translation rails 910 are arranged on the frame base 900, and the bending mechanism 100 is mounted on the translation rails 910 through sliders so that the bending mechanism 100 can translate along the translation rails 910. The bending mechanism 100 is connected to a translation drive mechanism 920. The translation drive mechanism 920 includes a translation motor 921 and a lead screw 922. The translation motor 921 is connected to two lead screws 922 through a translation synchronization shaft 923 and a rotation reversing mechanism 924. The two lead screws 922 are respectively located on both sides, parallel to the translation rails 910, and connected to the bending mechanism 100 through a threaded sleeve. Thus, the translation motor 921 drives the lead screw 922 to rotate, and drives the bending mechanism 100 to translate through the action of the lead screw thread sleeve, so that the two bending mechanisms 100 can move toward or away from each other, thereby adjusting the distance between the two bending mechanisms 100.

[0031] Bending mechanism 100, see Figure 2 and Figure 3, including a frame 1, a turning frame 2, a bending die head mechanism 4, a pad frame plate 5 and a pressing mechanism 6. Among them, the turning frame 2 is arranged on the frame 1 and is connected to the turning power mechanism 3; the bending die head mechanism 4 is arranged on the turning frame 2 and is equipped with a die head; thus, under the drive of the turning power mechanism 3, the turning frame 2 drives the bending die head mechanism 4 to turn over so as to realize the sheet bending operation of the die head. The pad frame plate 5 and the pressing mechanism 6 are arranged relatively up and down, and are used to clamp and fix the sheet when the sheet is bent. Among them, the pressing mechanism 6 includes a pressing frame plate 61 and a pressing cylinder 62 connected to the pressing frame plate 61. The pressing frame plate 61 is arranged on the frame 1 through a vertically arranged slide rail and a slider, can be raised and lowered, and is located directly above the vertically arranged pad frame plate 5. Driven by the pressing cylinder 62, the pressing frame plate 61 is pressed downward, so that the bottom surface of the pressing frame plate 61 and the top surface of the pad frame plate 5 clamp the sheet. The pressing cylinder 62 can be a gas cylinder or a hydraulic cylinder. The structure and working mode of the padding frame plate 5 and the pressing mechanism 6 are well known to those skilled in the art, and will not be described in detail in this specification.

[0032] The frame 1 includes a plurality of support plates 11 and a plurality of fixed frame plates 12. The support plates 11 are vertically arranged and parallel to each other. The support plates 11 are connected and fixed by the fixed frame plates 12. Each support plate 11 is provided with an arc-shaped notch 111, and the arc-shaped notches 111 on each support plate 11 are oriented in the same direction, so that each support plate 11 forms an arc-shaped receiving space at the arc-shaped notch 111. The bending die head mechanism 4 is arranged in the arc-shaped receiving space. In other words, the horizontally arranged bending die head mechanism 4 vertically passes through each vertically arranged support plate via the arc-shaped notch 111.

[0033] In this embodiment, the flip rack 2 is composed of a plurality of flip racks 20. The number of the bracket plates 11 is an even number, that is, there are 2N, and each two adjacent bracket plates 11 form a group to form N rack units 10. That is, each rack unit 10 includes two bracket plates 11, and corresponds to the flip rack 20. That is, the number of flip racks 20 is the same as the number of rack units 10, and each flip rack 20 is respectively arranged on the rack unit 10 and located between the two bracket plates 11 of the rack unit 10. That is, there are N flip racks 20. Specifically in this embodiment, N is 5, there are 10 bracket plates 11, and there are 5 rack units 10 and flip racks 20. The inner side of the two bracket plates 11 of the rack unit 10 is provided with an arc track 112 along the edge of the arc notch 111. The flip rack 20 is arranged between the two bracket plates 11 of the rack unit 10 through the arc track 112.

[0034] Reference Figure 4 and Figure 5The flip bracket 20 includes an arc-shaped tooth plate 21 and two track bracket plates 22. The arc-shaped tooth plate 21 is clamped and fixed between the two track bracket plates 22. The arc-shaped tooth plate 21 and the track bracket plate 22 are preferably fixed by bolts. The outer side surface of the track bracket plate 22 is provided with a plurality of track outer arc wheels 23 and a plurality of track inner arc wheels 24. The outer side surface here is the opposite surface relative to the inner side surface that fits the arc-shaped tooth plate 21. The flip bracket 20 clamps the arc track 112 through the track outer arc wheels 23 and the track inner arc wheels 24, so that the two sides of the flip bracket 20 are respectively mounted on the arc track 112 set on the inner sides of the two bracket plates 11 of the plate frame unit 10, so that the flip bracket 20 can perform circular motion along the arc track 112 to achieve flipping operation.

[0035] The arc-shaped toothed plate 21 is connected to the flipping power mechanism 3 by gear meshing. Specifically in the present embodiment, meshing teeth are provided on the arc edge of the arc-shaped toothed plate 21. The flipping power mechanism 3 includes a gear 31, a flipping synchronization shaft 32 and a flipping motor 33. The flipping synchronization shaft 32 is horizontally mounted on the frame 1 through bearings provided on each bracket plate 22, and the gear 31 is provided on the flipping synchronization shaft 32, and is connected to the flipping motor 33 through the flipping synchronization shaft 32. The gear 31 on the flipping synchronization shaft 32 corresponds to the arc-shaped toothed plate 21. That is, the number of gears 31 and the arc-shaped toothed plate 21 is the same, and each gear 31 is respectively meshed with the corresponding arc-shaped toothed plate 21. Thus, the flipping motor 33 drives the gear 31 to rotate to drive the flip bracket 20 to flip.

[0036] In this embodiment, the bending die head mechanism 4 provided on the flip frame 2 is composed of two bending die head units 40. The bending die head unit 40 is the bending die mechanism referred to in the present invention, which is a bending die mechanism with a retractable die head. Thus, the bending die head mechanism 4 realizes the die head switching on the two bending die head units 40 by retracting the die head. The bending die mechanism, i.e., the bending die head unit 40, includes a die head retractable bottom plate 41 and a retractable driving plate 42. The die head retractable bottom plate 41 and the retractable driving plate 42 are both long strip-shaped plates.

[0037] Reference Figure 8 , Fig. 9 and Fig.10, a dividing ridge 4101 in the long strip direction is provided in the middle of the die telescopic bottom plate 41. The dividing ridge 4101 is a protrusion on the plate body, and correspondingly, the two sides of the dividing ridge 4101 are respectively a driving groove 4102 and a die mounting groove 4103. The die mounting groove 4103 is used to install the bending die head component 48. The bending die head component 48 includes a connected installation connecting strip and a die head 481. Among them, the installation connecting strip is arranged in the die head mounting groove 4103 by bolt fixing, and the die head 481 extends out of the die head mounting groove 4103. The driving groove 4102 is used to accommodate the telescopic driving plate 42. The die head telescopic bottom plate 41 is arranged on the die head mounting frame 29 through the telescopic sliding track 28 relative to the back side of the dividing ridge 4101, so that the die head telescopic bottom plate 41 can be translated along the telescopic sliding track 28 in a direction perpendicular to the long strip of the die head telescopic bottom plate 41, thereby realizing the telescopic translation of the die head 481. When the die head 481 is extended and retracted along with the die head retractable bottom plate 41, it is extended and retracted in the longitudinal direction with respect to the center of the arc track 112. The extension and retraction directions of the die heads 481 of the two bending die head units 40 have a certain angle with respect to the center of the arc track 112. The angle is usually 50-70 degrees.

[0038] More specifically, the die mounting frame 29 is composed of each track bracket plate 22. A card slide 25 is arranged on the outer side surface of each track bracket plate 22. There are two card slides 25 arranged on the outer side surface of the track bracket plate 22, which correspond to two bending die units 40 respectively. The angle between the telescopic directions of the die heads 481 of the two bending die units 40 referred to above is also the angle between the two card slides 25 arranged on the outer side surface of the track bracket plate 22. A track mounting block 43 is fixedly arranged on the die telescopic bottom plate 41 relative to the back side of the dividing ridge 4101. A card slide groove 431 is arranged on the track mounting block 43. The card slide groove 431 is adapted to and engaged with the card slide 25. Through the engagement of the card slide 25 and the card slide groove 431 of the track mounting block 43, the telescopic translation guidance of the die telescopic bottom plate 41 and the die head 481 and the support of the bending die unit 40 are realized. That is to say, the telescopic sliding track 28 mentioned above is composed of the sliding strips 25 on the outer sides of each track bracket plate 22.

[0039] The telescopic driving plate 42 is arranged in the driving groove 4102, and is connected to the telescopic driving cylinder 49 through the driving connection part 429 at the end. More specifically, the die head mounting frame 29 is provided with a driving limit plate 44. That is, the driving limit plate 44 is fixed to the die head mounting frame 29 by fixing with each track support plate 22. The driving limit plate 44 covers the driving groove 4102, so that the driving groove 4102 forms a receiving cavity for receiving the telescopic driving plate 42. The telescopic driving plate 42 is located in the receiving cavity. Figure 6 , Figure 7 and Fig.10A translation slot 423 is provided on one side of the telescopic driving plate 42 facing the driving limit plate 44. The translation slot 423 and the driving limit plate 44 are slidably engaged to guide the movement of the telescopic driving plate 42. The moving direction of the telescopic driving plate 42 is parallel to the long strip direction of the die telescopic bottom plate 41 and perpendicular to the telescopic translation direction of the die telescopic bottom plate 41.

[0040] The telescopic driving plate 42 is provided with a plurality of telescopic driving units 420, and the die head telescopic bottom plate 41 is provided with a plurality of telescopic passive units 410. The telescopic passive units 410 correspond to and match the telescopic driving units 420. Fig.10 When the telescopic driving plate 42 moves along the long strip direction in the driving groove 4102 under the drive of the telescopic driving cylinder 49, refer to Fig.10 In the direction of arrow F, through the interaction between the telescopic passive unit 410 and the telescopic driving unit 420, the die head telescopic bottom plate 41 is driven to translate in a direction perpendicular to the long strip, referring to Fig.10 In the direction of arrow M, the telescopic translation drive of the die telescopic bottom plate 41 and the die 481 is realized.

[0041] Reference Figure 6 and Figure 7 , combined with Fig.10 The telescopic driving unit 420 on the telescopic driving plate 42 includes a driving wedge block 421 and a driving roller 422 disposed on the telescopic driving plate 42. Figure 8 and Fig. 9 , combined with Fig.10 The telescopic passive unit 410 on the telescopic bottom plate 41 of the die head includes a passive inclined plane block 411 arranged on the side of the dividing ridge 4101 facing the driving groove 4102 and a roller driving groove 412 arranged in the driving groove 4102. The driving wedge block 421 matches the passive inclined plane block 411. More specifically, the driving wedge block 421 is provided with a driving inclined plane 4211, and the passive inclined plane block 411 is provided with a passive inclined plane 4111. The driving inclined plane 4211 and the passive inclined plane 4111 are two matching inclined planes with the same oblique angle. The oblique angle here can be understood as the angle with the direction of the long strip. Therefore, the telescopic driving plate 42 arranged in the driving groove 4102 is moved along Fig.10When moving in the direction of arrow F shown, the driving inclined surface 4211 and the passive inclined surface 4111 fit together and, through the action of the inclined surfaces, exert a force in the direction of arrow M on the die telescopic bottom plate 41, thereby pushing the die telescopic bottom plate 41 and the die 481 to extend outward. The roller drive groove 412 is a groove body with the same oblique angle as the driving inclined surface 4211 and the passive inclined surface 4111, and the two sides of the groove body are the extending rolling surface 4123 and the retracting rolling surface 4124 respectively. The extending rolling surface 4123 and the retracting rolling surface 4124 have the same oblique angle as the driving inclined surface 4211 and the passive inclined surface 4111. The driving roller 422 on the telescopic driving plate 42 is accommodated in the roller drive groove 412. Therefore, when the telescopic driving plate 42 is moved along Fig.10 When moving in the direction of arrow F shown, the driving roller 422 rolls obliquely on the extended rolling surface 4123, and exerts a force in the direction of arrow M on the die telescopic bottom plate 41 through the action with the inclined surface of the extended rolling surface 4123, thereby pushing the die telescopic bottom plate 41 and the die 481 to extend outward. In other words, when the die telescopic bottom plate 41 and the die 481 extend, it is completed under the joint action of the driving inclined surface 4211 of each telescopic driving unit 420 and the passive inclined surface 4111 of each telescopic passive unit 410, as well as the driving roller 422 of each telescopic driving unit 420 and the extended rolling surface 4123 of each telescopic passive unit 410.

[0042] In addition, the top of the driving wedge block 421 is provided with a protruding driving surface 4212, the top of the passive inclined plane block 411 is provided with a protruding supporting surface 4112, and the top of the roller driving groove 412 is provided with a protruding supporting position 4122. The protruding driving surface 4212 and the protruding supporting surface 4112 are both planes parallel to the long strip direction. Here, the top of the passive inclined plane block 411 refers to the part of the passive inclined plane block 411 away from the die head mounting groove 4103, and the protruding supporting surface 4112 is connected to the passive inclined plane 4111; the top of the driving wedge block 421 refers to the farthest part of the driving wedge block 421 protruding outward, and the protruding driving surface 4212 is connected to the driving inclined plane 4211. The protruding supporting position 4122 is a section of the groove body arranged in the long strip direction connecting the roller driving groove 412, and the side edges on both sides of the groove body are planes parallel to the long strip direction. The protruding supporting position 4122 is connected to the end of the roller driving groove 412 away from the die head mounting groove 4103.

[0043] The extended driving surface 4212 matches the extended supporting surface 4112. Fig.10 When the die head 481 moves to the end point in the direction of arrow F, the extended driving surface 4212 on the top of the driving wedge block 421 abuts against the extended supporting surface 4112 on the top of the passive ramp block 411, and the driving roller 422 stays on the extended supporting position 4122. At this time, the die head 481 is in the working state. When the die head 481 needs to retract and switch from the working state to the avoidance state, the telescopic driving plate 421 is retracted to Fig.10The arrow F shown in the figure moves in the opposite direction. At this time, the driving roller 422 rolls obliquely on the retracting rolling surface 4124, and through the inclined surface of the retracting rolling surface 4124, it applies a force in the opposite direction of the arrow M to the die telescopic bottom plate 41, thereby pushing the die telescopic bottom plate 41 and the die 481 to retract inward. At this time, there is usually a certain gap between the driving inclined surface 4211 and the passive inclined surface 4111, and they are not fitted. In other words, the spacing between the opposite surfaces on both sides of the roller driving groove 412 is greater than the diameter of the driving roller 422, resulting in asymmetric extension and retraction of the die telescopic bottom plate 41 and the die 481. The spacing between the opposite surfaces on both sides of the roller driving groove 412 is the spacing between the extending rolling surface 4123 and the retracting rolling surface 4124. Generally speaking, the spacing between the opposite surfaces on both sides of the roller driving groove 412 is greater than the diameter of the driving roller 422 and does not exceed 1mm.

[0044] The extension and retraction of the die head telescopic bottom plate 41 and the die head 481 make the bending die head unit 40 have two states: working state and avoidance state. Only one of the two bending die head units 40 can be in the working state: when one bending die head unit 40 is in the working state, the other bending die head unit 40 needs to be in the avoidance state to make room for the die head 481 in the working state to bend the sheet metal; when the bending machine is not in the working state, the two bending die head units 40 are usually in the avoidance state. Fig.10 The matching relationship between the die telescopic bottom plate 41 and the telescopic driving plate 42 in the example is the matching relationship when the bending die unit 40 is in an avoidance state. At this time, the driving roller 422 is located at the retracted support position 4121 of the roller driving groove 412, and correspondingly, the extended driving surface 4212 of the driving wedge block 421 is located at the retracted support surface 4113. The retracted support position 4121 is the end of the roller driving groove 412 close to the die mounting groove 4103. The retracted support surface 4113 is a plane parallel to the strip direction, connected to the end of the passive inclined surface 4111 close to the die mounting groove 4103.

[0045] In addition, in this embodiment, in order to prevent the telescopic driving plate 42 and the die telescopic bottom plate 41 from slipping against each other when the bending operation is performed in the working state of the bending die unit 40, a friction block mounting groove 4110 is provided at the top of the passive inclined surface block 411, and a friction block 413 is provided in the friction block mounting groove 4110. Thus, the top portion of the passive inclined surface 4111 and the extended support surface 4112 are constructed by the friction block 413. The friction block 413 is made of hard rubber or hard plastic with a high elastic modulus. The high elastic modulus here refers to an elastic modulus of not less than 80 MPa. In this embodiment, the friction block 413 is preferably hard rubber. When the extended driving surface 4212 on the telescopic driving plate 42 is pressed against the extended support surface 4112 in the working state of the bending die unit 40, the extended driving surface 4212 is tensioned and held tightly on the extended support surface 4112 through the elasticity of the friction block 413 itself and the fact that the friction coefficient of the rubber surface itself is much greater than the metal material property.

[0046] In addition, in order to balance the friction force when the driving inclined surface 4211 moves completely on the friction block 413, in this embodiment, an auxiliary passive block 414 with an auxiliary passive inclined surface 4141 is further provided on the side of the separating ridge 4101 of the die telescopic bottom plate 41 facing the driving groove 4103; an auxiliary driving block 424 with an auxiliary driving inclined surface 4241 is also provided on the telescopic driving plate 42. The auxiliary driving inclined surface 4241 matches the auxiliary passive inclined surface 4141, and when the driving inclined surface 4211 and the passive inclined surface 4111 move in close contact, the auxiliary driving inclined surface 4241 and the auxiliary passive inclined surface 4141 move in close contact. When the extended driving surface 4212 moves to the friction block 413, the auxiliary passive block 414 and the auxiliary driving block 424 are separated. When the extended driving surface 4212 moves to the friction block 413, it means that the part of the passive inclined surface 4111 that is in contact with the driving inclined surface 4211 is completely constructed by the friction block 413. At this time, the friction between the telescopic bottom plate 41 of the die head and the telescopic driving plate 42 is relatively large. In this embodiment, the auxiliary driving inclined surface 4241 and the auxiliary passive inclined surface 4141 are set to balance the friction force, so that the friction force on the telescopic driving plate 42 as a whole is relatively stable.

[0047] In addition, in this embodiment, the driving roller 422 is arranged on the driving wedge block 421. More specifically, a roller mounting groove 4213 is arranged on the back side of the driving wedge block 421 relative to the driving roller 422. The roller mounting groove 4213 is used to set the fasteners required for installing the driving roller 422. It is understood by those skilled in the art that the driving roller 422 can also be arranged at other positions, such as being arranged on the auxiliary driving block 424. In addition, it is understood by those skilled in the art that the wheel surface of the driving roller 422 is preferably made of hard rubber or hard plastic with a high elastic modulus.

Claims

1. A bending die mechanism with a retractable die head, characterized in that: The invention comprises a telescopic bottom plate of a die head and a telescopic driving plate; the telescopic bottom plate of the die head is a long strip plate body, and a dividing ridge in the middle is provided; the two sides of the dividing ridge are respectively a driving groove and a die head mounting groove; the telescopic driving plate is arranged in the driving groove and is connected with a telescopic driving cylinder; the die head mounting groove is provided with a bending die head part for the die head to extend out of the die head mounting groove; the telescopic bottom plate of the die head is arranged on the die head mounting frame through a telescopic sliding track relative to the back side of the dividing ridge, so that the telescopic bottom plate of the die head can be translated along the telescopic sliding track in a direction perpendicular to the long strip of the telescopic bottom plate of the die head; the telescopic driving plate is provided with a driving roller and A driving wedge block with a driving inclined surface; a passive inclined surface block with a passive inclined surface is arranged on the side of the die head telescopic bottom plate dividing ridge facing the driving groove; a roller driving groove is arranged in the driving groove with the same oblique angle as the passive inclined surface; the driving roller is accommodated in the roller driving groove; when the driving roller rolls obliquely along the roller driving groove, the driving inclined surface of the driving wedge block and the passive inclined surface of the passive inclined surface block can move in close contact, so that the movement of the telescopic driving plate in the long strip direction driven by the telescopic driving cylinder drives the die head telescopic bottom plate to telescope in a direction perpendicular to the long strip.

2. The bending die mechanism according to claim 1, characterized in that: The distance between the opposite surfaces on both sides of the roller driving groove body is greater than the diameter of the driving roller by no more than 1 mm.

3. The bending die mechanism according to claim 1, characterized in that: The roller driving groove is connected with a groove body parallel to the long strip direction at one end away from the die head mounting groove; the passive bevel block of the passive bevel block is connected with a protruding support surface parallel to the long strip direction at one end away from the die head mounting groove; the driving wedge block is provided with a protruding driving surface matching the protruding support surface.

4. The bending die mechanism according to claim 3, characterized in that: The top of the passive ramp block is provided with a friction block installation groove, and a friction block is arranged in the friction block installation groove; the top end portion of the passive ramp and the extended support surface are constructed by the friction block; the friction block is made of hard rubber or hard plastic with a high elastic modulus.

5. The bending die mechanism according to claim 4, characterized in that: An auxiliary passive block having an auxiliary passive inclined surface is also provided on the side of the die head telescopic bottom plate dividing ridge facing the driving groove; an auxiliary driving block having an auxiliary driving inclined surface is also provided on the telescopic driving plate; when the driving inclined surface and the passive inclined surface move in conjunction with each other, the auxiliary driving inclined surface and the auxiliary passive inclined surface move in conjunction with each other; when the extended driving surface moves to the friction block, the auxiliary passive block is separated from the auxiliary driving block.

6. The bending die mechanism according to any one of claims 1 to 5, characterized in that: The driving wedge block and the driving roller constitute a telescopic driving unit, and a plurality of telescopic driving units are arranged on the telescopic driving plate; matching the telescopic driving unit, the passive inclined plane block and the roller driving groove constitute a telescopic passive unit, and the die head telescopic bottom plate is provided with the same number of telescopic passive units as the telescopic driving units.

7. The bending die mechanism according to any one of claims 1 to 5, characterized in that: It also includes a driving limit plate arranged on the die head mounting frame; the driving limit plate covers the driving groove, so that the driving groove forms a receiving cavity for receiving the telescopic driving plate; a translation slot is provided on the side of the telescopic driving plate facing the driving limit plate; the movement and guidance of the telescopic driving plate are realized by the locking of the translation slot and the driving limit plate.

8. A bending machine, comprising a bending mechanism, characterized in that: The bending mechanism comprises a bracket plate, a turning frame and a bending die mechanism according to any one of claims 1 to 7; the bracket plate is provided with an arc-shaped notch; there are 2N bracket plates, which are vertically arranged and parallel to each other, and the arc-shaped notches are oriented in the same direction; the bending die mechanism vertically passes through the bracket plate via the arc-shaped notch; every two adjacent bracket plates form a group to form N plate rack units, and an arc track is provided on the inner side of two bracket plates of the plate rack unit along the edge of the arc-shaped notch; the turning frame is composed of N turning brackets; the turning bracket comprises an arc-shaped tooth plate and two track supports The frame plate; the arc-shaped toothed plate is clamped between two track bracket plates; the outer side of the track bracket plate is provided with a track outer arc wheel and a track inner arc wheel for clamping the arc track, so that the flip bracket is located between the two intermediate plates of the plate frame unit; the arc-shaped toothed plate is connected to the flipping power mechanism by gear meshing; the die head mounting frame is composed of the track bracket plates; the telescopic sliding track is composed of the card slide bar arranged on the outer side of the track bracket plate; the telescopic bottom plate of the die head realizes telescopic guidance through the engagement of the card slide groove on the track mounting block with the card slide bar.

9. The bending machine according to claim 8, characterized in that: There are two bending die mechanisms; when the die heads of the two bending die mechanisms extend and retract along with the die head retractable bottom plate, the die heads of the two bending die mechanisms both extend and retract in the meridian direction of the center of the arc track, and the extension and retraction directions of the two die heads have a certain angle relative to the center of the circle.

10. The bending machine according to claim 8 or 9, characterized in that: There are two bending mechanisms; the two bending mechanisms are arranged opposite to each other, and the distance between the two bending mechanisms can be adjusted under the drive of a motor.

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