Workpiece edge covering mechanism

Abstract

The workpiece edge covering mechanism comprises a base, a driving part and a mounting block, the driving part and the mounting block are arranged on the base, the mounting block is rotationally connected to the base and hinged to the driving end of the driving part, a pressing cutter is arranged on the mounting block, and the mounting block can drive the pressing cutter to turn over relative to the base under driving of the driving part. And the covered edge of the workpiece is pushed and pressed to the preset angle. According to the workpiece edge covering mechanism, the base is rotationally connected with the mounting block provided with the pressing cutter, and the mounting block is hinged to the driving end of the driving part, so that the mounting block can be driven by the driving part to drive the pressing cutter to turn over relative to the base so as to push and press the covered edge of the workpiece to a preset angle; and only the rotating shafts of the mounting block are arranged between the driving part and the pressing cutter, so that the number of the rotating shafts can be reduced, the consumption of the friction force of the rotating shafts on the driving force can be effectively reduced, the driving force transmitted to the pressing cutter can be amplified, in-place edge covering can be ensured, and the edge covering quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece processing equipment, and particularly relates to a workpiece hemming mechanism. Background Art

[0002] Automobile door covers usually adopt a hemming form. The quality of hemming directly affects people's perception of the vehicle. With the requirements of the body shape and structure, some hemming parts of the door covers are short hemming parts less than 50 mm. At this time, due to structural limitations, only a mechanical flanging mechanism can be used to achieve hemming of 90° - 0°. The existing hemming mechanism is a multi-link mechanism. This mechanism has high requirements for the coaxiality of the connecting rods. Since the multi-link mechanisms are all welded processes, due to tolerance reasons, it is impossible to achieve theoretical coaxiality, so eccentric wear will occur, resulting in an increase in the friction force of the rotating shaft and consuming more driving force. In addition, the driving force decays greatly after being transmitted through multiple connecting rods, making the final pressure mainly pushing, resulting in the inability to hem firmly, so that the hemming quality of the workpiece is poor and difficult to meet the requirements. Moreover, the rotating shaft parts of each connecting rod need to be maintained to prevent the rotating shaft from getting stuck, and the maintenance cost is high. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a workpiece hemming mechanism to improve the hemming quality of the workpiece.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A workpiece hemming mechanism includes a base, a driving part and a mounting block arranged on the base;

[0006] The mounting block is rotatably connected to the base, and is hinged to the driving end of the driving part. A pressing knife is arranged on the mounting block. Driven by the driving part, the mounting block can drive the pressing knife to flip relative to the base to push the hemming of the workpiece to a preset angle.

[0007] Further, a first limiting part and a second limiting part are arranged between the base and the mounting block;

[0008] The first limiting part is used to limit the rotation angle of the mounting block when the pressing knife pushes the hemming of the workpiece;

[0009] The second limiting part is used to limit the rotation angle of the mounting block when the pressing knife returns.

[0010] Further, the first limiting part includes a first limiting block arranged on the base and a first matching block arranged on the mounting block;

[0011] At least one of the first limiting block and the first matching block is provided with a first arc-shaped limiting surface.

[0012] Further, the second limiting portion includes a second limiting block disposed on the base and a second mating block disposed on the mounting block;

[0013] At least one of the second limiting block and the second mating block is provided with a second arc-shaped limiting surface.

[0014] Further, the arrangement position of the pressing knife on the mounting block is adjustable.

[0015] Further, a vertically arranged first mounting hole is provided on the mounting block, a first adjusting hole is provided on the pressing knife, and the aperture of the first adjusting hole is different from that of the first mounting hole;

[0016] The pressing knife is disposed on the mounting block through a first connecting member passing through the first adjusting hole and the first mounting hole.

[0017] Further, a horizontally arranged second mounting hole is provided on the mounting block, a second adjusting hole is provided on the pressing knife, and the aperture of the second adjusting hole is different from that of the second mounting hole;

[0018] The pressing knife is disposed on the mounting block through a second connecting member passing through the second adjusting hole and the second mounting hole.

[0019] Further, the driving portion includes a cylinder rotatably disposed on the base, and a rod end joint bearing is provided on the driving end of the driving portion, and the mounting block is connected to the rod end joint bearing through a connecting shaft.

[0020] Further, connecting ears are provided on the mounting block on both sides of the rod end joint bearing, the connecting shaft passes through the connecting ears, and clamping grooves are respectively provided at both ends of the connecting shaft;

[0021] Limiting pieces are provided on the connecting ears, and part of the limiting pieces are clamped in the clamping grooves to prevent the connecting shaft from disengaging from the connecting ears.

[0022] Further, a first sensing portion and a second sensing portion are provided on the base at intervals, and a detection piece with a notch is provided on the mounting block;

[0023] The first sensing portion is used to sense the detection piece when the pressing knife is in the initial position of pushing, the second sensing portion is used to sense the detection piece when the pressing knife pushes the edge of the workpiece, and when the second sensing portion senses the detection piece, the notch is aligned with the first sensing portion.

[0024] Compared with the prior art, the present utility model has the following advantages:

[0025] The edge wrapping mechanism of the workpiece described in the present utility model rotates and connects an installation block with a pressing knife on a base, and the installation block is hinged to the driving end of the driving part. Thus, the installation block can drive the pressing knife to flip relative to the base under the drive of the driving part to push the edge of the workpiece to a preset angle. Moreover, there is only the rotating shaft of the installation block between the driving part and the pressing knife in this edge wrapping mechanism, which can reduce the number of rotating shafts, effectively reduce the consumption of driving force by the friction of the rotating shafts, and is also beneficial to amplifying the driving force transmitted to the pressing knife, thereby ensuring that the edge wrapping is in place and improving the edge wrapping quality.

[0026] In addition, by arranging a first limiting part and a second limiting part between the base and the installation block, it can prevent the pressing knife from excessively pressing the workpiece and reduce the edge wrapping quality of the workpiece. The first limiting part includes a first limiting block and a first mating block, with a simple structure and being convenient for design and implementation. The first limiting block and the first mating block are in contact through a first arc-shaped limiting surface, which can effectively reduce the contact area between the two while achieving limiting, and prevent interference with the installation block.

[0027] Secondly, the second limiting part includes a second limiting block and a second mating block, with a simple structure and being convenient for design and implementation. The second limiting block and the second mating block are in contact through a second arc-shaped limiting surface, which can also effectively reduce the contact area between the two and prevent interference with the installation block. Making the arrangement position of the pressing knife on the installation block adjustable is convenient for on-site adjustment of the position of the pressing knife, can solve the problem of inaccurate processing accuracy, and is beneficial to improving the edge wrapping quality of the workpiece. By arranging a vertically arranged first installation hole on the installation block and a first adjustment hole on the pressing knife, and making the aperture of the first adjustment hole different from that of the first installation hole, this structure is convenient for adjusting the position of the pressing knife in the horizontal and left-right directions, with a simple structure and being easy to adjust.

[0028] In addition, by arranging a horizontally arranged second installation hole on the installation block and a second adjustment hole on the pressing knife, and making the aperture of the second adjustment hole different from that of the second installation hole, the position of the pressing knife in the vertical and left-right directions can be adjusted, which can further adjust the position of the pressing knife, and has a simple structure and is easy to adjust. A rod end spherical bearing is arranged on the driving end of the driving part, and the installation block is connected to the rod end spherical bearing through a connecting shaft, which can effectively eliminate the axial deviation of the rotating shaft of the installation block, thereby solving the problem of large partial wear resistance and consuming more driving force caused by non-coaxiality.

[0029] In addition, by arranging clamping grooves at both ends of the connecting shaft and arranging limiting pieces partially clamped in the clamping grooves on the connecting ears, the connecting shaft can be prevented from disengaging from the connecting ears. At the same time, this structure is also convenient for the connection between the installation block and the rod end spherical bearing and is convenient for visual inspection. By arranging a first sensing part and a second sensing part on the base, it is convenient to obtain the motion state of this workpiece edge wrapping mechanism, which is beneficial to intelligent design. Description of the Drawings

[0030] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0031] Figure 1 It is a schematic structural diagram of the part edge - wrapping mechanism of the present utility model according to an embodiment;

[0032] Figure 2 It is a schematic structural diagram of the part edge - wrapping mechanism of the present utility model from another perspective;

[0033] Figure 3 It is a schematic structural diagram of the part edge - wrapping mechanism of the present utility model from yet another perspective;

[0034] Figure 4 It is a schematic structural diagram of the base of the present utility model according to an embodiment;

[0035] Figure 5 It is a schematic structural diagram of the base of the present utility model from another perspective;

[0036] Figure 6 It is a schematic structural diagram of the mounting block of the present utility model when it is equipped with a detection piece according to an embodiment;

[0037] Figure 7 It is a schematic structural diagram of the mounting block of the present utility model according to an embodiment;

[0038] Figure 8 It is a schematic structural diagram of the mounting block of the present utility model from another perspective;

[0039] Figure 9 It is a schematic structural diagram of the mounting block of the present utility model from yet another perspective;

[0040] Figure 10 It is an assembly state diagram of the rod - end spherical plain bearing and the connecting shaft of the present utility model according to an embodiment;

[0041] Figure 11 It is a schematic structural diagram of the pressing knife of the present utility model according to an embodiment;

[0042] Figure 12 It is a schematic structural diagram of the pressing knife of the present utility model from another perspective.

[0043] Explanation of reference numerals:

[0044] 1. Base; 2. Cylinder; 3. Mounting block; 4. Pressing knife; 5. First limiting block; 6. First mating block; 7. Second limiting block; 8. Second mating block; 9. Detection piece; 10. Support plate; 11. Rotating shaft; 12. Connecting shaft; 13. Limiting piece; 14. Fourth gasket; 15. Fifth gasket; 16. Bracket; 17. First gasket; 18. Second gasket; 19. Third gasket; 20. Rod end spherical bearing

[0045] 101. Mounting plate; 102. Column; 103. Fixed block; 104. Connecting plate

[0046] 301. Mounting body; 302. Connecting arm; 303. Limiting arm

[0047] 401. Tool block; 4011. First adjustment hole; 402. Extension plate; 4022. Second adjustment hole

[0048] 1201. Card slot Detailed implementation mode

[0049] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting piece" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0052] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0053] In view of the fact that the hemming mechanism in the prior art is a multi-link mechanism, there are problems such as an increase in the friction force of the rotating shaft, consumption of more driving force, and a large attenuation of the driving force after being transmitted through multiple links, resulting in the final pressure mainly relying on pushing, making it impossible to hem tightly, and the hemming quality of the workpiece being poor and difficult to meet the requirements. Therefore, in this embodiment, a novel workpiece hemming mechanism is specifically proposed. In terms of the overall composition, it includes a base 1, as well as a driving part and a mounting block 3 provided on the base 1.

[0054] Among them, the mounting block 3 is rotatably connected to the base 1 and is hinged to the driving end of the driving part. Moreover, a pressing knife 4 is provided on the mounting block 3. Driven by the driving part, the mounting block 3 can drive the pressing knife 4 to flip relative to the base 1 to press the hemming of the workpiece to a preset angle.

[0055] For the workpiece hemming mechanism of this embodiment, by rotatably connecting the mounting block 3 provided with the pressing knife 4 to the base 1 and making the mounting block 3 hinged to the driving end of the driving part, thus, the mounting block 3 can drive the pressing knife 4 to flip relative to the base 1 under the drive of the driving part to press the hemming of the workpiece to a preset angle. And, there is only the rotating shaft 11 of the mounting block 3 between the driving part and the pressing knife 4 in this hemming mechanism, which can reduce the number of rotating shafts 11, thereby effectively reducing the consumption of the driving force by the friction force of the rotating shaft 11, and also being beneficial to amplifying the driving force transmitted to the pressing knife 4, and then being able to ensure that the hemming is in place and improve the hemming quality.

[0056] Based on the above overall introduction, an exemplary structure of the workpiece hemming mechanism of this embodiment is referred to Figures 1 to 3 as shown in. Among them, as described above, the mounting block 3 of this embodiment is arranged on the base 1 in a lever structure, thereby increasing the distance between the hinge point of the mounting block 3 and the driving end and its rotating shaft 11, so as to better amplify the driving force transmitted to the pressing knife 4, and then being beneficial to ensuring that the workpiece is properly hemmed and improving the hemming quality.

[0057] In addition, as a preferred embodiment, the driving part includes a cylinder 2 rotatably arranged on the base 1, and a rod end spherical bearing 20 is provided on the driving end of the driving part. The mounting block 3 is connected to the rod end spherical bearing 20 through a connecting shaft 12. In this embodiment, the rod end spherical bearing 20 is provided on the driving end of the driving part and the mounting block 3 is connected to the rod end spherical bearing 20 through the connecting shaft 12, which can effectively eliminate the axial deviation of the rotating shaft 11 of the mounting block 3, thus solving the problems of large abrasion resistance and consumption of more driving force caused by non-alignment. It should be noted that the driving part can also use a motor that outputs linear power in addition to using the cylinder 2.

[0058] Among them, as a preferred embodiment, the structure of the base 1 of this embodiment is as shown in Figure 4 and Figure 5As shown in the figure, it includes a mounting plate 101, a column 102 and a connecting plate 104 provided at the bottom of the mounting plate 101, and a fixing block 103 provided at the top of the mounting plate 101. Among them, the column 102 extends downward as a whole, and fixing plates are respectively provided at its upper and lower ends. It is connected to the mounting plate 101 through the fixing plate at the upper end and can be connected to an external carrier through the fixing plate at the lower end. In addition, to improve the setting stability of the above-mentioned cylinder 2 on the base 1, as Figure 4 As shown in the figure, as a preferred embodiment, there are two connecting plates 104 provided on two opposite sides of the mounting plate 101 in this embodiment, and through holes are provided on each connecting plate 104. The cylinder 2 seat is connected in the through hole through a shaft body, so that the cylinder 2 seat can rotate relative to the base 1.

[0059] As Figure 3 and Figure 4 As shown in the figure, the mounting block 3 of this embodiment is specifically provided on the fixing block 103 through a rotating shaft 11. At this time, to facilitate the installation of the mounting block 3, as Figure 4 As shown in the figure, the fixing block 103 has a protruding mounting ear upward, and a mounting hole is provided on the mounting ear. The rotating shaft 11 of the mounting block 3 is inserted into the mounting hole. In addition, as a preferred embodiment, the connection method between the mounting shaft and the mounting block 3 is the same as the setting method of the connecting shaft 12. Refer to the following text for details and will not be elaborated here. In addition, to improve the overall structural strength of the base 1, as Figure 5 As shown in the figure, a reinforcing rib is connected between the column 102 and the fixing plate at the upper end.

[0060] It should be noted that the structure of the base 1 is not limited to that shown in the figure, as long as it can install the cylinder 2 and the above-mentioned mounting block 3, and can be connected to an external carrier. In addition, the connection between the rotating shaft 11 and the mounting block 3 can also adopt other conventional structures in addition to being the same as the following connecting shaft 12, as long as the rotating connection between the mounting block 3 and the fixing block 103 can be realized.

[0061] In addition, as a preferred implementation manner, in addition, the mounting block 3 is provided with connecting ears on both sides of the rod end spherical bearing 20. The connecting shaft 12 is inserted through the connecting ears, and clamping grooves 1201 are respectively provided at both ends of the connecting shaft 12. At the same time, a limiting piece 13 is provided on the connecting ear, and part of the limiting piece 13 is clamped in the clamping groove 1201 to limit the connecting shaft 12 from disengaging from the connecting ear. Among them, the rod end spherical bearing 20 can directly adopt the existing structure, and its overall structure refers to Figure 12 As shown in the figure. In this embodiment, by providing the clamping grooves 1201 at both ends of the connecting shaft 12 and providing the limiting piece 13 partially clamped in the clamping groove 1201 on the connecting ear, the connecting shaft 12 can be prevented from disengaging from the connecting ear. At the same time, this structure also facilitates the connection between the mounting block 3 and the rod end spherical bearing 20 and is convenient for visual inspection.

[0062] Specifically, the structure of the mounting block 3 in this embodiment is as shown in Figures 6 to 8 . It includes a mounting main body 301, a connecting arm 302 provided at the top of the mounting main body 301 and extending to one side thereof, and a limiting arm 303 provided below the connecting arm 302. Among them, the mounting main body 301 is rotatably connected to the fixed block 103 through a rotating shaft 11, and the pressing knife 4 is specifically provided on the mounting main body 301. And the limiting piece 13 is specifically provided on the connecting ear of the connecting arm 302, and as shown in Figure 2 and Figure 10 , it is integrally rectangular, and the card slot 1201 corresponds to the limiting piece 13 and is provided at the bottom of the connecting shaft 12. Of course, the shape of the limiting piece 13 is not limited to the rectangle shown in the figure. In addition, for the convenience of maintenance and replacement, as a preferred embodiment, the limiting piece 13 in this embodiment is detachably provided on the connecting ear, and the limiting piece 13 in this embodiment is specifically screwed on the connecting ear.

[0063] In addition, in this embodiment, for the convenience of setting the mounting main body 301, as shown in Figure 7 and Figure 9 , a notch is formed at one end of the top of the mounting main body 301 opposite to the connecting arm 302, and the pressing knife 4 is specifically provided in this notch. Among them, as a preferred embodiment, the structure of the pressing knife 4 in this embodiment is as shown in Figure 10 and Figure 11 . It includes a knife block 401 having a knife body part, and extension plates 402 provided on two opposite sides of the knife block 401, and the extension plates 402 on both sides extend in a direction away from the knife body part.

[0064] In addition, considering the influence of the machining accuracy of the knife, as a preferred embodiment, as shown in Figure 9 and Figure 11 , a vertically arranged first mounting hole is provided on the mounting block 3, and a first adjusting hole 4011 is provided on the pressing knife 4. The aperture of the first adjusting hole 4011 is different from that of the first mounting hole. The pressing knife 4 of the embodiment is provided on the mounting block 3 through a first connecting piece penetrating through the first adjusting hole 4011 and the first mounting hole. Thus, the pressing knife 4 can be moved in the horizontal direction or the left-right direction as shown in the Figure 8 state, and the alignment position of the first adjusting hole 4011 and the first mounting hole can be changed. After the two are connected, the position of the pressing knife 4 can be adjusted, and this structure is simple and convenient for adjustment.

[0065] As a preferred embodiment, the aperture diameter of the first adjustment hole 4011 in this embodiment is larger than that of the first mounting hole, so as to facilitate observing the relative position between the pressing tool 4 and the mounting block 3. Among them, the first adjustment hole 4011 is specifically provided on the tool block 401 of the pressing tool 4, and in order to maintain the stability after position adjustment, the first adjustment holes 4011 are specifically two arranged at intervals. Of course, during specific implementation, the quantity can be adjusted accordingly. In addition, in order to facilitate the connection and adjustment of the position of the pressing tool 4, as a preferred embodiment, the first mounting hole is specifically a threaded hole provided on the mounting body 301. Correspondingly, the first connecting member is a bolt.

[0066] It should be noted that in addition to making the aperture diameter of the first adjustment hole 4011 larger than that of the first mounting hole, it is also possible to make the aperture diameter of the first adjustment hole 4011 smaller than that of the first mounting hole.

[0067] As a further implementation manner, continue to refer to Figure 9 and Figure 11 as shown in, in this embodiment, a horizontally arranged second mounting hole is provided on the mounting block 3, and a second adjustment hole 4022 is provided on the pressing tool 4. The aperture diameter of the second adjustment hole 4022 is larger than that of the second mounting hole. And, the pressing tool 4 is provided on the mounting block 3 through a second connecting member passing through the second adjustment hole 4022 and the second mounting hole.

[0068] With such a setting, thus, the pressing tool 4 can be moved in the vertical direction, and the alignment position of the second adjustment hole 4022 and the second mounting hole can be changed. After the two are connected, the position of the pressing tool 4 in the vertical direction or Figure 8 the left - right direction as shown in the state can be adjusted, and this structure is simple and convenient for adjustment. Among them, as a preferred embodiment, the aperture diameter of the second adjustment hole 4022 in this embodiment is larger than that of the second mounting hole, so as to facilitate observing the relative position between the pressing tool 4 and the mounting block 3.

[0069] In addition, the second adjustment hole 4022 is specifically provided on the extension plate 402 of the pressing tool 4, and in order to maintain the stability after position adjustment, the second adjustment holes 4022 are specifically two arranged at intervals up and down. Of course, during specific implementation, the quantity can be adjusted accordingly. In addition, in order to facilitate the connection and adjustment of the position of the pressing tool 4, as a preferred embodiment, the second mounting hole is specifically a threaded hole provided on the mounting body 301. Correspondingly, the second connecting member is a bolt. It should be noted that in addition to making the aperture diameter of the second adjustment hole 4022 larger than that of the second mounting hole, it is also possible to make the aperture diameter of the second adjustment hole 4022 smaller than that of the second mounting hole. In addition, in order to better maintain the stability of the pressing tool 4 after adjusting the position, as Figure 9As shown in the figure, a first gasket 17, a second gasket 18, and a third gasket 19 are clamped between the pressing blade 4 and the mounting block 3. Thus, after adjusting the position of the pressing blade 4, by adjusting the number of each gasket, the pressing blade 4 can be kept in contact with the mounting block 3 in the horizontal, vertical, and left - right directions, thereby ensuring the stability of the pressing blade 4 and being beneficial to ensuring the edge - wrapping quality. In addition, as Figure 12 shown in the figure, as a preferred embodiment, the chamfer angle α of the blade body part of the pressing blade 4 is set between 43° and 47°, and preferably set to 45°, so as to effectively avoid the problem of poor edge - wrapping caused by the change of the force on the workpiece due to the change of the trajectory of the pressing blade 4.

[0070] In addition, in order to further improve the edge - wrapping quality of the workpiece, as a further implementation manner, a first limiting part and a second limiting part are provided between the base 1 and the mounting block 3. Among them, the first limiting part is used to limit the rotation angle of the mounting block 3 when the pressing blade 4 presses the edge of the workpiece. And a second limiting part is provided between the base 1 and the mounting block 3, and the second limiting part is used to limit the rotation angle of the mounting block 3 when the pressing blade 4 returns to its original position. The setting of the first limiting part and the second limiting part can prevent the pressing blade 4 from over - pressing the workpiece and reduce the edge - wrapping quality of the workpiece.

[0071] And, as a preferred embodiment, the first limiting part of this embodiment includes a first limiting block 5 provided on the base 1 and a first mating block 6 provided on the mounting block 3. Moreover, at least one of the first limiting block 5 and the first mating block 6 is provided with a first arc - shaped limiting surface and they are in contact with each other through the first arc - shaped limiting surface. Among them, combining Figure 4 and Figure 7 shown in the figure, a bracket 16 connected to the mounting plate 101 is provided on the base 1, and the bracket 16 is specifically in a "Z" shape, and the first limiting block 5 is specifically provided on the bracket 16.

[0072] In addition, the bottom surface of the first limiting block 5 is provided with a first arc - shaped limiting surface and is in contact with the first mating block 6 through the first arc - shaped limiting surface. The setting of the first arc - shaped limiting surface can, while realizing the limitation of the mounting block 3, effectively reduce the contact area between the two and prevent interference with the mounting block 3. And as Figure 7 shown in the figure, the first mating block 6 of this embodiment is specifically provided on the above - mentioned limiting arm 303. In addition, in order to be able to adjust the limit rotation angle of the mounting block 3, as Figure 7 and Figure 8 shown in the figure, the first mating block 6 is screwed on the limiting arm 303, and a fourth gasket 14 is clamped between the two, so that the limit rotation angle of the mounting block 3 can be adjusted by changing the number or thickness of the fourth gasket 14.

[0073] In addition, it should be noted that, in addition to setting the first arc-shaped limiting surface on the first limiting block 5, the first arc-shaped limiting surface can also be set on the first fitting block 6, or the first arc-shaped limiting surface can be set on both the first limiting block 5 and the first fitting block 6.

[0074] Similar to the first limiting portion, the second limiting portion of this embodiment includes a second limiting block 7 provided on the base 1 and a second fitting block 8 provided on the mounting block 3. Moreover, at least one of the second limiting block 7 and the second fitting block 8 is provided with a second arc-shaped limiting surface, and they are in abutment with each other through the second arc-shaped limiting surface. Among them, when the second limiting block 7 and the second fitting block 8 are in abutment through the second arc-shaped limiting surface, the contact area between the two can also be effectively reduced, and the interference with the mounting block 3 can be prevented.

[0075] Combined Figure 1 、 Figure 4 and Figure 8 As shown in, as a specific embodiment, the second limiting block 7 of this embodiment is specifically provided on the fixing block 103 of the base 1, and the second fitting block 8 is also provided on the limiting arm 303 of the mounting block 3. Moreover, the second fitting block 8 is provided with a second arc-shaped limiting surface and is in abutment with the second limiting block 7 through the second arc-shaped limiting surface. In addition, the same as above, in order to be able to adjust the limit rotation angle of the mounting block 3, as Figure 4 and Figure 5 shown in, the second limiting block 7 is screwed on the limiting arm 303, and a fifth gasket 15 is clamped between the two, so that the limit rotation angle of the mounting block 3 can be adjusted by changing the number or thickness of the fifth gasket 15.

[0076] In addition, it should be noted that, in addition to setting the second arc-shaped limiting surface on the second fitting block 8, the second arc-shaped limiting surface can also be set on the first limiting block 5, or the second arc-shaped limiting surface can be set on both the second limiting block 7 and the second fitting block 8.

[0077] In addition, as a further implementation manner, the base 1 is provided with a first sensing portion and a second sensing portion arranged at intervals, and the mounting block 3 is provided with a detection piece 9 with a notch. Moreover, the first sensing portion is used to sense the detection piece 9 when the pressing knife 4 is in the initial position of pushing, and the second sensing portion is used to sense the detection piece 9 when the pressing knife 4 presses the edge of the workpiece, and when the second sensing portion senses the detection piece 9, the notch is aligned with the first sensing portion.

[0078] Among them, as a specific embodiment, as Figure 4 and Figure 6As shown in the figure, the detection piece 9 is specifically arranged on the installation main body 301 of the installation block 3 and is generally in an "L" shape. Corresponding to the detection piece 9, an L-shaped support plate 10 is arranged on the installation plate 101. The first induction part and the second induction part can specifically adopt proximity switches (not shown in the figure) arranged on the support plate 10. Their technology is mature, widely used, and easy to obtain. Additionally, as a further implementation manner, the support plate 10 is provided with long slots and is bolted to the installation plate 101 through bolts passing through these long slots. Thus, the installation position of the support plate 10 can be adjusted to improve the detection accuracy.

[0079] Based on the above overall description, the part hemming mechanism of this embodiment can effectively eliminate the problem of large side wear resistance and hemming pressing force loss caused by non-coaxiality in the existing multi-link mechanism. Moreover, by using the lever structure of the single rotating shaft 11 mentioned above, it is beneficial to realize the amplification function of the hemming pressure, ensure that the hemming force meets the requirements, and ensure that the hemming is in place. At the same time, the structure of the pressing knife 4 can also ensure that the pre-flipping process of hemming is not interfered by the trajectory, thus improving the hemming quality of the part.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A workpiece hemming mechanism, characterized in that: It comprises a base (1), and a driving part and a mounting block (3) arranged on the base (1); The mounting block (3) is rotatably connected to the base (1) and is hingedly connected to the driving end of the driving unit. A pressing knife (4) is provided on the mounting block (3). Under the drive of the driving unit, the mounting block (3) can drive the pressing knife (4) to flip relative to the base (1) so as to push the hemming of the workpiece to a preset angle.

2. The workpiece hemming mechanism according to claim 1, characterized in that: A first limiting portion and a second limiting portion are provided between the base (1) and the mounting block (3); The first limiting portion is used to limit the rotation angle of the mounting block (3) when the pressing knife (4) pushes the hemming of the workpiece; The second limiting portion is used to limit the rotation angle of the mounting block (3) when the pressing knife (4) returns to its original position.

3. The workpiece hemming mechanism according to claim 2, characterized in that: The first limiting portion comprises a first limiting block (5) provided on the base (1), and a first matching block (6) provided on the mounting block (3); A first arc-shaped limiting surface is provided on at least one of the first limiting block (5) and the first matching block (6).

4. The workpiece hemming mechanism according to claim 2, characterized in that: The second limiting portion comprises a second limiting block (7) provided on the base (1), and a second matching block (8) provided on the mounting block (3); A second arc-shaped limiting surface is provided on at least one of the second limiting block (7) and the second matching block (8).

5. The workpiece hemming mechanism according to claim 1, characterized in that: The arrangement position of the pressing knife (4) on the mounting block (3) is adjustable.

6. The workpiece hemming mechanism according to claim 5, characterized in that: The mounting block (3) is provided with a first mounting hole arranged vertically, and the pressing knife (4) is provided with a first adjustment hole (4011), and the first adjustment hole (4011) has a different aperture from that of the first mounting hole; The pressing knife (4) is arranged on the mounting block (3) via a first connecting piece which is inserted through the first adjusting hole (4011) and the first mounting hole.

7. The workpiece hemming mechanism according to claim 6, characterized in that: The mounting block (3) is provided with a second mounting hole arranged horizontally, the pressing knife (4) is provided with a second adjustment hole (4022), and the second adjustment hole (4022) has a different aperture from the second mounting hole; The pressing knife (4) is arranged on the mounting block (3) via a second connecting piece which is inserted through the second adjusting hole (4022) and the second mounting hole.

8. The workpiece hemming mechanism according to claim 1, characterized in that: The driving unit comprises a cylinder (2) rotatably arranged on the base (1), and a rod end joint bearing (20) is arranged on the driving end of the driving unit, and the mounting block (3) is connected to the rod end joint bearing (20) via a connecting shaft (12).

9. The workpiece hemming mechanism according to claim 8, characterized in that: The mounting block (3) is provided with connecting ears on both sides of the rod end joint bearing (20), the connecting shaft (12) is passed through the connecting ears, and clamping grooves (1201) are respectively arranged at both ends of the connecting shaft (12); The connecting ears are provided with limiting pieces (13), and part of the limiting pieces (13) are clamped in the clamping grooves (1201) to prevent the connecting shaft (12) from disengaging from the connecting ears.

10. The workpiece hemming mechanism according to any one of claims 1 to 9, characterized in that: The base (1) is provided with a first sensing part and a second sensing part arranged at intervals, and the mounting block (3) is provided with a detection piece (9) with a notch; The first sensing part is used to sense the detection piece (9) when the pressing knife (4) is in the initial position of pushing, the second sensing part is used to sense the detection piece (9) when the pressing knife (4) presses the hem of the workpiece, and when the second sensing part senses the detection piece (9), the notch is aligned with the first sensing part.

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