Hydraulic multi-angle precise bending construction device

Abstract

The present application relates to the technical field of bending processing equipment, and specifically provides a hydraulic multi-angle precise bending construction device, which comprises a processing table, a bending roller and a sliding platform; a bending module is installed on the sliding platform and comprises a matching roller which is vertically rotatably installed on the sliding platform and cooperates with the bending roller, two reference frames and two positive push dies, the positive push dies on the same side of the bending roller are connected with the reference frames through elastic members; two locking mechanisms are correspondingly assembled on the two reference frames; a bending driving member is arranged on the sliding platform and connected with the two reference frames; and two reverse push mechanisms are correspondingly assembled on the two reference frames; the device provided by the present application can be used for bending processing of pipe workpieces which are prone to rebound, and the automatic rebound of the pipe workpieces is matched to actively release the elastic stress, and the reverse bending pressure is maintained to promote the shaping of the pipe workpieces, so that the influence of the bending rebound of the workpiece material is eliminated, and the bending angle precision of the pipe workpieces is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bending processing equipment, and specifically provides a hydraulic multi-angle precise bending construction device. BACKGROUND

[0002] Bending processing is a common processing method in part processing, and generally, a rod, a pipe or other materials are bent into one or more bending structures by corresponding bending equipment, so that the materials meet the use requirements in corresponding occasions.

[0003] In existing processing, most workpieces are generally formed by one-time bending, but when the elastic modulus or yield strength of the workpiece material is high, or the workpiece material is a thin-walled structure, after one-time bending processing in existing processing, the workpiece mostly has a relatively obvious springback phenomenon, so that the final bending angle of the workpiece has a large error with the required bending angle, and thus cannot meet the use requirements of workpieces with high precision requirements. SUMMARY

[0004] In order to solve the above problems, the present application provides a hydraulic multi-angle precise bending construction device for solving the problems mentioned in the background.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a hydraulic multi-angle precise bending construction device, comprising: a processing table provided with a bending roller rotating around a vertical shaft and a sliding platform slidingly installed in a horizontal direction; a bending module installed on the sliding platform, comprising a cooperating roller vertically and rotatably installed on the sliding platform and cooperating with the bending roller, two reference frames coaxially and rotatably installed with the cooperating roller and symmetrically arranged relative to the bending roller, and two positive pushing dies, the positive pushing dies located on the same side of the bending roller being connected with the reference frames through elastic members; the included angle of the two positive pushing dies is less than or equal to the included angle of the two reference frames; two locking mechanisms are correspondingly assembled on the two reference frames, and are used to lock the positive pushing dies after adjusting the angle of the positive pushing dies relative to the reference frames; a bending driving member is provided on the sliding platform and connected with the two reference frames, and is used to drive the two reference frames and over-bend the workpiece through the two positive pushing dies; and two reverse pushing mechanisms are correspondingly assembled on the two reference frames; the reverse pushing mechanism reversely bends the workpiece after over-bending, and releases the locking of the positive pushing die before contacting the workpiece, the positive pushing die is reset by the elastic force and adheres to the reference frame, the included angle of the two positive pushing dies is equal to the included angle of the two reference frames, and the reverse pushing mechanism continues to act to reversely bend the workpiece to adhere to the two positive pushing dies.

[0006] Preferably, the reference frame comprises a material supporting plate and a stop plate; the material supporting plate is used to support the workpiece and is coaxially installed with the matching roller; the stop plate is L-shaped, and the vertical plate part of the stop plate is fixedly connected along the long side of the upper end surface of the material supporting plate, and the bottom of the positive push die on the same side of the bending roller is in contact with the upper end surface of the material supporting plate, and the positive push die is connected with the stop plate through an elastic element; when the included angle of the two positive push dies is equal to the included angle of the two reference frames, the positive push die is in close contact with the vertical plate part of the stop plate.

[0007] Preferably, an arc hole with a center on the center axis of the matching roller is formed on the material supporting plate; the bottom end of the positive push die is fixed with a locking pin moving along the arc hole, the bottom end of the locking pin is fixed with an arc sleeve coinciding with the center of the arc hole, and the locking pin is provided with a plug-in hole from the bottom end along the shaft; the locking mechanism comprises a locking component capable of being inserted into the plug-in hole and moving the locking pin along the arc hole; when the reverse pushing mechanism reversely bends the workpiece, the locking component is extracted from the plug-in hole, and the locking component can slide along the arc line of the arc sleeve.

[0008] Preferably, the locking mechanism further comprises a No. 1 air cylinder horizontally hinged at the bottom end of the material supporting plate, and the output end of the No. 1 air cylinder is vertically slidably installed with a slide rod, and the locking component is fixed at the top end of the slide rod, and a return spring is connected between the locking component and the output end of the No. 1 air cylinder.

[0009] Preferably, the locking component comprises a base plate fixed at the top end of the slide rod, and one end of the return spring is fixed on the base plate; the upper end surface of the base plate is fixed with a plug pin capable of being vertically inserted into the plug-in hole; the reverse pushing mechanism comprises a reverse push die slidably installed on the upper end surface of the material supporting plate in a direction perpendicular to the plate surface of the vertical plate part of the stop plate, the positive push die is located between the stop plate and the reverse push die on the same side of the bending roller, and the reverse push die and the positive push die are both provided with a type groove on the opposite surface and in close contact with the workpiece; the reverse push die is fixed with a ball seat on the side opposite to the type groove, and the bottom end of the ball seat is movably embedded with a ball; the upper end surface of the base plate is fixed with an arc wedge block matched with the ball; when the reverse push die approaches the stop plate, the ball is in contact with the wedge surface of the arc wedge block, the locking component is lowered, and the plug pin is extracted from the plug-in hole.

[0010] Preferably, the bending driving element comprises a stroke hinge base, at least one guide rod is fixed on the stroke hinge base and horizontally slidably installed on the sliding platform, two connecting rods are hinged on the stroke hinge base, and the other ends of the two connecting rods are correspondingly hinged at the bottom ends of the two material supporting plates.

[0011] Preferably, the type grooves of the positive push die and the reverse push die are both tangentially arranged with the upper end surface of the material supporting plate; the center axis of the type groove of the reverse push die is parallel to the plate surface of the vertical plate part of the stop plate.

[0012] Preferably, a plurality of tension springs are hinged between the top end of the positive push die and the top end of the stop plate.

[0013] Preferably, the sliding rod is in keying fit sliding installation with the output end of the first cylinder.

[0014] The technical scheme has the following advantages or beneficial effects: the hydraulic multi-angle precise bending construction device can be used for bending processing of pipe workpieces prone to springback, is provided with a bending module, the combination module structure of the bending module adopts a reference frame as a reference and an overbending positive push die, a locking mechanism for automatically adjusting the overbending angle and realizing angle locking is installed in cooperation between the reference frame and the positive push die, and a reverse push mechanism for reverse bending is installed in cooperation with the locking mechanism, the overbending can be performed in advance in actual processing, and further reverse bending correction can be realized, and in the process of reverse bending performed by the reverse push mechanism, the locking of the positive push die can be released by the locking mechanism before formal reverse bending, so as to realize automatic separation of the positive push die from the pipe workpiece and self-resetting, to actively release the elastic stress by cooperating with the automatic springback of the pipe workpiece, and to promote the final bending plastic deformation of the pipe workpiece by reverse bending to ensure the bending angle accuracy of the pipe workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application and its features, shapes and advantages will become more apparent upon reading the following detailed description of non-limiting embodiments with reference to the attached drawings. The same reference numbers in all the drawings indicate the same parts and the drawings are not necessarily drawn to scale, the emphasis being on illustrating the principle of the application.

[0016] Figure 1 is a perspective view of a hydraulic multi-angle precise bending construction device provided by the present application.

[0017] Figure 2 is a top view of a hydraulic multi-angle precise bending construction device provided by the present application.

[0018] Figure 3 is a bottom view of a hydraulic multi-angle precise bending construction device provided by the present application (excluding other structures in the processing table except the sliding platform).

[0019] Figure 4 is a perspective view of two locking mechanisms and two reverse push mechanisms assembled on the bending module.

[0020] Figure 5 is a perspective view of a reference frame.

[0021] Figure 6 is a perspective view of a positive push die.

[0022] Figure 7 is a perspective view of a locking mechanism.

[0023] Figure 8is a perspective view of the reverse push die.

[0024] Figure 9 is a structural schematic view of the bending die set, locking mechanism and reverse push mechanism.

[0025] Figure 10 is a perspective view of the bent pipe workpiece.

[0026] In the figure: 1, processing table; 11, guide rail; 12, round roller table; 13, bending roller; 14, sliding platform; 2, bending die set; 21, matching roller; 22, reference frame; 221, material supporting plate; 222, stop plate; 223, circular arc hole; 23, positive push die; 231, locking pin; 232, circular arc sleeve; 233, plug-in hole; 24, tension spring; 3, locking mechanism; 31, cylinder seat; 32, No. 1 air cylinder; 33, sliding rod; 34, locking component; 341, base plate; 342, plug pin; 343, circular arc wedge; 35, return spring; 4, reverse push mechanism; 41, No. 2 air cylinder; 42, reverse push die; 43, ball seat; 431, ball; 5, bending driving part; 51, No. 3 air cylinder; 52, stroke hinge seat; 53, guide rod; 54, connecting rod. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] As shown in Figure 1 and Figure 2 , a hydraulic multi-angle precise bending construction device, in the present application, the device is mainly aimed at the pipe workpiece which is easy to rebound and deform for bending processing, the device comprises a processing table 1, two guide rails 11 are welded on the processing table 1, a sliding platform 14 is horizontally and slidingly fitted and installed between the two guide rails 11, in the embodiment, the sliding platform 14 can be pushed by a cylinder, the cylinder used is not shown in the drawing; a round roller table 12 is centrally welded on the processing table 1 between the two guide rails 11, a bending roller 13 is vertically and rotatably installed on the round roller table 12 through a bearing, the bending roller 13 is a forming die for pipe bending.

[0030] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4As shown in the drawings, the bending module 2 is assembled on the sliding platform 14, the bending module 2 comprises a matching roller 21 which is vertically rotatably installed on the sliding platform 14 and cooperates with the bending roller 13, two reference frames 22 which are coaxially rotatably installed with the matching roller 21 and are symmetrically arranged relative to the bending roller 13, and two positive pushing dies 23, the matching roller 21 and the bending roller 13 are centrally arranged relative to the two guide rails 11, the matching roller 21 can serve as a bending fulcrum of the outer bending part of the bent pipe, the forming guide grooves of the matching roller 21 and the bending roller 13 are the same, and correspond to the size of the bent pipe to be processed; the reference frame 22 comprises a material supporting plate 221 and a stop plate 222 which are integrally processed; the material supporting plate 221 is used for supporting the pipe and is coaxially rotatably installed with the matching roller 21; the stop plate 222 is L-shaped, and the vertical plate part of the stop plate 222 is fixedly connected along the long edge of the upper end surface of the material supporting plate 221, the bottom of the positive pushing die 23 on the same side of the bending roller 13 is in contact with the upper end surface of the material supporting plate 221, a type groove with a central axis along the length direction is formed in the positive pushing die 23, the type groove is a local circular hole groove structure, and is matched with the size of the pipe, in order to facilitate the pipe on the material supporting plate 221 in the initial state to enter the type groove, the circle where the type groove is located is tangent to the upper end surface of the material supporting plate 221; a plurality of tension springs 24 are hingedly connected between the top end of the positive pushing die 23 and the top end of the stop plate 222, and the plurality of tension springs 24 are evenly distributed along the length direction of the stop plate 222. In the present application, the two reference frames 22 are actual bending references, that is, the included angle between the vertical plate parts of the two stop plates 222 is the standard angle after the pipe is bent and formed, and the two positive pushing dies 23 serve as driving members for driving the pipe to be positively bent, the included angle of the two positive pushing dies 23 is less than or equal to the included angle of the two reference frames 22; only when the positive pushing die 23 abuts against the vertical plate part of the stop plate 222, the central axis of the type groove of the positive pushing die 23 is parallel to the plate surface of the vertical plate part of the stop plate 222, at this time, the included angle of the two positive pushing dies 23 is equal to the included angle of the two reference frames 22.

[0031] As shown in the drawings, Figure 1 , Figure 3 and Figure 4 , in order to cope with the springback deformation of the pipe after bending, the pipe can be pre-bent excessively by the two positive pushing dies 23, the excessive bending angle can be determined according to the actual springback degree caused by the material and structural characteristics of the pipe, in order to facilitate the adjustment of the angle between the positive pushing die 23 and the reference frame 22 and the angle position locking, therefore, the bottom end of the material supporting plate 221 of the two reference frames 22 is correspondingly assembled with a locking mechanism 3.

[0032] As shown in the drawings, Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9As shown, the material supporting plate 221 is provided with an arc hole 223 with its center located on the center axis of the matching roller 21; the bottom end of the positive push mold 23 is welded with a locking pin 231 moving along the arc hole 223, the bottom end of the locking pin 231 is welded with an arc sleeve 232 coinciding with the center of the arc hole 223, the locking pin 231 is provided with a plug-in hole 233 from the bottom end along the shaft; the locking mechanism 3 includes a cylinder seat 31 fixed on the bottom end of the material supporting plate 221 by screws, the bottom end of the cylinder seat 31 is horizontally hinged with a No. 1 cylinder 32, the output end of the No. 1 cylinder 32 is vertically slidingly installed with a slide rod 33 in a key fit, the top end of the slide rod 33 is fixed with a locking part 34; the locking part 34 includes a base plate 341 welded on the top end of the slide rod 33, the upper end face of the base plate 341 is welded with a plug pin 342 vertically inserted into the plug-in hole 233; the slide rod 33 is sleeved with a return spring 35, the both ends of the return spring 35 are welded on the base plate 341 and the output end of the No. 1 cylinder 32 respectively. When the plug pin 342 is inserted into the plug-in hole 233, the No. 1 cylinder 32 is extended and retracted, the output end of the No. 1 cylinder 32 drives the slide rod 33 together with the locking part 34 to move, the locking part 34 drives the locking pin 231 to move along the arc hole 223 through the plug pin 342, so that the angle of the positive push mold 23 relative to the reference frame 22 can be adjusted, the position of the positive push mold 23 is locked after the output end of the No. 1 cylinder 32 is locked (the cylinder locking is prior art), when the plug pin 342 is pulled out of the plug-in hole 233, the plug pin 342 can move along the arc sleeve 232, in the non-locking state.

[0033] As Figure 1 , Figure 2 , Figure 4 , Figure 8 and Figure 9As shown, the material supporting plate 221 of the two reference frames 22 is correspondingly equipped with a reverse pushing mechanism 4; the reverse pushing mechanism 4 comprises a No. 2 air cylinder 41 horizontally fixedly installed through an air cylinder fixing frame welded on the material supporting plate 221, the output direction of the No. 2 air cylinder 41 is vertically arranged relative to the plate face of the vertical plate part of the stop plate 222, the output end of the No. 2 air cylinder 41 is fixedly provided with a reverse pushing die 42 through bolts, the positive pushing die 23 is located between the stop plate 222 and the reverse pushing die 42 on the same side of the bending roller 13, the reverse pushing die 42 is provided with a profile groove extending to both ends along the length direction, the profile groove of the reverse pushing die 42 has the same structure size as the profile groove of the positive pushing die 23 and is located on the opposite face respectively, the bottom end of the reverse pushing die 42 is attached to the material supporting plate 221, the circle where the profile groove of the reverse pushing die 42 is located is also tangent to the upper end face of the material supporting plate 221, and the reverse pushing die 42 is slidingly installed on the material supporting plate 221. A ball seat 43 is welded on the side of the reverse pushing die 42 away from the profile groove, and the bottom end of the ball seat 43 is movably embedded with a ball 431; the upper end face of the base plate 341 is welded with a circular arc wedge block 343 matched with the ball 431; when the reverse pushing die 42 approaches the stop plate 222, the ball 431 contacts the wedge face of the circular arc wedge block 343, the locking part 34 descends, and the bolt 342 is pulled out of the insertion hole 233.

[0034] As shown in Figure 1 , Figure 2 and Figure 3 , the sliding platform 14 is equipped with a bending driving part 5 for driving the two reference frames 22 and bending the workpiece through the two positive pushing dies 23; the bending driving part 5 comprises a No. 3 air cylinder 51 horizontally fixedly installed on the sliding platform 14 through bolts, the output direction of the No. 3 air cylinder 51 is along the direction of the guide rail 11, the output end of the No. 3 air cylinder 51 is welded with a stroke hinge base 52, the stroke hinge base 52 is fixedly provided with two guide rods 53 slidingly installed on the sliding platform 14 through bolts, the stroke hinge base 52 is hingedly connected with two connecting rods 54, and the other ends of the two connecting rods 54 are correspondingly hingedly connected with the bottom ends of the two material supporting plates 221.

[0035] The present application provides a hydraulic multi-angle precise bending construction device for bending a straight pipe into a bent pipe structure as shown in Figure 10 , wherein the straight pipe is cut into equal lengths according to a standard length by default, in the initial state of the device, the cooperation roller 21 is located away from the bending roller 13, the sliding platform 14 is located farthest from the circular roller table 12, and the relative angle of the two reference frames 22 is 180°; during the bending process, the specific bending process can be seen as follows: first, the straight pipe is placed on the two material supporting plates 221, in order to ensure that the bending part is basically located at the central position of the pipe, a reference line can be marked on one of the material supporting plates 221, and when the straight pipe is placed, the one end of the straight pipe is aligned with the reference line.

[0036] Subsequently, the sliding platform 14 moves towards the direction close to the bending roller 13, and drives the pipe, so that the middle part of the pipe is clamped between the bending roller 13 and the matching roller 21. Then, the third cylinder 51 is started, the stroke hinge base 52 moves away from the circular roller table 12, and the two reference frames 22 are indirectly pushed by the two positive pushing dies 23 to realize bending of the pipe when the angle of the two reference frames 22 reaches the angle equal to the standard bending angle of the pipe. The output end of the third cylinder 51 stops extending, and the two positive pushing dies 23 overbend the pipe, that is, the bending angle of the pipe is smaller than the standard angle.

[0037] Subsequently, the two reverse pushing mechanisms 4 are started synchronously, the second cylinder 41 drives the reverse pushing die 42 to slide towards the stop plate 222, the ball seat 43 moves to the lower side of the material supporting plate 221, the ball 431 contacts the wedge surface of the circular wedge block 343, the locking component 34 is lowered as a whole, the pin 342 is pulled out of the insertion hole 233 before the reverse pushing die 42 contacts the pipe, the locking of the positive pushing die 23 is released, the position of the pin 342 in the horizontal range is fixed, but under the common pulling force of the plurality of pulling springs 24, the positive pushing die 23 is pulled to reset to the position abutting against the stop plate 222, the pin 342 slides relatively in the smooth sleeve, at this time, the positive pushing die 23 is reset and automatically separated from the pipe, and the pipe has a rebounding tendency after being bent, the positive pushing die 23 is reset and actively removed, in the process of resetting the positive pushing die 23 before the reverse pushing die 42 contacts the pipe, the pipe can automatically rebound and actively release the elastic stress, with the continuous movement of the reverse pushing die 42, the reverse pushing die 42 contacts the pipe and assists in pushing the pipe to be reversely bent, until the pipe is reversely bent to be clamped between the type grooves of the positive pushing die 23 and the reverse pushing die 42, and pressure is maintained for several seconds, so that the pipe can maintain the final plastic deformation state, in this process, the stress of the pipe is gradually released, and the pipe is reversely bent and corrected after overbending, so that the bending angle of the pipe is basically consistent with the required angle, and the influence of the rebounding phenomenon is reduced.

[0038] After the bending is completed, the reverse pushing die 42 and the sliding platform 14 are reset, and then the bent pipe can be taken out, in addition, after the first cylinder 32 is retracted and reset, the pin 342 automatically moves along the circular arc sleeve 232 and automatically pops into the insertion hole 233, then the positive pushing die 23 can be pushed to the corresponding angle position by the first cylinder 32 again, finally, when the two reference frames 22 are reset, the next round of bending processing can be carried out.

[0039] The application provides a hydraulic multi-angle precise bending construction device, which can be used for bending processing of pipe workpieces prone to rebound, is provided with a bending module 2, and adopts a combined module structure with a reference frame 22 as a reference and an overbending positive push die 23 in the bending module 2.

[0040] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The preferred embodiments of the present application have been described. It is to be understood that the application is not limited to the above specific embodiments, and that devices and structures not described in detail should be understood to be implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications, or modify equivalent embodiments without departing from the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A hydraulic multi-angle precision bending construction device, characterized in that, The utility model relates to a bending device for workpiece, comprising: a processing table provided with a bending roller rotating around a vertical shaft and a sliding platform sliding horizontally; a bending module installed on the sliding platform, comprising a matching roller installed vertically on the sliding platform and matched with the bending roller, two reference frames installed coaxially with the matching roller and symmetrically arranged relative to the bending roller, and two positive pushing molds connected with the reference frames through elastic members; the included angle of the two positive pushing molds is less than or equal to the included angle of the two reference frames; two locking mechanisms correspondingly installed on the two reference frames for locking the positive pushing molds after adjusting the angle of the positive pushing molds relative to the reference frames; a bending driving member installed on the sliding platform and connected with the two reference frames for driving the two reference frames and overbending the workpiece through the two positive pushing molds; and two reverse pushing mechanisms correspondingly installed on the two reference frames; the reverse pushing mechanism reversely bends the workpiece after overbending, releases the locking of the positive pushing mold before contacting the workpiece, the positive pushing mold is reset by elastic force and adheres to the reference frame, the included angle of the two positive pushing molds is equal to the included angle of the two reference frames, and the reverse pushing mechanism continues to work to reversely bend the workpiece to adhere to the two positive pushing molds. The reference frame comprises a material supporting plate and a stop plate; the material supporting plate is used for supporting the workpiece and is installed coaxially with the matching roller; the stop plate is L-shaped, the vertical plate part of the stop plate is fixedly connected along the long edge of the upper end surface of the material supporting plate, the bottom of the positive pushing mold on the same side of the bending roller contacts the upper end surface of the material supporting plate, and the positive pushing mold is connected with the stop plate through elastic members; when the included angle of the two positive pushing molds is equal to the included angle of the two reference frames, the positive pushing mold adheres to the vertical plate part of the stop plate. An arc hole with the center on the center axis of the matching roller is formed in the material supporting plate; the bottom end of the positive pushing mold is fixedly provided with a locking pin moving along the arc hole, the bottom end of the locking pin is fixedly provided with an arc sleeve coinciding with the center of the arc hole, and a plug-in hole is formed in the locking pin from the bottom end along the shaft; the locking mechanism comprises a locking part capable of being inserted into the plug-in hole and moving the locking pin along the arc hole; when the reverse pushing mechanism reversely bends the workpiece, the locking part is extracted from the plug-in hole, and the locking part can slide along the arc line of the arc sleeve.

2. The hydraulic multi-angle precision bending construction device according to claim 1, characterized in that: The locking mechanism further comprises a No. 1 air cylinder horizontally hinged at the bottom end of the material supporting plate, a sliding rod is vertically and slidingly installed at the output end of the No. 1 air cylinder, the locking part is fixed at the top end of the sliding rod, and a reset spring is connected between the locking part and the output end of the No. 1 air cylinder.

3. The hydraulic multi-angle precision bending construction device according to claim 2, characterized in that: The locking part comprises a base plate fixed at the top end of the sliding rod, and one end of the reset spring is fixed on the base plate; a plug pin capable of being vertically inserted into the plug-in hole is fixed on the upper end surface of the base plate; the reverse pushing mechanism comprises a reverse pushing mold slidingly installed on the upper end surface of the material supporting plate in the direction perpendicular to the plate surface of the vertical plate part of the stop plate, the positive pushing mold is located between the stop plate and the reverse pushing mold on the same side of the bending roller, and the reverse pushing mold and the positive pushing mold are both provided with a type groove adhering to the workpiece on the opposite surface; a ball seat is fixed on one side of the reverse pushing mold away from the type groove, and a ball is movably embedded at the bottom end of the ball seat; the upper end surface of the base plate is fixedly provided with an arc wedge block matched with the ball; when the reverse pushing mold approaches the stop plate, the ball contacts the wedge surface of the arc wedge block, the locking part is touched and lowered, and the plug pin is extracted from the plug-in hole.

4. The hydraulic multi-angle precision bending construction device according to claim 1, characterized in that: The bending driving member comprises a stroke hinge base, at least one guide rod horizontally slidingly installed on the sliding platform is fixed on the stroke hinge base, two connecting rods are hingedly connected on the stroke hinge base, and the other ends of the two connecting rods are hingedly connected on the bottom ends of the two material supporting plates.

5. The hydraulic multi-angle precision bending construction device according to claim 3, characterized in that: The type grooves of the positive pushing die and the reverse pushing die are both tangent to the upper end surfaces of the material supporting plates; and the central axis of the type groove of the reverse pushing die is parallel to the plate surface of the vertical plate part of the stop plate.

6. The hydraulic multi-angle precision bending construction device according to claim 1, characterized in that: A plurality of tension springs are hingedly connected between the top end of the positive pushing die and the top end of the stop plate.

7. The hydraulic multi-angle precision bending construction device according to claim 2, characterized in that: The sliding rod is slidingly installed in key cooperation with the output end of the No. 1 air cylinder.

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