An integrated bending and forming equipment and process for ring main units

Abstract

This invention discloses an integrated bending and forming equipment and process for ring main units, relating to the field of ring main unit cabinet production and processing. It includes a main body composed of an upper mold and a lower mold, a mold groove, a lifting seat, and a resetter. The top of the lifting seat protrudes from the mold groove. Multiple positioning blocks are slidably mounted on the lower mold, and compression springs are installed on the outer walls of the positioning blocks. A pre-pressure frame is slidably mounted on the top of the lifting seat, its top protruding from the top surface of the lifting seat. A lifting spring and a limiting post are connected to the bottom of the pre-pressure frame. The lower mold is equipped with a pushing mechanism, a bending mechanism, a lifting mechanism, and a cooling mechanism. This invention adopts a combined bending structure of a pre-bending plate, a resistance-reducing wheel, and a positioning wheel. First, the pre-bending plate guides the sheet metal through a rolling pre-bending process. Then, the positioning wheel and the resistance-reducing wheel cooperate to complete the final forming. The bending process involves rolling contact rather than hard extrusion, significantly reducing mold wear and bending resistance. Simultaneously, the bending angle is more precise, and the sheet surface is flatter, meeting the high-precision sheet metal forming requirements of ring main units.

Description

Technical Field

[0001] This invention relates to the field of ring main unit cabinet production and processing technology, specifically to an integrated bending and forming equipment and process for ring main units. Background Technology

[0002] In the field of ring main unit cabinet production and processing, bending and flanging of sheet metal parts such as electrical cabinet and electrical box doors are key processes to ensure the structural strength, sealing and assembly accuracy of the cabinet. In order to improve processing efficiency and forming consistency, the industry generally adopts integrated bending forming equipment to perform one-time stamping and bending of sheet metal parts, which can achieve multi-face simultaneous forming, effectively improving production efficiency and product qualification rate.

[0003] The existing integrated bending and forming equipment for ring main units mainly consists of an upper mold and a lower mold. The upper mold is equipped with a movable slider, forming pressure block and unloading mechanism. The lower mold includes a lower die, forming mold groove, lifting seat and lifting seat resetter. The surface of the lower die has a mold groove that matches the bending shape of the sheet metal part. The lifting seat works with the resetter to eject the material after bending. The equipment relies on positioning columns to limit and fix the four sides of the sheet metal part. By moving the upper mold downward and cooperating with the lower die mold groove, multiple bending and flanging operations of the sheet metal part can be completed at one time. It has the advantages of fast forming speed, stable bending angle and relatively smooth unloading, and is widely used in the sheet metal processing of ring main units.

[0004] However, in actual use, due to the thickness of the sheet metal parts, they need to be positioned against the positioning posts before bending. During the bending deformation process, the outer wall of the sheet metal is prone to continuous friction with the outer wall of the positioning posts, which can easily cause wear on the positioning posts and scratches on the edges of the sheet metal, affecting the service life of the mold and the appearance quality of the finished product. At the same time, the bending action mainly relies on the direct hard extrusion between the sheet metal and the opening of the lower mold groove. The wear rate of the mold contact parts is fast. Long-term use will lead to bending angle deviation and decreased mold accuracy, requiring frequent maintenance and replacement. This not only increases production costs but also makes it difficult to meet the needs of efficient, stable, and high-precision continuous processing of ring main unit sheet metal parts. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated bending and forming equipment and process for ring main units to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated bending and forming equipment for ring main units, comprising an equipment body consisting of an upper mold and a lower mold, a mold groove, a lifting seat, and a resetter. The top of the lifting seat protrudes from the mold groove. The lower mold is slidably provided with multiple positioning blocks, and compression springs are installed on the outer walls of the positioning blocks. A pre-pressure frame is slidably installed on the top of the lifting seat, with its top protruding from the top surface of the lifting seat. A lifting spring and a limiting post are connected to the bottom of the pre-pressure frame. The lower mold is provided with a pushing mechanism, a bending mechanism, a lifting mechanism, and a cooling mechanism. The pushing mechanism works in conjunction with the pre-pressure frame to push the positioning blocks to separate from the side wall of the plate and to push the translational piston in the cooling mechanism to perform air extraction. The lifting mechanism works in conjunction with the pre-pressure frame to drive the bending mechanism to operate. The bending mechanism includes a pre-bending plate and a positioning wheel rotatably mounted on the top of the lower die. The bottom of the pre-bending plate is connected to the lifting mechanism, and multiple resistance-reducing wheels are installed on the top surface of the pre-bending plate. The positioning wheels are located between the pre-bending plates, and the pre-bending plates are used to contact the workpiece so that the workpiece will be bent under the constraint of the pre-bending plate after it moves down with the lifting seat.

[0007] Preferably, the top of the lower mold is provided with a limiting groove for the sliding of the positioning block, and a limiting seat connected to the positioning block is installed in the limiting groove. The limiting seat consists of a connecting seat connected to the limiting groove and a telescopic rod installed on the outer wall of the connecting seat. The other end of the telescopic rod is connected to the outer wall of the positioning block, and the compression springs are all sleeved on the telescopic rod.

[0008] Preferably, the propulsion mechanism includes a swing frame rotatably installed in the lifting seat, with the top of the swing frame located at the bottom of the pre-compression frame and in contact with the bottom surface of the pre-compression frame, and a propulsion wheel located outside the lifting seat rotatably installed at the other end of the swing frame. A transmission frame in contact with the propulsion wheel is slidably installed on the inner wall of the lower mold, and the other side of the transmission frame is in contact with the outer wall of the positioning block. An inclined guide plate that cooperates with the propulsion wheel is installed on the outer wall of the transmission frame.

[0009] Preferably, the lifting seat is equipped with a torsion spring corresponding to the swing frame, and the swing frame is designed to be inclined, and the sum of the downward sliding lengths of the lifting seat and the preload frame is less than the length of the transmission frame.

[0010] Preferably, the lifting mechanism includes an oil storage cylinder installed in the mold groove and a pressing piston slidably installed at the bottom of the lifting seat and slidably connected to the oil storage cylinder. The pressing piston is used in conjunction with a limiting post. Multiple lifting cylinders rotatably installed inside the lower mold and rotatably connected to the bottom of the pre-folded plate are provided. The lifting cylinders are connected to the pressing piston through oil pipes.

[0011] Preferably, the pressing piston is located directly below the limiting post, and when the preload frame has not descended, the bottom of the limiting post does not contact the top of the pressing piston.

[0012] Preferably, the cooling mechanism includes a movable cavity formed within the lower mold, and a translation piston is slidably installed within the movable cavity. Multiple sliding rods, slidably connected to the lower mold, are installed at the ends of the translation piston. The ends of the sliding rods are connected to a propulsion frame in the propulsion mechanism, and both ends of the propulsion frame are connected to the side walls of the transmission frame. The lower mold has an air inlet groove communicating with the external environment and an air blowing groove communicating with the mold groove. Both the air inlet groove and the air blowing groove are connected to the movable cavity and located on one side of the translation piston. The lower mold also has one-way valves corresponding to the air inlet groove and the air blowing groove. Multiple sets of heat dissipation grooves are formed on the outer wall of the lifting seat.

[0013] Preferably, multiple one-way valves are provided in the lower mold. The one-way valve in the air inlet groove is used to ensure that gas can only enter the active cavity through the air inlet groove. The one-way valve corresponding to the air blowing groove is used to connect the air blowing groove and the active cavity and to ensure that gas can only be discharged outward through the air blowing groove. The air blowing groove has two openings, both of which are designed to be inclined upward. One opening is located outside the lifting seat, and the other opening is located at the bottom of the positioning wheel.

[0014] A ring main unit integrated bending and forming process includes the following steps: S1: Place the sheet metal to be fitted between the positioning blocks so that the bottom of the sheet metal is in contact with the top surface of the preload frame; S2: Next, start the upper mold to descend, so that the upper mold begins to press down on the plate, causing the plate to move the pre-pressing frame downward, which pushes the positioning block outward through the propulsion mechanism to avoid the plate; S3: As the pre-compression frame continues to move downward, the limiting column presses down the piston, causing the pre-bending plate to start rotating upward as the plate moves downward, causing the resistance-reducing roller to contact the plate. As the upper die continues to descend, the lifting seat begins to move downward, so that the pre-bending plate begins to squeeze the plate through the resistance-reducing roller, thus performing pre-bending. S4: When the propulsion mechanism is running, it will push the translation piston to move away from the lifting seat and start to draw the gas from the external environment into the active chamber. S5: As the upper die continues to descend, the plate comes into contact with the positioning wheel, and the plate is bent with the cooperation of the positioning wheel and the resistance-reducing wheel. The descent distance of the upper die is reduced throughout the operation. S6: After bending is completed, the upper die rises, and the lifting seat drives the bending mechanism to reset under the action of the resetter. At the same time, it pushes the formed part upward to separate it from the bending mechanism. The positioning block resets under the action of the compression spring, which drives the propulsion mechanism to start resetting, thereby pulling the translation piston to reset. This operation blows the gas in the active cavity to the bending mechanism and the outer wall of the lifting seat for cooling.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves automatic avoidance of the positioning block through the linkage of the pre-pressure frame and the propulsion mechanism. The positioning block is driven to slide outward before the plate begins to bend, which completely solves the problems of continuous friction between the plate and the positioning column, scratching of the plate edge, and wear of the mold in traditional bending equipment. It effectively protects the appearance integrity of the sheet metal parts and the service life of the mold, and greatly improves the quality of the finished ring main unit cabinet.

[0016] 2. This invention adopts a combined bending structure of pre-bending plate, drag-reducing wheel and positioning wheel. First, the pre-bending plate guides the plate to bend in a rolling manner. Then, the positioning wheel and drag-reducing wheel work together to complete the final forming. The bending process is rolling contact rather than hard extrusion, which significantly reduces mold wear and bending resistance. At the same time, the bending angle is more accurate and the plate surface is flatter, which meets the high-precision sheet metal forming requirements of ring main unit.

[0017] 3. This invention achieves synchronous linkage of bending action through lifting mechanism. It relies on the pre-pressure frame to trigger the hydraulic system to drive the pre-bending plate action. No additional motor, sensor and electronic control system are required. The pure mechanical linkage structure is more stable and has a lower failure rate. The action sequence is precise and consistent, ensuring uniform forming accuracy and high stability during continuous batch production.

[0018] 4. This invention significantly shortens the upper die's downward stroke through the protruding lifting seat and pre-bending structure, reducing the equipment's stamping load and energy consumption, and minimizing die impact wear. Simultaneously, the workpiece is automatically ejected by the reset device after forming, realizing full automation of the entire process of automatic positioning, automatic avoidance, pre-bending, one-piece forming, and automatic material unloading, without the need for manual assistance, and significantly improving the sheet metal processing efficiency of ring main units. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the lower mold in this invention; Figure 2 This is a schematic diagram of the structure of the lower mold after it has been cut open. Figure 3 This is a schematic diagram of the structure after the lower mold is removed in this invention; Figure 4 This is a schematic diagram of the propulsion mechanism and bending mechanism of the present invention; Figure 5 This is a schematic diagram of the lower mold and lifting seat after partial cross-section. Figure 6 For the present invention Figure 5 A magnified structural diagram of point A in the middle; Figure 7 This is a schematic diagram of the bending mechanism and lifting cylinder of the present invention; Figure 8 This is a schematic diagram of the cooling mechanism of the present invention.

[0020] In the diagram: 1. Lower mold; 2. Mold groove; 3. Lifting seat; 31. Resetter; 4. Positioning block; 5. Compression spring; 6. Limiting seat; 7. Pre-compression frame; 71. Lifting spring; 72. Limiting post; 8. Propulsion mechanism; 81. Swing frame; 82. Propulsion wheel; 83. Transmission frame; 84. Inclined guide plate; 85. Propulsion frame; 9. Bending mechanism; 91. Pre-bending plate; 92. Resistance reducing wheel; 93. Positioning wheel; 10. Lowering piston; 11. Oil reservoir; 12. Lifting oil cylinder; 13. Cooling mechanism; 131. Movable cavity; 132. Translation piston; 133. Sliding rod; 134. Air inlet groove; 135. Air blowing groove; 136. One-way valve; 137. Heat dissipation groove. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 The present invention provides the following technical solution: an integrated bending and forming device for a ring main unit. The device includes a main body composed of an upper mold and a lower mold 1, a mold groove 2, a lifting seat 3, and a resetter 31. The top of the lifting seat 3 protrudes from the mold groove 2. Multiple positioning blocks 4 are slidably mounted on the lower mold 1, and compression springs 5 ​​are installed on the outer walls of the positioning blocks 4. A pre-pressure frame 7 is slidably mounted on the top of the lifting seat 3, its top protruding from the top surface of the lifting seat 3. A lifting spring 71 and a limiting post 72 are connected to the bottom of the pre-pressure frame 7. The lower mold 1 is provided with a pushing mechanism 8, a bending mechanism 9, a lifting mechanism, and a cooling mechanism 13. 8 works in conjunction with the pre-pressure frame 7 to push the positioning block 4 to separate from the side wall of the plate and to push the translation piston 132 in the cooling mechanism 13 to perform air extraction. The lifting mechanism works in conjunction with the pre-pressure frame 7 to drive the bending mechanism 9 to run. The bending mechanism 9 includes a pre-bending plate 91 and a positioning wheel 93 rotatably mounted on the top of the lower die 1. The bottom of the pre-bending plate 91 is connected to the lifting mechanism, and multiple resistance-reducing wheels 92 are mounted on the top surface of the pre-bending plate 91. The positioning wheels 93 are located between the pre-bending plates 91, and the pre-bending plate 91 is used to contact the plate so that the plate will be bent under the restriction of the pre-bending plate 91 after it moves down with the lifting seat 3.

[0023] In one embodiment of the present invention, the top of the lower mold 1 is provided with a limiting groove for the sliding of the positioning block 4, and a limiting seat 6 connected to the positioning block 4 is installed in the limiting groove. The limiting seat 6 consists of a connecting seat connected to the limiting groove and a telescopic rod installed on the outer wall of the connecting seat. The other end of the telescopic rod is connected to the outer wall of the positioning block 4, and compression springs 5 ​​are all sleeved on the telescopic rod. The limiting seat 6 is used to guide and limit the positioning block 4 to ensure that the positioning block 4 slides smoothly without deviation.

[0024] In one embodiment of the present invention, the propulsion mechanism 8 includes a swing frame 81 rotatably mounted in the lifting seat 3, with the top of the swing frame 81 located at the bottom of the pre-compression frame 7 and in contact with the bottom surface of the pre-compression frame 7. The other end of the swing frame 81 is rotatably mounted with a propulsion wheel 82 located outside the lifting seat 3. A transmission frame 83 is slidably mounted on the inner wall of the lower mold 1 and in contact with the propulsion wheel 82. The other side of the transmission frame 83 is in contact with the outer wall of the positioning block 4. An inclined guide plate 84 that cooperates with the propulsion wheel 82 is mounted on the outer wall of the transmission frame 83. The downward movement of the pre-compression frame 7 can drive the swing frame 81 to rotate. The propulsion wheel 82 and the inclined guide plate 84 cooperate to push the transmission frame 83 to move, thereby realizing the automatic avoidance of the positioning block 4.

[0025] When the pre-compression frame 7 moves down, the bottom of the bottom pressure push mechanism 8 squeezes the top of the swing frame 81, causing the swing frame 81 to rotate around the pivot. The other end of the push wheel 82 extends outward, pushing the transmission frame 83. The transmission frame 83 is forced to slide outward, pushing the positioning block 4 to move outward synchronously. The compression spring 5 is compressed, and the positioning block 4 is completely separated from the side wall of the plate, realizing automatic avoidance before bending and avoiding friction and scratching between the plate and the positioning block 4 during the bending process.

[0026] As one embodiment of the present invention, a torsion spring corresponding to the swing frame 81 is installed in the lifting seat 3, and the swing frame 81 is designed to be inclined. The total downward length of the lifting seat 3 and the pre-pressure frame 7 is less than the length of the transmission frame 83. The torsion spring is used to ensure that the swing frame 81 can be automatically reset, and to ensure that the propulsion mechanism 8 is stable and reliable in cyclic use.

[0027] In one embodiment of the present invention, the lifting mechanism includes an oil storage cylinder 11 installed in the mold groove 2 and a pressing piston 10 slidably installed at the bottom of the lifting seat 3 and slidably connected to the oil storage cylinder 11. The pressing piston 10 is used in conjunction with the limiting post 72. Multiple lifting cylinders 12 are rotatably installed in the lower mold 1 and rotatably connected to the bottom of the pre-bending plate 91. The lifting cylinders 12 are connected to the pressing piston 10 through oil pipes. The limiting post 72 presses down the pressing piston 10 to press hydraulic oil into the lifting cylinder 12, driving the pre-bending plate 91 to rotate upward to achieve pre-bending.

[0028] In one embodiment of the present invention, the pressing piston 10 is located directly below the limiting post 72, and when the pre-pressing frame 7 has not descended, the bottom of the limiting post 72 does not contact the top of the pressing piston 10, ensuring that the bending action is started only after the positioning and avoidance action is completed, so as to realize the step-by-step orderly execution of the process.

[0029] As the pre-compression frame 7 continues to move downward, the limiting post 72 at its bottom contacts and presses down the pressing piston 10, causing the pressing piston 10 to move into the oil storage cylinder 11, which in turn presses hydraulic oil into the lifting cylinder 12 through the oil pipe, pushing the lifting cylinder 12 to extend, thereby driving the pre-bending plate 91 to rotate upward. At this time, the upper mold continues to descend, pushing the plate and the lifting seat 3 to move downward synchronously. The drag-reducing wheel 92 on the top surface of the pre-bending plate 91 contacts the edge of the plate in advance, performing a guiding pre-bending of the plate. The rolling contact of the drag-reducing wheel 92 can greatly reduce friction and mold wear, ensuring a smooth bending surface.

[0030] In one embodiment of the present invention, the cooling mechanism 13 includes a movable cavity 131 opened in the lower mold 1, and a translation piston 132 is slidably installed in the movable cavity 131. The end of the translation piston 132 is equipped with a plurality of sliding rods 133 that are slidably connected to the lower mold 1. The ends of the sliding rods 133 are connected to the push frame 85 in the push mechanism 8. Both ends of the push frame 85 are connected to the side wall of the transmission frame 83. The lower mold 1 is provided with an air inlet groove 134 that communicates with the external environment and an air blowing groove 135 that communicates with the mold groove 2. The air inlet groove 134 and the air blowing groove 135 are both connected to the movable cavity 131 and are both located on one side of the translation piston 132. The lower mold 1 is provided with a one-way valve 136 corresponding to the air inlet groove 134 and the air blowing groove 135. The outer wall of the lifting seat 3 is provided with a plurality of heat dissipation grooves 137. The movement of the transmission frame 83 can drive the translation piston 132 to slide, thereby realizing automatic air extraction and air blowing for cooling.

[0031] As one embodiment of the present invention, multiple one-way valves 136 are provided in the lower mold 1. The one-way valves 136 in the air inlet groove 134 are used to ensure that gas can only enter the movable cavity 131 through the air inlet groove 134. The one-way valves 136 corresponding to the air blowing groove 135 are used to connect the air blowing groove 135 with the movable cavity 131 and to ensure that gas can only be discharged outward through the air blowing groove 135. The air blowing groove 135 has two openings, both of which are designed to be inclined upward. One opening is located outside the lifting seat 3, and the other opening is located at the bottom of the positioning wheel 93. The two inclined airflows can simultaneously and efficiently cool the bending part and the mold.

[0032] During this process, the lifting seat 3 will drive the swing frame 81 to move downwards synchronously. The swing frame 81, while moving downwards, will drive the propulsion wheel 82 to squeeze the inclined guide plate 84 on the outer wall of the transmission frame 83, forcing the transmission frame 83 to slide away from the lifting seat 3 via the propulsion frame 85 and the sliding rod 133, which will drive the translation piston 132. The volume of the movable chamber 131 will increase, creating a negative pressure. External air will enter the movable chamber 131 through the air inlet slot 134 and the corresponding one-way valve 136, completing the automatic air intake and energy storage, which will be used for subsequent air blowing and cooling. Preparation; after bending, the positioning block 4 returns to its original position under the action of the compression spring 5, driving the transmission frame 83, the push frame 85, and the translation piston 132 to return to their original positions simultaneously; when the translation piston 132 returns to its original position, the volume of the movable cavity 131 decreases, and the internal air is blown outward through the air blowing groove 135 and the corresponding one-way valve 136; the two upward-sloping airflows blow towards the outer wall of the bending mechanism 9 and the lifting seat 3 respectively, quickly carrying away the heat generated by bending, realizing real-time cooling, extending the mold life, and avoiding overheating and deformation of the plate.

[0033] The process provided in this embodiment is described below, and specifically includes the following steps: S1: Place the sheet metal to be fitted between the positioning blocks 4, so that the bottom of the sheet metal is in contact with the top surface of the pre-pressing frame 7, and complete the automatic centering and positioning of the sheet metal. S2: Next, start the upper mold to descend, so that the upper mold begins to press down on the plate, causing the plate to move the pre-pressing frame 7 downward. The pre-pressing frame 7 moves downward through the pushing mechanism 8 to push the positioning block 4 outward to avoid the plate and prevent friction and scratches. S3: As the pre-compression frame 7 continues to move downward, the limiting column 72 presses down the pressing piston 10, causing the pre-bending plate 91 to start rotating upward as the plate moves downward, causing the resistance reducing wheel 92 to contact the plate. As the upper die continues to descend, the lifting seat 3 begins to move downward, so that the pre-bending plate 91 begins to squeeze the plate through the resistance reducing wheel 92 to perform pre-bending. S4: When the propulsion mechanism 8 is running, it will push the translation piston 132 to move away from the lifting seat 3, and start to draw the gas from the external environment into the active chamber 131 to complete the storage of cooling gas. S5: As the upper die continues to descend, the plate comes into contact with the positioning wheel 93, and the plate is bent under the cooperation of the positioning wheel 93 and the resistance-reducing wheel 92. The descent distance of the upper die is reduced throughout the operation, thus reducing the load on the equipment. S6: After bending is completed, the upper die rises, and the lifting seat 3 drives the bending mechanism 9 to reset under the action of the resetter 31. At the same time, the formed part is pushed upward and separated from the bending mechanism 9. The positioning block 4 resets under the action of the compression spring 5, which drives the propulsion mechanism 8 to start resetting, thereby pulling the translation piston 132 to reset. This operation blows the gas in the active cavity 131 to the outer wall of the bending mechanism 9 and the lifting seat 3 for rapid cooling.

[0034] Working principle: When this integrated bending and forming equipment for ring main units is working, the sheet metal part of the ring main unit to be bent is first placed on the lower mold 1, so that the part falls between multiple positioning blocks 4. The positioning blocks 4 are used to achieve automatic centering and positioning around the perimeter, ensuring that the part is placed in the center and does not shift. At this time, the bottom of the part is in close contact with the top surface of the pre-pressing frame 7, preparing for subsequent bending. When the equipment is started, the upper mold begins to move downward, contacting and pressing down on the plate. Under pressure, the plate pushes the pre-pressing frame 7 to overcome the elastic force of the lifting spring 71 and move downward. When the pre-pressing frame 7 moves downward, the bottom of the bottom presses the top of the swing frame 81 of the push mechanism 8, causing the swing frame 81 to rotate around the pivot. The push wheel 82 at the other end extends outward, pushing the transmission frame 83. The transmission frame 83 slides outward under force, pushing the positioning block 4 to move outward synchronously. The compression spring 5 is compressed, and the positioning block 4 is completely separated from the side wall of the plate, realizing automatic avoidance before bending and preventing the plate from rubbing and scratching the positioning block 4 during the bending process. As the pre-compression frame 7 continues to move downward, its bottom limiting post 72 contacts and presses down the pressing piston 10, causing the pressing piston 10 to move into the oil storage cylinder 11, which in turn presses hydraulic oil into the lifting cylinder 12 through the oil pipe, pushing the lifting cylinder 12 to extend, thereby driving the pre-bending plate 91 to rotate upward; at this time, the upper mold continues to descend, pushing the plate and the lifting seat 3 to move downward synchronously, and the drag-reducing wheel 92 on the top surface of the pre-bending plate 91 contacts the edge of the plate in advance, performing a guide pre-bending of the plate. The rolling contact of the drag-reducing wheel 92 can greatly reduce friction and mold wear, ensuring a smooth bending surface; During this process, the lifting seat 3 will drive the swing frame 81 to move down synchronously. The swing frame 81 moving down will drive the propulsion wheel 82 to squeeze the inclined guide plate 84 on the outer wall of the transmission frame 83, forcing the transmission frame 83 to drive the translation piston 132 to slide away from the lifting seat 3 through the propulsion frame 85 and the sliding rod 133. The volume of the active chamber 131 increases to form a negative pressure. External air enters the active chamber 131 through the air inlet groove 134 and the corresponding one-way valve 136, completing the automatic air intake and energy storage, in preparation for subsequent air blowing and cooling. As the upper die continues to descend, the sheet metal moves further down with the lifting seat 3, and the bent part of the sheet metal contacts the positioning wheel 93. Under the joint clamping and rolling guidance of the positioning wheel 93 and the drag-reducing wheel 92, the sheet metal is bent and formed at a preset angle in one go. This structure uses the pre-bent plate 91 to assist in the forming in advance and cooperates with the positioning wheel 93 installed on the top of the lower die 1. In addition, with the protruding mold groove 2 on the top of the lifting seat 3, the downward distance of the upper die is significantly shortened, the stamping load is reduced, and the bending accuracy and service life of the equipment are improved. After bending, the upper die rises upward and the pressure disappears; the lifting seat 3 is pushed upward by the resetter 31, pushing the formed sheet metal part out of the mold groove 2, realizing automatic material removal; at the same time, the lifting cylinder 12 returns oil, and the pre-bent plate 91 is reset downward; the positioning block 4 is reset inward by the compression spring 5, driving the transmission frame 83, the push frame 85, and the translation piston 132 to return to their positions synchronously; when the translation piston 132 is reset, the volume of the movable cavity 131 decreases, and the internal air is blown outward through the air blowing groove 135 and the corresponding one-way valve 136; the two inclined upward airflows blow towards the bending mechanism 9 and the outer wall of the lifting seat 3 respectively, quickly carrying away the heat generated by bending, realizing real-time cooling, extending the mold life, and avoiding overheating and deformation of the sheet metal; After the equipment is reset, the molded part can be removed and the next processing cycle can begin. The entire process is automated, including positioning, obstacle avoidance, pre-bending, one-piece molding, automatic material unloading, and automatic cooling. This continuous operation effectively reduces the probability of scratches on the sheet metal and wear on the molds, and improves the bending quality and production efficiency of the ring main unit sheet metal parts.

[0035] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A ring main unit integrated bending and forming equipment, comprising an equipment body composed of an upper mold and a lower mold (1), a mold groove (2), a lifting seat (3), and a resetter (31), characterized in that: The top of the lifting seat (3) protrudes from the mold groove (2). The lower mold (1) is provided with multiple positioning blocks (4), and the outer wall of the positioning blocks (4) is equipped with compression springs (5). The top of the lifting seat (3) is provided with a pre-pressure frame (7), the top of the pre-pressure frame (7) protrudes from the top surface of the lifting seat (3), and the bottom of the pre-pressure frame (7) is connected to a lifting spring (71) and a limiting post (72). The lower mold (1) is provided with a pushing mechanism (8), a bending mechanism (9), a lifting mechanism and a cooling mechanism (13). The pushing mechanism (8) works in conjunction with the pre-pressure frame (7) to push the positioning blocks (4) to separate from the side wall of the plate and to push the translation piston (132) in the cooling mechanism (13) to pump air. The lifting mechanism works in conjunction with the pre-pressure frame (7) to drive the bending mechanism (9) to run. The bending mechanism (9) includes a pre-bending plate (91) and a positioning wheel (93) rotatably mounted on the top of the lower die (1). The bottom of the pre-bending plate (91) is connected to the lifting mechanism, and multiple resistance-reducing wheels (92) are installed on the top surface of the pre-bending plate (91). The positioning wheel (93) is located between the pre-bending plates (91), and the pre-bending plate (91) is used to contact the plate so that after the plate moves down with the lifting seat (3), it will be bent under the restriction of the pre-bending plate (91).

2. The ring main unit integrated bending and forming equipment according to claim 1, characterized in that: The lower mold (1) has a limiting groove on its top for sliding of the positioning block (4), and a limiting seat (6) connected to the positioning block (4) is installed in the limiting groove. The limiting seat (6) consists of a connecting seat connected to the limiting groove and a telescopic rod installed on the outer wall of the connecting seat. The other end of the telescopic rod is connected to the outer wall of the positioning block (4), and the compression springs (5) are all sleeved on the telescopic rod.

3. The ring main unit integrated bending and forming equipment according to claim 1, characterized in that: The propulsion mechanism (8) includes a swing frame (81) rotatably installed in the lifting seat (3), with the top of the swing frame (81) located at the bottom of the pre-compression frame (7) and in contact with the bottom surface of the pre-compression frame (7), and a propulsion wheel (82) located outside the lifting seat (3) rotatably installed at the other end of the swing frame (81). A transmission frame (83) in contact with the propulsion wheel (82) is slidably installed on the inner wall of the lower mold (1), and the other side of the transmission frame (83) is in contact with the outer wall of the positioning block (4). An inclined guide plate (84) for use with the propulsion wheel (82) is installed on the outer wall of the transmission frame (83).

4. The ring main unit integrated bending and forming equipment according to claim 3, characterized in that: The lifting seat (3) is equipped with a torsion spring corresponding to the swing frame (81), and the swing frame (81) is designed to be inclined. The total downward length of the lifting seat (3) and the preload frame (7) is less than the length of the transmission frame (83).

5. The ring main unit integrated bending and forming equipment according to claim 1, characterized in that: The lifting mechanism includes an oil storage cylinder (11) installed in the mold groove (2) and a downward piston (10) slidably installed at the bottom of the lifting seat (3) and slidably connected to the oil storage cylinder (11). The downward piston (10) is used in conjunction with the limiting post (72). Multiple lifting cylinders (12) are rotatably installed in the lower mold (1) and rotatably connected to the bottom of the pre-folding plate (91). The lifting cylinders (12) are connected to the downward piston (10) through oil pipes.

6. The ring main unit integrated bending and forming equipment according to claim 5, characterized in that: The pressing piston (10) is located directly below the limiting post (72), and when the pre-pressing frame (7) is not lowered, the bottom of the limiting post (72) does not contact the top of the pressing piston (10).

7. The ring main unit integrated bending and forming equipment according to claim 3, characterized in that: The cooling mechanism (13) includes a movable cavity (131) opened in the lower mold (1), and a translation piston (132) is slidably installed in the movable cavity (131). Multiple sliding rods (133) that are slidably connected to the lower mold (1) are installed at the end of the translation piston (132). The ends of the sliding rods (133) are connected to the push frame (85) in the push mechanism (8), and both ends of the push frame (85) are connected to the side wall of the transmission frame (83). The mold (1) has an air inlet groove (134) that communicates with the external environment and an air blowing groove (135) that communicates with the mold groove (2). Both the air inlet groove (134) and the air blowing groove (135) are connected to the movable cavity (131) and are located on one side of the translation piston (132). The lower mold (1) is provided with a one-way valve (136) corresponding to the air inlet groove (134) and the air blowing groove (135). The outer wall of the lifting seat (3) has multiple sets of heat dissipation grooves (137).

8. The ring main unit integrated bending and forming equipment according to claim 7, characterized in that: Multiple one-way valves (136) are provided in the lower mold (1). The one-way valve (136) in the air inlet groove (134) is used to ensure that gas can only enter the active cavity (131) through the air inlet groove (134). The one-way valve (136) corresponding to the air blowing groove (135) is used to connect the air blowing groove (135) with the active cavity (131) and ensure that gas can only be discharged outward through the air blowing groove (135). The air blowing groove (135) has two openings that are both designed to be inclined upward. One opening is located outside the lifting seat (3), and the other opening is located at the bottom of the positioning wheel (93).

9. A ring main unit integrated bending and forming process, applicable to the integrated bending and forming equipment for ring main units as described in any one of claims 1-8, characterized in that: The process includes the following steps: S1: Place the sheet metal to be sheet metalled between the positioning blocks (4) so ​​that the bottom of the sheet metal is in contact with the top surface of the pre-pressing frame (7); S2: Then start the upper mold to descend, so that the upper mold begins to press down on the plate, causing the plate to drive the pre-pressing frame (7) to move downward, which pushes the positioning block (4) outward through the propulsion mechanism (8) to avoid the plate; S3: As the pre-compression frame (7) continues to move downward, the limiting column (72) presses down the lowering piston (10), causing the pre-bending plate (91) to start rotating upward as the plate moves downward, causing the resistance-reducing wheel (92) to contact the plate. As the upper mold continues to descend, the lifting seat (3) begins to move downward, so that the pre-bending plate (91) begins to squeeze the plate through the resistance-reducing wheel (92) to perform pre-bending. S4: When the propulsion mechanism (8) is running, it will push the translation piston (132) to move away from the lifting seat (3) and start to draw the gas from the external environment into the active chamber (131); S5: As the upper die continues to descend, the plate comes into contact with the positioning wheel (93), and the plate is bent under the cooperation of the positioning wheel (93) and the resistance-reducing wheel (92). The descent distance of the upper die is reduced throughout the operation. S6: After bending is completed, the upper die rises, and the lifting seat (3) drives the bending mechanism (9) to reset under the action of the resetter (31). At the same time, the forming part is pushed upward and separated from the bending mechanism (9). The positioning block (4) is reset under the action of the compression spring (5), which drives the propulsion mechanism (8) to start resetting, thereby pulling the translation piston (132) to reset. This operation blows the gas in the active cavity (131) to the outer wall of the bending mechanism (9) and the lifting seat (3) to cool it down.

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