Automatic lamination and shaping device for a rotor core

Abstract

The application discloses an automatic stacking and shaping equipment for a rotor core and belongs to the technical field of rotor core stacking and shaping, which comprises an operation table, four guide columns are assembled on the operation table, a moving plate is slidably arranged on the outer surfaces of the four guide columns, a top plate is fixed to the top of the four guide columns, a hydraulic cylinder with one end connected with the moving plate is assembled on the top plate, a positioning assembly for placing the rotor core is assembled at the center of the operation table, and a pressing plate unit is assembled on the lower surface of the moving plate. The pressing plate unit is arranged, convenient disassembly and uniform dispersion of the central pressure received by the lower pressing plate are realized, a T-shaped cross-section closed hydraulic chamber is arranged in the center connecting flange, and a floating plunger arranged in an annular array can balance the central concentrated pressure transmitted by the moving plate through hydraulic oil and uniformly transmit the central concentrated pressure to the whole lower pressing end surface, so that the defects of large central pressure and small edge pressure of the traditional equipment are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rotor core stacking and shaping technology, and in particular to an automatic rotor core stacking and shaping device. Background Technology

[0002] In the field of motor manufacturing, the rotor core is composed of multiple silicon steel sheets stacked one after another. The overall stacking density, end face flatness and stacking uniformity of the core directly determine the subsequent motor assembly accuracy, operating stability and performance.

[0003] Currently, the industry generally uses four-column hydraulic stacking equipment to complete the rotor core stacking and shaping operation. The hydraulic cylinder drives the moving plate to move vertically downward along the guide column, which drives the bottom pressure plate to extrude and stack the positioned iron core into shape.

[0004] However, the lower pressure plate of existing stacking equipment is mostly a rigid, one-piece structure. The pressure is concentrated on the center of the pressure plate by the upper hydraulic cylinder. During the stacking operation, it is easy to form a stress state with excessive central pressure and insufficient edge pressure. It is impossible to evenly distribute the central pressure to the entire iron core end face. Ultimately, the iron core is stacked with a tight middle and loose edges. The overall stacking density of the iron core is inconsistent, the stacking coefficient fluctuates greatly, and the flatness of the end face does not meet the standards, which greatly reduces the qualified rate of the finished iron core. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic stacking and shaping device for rotor cores, in order to solve the problem that the stress state of excessive central pressure and insufficient edge pressure is easily formed during the stacking operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic stacking and shaping device for rotor cores includes an operating table, on which four guide columns are mounted. A movable plate is slidably fitted on the outer surface of the four guide columns. A top plate is fixed on the top of the four guide columns. A hydraulic cylinder connected at one end to the movable plate is mounted on the top plate. A positioning component for placing the core is mounted at the center of the operating table. A pressure plate unit is mounted on the lower surface of the movable plate. The pressure plate unit includes a central connecting flange fixed to the lower surface of the movable plate. A floating pressure plate assembly is mounted on the lower surface of the central connecting flange by means of a guide pin. A hydraulic chamber is provided inside the central connecting flange. The central pressure on the central connecting flange is evenly transmitted and dispersed to the edge through a floating plunger mounted in the hydraulic chamber and acts on the floating pressure plate assembly.

[0007] As a further description of the above technical solution: The bottom wall of the hydraulic chamber has multiple through holes adapted to the floating plunger. The floating plunger is inserted into the through holes. The hydraulic chamber is filled with hydraulic oil, and one end of the floating plunger inserted into the through hole is flush with the bottom wall of the hydraulic chamber.

[0008] As a further description of the above technical solution: The upper surface of the central connecting flange is provided with an oil injection port that communicates with the hydraulic chamber, and a one-way valve is installed in the oil injection port. An oil injection pipe is installed at one end of the one-way valve that passes through the moving plate.

[0009] As a further description of the above technical solution: The floating pressure plate assembly includes a base plate sleeved on a guide pin. A lower pressure plate corresponding to the positioning assembly is inserted into the lower surface of the base plate through a slot. Positioning grooves are provided on the outer wall of the lower pressure plate and the inner wall of the slot. Positioning blocks are inserted into the positioning grooves. A positioning nut is threaded to one end of the guide pin that passes through the base plate.

[0010] As a further description of the above technical solution: The positioning component includes a base mounted on the operating table, on which a positioning mandrel is mounted.

[0011] As a further description of the above technical solution: A pressure sensor is installed on one side of the outer wall of the central connecting flange, and an oil drain hole is opened on the other side of the outer wall of the central connecting flange, with a plug installed in the oil drain hole.

[0012] As a further description of the above technical solution: Each of the floating plungers has a retaining tube fitted on its outer surface, and the top end of the retaining tube is fixed to the lower surface of the central connecting flange. An annular retaining ring is fixed at the edge of the lower surface of each of the retaining tubes. A vertical limiting groove is formed on the outer wall of the floating plunger, and a limiting slider that matches the vertical limiting groove is fixed on the inner wall of the annular retaining ring.

[0013] As a further description of the above technical solution: The four corners of the upper surface of the movable plate are fitted with bushings that are compatible with the guide post, and the movable plate is slidably sleeved on the guide post through the bushings.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The pressure plate unit enables convenient disassembly and assembly of the lower pressure plate and uniform distribution of the central pressure. The T-shaped closed hydraulic chamber inside the central connecting flange, together with the floating plungers arranged in a ring array, can evenly distribute the central concentrated pressure transmitted by the moving plate to the entire lower pressure end face through hydraulic oil. This effectively improves the shortcomings of traditional equipment with high central pressure and low edge pressure, making the overall stacking density of the rotor core consistent, the stacking coefficient stable, and the end face flatness high. This reduces the problems of uneven stacking tightness and insufficient local compaction from the root. The lower pressure plate adopts a plug-in assembly structure with slots and positioning blocks, abandoning the traditional bolt fixing method. The disassembly and assembly operation is simple and quick, and different specifications of lower pressure plates can be quickly replaced. It is suitable for the stacking and processing of rotor cores of various sizes, effectively shortening the equipment changeover and debugging time and improving the efficiency of mass production operations. Attached Figure Description

[0015] Figure 1 A first-view schematic diagram of the overall structure provided according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a hydraulic chamber provided according to an embodiment of the present invention is shown; Figure 3 This diagram shows a cutaway plan view of the central connecting flange portion according to an embodiment of the present invention. Figure 4 A structural breakdown diagram of a floating pressure plate assembly provided according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the overall planar structure provided according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the planar structure of a pressure plate unit provided according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of the structure of the retaining tube provided according to an embodiment of the present invention is shown; Figure 8 A second-view schematic diagram of the overall structure provided according to an embodiment of the present invention is shown; Figure 9 A schematic diagram of the bottom of a substrate provided according to an embodiment of the present invention is shown.

[0016] Legend: 10. Control panel; 11. Guide column; 12. Moving plate; 13. Hydraulic cylinder; 14. Bushing; 20. Positioning component; 21. Base; 22. Positioning spindle; 30. Pressure plate unit; 31. Center connecting flange; 32. Hydraulic chamber; 33. Floating plunger; 34. Guide pin; 35. Floating pressure plate assembly; 351. Base plate; 352. Lower pressure plate; 353. Positioning block; 36. Holding tube; 37. Annular retaining ring; 38. Check valve; 39. Pressure sensor. Detailed Implementation

[0017] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 - Figure 9 As shown, the present invention provides: An automatic stacking and shaping device for rotor cores includes an operating table 10, on which four guide posts 11 are mounted. A movable plate 12 is slidably mounted on the outer surface of the four guide posts 11. A bushing 14 adapted to the guide posts 11 is mounted at each of the four corners of the upper surface of the movable plate 12. The movable plate 12 is slidably mounted on the guide posts 11 through the bushing 14. A top plate is fixed to the top of the four guide posts 11, and a hydraulic cylinder 13 connected at one end to the movable plate 12 is mounted on the top plate. The center of the operating table 10 is equipped with a positioning component 20 for placing iron cores. The positioning component 20 includes a base 21 mounted on the operating table 10, and a positioning mandrel 22 is mounted on the base 21. In particular, the positioning mandrel 22 is used to place stacked iron cores, and it can be disassembled and replaced according to the size of the iron cores.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, a pressure plate unit 30 is assembled on the lower surface of the movable plate 12. The pressure plate unit 30 includes a central connecting flange 31 fixed to the lower surface of the movable plate 12. A floating pressure plate assembly 35 is assembled on the lower surface of the central connecting flange 31 through a guide pin 34. A hydraulic chamber 32 is opened inside the central connecting flange 31. Preferably, the cross-section of the hydraulic chamber 32 is T-shaped, and the central connecting flange 31 is divided into upper and lower parts. The upper half and lower half of the T-shaped cross-section are machined respectively, and the two parts are welded together by vacuum electron beam welding. After welding, all mating surfaces are precision machined to ensure the accuracy requirements. This welding process is existing technology and will not be described in detail here. The central pressure on the central connecting flange 31 is evenly transmitted and dispersed to the edge through the floating plunger 33 assembled in the hydraulic chamber 32 and acts on the floating pressure plate assembly 35. Preferably, the number of floating plungers 33 is 12. The bottom wall of the hydraulic chamber 32 is provided with multiple through holes that are adapted to the floating plunger 33. The floating plunger 33 is inserted into the through holes. In particular, the floating plunger 33 and the inner wall of the through hole are in a sealed state. The hydraulic chamber 32 is filled with hydraulic oil. It should be noted that a vacuum oil injection process is used during oil injection to ensure that there are no air bubbles left in the chamber. The end of the floating plunger 33 inserted into the through hole is flush with the bottom wall of the hydraulic chamber 32. Each of the multiple floating plungers 33 has a retaining tube 36 fitted on its outer surface, and the top end of the retaining tube 36 is fixed to the lower surface of the central connecting flange 31. Each of the multiple retaining tubes 36 has an annular retaining ring 37 fixed at the edge of its lower surface. A vertical limiting groove is provided on the outer wall of the floating plunger 33. A limiting slider that matches the vertical limiting groove is fixed on the inner wall of the annular retaining ring 37. The annular retaining ring 37, in conjunction with the limiting slider, can keep the floating plunger 33 in a vertical state while limiting its range of motion. like Figure 2 , Figure 3 and Figure 6 As shown, the upper surface of the central connecting flange 31 is provided with an oil injection port that communicates with the hydraulic chamber 32, and a one-way valve 38 is installed in the oil injection port. An oil injection pipe is installed at one end of the one-way valve 38 that passes through the moving plate 12. In particular, the oil injection pipe is connected to an external oil injection device (not shown in the figure), and the oil injection device and oil injection method are known technologies and will not be described in detail here. Preferably, the top of the central connecting flange 31 is provided with a vent hole, and a screw plug is provided in the vent hole. Specifically, when injecting oil, hydraulic oil is slowly injected into the hydraulic chamber 32 through the oil injection pipe until oil flows out of the vent hole, and then the screw plug of the vent hole is tightened. A pressure sensor 39 is installed on one side of the outer wall of the center connecting flange 31. The pressure sensor 39 can be used to observe the pressure in the hydraulic chamber 32 in real time. An oil drain hole is opened on the other side of the outer wall of the center connecting flange 31. A plug is installed in the oil drain hole. Specifically, after a period of use, the hydraulic oil in the hydraulic chamber 32 is drained through the oil drain hole by unscrewing the plug, and then new oil is injected again.

[0020] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the floating pressure plate assembly 35 includes a base plate 351 sleeved on a guide pin 34. A lower pressure plate 352 corresponding to the positioning assembly 20 is inserted into the lower surface of the base plate 351 through a slot. Positioning grooves are provided on the outer wall of the lower pressure plate 352 and the inner wall of the slot. A positioning block 353 is inserted into the positioning groove. After the lower pressure plate 352 is placed into the slot, the lower pressure plate 352 is fixed in the slot by inserting the positioning block 353 into the positioning groove, so that it can move up and down with the base plate 351. At the same time, through this design, the lower pressure plate 352 can be quickly disassembled and replaced. A positioning nut is threaded to one end of the guide pin 34 that passes through the base plate 351. Through the setting of the positioning nut, the base plate 351 will not move downward. In the initial state, the substrate 351 rests on the positioning nut under its own weight, maintaining a gap of 0.5mm between itself and the lower end face of the 12 floating plungers 33. When the pressure plate 352 contacts the end face of the iron core, the substrate 351 is pushed upward and away from the positioning nut, and begins to float freely. Under the action of the 12 pressure-equalizing floating plungers 33, the substrate 351 automatically adjusts its angle and position to fully fit the end face of the iron core. As the pressure increases, the substrate 351 continues to float upward until it reaches the maximum floating amount (at which point the iron core has been compacted). Preferably, the maximum floating amount is 6mm. Specifically, during the entire pressing process, the substrate 351 and the pressing plate 352 are in a nearly suspended free state. The guide pin 34 will not exert any upward resistance or downward pull on it, nor will it hinder its angular swing. This ensures that the pressure of the 12 floating plungers 33 can be evenly transmitted to the iron core end face through the pressing plate 352, and there will be no uneven pressure distribution due to the friction of the guide pin 34. When the hydraulic cylinder 13 drives the center connecting flange 31 to return upward, the 12 floating plungers 33 will move upward together with the center connecting flange 31 and separate from the base plate 351. At this time, the base plate 351 will fall downward under its own gravity until its lower surface contacts the upper surface of the positioning nut. After contact, the base plate 351 will form a whole with the center connecting flange 31 through the positioning nut and guide pin 34 and return upward together. There will be no situation of "plate falling off" or "plate getting stuck on the iron core".

[0021] Specifically, the automatic stacking and shaping equipment for this rotor core operates as follows: 1. First, check the hydraulic oil level inside the hydraulic chamber 32 in advance. If the oil level is insufficient, connect the oil injection pipe through the external oil injection equipment to inject hydraulic oil into the hydraulic chamber 32 until oil flows out of the vent hole, then tighten the vent hole plug; at the same time, observe the value displayed by the pressure sensor 39 to confirm that the oil pressure is within the normal operating range. 2. Next, according to the specifications of the rotor core to be processed, select the corresponding size of the lower pressure plate 352, embed it into the bottom slot of the base plate 351, and insert the positioning block 353 for fixation; then, neatly stack the cores and fit them on the positioning mandrel 22 to complete the positioning of the cores. 3. Next, the equipment is started. The hydraulic cylinder 13 drives the moving plate 12 to move smoothly downward along the four guide columns 11, which in turn drives the pressure plate unit 30 to move downward as a whole. After the lower end face of the pressure plate 352 contacts the upper end face of the iron core, the iron core pushes the base plate 351 in the opposite direction, causing the base plate 351 to float upward away from the positioning nut. The downward pressure borne by the central connecting flange 31 is transmitted to the hydraulic chamber 32 and evenly presses each floating plunger 33 through the internal hydraulic oil. The floating plungers 33 extend downward synchronously and evenly press the floating pressure plate assembly 35. The base plate 351 adjusts its angle and position independently to fully fit the end face of the iron core, completes the all-round uniform pressure stacking, and holds the pressure for the set process time to complete the iron core shaping and compaction operation. 4. After the stacking and shaping is completed, the hydraulic cylinder 13 slowly depressurizes and drives the moving plate 12 to return upward. The floating plunger 33 moves upward synchronously with the central connecting flange 31 and separates from the base plate 351. The floating pressure plate assembly 35 falls back under its own weight until it fits the positioning nut and returns to the initial standby position along with the moving plate 12. 5. Finally, after the equipment is reset, the stacked rotor core can be removed from the positioning mandrel 22. If other specifications of cores need to be processed, pull out the positioning insert 353, disassemble and replace the matching lower pressure plate 352, and repeat the above operation to start a new round of stacking processing. It should be noted that after long-term use of the equipment, the drain plug should be unscrewed to drain the old hydraulic oil and refill with new hydraulic oil; and the flexibility of the floating plunger 33, the smoothness of the guide pin 34, and the tightness of the positioning component 20 should be checked regularly to troubleshoot in a timely manner and ensure the long-term stable operation of the equipment.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic stacking and shaping device for rotor cores, comprising an operating table (10), wherein four guide columns (11) are mounted on the operating table (10), a movable plate (12) is slidably fitted on the outer surfaces of the four guide columns (11), a top plate is fixed on the top of the four guide columns (11), and a hydraulic cylinder (13) connected at one end to the movable plate (12) is mounted on the top plate, characterized in that, The center of the operating table (10) is equipped with a positioning component (20) for placing the iron core, and the lower surface of the moving plate (12) is equipped with a pressure plate unit (30). The pressure plate unit (30) includes a central connecting flange (31) fixed to the lower surface of the movable plate (12). A floating pressure plate assembly (35) is mounted on the lower surface of the central connecting flange (31) by means of a guide pin (34). A hydraulic chamber (32) is provided inside the central connecting flange (31). The central pressure on the central connecting flange (31) is uniformly transmitted and dispersed to the edge through the floating plunger (33) assembled in the hydraulic chamber (32) and acts on the floating pressure plate assembly (35).

2. The automatic stacking and shaping equipment for rotor cores according to claim 1, characterized in that, The bottom wall of the hydraulic chamber (32) is provided with multiple through holes that are adapted to the floating plunger (33). The floating plunger (33) is inserted into the through holes. The hydraulic chamber (32) is filled with hydraulic oil, and one end of the floating plunger (33) inserted into the through hole is flush with the bottom wall of the hydraulic chamber (32).

3. The automatic stacking and shaping equipment for rotor cores according to claim 2, characterized in that, The upper surface of the central connecting flange (31) is provided with an oil injection port that communicates with the hydraulic chamber (32), and a one-way valve (38) is installed in the oil injection port, and an oil injection pipe is installed at one end of the one-way valve (38) that passes through the moving plate (12).

4. The automatic stacking and shaping equipment for rotor cores according to claim 3, characterized in that, The floating pressure plate assembly (35) includes a base plate (351) sleeved on a guide pin (34). The lower surface of the base plate (351) is connected to a lower pressure plate (352) corresponding to the positioning assembly (20) through a slot. Positioning grooves are provided on the outer wall of the lower pressure plate (352) and the inner wall of the slot. A positioning block (353) is inserted into the positioning groove. A positioning nut is threaded to one end of the guide pin (34) that passes through the base plate (351).

5. The automatic stacking and shaping equipment for rotor cores according to claim 1, characterized in that, The positioning component (20) includes a base (21) mounted on the operating table (10), and a positioning mandrel (22) is mounted on the base (21).

6. The automatic stacking and shaping equipment for rotor cores according to claim 3, characterized in that, A pressure sensor (39) is installed on one side of the outer wall of the central connecting flange (31), and an oil drain hole is opened on the other side of the outer wall of the central connecting flange (31), and a plug is installed in the oil drain hole.

7. The automatic stacking and shaping equipment for rotor cores according to claim 6, characterized in that, Each of the floating plungers (33) has a retaining tube (36) fitted on its outer surface, and the top end of the retaining tube (36) is fixed to the lower surface of the central connecting flange (31). An annular retaining ring (37) is fixed at the edge of the lower surface of each of the retaining tubes (36). A vertical limiting groove is provided on the outer wall of the floating plunger (33), and a limiting slider that matches the vertical limiting groove is fixed on the inner wall of the annular retaining ring (37).

8. The automatic stacking and shaping equipment for rotor cores according to claim 1, characterized in that, The four corners of the upper surface of the movable plate (12) are each fitted with a bushing (14) that is compatible with the guide post (11). The movable plate (12) is slidably sleeved on the guide post (11) through the bushing (14).

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