Automatic compensation mechanism of plastic encapsulated motor rotor multi-cavity injection mold

Abstract

The application discloses a kind of automatic compensation mechanism of plastic package motor rotor multi-cavity injection mold, it is related to injection compensation technical field.The application includes base, and the rack and injection bench are arranged on base, four groups of array distribution injection units are arranged on injection bench, and the joint driving assembly for uniformly controlling four groups of injection units to carry out height compensation is arranged;Four rectangular holes are opened on the injection bench, each rectangular hole is internally provided with a group of injection units, and the injection unit includes upper cavity and lower cavity, the upper cavity is located directly above the lower cavity, and the two are movably connected, and the lower cavity is internally sequentially provided with bottom cavity, magnet limiting needle fixing plate and up-down power push plate from top to bottom.The application greatly reduces the single start-up defect required when compensation component operates by the mode that four groups of compensation components operate simultaneously driven by single motor, uniformly starts, and carries out respective compensation operation, improves work efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vertical injection molding molds, and particularly relates to an automatic compensation mechanism of a multi-cavity injection molding mold for a plastic-sealed motor rotor. BACKGROUND

[0002] In traditional motor manufacturing, the stator and the rotor are usually made of metal materials and are assembled by mechanical means. This process is cumbersome and costly. In contrast, plastic-sealed motors use plastic materials to replace metals, and use injection molding processes to one-time plastic-seal and form the stator and the rotor, and then assemble them. This process needs to use special injection molding equipment and molds to ensure that the plastic material is accurately injected into the predetermined position, which can not only significantly reduce the cost, but also improve the production efficiency.

[0003] In the rotor plastic-sealing technology, the iron core and the permanent magnet need to be placed in a specific mold cavity, and the injection of the glue, solidification and molding process are completed by a vertical injection molding machine, so as to realize the plastic-sealing of the rotor.

[0004] After the front mold and the rear mold of the traditional rotor injection molding mold are closed, the cavity height is a fixed size, and the height precision of the iron core is extremely demanding. If the height of the iron core exceeds the tolerance range, two extreme faults will be caused. First, when the height of the iron core is lower than the lower limit of the tolerance, a gap is formed between the cavity and the iron core. During the injection molding process, the molten plastic penetrates into the gap, causing the mold glue sealing to fail, and the product to produce flash. Second, when the height of the iron core is higher than the upper limit of the tolerance, the injection molding machine will trigger the overpressure protection mechanism, affecting the production efficiency. In addition, the iron core is prone to deformation and the mold cavity surface is prone to bruising after injection molding, which makes the product difficult to demold, and seriously restricts the production efficiency of the mold.

[0005] The existing rotor injection molding mold lacks an effective multi-cavity iron core height tolerance synchronous automatic compensation scheme. The mainstream method uses a single-cavity mechanical compensation structure, which can only complete the injection molding of one rotor at a time, and the efficiency is low. Moreover, such a mechanical compensation structure is prone to instability under injection pressure.

[0006] In view of the above problems, in the past five years, the market has developed a single-cavity mechanical scheme that can realize height tolerance compensation, but it is still limited to single-rotor injection molding molds. If this single-cavity mechanical structure is applied to a multi-cavity rotor injection molding mold, it will result in a large mold size, reduced reliability, high cost, and cannot meet the batch production demand

[0007] Therefore, the present application provides an automatic compensation mechanism of a multi-cavity injection molding mold for a plastic-sealed motor rotor. SUMMARY

[0008] The purpose of the present application is to provide an automatic compensation mechanism of a multi-cavity injection molding mold for a plastic-sealed motor rotor, which solves the problem that the existing rotor injection molding mold cannot meet different height compensation in the multi-cavity injection molding process.

[0009] To solve the above technical problems, the present application is realized by the following technical solutions:

[0010] The application is a kind of automatic compensation mechanism of plastic encapsulated motor rotor multi-cavity injection mold, including base, and the rack and injection table arranged on the base, four groups of array distribution injection units are arranged on the injection table, and the joint drive assembly for uniformly controlling the height compensation of the four groups of injection units; each group of injection units and the joint drive assembly are connected through a group of compensation assemblies;

[0011] Four rectangular holes are opened on the injection table, and each rectangular hole is provided with a group of injection units, the injection unit includes an upper cavity and a lower cavity, the upper cavity is located directly above the lower cavity, and the two are movably connected, the lower cavity is provided with a bottom cavity, a magnet limiting needle fixing plate and an upper and lower power push plate from top to bottom inside, the bottom cavity, the magnet limiting needle fixing plate and the upper and lower power push plate slide up and down inside the lower cavity, and the bottom of the upper and lower power push plate is movably connected with the compensation assembly;

[0012] The compensation assembly includes an inclined contract, the top inclined surface of the inclined contract is movably connected with the bottom inclined surface of the upper and lower power push plate through a sliding block, two connecting rods are fixedly connected to one end of the inclined contract, the other ends of the two connecting rods are welded to the two side faces of a sleeve, an adjustable bearing is rotatably connected in the sleeve, the adjustable bearing is threadedly connected to a lead screw, and one end of the lead screw is movably connected with the joint drive assembly.

[0013] Preferably, the top of the base is fixedly connected with the rack, and the inside of the rack is welded with the injection table; a downward pressing closed oil cylinder is arranged on the top of the rack, a downward pressing plate is fixedly connected to the bottom output end of the downward pressing closed oil cylinder, and the bottom of the downward pressing plate is fixedly connected with the top of the four groups of injection units.

[0014] Preferably, each corner of the lower cavity is fixedly connected to the injection table through a lower cavity fixing block, the inner wall of the lower cavity is movably connected with the outer side face of the upper and lower power push plate through a key groove, the bottom of the bottom cavity is connected with the magnet limiting needle fixing plate, and the bottom of the magnet limiting needle fixing plate is connected with the upper and lower power push plate.

[0015] Preferably, the bottom of the upper and lower power push plate is fixedly connected with one side of the protruding inclined contract of the pre-pressing spring, the bottom of the pre-pressing spring is fixedly connected to the top of the base, the pre-pressing spring is provided with a support column inside, the bottom end of the support column is welded to the top of the base, and the top of the support column is movably connected with the bottom of the upper and lower power push plate.

[0016] Preferably, four groups of the injection molding units are internally provided with a demolding ejector pin, the demolding ejector pin penetrates through the inclined wedge, the upper and lower power push plate, the magnet limiting needle fixing plate and the bottom cavity to the inside of the lower cavity in sequence, and the bottom of the inclined wedge is provided with a long hole, the demolding ejector pin is movably arranged in the long hole, the bottoms of the four demolding ejector pins of the four groups of injection molding units are fixedly connected to the top output end of the demolding oil cylinder, and the bottom of the demolding oil cylinder is mounted on the base.

[0017] Preferably, a connecting block is mounted on one side of the top of the upper cavity, and the connecting block is fixedly connected to the bottom of the pressing plate.

[0018] Preferably, the combined driving assembly comprises a motor, the motor is fixedly installed on the outer side of the injection molding table, a rectangular annular groove is formed in the inside of the injection molding table, the output end of the motor penetrates through the outer wall of the injection molding table to the inside of the rectangular annular groove, and is fixedly connected to one end of a transmission rod, three transmission rods are installed in the inside of the rectangular annular groove through a plurality of fixing members, and the two ends of the transmission rods with a close distance are movably connected through two first transmission bevel gears, and the included angle between the adjacent two transmission rods is ninety degrees; two second transmission bevel gears are fixedly connected to the two non-adjacent transmission rods respectively, each second transmission bevel gear is meshingly connected with a third transmission bevel gear, and one side of each third transmission bevel gear is fixedly connected with one end of a lead screw of a compensation assembly.

[0019] Preferably, the compensation assembly further comprises a fixed plate, the other end of the lead screw is movably connected to the side surface of the fixed plate; a power sliding rail is arranged above the lead screw, an electric sliding block is slidably arranged in the inside of the power sliding rail, and the bottom of the electric sliding block is fixedly connected with a baffle.

[0020] Preferably, a left-right through rectangular hole is formed in the top of the sleeve, the impact block is movably arranged in the inside of the rectangular hole, the inside of the impact block is a hollow structure, and a V-shaped hole is formed in the inner walls of the opposite sides of the impact block, a pin shaft is slidably arranged in the inside of each V-shaped hole, and the two pin shafts are fixedly connected through a movable block, the bottom of the movable block is inserted into the mounting groove formed in the top of the movable bearing, the top of the movable block is fixedly connected with a fixed spring, and the top end of the fixed spring is fixedly connected with the inner wall of the sleeve.

[0021] Preferably, the first transmission bevel gear, the second transmission bevel gear and the third transmission bevel gear are completely same in size and specification.

[0022] The application has the following beneficial effects:

[0023] The application sets the combined driving assembly, when injection molding, the iron core and the magnet to be injection molded are placed on the bottom cavity inside the lower cavity, the lower pressing plate is driven by the lower pressing closed oil cylinder to press down the upper cavity, so that the upper cavity and the lower cavity are closed, because the height specifications of each iron core and magnet are inconsistent, so according to the height of different iron core and magnet, the motor is started uniformly, after the motor is driven, three transmission rods are rotated at the same time by the first transmission bevel gear, because two second transmission bevel gears are installed on the two opposite transmission rods respectively, so the transmission rod rotates at the same time to drive the second transmission bevel gear to rotate, each second transmission bevel gear is engaged with a third transmission bevel gear, when the second transmission bevel gear drives the third transmission bevel gear to rotate, the third transmission bevel gear side connected screw rod rotates, so the combined driving assembly can drive the compensation assembly of each injection molding unit, the single motor drives four compensation assemblies to work at the same time, which greatly reduces the single start of the compensation assembly operation, unified start, unified compensation operation, improves the work efficiency.

[0024] The application sets the compensation assembly, when the screw rotates under the drive of the combined drive assembly, the surface screw thread connected movable bearing slides from the screw one end close to the third transmission helical gear to the other end of the screw, because the movable bearing rotates and is clamped in the sleeve, so the movable bearing slides and drives the sleeve and the connecting rod on both sides of the sleeve outside to push the inclined contract to slide, the inclined contract is pushed by the connecting rod, gradually lifts the up and down power push plate, so that the up and down power push plate continuously rises in the lower cavity, thereby the height of different iron cores and magnets is compensated; in the process, because the height of the iron core and the magnet in the four groups of injection molding assemblies is not consistent, the compensation height is also inconsistent, here, the control system of the automatic compensation mechanism controls the sliding position of the electric sliding block in the electric sliding rail in the corresponding compensation assembly of each group of injection molding assemblies, if the compensation height is lower, the electric sliding block is closer to the third transmission helical gear, if the compensation height is higher, the electric sliding block is closer to the position of the fixed plate; after adjusting the sliding position of the electric sliding block in the electric sliding rail in the corresponding compensation assembly of each group of injection molding assemblies, the movable bearing is closer and closer to the baffle at the bottom of the electric sliding block in the sliding process, until the collision block collides with the baffle, when the collision block collides with the side of the baffle, at this time, the movable bearing and the sleeve still want to slide forward under the drive of the screw, the pin shaft in the sleeve slides to the left side of the V-shaped hole under the action of inertia, because the left and right ends of the V-shaped hole are higher than the center position, so when the pin shaft slides to the leftmost end of the V-shaped hole, the pin shaft is lifted, and the movable block connected with the pin shaft is also lifted, until the movable block is separated from the mounting groove at the top of the movable bearing, the movable block continues to rotate under the drive of the screw, but at this time, the sleeve and the connecting rod no longer slide forward, finally the compensation process of the injection molding unit is completed, the combined drive assembly continues to drive until all the compensation assemblies corresponding to the four groups of injection molding units are compensated.

[0025] In the application, when the injection molding unit that completes the compensation behavior completes injection molding, the demolding pin is driven upward by the demolding oil cylinder to push the iron core and the magnet after injection molding, the demolding process after injection molding is completed, the motor is restarted, the transmission rod is driven in reverse, the screw drives the movable bearing to slide backward after being driven in reverse, because the compensation distance is inconsistent, the distance to the one end of the screw is also inconsistent, when the movable bearing that arrives first collides with the inner wall of the injection molding platform installed at the one end of the screw through the collision block on the sleeve, the movable bearing is prompted to complete the same process of stopping movement as before, until the four compensation assemblies return to the starting point. BRIEF DESCRIPTION OF DRAWINGS

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention;

[0028] Figure 2 A top view of the internal structure of the rectangular annular groove of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention.

[0029] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0031] Figure 5 A side sectional view of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention.

[0032] Figure 6 A front sectional view of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention.

[0033] Figure 7 This is a schematic diagram of the compensation component structure of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention;

[0034] Figure 8 A partial internal structural diagram of the compensation component of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention;

[0035] Figure 9 A partially disassembled structural diagram of the compensation component of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention;

[0036] Figure 10 This is a partial structural diagram of the compensation component of the automatic compensation mechanism for the multi-cavity injection mold of the encapsulated motor rotor provided by the present invention.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. Base; 2. Frame; 3. Injection table; 4. Motor; 5. Transmission rod; 6. Fixing component; 7. First transmission helical gear; 8. Second transmission helical gear; 9. Third transmission helical gear; 10. Lower pressure sealing cylinder; 11. Lower pressure plate; 12. Connecting block; 13. Upper cavity; 14. Lower cavity; 15. Lower cavity fixing block; 16. Bottom cavity; 17. Magnet limit pin fixing plate; 18. Upper and lower power push plates; 19. Angled wedge; 20. Ejector pin; 21. Preload spring; 22. Support column; 23. Ejector cylinder; 24. Lead screw; 25. Movable bearing; 26. Kit; 27. Connecting rod; 28. Fixed spring; 29. ​​Collision block; 30. Pin; 31. Movable block; 32. Fixing plate; 33. Electric slide rail; 34. Electric slider; 35. Baffle. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] See Figures 1-10 The present invention is an automatic compensation mechanism for a multi-cavity injection mold for a plastic-sealed motor rotor, comprising a base 1, a frame 2 and an injection stage 3 mounted on the base 1, four arrayed injection units mounted on the injection stage 3, and a joint drive assembly for uniformly controlling the height compensation of the four injection units; each injection unit is connected to the joint drive assembly through a compensation assembly, and the base 1 serves as a support device for the injection molding machine to support the entire automatic compensation mechanism;

[0043] The injection molding table 3 is provided with four rectangular holes, and each rectangular hole is provided with a set of injection molding units. The injection molding unit comprises an upper cavity 13 and a lower cavity 14. The upper cavity 13 is located directly above the lower cavity 14 and is movably connected to the lower cavity 14. The lower cavity 14 is sequentially provided with a bottom cavity 16, a magnet limiting needle supporting plate 17 and an upper and lower power push plate 18 from top to bottom. The bottom cavity 16, the magnet limiting needle supporting plate 17 and the upper and lower power push plate 18 are slidably arranged in the lower cavity 14. The bottom of the upper and lower power push plate 18 is movably connected to the compensation assembly.

[0044] The compensation assembly comprises an inclined notch 19. The top inclined surface of the inclined notch 19 is movably connected to the bottom inclined surface of the upper and lower power push plate 18 through a sliding block. The inclined notch 19 is fixedly connected to two connecting rods 27 at one end. The other ends of the two connecting rods 27 are welded to the two side faces of a sleeve 26. An adjustable bearing 25 is rotatably connected in the sleeve 26. The adjustable bearing 25 is threadedly connected to a lead screw 24. One end of the lead screw 24 is movably connected to a joint driving assembly.

[0045] The top of the base 1 is fixedly connected to a rack 2. The inside of the rack 2 is welded to the injection molding table 3. The top of the rack 2 is provided with a downward pressing closed oil cylinder 10. The bottom output end of the downward pressing closed oil cylinder 10 is fixedly connected to a downward pressing plate 11. The bottom of the downward pressing plate 11 is fixedly connected to the top of four sets of injection molding units.

[0046] The corners of the lower cavity 14 are fixedly connected to the injection molding table 3 through a lower cavity fixing block 15. The inner wall of the lower cavity 14 is movably connected to the outer side face of the upper and lower power push plate 18 through a key groove. The bottom of the bottom cavity 16 is connected to the magnet limiting needle supporting plate 17. The bottom of the magnet limiting needle supporting plate 17 is connected to the upper and lower power push plate 18.

[0047] The side of the bottom protruding inclined notch 19 of the upper and lower power push plate 18 is fixedly connected to the top end of a pre-pressing spring 21. The bottom of the pre-pressing spring 21 is fixedly connected to the top end of the base 1. The pre-pressing spring 21 is provided with a supporting column 22. The bottom end of the supporting column 22 is welded to the top of the base 1. The top of the supporting column 22 is movably connected to the bottom of the upper and lower power push plate 18.

[0048] The four sets of injection molding units are provided with a demolding ejector pin 20. The demolding ejector pin 20 penetrates the inclined notch 19, the upper and lower power push plate 18, the magnet limiting needle supporting plate 17 and the bottom cavity 16 to the inside of the lower cavity 14 in sequence. The bottom of the demolding ejector pin 20 is fixedly connected to the top output end of a demolding oil cylinder 23. The demolding oil cylinder 23 is mounted on the base 1.

[0049] The upper cavity 13 is provided with a connecting block 12 on one side of the top thereof, and the connecting block 12 is fixedly connected with the bottom of the pressing plate 11.

[0050] The joint driving assembly comprises a motor 4 fixedly installed on the outer side of the injection table 3, a rectangular annular groove is formed in the interior of the injection table 3, the output end of the motor 4 penetrates through the outer wall of the injection table 3 to the rectangular annular groove in the interior of the injection table 3, and is fixedly connected with one end of a transmission rod 5, three transmission rods 5 are installed in the interior of the rectangular annular groove through a plurality of fixing members 6, and the adjacent two transmission rods 5 are movably connected through two first transmission bevel gears 7 at the ends close to each other, and the included angle between the adjacent two transmission rods 5 is ninety degrees; two second transmission bevel gears 8 are fixedly connected on the two transmission rods 5 which are not adjacent to each other, each second transmission bevel gear 8 is meshingly connected with a third transmission bevel gear 9, and one side surface of each third transmission bevel gear 9 is fixedly connected with one end of a lead screw 24 of a compensation assembly.

[0051] The compensation assembly further comprises a fixed plate 32, and the other end of the lead screw 24 is movably connected to the side surface of the fixed plate 32; an electric sliding rail 33 is arranged above the lead screw 24, an electric sliding block 34 is slidably arranged in the interior of the electric sliding rail 33, and the bottom of the electric sliding block 34 is fixedly connected with a baffle 35.

[0052] The sleeve 26 is provided with a left-right through rectangular hole in the top thereof, the impact block 29 is movably arranged in the interior of the rectangular hole, the interior of the impact block 29 is a hollow structure, and a V-shaped hole is formed in the inner wall of each of the opposite sides of the impact block 29, a pin shaft 30 is slidably arranged in each of the two V-shaped holes, the two pin shafts 30 are fixedly connected through a movable block 31, the bottom of the movable block 31 is inserted into the installation groove in the top of the movable bearing 25, the top of the movable block 31 is fixedly connected with the fixed spring 28, and the top end of the fixed spring 28 is fixedly connected with the inner wall of the sleeve 26.

[0053] The sizes and specifications of the first transmission bevel gear 7, the second transmission bevel gear 8 and the third transmission bevel gear 9 are completely same.

[0054] The working principle of the present application is that: the present application sets up a combined driving assembly, when injection molding, the iron core and the magnet to be injection molded are placed on the bottom cavity 16 inside the lower cavity 14, the lower pressing cylinder 10 is started to drive the lower pressing plate 11 to press down the upper cavity 13, so that the upper cavity 13 and the lower cavity 14 are closed, because the height specifications of each iron core and magnet are inconsistent, therefore, according to the height of different iron cores and magnets, the motor 4 is started uniformly, after the motor 4 is driven, three transmission rods 5 are rotated at the same time through the first transmission bevel gear 7, because two transmission rods 5 on the opposite sides are respectively provided with two second transmission bevel gears 8, therefore, when the transmission rod 5 rotates, the second transmission bevel gear 8 is also rotated, each second transmission bevel gear 8 is in mesh with a third transmission bevel gear 9, when the second transmission bevel gear 8 drives the third transmission bevel gear 9 to rotate, the third transmission bevel gear 9 side connected with the screw rod 24 is also rotated, therefore, through the combined driving assembly, each compensation assembly in four groups of injection molding units can be driven; when the screw rod 24 rotates under the driving of the combined driving assembly, the movable bearing 25 connected with the screw rod 24 is slid from one end of the screw rod 24 close to the third transmission bevel gear 9 to the other end of the screw rod 24, because the movable bearing 25 is rotatably connected in the sleeve 26, therefore, when the movable bearing 25 slides, the sleeve 26 and the connecting rod 27 on the outside of the sleeve 26 are also pushed to slide the inclined contract 19, under the pushing of the connecting rod 27, the upper and lower power push plate 18 is gradually lifted, so that the upper and lower power push plate 18 is continuously lifted inside the lower cavity 14, thereby the height of different iron cores and magnets is compensated; because the heights of the iron cores and magnets in the four groups of injection molding assemblies are inconsistent, therefore, the compensation height is also inconsistent, here, through the control system of the automatic compensation mechanism, the sliding position of the electric sliding block 34 in the electric sliding rail 33 corresponding to the compensation assembly of each injection molding assembly is controlled, if the compensation height is lower, the electric sliding block 34 is closer to the third transmission bevel gear 9, if the compensation height is higher, the electric sliding block 34 is closer to the position of the fixed plate 32.When the sliding position of the electric sliding block 34 in the electric sliding rail 33 is adjusted, the movable bearing 25 is closer and closer to the baffle 35 at the bottom of the electric sliding block 34 in the sliding process, until the impact block 29 collides with the baffle 35. When the impact block 29 collides with the side of the baffle 35, the movable bearing 25 and the sleeve 26 still slide forward under the driving of the lead screw 24. The pin shaft 30 in the sleeve 26 slides to the left side of the V-shaped hole under the action of inertia. Since the left and right ends of the V-shaped hole are higher than the center position, when the pin shaft 30 slides to the left end of the V-shaped hole, the pin shaft 30 is lifted, and the movable block 31 connected with the pin shaft 30 is also lifted, until the movable block 31 is separated from the mounting slot at the top of the movable bearing 25. After the movable bearing 25 is no longer limited by the movable block 31, the movable block 31 continues to rotate under the driving of the lead screw 24, but no longer drives the sleeve 26 and the connecting rod 27 to slide forward, and finally completes the compensation process of the injection molding unit. The combined driving assembly continues to drive until all the compensation assemblies of the four injection molding units are compensated. When the injection molding unit that has completed the compensation process completes the injection molding, the demolding oil cylinder 23 drives the demolding ejector pin 20 to upwardly eject the injected core and magnet, and completes the demolding process. The motor 4 is restarted, the transmission rod 5 is driven in reverse, and the lead screw 24 drives the movable bearing 25 to slide backward. Since the compensation distances are inconsistent, the distances to the one end of the lead screw 24 are also inconsistent. When the movable bearing 25 that reaches first collides with the inner wall of the injection molding table 3 installed at one end of the lead screw 24 through the impact block 29 on the sleeve 26, the movable bearing 25 completes the same process of stopping movement as before, until the four compensation assemblies return to the starting point.

[0055] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An automatic compensation mechanism of a multi-cavity injection mold for a plastic-encapsulated motor rotor, comprising a base (1), a rack (2) and an injection table (3) arranged on the base (1), characterized in that: Four groups of injection units are arranged on the injection platform (3) in array distribution, and a joint driving assembly is arranged to uniformly control the four groups of injection units to perform height compensation. Four rectangular holes are formed on the injection platform (3), and one group of injection units is arranged in each rectangular hole. The injection unit comprises an upper cavity (13) and a lower cavity (14). The upper cavity (13) is located directly above the lower cavity (14) and is movably connected to the lower cavity (14). A bottom cavity (16), a magnet limiting needle supporting fixed plate (17) and an up-down power push plate (18) are sequentially arranged in the lower cavity (14) from top to bottom. The bottom cavity (16), the magnet limiting needle supporting fixed plate (17) and the up-down power push plate (18) slide up and down in the lower cavity (14). The bottom of the up-down power push plate (18) is movably connected to the compensation assembly. The compensation assembly comprises an inclined notch (19). The top inclined surface of the inclined notch (19) is movably connected to the bottom inclined surface of the up-down power push plate (18) through a sliding block. Two connecting rods (27) are fixedly connected to one end of the inclined notch (19). The other ends of the two connecting rods (27) are welded to the two side faces of a sleeve (26). An adjustable bearing (25) is rotatably connected to the inside of the sleeve (26). The adjustable bearing (25) is threadedly connected to a lead screw (24). One end of the lead screw (24) is movably connected to the joint driving assembly. The compensation assembly further comprises a fixed plate (32). The other end of the lead screw (24) is movably connected to the side face of the fixed plate (32). An electric sliding rail (33) is arranged above the lead screw (24). An electric sliding block (34) is movably arranged in the electric sliding rail (33). The bottom of the electric sliding block (34) is fixedly connected to a baffle (35). A left-right through rectangular hole is formed in the top of the sleeve (26). A collision block (29) is movably arranged in the rectangular hole. The collision block (29) has a hollow structure. "V"-shaped holes are formed in the inner walls of the opposite sides of the collision block (29). A pin shaft (30) is movably arranged in each "V"-shaped hole. The two pin shafts (30) are fixedly connected through a movable block (31). The bottom of the movable block (31) is inserted into a mounting groove formed in the top of the adjustable bearing (25). The top of the movable block (31) is fixedly connected to a fixed spring (28). The top end of the fixed spring (28) is fixedly connected to the inner wall of the sleeve (26). The joint driving assembly comprises a first transmission helical gear (7), a second transmission helical gear (8) and a third transmission helical gear (9). The sizes and specifications of the first transmission helical gear (7), the second transmission helical gear (8) and the third transmission helical gear (9) are completely same.

2. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 1, characterized in that, The top of the base (1) is fixedly connected with a rack (2), the inside of the rack (2) is welded with an injection molding table (3), the top of the rack (2) is provided with a lower pressing closed oil cylinder (10), the bottom output end of the lower pressing closed oil cylinder (10) is fixedly connected with a lower pressing plate (11), and the bottom of the lower pressing plate (11) is fixedly connected with the top of four groups of injection molding units.

3. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 2, characterized in that, The lower cavity (14) is fixedly connected with the injection molding table (3) through lower cavity fixing blocks (15) at each corner, the inner wall of the lower cavity (14) is movably connected with the outer side of the upper and lower power push plate (18) through a key groove, the bottom of the bottom cavity (16) is connected with a magnet limiting needle supporting fixed plate (17), and the bottom of the magnet limiting needle supporting fixed plate (17) is connected with the upper and lower power push plate (18).

4. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 3, characterized in that, The bottom of the upper and lower power push plate (18) is fixedly connected with one side of a pre-pressing spring (21) protruding from a bevel (19), the bottom of the pre-pressing spring (21) is fixedly connected with the top of the base (1), the inside of the pre-pressing spring (21) is provided with a supporting column (22), the bottom of the supporting column (22) is welded with the top of the base (1), and the top of the supporting column (22) is movably connected with the bottom of the upper and lower power push plate (18).

5. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 4, characterized in that, The inside of each of the four groups of injection molding units is provided with a demolding ejector pin (20), the demolding ejector pin (20) penetrates the bevel (19), the upper and lower power push plate (18), the magnet limiting needle supporting fixed plate (17) and the bottom cavity (16) to the inside of the lower cavity (14) in sequence, the bottom of the bevel (19) is provided with a long hole, the demolding ejector pin (20) is movably arranged in the long hole, the bottom of the four demolding ejector pins (20) of the four groups of injection molding units is fixedly connected with the top output end of a demolding oil cylinder (23), and the demolding oil cylinder (23) is mounted on the base (1).

6. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 5, characterized in that, The top of the upper cavity (13) is provided with a connecting block (12) on one side, and the top of the connecting block (12) is fixedly connected with the bottom of the lower pressing plate (11).

7. The automatic compensation mechanism of the multi-cavity injection mold for plastic-encased motor rotors according to claim 6, characterized in that, The combined driving assembly further comprises a motor (4), the motor (4) is fixedly mounted on the outer side of the injection molding table (3), the inside of the injection molding table (3) is provided with a rectangular annular groove, the output end of the motor (4) penetrates the outer wall of the injection molding table (3) to the inside of the rectangular annular groove, and is fixedly connected with one end of a transmission rod (5), the inside of the rectangular annular groove is provided with three transmission rods (5) through a plurality of fixing members (6), the ends of the adjacent two transmission rods (5) are movably connected through two first transmission bevel gears (7), and the included angle between the adjacent two transmission rods (5) is ninety degrees; two second transmission bevel gears (8) are fixedly connected on the two non-adjacent transmission rods (5), each second transmission bevel gear (8) is meshingly connected with a third transmission bevel gear (9), and one side of each third transmission bevel gear (9) is fixedly connected with one end of a lead screw (24) of a compensation assembly.

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