Special injection molding machine for EMC (Electro Magnetic Compatibility) cake multi-pole plunger

Abstract

The utility model discloses an EMC (Electro Magnetic Compatibility) cake multi-pole plunger injection molding special machine, which comprises a totally-enclosed mould locking unit, an injection unit and a mould plate assembly, the injection unit comprises an injection unit and a feeding unit, the injection unit is internally provided with multi-pole independent plunger heads which are distributed in a central clearance structure, and the feeding unit is internally provided with a feeding mechanism; a multi-pole material chamber for independently feeding each pole is arranged in the feeding unit; during injection molding, the multi-pole independent plunger head extends into the multi-pole material chamber to push materials, so that multi-pole independent shaft-carrying direct compression injection molding of an injection molded part is realized, and multi-point injection molding is realized through a feeding point. According to the special injection molding machine, a shaft on a part to be subjected to injection molding can be avoided, the part to be subjected to injection molding and the shaft are subjected to injection molding together, the subsequent shaft penetrating procedure is reduced, the tolerance dimensional precision of injection molded products is more stable, the product percent of pass is higher, and the production efficiency is higher. Due to the fact that the multi-pole independent plunger head is matched with the independent material chamber to achieve multi-pole independent direct pressure feeding, the material quantity can be controlled more accurately, and the product percent of pass can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine technical field especially relates to a EMC cake feed multi -pole plunger injection special machine. BACKGROUND

[0002] Injection molding machine is also called injection molding machine or injection molding machine. It is the main molding equipment of thermoplastic or thermosetting plastic using plastic molding die to make various shape plastic products.

[0003] The present market EMC (epoxy plastic sealing material) new energy automobile stator and rotor are more and more widely used, the forming of EMC rotor is all single pole center injection without shaft, and the material handle is large, the raw material waste is serious, and the cost is high. Moreover, after injection molding, the shaft penetrating process needs to be added, which not only complicates the process, but also affects the precision and production efficiency of the product.

[0004] In the field of chip packaging, it has developed from single cylinder mold to multi-cylinder mold injection packaging, for example, Chinese patent document (announcement date: 2013-02-06, announcement number: 102909825A) discloses a kind of independent multi-cylinder, equal pressure, synchronous hydraulic injection system of semiconductor plastic sealing mold, which drives each injection head by multiple independent oil cylinders driven synchronously, to ensure the forming thickness of each plastic sealing cake, further reduce plastic sealing part air hole defect, which can reduce plastic sealing part air hole defect to below 0.1%.

[0005] The technical development of multi-cylinder mold injection brings a new development direction to the injection molding industry.

[0006] Based on this, the utility model develops a kind of injection special machine applied to shaft injection, which divides the glue inlet point into multiple independent injection molding to save raw materials, and also reduces subsequent assembly process, improves production efficiency and improves injection product quality precision. INVENTION CONTENTS

[0007] The utility model aims at solving the problems of existing technology, such as EMC rotor parts forming without shaft single pole center injection, injection material waste, low raw material utilization rate, more waste, high cost, complex processing procedure, unstable injection product size precision and low product pass rate, and provides a kind of EMC cake feed multi-pole plunger injection special machine, which can directly inject with shaft, has high product size precision, can accurately control the amount of each pole material chamber, has high raw material utilization rate, smaller waste material handle, low cost.

[0008] The utility model discloses a special machine for EMC feed multi-pole plunger injection molding, which comprises a fully-closed mold locking unit, an injection unit and a mold plate assembly.

[0009] The special machine for EMC feed multi-pole plunger injection molding is designed by setting a multi-pole independent plunger head in the injection unit and a multi-pole material chamber in the feeding unit. The multi-pole independent plunger head and the multi-pole material chamber are matched to realize independent feeding of each material chamber. The independent plunger head enters the material chamber to realize multi-pole independent injection molding. The multi-pole material chamber is directly connected with the multi-pole flow channel of the mold and realizes straight pressure injection molding of the material in the material chamber by the independent plunger head. The EMC feed in each material chamber is drained to the feeding point to realize multi-point injection molding. The independent material chamber multi-pole feeding can make the feed into several small feeds with the same weight, which can be more accurately controlled to effectively improve the product qualification rate. The small feed design can effectively reduce the material handle generated during the injection molding process, which can reduce the use of raw materials and waste of raw materials. The multi-pole material chamber is designed as the same structure or different structures. When uniform injection molding is needed, the multi-pole material chamber can be designed as the same structure. At this time, the same weight of feed can be added to each material chamber, which can accurately control the amount of material in each glue inlet and improve the product qualification rate. When the product to be injection molded is an eccentric structure, the structure of each material chamber can be designed as different structures to realize the setting and control of different feed weights in different material chambers, which can more accurately control the amount of material in each glue inlet and realize one-to-one control to achieve accurate control, which can make the raw material utilization rate higher and improve the product precision. At the same time, in order to realize the purpose of injection molding of the product with the shaft, the multi-pole plunger head is designed as a central avoidance structure. The position of each independent plunger head avoids the center position, and each material chamber in the multi-pole material chamber also avoids the center position, which can avoid the shaft on the product to be injection molded, realize the design of injection molding of the product with the shaft, reduce the subsequent shaft penetrating process, and make the product tolerance size precision more stable, the product qualification rate higher, and the production efficiency higher.

[0010] As preferred, a plurality of multi-pole runner plates are also included, which are arranged on the upper end surface of the rotor to be injected and are taken in and out of the injection molding machine together with the complete set of rotors to be injected. The plurality of multi-pole runner plates can be taken in and out of the injection molding machine together with the complete set of shaft injection molded parts, improving production efficiency and facilitating multi-pole runner injection molding.

[0011] As preferred, a plurality of multi-pole runner plates are also included, which are arranged on the upper end surface of the rotor to be injected and are taken in and out of the injection molding machine together with the complete set of rotors to be injected. The plurality of multi-pole runner plates can be taken in and out of the injection molding machine together with the complete set of shaft injection molded parts, improving production efficiency and facilitating multi-pole runner injection molding.

[0012] As preferred, the injection unit adopts an electric injection unit, which includes a shot cylinder assembly, a seat cylinder assembly, and an injection head assembly connected with the shot cylinder assembly and provided with the multi-pole independent plunger head. As a preferred solution, the injection unit can adopt an electric injection unit, specifically including a shot cylinder assembly, a seat cylinder assembly, and an injection head assembly. The multi-pole independent plunger head on the injection head assembly is driven by the shot cylinder assembly to achieve multi-pole injection molding.

[0013] As preferred, the shot cylinder assembly is a ball screw assembly, including a ball screw and a screw sleeve arranged outside the ball screw. The injection head assembly is connected to the ball screw through an injection head flange and is driven by the ball screw to move up and down. The multi-pole independent plunger head is driven by the ball screw assembly to achieve multi-pole injection molding. The ball screw can convert rotary motion into linear motion of the multi-pole independent plunger head through a feeding motor and a belt drive, thereby performing pressure injection molding through the multi-pole independent plunger head.

[0014] As preferred, the injection unit adopts a hydraulic injection unit, which includes a shot cylinder assembly and an injection head assembly connected with the shot cylinder assembly and provided with the multi-pole independent plunger head. As another preferred solution, the injection unit can also adopt a hydraulic injection unit. Specifically, the multi-pole independent plunger head is driven by the shot cylinder assembly controlled by hydraulic pressure to move up and down, thereby performing pressure injection molding.

[0015] As preferred, the hydraulic injection cylinder assembly comprises an injection cylinder body and an injection rod, and the injection head assembly is connected with the injection rod through an injection head flange and is driven to move up and down by the injection rod.

[0016] As preferred, the multi-pole material chamber is arranged on a material cup device, the center of the material cup device is provided with a shaft hole, and the multi-pole material chamber is arranged around the shaft hole. The material cup device is provided with a material cup temperature sensor. The multi-pole material chamber is arranged on a material cup device with the center of the material cup device as the distribution center, and the shaft hole is arranged at the center of the material cup device to realize the design structure of the shaft on the wall of the to-be-injected part.

[0017] As preferred, the injection unit is further provided with an injection head heating device, and the injection head heating device is provided with a multi-pole heating station hole corresponding to the multi-pole independent plunger head. In order to realize the heating of the multi-pole independent plunger head, the injection head heating device is provided with a multi-pole heating station hole, so that each pole independent plunger head can be heated independently.

[0018] As preferred, the injection unit is further provided with an injection head heating device, and the injection head heating device is provided with a multi-pole heating station hole corresponding to the multi-pole independent plunger head. In order to realize the heating of the multi-pole independent plunger head, the injection head heating device is provided with a multi-pole heating station hole, so that each pole independent plunger head can be heated independently.

[0019] As preferred, the upper heat preservation tooling comprises a cake shooting device and an upper heat preservation tooling heating and temperature control device, the center of the cake shooting device is provided with a center avoidance hole, and the cake shooting device is provided with a multi-pole shooting hole corresponding to the multi-pole independent plunger head. The upper heat preservation tooling is provided with a cake shooting device and a material cup device, and the multi-pole material chamber is one-to-one corresponding to the multi-pole material chamber shooting hole, which is used for shooting the cake in each pole material chamber along the shooting hole to enter the multi-pole flow channel on the multi-pole flow channel plate, realizing multi-pole injection molding. The center avoidance hole is arranged on the cake shooting device to facilitate the insertion of the shaft on the to-be-injected part with shaft, and to facilitate the realization of injection molding with shaft. The upper heat preservation tooling heating and temperature control device is used for realizing the heating of the cake entering the internal of the upper heat preservation tooling, so that the EMC cake is melted, realizing the integrated operation of melting injection molding in the mold.

[0020] As preferred, the lower heat preservation tooling comprises a to-be-injection-molded part positioning in place detection device, a bottom mold and a lower heat preservation tooling heating and temperature control device.

[0021] As preferred, the lower heat preservation tooling heating and temperature control device is provided with a to-be-injection-molded workpiece loading position, and a lower tooling shaft hole is arranged on the to-be-injection-molded workpiece loading position. The to-be-injection-molded workpiece loading position is arranged on the lower heat preservation tooling heating device to facilitate accurate loading, thereby improving the qualified rate of injection-molded products. The lower tooling shaft hole is arranged to avoid the shaft on the to-be-injection-molded part, so as to realize shaft injection.

[0022] As preferred, the bottom mold is arranged on the lower heat preservation tooling heating and temperature control device.

[0023] The EMC cake multi-pole plunger injection molding special machine can avoid the shaft on the to-be-injection-molded part, realize shaft injection together with the to-be-injection-molded part, reduce the subsequent shaft threading process, make the tolerance size precision of injection-molded products more stable, improve the product qualified rate and production efficiency. The use amount of raw materials can be reduced, and the waste of raw materials can be effectively reduced. The special machine can also be applied to multi-pole injection of EME epoxy plastic sealing cake. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic view of the EMC cake multi-pole plunger injection molding special machine;

[0025] Fig. 2 is a whole structural schematic view of the EMC cake multi-pole plunger injection molding special machine;

[0026] Fig. 3 is a front view of the EMC cake multi-pole plunger injection molding special machine;

[0027] Fig. 4 is a connection structural schematic view of an injection unit and a mold locking unit in the EMC cake multi-pole plunger injection molding special machine;

[0028] Figure 5 Fig. 5 is a front view of the injection unit and the mold locking unit in the EMC cake multi-pole plunger injection molding special machine;

[0029] Figure 6is a structural schematic view of another angle of the injection unit and the mold locking unit in the EMC pellet multi-pole plunger injection special machine of the utility model;

[0030] Figure 7 is a disassembled structural schematic view of the injection head assembly, the material cup device and the heat preservation mold tooling in the utility model;

[0031] Figure 8 is a structural schematic view of the upper heat preservation tooling in the utility model;

[0032] Figure 9 is a structural schematic view of the lower heat preservation tooling in the utility model;

[0033] Figure 10 is a structural schematic view of the multi-pole runner plate in the utility model;

[0034] Figure 11 is a structural schematic view of the material cup device in the utility model;

[0035] Figure 12 is a structural schematic view of the fully-enclosed mold locking unit in the utility model;

[0036] Figure 13 is a structural schematic view of the injection unit (remove injection shield assembly) in the utility model;

[0037] Figure 14 is a structural schematic view of the to-be-injected part (to-be-injected rotor with shaft) in the embodiment 1 of the utility model;

[0038] Figure 15 is a structural schematic view of the to-be-injected part and the lower heat preservation tooling after being assembled in the embodiment 1 of the utility model;

[0039] Figure 16 is an application structural schematic view of the EMC pellet multi-pole plunger injection special machine of the utility model;

[0040] Figure 17 is a structural schematic view of the EMC pellet multi-pole plunger injection special machine in the embodiment 2 of the utility model;

[0041] Figure 18 is a structural schematic view of the injection unit in the embodiment 2 of the utility model;

[0042] Figure 19 is a structural schematic view of another angle of the injection unit in the embodiment 2 of the utility model;

[0043] Figure 20 is a structural schematic view of the rack in the utility model; DETAILED DESCRIPTION

[0044] The technical scheme of the utility model will be explained in further detail below with specific embodiments and in conjunction with the drawings.

[0045] Embodiment 1

[0046] In Figure 1 , Figure 2 , Figure 3 In the embodiment shown, an EMC cake multi-pole plunger injection special machine is provided, which communicates with the production line PLC and adopts a robot to take and place materials. The EMC cake multi-pole plunger injection special machine comprises a rack 1, a fully-enclosed mold locking unit 2, a mold plate assembly 8, an operation box electrical cabinet 3, an injection unit 4, a heat preservation mold tool 5 and the like.

[0047] The fully-enclosed mold locking unit 2 is used to provide a mold locking force to realize mold locking operation, and comprises a mold cylinder assembly 6 and a quick cylinder assembly 7. A fully-enclosed mold locking cover assembly 15 is arranged outside the fully-enclosed mold locking unit 2 to realize fully-enclosed arrangement of the mold locking unit.

[0048] As shown in the figure, Figure 20 The rack 1 comprises a bottom support 11, a side support 12 and a lower mold plate fixing plate 13, and a rack sealing plate assembly 14 is arranged outside the rack. The side support 12 is arranged on both sides of the bottom support 11, the lower mold plate fixing plate 13 is arranged at the upper end of the side support 12 and is arranged parallel to the bottom support 11, and an oil tank for supplying oil to the device is integrated on the bottom support 11. The rack sealing plate assembly 14 is enclosed outside the rack, that is, the rack sealing plate assembly 14 is arranged around the front, rear, left and right of the side support 12 to enclose the mold cylinder assembly 6, the quick cylinder assembly 7, the oil tank and the like arranged inside the rack.

[0049] The lower mold plate fixing plate 13 is provided with a fixing plate slot 16 for facilitating the fully-enclosed arrangement of the fully-enclosed mold locking unit 2. The fully-enclosed mold locking cover assembly 15 is integrated on the rack outside the lower mold plate fixing plate 13 and covers the outside of the mold plate assembly 8.

[0050] The mold plate assembly 8 is arranged on the lower mold plate fixing plate 13. As shown in the figure, Figure 12 The mold plate assembly 8 comprises an upper mold plate 81, a lower mold plate 82, a cylinder lower mold plate 83 and a mold cylinder machine column 84. The mold cylinder machine column 84 is arranged vertically on the cylinder lower mold plate 83, the lower mold plate 82 is arranged on the mold cylinder machine column 84, and the upper mold plate 81 is arranged slidingly on the mold cylinder machine column 84. A temperature measuring sensor 85 is arranged on the lower mold plate 82 to detect the temperature of the mold. In this embodiment, the upper mold plate 81 is arranged to move downward to close the mold.

[0051] The mold cylinder assembly 6 comprises a mold cylinder sleeve 61 and a mold cylinder mandrel 62. The quick cylinder assembly 7 comprises a quick cylinder sleeve 71 and a quick cylinder mandrel 72. The mold cylinder sleeve 6 is connected with the lower mold plate 82 through the fixed plate slot 16, and the lower end of the mold cylinder mandrel 62 is connected with the lower mold plate 83 and can drive the lower mold plate 83 to move up and down. During operation, the mold cylinder assembly drives the upper mold plate to move downward to realize the downward movement of the upper mold plate.

[0052] The quick cylinder sleeve 71 is fixedly connected with the lower plate surface of the lower mold plate 82, and the quick cylinder mandrel 72 is connected with the lower mold plate 83 to realize quick mold opening.

[0053] As shown in Figure 4 , Figure 5 , Figure 6 The injection unit 4 is arranged on the upper mold plate 81. The injection unit 4 comprises an upper upper mold plate 42, an injection unit 9 and a feeding unit 10, and an injection guard assembly 41 is arranged outside the injection unit 4.

[0054] The injection unit 9 adopts an electric injection unit. The electric injection unit comprises a shot cylinder assembly 91, a seat cylinder assembly 92 and an injection head assembly 93. The injection unit 9 is further provided with an injection head heating device 95. The upper upper mold plate 42 is connected with the upper mold plate 81 through a group of first shot cylinder guide columns 43 and can slide up and down along the first shot cylinder guide columns 43. The first shot cylinder guide columns 43 are arranged in four groups. The upper upper mold plate 42 is provided with an injection unit hole 44 at the center position for facilitating the up and down movement of the injection head assembly 93.

[0055] The seat cylinder assembly 92 comprises a seat cylinder sleeve 92-1 and a seat cylinder mandrel 92-2. The seat cylinder assembly 92 is fixed on both sides of the upper upper mold plate 42. The seat cylinder mandrel 92-2 is arranged vertically downward and is connected with the upper mold plate 81 and can drive the injection unit to move up and down to realize the injection function.

[0056] The shot cylinder assembly 91 is arranged on the upper upper mold plate 42 through a group of second shot cylinder guide columns 45. As shown in Figure 13As shown, the injection cylinder assembly 91 is a ball screw assembly. The ball screw assembly includes a ball screw 91-1 and a screw sleeve 91-2 disposed outside the ball screw 91-1. An injection head flange 94 is fitted over the screw sleeve 91-2. A motor seat 46 is fixedly connected to the upper end of the second injection cylinder guide post 45. The ball screw 91-1 is rotatably mounted on the motor seat 46 via a set of bearing assemblies 47, and the ball screw 91-1 is vertically downward and coaxially aligned with the mold cylinder spindle 62. A sensor fixing plate 48 is slidably disposed on the second injection cylinder guide post 45, and a weighing sensor 49 is connected to the lower surface of the sensor fixing plate 48 for feedback signals. The ball screw 91-1 extends through the sensor fixing plate 48 and the weighing sensor 49 to above the upper mold plate 42. The injection head assembly 93 is connected to the injection head flange 94.

[0057] An injection head heating device 95 is provided on the upper template 42 for heating and temperature control of the injection head assembly 93. The injection head heating device 95 has multi-stage heating station holes 95-1 corresponding to the multi-stage independent plunger head 93-2.

[0058] The feeding unit 10 includes a feeding motor 101 and a material cup device 96 with a multi-stage material chamber 96-1. The feeding motor 101 is connected to the motor base 46 via a feeding motor adjustment plate 102, which adjusts the horizontal and vertical positions of the feeding motor 101. An injection pulley 103 is mounted on the output shaft of the feeding motor 101, and an injection pulley 104 is connected to the upper end of the ball screw 91-1. An injection timing belt 105 is wound around the injection pulleys 103 and 104. When the feeding motor 101 operates, it transmits power to the ball screw 91-1, causing the ball screw 91-1 to move. The ball screw 91-1 then moves the injection head assembly 93 connected to it, feeding and pressing material into the multi-stage material chamber 96-1 through the injection head assembly 93.

[0059] like Figure 7 As shown, the injection head assembly 93 includes an injection head connecting flange 93-1 and multi-stage independent plunger heads 93-2 fixed to the injection head connecting flange 93-1 and distributed in a centrally recessed structure. The number of independent plunger heads 93-2 is ≥2, and can be set to an even number such as 2, 4, 6, 8, 10, etc., or an odd number such as 3, 5, 7, 9, etc., depending on the needs of the part to be injection molded. Corresponding to the injection head assembly 93, a material cup device 96 is provided on the upper mold plate 81, such as... Figure 11As shown, the material cup device 96 is provided with a multi-pole material chamber 96-1 for corresponding each independent plunger head 93-2 to add material separately. The number of material chambers in the multi-pole material chamber 96-1 is one-to-one corresponding to the independent plunger head, and the number is ≥ 2.

[0060] The material cup device 96 is also provided with a material cup temperature sensor 96-2 for detecting the temperature of the material cup to control the gelatinization temperature of the cake. The shaft hole 96-3 is provided at the center of the material cup device, and the multi-pole material chamber 96-1 is distributed outside the shaft hole 96-3 along the axis of the material cup device. The multi-pole material chamber 96-1 can be provided with the same structure or different structures. When uniform injection is required, the multi-pole material chamber 96-1 is provided with the same structure, at this time, the same weight of cake can be added in each material chamber, the amount of material of each glue inlet can be accurately controlled, the control is more accurate, and the qualified rate of the product is improved. When the product to be injection molded is an eccentric structure, the structure of each material chamber can be different to realize the setting and control of different cake weights in different material chambers, more accurately control the amount of material of each glue inlet, realize one-to-one corresponding control, achieve the purpose of accurate control, and make the raw material utilization rate higher and improve the product precision.

[0061] In order to realize multi-pole plunger injection, the injection head assembly 93 is also provided with a heat preservation mold tool 97. In use, the heat preservation mold tool 97 is arranged between the lower mold plate 82 and the upper mold plate 81, and the overall injection of the shaft of the injection molded part is realized by clamping. The heat preservation mold tool 97 includes an upper heat preservation tool 98 and a lower heat preservation tool 99.

[0062] As shown in Figure 8 The upper heat preservation tool 98 includes a cake ejection device 98-1 and an upper heat preservation tool heating and temperature control device 98-2. The cake ejection device 98-1 is connected with the multi-pole material chamber 96-1, and is used for heating and ejecting the cake to form injection glue under the action of high temperature, and then realizes the injection of the injection molded part. The center of the cake ejection device 98-1 is provided with a center avoiding hole 98-3 for conveniently avoiding the center shaft of the rotor or stator of the injection molded part, so as to realize the purpose of shaft injection. The cake ejection device 98-1 is provided with a multi-pole ejection hole 98-4 corresponding to the multi-pole independent plunger head 93-2, and the multi-pole ejection hole 98-4 forms the glue inlet on the upper mold assembly of the mold. The upper heat preservation tool heating and temperature control device 98-2 is used for heating and preserving the cake in the multi-pole material chamber 96-1 to meet the requirements of injection glue.

[0063] As shown in Figure 9As shown, the lower insulation fixture 99 includes a multi-stage flow channel plate 90, a part-to-be-injected-part positioning detection device 99-1, a bottom mold 99-4, and a lower insulation fixture heating and temperature control device 99-2. The part-to-be-injected-part positioning detection device is used to detect whether the part-to-be-injected-part with shaft has been positioned and whether the positioning position meets the set standards. When the positioning meets the set requirements, the mold closing operation is performed. In this embodiment, the positioning and positioning of the part-to-be-injected-part with shaft is detected. The lower insulation fixture heating and temperature control device 99-2 is used to heat and control the temperature of the lower mold.

[0064] The lower insulation fixture heating and temperature control device 99-2 is provided with a workpiece loading position 99-3 for fixing the workpiece to be injected. The workpiece loading position 99-3 is provided with a lower tooling shaft hole 99-5. The lower insulation fixture avoids the rotor shaft, and a mating surface is provided at the step of the lower insulation fixture at a distance from the lower surface of the rotor with shaft.

[0065] A detachable bottom mold 99-4 is also provided at the lower end of the complete set of rotors with shafts. The bottom mold 99-4 is detachably fixed to the heating and temperature control device of the lower insulation device to form the lower mold assembly. One bottom mold can be made for backup, realizing detachable transfer.

[0066] like Figure 10 As shown, it also includes several multi-stage flow channel plates 90 that flow along the line, used to enter and exit the injection molding machine together with the parts to be injection molded, thereby improving production efficiency. The multi-stage flow channel plates 90 cooperate with the lower insulation fixture 99 to form the lower mold assembly.

[0067] The multi-stage flow channel plate 90 is provided with multi-stage flow channels 90-1. The number of flow channels in the multi-stage flow channels 90-1 corresponds one-to-one with the multi-stage material chambers. The number of flow channels is ≥2, forming the injection port 20 on the lower mold assembly. Each flow channel 90-1 can cover multiple feeding points 90-2. The number of feeding points is divided into groups according to the number of magnets to be injected, with 3 magnets per group and 1 magnet per group having two feeding points, for a total of 6 feeding points. An ejection hole 90-3 is opened in the center of each flow channel 90-1 to facilitate the ejection of waste material through a clearing tool. A flow channel plate shaft hole 90-4 is provided in the center of the multi-stage flow channel plate to facilitate the insertion of a shaft onto the part to be injected, so as to achieve the purpose of shaft injection molding. During injection molding, the multi-stage independent plunger head extends into the corresponding multi-stage material chamber for independent direct pressure feeding. The cake material enters the multi-stage flow channel directly through the multi-stage material chamber, realizing multi-stage direct pressure feeding. The EMC cake material in each stage material chamber is guided to the feeding point, and multi-point injection molding is achieved through the feeding point.

[0068] The injection-molded part in this embodiment is a rotor with shaft, and the multi-pole runner plate 90 is arranged on the upper end surface of the rotor to be injection-molded and is taken in and out of the injection molding machine together with the complete rotor to be injection-molded. Eight pole runners 90-1 are evenly distributed on the multi-pole runner plate 90, each pole runner 90-1 covers a group of three magnetic steels, and there are a total of six feeding points 90-2; a ejection hole 90-3 is provided at the center of each runner 90-1 for removing waste material with a dredging tool, and a runner plate shaft hole 90-4 is provided at the center of the multi-pole runner plate 90 for the passage of the central shaft of the rotor to be injection-molded.

[0069] In this embodiment, eight independent plunger heads 93-2 are provided with eight pole material chambers 96-1. During use, the EMC pie-shaped material is placed in the eight material chambers 96-1 of the cup device 96, the injection molding machine is closed and high pressure is generated, the eight independent plunger heads 93-2 on the injection cylinder assembly 91 are pressed down at the same time, the pie-shaped material is pressed into the corresponding feeding port of the mold upper mold assembly, the mold upper mold assembly is in a heated state to melt the EMC pie-shaped material, and after pressure holding by the independent plunger head 93-2, the raw material solidifies, and the injection molding machine is opened to take the product.

[0070] Multi-pole simultaneous injection, eight independent plunger heads 93-2 correspond to eight feeding ports of the mold upper mold assembly for injection-molded parts, and independent simultaneous injection is performed. The pie-shaped material corresponding to the eight feeding ports has the same weight, and compared with single-pole injection-molded products, the material quantity control is more accurate, and the product qualification rate is improved. Since the eight feeding ports are distributed around the central shaft of the rotor, they will not affect the passage of the central shaft, and the injection-molded product can be pre-assembled with the central shaft and then injection-molded with the shaft.

[0071] A cleaning mechanism 30 for achieving cleaning is also provided in the injection unit. Thus, full-automatic injection molding can be achieved, and the inconvenience caused by manual cleaning is avoided.

[0072] During use, the EMC pie-shaped material is placed in the multi-pole material chamber of the cup device, the injection molding machine is closed and high pressure is generated, the multi-pole independent plunger head on the injection assembly is pressed down at the same time, the pie-shaped material is pressed into the corresponding feeding port, the mold is in a heated state to melt the EMC pie-shaped material, and after pressure holding by the injection plunger, the raw material solidifies, and the injection molding machine is opened to take the product.

[0073] As shown in Figure 14 , Figure 15 In this embodiment, an EMC new energy automobile rotor is injection molded as an example, and the injection molding process of the EMC pie-shaped material multi-pole plunger injection molding special machine is described in detail. The injection-molded part 50 is a rotor to be injection-molded with a shaft, with a diameter of Φ145.6mmXØ75X148.8, a filling material weight of 285 grams (specific gravity 1.89), and about 36 grams per pole. The expected amount of each pole runner is about 7 grams.

[0074] The to-be-injection-molded rotor is provided with a rotor spindle 50-1 before injection molding, the rotor spindle end face 50-2 serves as a feeding face, and 8-pole feeding ports 50-3 are arranged around the center, each pole feeding port 50-3 is independently fed, and the core is filled. In this embodiment, the raw material EMC is used, the cake diameter is Φ18 mm, the cake thickness is 24 mm, the weight of a single cake is 11.4 g, and the maximum injection pressure is 70 Bar. The shaft rotor injection molding temperature is 175℃.

[0075] As shown in Figure 16 , the specific process steps are as follows: the injection molding machine communicates with the production line PLC, and the robot is automatically operated for picking and placing.

[0076] Step 1: The injection molding machine sends a signal to the robot to allow picking and placing of the to-be-injection-molded part (to-be-injection-molded part with shaft 50); that is, the injection molding machine sends a signal to the picking robot to allow picking and placing of the rotor;

[0077] Step 2: The robot picks the to-be-injection-molded rotor with shaft from the assembly line and places it on the to-be-injection-molded workpiece loading position 99-3 on the lower mold assembly of the injection molding machine, and the picking robot gripper temperature sensor detects the temperature of the multi-pole runner plate 90 and the rotor core;

[0078] Step 3: When the temperature sensor detects that the temperature of the core is greater than 175℃, the robot picks and feeds, and if the detected temperature is lower than 175℃ and higher than 150℃, the robot waits until the temperature reaches 175℃ before picking and feeding;

[0079] Step 4: The robot sends a signal to the injection molding machine to complete the placing;

[0080] Step 5: The upper mold plate 81 of the injection molding machine descends, the mold is closed, and the product temperature is detected again;

[0081] Step 6: The injection molding machine sends a signal to the feeding unit 10 to allow feeding, and the feeding unit 10 (or robot) moves the completed weight detection cake to the feeding port of the cup device 96, and then feeds it into the multi-pole material chamber 96-1;

[0082] Step 7: The feeding structure 10 (robot) sends a feeding completion signal to the injection molding machine;

[0083] Step 8: The injection cylinder assembly 91 drives the independent plunger head 93-2 to enter the multi-pole material chamber 96-1, and the independent plunger head 93-2 is heated to an abnormal temperature and an alarm is given;

[0084] Step 9: The injection molding machine is pressure-keeping and curing (time, displacement, and pressure are controlled in multiple ways, the displacement accuracy is 0.01 mm, and the injection pressure sensor detects the pressure);

[0085] Step 10: After curing, the injection molding machine is opened;

[0086] Step 11: the injection molding machine sends a signal to the robot to allow the robot to pick up the product, and the CCD vision determines whether the shape of the molded product is OK; (the weight sensor determines whether the filling is good);

[0087] Step 12: the injection molding machine sends a cleaning signal to the injection molding machine cleaning mechanism 30;

[0088] Step 13: the injection molding machine cleaning mechanism 30 starts cleaning, and when the cleaning is completed, the injection molding machine cleaning mechanism 30 sends a cleaning completion signal to the injection molding machine;

[0089] Step 14: enter the next injection molding operation, and repeat the cycle.

[0090] Example 2:

[0091] In Figure 17 , Figure 18 , Figure 19 the embodiment shown, an EMC pie multi-pole plunger injection special machine, the technical scheme is basically the same as that of example 1, the difference lies in that the injection molding machine communicates with the production line PLC, adopts a robot to take and place materials, and adopts a robot to place the pie. As shown in Figure 20 , a hydraulic station 40 is further arranged in the rack.

[0092] The mold plate assembly 8 is arranged on the lower mold plate fixed plate 13. The mold plate assembly 8 includes an upper mold plate 81, a lower mold plate 82, a cylinder lower mold plate 83, and a mold cylinder machine column 84. The mold cylinder machine column 84 is arranged vertically on the cylinder lower mold plate 83, and the cylinder lower mold plate 83 is fixed on the rack. The lower mold plate 82 is arranged slidingly on the mold cylinder machine column 84, and the upper mold plate 81 is fixed on the upper end of the mold cylinder machine column 84. A temperature measuring sensor 85 is arranged on the lower mold plate 82 for detecting the temperature of the mold. In this embodiment, the lower mold plate 82 is used for up-mold clamping.

[0093] The mold cylinder assembly 6 includes a mold cylinder sleeve 61 and a mold cylinder core shaft 62. The quick cylinder assembly 7 includes a quick cylinder sleeve 71 and a quick cylinder core shaft 72. The mold cylinder sleeve 6 is connected to the lower mold plate 82 through the slot 16 of the fixed plate, and the lower end of the mold cylinder core shaft 62 is connected to the cylinder lower mold plate 83 and can drive the lower mold plate to move up and down. When working, the mold cylinder assembly drives the lower mold plate to move upward, realizing up-mold clamping.

[0094] The quick cylinder sleeve 71 is fixedly connected to the lower plate surface of the lower mold plate 82, and the quick cylinder core shaft 72 is connected to the cylinder lower mold plate 83 for providing a quick mold opening force.

[0095] The injection unit 4 is arranged on the upper die plate 81. The injection unit 4 comprises an injection unit 9 and a feeding unit 10, and the feeding unit 10 comprises a feeding cup device 96 with a multi-pole material chamber 96-1 and a feeding robot (not shown in the figure). The feeding robot is used to pour the cake material into the multi-pole material chamber 96-1 to facilitate the injection feeding of the injection unit. An injection shield assembly 41 is arranged outside the injection unit 4.

[0096] The injection unit 9 is a hydraulic injection unit. The hydraulic injection unit comprises a hydraulic injection cylinder assembly 91 and an injection head assembly 93.

[0097] The seat cylinder assembly 92 comprises a seat cylinder sleeve 92-1 and a seat cylinder shaft 92-2, and the seat cylinder assembly 92 is fixed on both sides of the upper upper die plate 42. The seat cylinder shaft 92-2 is arranged vertically downward and connected with the upper die plate 81 to drive the injection unit to move up and down to realize the injection function.

[0098] An injection head heating device 95 is arranged on the upper upper die plate 42 to realize the heating and temperature control of the injection head assembly 93. The injection head heating device 95 is provided with a multi-pole heating station hole 95-1 corresponding to the multi-pole independent plunger head 93-2.

[0099] The injection unit 9 is connected above the upper die plate 81 through a group of plunger guide rods 9-1 and an injection fixing plate 9-6, and the injection fixing plate 9-6 is fixed on the upper end of the plunger guide rod 9-1. A plunger guide plate 9-2 is arranged on the plunger guide rod 9-1 below the injection fixing plate 9-6.

[0100] The hydraulic injection cylinder assembly 91 comprises an injection cylinder body 9-3 and an injection rod 9-4. The injection cylinder body 9-3 is fixed on the injection fixing plate 9-6, and the injection cylinder rod 9-4 is arranged vertically downward and connected with the plunger guide plate 9-2 through a guide 9-5 to drive the plunger guide plate 9-2 to move up and down. The injection head assembly 93 is connected below the plunger guide plate 9-2 through an injection head flange 94 and moves up and down with the plunger guide plate 9-2. The weighing sensor 49 is arranged on the lower plate surface of the plunger guide plate 9-2 and connected with the upper end of the injection head flange 94.

[0101] The injection head assembly 93 comprises an injection head connecting flange 93-1 and a plurality of independent plunger heads 93-2 arranged in a central empty structure and fixed on the injection head connecting flange 93-1. In this embodiment, there are six independent plunger heads 93-2.

[0102] The corresponding injection head assembly 93 is provided with a cup device 96 on the upper mold plate 81, and the cup device 96 is provided with six multi-pole material chambers 96-1 for separately adding material for each independent plunger head 93-2. The cup device 96 is also provided with a cup temperature sensor 96-2 for detecting the temperature of the material in the multi-pole material chamber. The shaft center hole 96-3 is provided at the shaft center of the cup device, and the multi-pole material chambers 96-1 are distributed outside the shaft center hole 96-3 along the axis of the cup device. The multi-pole material chambers 96-1 have the same structure, and the same weight of material can be added to each chamber, which can accurately control the amount of material at each feeding port, control more accurately, and improve the qualification rate of products.

[0103] In order to realize multi-pole plunger injection molding, the injection head assembly 93 is also provided with a heat preservation mold tool 97. In use, the heat preservation mold tool 97 is arranged between the lower mold plate 82 and the upper mold plate 81, and the overall injection molding of the shafted injection molded part is realized by clamping. The heat preservation mold tool 97 includes an upper heat preservation tool 98 and a lower heat preservation tool 99.

[0104] The upper heat preservation tool 98 includes a material ejection device 98-1 and an upper heat preservation tool heating and temperature control device 98-2. The material ejection device 98-1 is connected with the multi-pole material chamber 96-1, and is used for heating and ejecting the material to form injection material under high temperature, thereby realizing injection molding of the injection molded part. The center of the material ejection device 98-1 is provided with a center avoidance hole 98-3 for facilitating the passage of the center shaft of the rotor or stator of the shafted injection molded part, thereby realizing the purpose of shaft injection molding. The material ejection device 98-1 is provided with a multi-pole ejection hole 98-4 corresponding to the multi-pole independent plunger head 93-2. The upper heat preservation tool heating and temperature control device 98-2 is used for heating and preserving the material in the multi-pole material chamber 96-1, so as to meet the requirements of the injection material.

[0105] The lower heat preservation tool 99 includes a multi-pole runner plate 90, a positioning and in-place detection device 99-1 for the injection molded part to be injected, a bottom mold 99-4, and a lower heat preservation tool heating and temperature control device 99-2. The positioning and in-place detection device for the injection molded part to be injected is used for detecting whether the injection molded part to be injected has been positioned and whether the positioning position meets the set standard, and when the positioning meets the set requirements, clamping operation is performed. The lower heat preservation tool heating and temperature control device 99-2 is used for heating and controlling the temperature of the lower mold.

[0106] The lower heat preservation tool heating and temperature control device 99-2 is provided with an injection molded part loading position 99-3 for fixing the injection molded part, and the injection molded part loading position 99-3 is provided with a lower tool shaft hole 99-5.

[0107] A detachable bottom mold 99-4 is arranged at the lower end of the set of shafts of the to-be-injected parts, and the bottom mold 99-4 is detachably fixed on the lower heat preservation tooling heating and temperature control device to form a mold lower mold assembly. The bottom mold can be used as a spare part to realize detachable circulation.

[0108] A plurality of multi-pole runner plates 90 are also included for entering and exiting the injection molding machine together with the to-be-injected parts to improve production efficiency. The multi-pole runner plate 90 cooperates with the lower heat preservation tooling 99 to form a mold lower mold assembly.

[0109] The multi-pole runner plate 90 is provided with six multi-pole runners 90-1 to form the glue inlet 20 on the mold lower mold assembly. Each runner 90-1 can be provided with a plurality of feeding points 90-2, and a knockout hole 90-3 is arranged at the center of each runner 90-1 to facilitate the ejection of waste materials through the dredging tooling. A runner plate shaft hole 90-4 is arranged at the center position of the multi-pole runner plate for facilitating the insertion of the shaft of the shaft to-be-injected part to achieve the purpose of shaft injection molding. During injection molding, the multi-pole independent plunger head extends into the corresponding multi-pole material chamber for independent direct pressure feeding. The cake material directly enters the multi-pole runner through the multi-pole material chamber to realize multi-pole direct pressure feeding. The EMC cake in each pole material chamber is guided to the feeding point, and multi-point injection molding is realized through the feeding point.

[0110] The specific process flow steps are as follows: the injection molding machine communicates with the production line PLC, and the taking and placing of parts is automatically operated by a robot.

[0111] Step 1: The injection molding machine sends a signal to the robot allowing the taking and placing of parts (taking and placing the shaft to-be-injected part 50); that is, the injection molding machine sends a signal to the taking robot allowing the taking and placing of the rotor;

[0112] Step 2: The robot grasps the to-be-injected part from the assembly line and places it on the to-be-injected part loading position 99-3 of the mold lower mold assembly of the injection molding machine. The taking robot gripper temperature sensor detects the temperature of the multi-pole runner plate 90 and the to-be-injected part;

[0113] Step 3: When the temperature sensor detects that the temperature of the to-be-injected part is greater than the set temperature, the robot grasps and feeds. If the detected temperature is lower than the set temperature, the robot grasps and feeds after the temperature reaches the set temperature;

[0114] Step 4: The robot sends a signal to the injection molding machine indicating that the placing of parts is complete;

[0115] Step 5: The injection molding lower mold plate 82 moves upward, the mold is closed, and the product temperature is detected again;

[0116] Step 6: The injection molding machine sends a signal to the feeding unit 10 allowing feeding. The feeding unit 10 (or the robot) moves the cake that has completed weight detection to the feeding port of the material cup device 96, and then feeds it into the multi-pole material chamber 96-1;

[0117] Step 7: The feeding structure 10 robot sends a feeding completion signal to the injection molding machine;

[0118] Step 8: The injection cylinder assembly 91 drives the independent plunger head 93-2 to enter the multi-pole material chamber 96-1, and the injection molding is filled, and the independent plunger head 93-2 is abnormally heated to alarm;

[0119] Step 9: The injection molding machine is pressure-keeping and solidifying (time, displacement, and pressure multiple control, displacement accuracy 0.01mm, injection pressure sensor detects pressure);

[0120] Step 10: The solidification is completed, and the injection molding machine is opened;

[0121] Step 11: The injection molding machine sends a signal to the robot to allow the part to be taken, and the CCD vision is used to determine whether the shape of the molded product is OK; (the weight sensor is used to determine whether the filling is good);

[0122] Step 12: The injection molding machine sends a cleaning signal to the injection molding machine cleaning mechanism 30;

[0123] Step 13: The injection molding machine cleaning mechanism 30 starts cleaning, and after the cleaning is completed, the injection molding machine cleaning mechanism 30 sends a cleaning completion signal to the injection molding machine;

[0124] Step 14: The next injection operation is entered, and the cycle is repeated.

[0125] The EMC cake multi-pole plunger injection special machine described in the above embodiment adopts a multi-pole plunger head cooperating with a multi-pole material chamber, so that the multi-pole plunger head is distributed around the mold and the to-be-injected part with the center of the mold and the to-be-injected part as the distribution center, avoids the center of the to-be-injected part, can realize injection molding of the to-be-injected part with the shaft, reduces the subsequent shaft penetrating process, realizes one-piece injection molding, and the dimensional accuracy of the injection molded product is more stable, thereby effectively improving the production efficiency and product qualification rate. Moreover, through the multi-pole material chamber, the multi-pole injection is realized, the cake in each pole material chamber can be independently fed, the cake in each pole material chamber can be fed with the same weight, the material amount can be more accurately controlled, the raw material utilization rate is high, the injection material handle is smaller, and the generation of waste material is greatly reduced, thereby effectively reducing the production cost.

[0126] The above embodiments are only part of the embodiments of the present application, not all embodiments. Meanwhile, based on the embodiments described in the present application, all other embodiments obtained on the basis of the technical solutions of the present application without creative labor of those skilled in the art should belong to the protection scope of the present application.

Claims

1. An EMC cake multi-pole plunger injection molding special machine, comprising a fully enclosed mold locking unit (2), an injection unit (4) and a mold plate assembly (8), characterized in that: The injection unit (4) comprises an injection unit (9) and a feeding unit (10), the injection unit (9) is provided with a plurality of independent plunger heads (93-2) in a central avoidance structure, and the feeding unit (10) is provided with a plurality of material chambers (96-1) for independent feeding of each pole.

2. The EMC cake multi-pole plunger injection special machine according to claim 1, characterized in that: A plurality of multi-pole runner plates (90) are further arranged to flow along the line, the multi-pole runner plate (90) is arranged on the upper end surface of the rotor to be injected and enters and exits the injection molding machine together with the complete rotor to be injected.

3. The EMC cake multi-pole plunger injection special machine according to claim 2, characterized in that: The multi-pole runner plate (90) is provided with a plurality of multi-pole runners (90-1), each pole runner forms a pole glue inlet (20), and a plurality of feeding points (90-2) are arranged in each pole runner to realize multi-point injection molding; a runner plate shaft hole (90-4) is arranged at the center position of the multi-pole runner plate (90).

4. The EMC cake multi-pole plunger injection molding machine according to any one of claims 1 to 3, characterized in that: The multi-pole material chamber (96-1) is arranged on a material cup device (96), the center of the material cup device (96) is provided with a shaft hole (96-3), the multi-pole material chamber (96-1) is arranged around the shaft hole (96-3), and the material cup temperature sensor (96-2) is arranged on the material cup device (96).

5. The EMC cake multi-pole plunger injection molding machine according to any one of claims 1 to 3, characterized in that: The injection unit (9) adopts an electric injection unit, the electric injection unit comprises a shooting cylinder assembly (91), a seat cylinder assembly (92) and an injection head assembly (93) connected with the shooting cylinder assembly (91) and provided with the multi-pole independent plunger head (93-2); the shooting cylinder assembly (91) is a ball screw assembly, comprising a ball screw (91-1) and a screw sleeve (91-2) arranged outside the ball screw (91-1), the injection head assembly (93) is connected with the ball screw (91-1) through an injection head flange (94) and driven to move up and down through the ball screw (91-1).

6. The EMC cake multi-plunger injection molding machine according to any one of claims 1 to 3, characterized in that: The injection unit (9) adopts a hydraulic injection unit, the hydraulic injection unit comprises a hydraulic shooting cylinder assembly (91) and an injection head assembly (93) connected with the shooting cylinder assembly (91) and provided with the multi-pole independent plunger head (93-2); the hydraulic injection cylinder assembly comprises an injection cylinder body (9-3) and an injection rod (9-4), the injection head assembly (93) is connected with the injection rod (9-4) through an injection head flange (94) and driven to move up and down through the injection rod (9-4).

7. The EMC cake multi-piston plunger injection unit machine according to any one of claims 1 to 3, characterized in that: The injection unit (9) is further provided with an injection head heating device (95), and the injection head heating device (95) is provided with a plurality of heating work position holes (95-1) corresponding to the multi-pole independent plunger head (93-2).

8. The EMC cake multi-plunger injection molding machine according to any one of claims 1 to 3, characterized in that: A heat preservation mold tool (97) is further included, and the heat preservation mold tool (97) comprises an upper heat preservation tool (98) and a lower heat preservation tool (99).

9. The EMC cake multi-piston plunger injection unit machine of claim 8, wherein: The upper heat preservation tool (98) comprises a cake shooting device (98-1) and an upper heat preservation tool heating temperature control device (98-2), the center of the cake shooting device (98-1) is provided with a center empty hole (98-3), and the cake shooting device (98-1) is provided with a multi-pole shooting hole (98-4) corresponding to a multi-pole independent plunger head (93-2).

10. The EMC cake multi-piston plunger injection unit machine of claim 8, wherein: The lower heat preservation tool (99) comprises a to-be-injection-molded part positioning-to-position detection device (99-1), a bottom die (99-4) and a lower heat preservation tool heating temperature control device (99-2); the lower heat preservation tool heating temperature control device (99-2) is provided with a to-be-injection-molded workpiece upper loading position (99-3), the to-be-injection-molded workpiece upper loading position (99-3) is provided with a lower tool shaft hole (99-5), and the bottom die (99-4) is arranged on the lower heat preservation tool heating temperature control device (99-2).

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