An electric melt adhesive structure of an injection molding machine

Abstract

The invention discloses an electric melt adhesive structure of an injection molding machine, comprising a plasticizing screw, a pre-plasticizing seat, a servo motor and a reducer, wherein the servo motor comprises a motor housing, a stator and a rotor, and is characterized in that the front end of the motor output shaft is coaxially recessed and provided with a mounting cavity matched with the reducer input shaft, the reducer input shaft is tightly mounted in the mounting cavity, and the rotor comprises a rotor core, and the axial length of the rotor core is less than the outer diameter of the rotor core. The advantages are simple and compact structure, energy saving and high efficiency.

Description

Technical Field

[0001] The invention relates to the field of injection molding machines, in particular to an electric melt adhesive structure of an injection molding machine. Background Art

[0002] At present, there are mainly the following ways to melt the pre-plasticized glue for injection molding machines: the first one is to use a hydraulic motor to drive the plasticizing screw to rotate for melting action. Its working principle is that the servo motor drives the hydraulic oil pump, the hydraulic oil pump drives the hydraulic motor, and the hydraulic motor drives the plasticizing screw to rotate to provide torque. After multiple conversions, the final conversion efficiency is only about 69%-75%. Then according to the working conditions of the injection molding machine, the system pressure is usually around 12MPA during melting, and the maximum speed of the servo pump is usually 2100 rpm (conversion process during melting action: servo motor-hydraulic pump-hydraulic pipeline-hydraulic valve plate-hydraulic valve-hydraulic pipeline-hydraulic motor). According to this working condition, the efficiency of the general servo motor is 93%-95%, the efficiency of the oil pump is about 89%-92%, the efficiency of the hydraulic pipeline is 98%-99%, the efficiency of the hydraulic valve plate valve is 98%-99%, the efficiency of the hydraulic pipeline is 98%-99%, the efficiency of the hydraulic motor is about 88%-90%, and the overall efficiency is about 70%. This method has a low overall efficiency due to multiple conversions. The second method is to use a motor to directly drive the plasticizing screw to rotate for melting the glue. This method requires a large motor torque, and the large-torque motors currently on the market are generally large in size and need to be equipped with a high-power driver, and the overall cost is very high. The third method is to use a standard servo motor with a traditional reduction gearbox to drive the plasticizing screw. The traditional reduction gearbox is not compatible with the standard servo motor at the connection, so it is necessary to use an additional transition flange and a coupling to connect to the standard servo motor, so that a servo motor with a small torque can be selected. This standard servo motor is usually much smaller than a hydraulic motor in size, but has a longer axial length. The reduction gearbox is installed with the transition flange and the coupling and the servo motor, and then the plasticizing screw is connected to form an electric melt structure. It has a large weight and a long axial length, which can easily cause the rear end of the screw pre-plastic seat to sag and cause the screw to be eccentric. At this time, it is necessary to provide corresponding support for the motor to avoid the problem of screw eccentricity. This requires increasing the length of the machine base to support the motor, which increases the manufacturing cost of the injection molding machine to a certain extent. At the same time, it also greatly increases the axial size of the entire machine, and requires a plant with a large placement space, which is not conducive to the control of manufacturing costs.

[0003] Based on this, how to achieve effective energy saving in the pre-plasticizing and melting action of the injection molding machine without increasing equipment costs, making major changes to the injection molding machine and ensuring the operational stability of the injection molding machine has become an urgent problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an electric melt adhesive structure of an injection molding machine which is simple in structure, compact, energy-efficient and cost-controlled.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] An electric melt adhesive structure of an injection molding machine, comprising a plasticizing component and a driving mechanism, wherein the plasticizing component comprises a plasticizing screw and a pre-plasticizing seat, wherein the pre-plasticizing seat is arranged on a frame of the injection molding machine, wherein a transmission shaft is rotatably arranged in the pre-plasticizing seat, wherein the rear end of the plasticizing screw is coaxially fixedly connected with the front end of the transmission shaft, wherein the driving mechanism comprises a servo motor and a reducer, wherein the servo motor comprises a motor housing, a stator and a rotor, wherein the stator is fixed in the motor housing, wherein a motor output shaft is coaxially fixedly arranged in the rotor, and wherein the rotor is connected to the motor output shaft by the motor output shaft. The output shaft is rotatably supported in the stator, the reducer comprises a reducer input shaft and a reducer output shaft, a reduction mechanism is arranged between the reducer input shaft and the reducer output shaft, the reducer output shaft is coaxially fixedly connected with the rear end of the transmission shaft; the front end of the motor output shaft is coaxially recessed backward to be provided with a mounting cavity matched with the reducer input shaft, the reducer input shaft is tightly mounted in the mounting cavity, the rotor comprises a rotor core, and the axial length of the rotor core is less than the outer diameter of the rotor core.

[0007] A plurality of groups of V-shaped permanent magnetic steel sheet groups are evenly embedded in the rotor core around the central axis of the rotor core, the V-shaped opening of the permanent magnetic steel sheet group faces the outer circle of the rotor core, and the V-shaped tip of the permanent magnetic steel sheet group faces the center of the rotor core. Each group of the permanent magnetic steel sheet group consists of two permanent magnetic steel sheets that are not in contact with each other. The magnetic poles of the opposite ends of the two permanent magnetic steel sheets in the same permanent magnetic steel sheet group are the same, and the magnetic poles of the opposite ends of the two adjacent permanent magnetic steel sheet groups are opposite, so that a magnetic field is formed in each group of the permanent magnetic steel sheet group, and the magnetic poles of the magnetic field formed by the two adjacent groups of the permanent magnetic steel sheet groups are opposite; there is a magnetic isolation element between the two adjacent groups of the permanent magnetic steel sheet groups; the degree of the internal angle formed by the opposite end faces of the two permanent magnetic steel sheets in each group of the permanent magnetic steel sheet group is 70°. As the length of the rotor is reduced, it will have a certain impact on the magnetic density. At this time, by increasing the diameter of the rotor and combining multiple groups of permanent magnet steel sheets with an internal angle of 70°, the magnetic density can be increased, thereby achieving an increase in the overall magnetic field strength, which effectively improves the efficiency of the motor, saves energy and is highly efficient.

[0008] The ratio of the axial length of the rotor core to the outer diameter of the rotor core is 0.6:1-1:1. Within this range, the arrangement of the permanent magnet steel sheet group can effectively improve the magnetic density, thereby effectively improving the overall magnetic field strength, and further effectively improving the efficiency of the motor.

[0009] The motor housing comprises an outer cylinder having a through cavity extending from front to back, the rear cover of the outer cylinder is provided with a motor rear end cover, the front cover of the outer cylinder is provided with a motor front end cover, the stator is fixedly installed in the outer cylinder, and the front end of the motor output shaft extends from the motor front end cover and is arranged outside the outer cylinder. The motor housing has a simple structure, consisting of the outer cylinder, the motor front end cover and the motor rear end cover, which facilitates the assembly of the stator, the rotor and other parts.

[0010] A spiral cooling channel surrounding the outer cylinder is arranged in the outer cylinder, and the outer cylinder has a cooling inlet connected to the spiral cooling channel for external liquid cooling medium to enter and a cooling outlet for the liquid cooling medium entering the spiral cooling channel to take away heat through heat exchange and flow out. A spiral cooling channel surrounding the outer cylinder is arranged in the outer cylinder, and a cooling inlet and a cooling outlet connected to the spiral cooling channel are arranged on the motor housing. The external liquid cooling medium can enter the spiral cooling channel through the cooling inlet and flow in the spiral cooling channel, and help the motor dissipate heat through heat exchange. After the heat exchange is completed, it flows out from the cooling outlet, thereby helping the servo motor to dissipate heat efficiently and helping to extend the service life of the servo motor.

[0011] The reducer comprises a reducer housing, the reducer housing comprises an inner gear ring which passes through from front to back, the front end cover of the inner gear ring is provided with a reducer front end cover, the rear end cover of the inner gear ring is provided with a reducer rear end cover, the reducer rear end cover is fixedly arranged at the front end of the motor front end cover, the front end of the reducer output shaft extends out of the reducer front end cover and is coaxially fixedly connected with the rear end of the transmission shaft, the front end of the motor output shaft extends into the reducer rear end cover and is coaxially fixedly connected with the reducer input shaft; the reducer housing has a simple structure, wherein the inner gear ring not only plays the role of housing closure, but also cooperates with the speed reduction mechanism to assume the function of speed regulation;

[0012] The reduction mechanism comprises a planet carrier, a sun gear and three planetary gears, wherein the planet carrier is coaxially rotatably mounted inside the inner gear ring, the three planetary gears are rotatably mounted on the planet carrier respectively, each of the planetary gears is meshedly connected with the inner gear ring, the sun gear is coaxially fixedly connected with the reducer input shaft, the sun gear is located between the three planetary gears and meshedly connected with each of the planetary gears. The reduction mechanism has a simple structure and is stable in use.

[0013] The reducer comprises a reducer housing, the reducer housing comprises an inner gear ring which passes through from front to back, a front end cover of the inner gear ring is provided with a reducer front end cover, a front end face of the motor front end cover is protruded forward and is provided with a positioning mounting ring which matches the inner gear ring, the positioning mounting ring extends into the inner gear ring and is connected to the inner gear ring, the reducer output shaft extends out of the reducer front end cover and is coaxially fixedly connected with the rear end of the transmission shaft, and the motor output shaft extends out of the motor front end cover and is coaxially fixedly connected with the reducer input shaft; the reducer housing has a simple structure, and the inner gear ring not only plays the role of sealing the reducer housing, but also cooperates with the speed regulating gear mechanism to assume the speed regulating function; and the above structure realizes that the reducer and the servo motor can share the motor front end cover to realize an integrated design, thereby further reducing the overall axial length and saving the overall manufacturing cost;

[0014] The reduction mechanism comprises a planet carrier, a sun gear and three planetary gears, wherein the planet carrier is coaxially rotatably mounted inside the inner gear ring, the three planetary gears are rotatably mounted on the planet carrier respectively, each of the planetary gears is meshedly connected with the inner gear ring, the sun gear is coaxially fixedly connected with the reducer input shaft, the sun gear is located between the three planetary gears and meshedly connected with each of the planetary gears. The reduction mechanism has a simple structure and is stable in use.

[0015] The planet carrier includes a driving ring, which is coaxially rotatably mounted in the inner gear ring, a front cover plate is provided at the front end of the driving ring, the output shaft of the reducer is fixedly mounted on the front cover plate, and a ring-shaped rear cover plate is provided at the rear end of the driving ring. The sun gear extends into the rear cover plate and is arranged between the three planetary gears. The side of the driving ring is provided with an opening for the planetary gear to be exposed and meshed with the inner gear ring. The planetary gear is rotatably mounted on the planet carrier through a planetary shaft, and the planetary shaft is fixedly mounted between the front cover plate and the rear cover plate. The planet carrier has a simple structure and realizes the stable and rotatable installation of the planetary gear thereon.

[0016] The grade of the permanent magnetic steel sheet is N45 or N48, so as to further improve the magnetic density.

[0017] The outside of the reducer input shaft is provided with anti-skid convex ribs, and the anti-skid convex ribs are tightly matched with the inner wall of the mounting cavity, so as to realize the stable coaxial fixed connection between the motor output shaft and the reducer input shaft, and further improve the magnetic density.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The structure is simple and compact. Under the premise of the same torque, by designing the axial length of the rotor core of the servo motor to be smaller than the outer diameter of the rotor core, the entire motor can be made into a structure with a small length and a large width and height, so that its outer dimensions are similar to those of the hydraulic motor used in the original injection molding machine, while its axial length is much smaller than the axial length of the traditional servo motor. Applying a motor of this structure and size to the melt mechanism of the injection molding machine will not significantly increase the length of the rear end of the screw, and the space used to install the hydraulic motor on the original injection molding machine can be fully used to install the motor of this structure. The motor can be stably supported by the frame of the original injection molding machine, and the motor can stably drive the screw without making any adjustments to other parts of the original injection molding machine. It is suitable for the transformation of old machines at a low cost, and there is no need to add additional support structures in the manufacture of new machines, which effectively saves costs;

[0020] (2) A mounting cavity matching the output shaft of the reducer is provided on the motor output shaft, which reasonably utilizes the assembly space of the motor output shaft. The mounting cavity is used to accommodate part of the output shaft of the reducer, and the coaxial assembly between the motor output shaft and the reducer input shaft is realized without the need for additional connecting parts, thereby further reducing the axial size of the entire drive mechanism;

[0021] (3) Under the same working conditions, the drive solution of the melt structure using a servo motor and a reducer can save at least 18% more energy on the whole machine than the traditional hydraulic motor drive;

[0022] (4) Since the pre-plasticization part is driven by an independent servo motor, it can achieve synchronous action of melting glue and opening mold, thereby improving machine efficiency. Especially for thin-walled products with cooling time less than melting time, it can achieve melting glue while opening mold, effectively improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional structural schematic diagram of the first embodiment of the present invention;

[0024] Figure 2 is a schematic cross-sectional structural diagram of a driving mechanism in Embodiment 1 of the present invention;

[0025] Figure 3It is a structural schematic diagram of the servo motor in the present invention;

[0026] Figure 4 It is a schematic cross-sectional structure diagram of a rotor with a motor output shaft in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the rotor in the present invention;

[0028] Figure 6 It is a schematic cross-sectional structural diagram of a reducer in Embodiment 1 of the present invention;

[0029] Figure 7 It is a schematic diagram of the overall structure of the speed reduction mechanism in the present invention;

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the planet carrier in the present invention;

[0031] Fig. 9 It is a schematic cross-sectional structural diagram of the driving mechanism in the second embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1: As shown in the figure, an electric melt adhesive structure of an injection molding machine includes a plasticizing component and a driving mechanism. The plasticizing component includes a plasticizing screw 1 and a pre-plasticizing seat 2. The pre-plasticizing seat 2 is arranged on the frame of the injection molding machine. A transmission shaft 21 is rotatably arranged in the pre-plasticizing seat 2. The rear end of the plasticizing screw 1 is coaxially fixedly connected with the front end of the transmission shaft 21. The driving mechanism includes a servo motor A and a reducer B. The servo motor A includes a motor housing, a stator A1 and a rotor. The stator A1 is fixed in the motor housing. A motor output shaft A3 is coaxially fixedly arranged in the rotor. The rotor is connected to the motor output shaft A3 through the motor output shaft A3. The reducer B is rotatably supported in the stator A1. The reducer B comprises a reducer input shaft B1 and a reducer output shaft B2. A reduction mechanism is arranged between the reducer input shaft B1 and the reducer output shaft B2. The reducer output shaft B2 is coaxially fixedly connected with the rear end of the transmission shaft 21. The front end of the motor output shaft A3 is coaxially recessed backward to be provided with a mounting cavity A31 for mounting the reducer input shaft B1. The reducer input shaft B1 is tightly mounted in the mounting cavity A31. The rotor comprises a rotor core A2. The axial length L of the rotor core A2 is smaller than the outer diameter D of the rotor core A2.

[0034] In this specific embodiment, a plurality of groups of V-shaped permanent magnetic steel sheet groups A4 are evenly distributed and embedded in the rotor core A2 around the central axis of the rotor core A2, the V-shaped openings B64 of the permanent magnetic steel sheet groups A4 face the outer circle of the rotor core A2, and the V-shaped tips of the permanent magnetic steel sheet groups A4 face the center of the rotor core A2. Each group of permanent magnetic steel sheet groups A4 is composed of two permanent magnetic steel sheets A41 that are not in contact with each other. The two permanent magnetic steel sheets A41 in the same permanent magnetic steel sheet group A4 The magnetic poles at the opposite ends are the same, and the magnetic poles at the opposite ends of two adjacent permanent magnetic steel sheets A41 in two adjacent groups of permanent magnetic steel sheets A4 are opposite, so that a magnetic field is formed in each group of permanent magnetic steel sheets A4, and the magnetic poles of the magnetic field formed by the two adjacent groups of permanent magnetic steel sheets A4 are opposite; there is a magnetic isolation element A5 between the two adjacent groups of permanent magnetic steel sheets A4; the degree α of the internal angle formed by the opposite end faces of the two permanent magnetic steel sheets A41 in each group of permanent magnetic steel sheets A4 is 70°.

[0035] In this specific embodiment, the ratio of the axial length L of the rotor core A2 to the outer diameter D of the rotor core A2 is 0.6:1-1:1. Within this range, in conjunction with the arrangement of the permanent magnet steel sheet group A4, the magnetic density can be effectively improved, thereby effectively improving the overall magnetic field strength, and further effectively improving the efficiency of the motor.

[0036] In this specific embodiment, the motor housing includes an outer cylinder A6 having a through cavity extending from front to back, a motor rear end cover A7 is provided at the rear cover of the outer cylinder A6, a motor front end cover A8 is provided at the front cover of the outer cylinder A6, a stator A1 is fixedly installed in the outer cylinder A6, and a front end of the motor output shaft A3 extends from the motor front end cover A8 and is provided outside the outer cylinder A6. The motor housing has a simple structure, consisting of the outer cylinder A6, the motor front end cover A8 and the motor rear end cover A7, which facilitates the assembly of the stator A1, the rotor and other parts.

[0037] In this specific embodiment, a spiral cooling channel A61 surrounding the outer cylinder A6 is provided in the outer cylinder A6, and the outer cylinder A6 has a cooling inlet A62 connected to the spiral cooling channel A61 for external liquid cooling medium to enter, and a cooling outlet A63 for the liquid cooling medium entering the spiral cooling channel A61 to take away heat through heat exchange and flow out to the outside. A spiral cooling channel A61 surrounding the outer cylinder A6 is provided in the outer cylinder A6, and a cooling inlet A62 and a cooling outlet A63 connected to the spiral cooling channel A61 are provided on the motor housing. The external liquid cooling medium can enter the spiral cooling channel A61 through the cooling inlet A62 and flow in the spiral cooling channel A61, helping the motor to dissipate heat through heat exchange, and flow out from the cooling outlet A63 after the heat exchange is completed, thereby helping the servo motor A to dissipate heat efficiently and helping to extend the service life of the servo motor A.

[0038] In this specific embodiment, the reducer B includes a reducer housing, the reducer housing includes an inner gear ring B3 that passes through from front to back, the front end cover of the inner gear ring B3 is provided with a reducer front end cover B4, the rear end cover of the inner gear ring B3 is provided with a reducer rear end cover B5, the reducer rear end cover B5 is fixedly arranged at the front end of the motor front end cover A8, the front end of the reducer output shaft B2 extends out of the reducer front end cover B4 and is coaxially fixedly connected to the rear end of the transmission shaft 21, and the front end of the motor output shaft A3 extends into the reducer rear end cover B5 and is coaxially fixedly connected to the reducer input shaft B1. The above reducer housing has a simple structure, wherein the inner gear ring B3 not only plays the role of housing closure, but also cooperates with the speed reduction mechanism to assume the function of speed regulation.

[0039] In this specific embodiment, the reduction mechanism includes a planet carrier B6, a sun gear B7 and three planet gears B8, the planet carrier B6 is coaxially rotatably mounted inside the inner gear ring B3, the three planet gears B8 are rotatably mounted on the planet carrier B6, each planet gear B8 is meshed with the inner gear ring B3, the sun gear B7 is coaxially fixedly connected to the reducer input shaft B1, and the sun gear B7 is located between the three planet gears B8 and meshed with each planet gear B8. The above reduction mechanism has a simple structure, stable use, and can effectively improve efficiency.

[0040] In this specific embodiment, the planet carrier B6 includes a drive ring B61, which is coaxially rotatably mounted in the inner gear ring B3, a front cover plate B62 is provided at the front end of the drive ring B61, the reducer output shaft B2 is fixedly mounted on the front cover plate B62, a ring-shaped rear cover plate B63 is provided at the rear end of the drive ring B61, the sun gear B7 extends into the rear cover plate B63 and is arranged between the three planetary gears B8, the side of the drive ring B61 ​​is provided with an opening B64 for the planetary gear B8 to be exposed and meshed with the inner gear ring B3, the planetary gear B8 is rotatably mounted on the planet carrier B6 through the planetary shaft B81, and the planetary shaft B81 is fixedly mounted between the front cover plate B62 and the rear cover plate B63. The above-mentioned planet carrier B6 has a simple structure and realizes the stable and rotatable installation of the planetary gear B8 thereon.

[0041] In this specific embodiment, the planet shaft B81 and the planet wheel B8 are rotatably connected via a bearing Z. The structure is simple and ensures stable operation.

[0042] In this specific embodiment, the rear end of the drive ring B61 ​​is rotatably mounted in the rear end cover via a bearing Z, and the front end of the drive ring B61 ​​is rotatably mounted in the front end cover via a bearing Z. This realizes the stable rotatable installation of the planet carrier B6 in the J reducer housing.

[0043] In this specific embodiment, the grade of the permanent magnetic steel sheet A41 is N45 or N48, so as to further improve the magnetic density.

[0044] In this specific embodiment, the outside of the reducer input shaft B1 is provided with anti-skid ribs B11, which are tightly matched with the inner wall of the mounting cavity A31, so as to realize a stable coaxial fixed connection between the motor output shaft A3 and the reducer input shaft B1, and further improve the magnetic density.

[0045] Embodiment 2: The other parts are the same as Embodiment 1, except that the reducer B includes a reducer housing, the reducer housing includes an inner gear ring B3 that passes through from front to back, the front end cover of the inner gear ring B3 is provided with a reducer front end cover B4, the front end of the motor front end cover A8 is provided with a positioning and mounting ring A81 that matches the inner gear ring B3, the positioning and mounting ring A81 extends into the inner gear ring B3 and is connected to the inner gear ring B3, the reducer output shaft B2 extends out of the reducer front end cover B4 and is coaxially fixedly connected to the rear end of the transmission shaft 21, and the motor output shaft A3 extends out of the motor front end cover A8 and is coaxially fixedly connected to the reducer input shaft B1. The above reducer housing has a simple structure, the inner gear ring B3 not only plays the role of sealing the reducer housing, but also cooperates with the speed regulating gear mechanism to assume the function of speed regulation; and the above structure realizes that the reducer B and the servo motor A can share the motor front end cover A8 to realize an integrated design, thereby further reducing the overall length in the axial direction and saving the overall manufacturing cost.

[0046] In this specific embodiment, the reduction mechanism includes a planet carrier B6, a sun gear B7 and three planet gears B8, the planet carrier B6 is coaxially rotatably mounted inside the inner gear ring B3, the three planet gears B8 are rotatably mounted on the planet carrier B6, each planet gear B8 is meshed with the inner gear ring B3, the sun gear B7 is coaxially fixedly connected to the reducer input shaft B1, and the sun gear B7 is located between the three planet gears B8 and meshed with each planet gear B8. The above reduction mechanism has a simple structure and is stable in use.

Claims

1. An electric melt structure of an injection molding machine, comprising a plasticizing component and a driving mechanism, wherein the plasticizing component comprises a plasticizing screw and a pre-plasticizing seat, the pre-plasticizing seat is arranged on the frame of the injection molding machine, a transmission shaft is rotatably arranged in the pre-plasticizing seat, the rear end of the plasticizing screw is coaxially fixedly connected with the front end of the transmission shaft, the driving mechanism comprises a servo motor and a reducer, the servo motor comprises a motor housing, a stator and a rotor, the stator is fixed in the motor housing, a motor output shaft is coaxially fixedly arranged in the rotor, the rotor is rotatably supported in the stator through the motor output shaft, the reducer has a reducer input shaft and a reducer output shaft, a reduction mechanism is arranged between the reducer input shaft and the reducer output shaft, and the reducer output shaft is coaxially fixedly connected with the rear end of the transmission shaft; it is characterized in that The front end of the motor output shaft is coaxially recessed and provided with a mounting cavity matched with the reducer input shaft, and the reducer input shaft is tightly mounted in the mounting cavity. The rotor includes a rotor core, and the axial length of the rotor core is smaller than the outer diameter of the rotor core. A plurality of groups of V-shaped permanent magnetic steel sheet groups are evenly embedded in the rotor core around the central axis of the rotor core, the V-shaped openings of the permanent magnetic steel sheet groups face the outer circle of the rotor core, and the V-shaped tips of the permanent magnetic steel sheet groups face the center of the rotor core, each group of the permanent magnetic steel sheet groups is composed of two permanent magnetic steel sheets that are not in contact with each other, the magnetic poles of the opposite ends of the two permanent magnetic steel sheets in the same permanent magnetic steel sheet group are the same, and the magnetic poles of the opposite ends of the two adjacent permanent magnetic steel sheet groups are opposite, so that a magnetic field is formed in each group of the permanent magnetic steel sheet groups, and the magnetic poles of the magnetic fields formed by the two adjacent groups of the permanent magnetic steel sheet groups are opposite; There is a magnetic isolation element between two adjacent groups of permanent magnetic steel sheets; the degree of the internal angle formed by the opposite end faces of the two permanent magnetic steel sheets in each group of permanent magnetic steel sheets is 70°; The ratio of the axial length of the rotor core to the outer diameter of the rotor core is 0.6:1-1:

1.

2. An electric melt adhesive structure for an injection molding machine as claimed in claim 1, characterized in that The motor housing includes an outer cylinder having a through cavity extending from front to back, the rear cover of the outer cylinder is provided with a motor rear end cover, the front cover of the outer cylinder is provided with a motor front end cover, the stator is fixedly installed in the outer cylinder, and the front end of the motor output shaft extends from the motor front end cover and is arranged outside the outer cylinder.

3. An electric melt adhesive structure for an injection molding machine as claimed in claim 2, characterized in that The outer cylinder is provided with a spiral cooling channel surrounding the outer cylinder, and the outer cylinder has a cooling inlet connected to the spiral cooling channel for external liquid cooling medium to enter and a cooling outlet for the liquid cooling medium entering the spiral cooling channel to take away heat through heat exchange and flow out.

4. An electric melt adhesive structure for an injection molding machine as claimed in claim 2, characterized in that The reducer comprises a reducer housing, the reducer housing comprises an inner gear ring which passes through from front to back, the front end cover of the inner gear ring is provided with a reducer front end cover, the rear end cover of the inner gear ring is provided with a reducer rear end cover, the reducer rear end cover is fixedly arranged at the front end of the motor front end cover, the front end of the reducer output shaft extends out of the reducer front end cover and is coaxially fixedly connected with the rear end of the transmission shaft, the front end of the motor output shaft extends into the reducer rear end cover and is coaxially fixedly connected with the reducer input shaft; The reduction mechanism includes a planet carrier, a sun gear and three planetary gears. The planet carrier is coaxially and rotatably mounted inside the inner gear ring. The three planetary gears are respectively rotatably mounted on the planet carrier. Each of the planetary gears is meshingly connected with the inner gear ring. The sun gear is coaxially and fixedly connected with the reducer input shaft. The sun gear is located between the three planetary gears and is meshingly connected with each of the planetary gears.

5. The electric melt adhesive structure of an injection molding machine as claimed in claim 2, characterized in that The reducer comprises a reducer housing, the reducer housing comprises an inner gear ring which passes through from front to back, the front end cover of the inner gear ring is provided with a reducer front end cover, the front end surface of the motor front end cover is protruding forward and provided with a positioning mounting ring which matches the inner gear ring, the positioning mounting ring extends into the inner gear ring and is connected with the inner gear ring, the reducer output shaft extends out of the reducer front end cover and is coaxially fixedly connected with the rear end of the transmission shaft, and the motor output shaft extends out of the motor front end cover and is coaxially fixedly connected with the reducer input shaft; The reduction mechanism includes a planet carrier, a sun gear and three planetary gears. The planet carrier is coaxially and rotatably mounted inside the inner gear ring. The three planetary gears are respectively rotatably mounted on the planet carrier. Each of the planetary gears is meshingly connected with the inner gear ring. The sun gear is coaxially and fixedly connected with the reducer input shaft. The sun gear is located between the three planetary gears and is meshingly connected with each of the planetary gears.

6. An electric melt adhesive structure for an injection molding machine as claimed in claim 4 or 5, characterized in that The planetary carrier includes a driving ring, which is coaxially and rotatably mounted in the inner gear ring. A front cover plate is provided at the front end of the driving ring, and the output shaft of the reducer is fixedly mounted on the front cover plate. An annular rear cover plate is provided at the rear end of the driving ring. The sun gear extends into the rear cover plate and is arranged between the three planetary gears. An opening is provided on the side of the driving ring for exposing the planetary gears and meshing with the inner gear ring. The planetary gears are rotatably mounted on the planetary carrier through planetary shafts, and the planetary shafts are fixedly mounted between the front cover plate and the rear cover plate.

7. The electric melt adhesive structure of an injection molding machine as claimed in claim 1, characterized in that The grade of the permanent magnetic steel sheet is N45 or N48.

8. The electric melt adhesive structure of an injection molding machine as claimed in claim 1, characterized in that The outside of the reducer input shaft is provided with anti-skid convex ribs, and the anti-skid convex ribs are tightly matched with the inner wall of the installation cavity.

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