Pre-plasticizing mechanism and injection molding machine

Abstract

The utility model discloses a pre-plasticizing mechanism of an injection molding machine and the injection molding machine. The pre-plasticizing mechanism comprises a driving motor and a speed reducer, the driving motor comprises a motor shell, a motor rotor and a motor stator, the motor stator is arranged on the motor shell, and the motor stator is rotationally connected with the motor rotor; the speed reducer comprises a speed reducer body and a transmission shaft, the transmission shaft is sleeved with the speed reducer body and is in transmission fit with the speed reducer body, one end of the transmission shaft is fixedly connected with the motor rotor, and the other end of the transmission shaft is used for being connected with a pre-plasticizing screw of the injection molding machine; the transmission shaft is of an integrated structure. According to the scheme, the problem that the reliability and safety of the pre-plasticizing mechanism are poor can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine preplastic technology field especially, a kind of preplastic mechanism and injection molding machine. BACKGROUND

[0002] Injection molding machine is a kind of thermoplastic or thermosetting plastic is made into various shapes of plastic products using plastic molding die processing equipment. Injection molding machine includes injection molding mechanism and mold mechanism, and plastic needs to be preplastic in injection molding mechanism, and then the molten plastic is pushed into closed mold by injection molding mechanism, and the shape given by mold cavity is formed after cooling and solidification. After adding plastic, the injection molding mechanism first needs to preplastic, which is a preparation for the next injection after injection molding machine injection.

[0003] In the related art, the preplastic mechanism in injection molding machine includes driving motor, speed reducer and power output shaft, the driving shaft of driving motor is connected with power output shaft through speed reducer, and power output shaft is used to be connected with preplastic screw of injection molding machine. At this time, the driving shaft of driving motor drives power output shaft to rotate through speed reducer, and then drives preplastic screw to rotate, so as to accelerate plastic melting.

[0004] However, it is difficult to realize coaxial installation between the driving shaft of driving motor and power output shaft, so that there is a certain error between the driving shaft of driving motor and power output shaft, so as to cause power output shaft to eccentric rotate to a large extent, and then cause preplastic mechanism to vibrate greatly, so that the reliability and safety of preplastic mechanism are poor. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of preplastic mechanism and injection molding machine to solve the problem that the reliability and safety of preplastic mechanism are poor.

[0006] To solve the above problems, the utility model adopts the following technical solutions:

[0007] A kind of preplastic mechanism of injection molding machine, comprising:

[0008] Driving motor, the driving motor includes motor housing, motor rotor and motor stator, the motor stator is arranged on the motor housing, and the motor stator is rotatably connected with the motor rotor;

[0009] Speed reducer, the speed reducer includes speed reducer body and transmission shaft, the speed reducer body is sleeved on the transmission shaft, and is drivingly cooperated with the transmission shaft, one end of the transmission shaft is fixedly connected with the motor rotor, and the other end of the transmission shaft is used to be connected with the preplastic screw of the injection molding machine;Wherein, the transmission shaft is one-piece structure.

[0010] A kind of injection molding machine, comprising the preplastic mechanism described above.

[0011] The technical scheme of the utility model can achieve the following beneficial effects:

[0012] The utility model discloses a preplastic mechanism, the one end of transmission shaft of speed reducer is connected with motor rotor of driving motor, and the other end of transmission shaft is used for connecting with the preplastic screw of injection molding machine. Meanwhile, transmission shaft is integral type structure. In this scheme, the power input of preplastic mechanism, speed reduction drive and power output adopt the same transmission shaft, therefore avoid the risk of the assembly error of different transmission shafts is big, therefore can reduce the vibration of preplastic mechanism, and then improve the reliability and security of preplastic mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are included to provide a further understanding of the utility model, form a part of the utility model and are incorporated herein to constitute a part of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations on the utility model. In the drawings:

[0014] Figure 1 It is the structure schematic view of preplastic mechanism disclosed by the utility model embodiment;

[0015] Figure 2 It is the side view of preplastic mechanism disclosed by the utility model embodiment;

[0016] Figure 3 It is the sectional view of preplastic mechanism disclosed by the utility model embodiment;

[0017] Figure 4 It is the sectional view of preplastic mechanism disclosed by the utility model embodiment;

[0018] Figure 5 It is the sectional view of transmission shaft of preplastic mechanism disclosed by the utility model embodiment;

[0019] Figure 6 It is the partial structure schematic view of injection molding machine disclosed by the utility model embodiment.

[0020] Mark explanation:

[0021] 100-preplastic mechanism, 110-driving motor, 111-motor housing, 111a-receiving groove, 112-motor rotor, 113-motor stator, 120-speed reducer, 121-speed reducer body, 1211-speed reducer shell, 1212-gear transmission assembly, 1212a-inner gear, 122-transmission shaft, 1221-first shaft section, 1221a-connection key, 1222-second shaft section, 1223-third shaft section, 1224-retainer, 1224a-first fixed disc, 1224b-second fixed disc, 1224c-supporting rib;

[0022] 200-injection molding mechanism, 210-mounting seat, 220-injection cylinder, 230-movable bracket, 240-guide rod, 250-guide rod fixing seat, 260-plasticizing assembly. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0024] The technical solutions disclosed in various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 5 As shown, the embodiment of the present invention discloses a pre-molding mechanism 100 of an injection molding machine, which is used to drive the pre-molding screw of the injection molding machine to rotate, thereby realizing the pre-molding operation of the injection molding machine. The disclosed pre-molding mechanism 100 includes a drive motor 110 and a reducer 120.

[0026] The drive motor 110 is the power output component of the pre-molding mechanism 100, providing the driving force for the rotation of the pre-molding screw. The drive motor 110 comprises a motor housing 111, a motor rotor 112, and a motor stator 113. The motor housing 111 provides a mounting base for the other components of the drive motor 110. The motor stator 113 is mounted on the motor housing 111 and is rotationally connected to the motor rotor 112. As is known in the art, the energized motor stator 113 (coil windings) generates a rotating magnetic field, which acts on the motor rotor 112 (magnets) to generate a magneto-electrodynamic torque. The specific driving principle and structure of the drive motor 110 are common knowledge and are not limited herein.

[0027] The reducer 120 is used to reduce the rotating speed of the motor rotor 112 of the driving motor 110, so as to input a suitable rotating speed to the pre-plastic screw. The reducer 120 comprises a reducer body 121 and a transmission shaft 122, and the reducer body 121 comprises but is not limited to a reducer shell 1211, a gear transmission assembly 1212 and the like. The reducer body 121 is sleeved on the transmission shaft 122 and is in transmission cooperation with the transmission shaft 122. Specifically, the gear transmission assembly 1212 can be located in the reducer shell 1211, the reducer shell 1211 can be sleeved on the transmission shaft 122, the transmission shaft 122 can rotate relative to the reducer shell 1211, and the gear transmission assembly 1212 can be in transmission cooperation with the transmission shaft 122. It can be understood that the transmission shaft 122 can rotate relative to the reducer shell 1211, and at the same time, in order to realize the reduction operation, the transmission shaft 122 is in transmission cooperation with the gear transmission assembly 1212.

[0028] One end of the transmission shaft 122 is fixedly connected with the motor rotor 112, and the other end of the transmission shaft 122 is used to be connected with the pre-plastic screw of the injection molding machine. The transmission shaft 122 is of an integral structure. The integral structure herein means that the transmission shaft 122 is integrally machined and manufactured, and the transmission shaft 122 is an integral machining product, and the parts of the transmission shaft 122 are not assembled. Alternatively, the transmission shaft 122 can be manufactured by using an integral injection molding process or can also be manufactured by using an integral machining process. Regardless of which process is used, as long as the transmission shaft 122 is integrally formed.

[0029] In the specific operation process, the motor rotor 112 of the driving motor 110 drives the transmission shaft 122 to rotate, the transmission shaft 122 is reduced by the gear transmission assembly 1212, and then the transmission shaft 122 outputs power, so as to drive the pre-plastic screw to rotate.

[0030] In the embodiment disclosed in the application, the transmission shaft 122 of the reducer 120 is directly connected with the motor rotor 112 and the pre-plastic screw, so that the power input, the reduction transmission and the power output of the pre-plastic mechanism 100 adopt the same transmission shaft 122, thereby avoiding the risk of large assembly error between different transmission shafts 122, so as to reduce the vibration of the pre-plastic mechanism 100, and further improve the reliability and safety of the pre-plastic mechanism 100.

[0031] In addition, the application can realize coaxial power input and power output, so as to effectively avoid the transmission error caused by different shafts, and further provide transmission efficiency.

[0032] In addition, the power input, the speed reduction transmission and the power output of the pre-plasticizing mechanism 100 in the present application adopt the same transmission shaft, so the connection structure between the driving shaft of the driving motor 110 and the power output shaft in the related art is omitted, thereby reducing the failure points, and the assembly length between the driving motor 110 and the speed reducer 120 is also reduced, so as to be more conducive to reducing the space occupancy of the pre-plasticizing mechanism 100, and to realize the miniaturization development of the pre-plasticizing mechanism 100.

[0033] In the above scheme, the motor housing 111 can include a cylinder, a first flange plate and a second flange plate, the first flange plate and the second flange plate respectively cover the openings at both ends of the cylinder, and the motor rotor 112 and the motor stator 113 are located in the space formed by the cylinder, the first flange plate and the second flange plate. The transmission shaft 122 penetrates the second flange plate and extends into the space, and is fixedly connected with the motor rotor 112. The second flange plate can be connected with the flange plate of the speed reducer housing 1211.

[0034] In another scheme, the motor housing 111 can be provided with a receiving groove 111a, the motor stator 113 and the motor rotor 112 are located in the receiving groove 111a, and the speed reducer housing 1211 can block the slot opening of the receiving groove 111a and is fixedly connected with the motor housing 111. At this time, it can be understood that the motor housing 111 is composed of the above-mentioned cylinder and the first flange plate, and the cylinder and the first flange plate enclose the receiving groove 111a, and the opening on the side of the cylinder away from the first flange plate is the slot opening of the receiving groove 111a. At this time, the housing of the speed reducer housing 1211 directly blocks the receiving groove 111a, which can be understood as that the flange plate of the speed reducer housing 1211 blocks the receiving groove 111a, so that the speed reducer housing 1211 and the electrode housing share one flange plate, and thus one flange plate of the motor housing 111 is saved.

[0035] In this scheme, the electrode housing can borrow a flange plate of the speed reducer housing 1211, so as to reduce the manufacturing cost of the pre-plasticizing mechanism 100. In addition, the stacking size between the motor housing 111 and the speed reducer housing 1211 is reduced by the width of one flange plate, so as to make the pre-plasticizing mechanism 100 more compact, and thus the space occupancy of the pre-plasticizing mechanism 100 can be further reduced.

[0036] In another optional embodiment, the transmission shaft 122 can include a first shaft segment 1221, a second shaft segment 1222 and a third shaft segment 1223 arranged in sequence along the axial direction, one end of the first shaft segment 1221 away from the second shaft segment 1222 can be fixedly connected with the motor rotor 112, and one end of the third shaft segment 1223 away from the second shaft segment 1222 can be connected with the pre-plasticizing screw. The surface of the second shaft segment 1222 is a toothed surface, and the second shaft segment 1222 is a gear shaft. The second shaft segment 1222 can be engaged with the gear transmission assembly 1212.

[0037] In this scheme, the part of the transmission shaft 122 matched with the gear transmission assembly 1212 is provided as a gear shaft, thereby simplifying the assembly structure of the transmission shaft 122 and the gear assembly, and reducing the assembly difficulty of the pre-molding structure.

[0038] In the above scheme, the speed reducer 120 can be a planetary gear speed reducer, and in this case, the gear transmission assembly 1212 can include an internal gear 1212a and a plurality of planetary gears. The internal gear 1212a can be fixedly arranged on the speed reducer housing 1211, and the plurality of planetary gears are spaced apart along the circumference of the second shaft segment 1222 and are all engaged with the second shaft segment 1222. The internal gear 1212a surrounds the plurality of planetary gears and is engaged with the plurality of planetary gears. In this case, the transmission shaft 122 can drive the planetary gears to rotate, and the planetary gears rotate relative to the internal gear 1212a. In this scheme, the planetary gear speed reducer 120 has the characteristic of small volume, thereby making the pre-molding mechanism 100 have a small volume, and the pre-molding mechanism 100 occupies a smaller installation space of the injection molding machine.

[0039] In another alternative scheme, the gear transmission assembly 1212 can further include a retainer 1224 rotatably arranged in the speed reducer housing 1211. The retainer 1224 is sleeved on the transmission shaft 122 and is in interference fit with the transmission shaft 122. The retainer 1224 here can be sleeved on any one or more of the first shaft segment 1221, the second shaft segment 1222, and the third shaft segment 1223. In this case, the retainer 1224 can rotate synchronously with the transmission shaft 122. Figure 5 The retainer 1224 and the transmission shaft 122 are in interference fit as a separate structure, not an integral structure. The plurality of planetary gears are rotatably arranged on the retainer 1224. In this scheme, the retainer 1224 is sleeved on the transmission shaft 122, thereby further simplifying the structure of the speed reducer 120.

[0040] The planetary gears in the above scheme can be rotatably connected with the retainer 1224 through a rotating shaft, a latch, or other structures, and other structures can also be used, which are not limited in this regard.

[0041] In another solution, the retainer 1224 can include a first fixed disc 1224a and a second fixed disc 1224b. The first fixed disc 1224a can be interference-fitted to one end of the first shaft segment 1221 towards the second shaft segment 1222. The second fixed disc 1224b can be interference-fitted to one end of the third shaft segment 1223 towards the second shaft segment 1222. The second shaft segment 1222 is located between the first fixed disc 1224a and the second fixed disc 1224b. The two ends of each planetary gear can be rotatably connected with the first fixed disc 1224a and the second fixed disc 1224b, respectively. This solution can improve the uniformity of support for the planetary gears, thereby having a better retaining effect.

[0042] Further, the retainer 1224 can further include a plurality of support ribs 1224c. The plurality of support ribs 1224c can be located between the first fixed disc 1224a and the second fixed disc 1224b and arranged along the circumference of the first fixed disc 1224a or the second fixed disc 1224b. One planetary gear can be arranged between any two adjacent support ribs 1224c.

[0043] In this solution, the support ribs 1224c can assist in supporting the first fixed disc 1224a and the second fixed disc 1224b, thereby avoiding deformation of the first fixed disc 1224a and the second fixed disc 1224b, and further improving the smoothness of operation of the planetary gears.

[0044] In order to facilitate the connection of the motor rotor 112 and the transmission shaft 122, in an optional solution, one of the first shaft segment 1221 and the motor rotor 112 can be provided with a connecting key 1221a, and the other can be provided with a matching key groove. The first shaft segment 1221 and the motor rotor 112 can be inserted and fitted through the connecting key 1221a and the matching key groove.

[0045] In this solution, the transmission shaft 122 and the motor rotor 112 are inserted and fitted, thereby simplifying the assembly mode of the driving motor 110 and the transmission shaft 122.

[0046] Alternatively, the connecting key 1221a can be at least one of a flat key, a half-round key, a wedge key, and a spline, and the structure of the matching key groove is matched with the structure of the connecting key 1221a groove.

[0047] In another optional solution, the third shaft segment 1223 can be a spline shaft. The spline shaft is inserted and fitted with the pre-plastic screw. At this time, one end of the pre-plastic screw is provided with a spline groove matched with the spline shaft, and the spline shaft is matched with the spline groove. In this solution, when the spline shaft is inserted into the matching spline groove, the connection between the transmission shaft 122 and the pre-plastic screw is achieved. Therefore, the assembly difficulty of the transmission shaft 122 and the pre-plastic screw is small.

[0048] In an optional solution, the reducer housing 1211 and the motor housing 111 can be set separately, that is, the reducer housing 1211 and the motor housing 111 are two independent components, and the reducer housing 1211 and the motor housing 111 can be connected by welding, riveting, threads and other connection methods.

[0049] In another embodiment, the reducer housing 1211 and the motor housing 111 are integrally formed. In this case, no assembly is required between the reducer housing 1211 and the motor housing 111. The reducer housing 1211 and the motor housing 111 can be manufactured using an integral casting process or an integral machining process. Regardless of the process used, the drive shaft 122 can be integrally formed. This solution can further simplify the assembly structure of the pre-molding mechanism 100.

[0050] Based on the pre-molding mechanism 100 disclosed in the embodiment of the present application, the embodiment of the present application further discloses an injection molding machine, and the disclosed injection molding machine includes the pre-molding mechanism 100 described in any of the above embodiments.

[0051] The injection molding machine disclosed in the present application further comprises an injection molding mechanism 200, which is used to melt plastic and inject the melted plastic into a mold. The pre-molding mechanism 100 is disposed on the injection molding mechanism 200, and the pre-molding mechanism 100 drives the pre-molding screw of the injection molding mechanism 200 to rotate.

[0052] like Figure 6 As shown, the injection molding mechanism 200 includes but is not limited to a mounting base 210, an injection cylinder 220, a movable bracket 230, a guide rod 240, a guide rod fixing base 250, and a plasticizing assembly 260. The mounting base 210 provides a mounting base for the other components of the injection molding mechanism 200, and the plasticizing assembly 260 and the injection cylinder 220 are fixedly mounted on the mounting base 210. The plasticizing assembly 260 includes an injection barrel and a pre-molding screw. The injection barrel can be used to fill plastic, and the pre-molding screw is located in the injection barrel. The driving end of the injection cylinder 220 is connected to the movable bracket 230, and the pre-molding mechanism 100 mentioned above can be fixed on the movable bracket 230. The guide rod fixing base 250 is used to fix the guide rod 240. The guide rod 240 is slidably connected to the movable bracket 230, and the guide rod 240 is used to guide the movable bracket 230.

[0053] During the specific working process, when the pre-molding mechanism 100 drives the pre-molding screw to complete pre-molding, the injection cylinder 220 drives the movable bracket 230 to move, thereby moving the pre-molding screw. The pre-molding screw can extrude the molten plastic out of the injection cylinder, allowing the molten plastic to enter the mold, thereby realizing the injection molding operation.

[0054] The different optimization features between the various embodiments can be combined to form a better embodiment as long as they are not contradictory.

[0055] The above is only an embodiment of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A preplasticating mechanism of an injection molding machine, characterized by, The utility model relates to a motor drive injection molding machine, including: A drive motor (110) includes a motor housing (111), a motor rotor (112) and a motor stator (113), the motor stator (113) is arranged on the motor housing (111), and the motor stator (113) is rotatably connected with the motor rotor (112); A speed reducer (120) includes a speed reducer body (121) and a transmission shaft (122), the speed reducer body (121) is sleeved on the transmission shaft (122) and is drivingly connected with the transmission shaft (122), one end of the transmission shaft (122) is fixedly connected with the motor rotor (112), and the other end of the transmission shaft (122) is used for being connected with a pre-plastic screw of the injection molding machine;Wherein, the transmission shaft (122) is an integral structure.

2. The preforming mechanism of claim 1, wherein The motor housing (111) is provided with a containing groove (111a), the motor stator (113) and the motor rotor (112) are located in the containing groove (111a), the speed reducer body (121) includes a speed reducer shell (1211) and a gear transmission assembly (1212), the gear transmission assembly (1212) is located in the speed reducer shell (1211), the speed reducer shell (1211) is sleeved on the transmission shaft (122), the transmission shaft (122) can rotate relative to the speed reducer shell (1211), the gear transmission assembly (1212) is drivingly connected with the transmission shaft (122), and the speed reducer shell (1211) blocks the slot opening of the containing groove (111a) and is fixedly connected with the motor housing (111).

3. A preforming mechanism according to claim 2, wherein The transmission shaft (122) includes a first shaft section (1221), a second shaft section (1222) and a third shaft section (1223) arranged in sequence along the axial direction, one end of the first shaft section (1221) away from the second shaft section (1222) is fixedly connected with the motor rotor (112), one end of the third shaft section (1223) away from the second shaft section (1222) is connected with the pre-plastic screw, the surface of the second shaft section (1222) is a toothed surface, and the second shaft section (1222) is engaged with the gear transmission assembly (1212).

4. A preforming mechanism according to claim 3, wherein The gear transmission assembly (1212) comprises an internal gear (1212a), a plurality of planetary gears and a retainer (1224), the internal gear (1212a) is fixedly arranged on the speed reducer housing (1211), the retainer (1224) is rotatably arranged in the speed reducer housing (1211), the retainer (1224) is sleeved on the transmission shaft (122) and is in interference fit with the transmission shaft (122), the plurality of planetary gears are rotatably arranged on the retainer (1224), the plurality of planetary gears are spaced apart along the circumference of the second shaft segment (1222) and are in meshing connection with the second shaft segment (1222), and the internal gear (1212a) surrounds the plurality of planetary gears and is in meshing connection with the plurality of planetary gears.

5. A preforming mechanism according to claim 4, wherein The retainer (1224) comprises a first fixed disc (1224a) and a second fixed disc (1224b), the first fixed disc (1224a) is in interference fit with one end of the first shaft segment (1221) towards the second shaft segment (1222), the second fixed disc (1224b) is in interference fit with one end of the third shaft segment (1223) towards the second shaft segment (1222), and two ends of each planetary gear are rotatably connected with the first fixed disc (1224a) and the second fixed disc (1224b) respectively.

6. A preforming mechanism according to claim 5, wherein The retainer (1224) further comprises a plurality of support ribs (1224c), the plurality of support ribs (1224c) are located between the first fixed disc (1224a) and the second fixed disc (1224b) and are spaced apart along the circumference of the first fixed disc (1224a) or the second fixed disc (1224b), and one planetary gear is arranged between two adjacent support ribs (1224c).

7. The preforming mechanism of claim 3, wherein One of the first shaft segment (1221) and the motor rotor (112) is provided with a connecting key (1221a), and the other is provided with a matching key groove, and the first shaft segment (1221) and the motor rotor (112) are in plug fit through the connecting key (1221a) and the matching key groove.

8. The preforming mechanism of claim 3, wherein The third shaft segment (1223) is a spline shaft.

9. The preforming mechanism of claim 2, wherein, The speed reducer housing (1211) and the motor housing (111) are in one-piece structure.

10. An injection molding machine characterized by, The pre-plasticizing mechanism (100) of any one of claims 1 to 9. The pre-plasticizing mechanism (100) of any one of claims 1 to 9.

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