High-speed ejection mechanism of all-electric injection molding machine

Abstract

The invention discloses an all-electric injection molding machine high-speed injection mechanism which comprises an injection table seat, a lead screw is rotationally arranged in the middle of the injection table seat, a driving assembly used for driving the lead screw to rotate is arranged at the end of the injection table seat, a plasticizing seat is connected to the outer circle wall of the lead screw, and a plasticizing motor is fixed to one side of the injection table seat and does not participate in injection action; the risk of fatigue fracture of the bolt due to the fact that the bolt for fixing the plasticizing motor bears large inertia moment in the high-speed injection process is avoided, meanwhile, the load of the plasticizing base in the injection process is reduced, and the overall stability of equipment in the high-speed injection process is improved; the risk that a fixing bolt of the plasticizing motor is broken when the injection speed is large enough due to the fact that the plasticizing motor and the thrust axis of the lead screw nut are not concentric at the moment of starting and stopping the injection action is avoided, and then the stability of the injection table during high-speed injection is improved, so that the production requirements of high-speed injection and high efficiency are met.

Description

Technical Field

[0001] The present invention relates to the technical field related to plasticizing motor fixing equipment for injection molding machines, and in particular to a high-speed injection mechanism of an all-electric injection molding machine. Background Art

[0002] With the rapid development of domestic new energy vehicles, 3C electronics, medical and other industries, the demand for injection molding machines in these fields is also increasing. At present, the injection structure of all-electric injection molding machines on the market is mostly driven by a servo motor to drive the ball screw, which drives the plasticizing seat, plasticizing motor and screw to reciprocate together to achieve the injection action. Due to the large injection inertia of the traditional all-electric injection structure, it cannot give full play to the advantages of high-speed injection and high precision of the all-electric injection molding machine, and it is difficult to meet the market's urgent demand for high precision and high efficiency of all-electric injection molding machines.

[0003] In the traditional all-electric injection structure, the injection inertia of the moving part during reciprocating injection is too large, which will cause the following problems: 1. Due to the large injection inertia, the acceleration time and deceleration time of the injection motor are too long, which cannot meet the requirements of ultra-high-speed injection and high efficiency; 2. The cantilever beam structure of the plasticizing motor causes the fixing bolts of the plasticizing motor to bear a large moment of inertia during high-speed injection, which leads to the risk of fatigue fracture of the bolts and reduces the overall stability of the machine during high-speed injection. Summary of the invention

[0004] The purpose of the present invention is to provide a high-speed injection mechanism for an all-electric injection molding machine to solve the problems of the traditional all-electric injection structure proposed in the above-mentioned background technology, such as large injection inertia during the reciprocating injection process, inability to meet the requirements of ultra-high-speed injection and high efficiency, and a high risk of fatigue fracture of the bolts fixing the plasticizing motor.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-speed injection mechanism of an all-electric injection molding machine, comprising a shooting platform seat, a screw rod is rotatably provided in the middle of the shooting platform seat, a driving assembly for driving the screw rod to rotate is provided at the end of the shooting platform seat, a plasticizing seat is connected to the outer circular wall of the screw rod, a guide sliding assembly for supporting the plasticizing seat is symmetrically provided on the top of the shooting platform seat, a mounting assembly is provided at the bottom of the plasticizing seat, a transmission assembly is provided on the top of the plasticizing seat, and a fixing assembly is provided on one side of the shooting platform seat connected to the transmission assembly.

[0006] Preferably, the driving assembly includes a driving frame provided on one side of the shooting platform, an injection motor is provided on the side of the driving frame, a driving wheel is connected to the output end of the injection motor, the screw rod passes through one end of the driving frame and is fixed with a passive wheel, and the active wheel is connected to the passive wheel through an injection synchronous belt.

[0007] Preferably, a mounting opening is provided on one side of the driving frame, and the end of the screw rod is rotatably arranged in the middle of the mounting opening.

[0008] Preferably, the guide slide assembly includes guide rails symmetrically arranged on the top of the shooting platform seat, and the plasticizing seat is slidably connected to the guide rails on both sides through a plurality of sliding blocks.

[0009] Preferably, the mounting assembly comprises a screw nut connected to the outer circular wall of the screw, the screw nut is fixedly connected to the plasticizing seat through a connecting plate, a fixing opening is provided at the bottom of the plasticizing seat, a plasticizing shaft is rotatably provided in the middle of the fixing opening, a guide hole is provided at one end of the plasticizing shaft, a screw connecting shaft is connected to the other end of the plasticizing shaft, a screw is inserted in the middle of the screw connecting shaft, and a transmission wheel is fixedly provided at the end of the plasticizing shaft.

[0010] Preferably, the fixing assembly comprises a motor fixing seat provided on one side of the shooting platform seat, and a plasticizing motor is fixed to the side of the motor fixing seat by bolts.

[0011] Preferably, a coupling is connected to the output end of the plasticizing motor, a ball spline is connected to the other end of the coupling, and a ball spline nut is provided on the outer circular wall of the ball spline.

[0012] Preferably, the transmission assembly includes the top center of the plasticizing seat, a transmission shaft is fixedly connected and rotatably provided with the ball spline nut, a transmission wheel 2 is provided at the end of the transmission shaft, and the transmission wheel 2 is transmission-connected to the installation assembly through a plasticizing synchronous belt.

[0013] Preferably, a shaft fixing hole is provided on the top of the plasticizing seat, a bearing whose inner ring is fitted with the transmission shaft is symmetrically provided in the shaft fixing hole, a plurality of bushings for axially positioning the bearings on both sides are provided on the outer circular wall of the transmission shaft, an oil seal is provided at each end of the fixing hole, and a pressure cover is provided at the opening of the shaft fixing hole.

[0014] Preferably, an adjustment frame is installed on one side of the plasticizing seat by bolts, and a tensioning wheel is connected to the middle of the adjustment frame.

[0015] Beneficial effects of the present invention: 1. By fixing the plasticizing motor on one side of the shooting platform seat so that it does not participate in the injection action, the bolts fixing the plasticizing motor are prevented from bearing a large inertia moment during high-speed injection, thereby causing the risk of bolt fatigue fracture. At the same time, the load of the plasticizing seat during the injection process is also reduced, thereby improving the overall stability of the equipment during high-speed injection. It is also avoided that at the moment of starting and stopping the injection action, due to the misalignment between the thrust axis of the plasticizing motor and the screw nut, when the injection speed is large enough, the fixing bolts of the plasticizing motor are prevented from breaking, thereby improving the stability of the shooting platform during high-speed injection, so as to meet the production requirements of high-speed injection and high efficiency.

[0016] 2. The plasticizing seat is slidably connected to the guide rail through the slider, so that the screw rod and screw rod nut cooperate to drive the plasticizing seat to move, which plays a supporting and guiding role for the plasticizing seat and improves the stability during the injection process.

[0017] 3. Start the plasticizing motor to drive the coupling to drive the ball spline to rotate synchronously, and then the ball spline nut drives the transmission shaft to rotate, and through the transmission wheel 1, the plasticizing synchronous belt and the transmission wheel 2, the plasticizing shaft drives the screw to rotate along the fixed port to achieve the plasticizing action. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a first-view stereoscopic structure of an embodiment of the present invention; Figure 2 is a schematic diagram of a second viewing angle stereoscopic structure of an embodiment of the present invention; Figure 3 It is a schematic diagram of a cross-sectional three-dimensional structure of an embodiment of the present invention; Figure 4 This is an enlarged structural schematic diagram of point A of an embodiment of the present invention; Figure 5 It is a schematic diagram of the enlarged structure of point B of an embodiment of the present invention.

[0019] In the figure: 1, injection platform seat; 2, screw rod; 3, drive assembly; 31, drive frame; 311, installation port; 32, injection motor; 33, driving wheel; 34, driven wheel; 35, injection timing belt; 4, plasticizing seat; 5, guide slide assembly; 51, guide rail; 52, slider; 6, installation assembly; 61, screw rod nut; 62, connecting plate; 63, fixing port; 64, plasticizing shaft; 65, guide hole; 66, screw connecting shaft ; 67. Screw; 68. Transmission wheel 1; 7. Fixing assembly; 71. Motor fixing seat; 72. Plasticizing motor; 8. Transmission assembly; 81. Transmission shaft; 82. Transmission wheel 2; 83. Plasticizing timing belt; 9. Coupling; 10. Ball spline; 11. Ball spline nut; 12. Shaft fixing hole; 13. Bearing 1; 14. Bushing; 15. Oil seal 1; 16. Pressure cover 1; 17. Adjustment frame; 18. Tensioner. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 5 The present invention provides a high-speed injection mechanism of an all-electric injection molding machine, including an injection platform seat 1, a screw rod 2 is rotatably provided in the middle of the injection platform seat 1, a driving component 3 for driving the screw rod 2 to rotate is provided at the end of the injection platform seat 1, a plasticizing seat 4 is connected to the outer circular wall of the screw rod 2, a guide sliding component 5 for supporting the plasticizing seat 4 is symmetrically provided on the top of the injection platform seat 1, a mounting component 6 is provided at the bottom of the plasticizing seat 4, a transmission component 8 is provided on the top of the plasticizing seat 4, and a fixing component 7 is provided on one side of the injection platform seat 1 connected to the transmission component 8. When the all-electric injection molding machine performs a plasticizing action, the fixing component 7 is started The plasticizing motor 72 in the drive assembly 8 is driven by the coupling 9, and the ball spline 10 and the transmission shaft 81 in the drive assembly 8 are rotated, so that the transmission wheel 1 68, the plasticizing synchronous belt 83 and the transmission wheel 2 82 cooperate to drive, and the screw 67 is driven to rotate to realize the plasticizing action, so that the plasticized melt is stored in the barrel for injection. By starting the injection motor 32 in the drive assembly 3, the driving wheel 33, the injection synchronous belt 35 and the driven wheel 34 are driven to cooperate, and then the screw 2 is driven to rotate, so that the screw nut 61 pushes the plasticizing seat 4 and the screw 67 to perform linear motion, and the molten plastic is injected into the mold cavity to realize the injection action; By fixing the plasticizing motor 72 to one side of the shooting platform seat 1 so that it does not participate in the injection action, the bolts fixing the plasticizing motor 72 are prevented from bearing a large inertia moment during high-speed injection, thereby causing the risk of bolt fatigue fracture. At the same time, the load of the plasticizing seat 4 during the injection process is also reduced, thereby improving the overall stability of the equipment during high-speed injection. It is avoided that at the moment of starting and stopping the injection action, due to the misalignment between the thrust axis of the plasticizing motor 72 and the screw nut 61, when the injection speed is large enough, the fixing bolts of the plasticizing motor 72 are at risk of fracture, thereby improving the stability of the shooting platform during high-speed injection, so as to meet the production requirements of high-speed injection and high efficiency.

[0022] like Figure 3As shown, specifically, the driving assembly 3 includes a driving frame 31 provided on one side of the shooting platform seat 1, an injection motor 32 is provided on the side of the driving frame 31, a driving wheel 33 is connected to the output end of the injection motor 32, the screw rod 2 passes through the driving frame 31 and is fixed with a passive wheel 34 at one end, the active wheel 33 is transmission-connected with the passive wheel 34 through an injection timing belt 35, and the injection motor 32 is started, and then the driving wheel 33, the injection timing belt 35 and the passive wheel 34 are transmission-coordinated, so that the screw rod 2 is driven to rotate in the middle of the driving frame 31, and then the screw rod 2 and the screw rod nut 61 cooperate to drive the plasticizing seat 4 to move along the guide rails 51 on both sides of the top of the shooting platform seat 1.

[0023] Specifically, a mounting opening 311 is opened on one side of the driving frame 31, and the end of the screw rod 2 is rotatably set in the middle of the mounting opening 311. By fixing one end of the screw rod 2 in the mounting opening 311 of the driving frame 31, it is convenient to drive the screw rod 2 to rotate along the mounting opening 311 through the injection motor 32, thereby realizing the driving of the plasticizing seat 4.

[0024] like Figure 2 As shown, specifically, the guide slide assembly 5 includes guide rails 51 symmetrically provided on the top of the shooting platform seat 1, and the plasticizing seat 4 is slidably connected to the guide rails 51 on both sides through a plurality of sliders 52. The plasticizing seat 4 is slidably connected to the guide rails 51 through the sliders 52, so that when the screw rod 2 and the screw rod nut 61 cooperate to drive the plasticizing seat 4 to move, the plasticizing seat 4 is supported and guided, thereby improving the stability during the injection process.

[0025] like Figure 4 As shown, specifically, the mounting assembly 6 includes a screw nut 61 connected to the outer circular wall of the screw 2, the screw nut 61 is fixedly connected to the plasticizing seat 4 through a connecting plate 62, a fixing port 63 is provided at the bottom of the plasticizing seat 4, a plasticizing shaft 64 is rotatably provided in the middle of the fixing port 63, a guide hole 65 is provided at one end of the plasticizing shaft 64, a screw connecting shaft 66 is connected to the other end of the plasticizing shaft 64, a screw 67 is inserted in the middle of the screw connecting shaft 66, and a transmission wheel 68 is fixedly provided at the end of the plasticizing shaft 64. By fixing and rotatably setting the plasticizing shaft 64 in the middle of the fixing port 63, and setting the screw 67 at one end of the plasticizing shaft 64 through the screw connecting shaft 66, it is convenient to drive the plasticizing shaft 64 to rotate or move respectively, so that the screw 67 can realize plasticizing or injection action.

[0026] Specifically, a plurality of bearings 2 are sleeved in the installation port 311 and the fixing port 63, and the outer circular walls of the screw rod 2 and the plasticizing shaft 64 are provided with locking nuts that fit with the inner ring of the bearing 2 at one end, and the openings of the installation port 311 and the fixing port 63 are provided with pressure covers 2 that fit with the outer ring of the bearing 2 at the other end. The screw rod 2 and the plasticizing shaft 64 are respectively fixed to the installation port 311 and the fixing port 63 by respectively sleeve-engaging one end of the screw rod 2 and the plasticizing shaft 64 with the inner ring of the bearing 2, and cooperating with the pressure covers 2 and the locking nuts.

[0027] Specifically, two ends of the installation opening 311 and the fixing opening 63 are respectively fitted with oil seals 2 and the outer circumferential walls of the screw rod 2 and the plasticizing shaft 64 to prevent the lubricating grease added to the installation opening 311 and the fixing opening 63 from leaking out from both ends.

[0028] like Figure 2 As shown, specifically, the fixing assembly 7 includes a motor fixing seat 71 provided on one side of the shooting platform seat 1, and a plasticizing motor 72 is fixedly provided on the side of the motor fixing seat 71 by bolts. The plasticizing motor 72 is fixedly connected to the shooting platform seat 1 through the motor fixing seat 71, so that the plasticizing motor 72 does not participate in the injection action, thereby avoiding the bolts fixing the plasticizing motor 72 from bearing a large inertia moment during the high-speed injection process, thereby causing the risk of bolt fatigue fracture, and also reducing the load of the plasticizing seat 4 during the injection process, thereby improving the overall stability of the equipment during high-speed injection.

[0029] like Figure 1 As shown, specifically, the output end of the plasticizing motor 72 is connected with a coupling 9, and the other end of the coupling 9 is connected with a ball spline 10. The outer cylindrical wall of the ball spline 10 is provided with a ball spline nut 11. By starting the plasticizing motor 72 to drive the coupling 9, the ball spline 10 is driven to rotate synchronously, and then the ball spline nut 11 drives the transmission shaft 81 to rotate, and through the transmission cooperation of the transmission wheel 1 68, the plasticizing synchronous belt 83 and the transmission wheel 2 82, the plasticizing shaft 64 is driven to drive the screw 67 to rotate along the fixed port 63 to realize the plasticizing action.

[0030] like Figure 2 As shown, specifically, the transmission assembly 8 includes a transmission shaft 81 fixedly connected and rotatably provided with the top center of the plasticizing seat 4 and the ball spline nut 11, and a transmission wheel 82 is provided at the end of the transmission shaft 81, and the transmission wheel 82 is transmission-connected with the mounting assembly 6 through a plasticizing synchronous belt 83, and the transmission wheel 1 68 and the transmission wheel 2 82 are transmission-connected through the plasticizing synchronous belt 83, and then the transmission shaft 81 is driven to rotate, and under the transmission cooperation of the transmission wheel 1 68, the plasticizing synchronous belt 83 and the transmission wheel 2 82, the plasticizing shaft 64 is driven to drive the screw 2 to rotate.

[0031] like Figure 4As shown, specifically, a shaft fixing hole 12 is opened on the top of the plasticizing seat 4, and a bearing 13 whose inner ring is fitted with the transmission shaft 81 is symmetrically arranged in the shaft fixing hole 12, and a plurality of bushings 14 are arranged on the outer circular wall of the transmission shaft 81 for axially positioning the bearings 13 on both sides, and oil seals 15 are respectively arranged on both sides of the shaft fixing hole 12. A pressure cover 16 is arranged at the opening of the shaft fixing hole 12, and the two bushings 14 are arranged to axially position the bearings 13 on both sides respectively, and the transmission shaft 81 is fixedly rotatably arranged inside the fixing hole by the pressure cover 16, so that the driving wheel can rotate synchronously with the ball spline 10 or move along the ball spline 10 under the action of the ball spline nut 11.

[0032] Specifically, an adjustment frame 17 is installed on one side of the plasticizing seat 4 by bolts, and a tensioning wheel 18 is connected to the middle of the adjustment frame 17. The installation position of the tensioning wheel 18 can be easily adjusted through the adjustment frame 17, so that the plasticizing synchronous belt 83 is always in a pre-tightened state under the tightening action of the tensioning wheel 18, thereby improving the stability during the transmission process.

[0033] Working principle of the present invention: When in use, when the all-electric injection molding machine is performing plasticizing action, by starting the plasticizing motor 72 in the fixed component 7, the coupling 9 drives the ball spline 10 and the transmission shaft 81 in the transmission component 8 to rotate, so that the transmission wheel 1 68, the plasticizing synchronous belt 83 and the transmission wheel 2 82 cooperate to drive, and the screw 67 is driven to rotate to realize the plasticizing action, so that the plasticized melt is stored in the barrel for injection. By starting the injection motor 32 in the drive component 3, the driving wheel 33, the injection synchronous belt 35 and the driven wheel 34 cooperate to drive, and then the screw 2 is driven to rotate, so that the screw nut 61 pushes the plasticizing seat 4 and the screw 67 to perform linear motion, and the molten plastic is injected into the mold cavity to realize the injection action.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed injection mechanism of an all-electric injection molding machine, comprising an injection platform (1), characterized in that: A screw rod (2) is rotatably provided in the middle of the shooting platform seat (1), a driving assembly (3) for driving the screw rod (2) to rotate is provided at the end of the shooting platform seat (1), a plasticizing seat (4) is connected to the outer circular wall of the screw rod (2), a guide sliding assembly (5) for supporting the plasticizing seat (4) is symmetrically provided at the top of the shooting platform seat (1), a mounting assembly (6) is provided at the bottom of the plasticizing seat (4), a transmission assembly (8) is provided at the top of the plasticizing seat (4), and a fixing assembly (7) is provided on one side of the shooting platform seat (1) connected to the transmission assembly (8).

2. The high-speed injection mechanism of an all-electric injection molding machine according to claim 1, characterized in that: The driving assembly (3) comprises a driving frame (31) provided on one side of the shooting platform (1), an injection motor (32) being provided on the side of the driving frame (31), a driving wheel (33) being connected to the output end of the injection motor (32), a driven wheel (34) being fixedly provided on one end of the screw rod (2) passing through the driving frame (31), and the driving wheel (33) being transmission-connected to the driven wheel (34) via an injection synchronous belt (35).

3. The high-speed injection mechanism of an all-electric injection molding machine according to claim 2, characterized in that: A mounting opening (311) is provided on one side of the driving frame (31), and the end of the screw rod (2) is rotatably disposed in the middle of the mounting opening (311).

4. The high-speed injection mechanism of an all-electric injection molding machine according to claim 1, characterized in that: The guide slide assembly (5) comprises guide rails (51) symmetrically arranged on the top of the shooting platform seat (1), and the plasticizing seat (4) is slidably connected to the guide rails (51) on both sides via a plurality of sliding blocks (52).

5. The high-speed injection mechanism of an all-electric injection molding machine according to claim 1, characterized in that: The mounting assembly (6) comprises a screw nut (61) connected to the outer circular wall of the screw (2); the screw nut (61) is fixedly connected to the plasticizing seat (4) via a connecting plate (62); a fixing opening (63) is provided at the bottom of the plasticizing seat (4); a plasticizing shaft (64) is rotatably provided in the middle of the fixing opening (63); a guide hole (65) is provided at one end of the plasticizing shaft (64); a screw connecting shaft (66) is connected to the other end of the plasticizing shaft (64); a screw (67) is inserted in the middle of the screw connecting shaft (66); and a transmission wheel (68) is fixedly provided at the end of the plasticizing shaft (64).

6. The high-speed injection mechanism of an all-electric injection molding machine according to claim 1, characterized in that: The fixing assembly (7) comprises a motor fixing seat (71) provided on one side of the shooting platform seat (1), and a plasticizing motor (72) is fixedly provided on the side of the motor fixing seat (71) by means of bolts.

7. The high-speed injection mechanism of an all-electric injection molding machine according to claim 6, characterized in that: The output end of the plasticizing motor (72) is connected to a coupling (9), the other end of the coupling (9) is connected to a ball spline (10), and the outer circular wall of the ball spline (10) is provided with a ball spline nut (11).

8. The high-speed injection mechanism of an all-electric injection molding machine according to claim 7, characterized in that: The transmission assembly (8) comprises a transmission shaft (81) fixedly connected to the ball spline nut (11) at the top center of the plasticizing seat (4), and a transmission shaft (81) is provided thereon for rotation. A second transmission wheel (82) is provided at the end of the transmission shaft (81), and the second transmission wheel (82) is transmission-connected to the mounting assembly (6) via a plasticizing synchronous belt (83).

9. The high-speed injection mechanism of an all-electric injection molding machine according to claim 8, characterized in that: A shaft fixing hole (12) is provided at the top of the plasticizing seat (4), a bearing (13) having an inner ring that fits the transmission shaft (81) is symmetrically arranged in the shaft fixing hole (12), a plurality of bushings (14) for axially positioning the bearings (13) on both sides are arranged on the outer circular wall of the transmission shaft (81), oil seals (15) are respectively arranged at both ends of the shaft fixing hole (12), and a pressure cover (16) is arranged at the opening of the shaft fixing hole (12).

10. The high-speed injection mechanism of an all-electric injection molding machine according to claim 1, characterized in that: An adjustment frame (17) is installed on one side of the plasticizing seat (4) via bolts, and a tensioning wheel (18) is connected to the middle of the adjustment frame (17).

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