Ejection device for injection molding machine and injection molding machine

Abstract

The application provides an ejection device of an injection molding machine and the injection molding machine. The ejection device comprises an ejection mechanism, a driving assembly, an output shaft and at least one set of transmission assembly. Each set of transmission assembly comprises a transmission wheel, a synchronous belt and a synchronous wheel. The first end of the output shaft is connected to the output end of the driving assembly. The transmission wheel is sleeved on the circumferential sidewall of the output shaft. The synchronous wheel is installed on the movable die plate of the injection molding machine. The synchronous belt is wound around the transmission wheel and the synchronous wheel and extends along the radial direction of the output shaft. The transmission assembly further comprises a synchronous connecting piece. The synchronous connecting piece is fixed to the synchronous belt. The ejection mechanism is connected to the synchronous connecting piece to follow the synchronous belt and move along the radial direction of the output shaft under the driving of the output shaft and the transmission wheel. The problems of high cost and limited application range in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of injection molding, and in particular to an ejector device for an injection molding machine and an injection molding machine. Background Technology

[0002] Injection molding machines (hereinafter referred to as injection molding machines) are the main molding equipment that uses plastic molds to make plastic products of various shapes from thermoplastic or thermosetting materials. When demolding, an external force is required to drive the ejection mechanism to demold the part.

[0003] Existing technology uses a motor-driven lead screw and nut mechanism to drive the ejection mechanism for demolding. However, such structures are all rigid transmissions, which suffer from high wear and tear and high maintenance costs during use. Furthermore, the rigid connection transmission method is only suitable for ordinary hard parts. When demolding elastic or flexible parts (such as springs), it is easy to damage the parts.

[0004] It is evident that existing injection molding machine ejection devices suffer from high costs and limited applicability. Summary of the Invention

[0005] This invention provides an ejector device for an injection molding machine and an injection molding machine, which solves the problems of high cost and limited applicability in the prior art.

[0006] This invention provides an ejection device for an injection molding machine, including an ejection mechanism, comprising a drive assembly, an output shaft, and at least one set of transmission assemblies;

[0007] Each transmission assembly includes a transmission wheel, a timing belt, and a timing pulley. The first end of the output shaft is connected to the output end of the drive assembly. The transmission wheel is sleeved on the circumferential sidewall of the output shaft. The timing pulley is installed on the moving platen of the injection molding machine. The timing belt is wrapped around the transmission wheel and the timing pulley and extends radially along the output shaft.

[0008] The transmission assembly also includes a synchronous connector, which is fixed to the synchronous belt. The ejector mechanism is connected to the synchronous connector to follow the synchronous belt and move radially along the output shaft under the drive of the output shaft and the transmission wheel.

[0009] This invention, through the arrangement of a transmission wheel, synchronous belt, synchronous pulley, and synchronous connector, converts the movement direction of the output shaft into a horizontal linear thrust, driving the ejection mechanism to achieve the output force and forward / backward movement of the ejection action. By eliminating the need for related accessories (such as bearings and fixing nuts) required for the entire lead screw and lead screw nut assembly, the production and maintenance costs of the injection molding machine can be significantly reduced. Furthermore, the use of a soft transmission method with a synchronous belt allows the injection molding machine ejection device to be used with elastic or flexible parts (such as springs), thus broadening the applicability of the injection molding machine ejection device of this invention.

[0010] Optionally, the synchronous connector includes a first connector, a second connector, and a fixing member. The synchronous belt is clamped between the first connector and the second connector, and the fixing member passes through the edges of the first connector and the second connector to fix the synchronous belt between the first connector and the second connector.

[0011] The side walls of the first and second connectors are fixed to the ejection mechanism.

[0012] The above structure enables the synchronous belt to be linked with the ejector mechanism, and has high stability. The synchronous belt is not easy to fall off, and the synchronization is high.

[0013] Optionally, the side of the first connector facing the second connector, and / or the side of the second connector facing the first connector, has a first toothed groove, further improving the clamping stability of the timing belt.

[0014] Optionally, the synchronous belt has a first engagement groove on its surface facing the output shaft, and both the surface of the drive pulley and the synchronous pulley have second engagement grooves. The synchronous belt engages with the drive pulley and the synchronous pulley through the first and second engagement grooves. This structure improves the assembly stability of the synchronous belt with the drive pulley and the synchronous pulley, enhances the synchronization effect, prevents the synchronous belt from jamming during transmission, thereby improving transmission efficiency and reducing equipment failure rate.

[0015] Optionally, a connecting block is provided on the side of the ejector mechanism near the output shaft. The connecting block and the synchronous connector are arranged side by side along the axial direction of the output shaft and fixed together. This structure allows the ejector mechanism to avoid interference with other components when connected to the synchronous connector.

[0016] Optionally, the ejection device of the injection molding machine also includes a mounting plate and a mounting plate fastener. The mounting plate has mounting holes, at least a portion of the drive assembly is mounted in the mounting holes, and the mounting plate is also provided with an adjustment hole. The extension direction of the adjustment hole is consistent with the extension direction of the timing belt. The mounting plate fastener passes through the adjustment hole and one end of it is fixed to the moving platen of the injection molding machine. The mounting plate can move relative to the output shaft under the action of external force through the adjustment hole.

[0017] The mounting plate has an adjusting screw on its edge, with one end of the adjusting screw abutting against the moving platen of the injection molding machine.

[0018] Through the above-described structure, the mounting plate can be moved along the same extension direction of the synchronous belt (or the direction of movement of the ejector mechanism) by means of the adjusting screw, adjusting hole and mounting plate fixing component. This allows the relative position of the output shaft and the synchronous belt to be adjusted without disassembling the output shaft and the transmission wheel, which helps the synchronous belt to always be in a taut state and ensures transmission stability.

[0019] Optionally, the drive assembly includes a motor and a reducer, with the output end of the motor connected to the input end of the reducer, the output end of the reducer connected to the first end of the output shaft, and the reducer installed in the mounting hole.

[0020] Optionally, the ejection device of the injection molding machine also includes a shaft mounting base and an elastic retaining ring. The shaft mounting base is fixed to the moving platen of the injection molding machine, and the second end of the output shaft is mounted on the shaft mounting base through the elastic retaining ring.

[0021] Optionally, the number of transmission components is multiple, and the multiple transmission components are arranged in parallel along the axial direction of the output shaft.

[0022] The present invention also provides an injection molding machine, including the injection molding machine ejection device involved in the above embodiments and implementation methods. Attached Figure Description

[0023] Figure 1 This is an exploded structural diagram of the injection molding machine ejection device and the injection molding moving template in one embodiment of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of the local structure of region H in the middle;

[0025] Figure 3 This is a three-dimensional structural diagram of the injection molding machine ejection device and the injection molding machine moving template in one embodiment of the present invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the ejection device of an injection molding machine in one embodiment of the present invention;

[0027] Figure 5 This is a top view of the ejection device of an injection molding machine in one embodiment of the present invention;

[0028] Figure 6 In one embodiment of the present invention, the ejection device of the injection molding machine is along Figure 5 A schematic diagram of the cross-sectional structure cut along the CC direction;

[0029] Figure 7 for Figure 6 Enlarged view of the local structure of region E in the middle;

[0030] Figure 8 In one embodiment of the present invention, the ejection device of the injection molding machine is along Figure 5 A schematic diagram of the cross-sectional structure cut along the DD direction.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1: Ejector device for injection molding machine;

[0033] 10: Output shaft; 101: Bearing; 102: Tensioner sleeve; 111: Synchronous belt; 111': Synchronous belt; 1110: First meshing groove; 112: Drive pulley; 112': Drive pulley; 1120: Second meshing groove; 1121: Tensioner sleeve; 1121': Tensioner sleeve; 113: Synchronous pulley; 113': Synchronous pulley; 1130: Second meshing groove; 1131: Synchronous pulley mounting plate; 1131': Synchronous pulley mounting plate; 1132: Bearing; 1133: Axle;

[0034] 114: Synchronous connector; 1140: First toothed groove; 1141: First connector; 1142: Second connector; 1143: Fixing component;

[0035] 12: Drive assembly; 121: Motor; 122: Reducer; 123: Connecting sleeve; 13: Ejection mechanism; 131: Connecting block;

[0036] 14: Mounting plate; 142: Adjustment hole; 143: Adjustment screw; 144: Mounting plate fastener;

[0037] 15: Shaft mounting base; 16: Elastic retaining ring;

[0038] 2: Dynamic template. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0040] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0042] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] Please see Figures 1-4 The present invention provides an ejection device 1 for an injection molding machine, including an ejection mechanism 13, including a drive assembly 12, an output shaft 10 and at least one set of transmission assemblies;

[0046] like Figure 1 , Figure 2 and Figure 4 As shown, each transmission assembly includes a transmission wheel 112, a timing belt 111, and a timing pulley 113. The first end of the output shaft 10 is connected to the output end of the drive assembly 12. The transmission wheel 112 is sleeved on the circumferential sidewall of the output shaft 10, and the timing pulley 113 is mounted on the moving platen 2 of the injection molding machine (e.g., ...). Figure 2 As shown), the timing belt 111 is wound around the drive pulley 112 and the timing pulley 113, and extends radially along the output shaft 10. In one embodiment, the timing belt 111 extends in a horizontal direction perpendicular to the output shaft 10.

[0047] The transmission assembly also includes a synchronous connector 114, which is fixed to the synchronous belt 111. The ejector mechanism 13 is connected to the synchronous connector 114 to follow the synchronous belt 111 and move radially along the output shaft 10 under the drive of the output shaft 10 and the transmission wheel 112.

[0048] The term "at least one set of transmission components" can be understood as referring to the fact that the number of transmission components can be one or more sets. In one embodiment, there are two sets of transmission components, arranged side-by-side along the axial direction of the output shaft 10. The components of the other set of transmission components are similar to those of the aforementioned transmission components, including a transmission pulley 112', a synchronous belt 111', and a synchronous pulley 113'. Their connection relationships with the other components are similar to those of the aforementioned transmission components and will not be repeated here. In other alternative embodiments, there may be three or four sets of transmission components, etc.

[0049] This invention, through the arrangement of transmission wheels (e.g., transmission wheels 112 and 112'), synchronous belts (e.g., synchronous belts 111 and 111'), synchronous pulleys (e.g., synchronous pulleys 113 and 113'), and synchronous connectors 114, converts the movement direction of the output shaft 10 into a horizontal linear thrust, driving the ejector mechanism 13 to achieve the output force and forward / backward movement of the ejection action. Because it eliminates the need for all the necessary accessories (e.g., bearings and fixing nuts) for the entire lead screw and lead screw nut assembly, it significantly reduces the production and maintenance costs of the injection molding machine. Furthermore, the use of a soft transmission method with synchronous belts allows the injection molding machine ejector device 1 to be applied to elastic or flexible parts (e.g., springs), thus broadening the applicability of the injection molding machine ejector device of this invention.

[0050] Specifically, the output shaft 10 is a rotating shaft that passes through and rotates within the bearing 101, and passes through the connecting sleeve 123 and is clamped by the tensioning sleeve 102, rotating together with the connecting sleeve 123. Tensioning sleeves 1121 and 1121' are provided between the transmission wheels (e.g., transmission wheels 112 and 112') and the output shaft 10, respectively, to clamp the transmission wheels to the output shaft and cause them to rotate together with the output shaft. In other alternative embodiments, the tensioning sleeve may not be provided; for example, the output shaft 10 and the connecting sleeve 123 may be integrally formed. Furthermore, the timing belts 111 and 111' may be belts or chains.

[0051] In one implementation, such as Figure 2 As shown, the synchronous connector 114 includes a first connector 1141, a second connector 1142, and a fixing member 1143. A synchronous belt 111' is sandwiched between the first connector 1141 and the second connector 1142. The fixing member 1143 passes through the edges of the first connector 1141 and the second connector 1142 to fix the synchronous belt 111' between them. The sidewalls of the first connector 1141 and the second connector 1142 are fixed to the ejection mechanism 13. Those skilled in the art will understand that the number of synchronous connectors 114 matches the number of synchronous belts, with each synchronous belt sandwiched between one synchronous connector 114. This structure enables the synchronous belt to move in conjunction with the ejection mechanism, providing high stability, preventing the synchronous belt from easily detaching, and ensuring high synchronization.

[0052] Furthermore, such as Figure 2 As shown, the side of the first connector 1141 facing the second connector 1142, and / or the side of the second connector 1142 facing the first connector 1141, has a first toothed groove 1140, which further improves the clamping stability of the timing belt. Those skilled in the art will understand that the shape of the first toothed groove 1140 is not limited; for example, its cross-sectional shape may be triangular, rectangular, trapezoidal, arc-shaped, etc.

[0053] For further details, please see Figure 1 and Figure 4 The synchronous belt (e.g., synchronous belt 111) has a first engagement groove 1110 on its surface facing the output shaft 10. The surfaces of the drive pulley (e.g., drive pulley 112) and the synchronous pulley (e.g., synchronous pulley 113) both have second engagement grooves (e.g., second engagement groove 1120 and second engagement groove 1130). The synchronous belt 111 engages with the drive pulley 112 and the synchronous pulley 113 through the first engagement groove 1110 and the second engagement grooves (e.g., second engagement groove 1120 and second engagement groove 1130). This structure improves the assembly stability of the synchronous belt with the drive pulley and synchronous pulley, enhances synchronization, prevents the synchronous belt from jamming during transmission, thereby improving transmission efficiency and reducing equipment failure rate. The shape of the engagement grooves is not limited; they can be rectangular grooves, arc-shaped grooves, V-shaped grooves, trapezoidal grooves, etc.

[0054] For further details, please see Figure 4 and combined Figure 1 It is understood that the ejector mechanism 13 has a connecting block 131 on the side near the output shaft 10. The connecting block 131 and the synchronous connector 114 are arranged side by side and fixed together along the axial direction of the output shaft 10. This structure allows the ejector mechanism 13 to avoid interference with other components when connected to the synchronous connector 114. In one embodiment, there can be multiple connecting blocks 131, each connected to a corresponding synchronous connector. In other alternative embodiments, there can be a single connecting block 131, located inside the multiple synchronous connectors 114, with its outer wall connected to the side wall of the synchronous connector 114. In an exemplary embodiment, the connecting block 131 is fixed to the ejector mechanism 13 by screws. The connecting block 131 and the synchronous connector 114 can be connected by screws or welded together.

[0055] For further details, please see Figure 4 and combined Figure 1 It is understood that the injection molding machine ejection device 1 also includes a mounting plate 14 and a mounting plate fixing member 144. The mounting plate has mounting holes, and at least a portion of the drive assembly (e.g., the reducer 122 mentioned later) is mounted in the mounting holes. The mounting plate 14 is also provided with an adjustment hole 142, the extension direction of which is consistent with the extension direction of the timing belt 111. The mounting plate fixing member 144 passes through the adjustment hole 142 and one end is fixed to the moving platen 2 of the injection molding machine. The mounting plate 14 can move relative to the output shaft 10 under the action of external force through the adjustment hole 142. In one embodiment, the adjustment hole 142 is an oblong hole; in other alternative embodiments, the adjustment hole 142 can also be other elongated holes.

[0056] The edge of the mounting plate 14 is provided with adjusting screws 143, one end of which abuts against the moving platen 2 of the injection molding machine (e.g., Figure 3 As shown, external force can be applied to the mounting plate by tightening or loosening the adjusting screw 143, thereby changing the relative position of the mounting plate 143 and the output shaft 10. In one embodiment, as... Figure 4 As shown, the mounting plate 14 has an extension at its edge, which is L-shaped and located at the top and bottom edges of the mounting plate 14. An adjusting screw 143 is located on this extension. This structure allows for a reduction in the thickness of the mounting plate 14, lowering production costs while facilitating adjustment.

[0057] Through the above-described structure, the mounting plate 14 can be moved along the extension direction of the synchronous belt 111 (or can be understood as the movement direction of the ejector mechanism 13) by means of the adjusting screw 143, adjusting hole 142 and mounting plate fixing member 144. This allows the relative position of the output shaft 10 and the synchronous belt 111 to be adjusted without disassembling the output shaft 10 and the transmission wheel 112, which helps the synchronous belt 111 to always be in a taut state and ensures transmission stability.

[0058] In one implementation, such as Figure 1 and Figure 4 As shown, the drive assembly includes a motor 121 and a reducer 122. The output end of the motor 121 is connected to the input end of the reducer 122. Specifically, the bottom of the motor 121 is fixed to the reducer 122 with screws. The output end of the reducer 122 is connected to the first end of the output shaft 10. The reducer 122 is installed in the mounting hole of the mounting plate 14. Specifically, the reducer 122 is fixed to the mounting plate 14 with screws. A connecting sleeve 123 is provided on the output flange of the reducer 122. The connecting sleeve 123 is fixed to the output flange of the reducer 122 with screws.

[0059] In one implementation, please refer to Figures 5-7 and refer to Figure 1 It is understood that the ejection device 1 of the injection molding machine also includes a shaft mounting base 15 and an elastic retaining ring 16. The shaft mounting base 15 is fixed to the moving platen 2 of the injection molding machine, and the second end of the output shaft 10 is mounted on the shaft mounting base 15 through the elastic retaining ring 16. By setting the shaft mounting base 15, the output stability of the output shaft 10 can be improved, shaft wobble can be avoided, and noise and mechanical wear can be reduced. In an exemplary embodiment, the bearing 101 of the aforementioned output shaft 10 is mounted on the shaft mounting base 15, and the output shaft 10 passes through the bearing 101 and is limited and supported by the elastic retaining ring 16.

[0060] Furthermore, in one implementation, please refer to Figure 4 , Figure 5 and Figure 8It is understood that the injection molding machine ejection device 1 also includes a timing pulley mounting plate (e.g., timing pulley mounting plate 1131 and timing pulley mounting plate 1131'). The following description uses timing pulley mounting plate 1131 as an example; the structure of timing pulley mounting plate 1131' is similar. Timing pulley mounting plate 1131 is L-shaped, and its long arm is fixed to the moving platen 2 with screws. In other alternative embodiments, it can also be fixed by other methods, such as... Figure 8 As shown, a bearing 1132 is provided on the synchronous pulley mounting plate 1131, and the synchronous pulley 113 is mounted on the bearing 1132. The wheel axle 1133 of the synchronous pulley 113 is connected to the short arm of the synchronous pulley mounting plate 1131. In one embodiment, the synchronous pulley 113 is provided with an axial elastic retaining ring to limit the synchronous pulley 113.

[0061] An example of the working process is as follows:

[0062] Motor 121 outputs torque, which is reduced in speed and increased in torque via reducer 122. The torque is transmitted to output shaft 10 via connecting sleeve 123 and tensioning sleeve 102. The torque is then transmitted to drive pulleys 112 and 112' via tensioning sleeves 1121 and 1121'. The torque is converted into horizontal force via synchronous belts 111 and 111'. This horizontal force is transmitted to the ejection mechanism 13 (e.g., ejector plate assembly) via connecting block 131 and synchronous connector 114. The forward and backward movement of the ejector plate assembly can be achieved by changing the forward and reverse rotation of motor 121; the speed of the ejector plate assembly can be adjusted by changing the output speed of the motor; and the force of the ejector plate assembly can be adjusted by changing the output current of motor 121. The ejector plate assembly's own guide rod is fixed to the moving template 2, and its top plate and ejector rod can reciprocate along the axial direction of the guide rod.

[0063] Those skilled in the art will understand that the tensioning sleeve mentioned in the above embodiments may also be a flat key or a spline in other alternative embodiments, and the bearing mentioned in the above embodiments may also be a graphite self-lubricating copper sleeve in other alternative embodiments. The present invention does not limit this.

[0064] The present invention also provides an injection molding machine, including the injection molding machine ejection device 1 involved in the above embodiments and their possible implementations.

[0065] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An ejection device for an injection molding machine, comprising an ejection mechanism, characterized in that, Includes a drive assembly, an output shaft, and at least one set of transmission components; Each set of transmission components includes a transmission wheel, a timing belt, and a timing pulley. The first end of the output shaft is connected to the output end of the drive component. The transmission wheel is sleeved on the circumferential sidewall of the output shaft. The timing pulley is installed on the moving platen of the injection molding machine. The timing belt is wrapped around the transmission wheel and the timing pulley and extends radially along the output shaft. The transmission assembly further includes a synchronous connector, which is fixed to the synchronous belt. The ejector mechanism is connected to the synchronous connector to follow the synchronous belt and move radially along the output shaft under the drive of the output shaft and the transmission wheel. The synchronous connector includes a first connector, a second connector, and a fixing member. The synchronous belt is sandwiched between the first connector and the second connector, and the fixing member passes through the edges of the first connector and the second connector to fix the synchronous belt between the first connector and the second connector. The sidewalls of the first connector and the second connector are fixed to the ejection mechanism; The injection molding machine ejection device further includes a mounting plate and a mounting plate fixing member. The mounting plate has a mounting hole, and at least a portion of the drive assembly is mounted in the mounting hole. The mounting plate is also provided with an adjustment hole, the extension direction of which is consistent with the extension direction of the timing belt. The mounting plate fixing member passes through the adjustment hole and one end of it is fixed to the moving platen of the injection molding machine. The mounting plate can move relative to the output shaft under the action of external force through the adjustment hole. The mounting plate is provided with an adjusting screw on its edge, and one end of the adjusting screw abuts against the moving platen of the injection molding machine.

2. The ejector device for an injection molding machine according to claim 1, characterized in that, The first connector has a toothed groove on the side facing the second connector, and / or the second connector has a toothed groove on the side facing the first connector.

3. The ejector device for an injection molding machine according to claim 1, characterized in that, The synchronous belt has a first engagement groove on the side surface facing the output shaft, and the surfaces of the transmission wheel and the synchronous wheel are both provided with second engagement grooves. The synchronous belt engages with the transmission wheel and the synchronous wheel through the first engagement groove and the second engagement groove.

4. The injection molding machine ejection device according to claim 1, characterized in that, The ejector mechanism has a connecting block on the side near the output shaft. The connecting block and the synchronous connector are arranged side by side and fixed together along the axial direction of the output shaft.

5. The ejector device for an injection molding machine according to claim 1, characterized in that, The drive assembly includes a motor and a reducer. The output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to the first end of the output shaft. The reducer is installed in the mounting hole.

6. The ejector device for an injection molding machine according to claim 1, characterized in that, It also includes a shaft mounting base and an elastic retaining ring. The shaft mounting base is fixed to the moving template of the injection molding machine, and the second end of the output shaft is mounted to the shaft mounting base through the elastic retaining ring.

7. The ejector device for an injection molding machine according to claim 1, characterized in that, The transmission components are in multiple sets, and the multiple sets of transmission components are arranged side by side along the axial direction of the output shaft.

8. An injection molding machine, characterized in that, Includes the ejector device for an injection molding machine as described in any one of claims 1 to 7.

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