An injection molding machine

Abstract

This invention relates to an injection molding machine, comprising a base, an injection barrel, an injection screw, a pressure sensor, and a power unit. The power unit includes a power screw, a power sleeve, a power shaft, a feeding power mechanism, an injection power mechanism, and an injection auxiliary mechanism. On one hand, this invention increases injection power by providing power through the injection auxiliary mechanism, thereby reducing the power requirements of the injection power mechanism. On the other hand, through the coordination of the feeding power mechanism, the injection power mechanism, and the injection auxiliary mechanism, combined with the braking or releasing of the braking components, it not only enables energy storage during feeding but also reduces the power requirements of the feeding power mechanism. Therefore, this invention not only reduces the power requirements of injection and feeding but also facilitates switching between linear and rotary motion.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology, and specifically relates to an injection molding machine. Background Technology

[0002] Currently, the injection unit of an injection molding machine mainly performs four actions:

[0003] Injection: The injection motor drives the rotating lead screw to push the injection screw forward;

[0004] Pressure holding: Maintaining the pressure in the mold cavity and the material tube at a constant level for a period of time, during which the injection motor continues to work;

[0005] Feeding: The feeding motor drives the injection screw to rotate (the injection screw can only rotate in one direction);

[0006] Back pressure release: When the feeding motor drives the injection screw to rotate, the pressure at the front of the injection screw will increase and generate back pressure. At this time, the power screw needs to move backward to release the back pressure. At this time, the feeding motor and the injection motor work simultaneously.

[0007] However, most injection molding machines use a servo motor to control both the injection shaft and the feeding shaft. The injection motor drives the lead screw to rotate via the injection belt, pushing the injection screw forward and backward. During feeding, the feeding motor drives the injection screw to rotate. As a result, each of the injection and feeding processes requires a servo motor (generally, the injection servo motor is larger than the feeding servo motor). Throughout the injection process, they do not simultaneously operate at maximum torque (meaning that when the injection motor outputs maximum power, the feeding motor will not be at its maximum output at the same time, and vice versa). Therefore, the utilization efficiency of the motors is relatively low. Consequently, not only does the selection of servo motors increase the cost of the injection molding machine, but the low utilization rate of servo motors also results in high injection molding costs. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an improved injection molding machine.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an injection molding machine, comprising:

[0010] Base;

[0011] A plastic injection cylinder includes a cylinder body that forms a material cavity inside and an injection nozzle located at the front end of the cylinder body, wherein the cylinder body is provided with a plastic raw material inlet.

[0012] The injection screw extends along the length of the injection barrel and extends into the machine base from the rear end;

[0013] Pressure sensor;

[0014] A power unit is provided for driving an injection screw to rotate about its own axis and / or move linearly along its own length. Specifically, the power unit includes a power screw, a power sleeve, a power shaft, a feeding power mechanism, an injection power mechanism, and an injection auxiliary mechanism. The power screw is concentric with the injection screw, and its helix direction is opposite to that of the injection screw. The power sleeve is threadedly engaged with the power screw. The power shaft coaxially connects the power sleeve and the injection screw and is capable of rotating about its own axis or moving along its own axis. The front end of the power shaft is connected to the rear end of the injection screw, and the rear end of the power shaft is rotatably connected to the front end of the power sleeve. The power shaft has an internal connection hole that matches the front end of the power screw. The feeding power mechanism includes a feeding power component that drives the power shaft to rotate about its own axis and a braking component. The system includes a braking component to brake the power component and limit the rotation of the power shaft; an injection power mechanism to drive the power screw to rotate around its own axis; and an injection auxiliary mechanism including multiple auxiliary cylinders, an accumulator, and a control valve that are evenly spaced around and parallel to the power screw. The auxiliary cylinders extend and retract synchronously and move synchronously with the power sleeve. During injection, the injection power mechanism and auxiliary cylinders work synchronously, the braking component brakes the power shaft, the power screw rotates, and the power sleeve, power shaft, and injection screw all advance without rotating to inject the plastic raw material. During pressure holding, the injection power mechanism and auxiliary cylinders work together to maintain the set pressure. During material feeding, the injection power mechanism drives the power screw to rotate in the opposite direction, while the material feeding power component drives the power shaft to rotate in coordination, so that the power screw and power sleeve rotate in place to feed the material.

[0015] Preferably, during feeding, the rotational speed of the power screw is N1, and the rotational speed of the power shaft is N2. When N1 = N2, the power screw and power sleeve rotate in place to feed; when N1 > N2, the power sleeve retracts, and the auxiliary cylinder compresses and stores energy. Here, by controlling the rotational speeds N1 and N2, it is possible to implement feeding by rotating the power screw and power sleeve in place or by compressing the auxiliary cylinder to store energy.

[0016] According to a specific embodiment and preferred aspect of the invention, before the start of the next injection action, the control valve disconnects the accumulator and the auxiliary cylinder; and / or, the control valve is a solenoid bidirectional shut-off valve. Under the hydraulic circuit control of the solenoid bidirectional shut-off valve, the auxiliary force provided by the auxiliary cylinder can be implemented.

[0017] According to another specific embodiment and preferred aspect of the invention, the power sleeve and the power shaft are connected by a bearing drive, and a lubricating oil storage cavity is formed inside the base, in which the bearing is immersed; and / or, the bearing is a needle roller bearing. Here, on the one hand, the lubrication of the needle roller bearing is ensured by the oil immersion mode; on the other hand, the synchronization of the movement of the power sleeve and the power shaft can be improved.

[0018] Preferably, a bearing cover plate is formed on the outer periphery of the needle roller bearing, and an injection transmission seat is provided on the outer periphery of the power screw to avoid the movement of the power screw. Multiple auxiliary cylinders are located between the bearing cover plate and the injection transmission seat.

[0019] Furthermore, a threaded mating hole is formed inside the power screw sleeve, wherein the diameter of the threaded mating hole and the connecting hole are equal and aligned at the center. This facilitates the relative insertion of the front end of the power screw, shortens the equipment size, and keeps the outer diameter of the power screw equal.

[0020] According to another specific embodiment and preferred aspect of the invention, when the brake is engaged or the anti-flow delay is initiated, the injection power mechanism drives the power screw to rotate to overcome the force of the auxiliary cylinder and cause the power sleeve to retract.

[0021] According to another specific embodiment and preferred aspect of the present invention, the feeding power component includes a feeding pulley sleeved on the outer periphery of the power shaft with the shaft aligned with the shaft center, a feeding motor with the output shaft parallel to the injection screw, a feeding transmission component that drivesly connects the output shaft of the feeding motor to the feeding pulley, a braking component disposed on the output shaft and capable of braking the rotation of the feeding pulley, the power shaft and the feeding pulley being able to rotate synchronously, and the power shaft being able to move relative to the feeding pulley along its own length direction.

[0022] Preferably, a keyway extending along the length of the injection screw is formed on the feeding pulley, and a transmission key matching the keyway is fixedly formed on the drive shaft; and / or, the keyway and the transmission key form a keyway group, and the feeding power component includes multiple keyway groups, which are evenly spaced around the circumference of the drive shaft. The arrangement of multiple keyway groups ensures the synchronization accuracy of the drive shaft and the drive shaft, and can form a limit during linear motion, further reducing the possibility of rotation of the injection screw during linear motion.

[0023] Furthermore, the ball screw assembly formed by the power screw, power shaft, and power sleeve is located within the machine base and is capable of oil immersion lubrication; and / or, the rear end of the power screw extends out from the rear end of the machine base, and the injection power mechanism includes an injection pulley fixed to the rear end of the power screw, an injection motor located at the bottom of the machine base, and an injection transmission component for drivingly connecting the injection motor and the injection pulley.

[0024] In summary, the injection molding machine operates as follows:

[0025] Injection: The injection motor and accumulator supply oil to the injection auxiliary cylinder. At this time, the jaw brake is engaged. With the cooperation of the keyway mating part, the injection motor drives the power screw to rotate clockwise, realizing the forward movement of the power sleeve and the power shaft (that is, the forward movement of the injection screw).

[0026] Pressure holding: The injection motor and auxiliary hydraulic cylinder work together to maintain a certain pressure.

[0027] Add ingredients:

[0028] State 1: The injection motor drives the power screw to rotate counterclockwise at a speed of N1, the feeding motor drives the power shaft to rotate at a speed of N2, N1=N2, and the screw and power sleeve rotate in place to feed material;

[0029] State 2: When the material is fed to a certain stage in State 1, back pressure is generated. At this time, the speed of the power screw is increased from N1 to N2, the power screw sleeve retracts, and the injection auxiliary cylinder is compressed and stored.

[0030] Repeating states 1 and 2 enables the storage of energy for feeding and compression of the injection auxiliary cylinder.

[0031] Rear Loosening (Anti-Drip): The jaw brake is engaged, and the injection motor rotates counterclockwise to overcome the force of the injection auxiliary cylinder and cause the power sleeve to retract.

[0032] Before the next injection action begins, the accumulator and the injection auxiliary cylinder are disconnected.

[0033] It should be noted that the use of hydraulic accumulators has the following advantages: during injection, the acceleration is faster, improving the overall injection performance; during pressure holding, it can continuously provide a force, reducing the output of the injection motor and improving the control effect of pressure holding; after the hydraulic valve in the hydraulic circuit is closed, the position of the injection motor can be kept still, so when waiting to inject, the injection motor does not need to be kept in a fixed position (or the motor does not need to be braked).

[0034] Regarding the factors contributing to the reduction in injection motor specifications: the accumulator provides part of the power. The factors contributing to the reduction in feed motor specifications: the power for feeding is provided jointly by the injection motor and the feed motor. Simultaneously, when the injection motor and feed motor work together, two operating conditions must be met: 1. The thread directions of the injection screw and the power screw must be opposite; 2. The use of a jaw brake.

[0035] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0036] On the one hand, this invention increases the injection power by providing power through the injection auxiliary mechanism, thereby reducing the power requirements of the injection power mechanism; on the other hand, through the cooperation of the feeding power mechanism, the injection power mechanism, and the injection auxiliary mechanism, combined with the braking or releasing of the braking components, it can not only store energy during feeding, but also reduce the power requirements of the feeding power mechanism. Therefore, this invention not only reduces the power requirements of injection and feeding, but also facilitates switching between linear and rotational motion. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the injection molding machine of the present invention;

[0038] Figure 2 for Figure 1 Front view diagram;

[0039] Figure 3 for Figure 2 A diagram showing the view from the right.

[0040] Figure 4 for Figure 1 A top-down view;

[0041] Figure 5 for Figure 4 Enlarged cross-sectional view along the AA direction (omitted the injection nozzle);

[0042] Figure 6 for Figure 1 A partial structural diagram is omitted.

[0043] Figure 7 for Figure 6 Front view diagram;

[0044] Figure 8 for Figure 1 A structural decomposition diagram;

[0045] Figure 9 for Figure 8 Schematic diagram of local structural decomposition in the middle;

[0046] Figure 10 for Figure 1 Schematic diagram of the working principle of the injection auxiliary mechanism;

[0047] Among them: 1. Base; 10. Rear seat body; 11. Front seat body;

[0048] 2. Injection barrel; 20. Injection barrel body; 21. Injection nozzle; 20a. Plastic raw material inlet;

[0049] 3. Injection screw;

[0050] 4. Pressure sensor;

[0051] D. Power unit; 5. Power screw; 6. Power sleeve; 7. Power shaft; g. Needle roller bearing; b. Bearing cover plate; 8. Feeding power mechanism; 80. Feeding power component; 800. Feeding pulley; 801. Feeding motor; 802. Feeding transmission component; 802a. Transmission gear; c1. Keyway; c2. Transmission key; C. Keyway assembly; 81. Braking component; 9. Injection power mechanism; 90. Injection pulley; 91. Injection motor; 92. Injection transmission component; 920. Injection synchronous pulley; 921. Synchronous belt; h. Anti-slip wheel groove; S. Injection auxiliary mechanism; s1. Injection transmission seat; s2. Auxiliary cylinder; s3. Accumulator. Detailed Implementation

[0052] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0053] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0058] like Figures 1 to 7 As shown, the injection molding machine of this embodiment includes a base 1, an injection barrel 2, an injection screw 3, a pressure sensor 4, and a power unit D.

[0059] Specifically, the base 1 includes a rear seat body 10 forming a seat cavity and a front seat body 11 that is detachably installed at the front end of the rear seat body 10.

[0060] The injection tube 2 is fixed to the front seat body 11 from the rear end.

[0061] Specifically, the injection barrel 2 includes an injection barrel body 20 that forms a material cavity inside, and an injection nozzle 21 disposed at the front end of the injection barrel body 20, wherein the injection barrel body 20 is provided with a plastic raw material inlet 20a.

[0062] The injection screw 3 extends along the length of the injection barrel 2 and extends into the front seat body 11 from the rear end.

[0063] Pressure sensor 4 is installed inside the rear seat body 10.

[0064] The power unit D is used to drive the injection screw 3 to rotate about its own axis and / or move linearly along its own length.

[0065] Combination Figure 8 and Figure 9 As shown, the power unit D includes a power screw 5, a power sleeve 6, a power shaft 7, a feeding power mechanism 8, an injection power mechanism 9, and an injection auxiliary mechanism S.

[0066] The power screw 5 is concentric with the injection screw 3, and its helix direction is opposite to that of the injection screw 3. This allows for better coordinated movement between the feeding power mechanism 8 and the injection power mechanism 9, reducing the need for different power specifications.

[0067] The power screw sleeve 6 has a threaded engagement hole inside, which engages with the external thread of the power screw 5.

[0068] The power shaft 7 coaxially connects the power sleeve 6 and the injection screw 3 and can rotate around its own axis or move along its own axis. The front end of the power shaft 7 is connected to the rear end of the injection screw 3, and the rear end of the power shaft 7 is rotatably connected to the front end of the power sleeve 6.

[0069] The drive shaft 7 has a connecting hole inside that matches the front end of the drive screw 5. The threaded hole and the connecting hole have the same diameter and are aligned at the center. This facilitates the relative insertion of the front end of the drive screw, shortens the equipment size, and keeps the outer diameter of the drive screw equal.

[0070] The power sleeve 6 and the power shaft 7 are connected by a needle roller bearing g. In this way, the thrust of the needle roller bearing improves the synchronization of the movement of the power sleeve 6 and the power shaft 7.

[0071] The needle roller bearing g is lubricated by oil immersion, and a bearing cover plate b is formed on the outer periphery of the needle roller bearing g.

[0072] Combination Figure 10 As shown, the injection auxiliary mechanism S includes an injection transmission seat s1 sleeved on the outer periphery of the power screw 5, an auxiliary cylinder s2 parallel to the power screw 5 and connected at both ends between the bearing cover plate b and the injection transmission seat s1, an accumulator s3 for controlling the extension and retraction of the auxiliary cylinder s2, and a control valve s4 disposed between the accumulator s3 and the auxiliary cylinder s2. There are two auxiliary cylinders s2, which are evenly distributed around the power screw 5.

[0073] In this example, two auxiliary cylinders s2 are symmetrically arranged on both sides of the power screw 5 and are synchronously extended and retracted. At the same time, the two auxiliary cylinders s2 are also arranged in the seat cavity synchronously with the power sleeve 6.

[0074] The control valve S4 is a solenoid bidirectional shut-off valve, and under the oil circuit control of the solenoid bidirectional shut-off valve, it can implement the auxiliary force provided by the auxiliary cylinder.

[0075] In this example, before the next injection action begins, control valve s4 disconnects the accumulator s3 and the auxiliary cylinder s2.

[0076] The feeding power mechanism 8 includes a feeding power component 80 that drives the power shaft 7 to rotate around its own axis and a braking component 81.

[0077] Specifically, the feeding power component 80 includes a feeding pulley 800 that is aligned with the axis and sleeved on the outer periphery of the power shaft 7, a feeding motor 801 whose output shaft is parallel to the injection screw 3, and a feeding transmission component 802 that drives the output shaft of the feeding motor 801 to the feeding pulley 800.

[0078] A keyway c1 extending along the length of the injection screw 3 is formed on the feeding pulley 800, and a transmission key c2 matching the keyway c1 is fixed on the drive shaft 7. The keyway c1 and the transmission key c2 form a keyway group C (that is, a conventional keyway fit).

[0079] The feeding power component 80 also includes two keyway sets C, which are evenly spaced around the circumference of the power shaft 7. The two keyway sets C ensure the synchronization accuracy of the power shaft 7 and the drive shaft, and provide a limit during linear motion, further reducing the possibility of rotation of the injection screw during linear motion.

[0080] In this example, the feeding pulley 800 is a gear, and the feeding transmission component 802 includes a transmission gear 802a mounted on the output shaft and meshing with the gear. The use of gear meshing avoids pulley slippage and ensures high-precision motion control.

[0081] The brake element 81 is a jaw brake, and the jaw brake is mounted on the output shaft.

[0082] The rear end of the power screw 5 extends out from the rear end of the rear seat body 10.

[0083] The injection power mechanism 9 includes an injection pulley 90 fixed to the rear end of the power screw 5, an injection motor 91 located at the bottom of the rear seat body 10, and an injection transmission component 92 for drivingly connecting the injection motor 91 and the injection pulley 90.

[0084] Specifically, the injection transmission component 92 includes an injection timing pulley 920 disposed on the output shaft of the injection motor 91, and a timing belt 921 that synchronously connects the injection pulley 90 and the injection timing pulley 920.

[0085] In this example, both the injection timing pulley 920 and the injection pulley 90 have anti-slip grooves h on their outer periphery.

[0086] Simultaneously, the power screw 5, power sleeve 6, and power shaft 7 form a ball screw assembly. This enables accurate rotation of the power screw and more stable motion output between the power sleeve and the injection molding screw.

[0087] In this example, the lubrication of the ball screw assembly and the bearings can be achieved by oil immersion, which extends their service life.

[0088] In summary, the injection molding machine of this application operates as follows:

[0089] Injection: The injection motor and accumulator supply oil to the injection auxiliary cylinder. At this time, the jaw brake is engaged. With the cooperation of the keyway mating part, the injection motor drives the power screw to rotate clockwise, realizing the forward movement of the power sleeve and the power shaft (that is, the forward movement of the injection screw).

[0090] Pressure holding: The injection motor and auxiliary hydraulic cylinder work together to maintain a certain pressure.

[0091] Add ingredients:

[0092] State 1: The injection motor drives the power screw to rotate counterclockwise at a speed of N1, the feeding motor drives the power shaft to rotate at a speed of N2, N1=N2, and the screw and power sleeve rotate in place to feed material;

[0093] State 2: When the material is fed to a certain stage in State 1, back pressure is generated. At this time, the speed of the power screw is increased from N1 to N2, the power screw sleeve retracts, and the injection auxiliary cylinder is compressed and stored.

[0094] Repeating states 1 and 2 enables the storage of energy for feeding and compression of the injection auxiliary cylinder.

[0095] Rear Loosening (Anti-Drip): The jaw brake engages, and the injection motor rotates counterclockwise, overcoming the force of the injection auxiliary cylinder to retract the power sleeve.

[0096] At the same time, the accumulator and the injection auxiliary cylinder are disconnected before the next injection action begins.

[0097] Therefore, the injection molding machine of this embodiment has the following advantages:

[0098] 1) On the one hand, this application increases the injection power by providing power through the injection auxiliary mechanism, thereby reducing the power requirements of the injection power mechanism; on the other hand, through the cooperation of the feeding power mechanism, the injection power mechanism, and the injection auxiliary mechanism, and combined with the braking or releasing of the braking components, it can not only store energy during feeding, but also reduce the power requirements of the feeding power mechanism. Therefore, this invention not only reduces the power requirements of injection and feeding, but also facilitates switching between linear and rotational motion.

[0099] 2) The power shaft and the power screw sleeve are connected by a needle roller bearing for relative rotation, and the axial thrust of the needle roller bearing is used to improve the synchronization of the movement of the power screw sleeve and the power shaft. At the same time, the helix direction of the injection screw is opposite to that of the power screw. Combined with the jaw brake and keyway mating part, it is easy to switch between the axial movement and circumferential rotation of the power shaft to implement the injection and feeding action of the injection screw.

[0100] 3) The specifications of the feeding motor and the injection motor have been reduced, and the corresponding drive specifications have also been reduced. Therefore, the motor selection requirements have been greatly reduced, and the manufacturing and operating costs have been reduced.

[0101] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. An injection molding machine, comprising: Base; A plastic injection cylinder includes a cylinder body that forms a material cavity inside and an injection nozzle located at the front end of the cylinder body, wherein the cylinder body is provided with a plastic raw material inlet. The injection screw extends along the length of the injection barrel and extends into the machine base from the rear end; Pressure sensor; A power unit for driving a glue-injecting screw to rotate around its own axis and / or move linearly along its own length, characterized in that the power unit includes a power screw, a power sleeve, a power shaft, a feeding power mechanism, an injection power mechanism, and an injection auxiliary mechanism, wherein the power screw is concentric with the glue-injecting screw and its helix direction is opposite to that of the glue-injecting screw; the power sleeve is threadedly engaged with the power screw; the power shaft coaxially connects the power sleeve and the glue-injecting screw and is capable of rotating around its own axis or moving along its own axis, wherein the front end of the power shaft is connected to the rear end of the glue-injecting screw, and the rear end of the power shaft is rotatably connected to the front end of the power sleeve, and the interior of the power shaft has a connection hole matching the front end of the power screw; the feeding power mechanism includes a feeding power component that drives the power shaft to rotate around its own axis and a braking component. The system includes a braking component that brakes the power component to limit the rotation of the power shaft; an injection power mechanism that drives the power screw to rotate around its own axis; and an injection auxiliary mechanism including multiple auxiliary cylinders, an accumulator, and a control valve that are evenly spaced around and parallel to the power screw. The auxiliary cylinders extend and retract synchronously and move synchronously with the power sleeve. During injection, the injection power mechanism and auxiliary cylinders work synchronously, the braking component brakes the power shaft, the power screw rotates, and the power sleeve, power shaft, and injection screw all advance without rotating to inject plastic raw materials. During pressure holding, the injection power mechanism and auxiliary cylinders work together to maintain the set pressure. During material feeding, the injection power mechanism drives the power screw to rotate in the opposite direction, while the material feeding power component drives the power shaft to rotate in coordination, so that the power screw and power sleeve rotate in place to feed material.

2. The injection molding machine according to claim 1, characterized in that: During feeding, the rotational speed of the power screw is N1, and the rotational speed of the power shaft is N2. When N1 = N2, the power screw and the power sleeve rotate in place to feed; when N1 > N2, the power sleeve retracts, and the auxiliary cylinder compresses and stores energy.

3. The injection molding machine according to claim 1, characterized in that: Before the next injection action begins, the control valve disconnects the accumulator and the auxiliary cylinder.

4. The injection molding machine according to claim 1, characterized in that: The control valve is an electromagnetic two-way shut-off valve.

5. The injection molding machine according to claim 1, characterized in that: The power sleeve and the power shaft are connected by a bearing drive, and a lubricating oil storage cavity is formed inside the base, with the bearing immersed in the lubricating oil storage cavity.

6. The injection molding machine according to claim 5, characterized in that: The bearing is a needle roller bearing.

7. The injection molding machine according to claim 6, characterized in that: A bearing cover plate is formed on the outer periphery of the needle roller bearing, and an injection transmission seat is provided on the outer periphery of the power screw to avoid the movement of the power screw. Multiple auxiliary cylinders are located between the bearing cover plate and the injection transmission seat.

8. The injection molding machine according to claim 1, characterized in that: The power sleeve has a threaded mating hole inside, wherein the diameter of the threaded mating hole and the connecting hole are equal and aligned at the center.

9. The injection molding machine according to claim 1, characterized in that: When the brake is engaged or the anti-flow delay is applied, the braking component is in a braking state, and the injection power mechanism drives the power screw to rotate to overcome the force of the auxiliary cylinder and cause the power sleeve to retract.

10. The injection molding machine according to any one of claims 1 to 9, characterized in that: The feeding power unit includes a feeding pulley aligned with the axis and sleeved on the outer periphery of the power shaft, a feeding motor with an output shaft parallel to the injection screw, a feeding transmission component that drives the output shaft of the feeding motor to the feeding pulley, a braking component disposed on the output shaft and capable of braking the rotation of the feeding pulley, the power shaft and the feeding pulley being able to rotate synchronously, and the power shaft being able to move relative to the feeding pulley along its own length direction.

11. The injection molding machine according to claim 10, characterized in that: A keyway extending along the length of the injection screw is formed on the feeding pulley, and a transmission key matching the keyway is fixedly formed on the drive shaft.

12. The injection molding machine according to claim 11, characterized in that: The keyway and the transmission key form a keyway group, and the feeding power component includes multiple keyway groups, which are evenly spaced around the power shaft in the circumferential direction.

13. The injection molding machine according to claim 1, characterized in that: The ball screw assembly formed by the power screw, the power shaft, and the power sleeve is located within the machine base and is capable of oil immersion lubrication.

14. The injection molding machine according to claim 1, characterized in that: The rear end of the power screw extends out from the rear end of the machine base. The injection power mechanism includes an injection pulley fixed to the rear end of the power screw, an injection motor located at the bottom of the machine base, and an injection transmission component for drivingly connecting the injection motor and the injection pulley.

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