Injection unit for an injection molding machine

Abstract

The application discloses a novel injection device of an injection molding machine, which comprises a glue injection unit, a plunger and a glue injection driving unit. The glue injection unit is provided with a material channel, which has opposite discharging ends and pressure applying ends. The plunger extends into the material channel through the pressure applying ends and is configured to be movable along the material channel. The glue injection driving unit is provided with a movable driving part, which is arranged towards the material channel and used for providing kinetic energy for the plunger and driving the plunger to accelerate to move towards the pressure applying ends. Before the kinetic energy is provided for the plunger, the driving part is switchable between an initial position and an incremental position. When the driving part is switched between the initial position and the incremental position, the pressure applying distance of the driving part is adjusted to adjust the kinetic energy and speed of the driving part applied to the plunger. The kinetic energy and acceleration of the driving part applied to the plunger from the incremental position are greater than those from the initial position. The problems of long glue injection response time and slow glue injection speed are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding machines, in particular to an injection device of an injection molding machine. BACKGROUND

[0002] The existing injection device applied to the injection molding machine fills the mold cavity with the melt and other materials output by the injection. Generally, the existing injection device sets the device for realizing the injection and driving the injection into an integrated structure. When processing materials with high melting points and when applied to high injection speed injection molding machines with certain requirements for injection speed, the injection acceleration needs to be as high as possible to shorten the acceleration stroke of the injection. However, the existing injection device integrating the injection and driving the injection has constant kinetic energy applied to the injection unit, long injection response time, and slow injection speed, which leads to the temperature drop of the melt and other materials before filling the mold cavity, which not only may block the injection, but also affects the actual processing quality and processing efficiency. SUMMARY

[0003] The main purpose of the present application is to provide an injection device of an injection molding machine to solve the problems of long injection response time and slow injection speed.

[0004] To achieve the above purpose, the present application provides an injection device of an injection molding machine, comprising:

[0005] an injection unit, the injection unit is provided with a material channel, the material channel has opposite discharge ends and pressure application ends;

[0006] a plunger, the plunger extends into the material channel through the pressure application end and is configured to be movable along the material channel; and

[0007] an injection driving unit, the injection driving unit has a movable driving part, the driving part is arranged towards the material channel, used to provide kinetic energy for the plunger and drive the plunger to accelerate moving towards the pressure application end;

[0008] Before providing kinetic energy for the plunger, the driving part is switchable between an initial position and an incremental position, when the driving part is switched between the initial position and the incremental position, the driving part is used to adjust the pressure application distance of the driving part to adjust the kinetic energy and speed of the driving part applied to the plunger, the kinetic energy and acceleration of the driving part applied to the plunger from the incremental position are greater than those from the initial position.

[0009] In an embodiment, the plunger is configured to be movable along the material channel between a first position and a second position, wherein:

[0010] When the distance between the initial position and the pressure applying end is taken as the pressure applying distance, the plunger drives the driving part to move to the initial position when moving to the second position, and the driving part remains stationary at the initial position before the plunger is provided with kinetic energy;

[0011] When the distance between the initial position and the pressure applying end is taken as the pressure applying distance, the plunger drives the driving part to move to the initial position when moving to the second position, and the driving part remains stationary at the initial position before the plunger is provided with kinetic energy;

[0012] In an embodiment, the injection device of the injection molding machine further comprises a control unit and a pressure detection assembly, the control unit is electrically connected with the glue injection driving unit and the pressure detection assembly respectively, the pressure detection assembly is arranged on the driving part for detecting the force applied by the plunger on the driving part, and the control unit is configured to control the driving part to move when the force applied by the plunger on the driving part reaches a preset pressure threshold.

[0013] In an embodiment, a feeding position for feeding material is arranged between the discharging end and the pressure applying end of the material channel, and the control unit is configured to control the feeding amount of the feeding position to drive the plunger to move towards the second position.

[0014] In an embodiment, the injection device of the injection molding machine further comprises a mode switching unit, the mode switching unit is configured to input a first mode signal and a second mode signal,

[0015] The control unit is configured to control the feeding amount of the feeding position after receiving the first mode signal, and to control the driving part to provide kinetic energy for the plunger after the driving part moves to the initial position.

[0016] The control unit is further configured to control the feeding amount of the feeding position after receiving the second mode signal, so that the plunger moves to the second position, and to control the driving part to provide kinetic energy for the plunger after the driving part moves to the incremental position.

[0017] In an embodiment, the injection device of the injection molding machine further comprises a glue melting unit, the glue melting unit is configured to feed material, the glue melting unit is connected with the glue injection unit in one body, and the discharging end of the glue melting unit is connected with the feeding position of the glue injection unit.

[0018] In an embodiment, the glue melting unit is arranged above the glue injection unit, the glue melting unit has an inclined downward material injection channel in the middle part, and the material injection channel is communicated between the feeding end and the discharging end of the glue melting unit.

[0019] In an embodiment, the glue melting unit is provided with a heating assembly for melting the material in the glue injection channel.

[0020] In an embodiment, the injection device of the injection molding machine further comprises a nozzle base, the nozzle base comprises a first connecting part, the first connecting part is hollow, and the glue injection unit and the glue injection driving unit are respectively installed at two ends of the first connecting part.

[0021] In an embodiment, the nozzle base further comprises a second connecting part, the second connecting part is supported between the glue melting unit and the glue injection driving unit.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The plunger extends into the material channel of the glue injection unit through the pressing end thereof and is configured to be movable along the material channel, the glue injection driving unit has a movable driving part arranged towards the material channel for providing kinetic energy to the plunger and driving the plunger to accelerate towards the pressing end to drive the material in the material channel to accelerate to the discharge end, so as to increase the glue injection speed; the driving part is arranged towards the material channel to reduce the alignment process; before the kinetic energy is provided to the plunger, the driving part is switchable between an initial position and an incremental position, when the driving part is switched between the initial position and the incremental position, the pressing distance of the driving part is adjusted to adjust the kinetic energy and speed of the driving part applied to the plunger, so as to adjust the acceleration stroke of the glue injection according to the injection requirement, so as to be applicable to the injection molding machines having different requirements for the injection speed, by increasing the pressing distance, the kinetic energy and speed of the driving part applied to the plunger can be increased, and the glue injection response time of the glue injection unit is further reduced, the glue injection speed is increased, the situation that the material is cooled before filling the mold cavity is avoided, and the processing quality and efficiency are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structural schematic diagram of an embodiment of the injection device of the injection molding machine of the present application;

[0026] Figure 2 The implementation schematic diagram of the working in the first mode of an embodiment of the injection device of the injection molding machine of the present application;

[0027] Figure 3An implementation diagram of the working in the second mode of an embodiment of the injection device of the injection molding machine of the present application;

[0028] Figure 4 An implementation diagram of the functional modules of an embodiment of the injection device of the injection molding machine of the present application.

[0029] Brief Description of the Drawings

[0030]

[0031] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] It should be noted that, if all the directionality indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, if the certain posture is changed, the directionality indications are also changed accordingly.

[0034] If the description involving “first”, “second” and the like in the present application is only used for the description purpose, and cannot be understood as indicating or implying the relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features with “first”, “second” can explicitly or implicitly include at least one of the features. If the description involving “A and / or B” in the present application is described, it means that the scheme A or the scheme B is included, or the scheme A and the scheme B are included. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the implementation of the person skilled in the art, when the combination of the technical solutions appears contradictory or unimplementable, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present application.

[0035] The present application provides an injection device of an injection molding machine.

[0036] Reference Figures 1 to 4 The injection device of the injection molding machine at least includes a glue injection unit 100, a plunger 200, a glue injection driving unit 300, a glue melting unit 400, a control unit 600, a pressure detection assembly 700 and a mode switching unit 800. Wherein:

[0037] The injection unit 100 is provided with a material channel 110 having opposite discharge end 1101 and pressure end 1102; the plunger 200 extends into the material channel 110 through the pressure end 1102 and is configured to be movable along the material channel 110. During the movement of the plunger 200 along the material channel 110 towards the discharge end 1101, the material in the material channel 110 is driven to discharge from the discharge end 1101, so that the discharge end 1101 of the injection unit 100 discharges.

[0038] The injection driving unit 300 has a movable driving part 310 arranged towards the material channel 110 for providing kinetic energy to the plunger 200 and driving the plunger 200 to accelerate towards the pressure end 1102. In this way, the alignment process can be reduced, and the material in the material channel 110 is driven to accelerate and discharge from the discharge end 1101, thereby improving the injection speed.

[0039] Optionally, the injection driving unit 300 includes a driving motor 320 and a lead screw 311, and the driving part 310 is arranged on the lead screw 311, and the driving motor 320 is drivingly connected with the lead screw 311 for driving the driving part 310 to move.

[0040] The driving motor 320 is drivingly connected with the lead screw 311 for converting the rotation of the belt wheel into linear motion to drive the driving part 310 to move. Before providing kinetic energy to the plunger 200, the driving part 310 is switchable between an initial position and an incremental position. When the driving part 310 is switched between the initial position and the incremental position, the pressure distance of the driving part 310 is adjusted to adjust the kinetic energy and speed of the driving part 310 applied to the plunger 200. The kinetic energy and acceleration of the driving part 310 applied to the plunger 200 from the incremental position are greater than those from the initial position.

[0041] According to the injection requirement, the acceleration stroke of the injection is adjusted by adjusting the pressure distance of the driving part 310, so as to be suitable for injection molding machines with different requirements for injection speed. By increasing the pressure distance, the kinetic energy and speed of the driving part 310 applied to the plunger 200 can be increased, and the injection response time of the injection unit 100 can be further reduced, the injection speed can be improved, the situation that the melt is cooled before filling the mold cavity can be avoided, and the processing quality and efficiency can be effectively improved.

[0042] It should be noted that the initial position and the incremental position of the driving part 310 are determined according to the maximum stroke of the driving part 310 in the initial state, and the position of the driving part 310 in the initial state or after completing the last injection is taken as the initial position of the driving part 310, and the initial position is the position of the driving part 310 closest to the injection device in the initial state; and the incremental position is the position of the driving part 310 farthest away from the injection device in the initial state, and the pressing distance of the driving part 310 is the largest in the incremental position. The initial position and the incremental position can be adjusted and changed according to actual processing needs, and the specific adjustment can be made according to actual settings, which are not limited here.

[0043] As a specific example, before the plunger 200 is provided with kinetic energy, the driving part 310 can be switched between the initial position and the incremental position. Wherein:

[0044] Before the plunger 200 is provided with kinetic energy, if the driving part 310 is in the initial position, the driving part 310 accelerates to push the plunger 200, so that the material in the material channel 110 is ejected. Because the plunger 200 moves under the driving of the driving part 310, the molten material and the like ejected from the material channel 110 can fill the mold cavity or the runner in a manner of accelerating from a low injection speed to a high injection speed. This injection method can be used in processing technologies such as long-runner thin-wall product injection molding.

[0045] Before the plunger 200 is provided with kinetic energy, if the driving part 310 is in the incremental position, the driving part 310 will apply a greater kinetic energy and a faster speed to the plunger 200. In this case, because the impulse is large, the driving part 310 will directly impact on the plunger 200, and the plunger 200 will accelerate to move along the material channel 110 towards the discharge end 1101 after being impacted, so that the material in the material channel 110 is quickly ejected. The molten material and the like ejected from the material channel 110 can quickly and high-response fill the mold cavity or the runner. This injection method can be used in processing technologies such as hot-runner thin-wall product injection molding.

[0046] It should be noted that the plunger 200 is movably arranged in the material channel 110, and to adjust the pressing distance, the glue injection driving unit 300 and the glue injection unit 100 can be independently arranged, and the glue injection driving unit 300 and the glue injection unit 100 can be independently arranged at different positions; or a sleeve or other connecting device can be arranged, and the glue injection driving unit 300 and the glue injection unit 100 are separately arranged at different positions of the connecting device, and the driving part 310 and the plunger 200 are reserved with a pressing distance.

[0047] The plunger 200 can be pushed to move towards the injection driving unit 300 in a direction away from the material channel 110. As an example, the driving position of the driving part 310 is the position where the driving part 310 is closest to the material channel 110. Before the plunger 200 is provided with kinetic energy, the driving part 310 can be switched between an initial position and an incremental position. If the pressing distance does not need to be increased, the driving part 310 is set to remain in the initial position, and the interval between the initial position and the driving position is set as the pressing distance. If the pressing distance needs to be increased, the driving part 310 is set to move towards the incremental position or directly move to the incremental position, and the interval between the position of the driving part 310 after adjustment and the driving position is set as the pressing distance.

[0048] Alternatively, the pressing end 1102 of the material channel 110 is the driving position, and the pressing end 1102 of the material channel 110 is the position where the driving part 310 is closest to the material channel 110.

[0049] In an embodiment, the plunger 200 is configured to be movable along the material channel 110 between a first position and a second position. It should be noted that the first position and the second position are determined according to the maximum stroke of the plunger 200 along the material channel 110. The first position is the position where the plunger 200 is closest to the material channel 110, and the first position is the position of the plunger 200 before the material is injected into the material channel 110 and the position where the plunger 200 is closest to the material channel 110 when the driving part 310 drives. The second position is the position where the plunger 200 is closest to the injection driving unit 300. The first position and the second position can be adjusted according to actual processing needs, and specific adjustments are not limited herein.

[0050] To simplify the operation process and improve the injection efficiency, two or more injection modes with different driving speeds can be set according to the initial position and the incremental position. Among them:

[0051] When the interval between the initial position and the pressing end is set as the pressing distance, the plunger is controlled to move by controlling the injection, and the driving part is further driven to move by the plunger. When the plunger moves to the second position, the driving part is driven to move to the initial position. Before the plunger is provided with kinetic energy, the plunger is controlled to remain in the second position by stopping the injection, and the driving part is controlled to remain in the initial position.

[0052] When the distance between the incremental position and the pressing end is taken as the pressing distance, the plunger is controlled to move by means of injection and the like, and the driving part is further driven to move by the plunger. When the plunger moves to the second position, the driving part is driven to move to the initial position. Before the plunger is provided with kinetic energy, the plunger is controlled to remain in the second position by means of stopping injection and the like. Then, the driving part is controlled to move from the initial position to the incremental position in a direction away from the pressing end.

[0053] In addition, according to actual conditions, the kinetic energy and speed of the driving part 310 applied to the plunger 200 can also be controlled by controlling the movement amount of the plunger 200, so that the plunger 200 drives the melt and the like to be discharged from the discharge end 1101 at a greater speed when the plunger 200 is away from the discharge end 1101 of the material channel 110 or the material in the material channel 110 is more. Specifically, the movement amount of the plunger 200 can be controlled by controlling the amount of material injected into the material channel 110 (or directly by controlling the movement amount of the plunger 200), and the pressing distance of the driving part 310 is further adjusted. In order to simplify the operation process and improve the injection efficiency, the pressing distance of the driving part 310 can be adjusted according to the kinetic energy required to be applied to the plunger 200, and two or other multiple injection modes with different driving speeds are set. Among them:

[0054] When the plunger 200 cannot move to the second position or the force applied to the driving part after moving to the second position is less than the preset pressure threshold, the driving part 310 is controlled to remain stationary at the initial position, and the distance between the initial position and the pressing end 1102 is taken as the pressing distance.

[0055] When the force applied to the driving part after the plunger 200 moves to the second position reaches the preset pressure threshold, the driving part 310 is controlled to move from the initial position to the incremental position in a direction away from the pressing end 1102, and the distance between the incremental position and the pressing end 1102 is taken as the pressing distance.

[0056] If the plunger 200 cannot move to the second position or the force applied to the driving part after moving to the second position is less than the preset pressure threshold, the initial position is used as the position of the driving part 310 before providing kinetic energy to the plunger by default. Specifically, when the injection device of the injection molding machine is started for the first time, the driving part 310 remains in the initial position. If the plunger 200 cannot move to the second position or the force applied to the driving part after moving to the second position is less than the preset pressure threshold, the control stops the glue injection, and the initial position is used as the position of the driving part 310 before providing kinetic energy to the plunger by default. Before completing the last injection and starting the next injection, the plunger 200 remains in the first position, and the driving part 310 remains in the driving position. The glue injection unit 400 is controlled by the control unit 600 to move the plunger 200 towards the pressing end 1102 by the material in the material channel 110. If the plunger 200 cannot move to the second position or the force applied to the driving part after moving to the second position is less than the preset pressure threshold, the control stops the glue injection, and the distance between the position of the driving part 310 pushed by the plunger 200 and the driving position is used as the pressing distance. Alternatively, the driving part 310 is controlled to continue moving to the initial position, and the driving part 310 is controlled to remain in the initial position before providing kinetic energy to the plunger. The distance between the initial position and the pressing end 1102 is used as the pressing distance.

[0057] If the force applied to the driving part after the plunger 200 moves to the second position can still reach the preset pressure threshold, the plunger 200 is controlled to remain in the second position by stopping the glue injection, and the driving part 310 is controlled to move from the initial position to the incremental position in a direction away from the pressing end 1102.

[0058] For the convenience of regulation and control and to improve the regulation and control efficiency, in an embodiment, the control unit 600 presets the pressure threshold, the control unit 600 is electrically connected with the glue injection driving unit 300 and the pressure detection assembly 700, the pressure detection assembly 700 is arranged at the driving part 310 or other positions of the glue injection driving unit, and is used to detect the force applied to the driving part 310 by the plunger 200. The control unit 600 is used to control the movement of the driving part 310 when the force applied to the driving part 310 by the plunger 200 reaches the preset pressure threshold.

[0059] The pressure detection assembly 700 such as a pressure sensor is used to detect the back pressure (i.e. the force applied to the driving part 310 by the plunger 200). The material in the material channel 110 of the glue injection unit 100 is injected to push the plunger 200 to move towards the glue injection driving unit 300 in a direction away from the discharge end 1101 of the material channel 110.

[0060] It should be noted that the preset pressure threshold can be 0 or any value greater than 0. If the preset pressure threshold is 0, the plunger 200 directly pushes the driving part 310 to move towards the glue injection driving unit 300 during the glue injection process. If the preset pressure threshold is greater than 0, the plunger 200 is pushed by the material in the material channel 110 to move towards the pressure applying end 1102 during the glue injection process, and the driving part 310 is controlled to move towards the glue injection driving unit 300 when the force applied by the plunger 200 to the driving part 310 reaches the preset pressure threshold. In this process, the force applied by the plunger 200 to the driving part 310 needs to be not less than the preset pressure threshold to drive the driving part 310 to move.

[0061] Specifically, the force applied by the plunger 200 to the driving part 310 can be controlled by controlling the amount of material entering the material channel 110, and the kinetic energy and speed of the driving part 310 applied to the plunger 200 can be further adjusted by adjusting the pressure applying distance.

[0062] In an embodiment, the material channel 110 is provided with a feeding position 120 for material injection between the discharge end 1101 and the pressure applying end 1102, and the control unit 600 is configured to control the feeding amount of the feeding position 120 to drive the plunger 200 to move towards the second position.

[0063] Optionally, the feeding position 120 is arranged close to the discharge end 1101, and the plunger 200 is configured to be movable along the material channel 110 between the first position and the second position. The plunger 200 is arranged close to the feeding position when it is in the first position, and the plunger 200 is driven to move towards the glue injection driving unit by the material in the material channel 110 through the feeding position 120. The plunger 200 is driven to move towards the second position by controlling the feeding amount of the feeding position 120.

[0064] Optionally, the control unit 600 can control to stop injecting material after the plunger 200 moves to the second position. Specifically, the actual setting can be used, which is not limited here.

[0065] In an embodiment, the mode switching unit 800 of the injection device of the injection molding machine is configured to input a first mode signal and a second mode signal,

[0066] The control unit 600 is configured to control the feeding amount of the feeding position 120 after receiving the first mode signal, and to control the driving part 310 to provide kinetic energy to the plunger 200 after the driving part 310 moves to the initial position (i.e., the plunger 200 moves to the second position).

[0067] The control unit 600 is further configured to control the feeding amount of the feeding position 120 to move the plunger 200 to the second position after receiving the second mode signal, and to control the driving part 310 to move from the initial position, and to control the driving part 310 to provide kinetic energy to the plunger 200 after the driving part 310 moves to the incremental position.

[0068] The control unit 600 is electrically connected with the glue injection driving unit 300 and the mode switching unit 800, for controlling the feeding amount according to the received mode signal, and adjusting the kinetic energy provided by the driving part 310 to the plunger 200 by controlling the moving amount of the driving part 310.

[0069] It should be noted that the initial acceleration of the driving part 310 when starting to move at the initial position or the incremental position can be the same or different by adjusting the kinetic energy and speed applied to the plunger 200, which can be set according to actual conditions and is not limited here.

[0070] Optionally, the mode switching unit 800 can be set as an input device such as an operation button, a keyboard, a touch device, etc., and can also be any device suitable for inputting and switching mode signals, which can be set according to actual conditions and is not limited here.

[0071] In an embodiment, the glue melting unit 400 of the injection device of the injection molding machine is used to supply the material to be injected, and the glue melting unit 400 is connected with the glue injection unit 100 as a whole, and the discharging end 4102 of the glue melting unit 400 is connected with the feeding position 120 of the glue injection unit 100.

[0072] Further, the control unit 600 is connected with the glue melting unit 400, for controlling the feeding amount of the glue melting unit 400 into the glue injection unit 100 according to the received mode signal, and controlling the glue melting unit 400 to stop feeding when the plunger 200 moves to the second position, i.e., controlling the glue melting unit 400 to seal the glue.

[0073] As a specific example, the control unit 600 is used to obtain the position of the driving part 310, and is also used to receive the force applied by the plunger 200 to the driving part 310 detected by the pressure detection assembly 700. Since the driving part 310 is synchronized with the movement of the plunger 200 before moving to the initial position, the position of the plunger 200 can be further obtained according to the detected position of the driving part 310. Optionally, the glue injection driving unit 300 is provided with a position detection assembly, a magnetic switch or other detection device, for detecting the position of the driving part 310 and feeding the position of the driving part 310 to the control unit 600. The control unit 600 is connected with the glue melting unit 400, for controlling the feeding amount of the glue melting unit 400 into the glue injection unit 100 according to the received mode signal.

[0074] When the injection device of the injection molding machine is started for the first time, the driving part 310 is kept at the initial position. If the first mode signal is received, the control unit 600 is configured to determine whether the plunger 200 moves to the second position according to the force applied by the plunger 200 to the driving part 310 detected by the pressure detection assembly 700, and to control the molten glue unit 400 to stop feeding when the plunger 200 moves to the second position. If the second mode signal is received, the control unit 600 is configured to control the molten glue unit 400 to stop feeding when the plunger 200 moves to the second position, to control the plunger 200 to stop moving, and further to control the driving part 310 to move to the incremental position.

[0075] When the last injection is completed and the next injection is started, the plunger 200 is kept at the first position, and the driving part 310 is kept at the driving position such as the pressing end 1102. If the first mode signal is received, the control unit 600 controls the molten glue unit 400 to feed, and controls the molten glue unit 400 to stop feeding when the plunger 200 moves to the second position. If the second mode signal is received, the control unit 600 is configured to control the molten glue unit 400 to stop feeding when the plunger 200 moves to the second position, to control the plunger 200 to stop moving, and further to control the driving part 310 to move to the incremental position.

[0076] As another specific example, if the first mode signal is received, the control unit 600 is configured to control the molten glue unit 400 to stop feeding after the feeding amount reaches the preset feeding amount. If the second mode signal is received, the control unit 600 is configured to control the molten glue unit 400 to stop feeding when the plunger 200 moves to the second position, or when the force applied by the plunger 200 to the driving part 310 reaches the preset pressure value. In addition, the preset feeding mode of the molten glue unit 400 can be set, and the control unit 600 is configured to control the molten glue unit 400 to execute the first feeding mode after receiving the first mode signal. The molten glue unit 400 executing the first feeding mode is configured to stop feeding after the feeding amount reaches the first feeding amount, the first feeding amount is equal to the preset feeding amount, and the plunger 200 moves to the second position when the feeding amount reaches the first feeding amount, and the driving part 310 is kept at the initial position before the plunger is provided with kinetic energy. The molten glue unit 400 executing the second feeding mode is configured to stop feeding after the feeding amount reaches the second feeding amount, the plunger 200 moves to the second position when the feeding amount reaches the second feeding amount, and abuts against the driving part 310, the driving part 310 is controlled to move from the initial position to the incremental position in a direction away from the pressing end 1102, and the driving part 310 is kept at the incremental position before the plunger is provided with kinetic energy. The feeding can be controlled according to actual conditions, which is not limited here.

[0077] In an embodiment, the glue melting unit 400 is arranged above the glue injecting unit 100, and the glue melting unit 400 is provided with a glue injecting channel 410 arranged obliquely downward in the middle of the glue melting unit 400, and the glue injecting channel 410 is communicated between the feeding end 4101 and the discharging end 4102 of the glue melting unit 400.

[0078] The glue injecting channel 410 of the glue melting unit 400 is arranged obliquely downward and is arranged towards the feeding position 120 of the glue injecting unit 100 for feeding. Optionally, the glue melting unit 400 comprises a glue melting device, a glue melting device driving unit 420 and a glue melting screw 430, the glue melting device is provided with opposite first and second ends, the discharging end 4102 of the glue melting unit 400 is arranged at the first end of the glue melting device and is arranged close to the feeding position 120 of the glue injecting unit 100, and the feeding end 4101 of the glue melting unit 400 is arranged at the second end of the glue melting device. The glue melting device driving unit 420 is arranged at the second end of the glue melting device and is drivingly connected with the glue melting screw 430 extending into the glue injecting channel 410, for sending the material in the glue injecting channel 410 out of the discharging end 4102 and injecting the material into the material channel 110 through the feeding position 120.

[0079] Optionally, a feeding channel is arranged between the discharging end 4102 of the glue melting unit 400 and the material channel 110, the feeding channel comprises a first feeding channel 121 arranged at the discharging end 4102 of the glue melting unit 400 and a second feeding channel 411 arranged at the material channel 110, the second feeding channel is used for communicating the feeding position 120 of the glue injecting unit 100 and the material channel 110, and the first feeding channel 121 is used for communicating the discharging end 4102 of the glue melting unit 400 and the second feeding channel 411, so as to facilitate the injection of the material from the discharging end 4102 of the glue melting unit 400 into the feeding position 120 of the material channel 110. The pipeline, position and connection angle of the first feeding channel 121 and the second feeding channel 411 can be adjusted according to the positions of the glue melting unit 400 and the glue injecting unit 100, and the actual arrangement is not limited herein.

[0080] Further, for facilitating the processing, the glue injecting unit 100 is arranged to comprise a first connecting section 131 and a second connecting section 132 connected in sequence, and the material channel 110 is arranged to pass through the first connecting section 131 and the second connecting section 132, the discharging end 4102 of the glue injecting unit 100 is arranged at the first connecting section 131, and the pressing end 1102 is arranged at the second connecting section 132, the material channel 110 is divided into a first material channel and a second material channel corresponding to the first connecting section 131 and the second connecting section 132, the inner diameter of the first material channel is smaller than the inner diameter of the second material channel, the outer diameter of the plunger 200 is smaller than the inner diameter of the second material channel and is larger than the inner diameter of the first material channel, and the first feeding channel 121 is connected with the second material channel or is connected between the first material channel and the second material channel. The actual arrangement is not limited herein.

[0081] Further, the included angle between the material channel 110 and the injection channel 410 is 10°-80°, and specifically, the included angle between the material channel 110 and the injection channel 410 can be set to 30°, 45°, 60° or any other angle suitable for actual use, which is not limited herein.

[0082] In an embodiment, the glue melting unit 400 is provided with a heating assembly for melting the material in the injection channel 410. In this way, the space occupied by the heating assembly can be reduced, and the situation that the melt or other materials are cooled before filling the mold cavity can be avoided, thereby effectively improving the processing quality and efficiency.

[0083] Optionally, the heating assembly can be a heating pipe, a heating plate or other heating structure, and the heating assembly is arranged in the glue melting unit 400 and close to the discharge end 4102 of the injection channel 410. The specific heating assembly and the position of the heating assembly can be selected according to actual conditions, which is not limited herein.

[0084] In an embodiment, the injection device of the injection molding machine further comprises a shooting platform 500, and the shooting platform 500 comprises a first connecting portion 510, and the first connecting portion 510 is hollow, and the glue injection unit 100 and the glue injection driving unit 300 are respectively arranged at two ends of the first connecting portion 510.

[0085] The first connecting portion 510 is arranged to reduce the alignment process of the glue injection driving unit 300 and the glue injection unit 100, and to a certain extent, the plunger 200 and the driving portion 310 can also be protected from the external environment during the driving of the glue injection. Optionally, the first connecting portion 510 is provided with a connecting structure 511 for positioning and mounting the glue injection unit 100.

[0086] Further, in an embodiment, the shooting platform 500 further comprises a second connecting portion 520, and the second connecting portion 520 is supported between the glue melting unit 400 and the glue injection driving unit 300.

[0087] The shooting platform 500 is arranged between the first connecting portion 510 and the glue melting unit 400, and the second connecting portion 520 is arranged to make the injection device of the injection molding machine as a whole, to make the overall structure more stable, to facilitate the transfer and transportation of the injection device of the injection molding machine, and to facilitate the control of the glue melting, the driving of the glue injection and the glue injection process.

[0088] The embodiments of the present application are as follows:

[0089] Referring to Figure 2When the first mode is executed, the glue injection unit 300 can make the glue injection unit 100 inject glue by contacting and pushing the plunger 200. Specifically, the control unit 600 is configured to control the glue injection unit 400 to inject a certain amount of material into the material channel 110, control the glue injection unit 400 to stop injecting material after the driving part 310 moves to the initial position, and control the driving part 310 at the initial position to accelerate the plunger 200 to make the material in the material channel 110 be injected out. Because the plunger 200 is accelerated by the driving part 310, the material such as the melt in the material channel 110 is filled into the mold cavity or the runner at a low injection speed and then accelerated to a high injection speed.

[0090] After the injection is completed, the plunger 200 and the driving part 310 remain at the current position. When the next injection is executed, the control unit 600 controls the glue injection unit 400 to inject glue, the plunger 200 is pushed by the material in the material channel 110 to move towards the pressure end 1102, the force of the plunger 200 on the driving part 310 is detected by the pressure detection assembly 700 during the movement of the plunger 200 towards the pressure end 1102. If the preset pressure threshold is 0, the driving part 310 is directly pushed by the plunger 200 to move towards the glue injection driving unit 300 until the driving part 310 moves to the initial position (when the driving part 310 moves to the initial position, the plunger 200 moves to the second position), the glue injection is stopped, and the driving part 310 remains at the initial position before the plunger 200 is provided with kinetic energy. If the preset pressure threshold is greater than 0, the plunger 200 is pushed by the material in the material channel 110 to move towards the pressure end 1102, when the force of the plunger 200 on the driving part 310 reaches the preset pressure threshold, the driving part 310 is controlled to move towards the glue injection driving unit 300 until the driving part 310 moves to the initial position (when the driving part 310 moves to the initial position, the plunger 200 moves to the second position), the glue injection is stopped, and the driving part 310 remains at the initial position before the plunger 200 is provided with kinetic energy. Alternatively, in this process, the force of the plunger 200 on the driving part 310 needs to be greater than or equal to the preset pressure threshold to drive the driving part 310 to move, otherwise, the driving part 310 remains stationary.

[0091] This injection method can be used in processing technologies such as injection molding of long-runner thin-wall products.

[0092] Reference Figure 3When the second mode is executed, the glue injection driving unit 300 can make the glue injection unit 100 inject glue by impacting the plunger 200. Specifically, the control unit 600 is configured to control the glue injection unit 400 to inject a certain amount of material into the material channel 110, control the glue injection unit 400 to stop injecting material after the driving part 310 moves to the initial position, control the driving part 310 to move from the initial position to the incremental position in a direction away from the pressing end 1102, and then control the driving part 310 in the incremental position to accelerate towards the pressing end 1102 and directly impact the plunger 200. After the plunger 200 is impacted, it accelerates towards the discharge end 1101 along the material channel 110 to quickly inject the material in the material channel 110. The material such as the melt injected from the material channel 110 can quickly and responsively fill the mold cavity or the flow channel.

[0093] After the completion of the injection, the plunger 200 and the driving part 310 remain in the current position. When the next injection is executed, the control unit 600 controls the glue injection unit 400 to inject glue, and the material injected into the material channel 110 pushes the plunger 200 towards the pressing end 1102. During the movement of the plunger 200 towards the pressing end 1102, the pressure detection assembly 700 detects the force applied by the plunger 200 to the driving part 310. If the preset pressure threshold is 0, the driving part 310 is directly pushed by the plunger 200 towards the glue injection driving unit 300 until the driving part 310 moves to the initial position (when the driving part 310 moves to the initial position, the plunger 200 moves to the second position), and the injection is stopped. Then, the driving part 310 is controlled to move from the initial position to the incremental position in a direction away from the pressing end 1102. Before the plunger 200 is provided with kinetic energy, the driving part 310 remains in the incremental position. If the preset pressure threshold is greater than 0, the plunger 200 is pushed by the material injected into the material channel 110 towards the pressing end 1102. When the force applied by the plunger 200 to the driving part 310 reaches the preset pressure threshold, the driving part 310 is controlled to move towards the glue injection driving unit 300 until the driving part 310 moves to the initial position (when the driving part 310 moves to the initial position, the plunger 200 moves to the second position), and the injection is stopped. Then, the driving part 310 is controlled to move from the initial position to the incremental position in a direction away from the pressing end 1102. Before the plunger 200 is provided with kinetic energy, the driving part 310 remains in the incremental position. Alternatively, during this process, the force applied by the plunger 200 to the driving part 310 needs to be not less than the preset pressure threshold to drive the driving part 310 to move, otherwise, the driving part 310 remains in the incremental position.

[0094] This injection method can be used in processing technologies such as hot runner thin-walled product injection molding.

[0095] It should be noted that the injection device of the injection molding machine shown in the present application can be provided with only any one of the first execution mode and the second execution mode, or can be provided with both the first execution mode and the second execution mode, and the corresponding adjustment of the glue injection unit 100, the plunger 200 and the glue injection driving unit 300 and other component structures, which can be specifically set according to the actual setting, and is not limited here.

[0096] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by utilizing the content of the present application specification and drawings, or direct / indirect application in other related technical fields under the inventive concept of the present application is included in the patent protection scope of the present application.

Claims

1. An injection unit for an injection molding machine, characterized in that, The injection device comprises: a shooting unit provided with a material channel having opposite discharge end and pressure end; a plunger which extends into the material channel through the pressure end and is configured to be movable along the material channel; a shooting drive unit having a movable drive part which is arranged towards the material channel for providing kinetic energy to the plunger and driving the plunger to accelerate towards the pressure end; the drive part is switchable between an initial position and an incremental position before providing kinetic energy to the plunger, the drive part is used to adjust the pressure distance of the drive part when switched between the initial position and the incremental position, so as to adjust the kinetic energy and speed of the drive part applied to the plunger, the kinetic energy and acceleration of the drive part applied to the plunger from the incremental position is greater than that from the initial position; the plunger is configured to be movable along the material channel between a first position and a second position, wherein: when the distance between the initial position and the pressure end is taken as the pressure distance, the plunger drives the drive part to move to the initial position when moving to the second position, and the drive part remains stationary at the initial position before providing kinetic energy to the plunger; when the distance between the incremental position and the pressure end is taken as the pressure distance, the plunger drives the drive part to move to the initial position when moving to the second position, and the drive part is controlled to move from the initial position to the incremental position in a direction away from the pressure end before providing kinetic energy to the plunger; the injection device of the injection molding machine further comprises a control unit and a pressure detection assembly, the control unit is electrically connected with the shooting drive unit and the pressure detection assembly respectively, the pressure detection assembly is arranged on the drive part for detecting the force applied by the plunger to the drive part, and the control unit is used to control the drive part to move when the force applied by the plunger to the drive part reaches a preset pressure threshold; if the preset pressure threshold is 0, the plunger pushes the drive part towards the shooting drive unit during the injection process; if the preset pressure threshold is greater than 0, the plunger is pushed towards the pressure end by the material injected into the material channel during the injection process, and the drive part is controlled to move towards the shooting drive unit when the force applied by the plunger to the drive part reaches the preset pressure threshold. A feeding position for injecting material is arranged between the discharge end and the pressure end of the material channel, and the control unit is used to control the feeding amount of the feeding position to drive the plunger to move towards the second position.

2. The injection unit of claim 1 wherein, The injection device of the injection molding machine further comprises a mode switching unit for inputting a first mode signal and a second mode signal, 3. The injection unit of claim 2 wherein, the control unit is used to control the feeding amount of the feeding position after receiving the first mode signal, and to control the drive part to provide kinetic energy to the plunger after the drive part moves to the initial position; ​ The control unit is further configured to control the feeding amount of the feeding position after receiving the second mode signal, so that the plunger moves to the second position, and to control the driving part to provide kinetic energy for the plunger after the driving part moves to the incremental position.

4. Injection unit for an injection molding machine according to any one of claims 1 to 3, characterized in that The injection device of the injection molding machine further comprises a glue melting unit for injecting material, the glue melting unit is connected with the glue injecting unit as a whole, and the discharge end of the glue melting unit is connected with the feeding position of the glue injecting unit.

5. The injection apparatus of claim 4, wherein, The glue melting unit is arranged above the glue injecting unit, the middle part of the glue melting unit is provided with an injection channel arranged obliquely downward, and the injection channel is communicated between the feeding end and the discharge end of the glue melting unit.

6. The injection apparatus of claim 5, wherein, The glue melting unit is provided with a heating assembly for melting the material in the injection channel.

7. The injection unit of claim 4 wherein, The injection device of the injection molding machine further comprises a glue injecting base, the glue injecting base comprises a first connecting part, the first connecting part is hollow, and the glue injecting unit and the glue injecting driving unit are respectively installed at two ends of the first connecting part.

8. The injection unit of claim 7 wherein, The glue injecting base further comprises a second connecting part, and the second connecting part is supported between the glue melting unit and the glue injecting driving unit.

Images