High-pressure injection molding device

Abstract

The utility model discloses a high-pressure ejection injection molding device which comprises a rack, an injection molding die holder and a sliding rail, the injection assembly comprises an injection support, a pushing support, a heating cylinder, an extrusion pipe, a screw, a motor and a first translation driving mechanism, the injection support and the pushing support are both slidably connected to the sliding rail, the heating cylinder is connected to the injection support, the extrusion pipe is slidably connected into the heating cylinder, the screw is rotatably connected into the extrusion pipe, one end of the heating cylinder is connected with an injection head, and the other end of the heating cylinder is connected with a second translation driving mechanism; the screw rod is connected to the motor, the motor is connected to the pushing support, the pushing support is connected to the first translation driving mechanism, and the first translation driving mechanism is connected to the injection support; and the positioning assembly comprises two second translation driving mechanisms, and the two ends of each second translation driving mechanism are connected with the injection mold base and the injection support correspondingly. According to the utility model, the injection pressure can be obviously increased, the injection filling effect is complete and uniform, the injection molding effect is good, and the qualification rate of injection products is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of injection molding equipment, in particular to an injection molding device of high pressure injection. BACKGROUND

[0002] Injection molding is mainly to make various shapes of plastic products by using plastic forming mold of thermoplastic or thermosetting plastic. Injection is to inject the molten plastic into the mold cavity after heating the thermoplastic to melt, and the molten plastic is cooled and formed in the mold cavity to obtain the injection molding product.

[0003] The injection molding machine is mainly composed of an injection system, a mold clamping system, a hydraulic system and an electrical control system. The injection system is also called an injection machine or an injection device. The molten plastic is injected into the mold cavity through the injection device. In the related art, the injection device drives the screw to rotate in the barrel by the motor to push the molten plastic to be injected forward. This structure has the problem of insufficient injection pressure, which will directly affect the quality of the product, especially for the injection molding structure with complex structure, the qualified rate of the injection molding product is low. SUMMARY

[0004] The utility model discloses at least solve one of the technical problems in the prior art. Therefore, the utility model provides an injection molding device of high pressure injection, and the injection molding pressure is high, the injection molding filling effect is good, and the qualified rate of the injection molding product is high.

[0005] According to the injection molding device of high pressure injection of the utility model embodiment, comprising:

[0006] The rack is provided with an injection mold base and a sliding rail;

[0007] The injection assembly comprises an injection support, a push support, a heating cylinder, an extrusion pipe, a screw, a motor and a first translation driving mechanism. The injection support and the push support are both slidingly connected to the sliding rail. The push support is located on the side of the injection support away from the injection mold base. The heating cylinder is connected to the injection support. The extrusion pipe is slidingly connected to the heating cylinder. The screw is rotationally connected to the extrusion pipe. One end of the heating cylinder is connected with an injection head. The end of the screw away from the injection head is connected to the motor. The motor is connected to the push support. The push support is connected to the first translation driving mechanism. The first translation driving mechanism is connected to the injection support.

[0008] The positioning assembly comprises two second translation driving mechanisms which are symmetrically arranged about the center of the heating cylinder. The two ends of the second translation driving mechanism are respectively connected to the injection mold base and the injection support.

[0009] In the embodiment, the positioning assembly further comprises two hinges. Each second translation driving mechanism is hingedly connected to the injection mold base through the corresponding hinge.

[0010] In the embodiment, the two second translation driving mechanisms are respectively located above and below the horizontal plane where the heating cylinder is located, the rotation axis of the hinge is perpendicular to the slide rail, and the rotation axis of the hinge is parallel to the horizontal plane.

[0011] In the embodiment, the injection assembly further comprises at least two guide columns, one end of each guide column is connected to the pushing support, the injection support is provided with a plurality of guide sleeves matched with the guide columns, and the guide columns are slidingly connected in the guide sleeves.

[0012] In the embodiment, the heating cylinder comprises an injection tube and a heater, and the heater is connected outside the injection tube.

[0013] In the embodiment, the top of the injection tube is connected with a feeding pipe, and the top of the extrusion pipe is provided with a feeding port for connecting the feeding pipe.

[0014] In the embodiment, the first translation driving mechanism and the second translation driving mechanism are both oil cylinders.

[0015] In the embodiment, the side of the injection mold base close to the injection support is provided with a clearance groove.

[0016] The embodiment of the utility model has at least the following beneficial effects:

[0017] The stable extrusion injection of the molten plastic material is realized by the mode that the motor drives the screw rod to rotate, after the molten plastic in the extrusion pipe is extruded and pushed to the injection head by the screw rod, the first translation driving mechanism can drive the extrusion pipe and the screw rod to synchronously advance close to the injection head, the injection pressure can be obviously increased, the molten plastic shot out of the injection head can be ensured to completely fill each region of the mold cavity, the injection filling effect is complete and uniform, the injection molding effect is good, and the qualified rate of the injection product is high, the accurate alignment between the injection assembly and the injection mold base is realized through the two second translation driving mechanisms symmetrical about the central axis of the heating cylinder, the accurate alignment between the injection assembly and the mold is ensured, and the qualified rate of the injection product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0019] Figure 1 It is a perspective structural schematic view of the injection molding device of the utility model embodiment high pressure shot;

[0020] Figure 2 It is a perspective structural schematic view of the injection molding device of the utility model embodiment high pressure shot from another visual angle;

[0021] Figure 3 It is a top view structural schematic view of the injection molding device of the utility model embodiment high pressure shot;

[0022] Figure 4 The injection device of the embodiment of the utility model is high-pressure injection along Figure 3 The cross-sectional structure schematic view of A-A' in the middle;

[0023] Figure 5 The injection device of the embodiment of the utility model is high-pressure injection along Figure 3 The cross-sectional structure schematic view of A-A' in the middle.

[0024] Reference signs:

[0025] Frame 100, injection mold base 110, let go of the slot 111, slide rail 120;

[0026] Injection assembly 200, injection support 210, guide sleeve 211, push support 220, heating cylinder 230, injection tube 231, heater 232, feeding tube 233, extrusion tube 240, feed inlet 241, screw 250, motor 260, first translation driving mechanism 270, injection head 280, guide column 290;

[0027] Positioning assembly 300, second translation driving mechanism 310, hinge 320. DETAILED DESCRIPTION

[0028] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0029] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, left, right, front, back, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0030] In the description of the utility model, if there is a description of a wire sleeve, a support is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0031] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0032] Injection molding is a process of shaping thermoplastic or thermosetting plastics into various shapes using plastic molding molds. Injection is to heat the thermoplastic to melt and then inject it into the mold cavity, and the molten plastic is cooled and formed in the mold cavity to obtain the injection product. The injection molding machine is mainly composed of an injection system, a mold clamping system, a hydraulic system and an electrical control system, wherein the injection system is also called an injection machine or an injection device, which injects molten plastic into the mold cavity through the injection device. In the related art, the injection device drives the screw to rotate in the barrel by the motor to push the molten plastic to be injected forward. This structure has the problem of insufficient injection pressure, which will directly affect the quality of the product, especially for the injection structure with complex structure, the qualified rate of the injection product is low.

[0033] Especially in high-pressure injection molding process, it is required that the injection assembly can provide sufficient injection pressure and injection speed to ensure that the plastic material can fully fill the mold cavity and form a good product. At the same time, the accurate alignment between the injection assembly and the mold is also one of the key factors to ensure product quality. However, the existing injection device often cannot meet these requirements at the same time, resulting in low qualified rate of injection products and increased production cost. In addition, when adjusting the relative position between the injection assembly and the mold, the traditional injection device usually needs to be manually operated or relies on complex mechanical structures, which not only increases the operation difficulty, but also reduces the production efficiency. Therefore, it is particularly important to develop a new type of injection device that can automatically adjust the position of the injection assembly and provide stable high-pressure injection capability.

[0034] The following refers to the accompanying Figure 1 to the accompanying Figure 5 The injection device of the embodiment of the utility model discloses a high-pressure injection, injection pressure is high, injection filling effect is good, and the qualified rate of injection product is high.

[0035] Referring to Figures 1 to 5 The injection device of the embodiment of the utility model discloses a high-pressure injection, injection pressure is high, injection filling effect is good, and the qualified rate of injection product is high.

[0036] The rack 100 is provided with an injection mold base 110 and a slide rail 120, the slide rail 120 is provided with two and parallel to the horizontal plane, and the injection mold base 110 is used for installing the injection mold;

[0037] The injection assembly 200 comprises an injection support 210, a pushing support 220, a heating cylinder 230, an extrusion pipe 240, a screw rod 250, a motor 260 and a first translation driving mechanism 270. The driving direction of the first translation driving mechanism 270 is parallel to the slide rail 120. The injection support 210 and the pushing support 220 are both slidingly connected to the slide rail 120. The pushing support 220 is located on the side of the injection support 210 away from the injection mold base 110. The heating cylinder 230 is fixedly connected to the injection support 210. The extrusion pipe 240 is slidingly connected to the heating cylinder 230. The outer wall of the extrusion pipe 240 is in abutment with the inner wall of the heating cylinder 230. The screw rod 250 is rotatably connected to the extrusion pipe 240. Preferably, the screw rod 250 is connected to the extrusion pipe 240 through a rotating bearing. One end of the heating cylinder 230 is connected with an injection head 280. The end of the screw rod 250 away from the injection head 280 is connected to the motor 260. The motor 260 is used to drive the screw rod 250 to rotate to realize the action of extrusion injection. The motor 260 is connected to the pushing support 220. The pushing support 220 is connected to the first translation driving mechanism 270. The first translation driving mechanism 270 is connected to the injection support 210. The first translation driving mechanism 270 is used to drive the pushing support 220 to move along the slide rail 120 to approach or move away from the injection support 210, so as to drive the screw rod 250 and the extrusion pipe 240 to synchronously translate. Preferably, the motor 260 is a hydraulic motor 260.

[0038] The positioning assembly 300 comprises two second translation driving mechanisms 310 which are centrally symmetric about the central axis of the heating cylinder 230. The driving direction of the second translation driving mechanism 310 is parallel to the slide rail 120. For each second translation driving mechanism 310, the two ends of the second translation driving mechanism 310 are respectively connected to the injection mold base 110 and the injection support 210. The second translation driving mechanism 310 is used to drive the injection support 210 to move along the slide rail 120 to approach or move away from the injection mold base 110, so as to drive the injection assembly 200 to move to approach or move away from the injection mold base 110.

[0039] In operation, the second translation driving mechanism 310 drives the injection support 210 to translate along the guide rail to approach the injection mold base 110 until the injection head 280 is connected to the injection mold base 110. The heating cylinder 230 heats and melts the plastic raw material in the extrusion pipe 240. The motor 260 drives the screw rod 250 to rotate, so as to drive the molten plastic in the extrusion cylinder to advance and fill the end of the heating cylinder 230 close to the injection head 280. The two first translation driving mechanisms 270 drive the pushing support 220 to move to approach the injection support 210. The screw rod 250 and the extrusion pipe 240 synchronously advance in the heating cylinder 230 close to the injection head 280. The extrusion pipe 240 and the screw rod 250 synchronously extrude the molten plastic in the heating cylinder 230 to the injection head 280, which can effectively improve the injection pressure and thus improve the injection effect.

[0040] Wherein, before injection, a temporary storage cavity is formed between the end of the extrusion tube 240 and the end of the heating cylinder 230 close to the injection head 280, and the working state is shown in the figure Figure 4 When injection, the extrusion tube 240 and the screw 250 are synchronously translated to compress the space of the temporary storage cavity, and the molten plastic is pushed out of the injection head 280, and the working state is shown in the figure Figure 5

[0041] The motor 260 drives the screw 250 to rotate, which realizes the stable extrusion injection of the molten plastic material. The direct connection of the motor 260 and the screw 250 reduces the loss in the energy transmission process, improves the injection pressure and injection speed, and at the same time, the screw 250 is connected to the extrusion tube 240 through a rotating bearing, which ensures the stability and accuracy of the injection process. After the screw 250 extrudes the molten plastic in the extrusion tube 240 to the injection head 280, the first translation driving mechanism 270 can drive the extrusion tube 240 and the screw 250 to advance synchronously by the pushing support 220. The molten plastic located at the end of the heating cylinder 230 close to the injection head 280 is extruded by the extrusion tube and the screw 250. The space that can accommodate the molten plastic is obviously compressed during the extrusion process, which can significantly increase the injection pressure, ensure that the molten plastic shot out of the injection head 280 can completely fill each area of the mold cavity, effectively reduce the appearance of filling blind area, and the injection filling effect is complete and uniform, the injection molding effect is good, and the qualified rate of injection products is high. Especially for products with complex structure, the injection effect of the injection device is obviously higher than that of the traditional injection machine with screw 250 close to the screw 250.

[0042] The injection assembly 200 is connected to the slide rail 120 in a sliding connection manner, and the pushing support 220 is driven to move along the slide rail 120 by the first translation driving mechanism 270, so as to drive the screw 250 and the extrusion tube 240 to translate synchronously. This structure not only simplifies the moving mechanism of the injection assembly 200, but also improves the stability and reliability of its movement.

[0043] It can be understood that the positioning assembly 300 also includes two hinges 320, and the driving end of each second translation driving mechanism 310 is hinged to the injection mold base 110 through the corresponding hinge 320. The hinge 320 is used to realize the rotary connection between the driving end of the second translation driving mechanism 310 and the injection mold base 110, which can effectively reduce the adverse effects caused by unavoidable shaking during work.

[0044] ​In the high-pressure injection molding process, due to the melting, injection and closing of the mold of the plastic material, a certain vibration and jitter will be generated. The traditional fixed connection mode may not be able to completely absorb these jitters, resulting in the influence of the alignment accuracy between the injection assembly 200 and the mold. By introducing the hinge 320 connection, the driving end of the second translation driving mechanism 310 and the injection mold base 110 are rotationally connected. This connection mode can better adapt to the slight vibration and jitter in the working process, and can absorb and alleviate these adverse effects through the rotation of the hinge 320. Not only can it reduce the equipment wear and damage caused by vibration and impact, but also can improve the alignment accuracy and stability between the injection assembly 200 and the mold, and has greater flexibility and adaptability when driving the injection assembly 200 to move.

[0045] It can be understood that the two second translation driving mechanisms 310 are located above and below the horizontal plane of the center axis of the heating cylinder 230, i.e. the two second translation driving mechanisms 310 are symmetric about the center of the heating cylinder 230 at an oblique angle, which can effectively improve the fault tolerance rate of the alignment installation action when driving the injection assembly 200 to translate. Even if there is a slight positional deviation or error, the two second translation driving mechanisms 310 can work cooperatively to ensure that the injection head 280 can be accurately aligned and installed on the injection mold base 110 by adjusting their respective motion trajectories and forces. The rotation axis of the hinge 320 is perpendicular to the slide rail 120, i.e. the rotation axis direction of the hinge 320 is perpendicular to the driving direction of the second translation driving mechanism 310, and the rotation axis of the hinge 320 is parallel to the horizontal plane, so that the second translation driving mechanism 310 can only rotate up and down relative to the injection mold base 110 along the rotation axis in a small amplitude. It can effectively release the jitter that the second translation driving mechanism 310 may generate during the injection molding process, can significantly reduce the rigid collision of the injection device, can effectively ensure the reliability of the structure, can effectively ensure the injection molding accuracy, and the slide rail 120 on the rack 100 and the injection assembly 200 are in an up-down positional relationship, which can effectively ensure the longitudinal positional relationship between the injection assembly and the rack 100, and can effectively ensure the accuracy of the injection head 280 aligning with the corresponding position of the injection mold base 110.

[0046] It can be understood that the injection assembly 200 further comprises at least two guide columns 290, one end of each guide column 290 is connected to the push bracket 220, and the injection bracket 210 is provided with a plurality of guide sleeves 211 matched with the guide columns 290. Preferably, the number of guide sleeves 211 is equal to the number of guide columns 290. The guide column 290 is connected to the guide sleeve 211 by penetrating and sliding, which can effectively improve the reliability of the push injection action.

[0047] Specifically, the first translation driving mechanism 270 is provided with two and is located on the opposite sides of the motor 260, which can effectively improve the collimation of the extrusion injection action and can effectively improve the high-pressure injection effect.

[0048] It can be understood that the heating cylinder 230 comprises an injection tube 231 and a heater 232, the heater 232 is connected outside the injection tube 231, one end of the injection tube 231 is connected to the injection head 280, the extrusion tube 240 abuts in the injection tube 231, the plastic raw material in the extrusion tube 240 can be heated and melted by heating the injection tube 231 by the heater 232. The heater 232 can be an electric heater or an oil heater or other heating device, preferably, the outer surface of the heater 232 can be covered with a heat insulation layer.

[0049] It can be understood that the top of the injection tube 231 is connected with a feeding pipe 233, the feeding pipe 233 is used for connecting an external feeding device, the top of the extrusion tube 240 is provided with a feeding port 241 for connecting the feeding pipe 233, when the feeding port 241 is opposite to the feeding pipe 233, the feeding pipe 233 is in communication with the inside of the extrusion tube 240, the plastic raw material enters the inside of the extrusion tube 240 from the feeding pipe 233 through the feeding port 241.

[0050] Specifically, the screw rod 250 is provided with a non-return screw head at the end far away from the motor 260, that is, the screw rod 250 is a non-return screw rod 250, which cooperates with the extrusion tube 240 to effectively improve the effect of push injection and prevent the molten plastic from flowing back to the injection tube 231, which not only improves the effect of push injection, but also significantly reduces the backflow of molten plastic, thereby improving the quality and consistency of the injection molded product.

[0051] It can be understood that the first translation driving mechanism 270 and the second translation driving mechanism 310 are oil cylinders or hydraulic cylinders, and the first translation driving mechanism 270 and the second translation driving mechanism 310 can also be other mechanisms capable of realizing translation driving.

[0052] It can be understood that the injection mold base 110 is provided with a clearance groove 111 on the side close to the injection support 210, the clearance groove 111 is used for realizing the clearance of the heating cylinder 230 during injection molding, which can effectively ensure the contact effect of the injection head 280 with the mold, and can also avoid unnecessary material blocking problems caused by the too large length of the injection head 280.

[0053] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A high pressure injection molding apparatus characterized by comprising: The utility model relates to a kind of injection molding machine, including: Rack (100), which is provided with injection mold seat (110) and slide rail (120) on the rack (100); Injection assembly (200), including injection support (210), push support (220), heating cylinder (230), extrusion pipe (240), screw (250), motor (260) and first translation driving mechanism (270), the injection support (210) and the push support (220) are both slidingly connected on the slide rail (120), the push support (220) is located on the side of the injection support (210) away from the injection mold seat (110), the heating cylinder (230) is connected to the injection support (210), the extrusion pipe (240) is slidingly connected in the heating cylinder (230), the screw (250) is rotatably connected in the extrusion pipe (240), one end of the heating cylinder (230) is connected with injection head (280), the end of the screw (250) away from the injection head (280) is connected to the motor (260), the motor (260) is connected to the push support (220), the push support (220) is connected to the first translation driving mechanism (270), and the first translation driving mechanism (270) is connected to the injection support (210); Positioning assembly (300), including two second translation driving mechanisms (310) that are symmetric about the center of the heating cylinder (230), two ends of the second translation driving mechanism (310) are connected with the injection mold seat (110) and the injection support (210) respectively.

2. The high pressure injection molding apparatus of claim 1, wherein The positioning assembly (300) further includes two hinges (320), and each second translation driving mechanism (310) is hinged to the injection mold seat (110) through a corresponding hinge (320).

3. The high pressure injection apparatus of claim 2, wherein Two second translation driving mechanisms (310) are located above and below the horizontal plane where the heating cylinder (230) is located, the rotation axis of the hinge (320) is perpendicular to the slide rail (120), and the rotation axis of the hinge (320) is parallel to the horizontal plane.

4. The high pressure injection apparatus of claim 3, wherein The injection assembly (200) further includes at least two guide columns (290), one end of each guide column (290) is connected to the push support (220), the injection support (210) is provided with a plurality of guide sleeves (211) matched with the guide columns (290), and the guide columns (290) are slidingly connected in the guide sleeves (211).

5. The high pressure injection apparatus of claim 1, wherein The heating cylinder (230) includes injection tube (231) and heater (232), and the heater (232) is connected outside the injection tube (231).

6. The high pressure injection apparatus of claim 5, wherein The top of the injection tube (231) is connected with a feeding tube (233), and the top of the extrusion pipe (240) is provided with a feeding port (241) for connecting the feeding tube (233).

7. The high pressure injection apparatus of claim 1, wherein The first translation driving mechanism (270) and the second translation driving mechanism (310) are both oil pressure cylinders.

8. The high pressure injection apparatus of claim 1, wherein The side of the injection mold seat (110) close to the injection support (210) is provided with a clearance slot (111).

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