WO2023088048A1 - 一种高、低压分离的复合注射装置及复合注射方法 - Google Patents

一种高、低压分离的复合注射装置及复合注射方法 Download PDF

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WO2023088048A1
WO2023088048A1 PCT/CN2022/127492 CN2022127492W WO2023088048A1 WO 2023088048 A1 WO2023088048 A1 WO 2023088048A1 CN 2022127492 W CN2022127492 W CN 2022127492W WO 2023088048 A1 WO2023088048 A1 WO 2023088048A1
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injection
pressure
low
pressure injection
hole
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PCT/CN2022/127492
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English (en)
French (fr)
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叶如清
林增荣
曹宜荣
成明祥
王海燕
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德清申达机器制造有限公司
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Publication of WO2023088048A1 publication Critical patent/WO2023088048A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details

Definitions

  • the invention relates to a high-pressure and low-pressure separated compound injection device and a compound injection method, which are used in plastic product injection molding machines.
  • the injection mechanism often includes an injection cylinder, an injection seat, an injection screw (or plunger), a storage barrel, a front barrel, a nozzle, etc., as shown in Chinese patent application No. 201420614046.8.
  • Injection and pressure-holding actions are usually completed by the injection cylinder, and injection and pressure-holding are usually completed by the same screw or the same plunger.
  • P (holding pressure) system pressure P (system) ⁇ injection cylinder A (cylinder) / A (screw) , where: P (holding pressure) is the holding pressure, P (system) is the system pressure, A (oil cylinder) is the cross-sectional area of the injection cylinder, and A (screw) is the cross-sectional area of the injection screw (or injection plunger).
  • the screw or plunger is related to the injection volume, and its cross-sectional area A (screw) is usually determined, so P (holding pressure) ⁇ P (system) *A (cylinder) .
  • the oil cylinders for both injection and pressure holding actions are injection oil cylinders.
  • P pressure holding
  • the overall reconstruction project requires a large amount of work and a long cycle. At the same time, the overall size is increased, and the cost of modification is extremely high.
  • the object of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a compound injection device and compound injection method with reasonable structural design of high-pressure and low-pressure separation, so that the injection molding equipment can meet the high-pressure maintaining pressure, realize rapid injection, and the size Small and low cost.
  • a high-pressure and low-pressure separated compound injection device including a nozzle, a front barrel, a storage barrel, an injection plunger, an injection cylinder, an injection seat and an injection push plate; the nozzle and The front barrel is fixed, the front barrel and the storage barrel are fixed, and the storage barrel is fixed on the injection seat; there is a storage hole inside the storage barrel; there is a flow hole inside the front barrel, and one end of the flow hole is connected to the nozzle.
  • the injection plunger includes a low-pressure injection plunger and a high-pressure injection plunger.
  • the plunger, the injection cylinder includes a high-pressure injection cylinder and a low-pressure injection cylinder;
  • the storage hole is a stepped hole shape, divided into two sections, the front section has a smaller aperture than the rear section;
  • the low-pressure injection plunger Slidingly installed in the rear section of the material storage hole, and its tail end is installed on the injection push plate;
  • the aperture of the front section of the sealing hole is larger than the aperture of the rear section;
  • the front section of the high-pressure injection plunger is a piston body, and the rear section is a plunger rod body.
  • the shaft diameter of the piston body is larger than the shaft diameter of the plunger rod body.
  • the plunger rod body is slidably installed in the rear section of the guide sealing hole, and the tail end of the plunger rod body is connected with the piston rod of the high-pressure injection cylinder;
  • the low-pressure injection cylinder is fixedly installed on the injection seat , the piston rod of the low-pressure injection cylinder is connected to the injection push plate;
  • the high-pressure injection cylinder is fixed on the injection push plate.
  • the present invention also includes a tightening nut, and the storage barrel is fixed on the injection seat by the tightening nut.
  • the front section of the low-pressure injection plunger of the present invention is a piston body, and the rear section is a plunger rod body.
  • the piston body is slidably installed in the rear section of the material storage hole, and the tail end of the plunger rod body is installed on the injection push plate.
  • the outer diameter of the front section of the low-pressure injection plunger of the present invention is larger than that of the rear section.
  • the flow channel hole of the present invention is tapered.
  • the head of the piston body of the present invention is tapered, and the taper is consistent with the taper of the flow channel hole.
  • a compound injection method for high and low pressure separation characterized in that: using the above-mentioned compound injection device to carry out, comprising the following steps:
  • the nozzle is closed, the feeding hole of the front barrel is opened, and the molten plastic is injected from the feeding hole, and then flows into the front section of the storage hole through the flow channel hole, pushing the high-pressure injection plunger and the internal piston and piston rod of the high-pressure injection cylinder to retreat,
  • the molten plastic will simultaneously push the high-pressure injection plunger, low-pressure injection plunger, injection push plate, high-pressure injection cylinder and low-pressure injection cylinder.
  • the rod moves backward until the molten plastic enters the storage hole as required to complete the plasticization;
  • the nozzle is opened, the feeding hole of the front barrel is closed, the low-pressure injection cylinder works, and the injection push plate is pulled, and the low-pressure injection plunger, high-pressure injection cylinder and high-pressure injection plunger are pulled forward by the injection push plate, thereby pushing the injection cylinder inside the storage hole.
  • Molten plastic is ejected from the nozzle to achieve low-pressure injection until the low-pressure injection plunger contacts the step of the storage hole, and the low-pressure injection stops;
  • the low-pressure injection action stops and switches to the high-pressure injection cylinder.
  • the piston rod of the high-pressure injection cylinder pushes the high-pressure injection plunger to move forward. High-pressure injection, when the head of the high-pressure injection plunger contacts the flow channel hole of the front barrel, the high-pressure injection is completed.
  • the present invention Compared with the prior art, the present invention has the following advantages and effects: the present invention enables the injection molding machine to quickly realize injection, and at the same time meets the requirements of high-pressure holding and low-flow requirements for product injection molding, while reducing manufacturing costs and improving The holding pressure improves the injection accuracy, reduces energy consumption, and has the advantages of small size and low cost.
  • Fig. 1 is a three-dimensional structure diagram of an embodiment of the present invention.
  • Fig. 2 is a side view schematic diagram of the embodiment of the present invention.
  • Fig. 3 is a front view structural diagram of an embodiment of the present invention.
  • Fig. 4 is a schematic cross-sectional structural diagram of A-A in Fig. 3 .
  • the embodiment of the present invention includes a nozzle 1, a front barrel 2, a storage barrel 4, a nut 3, a low-pressure injection plunger 5, a high-pressure injection plunger 6, a tightening nut 7, an injection seat 8, an injection push plate 9, and a high-pressure injection cylinder 10 and low pressure injection cylinder 11.
  • the nozzle 1 and the front barrel 2 are fixed with screws, the front barrel 2 and the storage barrel 4 are fixed with screws, and the storage barrel 4 is fixed on the injection seat 8 with a tightening nut 7 .
  • the inside of the material storage barrel 4 is provided with a material storage hole, which is a stepped hole shape and is divided into two sections, the front section 41 and the aperture of the front section 41 are smaller than the aperture of the rear section 42 .
  • the outside of the low-pressure injection plunger 5 is stepped, and the outer diameter of the front section is greater than the outer diameter of the rear section.
  • the front section of the low-pressure injection plunger 5 is a piston body 53, and the rear section is a plunger rod body 54; the piston body 53 of the low-pressure injection plunger 5 Slidingly installed in the rear section 42 of the material storage hole, and can slide linearly flexibly;
  • the low-pressure injection plunger 5 is provided with a guide sealing hole inside.
  • the guide sealing hole is a stepped hole shape and is divided into two sections, front and rear.
  • the aperture of the front section 51 of the guide sealing hole is greater than the aperture of the rear section 52 .
  • the outside of the high-pressure injection plunger 6 is stepped, and the outer diameter of the front section is larger than that of the rear section.
  • the front section of the high-pressure injection plunger 6 is a piston body 62
  • the rear section is a plunger rod body 63 .
  • the head 61 of the piston body 62 is tapered, and the taper is consistent with the taper of the flow channel hole 22 of the front barrel 2 .
  • the shaft diameter of the piston body 62 is larger than the shaft diameter of the plunger rod body 63, and the piston body 62 is slidably installed in the front section 51 of the guide sealing hole and the front section 41 of the storage hole, and can flexibly and linearly slide; the plunger rod body 63 is slidably installed in the In the rear section 52 of the guide sealing hole, and the tail end of the plunger rod body 63 passes through the central hole of the injection push plate 9 and is connected with the piston rod of the high-pressure injection cylinder 10 .
  • Two low-pressure injection cylinders 11 are provided, and are symmetrically fixed on both sides of the injection seat 8 with screws, and the piston rod of the low-pressure injection cylinder 11 is connected with the injection push plate 9 with a nut 3 .
  • the high-pressure injection cylinder 10 is fixed on the center of the injection push plate 9 with screws.
  • the inside of the front barrel 2 is provided with a flow channel hole 22, the flow channel hole 22 is tapered, and one end is connected with the nozzle 1, and the other end is connected with the front section 41 of the material storage hole 4 of the storage barrel.
  • a feeding hole 21 is arranged on the front barrel 2, and the feeding hole 21 is connected with a runner hole 22.
  • a compound injection method for high and low pressure separation which is carried out by using the above high and low pressure separation compound injection device, comprising the following steps:
  • the nozzle 1 is closed, the feeding hole of the front barrel 2 is opened, and the molten plastic is injected from the feeding hole 21, and then flows into the front section 41 of the storage hole through the runner hole 22,
  • the nozzle 1 is opened, the feeding hole 21 of the front barrel 2 is closed, the low-pressure injection cylinder 11 works, the injection push plate 9 is pulled, and the low-pressure injection plunger 5, high-pressure injection cylinder 10 and high-pressure injection plunger are pulled forward by the injection push plate 9 6. Push the molten plastic inside the storage hole to be ejected from the nozzle 1 to realize low-pressure injection until the low-pressure injection plunger 5 contacts the step of the storage hole, and the low-pressure injection stops.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

本发明提供一种高、低压分离的复合注射装置及复合注射方法，使注塑装备满足高压保压，实现快速注射，且尺寸小、成本低。进料孔与流道孔接通；贮料孔为台阶孔形，前段孔径小于后段孔径；低压注射柱塞滑动安装于贮料孔后段内，其尾端安装在注射推板上；低压注射柱塞内部开设有导向密封孔，导向密封孔为台阶孔形，前段孔径大于后段孔径；高压注射柱塞前段为活塞体，后段为柱塞杆体，活塞体轴径比柱塞杆体轴径大，活塞体滑动安装在导向密封孔前段和贮料孔前段中，柱塞杆体滑动安装在导向密封孔后段中，柱塞杆体尾端与高压注射油缸活塞杆连接；低压注射油缸固定安装在注射座上，低压注射油缸活塞杆与注射推板连接；高压注射油缸固定在注射推板上。

Description

一种高、低压分离的复合注射装置及复合注射方法 技术领域
本发明涉及一种高、低压分离的复合注射装置及复合注射方法，用于塑料制品注射成型机中。
背景技术
在注塑生产中，由于塑料制品注射成型后，在冷却过程中由于收缩产生缺陷。为保证质量，对于一些制品需要在冷却过程中进行保压补缩。但制品冷却时，塑料将逐渐凝固，使得流动性急剧变差，因此补缩需要更大的保压压力。
常规的注塑装备，注射机构常常包含注射油缸、注射座、注射螺杆(或柱塞)、贮料筒、前料筒、喷嘴等，如申请号为201420614046.8的中国专利所示。注射与保压动作通常都是由注射油缸完成的，且注射与保压通常用同一螺杆或同一柱塞完成。根据帕斯卡定律：P (保 压)＝系统压力P (系统)×注射油缸A (油缸)/A (螺杆)，式中：P (保压)为保压压力、P (系统)为系统压力、A (油缸)为注射油缸截面积、A (螺杆)为注射螺杆(或注射柱塞)截面积。螺杆或柱塞与注射容积相关，其截面积A (螺杆)通常是确定的，因此P (保压)∝P (系统)*A (油缸)。
注射与保压动作的油缸都为注射油缸，从改动油缸截面积而获得更高的P (保压)，则需要对注射座、液压系统等进行全面改动，整体改造工程量大，周期长，同时增加了整体外形尺寸，改动成本极大。
而提升P (系统)以获得更高的P (保压)，这需要受到电机、油泵等配套元器件的限制，同时将大幅提升采购成本。
综上所述，目前注塑装备中，增加保压压力常常是增大注射油缸或增大系统等方法，这将会大大增加整机外形尺寸，并受到元器件限制，同时大幅提高制造成本。
发明内容
本发明的目的在于克服现有技术中存在的上述不足，而提供一种结构设计合理的高、低压分离的复合注射装置及复合注射方法，使注塑装备满足高压保压，实现快速注射，且尺寸小、成本低。
本发明解决上述问题所采用的技术方案是：一种高、低压分离的复合注射装置，包括喷嘴、前料筒、贮料筒、注射柱塞、注射油缸、注射座和注射推板；喷嘴与前料筒固定，前料筒与贮料筒固定，贮料筒固定在注射座上；贮料筒内部开设有贮料孔；前料筒内部设置有流道孔，流道孔一端与喷嘴接通，另一端与贮料孔接通；前料筒上还设置有进料孔， 进料孔与流道孔接通；其特征在于：所述的注射柱塞包括低压注射柱塞和高压注射柱塞，所述的注射油缸包括高压注射油缸和低压注射油缸；所述的贮料孔为台阶孔形，分为前后两段，前段的孔径小于后段的孔径；所述的低压注射柱塞滑动安装于贮料孔的后段内，其尾端安装在注射推板上；所述的低压注射柱塞内部开设有导向密封孔，导向密封孔为台阶孔形，分为前后两段，导向密封孔前段的孔径大于后段的孔径；所述的高压注射柱塞的前段为活塞体，后段为柱塞杆体，活塞体的轴径比柱塞杆体的轴径大，活塞体滑动安装在导向密封孔前段和贮料孔前段中，柱塞杆体滑动安装在导向密封孔后段中，且柱塞杆体的尾端与高压注射油缸的活塞杆连接；所述的低压注射油缸固定安装在注射座上，低压注射油缸的活塞杆与注射推板连接；所述的高压注射油缸固定在注射推板上。
本发明还包括摒紧螺母，贮料筒用摒紧螺母固定在注射座上。
本发明所述的低压注射柱塞的前段为活塞体，后段为柱塞杆体，活塞体滑动安装于贮料孔的后段内，柱塞杆体尾端安装在注射推板上。
本发明所述的低压注射柱塞前段的外径大于后段的外径。
本发明所述的流道孔为锥形。
本发明所述的活塞体的头部为锥形，锥度与流道孔的锥度一致。
本发明所述的低压注射油缸设置两个，对称固定安装在注射座两侧。
一种高、低压分离的复合注射方法，其特征在于：采用上述的复合注射装置进行，包括如下步骤：
(1)、进料阶段：
喷嘴关闭，前料筒的进料孔打开，熔融塑料从进料孔注入，然后通过流道孔流入贮料孔的前段中，推动高压注射柱塞和高压注射油缸内部活塞和活塞杆往后退，当高压注射柱塞的活塞体尾端与导向密封孔台阶处接触后，熔融塑料将同时推动高压注射柱塞、低压注射柱塞、注射推板、高压注射油缸及低压注射油缸中的活塞和活塞杆向后运动，直至熔融塑料按要求进入贮料孔，完成塑化；
(2)、低压注射阶段：
喷嘴打开，前料筒的进料孔关闭，低压注射油缸工作，拉动注射推板，通过注射推板向前拉动低压注射柱塞、高压注射油缸和高压注射柱塞，从而推动贮料孔内部的熔融塑料从喷嘴中喷出，实现低压注射，直至低压注射柱塞与贮料孔的台阶处接触后，低压注射停止；
(3)、高压注射阶段：
低压注射动作停止，切换为高压注射油缸工作，高压注射油缸活塞杆推动高压注射柱 塞向前移动，高压注射柱塞推动流道孔和贮料筒前段中的熔融塑料从喷嘴中喷出，实现高压注射，当高压注射柱塞的头部与前料筒的流道孔接触后，高压注射完成。
本发明与现有技术相比，具有以下优点和效果：本发明使注塑机快速实现注射，同时满足高压保压的要求，满足了低流动需求的制品注射成型要求，同时降低了制造成本，提升保压压力，提升了注射精度，降低工作能耗，并具有尺寸小、成本低的优点。
附图说明
图1是本发明实施例的立体结构示意图。
图2是本发明实施例的侧视结构示意图。
图3是本发明实施例的前视结构示意图。
图4是图3中A-A向的剖视结构示意图。
具体实施方式
下面结合附图并通过实施例对本发明作进一步的详细说明，以下实施例是对本发明的解释而本发明并不局限于以下实施例。
本发明实施例包括喷嘴1、前料筒2、贮料筒4、螺母3、低压注射柱塞5、高压注射柱塞6、摒紧螺母7、注射座8、注射推板9、高压注射油缸10和低压注射油缸11。
喷嘴1与前料筒2用螺钉固定，前料筒2与贮料筒4用螺钉固定，贮料筒4用摒紧螺母7固定在注射座8上。
贮料筒4内部开设有贮料孔，贮料孔为台阶孔形，分为前后两段，前段41的孔径小于后段42的孔径。
低压注射柱塞5的外部为台阶状，其前段的外径大于后段的外径，低压注射柱塞5的前段为活塞体53，后段为柱塞杆体54；低压注射柱塞5的活塞体53滑动安装于贮料孔的后段42内，并能灵活直线滑动；低压注射柱塞5的柱塞杆体54尾端与注射推板9配合，同时用螺钉安装在注射推板9上。
低压注射柱塞5内部开设有导向密封孔。导向密封孔为台阶孔形，分为前后两段，导向密封孔的前段51的孔径大于后段52的孔径。
高压注射柱塞6的外部为台阶状，其前段的外径大于后段的外径，高压注射柱塞6的前段为活塞体62，后段为柱塞杆体63。活塞体62的头部61为锥形，锥度与前料筒2的流道孔22的锥度保持一致。活塞体62的轴径比柱塞杆体63的轴径大，活塞体62滑动安装在导向密封孔的前段51和贮料孔的前段41中，并能灵活直线滑动；柱塞杆体63滑动安装在导向密封孔的后段52中，且柱塞杆体63的尾端穿过注射推板9的中心孔后与高压注射油缸10的活塞杆连接。
低压注射油缸11设置两个，用螺钉中心对称固定安装在注射座8两侧，低压注射油缸11的活塞杆用螺母3与注射推板9连接。
高压注射油缸10用螺钉固定在注射推板9的中心。
前料筒2内部设置有流道孔22,流道孔22为锥形，且一端与喷嘴1接通，另一端与贮料筒4贮料孔的前段41接通。
前料筒2上设置有进料孔21，进料孔21与流道孔22接通。
一种高、低压分离的复合注射方法，采用上述高、低压分离的复合注射装置进行，包括如下步骤：
(1)、进料阶段：
喷嘴1关闭，前料筒2的进料孔打开，熔融塑料从进料孔21注入，然后通过流道孔22流入贮料孔的前段41中，
推动高压注射柱塞6和高压注射油缸10内部活塞和活塞杆往后退，当高压注射柱塞6的活塞体62尾端与导向密封孔台阶处接触后，熔融塑料将同时推动高压注射柱塞6、低压注射柱塞5、注射推板9、高压注射油缸10及低压注射油缸11中的活塞和活塞杆向后运动，直至熔融塑料按要求进入贮料孔，完成塑化。
(2)、低压注射阶段：
喷嘴1打开，前料筒2的进料孔21关闭，低压注射油缸11工作，拉动注射推板9，通过注射推板9向前拉动低压注射柱塞5、高压注射油缸10和高压注射柱塞6，从而推动贮料孔内部的熔融塑料从喷嘴1中喷出，实现低压注射，直至低压注射柱塞5与贮料孔的台阶处接触后，低压注射停止。
(3)、高压注射阶段：
低压注射动作停止，切换为高压注射油缸10工作，进入高压状态，高压注射油缸10活塞杆推动高压注射柱塞6工作，高压注射柱塞6推动流道孔22和贮料筒4的前段41中的熔融塑料从喷嘴1中喷出，实现高压注射，当高压注射柱塞6的头部61与前料筒2的流道孔22接触后，高压注射完成。
此外，需要说明的是，本说明书中所描述的具体实施例，其零、部件的形状、所取名称等可以不同，本说明书中所描述的以上内容仅仅是对本发明结构所作的举例说明。凡依据本发明专利构思所述的构造、特征及原理所做的等效变化或者简单变化，如动力机构由油缸变为电机驱动，均包括于本发明专利的保护范围内。

Claims (8)

  1. 一种高、低压分离的复合注射装置，包括喷嘴、前料筒、贮料筒、注射柱塞、注射油缸、注射座和注射推板；喷嘴与前料筒固定，前料筒与贮料筒固定，贮料筒固定在注射座上；贮料筒内部开设有贮料孔；前料筒内部设置有流道孔，流道孔一端与喷嘴接通，另一端与贮料孔接通；前料筒上还设置有进料孔，进料孔与流道孔接通；其特征在于：所述的注射柱塞包括低压注射柱塞和高压注射柱塞，所述的注射油缸包括高压注射油缸和低压注射油缸；所述的贮料孔为台阶孔形，分为前后两段，前段的孔径小于后段的孔径；所述的低压注射柱塞滑动安装于贮料孔的后段内，其尾端安装在注射推板上；所述的低压注射柱塞内部开设有导向密封孔，导向密封孔为台阶孔形，分为前后两段，导向密封孔前段的孔径大于后段的孔径；所述的高压注射柱塞的前段为活塞体，后段为柱塞杆体，活塞体的轴径比柱塞杆体的轴径大，活塞体滑动安装在导向密封孔前段和贮料孔前段中，柱塞杆体滑动安装在导向密封孔后段中，且柱塞杆体的尾端与高压注射油缸的活塞杆连接；所述的低压注射油缸固定安装在注射座上，低压注射油缸的活塞杆与注射推板连接；所述的高压注射油缸固定在注射推板上。
  2. 根据权利要求1所述的高、低压分离的复合注射装置，其特征在于：还包括摒紧螺母，贮料筒用摒紧螺母固定在注射座上。
  3. 根据权利要求1所述的高、低压分离的复合注射装置，其特征在于：所述的低压注射柱塞的前段为活塞体，后段为柱塞杆体，活塞体滑动安装于贮料孔的后段内，柱塞杆体尾端安装在注射推板上。
  4. 根据权利要求1所述的高、低压分离的复合注射装置，其特征在于：所述的低压注射柱塞前段的外径大于后段的外径。
  5. 根据权利要求1所述的高、低压分离的复合注射装置，其特征在于：所述的流道孔为锥形。
  6. 根据权利要求5所述的高、低压分离的复合注射装置，其特征在于：所述的活塞体的头部为锥形，锥度与流道孔的锥度一致。
  7. 根据权利要求1所述的高、低压分离的复合注射装置，其特征在于：所述的低压注射油缸设置两个，对称固定安装在注射座两侧。
  8. 一种高、低压分离的复合注射方法，其特征在于：采用权利要求1-7任一权利要求所述的复合注射装置进行，包括如下步骤：
    (1)、进料阶段：
    喷嘴关闭，前料筒的进料孔打开，熔融塑料从进料孔注入，然后通过流道孔流入贮料孔的前段中，推动高压注射柱塞和高压注射油缸内部活塞和活塞杆往后退，当高压注射柱 塞的活塞体尾端与导向密封孔台阶处接触后，熔融塑料将同时推动高压注射柱塞、低压注射柱塞、注射推板、高压注射油缸及低压注射油缸中的活塞和活塞杆向后运动，直至熔融塑料按要求进入贮料孔，完成塑化；
    (2)、低压注射阶段：
    喷嘴打开，前料筒的进料孔关闭，低压注射油缸工作，拉动注射推板，通过注射推板向前拉动低压注射柱塞、高压注射油缸和高压注射柱塞，从而推动贮料孔内部的熔融塑料从喷嘴中喷出，实现低压注射，直至低压注射柱塞与贮料孔的台阶处接触后，低压注射停止；
    (3)、高压注射阶段：
    低压注射动作停止，切换为高压注射油缸工作，高压注射油缸活塞杆推动高压注射柱塞向前移动，高压注射柱塞推动流道孔和贮料筒前段中的熔融塑料从喷嘴中喷出，实现高压注射，当高压注射柱塞的头部与前料筒的流道孔接触后，高压注射完成。
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GB501277A (en) * 1937-08-21 1939-02-21 Henry Grafton Improvements in and relating to the moulding of thermoplastic materials by injection
CN106827427A (zh) * 2016-12-02 2017-06-13 湖北工业大学 一种高分子材料的高压塑化及注射方法和装置
CN114228072A (zh) * 2021-11-19 2022-03-25 德清申达机器制造有限公司 一种高、低压分离的复合注射装置及复合注射方法

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GB501277A (en) * 1937-08-21 1939-02-21 Henry Grafton Improvements in and relating to the moulding of thermoplastic materials by injection
CN106827427A (zh) * 2016-12-02 2017-06-13 湖北工业大学 一种高分子材料的高压塑化及注射方法和装置
CN114228072A (zh) * 2021-11-19 2022-03-25 德清申达机器制造有限公司 一种高、低压分离的复合注射装置及复合注射方法

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