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WO2016050002A1 - 电动液压混合式射出机构 - Google Patents

电动液压混合式射出机构 Download PDF

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Publication number
WO2016050002A1
WO2016050002A1 PCT/CN2015/000629 CN2015000629W WO2016050002A1 WO 2016050002 A1 WO2016050002 A1 WO 2016050002A1 CN 2015000629 W CN2015000629 W CN 2015000629W WO 2016050002 A1 WO2016050002 A1 WO 2016050002A1
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Prior art keywords
hydraulic
electric drive
injection
push plate
hydraulic cylinder
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PCT/CN2015/000629
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English (en)
French (fr)
Inventor
陈国永
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陈国永
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Publication of WO2016050002A1 publication Critical patent/WO2016050002A1/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
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76545—Flow rate
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76595—Velocity

Definitions

  • the invention relates to the technical field of injection molding machines, in particular to an electro-hydraulic hybrid injection mechanism for injection of molten materials in an injection molding machine.
  • Injection molding machines are commonly used plastic molding machines.
  • the components on the injection molding machine are generally divided into a metering unit, a heating and plasticizing unit, an injection filling unit, a mold clamping unit, a cooling unit and a discharging unit. These functional units work together to complete the molding of the plastic part.
  • the injection molding unit is completed by an injection mechanism.
  • the injection mechanism usually includes a push plate for pushing the screw and the screw connector to move at a certain speed, and the screw movement requires the melt to be injected into the mold cavity at a sufficiently large injection speed in a short time while ensuring accurate injection. the amount.
  • high injection speeds and precise injection volumes are required to achieve high quality products.
  • the existing injection mechanism has two structures of hydraulic drive and electric drive.
  • the hydraulic drive drives the push plate through the oil cylinder, and the oil cylinder is controlled by a hydraulic valve, which is controlled by the central control module.
  • the speed and displacement of the push plate during the injection process are controlled by the cylinder drive.
  • the advantage is that the power is sufficient to meet the injection speed requirement; the disadvantage is that the speed and displacement of the push plate cannot be accurately controlled, resulting in an error in the injection amount; if a servo valve is used, the servo valve is expensive and requires high hydraulic system and is expensive. In addition, the high energy consumption of the hydraulic system is unavoidable.
  • the electric drive is the motor that drives the ball screw pair through the gear set (or timing pulley).
  • the motor is powered to the gear, and the gear drives the ball screw pair to drive the push plate to complete the injection action.
  • the electric drive can achieve precise control of the injection volume through the encoder; since the motor needs to overcome the strong injection resistance from the start to the maximum speed, the servo motor is difficult to provide sufficient power in a short time, resulting in slow injection response and insufficient injection speed. This has led to limited application of injection molding machines.
  • the powerful driving force required for injection is obtained by the motor by driving the ball screw pair.
  • the ball screw pair must be able to withstand the heavy load during the driving process.
  • the general ball screw pair is not competent and can withstand heavy-duty ball screws. The general price is very expensive and the life is short, which affects the use of electric injection molding machines.
  • the technical problem to be solved by the present invention is to provide an electro-hydraulic hybrid injection mechanism capable of providing sufficient ejection driving force in a short time to ensure an injection speed and accurately controlling an injection amount, in view of the state of the art.
  • the injection mechanism also has the advantages of low energy consumption and low investment.
  • the electro-hydraulic hybrid injection mechanism includes a push plate connected to the screw connector and an electric drive assembly connected to the push plate, wherein the push plate is further A piston or cylinder connected to the hydraulic cylinder is connected to the hydraulic valve, which is connected to the central control system of the injection molding machine.
  • the electric drive assembly includes a ball screw pair that is drivingly coupled to the push plate, the ball screw pair being coupled to the drive motor via a transmission assembly.
  • the present invention will innovate by controlling the driving force of the driving force and the driving force curve of the driving force with respect to the driving force of the driven object, and the moving speed of the driven object.
  • the control of the positional parameter is separated from the control of the driving force.
  • the hydraulic system only provides a strong driving force and is independent of the motion parameters such as the moving speed and positional parameters of the driven object and the hydraulic driving force, and the moving speed of the driven object and
  • the positional parameters are independently performed by the electric drive mechanism.
  • the encoder on the servo motor can be used. (Without the use of the pressure sensor), the precise injection molding of the injection molding machine can be controlled by controlling the motion curve of the push plate, or two types of control can be controlled. The way to use together.
  • the electric drive assembly and the hydraulic cylinder of the invention can be used together to provide powerful injection power at the moment of injection of the melt, and the precise control of the melt injection amount can be easily realized by the electric drive mechanism, thereby ensuring product quality.
  • the configuration requirements and operating environment requirements of the two are reduced; and the energy consumption is also greatly reduced compared to the hydraulic drive; the electric drive is greatly reduced compared to the use of the electric drive alone.
  • the force that is, the motor power
  • the electro-hydraulic hybrid injection mechanism provided by the invention can be used in other occasions in addition to the injection molding machine, for example, it is suitable for supporting the die casting machine and the like, and the molten material is filled at a certain speed and pressure in a short time.
  • the mold cavity, and the driven object are required to be driven and accurately positioned by a powerful driving force in a short time.
  • Figure 1 is a schematic view of an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an embodiment of the present invention.
  • the electro-hydraulic hybrid injection mechanism comprises:
  • Pushing plate 1 the first end face of the push plate 1 is connected to the screw connector 4 of the injection molding machine, and a pressure sensor 5 for detecting the pressure in the barrel of the injection molding machine is further disposed between the screw connector and the push plate, and the pressure sensor 5 will be The detected pressure is transmitted to the central control system 6, and the central control system makes a judgment based on the received data to control the relevant functional unit. Actions;
  • the hydraulic cylinder 3 is provided in two parts.
  • the piston rod of the hydraulic cylinder is drivingly connected to the first end surface of the push plate, and the piston rod of the hydraulic cylinder 3 can also be connected to the second end surface of the push plate as needed; or It may also be a cylinder connection push plate of the hydraulic cylinder;
  • the hydraulic cylinder 3 is connected with a hydraulic power source through a hydraulic pipe (not shown) and a hydraulic valve 8, the hydraulic valve is also connected to the control system, and the control system issues a command to control the hydraulic valve. Opening and closing, thereby operating the hydraulic cylinder, the hydraulic valve in this embodiment is a solenoid valve;
  • the electric drive assembly 2 converts the rotational motion of the motor into a linear motion to control the movement of the push plate.
  • the electric drive component 2 in this embodiment includes:
  • the lead screw 211 is connected to the transmission assembly 22, and is driven to rotate by the transmission assembly;
  • the wire nut 212 is fixedly connected in the push plate 1;
  • Encoder 7 can be connected to the motor 23, can also be connected to the ball screw pair, this embodiment is connected to the ball screw pair, the output of the encoder 7 is connected to the central control system 6;
  • the transmission assembly 22 is configured to transmit the power of the motor 23 to the lead screw, which may be a gear transmission group, a pulley transmission group, or other transmission components, which may be selected and assembled according to requirements.
  • the motor 23 has a control end connected to the central control system of the injection molding machine, and a central control system controls the operation of the motor.
  • the central control system simultaneously controls the hydraulic valve and the motor to start. Since the hydraulic system is supplied with pressure and the power is large, the hydraulic cylinder pulls the push plate with sufficient power and extremely fast speed at the moment of melt injection. At the same time, the motor transmits power to the lead screw through the transmission component, the screw rotates to drive the nut to drive the push plate forward, and the auxiliary hydraulic system injects the melt, thereby driving the screw 6 to move quickly, and feeding the material with sufficient pressure and speed.
  • the melt in the cylinder is injected to ensure the speed and pressure of the melt into the mold cavity, thus ensuring the quality of the injection molded product; at the same time, the electric drive mechanism precisely controls the displacement of the push plate, thereby precisely controlling the injection amount of the melt.
  • the movement of the push plate in the electro-hydraulic hybrid injection mechanism is jointly driven by the hydraulic cylinder and the electric drive mechanism, and the movement speed and displacement of the push plate are completely controlled by the electric drive mechanism, which can fully ensure the pressure required by the injection molding machine and the pressure required by the injection molding machine.
  • Speed, and precise control of injection volume to ensure the quality of the product; at the same time, due to the use of electric drive components and hydraulic cylinders, the configuration requirements and operating environment requirements of the two are reduced; and the energy consumption is also large compared to the hydraulic drive.
  • the amplitude is reduced; the electric driving force (ie, the motor power) is greatly reduced compared to the use of the electric drive alone, and the working condition of the ball screw pair is greatly improved, and the cost of the electric drive mechanism is greatly reduced.

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

Abstract

一种电动液压混合式射出机构，包括与螺杆连接器相连接的推板（1），推板（1）连接电动驱动组件（2）和液压缸（3）的活塞或缸筒，液压缸（3）连接液压阀，液压阀连接注塑机的中央控制系统。电动驱动组件（2）包括与滚珠丝杠副（21），滚珠丝杠副（21）通过传动组件（22）连接驱动电机（23）。与现有技术相比，本发明中的电动驱动组件和液压缸配合使用，能够在注射熔料的瞬间提供强大的注射动力，并且通过电动驱动机构能够很容易的实现熔料注射量的精确控制，保证了产品质量。同时，由于电动驱动组件和液压缸配合使用，降低了两者的配置要求和运行环境的要求；且相对于单独使用电动驱动或液压驱动，能耗也大幅度降低。

Description

电动液压混合式射出机构 技术领域
本发明涉及注塑机的技术领域，尤其指注塑机中用于熔料射出的电动液压混合式射出机构。
背景技术
注塑机是常用的塑料成型机械。注塑机上各部件按功能区分通常包括计量加料单元、加热塑化单元、注射充模单元、锁模保压单元、冷却单元和出料单元。这些功能单元相互配合，完成塑件成型。
其中注射充模单元是由射出机构来完成的。射出机构通常包括用于推动螺杆和螺杆连接器以一定速度运动的推板，螺杆运动的要求熔料在短时间内以足够大的注射速度射入到模具型腔内，同时要保证精确的注射量。通常高的注射速度和精确的注射量才能满足才能获得高质量的产品。
现有的射出机构有液压驱动和电动驱动两种结构。
其中，液压驱动是通过油缸来驱动推板，而油缸由液压阀来控制，液压阀由中央控制模块控制。射出过程中推板的运动速度以及位移均由油缸驱动控制。其优点是动力足，能够满足注射速度的要求；缺点是无法精确控制推板的速度和位移，导致注射量的误差；如果使用伺服阀，伺服阀价格昂贵且对液压系统的要求高、代价大，另外液压系统的高耗能也是无法避免的。
电动驱动是电机通过齿轮组(或同步带轮)驱动滚珠丝杠副动作。由电机提供动力给齿轮，齿轮带动滚珠丝杠副驱动推板运动，从而完成注射动作。电动驱动可以通过编码器来实现注射量的精确控制；由于电机从启动到达到最大转速需要克服强大的射出阻力，伺服电机很难在短时间内提供足够的动力，导致注射响应慢，射出速度不够，从而导致注塑机的应用受限。另外注射所需的强大驱动力由电机通过驱动滚珠丝杠副来获得，滚珠丝杠副必须能承受驱动过程中的重载，一般的滚珠丝杠副不能胜任，能承受重载的滚珠丝杠副一般价格很昂贵，寿命也短，影响了电动注塑机的使用。
发明内容
本发明所要解决的技术问题是针对现有技术的现状提供一种即能在短时间内提供足够的射出驱动力从而保证注射速度且能精确控制注射量的电动液压混合式射出机构，同时，该射出机构还具有能耗低、投资省的优点。
本发明解决上述技术问题所采用的技术方案为：该电动液压混合式射出机构，包括与螺杆连接器相连接的推板、与推板相连的电动驱动组件，其特征在于：所述推板还连接液压缸的活塞或缸筒，所述液压缸连接液压阀，所述液压阀连接注塑机的中央控制系统。
所述电动驱动组件包括与所述推板驱动连接的滚珠丝杠副，所述滚珠丝杠副通过传动组件连接驱动电机。
与现有技术相比，本发明将通过控制驱动力的大小和驱动力相对时间的驱动力曲线来控制被驱动物的运动速度和位置参数的传统做法进行创新，将对被驱动物体的运动速度和位置参数的控制从对驱动力的控制从中分离出来，液压系统只提供强大的驱动力而与被驱动物的运动速度和位置参数等运动参数与液压驱动力无关，被驱动物的运动速度和位置参数单独由电动的驱动机构独立完成；另外也可以利用伺服电机上的编码器，(不使用压力传感器的情况)通过控制推板的运动曲线来控制注塑机的精确注塑，也可以二种控制方式结合一起使用。
本发明中的电动驱动组件和液压缸配合使用，能够在注射熔料的瞬间提供强大的注射动力，并且通过电动驱动机构能够很容易的实现熔料注射量的精确控制，保证了产品质量。同时，由于电动驱动组件和液压缸配合使用，降低了两者的配置要求和运行环境的要求；且相对于液压驱动，能耗也大幅度降低；相对于单独使用电动驱动大幅度降低了电动驱动力(也即电机功率)，改善了滚珠丝杠副的工作工况，同时降低了对驱动电机、传动机构和滚珠丝杠副的性能要求，从而大幅度降低了电动驱动机构的成本。
本发明所提供的电动液压混合式射出机构除了可以配套注塑机使用外，也可以用在其他场合，比如，适用于配套的压铸机等要求熔料等在短暂的时间内以一定速度和压力填充模具型腔，和被驱动物体要求在短时间内被强大的驱动力驱动和精确定位的设备。
附图说明
图1为本发明实施例的示意图；
图2为本发明实施例原理图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
如图1和图2所示，该电动液压混合式射出机构包括：
推板1，推板1的第一端面上连接注塑机的螺杆连接器4，并且螺杆连接器和推板之间还设有用于检测注塑机料筒内压力的压力传感器5，压力传感器5将检测到的压力传递到中央控制系统6，中央控制系统根据接收到的数据做出判断，控制相关功能单元 的动作；
液压缸3，本实施例设置了两个，液压缸的活塞杆驱动连接在推板的第一端面上，液压缸3的活塞杆也可以根据需要连接在推板的第二端面上；或者，也可以是液压缸的缸筒连接推板；液压缸3通过液压管路(图中未示出)和液压阀8连接液压动力源，液压阀还连接控制系统，由控制系统发出指令控制液压阀的开闭，从而使液压缸工作，本实施例中的液压阀为电磁阀；
电动驱动组件2，将电机的旋转运动转换为直线运动，从而控制推板移动。能够实现该功能的电动驱动组件有多种，本实施例中的电动驱动组件2包括：
滚珠丝杠副21，其丝杠211连接传动组件22，由传动组件驱动转动；其丝母212固定连接在推板1内；
编码器7，可以连接在电机23上，也可以连接滚珠丝杠副，本实施例连接在滚珠丝杠副上，编码器7的输出端连接中央控制系统6；
传动组件22，用于将电机23的动力传递到丝杠上，其可以是齿轮传动组，也可以是皮带轮传动组，或其它传动组件，可根据需要选择、组配。
电机23，其控制端连接注塑机的中央控制系统，有中央控制系统控制电机的工作与否。
该电动液压混合式射出机构的工作原理描述如下：
在注塑机料筒熔料工序完成后向模具型腔内射料时，中央控制系统同时控制液压阀和电机启动。由于液压系统供压力，动力大，因此在熔料注射的瞬间，液压缸以足够的动力和极快的速度拉动推板。与此同时，电机通过传动组件将动力传递到丝杠上，丝杠转动驱动丝母带动推板前移，辅助液压系统注射熔料，从而驱动螺杆6快速移动，以足够的压力和速度将料筒内的熔料射出，保证了熔料进入模具型腔内的速度和压力，从而保证了注塑产品的质量；同时，电动驱动机构精确控制推板的位移，从而精确控制熔料的注射量。
该电动液压混合式射出机构中推板的运动由液压缸和电动驱动机构共同驱动，而推板的运动速度和位移则完全由电动驱动机构单独控制，能够充分保证注塑机射料所需压力和速度，并且能精确控制注射量，保证了产品的质量；同时，由于电动驱动组件和液压缸配合使用，降低了两者的配置要求和运行环境的要求；且相对于液压驱动，能耗也大幅度降低；相对于单独使用电动驱动大幅度降低了电动驱动力(也即电机功率)，也大幅度改善了滚珠丝杠副的工作工况，大幅度降低了电动驱动机构的成本。

Claims (2)

  1. 一种电动液压混合式射出机构，包括与螺杆连接器相连接的推板(1)、与推板(1)相连的电动驱动组件(2)，其特征在于：所述推板(1)还连接液压缸(3)的活塞或缸筒，所述液压缸(3)连接液压阀，所述液压阀连接注塑机的中央控制系统。
  2. 根据权利要求1所述的电动液压混合式射出机构，其特征在于：所述电动驱动组件(2)包括与所述推板(1)驱动连接的滚珠丝杠副(21)，所述滚珠丝杠副(21)通过传动组件(22)连接驱动电机(23)。
PCT/CN2015/000629 2014-09-30 2015-09-06 电动液压混合式射出机构 WO2016050002A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410522326.0A CN104260294A (zh) 2014-09-30 2014-09-30 电动液压混合式射出机构
CN201410522326.0 2014-09-30

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