WO2024040943A1 - Injection molding machine structure precisely controlled via digital hydraulic oil cylinder - Google Patents

Injection molding machine structure precisely controlled via digital hydraulic oil cylinder Download PDF

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Publication number
WO2024040943A1
WO2024040943A1 PCT/CN2023/081892 CN2023081892W WO2024040943A1 WO 2024040943 A1 WO2024040943 A1 WO 2024040943A1 CN 2023081892 W CN2023081892 W CN 2023081892W WO 2024040943 A1 WO2024040943 A1 WO 2024040943A1
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WO
WIPO (PCT)
Prior art keywords
injection molding
conveying
molding machine
digital hydraulic
hydraulic cylinder
Prior art date
Application number
PCT/CN2023/081892
Other languages
French (fr)
Chinese (zh)
Inventor
李君�
张贤宝
林娅丹
Original Assignee
西诺控股集团有限公司
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Publication of WO2024040943A1 publication Critical patent/WO2024040943A1/en

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Classifications

    • 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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • B29C45/6778—Stroke adjusting or limiting means
    • 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
    • B29C45/20—Injection nozzles
    • 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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • 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
    • 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
    • B29C45/7613—Measuring, controlling or regulating the termination of flow of material into the mould
    • 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
    • B29C45/762—Measuring, controlling or regulating the sequence of operations of an injection cycle
    • 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
    • B29C2945/76498—Pressure
    • 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
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76665—Injection unit 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
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76688—Injection unit nozzle
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76692—Injection unit drive means
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76702—Closure or clamping device
    • B29C2945/76709—Closure or clamping device clamping or closing drive means
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76732—Mould
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76866—Mould closing
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76872—Mould opening

Definitions

  • the present invention relates to an injection molding machine structure, and in particular to an injection molding machine structure precisely controlled by a digital hydraulic cylinder.
  • the frequency response speed of any system is inversely proportional to the cumulative lag time of all its links.
  • the injection molding machine uses PLC + valve + ordinary hydraulic cylinder to control the opening and closing of the mold.
  • the hydraulic cylinder is connected to the front plate of the injection platform of the injection molding machine.
  • the front end of the piston rod is fixed with a nut on the injection molding machine head plate.
  • the piston rod of the oil cylinder reciprocates. , to realize the forward and backward movement of the injection molding machine.
  • the control accuracy is relatively low and the response is relatively slow.
  • a single-stage preform injection molding machine injection platform mechanism disclosed in Chinese patent documents, its announcement number is CN113752463A, includes a base, the upper surface of the base is slidably connected to a mounting base, and the top of the mounting base is mounted with a material Bucket, the front of the mounting base is provided with an injection molding pass, a heating sleeve is installed on the arc surface of the injection molding pass, a conveying screw is installed inside the injection molding pass, and the tail end of the conveying screw protrudes from the rear end of the mounting base.
  • a motor is slidably connected to the rear end of the mounting base, the output end of the motor is connected to the tail end of the conveying screw, and injection hydraulic cylinders are symmetrically provided on both sides of the mounting base;
  • the disadvantage of this invention is that it When controlling the opening and closing of the mold, it is necessary to detect the position of the valve body through a position sensor and respond to the PLC system, and then drive the opening and closing of the mold of the injection molding machine through the movement of the piston rod of the hydraulic control cylinder. The response of the control process is slow, resulting in insufficient control accuracy.
  • the present invention is to overcome the problems in the existing technology that use ordinary oil cylinders to control the opening and closing of the injection molding machine, resulting in slow response speed and insufficient control accuracy. It provides an injection molding machine structure that is precisely controlled by a digital hydraulic cylinder, which can speed up the response. speed, thereby making the position accuracy of the injection head higher, thereby improving the quality of the product.
  • the present invention is an injection molding machine structure precisely controlled by a digital hydraulic cylinder, including an injection head adapted to the mold, and a digital hydraulic cylinder for opening and closing the mold.
  • the digital hydraulic cylinder includes a drive motor, a controller, and a valve body.
  • the valve body part is equipped with a liquid inlet, a liquid return port, an advance liquid outlet and a retreat liquid outlet.
  • the valve body is equipped with a valve sleeve and a valve stem.
  • the cylinder body is equipped with a piston chamber and a piston. , both ends of the piston cavity are provided with a carry liquid inlet and a retreat liquid inlet.
  • the carry liquid inlet and the carry liquid outlet are connected by a liquid inlet pipe, and the retreat liquid inlet and the retreat liquid outlet are connected by a liquid withdrawal pipe. connect.
  • This application uses a digital hydraulic cylinder to provide direct mechanical closed-loop feedback, with high control accuracy and fast response.
  • the ingenious combination makes it a whole and appears as an independent device to the outside world. Users do not need to be inertial about its internal structure and characteristics. They can easily master the use after only understanding the fixed relationship between input and output.
  • this one-piece digital cylinder has good integrity and It has strong anti-pollution ability, high precision, stability and reliability, and low overall cost; the digital hydraulic cylinder already has position closed-loop capability internally, so it no longer requires additional sensors for closed-loop control when achieving precise micron-level repeated positioning. Even in terms of speed control, due to the digitization of its movement characteristics, the pulse frequency corresponds to the movement speed characteristics of the digital hydraulic cylinder, which eliminates the need to use sensors to implement closed-loop control.
  • it also includes a hopper, an injection molding pass, and a heating sleeve located outside the injection molding pass.
  • a spiral conveying structure is provided inside the injection molding pass.
  • the spiral conveying structure is provided with a pressure feedback structure near the mold; through the pressure feedback structure , the pressure of transporting injection molding materials in the injection molding channel can be detected in time, and then the melting condition of the injection molding material can be judged.
  • the detected pressure exceeds the standard value, it means that the injection molding material in the injection molding channel has not completely melted, resulting in greater resistance to transportation, and
  • the corresponding signal is fed back to the controller through the pressure feedback structure, which can quickly detach the injection head from the mold to prevent incompletely melted material from entering the mold, resulting in unqualified product quality; when the injection head is detached from the mold , the heating sleeve still heats the material in the injection head.
  • part of the injection material at the end of the injection head flows back, causing the pressure at the pressure feedback structure to decrease again, thereby controlling the reset of the mold.
  • the spiral conveying structure includes a fixed conveying structure and a feedback conveying structure that can rotate synchronously.
  • the pressure feedback structure includes a pressure sensor.
  • the pressure sensor is installed at one end of the feedback conveying structure; when the injection molding material in the injection molding pass is not completely melted, due to the With greater resistance, the pressure on the pressure sensor increases and the corresponding signal is fed back to the controller.
  • the pressure generated by the spiral conveying structure at one end of the injection molding channel close to the hopper is smaller. Since at one end close to the hopper, the injection molding material in the injection molding channel will not be completely melted under normal circumstances, this structure reduces the sensing range of the pressure feedback, thereby improving the sensing accuracy.
  • the feedback conveying structure includes a guide rod portion that passes through the interior of the fixed conveying structure, a guide bar is provided on the outside of the guide bar portion, and a guide groove adapted to the guide bar is provided inside the fixed conveying structure; this structure allows The feedback conveying structure can have a certain degree of freedom in the axial direction, thereby ensuring that the pressure can be detected through the axial displacement.
  • the spiral conveying structure includes a spiral conveying groove, and the length of the spiral conveying groove on the feedback conveying structure accounts for 1/5-1/2 of the total length of the spiral conveying groove; if the length of the feedback conveying structure is relatively too small, it may cause the system to There is no time to respond, and the incompletely melted injection molding material has already entered the mold; if the length of the feedback conveying structure is relatively long, the sensing range of the pressure feedback will increase.
  • the injection molding machine structure also includes a conveying motor for driving the spiral conveying structure.
  • the driving motor is a double-ended shaft motor. One end of the driving motor is connected to the valve stem, and the other end is connected to the conveying clutch structure.
  • the conveying clutch structure It includes a clutch and a clutch transmission structure. One end of the clutch is connected to the output shaft of the conveyor motor, and the other end is connected to the screw conveyor. Structural connection; when the drive motor controls the injection head to separate from the mold, it also drives the clutch to move, thereby separating the spiral conveyor structure from the conveyor motor, causing the spiral conveyor structure to suspend conveying, preventing the material near the mold in the injection molding from being continuously pressurized.
  • the driving motor controls the mold to reset, it also causes the screw conveying structure and the conveying motor to cooperate again, causing the screw conveying structure to restart conveying.
  • the spiral conveying structure includes a rotating shaft and a spiral piece installed outside the rotating shaft.
  • the spiral piece forms a spiral conveying groove outside the rotating shaft.
  • the outer diameter of the rotating shaft on the feedback conveying structure gradually increases in the direction toward the mold; this structure makes The feedback conveying structure puts the injection molding material under increasing pressure when conveying it. Once the material is not completely melted, it is more likely to get stuck near the mold in the feedback conveying structure. In the process of continuing to melt, once the material is completely melted, , due to the high pressure near the mold, part of the material will flow back, causing the pressure on the pressure sensor to gradually recover; this structure ensures the reliability of the feedback.
  • the present invention has the following beneficial effects: (1) to speed up the response speed, thereby making the position accuracy of the injection molding head higher, thereby improving the quality of the product; (2) when part of the injection molding material in the injection molding barrel is not completely melted, it can Exit the injection molding head to prevent incompletely melted material from entering the mold or completely blocking the injection molding head. After the injection molding head exits and the injection molding material is completely re-melted, the injection molding head can be reset again.
  • Figure 1 is a front structural schematic diagram of the present invention.
  • Figure 2 is a schematic cross-sectional structural view of the digital hydraulic cylinder of the present invention.
  • Figure 3 is a partially enlarged view of the partial structure of Figure 2 of the digital hydraulic cylinder of the present invention.
  • Figure 4 is a schematic cross-sectional structural view of the injection molding barrel of the present invention.
  • Figure 5 is a schematic cross-sectional structural view of the clutch of the present invention.
  • an injection molding machine structure precisely controlled by a digital hydraulic cylinder includes a hopper 1, an injection barrel 2, a heating sleeve 3 covering the outside of the injection barrel, and a heating sleeve adapted to the mold.
  • the digital hydraulic cylinder 5 includes a drive motor 6, a controller, a valve body 7 and a cylinder 8.
  • the valve body is provided with a liquid inlet 9, a liquid return port 10, and a liquid inlet port 11. and a retreat liquid outlet 12.
  • a valve sleeve and a valve stem are installed in the valve body.
  • Both ends of the piston chamber are provided with a carry liquid inlet and a retreat liquid inlet.
  • the carry liquid inlet The liquid inlet and the inlet outlet are connected by a liquid inlet pipe 15, and the retreat liquid inlet and the liquid outlet are connected by a drain pipe 16;
  • the valve stem is a ball screw, and the valve sleeve is installed on the ball screw.
  • the nut sleeve on the stem, the structure of the valve sleeve is the existing technology
  • the drive motor is a servo motor or a stepper motor, when the drive motor rotates, the valve sleeve moves in the axial direction of the valve stem; according to the rotation direction of the drive motor, The delivery direction of hydraulic oil is different.
  • the injection molding tunnel is provided with a spiral conveying structure, and the spiral conveying structure is provided with a pressure feedback structure near the mold;
  • the spiral conveying structure includes a fixed conveying structure 17 and a feedback conveying structure 18 that can rotate synchronously, and the pressure feedback structure includes a pressure sensor 19.
  • the pressure sensor is installed at one end of the feedback conveying structure;
  • the feedback conveying structure includes a guide rod part 20, which passes through the inside of the fixed conveying structure.
  • the spiral conveyor structure includes a spiral conveyor trough, and the length of the spiral conveyor trough on the feedback conveyor structure accounts for 2/5 of the total length of the spiral conveyor trough.
  • the structure of the injection molding machine also includes a conveying motor 21 for driving the spiral conveying structure.
  • the driving motor is a double-ended shaft motor. One end of the driving motor is connected to the valve stem, and the other end is connected to the conveying clutch structure.
  • the conveying clutch structure includes a clutch. 22 and a clutch transmission structure 23. One end of the clutch is connected to the output shaft of the conveying motor, and the other end is connected to the spiral conveying structure; the spiral conveying structure includes a rotating shaft 24 and a spiral piece installed on the outside of the rotating shaft, and the spiral piece is on the outside of the rotating shaft.
  • a spiral conveying groove 25 is formed, and the outer diameter of the rotating shaft on the feedback conveying structure gradually increases in the direction toward the mold;
  • the clutch transmission structure includes a clutch screw rod and a clutch slider, and a push rod is used between the clutch slider and the clutch.
  • Connection; the clutch is provided with a clutch wheel 26, the clutch wheel is provided with a first clutch tooth on the side facing the spiral conveying structure, and one end of the rotating shaft is provided with a second clutch tooth that meshes with the first clutch tooth; clutch The wheel is connected to a clutch lever 27 on the side facing away from the spiral conveying structure.
  • One end of the clutch lever is connected to the output shaft of the conveying motor through a coupling 28.
  • the clutch lever is circumferentially connected to the coupling through a side limit rib 29. limit; the inside of the clutch is also provided with a ball 30 that contacts the outside of the coupling.
  • the pressure of the injection molding material transported in the injection molding tunnel can be detected instantly, and the melting condition of the injection molding material can be judged. If the detected pressure exceeds the standard value, it means that the injection molding in the injection molding The material is not completely melted, resulting in greater resistance to transportation.
  • the corresponding signal is fed back to the controller through the pressure feedback structure, which can quickly detach the injection head from the mold to prevent incompletely melted material from entering the mold and causing product damage.
  • the quality is unqualified; when the injection head is disconnected from the mold, the other end of the drive motor is also driving the clutch transmission structure to move, causing the clutch slider to move toward the conveying motor side; when the clutch slider moves, the clutch is pushed through the push rod.

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

Abstract

An injection molding machine structure precisely controlled via a digital hydraulic oil cylinder (5), relating to injection molding machine structures, and comprising an injection molding head (4) matched with a mold, and a digital hydraulic oil cylinder (5) used for opening and closing the mold. The digital hydraulic oil cylinder (5) comprises a driving motor (6), a controller, a valve body portion (7), and a cylinder body portion (8). The valve body portion (7) is provided with a liquid inlet (9), a liquid return port (10), an extending liquid inlet (11), and a retracting liquid outlet (12). The digital hydraulic oil cylinder (5) achieves direct mechanical closed-loop feedback, the control precision is high, the response is fast, and the higher the precision of the mold extending position of the injection molding machine is, the more stable a produced product is, thereby solving the problems in the prior art of low response speed and insufficient control precision caused by using common cylinders to control the opening and closing of molds in injection molding machines.

Description

一种通过数字液压油缸精密控制的注塑机结构An injection molding machine structure precisely controlled by a digital hydraulic cylinder 技术领域Technical field
本发明涉及一种注塑机结构，尤其是涉及一种通过数字液压油缸精密控制的注塑机结构。The present invention relates to an injection molding machine structure, and in particular to an injection molding machine structure precisely controlled by a digital hydraulic cylinder.
背景技术Background technique
任何***其频率响应速度均与其所有环节的累计滞后时间构成反比关系。现有技术中，注塑机控制开合模是采用PLC+阀+普通液压油缸，液压油缸连接在注塑机的射台前板上，活塞杆前端采用螺母固定注塑机头板上，油缸活塞杆往复运动，实现注塑机射台前进后退动作，再此过程中由于采用的是PLC+阀+普通液压油缸+位置传感器的外部间接闭环反馈，控制精度相对较低，响应相对较慢。The frequency response speed of any system is inversely proportional to the cumulative lag time of all its links. In the existing technology, the injection molding machine uses PLC + valve + ordinary hydraulic cylinder to control the opening and closing of the mold. The hydraulic cylinder is connected to the front plate of the injection platform of the injection molding machine. The front end of the piston rod is fixed with a nut on the injection molding machine head plate. The piston rod of the oil cylinder reciprocates. , to realize the forward and backward movement of the injection molding machine. In this process, since the external indirect closed-loop feedback of PLC + valve + ordinary hydraulic cylinder + position sensor is used, the control accuracy is relatively low and the response is relatively slow.
例如，在中国专利文献上公开的“一种单阶瓶坯注塑机射台机构”，其公告号为CN113752463A，包括底座，所述底座上表面滑动连接有安装座，所述安装座顶端安装有料斗，所述安装座正面设有注塑通，所述注塑通圆弧面上安装有加热套筒，所述注塑通内部安装有输送螺杆，所述输送螺杆的尾端从安装座后端探出，所述安装座后端滑动连接有马达，所述马达的输出端与输送螺杆的尾端连接在一起，所述安装座两侧对称设有注射液压缸；该发明的不足之处在于，其在控制开合模时，需要通过位置传感器检测阀***置，并反应给PLC***，再通过液压控制油缸活塞杆运动带动注塑机模具开合，控制过程响应较慢，导致控制精度不足。For example, "a single-stage preform injection molding machine injection platform mechanism" disclosed in Chinese patent documents, its announcement number is CN113752463A, includes a base, the upper surface of the base is slidably connected to a mounting base, and the top of the mounting base is mounted with a material Bucket, the front of the mounting base is provided with an injection molding pass, a heating sleeve is installed on the arc surface of the injection molding pass, a conveying screw is installed inside the injection molding pass, and the tail end of the conveying screw protrudes from the rear end of the mounting base. , a motor is slidably connected to the rear end of the mounting base, the output end of the motor is connected to the tail end of the conveying screw, and injection hydraulic cylinders are symmetrically provided on both sides of the mounting base; the disadvantage of this invention is that it When controlling the opening and closing of the mold, it is necessary to detect the position of the valve body through a position sensor and respond to the PLC system, and then drive the opening and closing of the mold of the injection molding machine through the movement of the piston rod of the hydraulic control cylinder. The response of the control process is slow, resulting in insufficient control accuracy.
发明内容Contents of the invention
本发明是为了克服现有技术中，通过普通油缸控制注塑机的开合模，导致响应速度较慢，控制精度不足的问题，提供一种通过数字液压油缸精密控制的注塑机结构，可以加快响应速度，从而使得注塑头的位置精度更高，进而提高产品的质量。The present invention is to overcome the problems in the existing technology that use ordinary oil cylinders to control the opening and closing of the injection molding machine, resulting in slow response speed and insufficient control accuracy. It provides an injection molding machine structure that is precisely controlled by a digital hydraulic cylinder, which can speed up the response. speed, thereby making the position accuracy of the injection head higher, thereby improving the quality of the product.
为了实现上述目的，本发明采用以下技术方案：In order to achieve the above objects, the present invention adopts the following technical solutions:
本发明，一种通过数字液压油缸精密控制的注塑机结构，包括与模具适配的注塑头，以及用于开合模具的数字液压油缸，所述数字液压油缸包括驱动电机、控制器、阀体部和缸体部，阀体部上设有进液口、回液口、进位出液口和退位出液口，阀体部内安装有阀套和阀杆，缸体部内上有活塞腔和活塞，活塞腔的两端设有进位进液口和退位进液口，进位进液口和进位出液口之间通过进液管道相连，退位进液口和退位出液口之间通过退液管道连接。The present invention is an injection molding machine structure precisely controlled by a digital hydraulic cylinder, including an injection head adapted to the mold, and a digital hydraulic cylinder for opening and closing the mold. The digital hydraulic cylinder includes a drive motor, a controller, and a valve body. The valve body part is equipped with a liquid inlet, a liquid return port, an advance liquid outlet and a retreat liquid outlet. The valve body is equipped with a valve sleeve and a valve stem. The cylinder body is equipped with a piston chamber and a piston. , both ends of the piston cavity are provided with a carry liquid inlet and a retreat liquid inlet. The carry liquid inlet and the carry liquid outlet are connected by a liquid inlet pipe, and the retreat liquid inlet and the retreat liquid outlet are connected by a liquid withdrawal pipe. connect.
本申请通过数字液压油缸直接机械闭环反馈，控制精度高，响应快，而注塑机和模具顶出位置精度越高，生产出来的产品越稳定；数字液压油缸是将：阀、缸、反馈与驱动控制 巧妙的组合未一个整体，对外体现为一个独立的器件，用户无需惯性其内部构成与特性，仅了解输入输出固定的关系后，即可轻松掌握使用，并且这种一体式数字缸整体性好、抗污染能力强、精度高、稳定可靠、综合成本低廉；数字液压油缸由于其内部已经具有了位置闭环能力，因此其实现精确的微米级重复定位时就不再需要额外的传感器对其闭环控制，即使是在速度控制上，由于其运动特性的数字化，脉冲频率对应数字液压缸的运动速度特性，也使得其不必再采用传感器对其实施闭环控制。This application uses a digital hydraulic cylinder to provide direct mechanical closed-loop feedback, with high control accuracy and fast response. The higher the accuracy of the ejection position of the injection molding machine and mold, the more stable the product produced; the digital hydraulic cylinder combines: valve, cylinder, feedback and drive control The ingenious combination makes it a whole and appears as an independent device to the outside world. Users do not need to be inertial about its internal structure and characteristics. They can easily master the use after only understanding the fixed relationship between input and output. Moreover, this one-piece digital cylinder has good integrity and It has strong anti-pollution ability, high precision, stability and reliability, and low overall cost; the digital hydraulic cylinder already has position closed-loop capability internally, so it no longer requires additional sensors for closed-loop control when achieving precise micron-level repeated positioning. Even in terms of speed control, due to the digitization of its movement characteristics, the pulse frequency corresponds to the movement speed characteristics of the digital hydraulic cylinder, which eliminates the need to use sensors to implement closed-loop control.
作为优选，还包括料斗、注塑通，以及位于注塑通外侧的加热套筒，注塑通内设有螺旋输送结构，螺旋输送结构在靠近模具处上设有压力反馈结构；通过所述的压力反馈结构，可以及时检测注塑通内运送注塑材料的压力，进而判断注塑材料的熔融情况，若检测到的压力超过标准值，说明注塑通内的注塑材料没有熔融完全导致运送所受的阻力较大，而通过压力反馈结构将对应的信号反馈到控制器中，可以使得注塑头迅速与模具脱开，以避免没有熔融完全的材料进入模具，导致产品质量不合格的情况；当注塑头与模具脱开后，加热套筒仍对注塑头内材料进行加热，当注塑材料熔融完全后，注塑头端部的部分注塑材料回流，使得压力反馈结构处受到的压力再次减小，进而控制模具复位。Preferably, it also includes a hopper, an injection molding pass, and a heating sleeve located outside the injection molding pass. A spiral conveying structure is provided inside the injection molding pass. The spiral conveying structure is provided with a pressure feedback structure near the mold; through the pressure feedback structure , the pressure of transporting injection molding materials in the injection molding channel can be detected in time, and then the melting condition of the injection molding material can be judged. If the detected pressure exceeds the standard value, it means that the injection molding material in the injection molding channel has not completely melted, resulting in greater resistance to transportation, and The corresponding signal is fed back to the controller through the pressure feedback structure, which can quickly detach the injection head from the mold to prevent incompletely melted material from entering the mold, resulting in unqualified product quality; when the injection head is detached from the mold , the heating sleeve still heats the material in the injection head. When the injection material is completely melted, part of the injection material at the end of the injection head flows back, causing the pressure at the pressure feedback structure to decrease again, thereby controlling the reset of the mold.
作为优选，螺旋输送结构包括可同步转动的固定输送结构和反馈输送结构，压力反馈结构包括压力传感器，压力传感器安装在反馈输送结构的一端；当注塑通内的注塑材料没有熔融完全时，由于受到较大的阻力，压力传感器所受的压力增加，并将对应信号反馈到控制器中，而当注塑材料完全熔融时，所述螺旋输送结构在注塑通内靠近料斗的一端产生的压力较小，由于在靠近料斗的一端，注塑通内注塑材料在正常情况下也不会熔融完全，该结构使得压力反馈的感应范围减小，进而使得感应精度提高。Preferably, the spiral conveying structure includes a fixed conveying structure and a feedback conveying structure that can rotate synchronously. The pressure feedback structure includes a pressure sensor. The pressure sensor is installed at one end of the feedback conveying structure; when the injection molding material in the injection molding pass is not completely melted, due to the With greater resistance, the pressure on the pressure sensor increases and the corresponding signal is fed back to the controller. When the injection molding material is completely melted, the pressure generated by the spiral conveying structure at one end of the injection molding channel close to the hopper is smaller. Since at one end close to the hopper, the injection molding material in the injection molding channel will not be completely melted under normal circumstances, this structure reduces the sensing range of the pressure feedback, thereby improving the sensing accuracy.
作为优选，反馈输送结构包括导杆部，所述导杆部穿过固定输送结构内部，导杆部外侧设有导向筋，固定输送结构内部设有与导向筋适配的导向槽；该结构使得反馈输送结构可以在轴向方向上具有一定的自由度，从而确保可以通过轴向位移量来检测压力。Preferably, the feedback conveying structure includes a guide rod portion that passes through the interior of the fixed conveying structure, a guide bar is provided on the outside of the guide bar portion, and a guide groove adapted to the guide bar is provided inside the fixed conveying structure; this structure allows The feedback conveying structure can have a certain degree of freedom in the axial direction, thereby ensuring that the pressure can be detected through the axial displacement.
作为优选，螺旋输送结构包括螺旋输送槽，反馈输送结构上的螺旋输送槽的长度占螺旋输送槽总长度的1/5-1/2；若反馈输送结构的长度相对过小，可能会导致***来不及响应，未完全熔融的注塑材料已经进入模具的情况；若反馈输送结构的长度相对过长，则会导致压力反馈的感应范围增加。Preferably, the spiral conveying structure includes a spiral conveying groove, and the length of the spiral conveying groove on the feedback conveying structure accounts for 1/5-1/2 of the total length of the spiral conveying groove; if the length of the feedback conveying structure is relatively too small, it may cause the system to There is no time to respond, and the incompletely melted injection molding material has already entered the mold; if the length of the feedback conveying structure is relatively long, the sensing range of the pressure feedback will increase.
作为优选，注塑机结构还包括用于驱动螺旋输送结构的输送电机，所述驱动电机为双头轴电机，驱动电机的一端与阀杆连接，另一端与输送离合结构连接，所述输送离合结构包括离合器和离合传动结构，离合器的一端与所述输送电机的输出轴连接，另一端与螺旋输送 结构连接；当驱动电机控制注塑头与模具分离时，也同时带动离合器移动，从而使得螺旋输送结构与输送电机分离，使得螺旋输送结构暂停输送，避免注塑通内靠近模具处的材料持续加压，而当驱动电机控制模具复位时，也同时使得螺旋输送结构与输送电机再次配合，使螺旋输送结构重新开始输送。Preferably, the injection molding machine structure also includes a conveying motor for driving the spiral conveying structure. The driving motor is a double-ended shaft motor. One end of the driving motor is connected to the valve stem, and the other end is connected to the conveying clutch structure. The conveying clutch structure It includes a clutch and a clutch transmission structure. One end of the clutch is connected to the output shaft of the conveyor motor, and the other end is connected to the screw conveyor. Structural connection; when the drive motor controls the injection head to separate from the mold, it also drives the clutch to move, thereby separating the spiral conveyor structure from the conveyor motor, causing the spiral conveyor structure to suspend conveying, preventing the material near the mold in the injection molding from being continuously pressurized. When the driving motor controls the mold to reset, it also causes the screw conveying structure and the conveying motor to cooperate again, causing the screw conveying structure to restart conveying.
作为优选，螺旋输送结构包括转轴和安装在转轴外侧的螺旋片，所述螺旋片在转轴外侧形成螺旋输送槽，反馈输送结构上转轴的外径在朝向模具的方向上逐渐增大；该结构使得反馈输送结构在输送注塑材料时使注塑材料受到的压力越来越大，一旦材料没有熔融完全，更容易在反馈输送结构靠近模具处卡死，而在继续熔融的过程中，一旦材料完全熔融后，由于靠近模具处压力较大，部分材料会回流，从而使得压力传感器上的压力逐渐恢复；该结构确保了反馈的可靠性。Preferably, the spiral conveying structure includes a rotating shaft and a spiral piece installed outside the rotating shaft. The spiral piece forms a spiral conveying groove outside the rotating shaft. The outer diameter of the rotating shaft on the feedback conveying structure gradually increases in the direction toward the mold; this structure makes The feedback conveying structure puts the injection molding material under increasing pressure when conveying it. Once the material is not completely melted, it is more likely to get stuck near the mold in the feedback conveying structure. In the process of continuing to melt, once the material is completely melted, , due to the high pressure near the mold, part of the material will flow back, causing the pressure on the pressure sensor to gradually recover; this structure ensures the reliability of the feedback.
因此，本发明具有如下有益效果：(1)以加快响应速度，从而使得注塑头的位置精度更高，进而提高产品的质量；(2)当注塑筒内部分注塑材料没有熔融完全时，可以将注塑头退出，避免未熔融完全的材料进入模具，或完全卡死注塑头，注塑头退出后，注塑材料重新熔融完全后，注塑头可以再次复位。Therefore, the present invention has the following beneficial effects: (1) to speed up the response speed, thereby making the position accuracy of the injection molding head higher, thereby improving the quality of the product; (2) when part of the injection molding material in the injection molding barrel is not completely melted, it can Exit the injection molding head to prevent incompletely melted material from entering the mold or completely blocking the injection molding head. After the injection molding head exits and the injection molding material is completely re-melted, the injection molding head can be reset again.
附图说明Description of drawings
图1是本发明的一种主视结构示意图。Figure 1 is a front structural schematic diagram of the present invention.
图2是本发明数字液压油缸的一种剖视结构示意图。Figure 2 is a schematic cross-sectional structural view of the digital hydraulic cylinder of the present invention.
图3是本发明数字液压油缸对图2部分结构的一种局部放大图。Figure 3 is a partially enlarged view of the partial structure of Figure 2 of the digital hydraulic cylinder of the present invention.
图4是本发明注塑筒内的一种剖视结构示意图。Figure 4 is a schematic cross-sectional structural view of the injection molding barrel of the present invention.
图5是本发明离合器处的一种剖视结构示意图。Figure 5 is a schematic cross-sectional structural view of the clutch of the present invention.
图中：1、料斗 2、注塑筒 3、加热套筒 4、注塑头 5、数字液压油缸 6、驱动电机 7、阀体部 8、缸体部 9、进液口 10、回液口 11、进位出液口 12、退位出液口 13、活塞腔 14、活塞 15、进液管道 16、退液管道 17、固定输送结构 18、反馈输送结构 19、压力传感器 20、导杆部 21、输送电机 22、离合器 23、离合传动结构 24、转轴 25、螺旋输送槽 26、离合轮 27、离合杆 28、联轴器 29、侧边限位筋 30、滚珠。In the picture: 1. Hopper 2. Injection barrel 3. Heating sleeve 4. Injection head 5. Digital hydraulic cylinder 6. Drive motor 7. Valve body 8. Cylinder 9. Liquid inlet 10. Liquid return port 11. Advance liquid outlet 12, Retreat liquid outlet 13, Piston chamber 14, Piston 15, Liquid inlet pipe 16, Liquid withdrawal pipe 17, Fixed conveying structure 18, Feedback conveying structure 19, Pressure sensor 20, Guide rod part 21, Conveying motor 22. Clutch 23. Clutch transmission structure 24. Rotating shaft 25. Spiral conveyor groove 26. Clutch wheel 27. Clutch lever 28. Coupling 29. Side limit ribs 30. Balls.
具体实施方式Detailed ways
下面结合附图与具体实施方式对本发明做进一步的描述。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1-5所示的实施例中，一种通过数字液压油缸精密控制的注塑机结构，包括料斗1、注塑筒2、包覆在注塑筒外侧的加热套筒3、与模具适配的注塑头4，以及用于开合模具 的数字液压油缸5，所述数字液压油缸包括驱动电机6、控制器、阀体部7和缸体部8，阀体部上设有进液口9、回液口10、进位出液口11和退位出液口12，阀体部内安装有阀套和阀杆，缸体部内上有活塞腔13和活塞14，活塞腔的两端设有进位进液口和退位进液口，进位进液口和进位出液口之间通过进液管道15相连，退位进液口和退位出液口之间通过退液管道16连接；所述阀杆为滚珠丝杆，而阀套为安装在滚珠丝杆上的螺母套，阀套的结构为现有技术，驱动电机为伺服电机或步进电机，当驱动电机转动时，阀套在阀杆的轴向方向上移动；根据驱动电机的旋转方向，液压油的输送方向不同，当驱动电机正向转动时，进液口和进位出液口连通，回液口和退位出液口连通，液压油通过进液管道进入缸体部，使得活塞推动模具朝向注塑头方向移动，待注塑头将模具中的阀口开启后，数字液压油缸随即停止移动，完成液压缸直线移动时对电控步进电机或伺服电机转角的跟踪，过程中实现了力矩放大；而当驱动电机反向转动时，进液口和退位出液口连通，回液口和进位出液口连通，液压油通过退液管道进入缸体部，使得活塞推动模具远离注塑头移动。In the embodiment shown in Figures 1-5, an injection molding machine structure precisely controlled by a digital hydraulic cylinder includes a hopper 1, an injection barrel 2, a heating sleeve 3 covering the outside of the injection barrel, and a heating sleeve adapted to the mold. Injection head 4, as well as for opening and closing the mold The digital hydraulic cylinder 5 includes a drive motor 6, a controller, a valve body 7 and a cylinder 8. The valve body is provided with a liquid inlet 9, a liquid return port 10, and a liquid inlet port 11. and a retreat liquid outlet 12. A valve sleeve and a valve stem are installed in the valve body. There are a piston chamber 13 and a piston 14 in the cylinder body. Both ends of the piston chamber are provided with a carry liquid inlet and a retreat liquid inlet. The carry liquid inlet The liquid inlet and the inlet outlet are connected by a liquid inlet pipe 15, and the retreat liquid inlet and the liquid outlet are connected by a drain pipe 16; the valve stem is a ball screw, and the valve sleeve is installed on the ball screw. The nut sleeve on the stem, the structure of the valve sleeve is the existing technology, the drive motor is a servo motor or a stepper motor, when the drive motor rotates, the valve sleeve moves in the axial direction of the valve stem; according to the rotation direction of the drive motor, The delivery direction of hydraulic oil is different. When the drive motor rotates forward, the liquid inlet and the advance liquid outlet are connected, and the liquid return port and the retreat liquid outlet are connected. The hydraulic oil enters the cylinder through the liquid inlet pipe, causing the piston to push the mold. Move towards the direction of the injection molding head. After the injection molding head opens the valve port in the mold, the digital hydraulic cylinder stops moving and completes the tracking of the electronically controlled stepper motor or servo motor angle when the hydraulic cylinder moves linearly. In the process, torque amplification is achieved. ; When the drive motor rotates in the reverse direction, the liquid inlet and the retreat liquid outlet are connected, and the liquid return port and the advance liquid outlet are connected. The hydraulic oil enters the cylinder through the liquid retreat pipe, causing the piston to push the mold away from the injection head.
所述注塑通内设有螺旋输送结构，螺旋输送结构在靠近模具处设有压力反馈结构；螺旋输送结构包括可同步转动的固定输送结构17和反馈输送结构18，压力反馈结构包括压力传感器19，压力传感器安装在反馈输送结构的一端；反馈输送结构包括导杆部20，所述导杆部穿过固定输送结构内部，导杆部外侧设有导向筋，固定输送结构内部设有与导向筋适配的导向槽；螺旋输送结构包括螺旋输送槽，反馈输送结构上的螺旋输送槽的长度占螺旋输送槽总长度的2/5。The injection molding tunnel is provided with a spiral conveying structure, and the spiral conveying structure is provided with a pressure feedback structure near the mold; the spiral conveying structure includes a fixed conveying structure 17 and a feedback conveying structure 18 that can rotate synchronously, and the pressure feedback structure includes a pressure sensor 19. The pressure sensor is installed at one end of the feedback conveying structure; the feedback conveying structure includes a guide rod part 20, which passes through the inside of the fixed conveying structure. There are guide ribs on the outside of the guide rod part, and there are guide ribs inside the fixed conveying structure. Equipped with guide trough; the spiral conveyor structure includes a spiral conveyor trough, and the length of the spiral conveyor trough on the feedback conveyor structure accounts for 2/5 of the total length of the spiral conveyor trough.
注塑机结构还包括用于驱动螺旋输送结构的输送电机21，所述驱动电机为双头轴电机，驱动电机的一端与阀杆连接，另一端与输送离合结构连接，所述输送离合结构包括离合器22和离合传动结构23，离合器的一端与所述输送电机的输出轴连接，另一端与螺旋输送结构连接；旋输送结构包括转轴24和安装在转轴外侧的螺旋片，所述螺旋片在转轴外侧形成螺旋输送槽25，反馈输送结构上转轴的外径在朝向模具的方向上逐渐增大；所述离合传动结构包括离合丝杆和离合滑块，所述离合滑块与离合器之间通过推杆连接；离合器内设有离合轮26，离合轮在朝向螺旋输送结构的一侧上设有第一离合齿，所述转轴的一端设有与所述第一离合齿啮合的第二离合齿；离合轮在背向螺旋输送结构的一侧处连接有离合杆27，离合杆的一端通过联轴器28与输送电机的输出轴相连，离合杆通过侧边限位筋29与联轴器进行周向限位；离合器内侧还设有与联轴器外侧接触的滚珠30。The structure of the injection molding machine also includes a conveying motor 21 for driving the spiral conveying structure. The driving motor is a double-ended shaft motor. One end of the driving motor is connected to the valve stem, and the other end is connected to the conveying clutch structure. The conveying clutch structure includes a clutch. 22 and a clutch transmission structure 23. One end of the clutch is connected to the output shaft of the conveying motor, and the other end is connected to the spiral conveying structure; the spiral conveying structure includes a rotating shaft 24 and a spiral piece installed on the outside of the rotating shaft, and the spiral piece is on the outside of the rotating shaft. A spiral conveying groove 25 is formed, and the outer diameter of the rotating shaft on the feedback conveying structure gradually increases in the direction toward the mold; the clutch transmission structure includes a clutch screw rod and a clutch slider, and a push rod is used between the clutch slider and the clutch. Connection; the clutch is provided with a clutch wheel 26, the clutch wheel is provided with a first clutch tooth on the side facing the spiral conveying structure, and one end of the rotating shaft is provided with a second clutch tooth that meshes with the first clutch tooth; clutch The wheel is connected to a clutch lever 27 on the side facing away from the spiral conveying structure. One end of the clutch lever is connected to the output shaft of the conveying motor through a coupling 28. The clutch lever is circumferentially connected to the coupling through a side limit rib 29. limit; the inside of the clutch is also provided with a ball 30 that contacts the outside of the coupling.
在整个注塑过程中，通过所述的压力反馈结构，可以即时检测注塑通内运送注塑材料的压力，进而判断注塑材料的熔融情况。若检测到的压力超过标准值，说明注塑通内的注塑 材料没有熔融完全导致运送所受的阻力较大，而通过压力反馈结构将对应的信号反馈到控制器中，可以使得注塑头迅速与模具脱开，以避免没有熔融完全的材料进入模具，导致产品质量不合格的情况；当注塑头与模具脱开的过程中，驱动电机的另一头也在带动离合传动结构运动，使得离合滑块朝向输送电机侧移动；离合滑块移动时通过推杆推动离合器朝向输送电机侧移动，从而使得转轴与离合轮分离，此时，离合轮处于空转状态，螺旋输送结构不再继续推动注塑材料，以免注塑筒内压力进一步增加，同时，加热套筒仍然保持注塑材料的加热，待注塑材料完全熔融后，注塑筒靠近模具侧的部分注塑材料会朝向输送电机侧回流，使得反馈输送结构压力减小；待检测到的压力小于设定值时，说明注塑筒内注塑材料已经完全熔融，此时，驱动电机再次带动模具与注塑头配合，同时使得离合轮与转轴配合，注塑过程和螺旋输送过程同时重启。 During the entire injection molding process, through the pressure feedback structure, the pressure of the injection molding material transported in the injection molding tunnel can be detected instantly, and the melting condition of the injection molding material can be judged. If the detected pressure exceeds the standard value, it means that the injection molding in the injection molding The material is not completely melted, resulting in greater resistance to transportation. The corresponding signal is fed back to the controller through the pressure feedback structure, which can quickly detach the injection head from the mold to prevent incompletely melted material from entering the mold and causing product damage. The quality is unqualified; when the injection head is disconnected from the mold, the other end of the drive motor is also driving the clutch transmission structure to move, causing the clutch slider to move toward the conveying motor side; when the clutch slider moves, the clutch is pushed through the push rod. Move towards the conveying motor side, thereby separating the rotating shaft from the clutch wheel. At this time, the clutch wheel is in an idling state, and the spiral conveying structure no longer continues to push the injection molding material to prevent the pressure in the injection molding barrel from further increasing. At the same time, the heating sleeve still maintains the injection molding material. After the injection molding material is completely melted, the part of the injection molding material near the mold side of the injection molding barrel will flow back toward the conveying motor side, causing the pressure of the feedback conveying structure to decrease; when the detected pressure is less than the set value, it means that the injection molding in the injection barrel is The material has been completely melted. At this time, the drive motor once again drives the mold to cooperate with the injection head, and at the same time makes the clutch wheel cooperate with the rotating shaft. The injection molding process and the screw conveying process are restarted at the same time.

Claims (7)

  1. 一种通过数字液压油缸精密控制的注塑机结构，其特征是，包括与模具适配的注塑头，以及用于开合模具的数字液压油缸，所述数字液压油缸包括驱动电机、控制器、阀体部和缸体部，阀体部上设有进液口、回液口、进位出液口和退位出液口，阀体部内安装有阀套和阀杆，缸体部内上有活塞腔和活塞，活塞腔的两端设有进位进液口和退位进液口，进位进液口和进位出液口之间通过进液管道相连，退位进液口和退位出液口之间通过退液管道连接。An injection molding machine structure precisely controlled by a digital hydraulic cylinder, which is characterized by including an injection head adapted to the mold, and a digital hydraulic cylinder for opening and closing the mold. The digital hydraulic cylinder includes a drive motor, a controller, and a valve. body and cylinder. The valve body is equipped with a liquid inlet, a liquid return port, an advance liquid outlet and a retreat liquid outlet. The valve body is equipped with a valve sleeve and valve stem. The cylinder body is equipped with a piston cavity and a valve stem. The piston has a carry liquid inlet and a retreat liquid inlet at both ends of the piston cavity. The carry liquid inlet and the carry liquid outlet are connected by a liquid inlet pipe. The retreat liquid inlet and the retreat liquid outlet are connected by a liquid withdrawal pipe. Pipe connections.
  2. 根据权利要求1所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，还包括料斗、注塑通，以及位于注塑通外侧的加热套筒，注塑通内设有螺旋输送结构，螺旋输送结构在靠近模具处设有压力反馈结构。An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 1, characterized in that it also includes a hopper, an injection molding pass, and a heating sleeve located outside the injection molding pass, and a spiral conveying structure is provided inside the injection molding pass. The spiral conveying structure is equipped with a pressure feedback structure close to the mold.
  3. 根据权利要求2所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，螺旋输送结构包括可同步转动的固定输送结构和反馈输送结构，压力反馈结构包括压力传感器，压力传感器安装在反馈输送结构的一端。An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 2, characterized in that the spiral conveying structure includes a synchronously rotatable fixed conveying structure and a feedback conveying structure, the pressure feedback structure includes a pressure sensor, and the pressure sensor is installed at one end of the feedback delivery structure.
  4. 根据权利要求3所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，反馈输送结构包括导杆部，所述导杆部穿过固定输送结构内部，导杆部外侧设有导向筋，固定输送结构内部设有与导向筋适配的导向槽。An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 3, characterized in that the feedback conveying structure includes a guide rod part, the guide rod part passes through the inside of the fixed conveying structure, and the guide rod part is provided with Guide ribs, the fixed conveying structure is equipped with guide grooves that match the guide ribs.
  5. 根据权利要求2所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，螺旋输送结构包括螺旋输送槽，反馈输送结构上的螺旋输送槽的长度占螺旋输送槽总长度的1/5-1/2。An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 2, characterized in that the spiral conveying structure includes a spiral conveying groove, and the length of the spiral conveying groove on the feedback conveying structure accounts for 1% of the total length of the spiral conveying groove. /5-1/2.
  6. 根据权利要求2所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，注塑机结构还包括用于驱动螺旋输送结构的输送电机，所述驱动电机为双头轴电机，驱动电机的一端与阀杆连接，另一端与输送离合结构连接，所述输送离合结构包括离合器和离合传动结构，离合器的一端与所述输送电机的输出轴连接，另一端与螺旋输送结构连接。An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 2, characterized in that the injection molding machine structure further includes a conveying motor for driving the spiral conveying structure, and the driving motor is a double-headed shaft motor. One end of the motor is connected to the valve stem, and the other end is connected to the conveying clutch structure. The conveying clutch structure includes a clutch and a clutch transmission structure. One end of the clutch is connected to the output shaft of the conveying motor, and the other end is connected to the spiral conveying structure.
  7. 根据权利要求3所述的一种通过数字液压油缸精密控制的注塑机结构，其特征是，螺旋输送结构包括转轴和安装在转轴外侧的螺旋片，所述螺旋片在转轴外侧形成螺旋输送槽，反馈输送结构上转轴的外径在朝向模具的方向上逐渐增大。 An injection molding machine structure precisely controlled by a digital hydraulic cylinder according to claim 3, characterized in that the spiral conveying structure includes a rotating shaft and a spiral plate installed outside the rotating shaft, and the spiral plate forms a spiral conveying groove outside the rotating shaft, The outer diameter of the rotating shaft on the feedback conveying structure gradually increases toward the mold.
PCT/CN2023/081892 2022-08-25 2023-03-16 Injection molding machine structure precisely controlled via digital hydraulic oil cylinder WO2024040943A1 (en)

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