阅读说明：本技术 注射成型机及注射速度控制方法 (Injection molding machine and injection speed control method ) 是由 张何平 孙琪 张二勇 孙中航 李冬胜 李旭培 陈晓丽 宋晓光 朱龙举 娄海东 王 于 2018-06-26 设计创作，主要内容包括：本发明提供了注射成型机及注射速度控制方法,属于树脂注射成型技术领域,注射成型机包括用于混合物料的混料容器,混料容器具有出料口,注射成型机还包括用于测量混料容器内的物料重量的称重装置,称重装置连接有用于根据称重装置的重量变化计算注射速度的重量信息处理单元,混料容器连接有用于控制出料口注射速度的注射速度控制装置。通过对混料容器内的物料进行称重,得出单位时间内混料容器内的物料的重量变化量,然后通过重量变化量计算出物料的注射速度,进而根据实际测得的注射速度与预设速度的差值对应的增大或减小物料的注射速度,实现对物料的注射速度的控制。(The invention provides an injection molding machine and an injection speed control method, belonging to the technical field of resin injection molding. Through weighing the material in the compounding container, obtain the weight variation of the material in the compounding container in the unit interval, then calculate the injection speed of material through the weight variation, and then the injection speed that the difference that corresponds according to the injection speed that actually measures and predetermine speed or reduce the material realizes the control to the injection speed of material.)

1. Injection moulding machine, including being used for mixing or holding the compounding container of material, the compounding container has the discharge gate, its characterized in that: the injection molding machine further comprises a weighing device used for measuring the weight of the materials in the mixing container, the weighing device is connected with a weight information processing unit used for calculating the injection speed according to the weight change of the weighing device, and the mixing container is connected with an injection speed control device used for controlling the injection speed of the discharge port.

2. The injection molding machine of claim 1, wherein: the weight information processing unit is in signal connection with the injection speed control device so as to automatically control the injection speed of the discharge port according to the information of the weight information processing unit.

3. The injection molding machine according to claim 1 or 2, wherein: the injection speed control device comprises an air inlet, an air outlet and an air inlet valve, wherein the air inlet is arranged on the mixing container and used for communicating an air source with an inner cavity of the mixing container, the air outlet is used for communicating the outside of the mixing container with the inner cavity of the mixing container, the injection speed control device further comprises an air inlet valve and an exhaust valve, the air inlet valve is used for sealing the air inlet when the injection speed of the material is too large, and the exhaust valve is used for sealing the exhaust port when the injection speed of the material is.

4. The injection molding machine according to claim 1 or 2, wherein: the weighing device is an electronic scale which is arranged below the mixing container and is used for measuring the weight of the materials in the mixing container and the mixing container at the same time.

5. The injection molding machine according to claim 1 or 2, wherein: the mixing container is provided with a support for supporting the mixing container and a travelling wheel arranged at the support leg of the support.

6. The injection molding machine according to claim 1 or 2, wherein: the weight information processing unit includes a display device for displaying injection speed information.

7. An injection speed control method comprising the steps of: (1) continuously weighing the weight of the materials in the mixing container, and calculating the injection speed of the materials according to the weight variation of the materials; (2) and comparing the measured and calculated injection speed with a preset injection speed, if the measured and calculated injection speed is greater than the preset injection speed, reducing the injection speed through an injection speed control device, and otherwise, if the measured and calculated injection speed is less than the preset injection speed, increasing the injection speed through the injection speed control device.

8. The injection speed control method according to claim 7, characterized in that: the injection speed control device is automatically controlled.

9. The injection speed control method according to claim 7 or 8, characterized in that: when weighing the weight of the materials in the mixing container, weighing the mixing container simultaneously, and calculating the variation of the total weight of the materials and the mixing container to obtain the variation of the weight of the materials.

Technical Field

The invention relates to an injection molding machine and an injection speed control method.

Background

The APG (automatic Pressure Gelation) epoxy resin molding technology is a new epoxy resin molding technology developed in China in recent years, and the core of the method is to inject raw materials in a mixing trolley into a mold through air positive Pressure and heat-mold the mold by a molding machine. The injection molding cycle generally includes a metering step, a mold closing step, an injection step in which the injection speed of the epoxy resin is closely related to the appearance and quality of the product, a pressure holding step, a mold releasing step, and a post-processing step. The APG technology is similar to thermoplastic injection technology, and includes mixing various materials in a material mixing container, vacuum degassing, injecting the material liquid into mold under certain air pressure to fill the mold cavity, and curing at relatively high mold temperature. The mixture is injected too fast, the mould is not exhausted in time, the product bubble and other defects are easy to cause, and the product quality is greatly influenced. However, if the mixture is injected too slowly, the mixture injected first undergoes a curing reaction, which is likely to cause the defects of layering, unsatisfactory injection, etc., and also seriously affects the product quality. In summary, control of the injection rate is a very critical parameter in the production of the product.

Currently, the method for adjusting the injection speed of the mixture is as follows: firstly, the injection speed is manually judged, and then the exhaust valve or the air inlet valve is manually opened to increase or decrease the pressure in the mixing tank, so that the control of the mixture injection speed is realized. However, the control method adopts manual work to judge that the subjectivity is high, the injection speed regulation reliability is poor, and the manual operation of the valve for pressurization and depressurization increases the labor capacity of workers.

Disclosure of Invention

The invention aims to provide an injection molding machine, which aims to solve the problem that the reliability of the injection speed is poor by the current manual subjective judgment; in addition, the invention also aims to provide an injection speed control method.

In order to achieve the above object, the injection molding machine of the present invention has the technical scheme that:

the injection molding machine comprises a mixing container for mixing materials, the mixing container is provided with a discharge hole, the injection molding machine further comprises a weighing device for measuring the weight of the materials in the mixing container, the weighing device is connected with a weight information processing unit for calculating the injection speed according to the weight change of the weighing device, and the mixing container is connected with an injection speed control device for controlling the injection speed of the discharge hole.

The invention has the beneficial effects that: through weighing the material in the compounding container, obtain the weight variation of the material in the compounding container in the unit interval, then calculate the injection speed of material through the weight variation, and then the injection speed that the difference that corresponds according to the injection speed that actually records and predetermine speed or reduce the material realizes the control to the injection speed of material, has solved the problem that present artifical subjective judgement injection speed reliability is poor.

Further, for convenience of operation, the weight information processing unit is in signal connection with the injection speed control device to automatically control the injection speed of the discharge port according to the information of the weight information processing unit, and the injection speed control device is automatically controlled by the weight information processing unit to automatically adjust the injection speed of the material.

Further, in order to reduce the difficulty of control, the injection speed control device comprises an air inlet which is arranged on the mixing container and used for communicating an air source with an inner cavity of the mixing container, and an air outlet which is used for communicating the outer part of the mixing container with the inner cavity of the mixing container, the injection speed control device further comprises an air inlet valve which is used for closing the air inlet when the injection speed of the material is too large so as to reduce the injection speed, and an air outlet valve which is used for closing the air outlet when the injection speed of the material is too small so as to increase the injection speed, and the air inlet and the air outlet are arranged to discharge the air in the mixing container when the injection speed is too fast and inflate the mixing container when the injection speed is too slow so as to adjust the injection speed of.

Furthermore, in order to simplify the structure, the weighing device is an electronic scale which is arranged below the mixing container and is used for measuring the weight of the materials in the mixing container and the mixing container at the same time, the materials and the mixing container are weighed simultaneously through the electronic scale arranged on the outer side of the mixing container, and the weighing device is simple in structure and convenient to assemble.

Furthermore, in order to facilitate the movement of the mixing container, the mixing container is provided with a support for supporting the mixing container and walking wheels arranged at the support legs of the support, and the walking wheels are arranged below the mixing container, so that the mixing container can be moved conveniently.

Furthermore, in order to facilitate observation of operators, the weight information processing unit comprises a display device for displaying injection speed information, and the injection speed is displayed in real time through the display device, so that the operators can conveniently know process information at any time.

The technical scheme of the injection speed control method of the invention is as follows:

the injection speed control method of the present invention comprises the steps of: (1) continuously weighing the weight of the materials in the mixing container, and calculating the injection speed of the materials according to the weight variation of the materials; (2) and comparing the measured and calculated injection speed with a preset injection speed, if the measured and calculated injection speed is greater than the preset injection speed, reducing the injection speed through an injection speed control device, and otherwise, if the measured and calculated injection speed is less than the preset injection speed, increasing the injection speed through the injection speed control device.

The invention has the beneficial effects that: through weighing the material in the compounding container, obtain the weight variation of the material in the compounding container in the unit interval, then calculate the injection speed of material through the weight variation, and then the injection speed that the difference that corresponds according to the injection speed that actually records and predetermine speed or reduce the material realizes the control to the injection speed of material, has solved the problem that present artifical subjective judgement injection speed reliability is poor.

Further, for convenience of operation, the injection speed control device is automatically controlled, and the injection speed of the material is automatically adjusted by automatically controlling the injection speed control device.

Further, for the convenience of weighing, when weighing the interior material weight of compounding container, the compounding container of weighing simultaneously obtains the variable quantity of material weight through the variable quantity of calculation material and compounding container total weight, through weighing material and compounding container simultaneously, reduces the degree of difficulty of weighing.

Drawings

Fig. 1 is an isometric view of a blanking portion of an injection molding machine of embodiment 1 of the present invention;

fig. 2 is a front view of a blanking portion of an injection molding machine according to embodiment 1 of the present invention;

fig. 3 is a control schematic diagram of an injection molding machine according to embodiment 1 of the present invention;

in the figure: 1. an electronic scale; 2. a weight information processing unit; 3. a mixing container; 4. a material injection pipeline; 5. a valve actuating unit; 6. an air intake passage; 7. an exhaust passage; 8. an intake valve; 9. an exhaust valve; 10. a support; 11. and (5) traveling wheels.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 3, in the embodiment of the injection molding machine 1 of the present invention, the embodiment of the present invention will be further described by taking the injection molding machine of the present invention as an example of applying the injection molding machine to an embedded pole operation, but the application range of the injection molding machine of the present invention is not limited, and the injection molding machine can be used in an injection molding process of plastics, resins, etc., and the injection molding machine can be used in an embedded pole operation as well as in insulation casting of other parts requiring epoxy resin casting, such as electrical components such as bus bars, sleeves, etc. Injection molding machine includes a compounding container 3, is equipped with the compounding chamber that is used for mixing epoxy and curing agent in the compounding container 3, and 3 bottoms of compounding container are equipped with the notes material pipe 4 with compounding chamber intercommunication, and the end of annotating material pipe 4 is equipped with the discharge gate, and epoxy and curing agent in the compounding intracavity are in getting into the mould from the discharge gate after mixing, accomplish the pouring to the mould. The epoxy resin and the curing agent constitute materials, and in other embodiments, the types of the materials are not limited, and may be rubber, common resin, plastic, and the like, and the mixing container 3 may have only a function of storing the materials, but not a function of mixing, for some materials that do not need to be mixed.

Because the consistency of the injection speed of the epoxy resin is closely related to the appearance and the quality of a product, the product quality is improved in order to facilitate the control of the injection speed of the material, and the injection speed of the material required by molds with different structures is variable, in the embodiment, in order to facilitate the control of the injection speed of the mixed epoxy resin and curing agent, the top of the mixing container 3 is also provided with an air inlet channel 6 and an air outlet channel 7, an air inlet at one end of the air inlet channel 6 is communicated with an air compressor, the other end of the air inlet channel is communicated with a mixing cavity, an air outlet at one end of the air outlet channel 7 is communicated with the atmosphere, the air inlet channel 6 and the air outlet channel 7 are respectively provided with an air inlet valve 8 for controlling the on-off of the air inlet channel 6 and an air outlet valve 9 for controlling the on-off of the air outlet channel 7, and closing the air inlet valve 8 and opening the exhaust valve 9 to exhaust the gas in the mixing cavity so as to reduce the pressure on the materials in the mixing cavity and further reduce the injection speed, and when the injection speed of the materials is low, opening the air inlet valve 8 and opening the exhaust valve 9 to fill the gas into the mixing cavity so as to increase the pressure on the materials in the mixing cavity and further increase the injection speed. Wherein, the air compressor constitutes the air supply, and the air inlet passage 6, the exhaust passage 7, the air inlet valve 8 and the exhaust valve 9 constitute the injection speed control device for controlling the injection speed of the discharge port. Of course, in other embodiments, the air source may also be other air sources such as an air storage tank arranged in the plant; the mixing container 3 can also be only provided with the air inlet channel 6 but not the air outlet channel 7, the air inlet channel 6 is provided with a throttle valve, the flow of the gas filled in the mixing cavity is controlled by adjusting the opening of the throttle valve, when the material injection speed is low, the opening of the throttle valve is increased to increase the pressure on the material in the mixing cavity and further increase the injection speed, otherwise, when the material injection speed is high, the opening of the throttle valve is reduced to reduce the pressure on the material in the mixing cavity and further reduce the injection speed; the exhaust channel 7 can be not provided with the exhaust valve 9, the air inflow in the mixing cavity is changed by controlling the on-off of the air inlet valve 8 to control the injection speed, similarly, the air inlet valve 8 can be not arranged on the air inlet channel 6 to keep the air inlet channel 6 normally open, and the exhaust volume in the mixing cavity is changed by controlling the on-off of the exhaust valve 9 to control the injection speed.

In order to facilitate automatic control of the injection speed, in this embodiment, the injection molding machine further includes an electronic scale 1 disposed below the mixing container 3 and a weight information processing unit 2 in signal connection with the electronic scale 1, in the process of discharging the material in the mixing cavity, the electronic scale 1 weighs the material in the mixing container 3 and the mixing cavity, measures the weight variation of the material in unit time, inputs the weight variation of the material into the weight information processing unit 2, calculates the injection speed of the material, the weight information processing unit 2 is provided with an input port for inputting a preset speed and a display for displaying the injection speed information of the material, determines different preset speeds according to different process requirements, inputs the preset speeds into the weight information processing unit 2, the weight information processing unit 2 compares the measured actual injection speed with the preset speeds, the weight information processing unit 2 is further in signal connection with a valve action unit 5, if the actual injection speed exceeds the preset speed, the weight information processing unit 2 inputs a signal to the valve action unit 5, the valve action unit 5 drives the air inlet valve 8 to close and drives the exhaust valve 9 to open, otherwise, if the actual injection speed is less than the preset speed, the valve action unit 5 drives the air inlet valve 8 to open and drives the exhaust valve 9 to close, and therefore automatic control of the injection speed is achieved. Considering the influence of the conventional flow rate measuring device on the injection pressure of the epoxy resin, the electronic scale 1 placed at the lower end of the mixing container 3 at the time of mold pouring in the present embodiment approximately considers the weight reduction of the epoxy resin in the mixing chamber in a unit time as the injection speed of the epoxy resin, avoiding the loss of the injection pressure of the epoxy resin, wherein the electronic scale 1 constitutes a weighing unit. Of course, in other embodiments, the amount of weight change of the mixing container 3 may also be measured by using a hoist.

In the process of injection, the viscosity of the mixture is inconsistent and the injection pressure is inconsistent in consideration of factors such as material temperature, mixture ratio and performance difference of raw materials, and the injection molding machine calculates the final injection speed, so that the materials can be used under the conditions of temperature, mixture ratio, performance difference and the like.

When the injection molding machine of the present invention is used, for example, an injection molding is performed on a certain sealed pole, first, the injection speed in the weight information processing unit 2 is set to 2kg/min, and the injection time is set to 10 min. Opening the electronic scale 1, connecting the air inlet valve 8 with compressed air, clicking a start button of the injection molding machine to start injection at a certain moment, such as 8:00 a.m., recording the start time by the weight information processing unit 2, gradually reducing the weight displayed by the electronic scale 1 when the material flows out of the mixing cavity, immediately transmitting the displayed weight to the weight information processing unit 2, and calculating the material injection speed by the weight information processing unit 2 according to the weight variation in unit time. If the weight is reduced by 1.6kg by the electronic scale 1 at the time of 8:01, the weight information processing unit 2 calculates that the injection speed for the 1 minute is 1.6kg/min, and judges that the injection speed obtained this time is less than the set value of 2kg/min assuming that the injection speed set in this process is 2 kg/min. The information is further transmitted to the valve action unit 5, the valve action unit 5 sends a signal to instruct the air inlet valve 8 to be opened and the air outlet valve 9 to be closed, and the injection pressure in the mixing container 3 is increased after the instruction of the valve is carried out, so that the injection speed of the material is correspondingly increased; if the weight of the electronic scale 1 is reduced by 3.9kg at the time of 8:02, namely the weight of the electronic scale 1 is reduced by 2.3kg at the time of 2 minutes, the injection speed of the electronic scale 1 at the time of 2 minutes is calculated to be 2.3kg/min, the injection speed is judged to be greater than the set value of 2kg/min, the information is transmitted to the valve action unit 5, and the valve action unit 5 sends a signal to instruct the exhaust valve 9 to be opened and the intake valve 8 to be closed. After the instruction valve acts, the injection pressure in the mixing container 3 is reduced, and the corresponding injection speed is reduced, so that the automatic adjustment of the injection speed is realized. The whole process does not need to be operated by personnel, the parameter setting is finished, the injection speed is fully automatically adjusted after the injection is clicked, the production automation level is effectively improved, the product quality is improved, the labor intensity is reduced, and the labor cost is reduced.

In this embodiment, in order to facilitate the maintenance and operation of the injection molding machine, the mixing container 3 is further provided with a support 10 for supporting the mixing container 3 and a traveling wheel 11 disposed at the support leg of the support 10, so that the mixing container 3 is convenient to move, and the labor intensity is reduced.

Embodiment 2 of the injection molding machine of the present invention is different from embodiment 1 of the injection molding machine of the present invention only in that: the exhaust valve is not arranged, the throttle valve is arranged on the air inlet channel, when the injection speed is lower than the preset speed, the opening of the throttle valve is increased through the controller, and when the injection speed is higher than the preset speed, the opening of the throttle valve is reduced through the controller.

Embodiment 3 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: the electronic scale sets up on the bottom chamber wall in the compounding container, and sliding seal between the outer border of electronic scale and compounding container inner chamber wall measures the weight variation volume of material and then obtains the injection speed of material through only weighing the material.

Embodiment 4 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: the mixing container is fixed on a weighing panel of the electronic scale.

Embodiment 5 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: and weighing the mixing container in a mode of hanging the mixing container.

Embodiment 6 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: the intake and exhaust valves are manually controlled.

Embodiment 7 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: and a throttle valve is arranged on the material injection pipeline, and the injection speed of the material is adjusted by adjusting the opening of the throttle valve.

Embodiment 8 of the injection molding machine of the present invention differs from embodiment 1 of the injection molding machine of the present invention only in that: for convenience of control, a two-position three-way electromagnetic directional valve can be arranged instead of an air inlet valve and an exhaust valve, wherein two valve ports are respectively communicated with an air inlet pipeline and an exhaust pipeline, one valve port is communicated with the interior of the mixing container, and a control signal is input into the two-position three-way electromagnetic directional valve to control the directional valve to switch between a communication position of an air inlet channel and the mixing container and a communication position of an exhaust channel and the mixing container, so that the on-off of the air inlet channel and the exhaust channel is realized to control the blanking speed.

A specific embodiment 1 of the injection speed control method of the present invention includes the steps of: (1) continuously weighing the weight of the material in the mixing container 3, and calculating the injection speed of the material according to the weight variation of the material; (2) and comparing the measured and calculated injection speed with a preset injection speed, if the measured and calculated injection speed is greater than the preset injection speed, reducing the injection speed through an injection speed control device, otherwise, if the measured and calculated injection speed is less than the preset injection speed, increasing the injection speed through the injection speed control device. In this embodiment, the injection speed control device may be automatically controlled or manually controlled, and weigh the material and the mixing container 3 at the same time when weighing the weight of the material, so as to obtain the amount of change in the weight of the material and reduce the difficulty of weighing, and the injection speed control device may be a throttle valve provided on the material injection pipe 4, and adjust the injection speed by adjusting the opening of the throttle valve, or may be the injection speed control device in embodiment 1 of the injection molding machine of the present invention. The structure of the injection molding machine in this embodiment may employ the injection molding machine as described in any one of embodiments 1 to 8 of the injection molding machine of the present invention.