Centralized mold temperature control system

Abstract

The embodiment of the utility model provides a centralized mold temperature control system. The centralized mold temperature control system comprises a mold cooling unit, a point cooling unit, a cooling medium circulating unit and a centralized control unit, the mold cooling unit comprises a mold temperature controller and a mold cooling pipeline; the point cooling unit comprises a point cooling machine and a point cooling pipeline; the cooling medium circulating unit comprises a cooling water tank, a water pump and a cooling tower; the centralized control unit comprises a PLC, a temperature sensor and an actuator, wherein the temperature sensor and the actuator are electrically connected with the PLC. The PLC can adjust the working states of the mold temperature controller and the point cooling machine according to temperature signals fed back by the temperature sensor and control the on-off states of the mold cooling pipeline and the point cooling pipeline through the actuator. And the mold cooling unit and the spot cooling unit work cooperatively, overall and local temperature control of the mold can be achieved at the same time, and the accuracy and efficiency of mold temperature control are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould temperature control technical field, concretely relates to a centralized mould temperature control system. BACKGROUND

[0002] In injection molding, die casting and other manufacturing processes, the control of mold temperature has an important influence on product quality and production efficiency. The traditional mold temperature control method usually adopts a decentralized cooling system, which has problems such as inaccurate temperature control, high energy consumption and complex maintenance. Especially in high-precision and high-demand manufacturing processes, fluctuations in mold temperature can cause products to shrink, deform, and have poor surface finish.

[0003] In order to solve the above problems, some centralized mold temperature control systems have been proposed in the prior art, but these systems usually only control single cooling or point cooling, and cannot meet the temperature control requirements of the whole mold and the local mold at the same time. Therefore, it is necessary to develop a centralized mold temperature control system that can simultaneously realize point cooling and mold cooling to improve the accuracy and efficiency of mold temperature control. SUMMARY

[0004] The embodiments of the utility model provide a centralized mold temperature control system, which includes a mold cooling unit and a point cooling unit, can meet the temperature control requirements of the whole mold and the local mold at the same time, and improve the accuracy and efficiency of mold temperature control.

[0005] The embodiments of the utility model provide a centralized mold temperature control system, which includes:

[0006] The mold cooling unit is used for controlling the overall temperature of the mold, and includes a mold temperature machine and a mold cooling pipeline;

[0007] The point cooling unit is used for controlling the local temperature of the mold, and includes a point cooling machine and a point cooling pipeline;

[0008] The cooling medium circulating unit is used for providing cooling medium for the mold cooling unit and the point cooling unit, and includes a cooling water tank, a water pump and a cooling tower;

[0009] The centralized control unit is used for controlling the work of the mold cooling unit and the point cooling unit, and includes a PLC controller, a temperature sensor and an actuator electrically connected with the PLC controller;

[0010] The mold is provided with a main cooling channel and a point cooling nozzle, the mold temperature machine is connected to the inlet end of the main cooling channel through the mold cooling pipeline, the point cooling machine is connected to the inlet end of the point cooling nozzle through the point cooling pipeline, the outlet ends of the main cooling channel and the point cooling nozzle are respectively connected to the inlet end of the cooling tower through the backwater pipeline, the outlet end of the cooling tower is connected to the inlet end of the cooling water tank, and the outlet end of the cooling water tank is connected to the mold temperature machine and the point cooling machine through the water pump.

[0011] The temperature sensor is used to monitor the temperature of the mold in real time, the PLC controller adjusts the working state of the mold temperature machine and the point cooling machine according to the temperature signal fed back by the temperature sensor, and controls the on-off state of the mold cooling pipeline and the point cooling pipeline through the actuator.

[0012] Optionally, the mold comprises a fixed mold and a movable mold, and a plurality of groups of the main cooling channels and the point cooling nozzles are arranged on the fixed mold and the movable mold in a partitioned manner.

[0013] The mold cooling pipeline is provided with a fixed mold mold cooling distribution box and a movable mold mold cooling distribution box, the fixed mold mold cooling distribution box is connected to the corresponding main cooling channels on the fixed mold through a plurality of branches, and the movable mold mold cooling distribution box is connected to the corresponding main cooling channels on the movable mold through a plurality of branches.

[0014] The point cooling pipeline is provided with a fixed mold point cooling distribution box and a movable mold point cooling distribution box, the fixed mold point cooling distribution box is connected to the corresponding point cooling nozzles on the fixed mold through a plurality of branches, and the movable mold point cooling distribution box is connected to the corresponding point cooling nozzles on the movable mold through a plurality of branches.

[0015] Optionally, a fixed mold transition plate is arranged beside the fixed mold, a plurality of channels for communicating with the main cooling channels and the point cooling nozzles on the fixed mold are arranged in the fixed mold transition plate, and the fixed mold mold cooling distribution box and the fixed mold point cooling distribution box are connected to the fixed mold transition plate.

[0016] Optionally, a movable mold transition plate is arranged beside the movable mold, a plurality of channels for communicating with the main cooling channels and the point cooling nozzles on the movable mold are arranged in the movable mold transition plate, and the movable mold mold cooling distribution box and the movable mold point cooling distribution box are connected to the movable mold transition plate.

[0017] Optionally, the mold temperature machine, the point cooling machine, the PLC controller and the cooling medium circulating unit are centrally arranged in a mold cooling station host.

[0018] Optionally, the mold cooling station host is further provided with a man-machine interface for setting and monitoring system operating parameters.

[0019] Optionally, the PLC controller controls the temperature of the mold through a PID controller.

[0020] The embodiment of the utility model has the following beneficial effects: the PLC controller is used for controlling the mold cooling unit and the point cooling unit to work cooperatively, the temperature control of the whole mold and the local mold can be realized simultaneously, and the accuracy and efficiency of the mold temperature control are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0022] Figure 1 It is the structural schematic diagram of the embodiment of the utility model;

[0023] Figure 2 It is the working principle diagram of the embodiment of the utility model;

[0024] Figure 3 It is the PID flow chart of the embodiment of the utility model;

[0025] The figure number indicates:

[0026] 1, cooling water tank;2, water pump;3, cooling tower;4, mold cooling station host computer;5, fixed mold;6, movable mold;7, fixed mold mold cooling distribution box;8, movable mold mold cooling distribution box;9, fixed mold point cooling distribution box;10, movable mold point cooling distribution box;11, fixed mold transition plate;12, movable mold transition plate. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] The embodiment of the utility model provides a kind of centralized mold temperature control system, it mainly includes:

[0029] Mold cooling unit: for controlling the overall temperature of the mold, including mold temperature machine and mold cooling pipeline, mold temperature machine is communicated to the inlet end of mold main cooling passage by mold cooling pipeline.

[0030] Point cooling unit: used for controlling the local temperature of the mold, including a point cooling machine and a point cooling pipeline, the point cooling machine is connected to the inlet end of the mold point cooling nozzle through the point cooling pipeline, the point cooling nozzle is arranged at the local key position of the mold, and is used for rapidly cooling the local mold.

[0031] Cooling medium circulating unit: used for providing cooling medium for the mold cooling unit and the point cooling unit, including a cooling water tank 1, a water pump 2 and a cooling tower 3. As shown in Figure 2 、 Figure 3 , the outlet end of the mold main cooling channel and the point cooling nozzle are respectively communicated with the inlet end of the cooling tower 3 through the backwater pipeline, the outlet end of the cooling tower 3 is communicated with the inlet end of the cooling water tank 1, and the outlet end of the cooling water tank 1 is communicated with the mold temperature machine and the point cooling machine through the water pump 2.

[0032] The cooling medium in the cooling water tank 1 is pumped to the mold temperature machine and the point cooling machine through the water pump 2, and the cooling medium is delivered to the mold by the mold temperature machine and the point cooling machine to cool the mold as a whole and locally; the cooling medium flowing out of the mold is returned to the cooling tower 3 through the backwater pipeline for heat exchange and cooling, and after cooling, it is returned to the cooling water tank 1 for circulation to ensure the temperature stability of the cooling medium.

[0033] Centralized control unit: used for controlling the work of the mold cooling unit and the point cooling unit, including a PLC controller and temperature sensors and actuators electrically connected with the PLC controller. The temperature sensor is used for real-time monitoring of the temperature of the mold, and the PLC controller can adjust the working state of the mold temperature machine and the point cooling machine according to the temperature signal fed back by the temperature sensor, and control the on-off state of the mold cooling pipeline and the point cooling pipeline through the actuators (such as pumps, valves and other components on the pipeline).

[0034] For the convenience of centralized control, the mold temperature machine, the point cooling machine, the PLC controller and the cooling medium circulating unit can be centrally arranged on the mold cooling station host 4. At the same time, a man-machine interface can also be arranged on the mold cooling station host 4, and the operating parameters of the system are set and monitored through the man-machine interface. The man-machine interface includes a touch screen, operation buttons and an alarm device. The operator can set the target temperature of the mold through the touch screen, and the system running state and alarm information will also be displayed on the touch screen.

[0035] Specifically, as shown in Figure 1 、 Figure 2 , the mold includes a fixed mold 5 and a movable mold 6, and in order to further improve the accuracy and efficiency of the mold temperature control, a plurality of groups of main cooling channels and point cooling nozzles are arranged on the fixed mold 5 and the movable mold 6.

[0036] The fixed mold mold cooling distribution box 7 and the movable mold mold cooling distribution box 8 are arranged on the mold cooling pipeline, wherein the fixed mold mold cooling distribution box 7 is connected to the corresponding main cooling channels on the fixed mold 5 through multiple groups of branches, and the movable mold mold cooling distribution box 8 is connected to the corresponding main cooling channels on the movable mold 6 through multiple groups of branches. The fixed mold mold cooling distribution box 7 and the movable mold mold cooling distribution box 8 can uniformly distribute the cooling medium into different main cooling channels of the mold, ensure that the cooling effects of each part of the mold are consistent, and thus improve the product quality.

[0037] The fixed mold point cooling distribution box 9 and the movable mold point cooling distribution box 10 are arranged on the point cooling pipeline, wherein the fixed mold point cooling distribution box 9 is connected to the corresponding point cooling nozzles on the fixed mold 5 through multiple groups of branches, and the movable mold point cooling distribution box 10 is connected to the corresponding point cooling nozzles on the movable mold 6 through multiple groups of branches. The fixed mold point cooling distribution box 9 and the movable mold point cooling distribution box 10 can distribute more accurate cooling medium for each point cooling nozzle to meet the cooling needs of different parts of the mold.

[0038] In order to facilitate the connection of the pipeline, the fixed mold transition plate 11 and the movable mold transition plate 12 can be arranged on the sides of the fixed mold 5 and the movable mold 6 respectively, and multiple channels are designed in the fixed mold transition plate 11 and the movable mold transition plate 12. The channels in the fixed mold transition plate 11 are connected to the main cooling channels and the point cooling nozzles on the fixed mold 5 respectively, and the fixed mold mold cooling distribution box 7 and the fixed mold point cooling distribution box 9 are connected to the fixed mold transition plate 11. The channels in the movable mold transition plate 12 are connected to the main cooling channels and the point cooling nozzles on the movable mold 6 respectively, and the movable mold mold cooling distribution box 8 and the movable mold point cooling distribution box 10 are connected to the movable mold transition plate 12. The transition plate arranged between the distribution box and the mold can facilitate the connection of the pipeline to adapt to the cooling line layout inside the mold, and ensure that the cooling medium can flow in and out smoothly.

[0039] Specifically, the mold cooling unit can select a constant water mode or an intermittent mode, and dynamically adjust according to the mold thermal balance demand. Each group of mold cooling branches is equipped with a flow sensor and a PID regulating valve to realize partition flow closed-loop control (0.6-0.8 MPa). The return water temperature is monitored in real time, combined with mold thermal imaging data, to automatically optimize the cooling strategy. The mold cooling unit can realize mold thermal balance, solve product defects (produce cold isolation, insufficient pouring, cracks, porosity and unclear outline, etc.) caused by too high or too low mold temperature, and prolong the service life of the mold.

[0040] The point cooling unit can be linked with the signal of the die casting machine, and the water supply and gas blowing time (0.1-10s adjustable) of each point cooling branch can be controlled in time with “beginning of injection” as the trigger point. Each group of point cooling branches is provided with independent flow monitoring (±5% alarm) and supports automatic shutdown when exceeding the limit. The point cooling unit can pulse cool the mold core pin (≤Φ2mm thin hole) to solve product defects (shrinkage, sticking, tearing, etc.) caused by thermal junction, and prolong the service life of the core pin.

[0041] The centralized control unit can be controlled by Siemens S7-1200 PLC, and functions such as automatic water replenishment of the cooling water tank 1 (liquid level sensor cooperates with an electric valve), PID regulation of circulating cooling medium temperature (frequency converter drives a water pump 2), abnormal alarm (water shortage, overpressure, leakage and the like) and historical fault record are realized.

[0042] The man-machine interface can adopt a Siemens touch screen: graphical display of the flow, pressure and temperature curves of each branch, supporting Chinese-English switching. Storage and calling of mold parameters: one-key saving / loading of temperature control parameters (water passing time, branch selection and the like) corresponding to the mold code. Die casting machine linkage control: receiving die casting machine "mold in place" and "injection start" signals, synchronously starting the cooling program, realizing beat control; the fault signal (system fault, flow overrun) is fed back to the die casting machine HMI, triggering the shutdown protection. Remote monitoring and data analysis: reserving a Modbus TCP communication interface, supporting access to a factory MES system, uploading energy consumption and efficiency data in real time; based on historical data analysis of mold heat balance trends, the cooling parameter setting is optimized.

[0043] Figure 3 For the PID flowchart of the embodiment of the utility model, PID (proportional-integral-derivative) control is the core control algorithm of the mold temperature control system, which is used for adjusting cooling medium flow, temperature and the like, and ensuring that the mold temperature is stably set at a set value. The PID controller can realize accurate control by calculating the error (deviation of the set value and the actual value) in real time and dynamically adjusting the output signal (such as water pump speed, valve opening degree and the like).

[0044] The detailed process of the PID control of the embodiment of the utility model is as follows:

[0045] 1, set temperature (SP): the operator inputs the target temperature (such as 200 DEG C) of the mold through the touch screen, and the system takes the set value (SP) as the reference of the PID control.

[0046] 2, actual temperature (PV): the temperature sensor collects the actual temperature data of each partition of the mold in real time, and the PLC controller feeds back the temperature data to the PID controller after processing.

[0047] 3, error calculation (E = SP-PV): the PID controller calculates the deviation (E) of the set temperature and the actual temperature. For example: the set temperature is 200 DEG C, and the actual temperature is 190 DEG C, then E = +10 DEG C.

[0048] 4, proportional control (P = Kp*E): the proportional term (P) is adjusted according to the current value of the error. The proportional coefficient (Kp) determines the response speed, and the larger Kp is, the faster the response is, but it may cause oscillation. For example: Kp = 2, E = +10 DEG C, then P = 20.

[0049] 5、Integral control (I = Ki * integral Edt) : The integral term (I) accumulates historical errors to eliminate steady-state errors. The integral coefficient (Ki) determines the accumulation speed, and the larger Ki, the faster the error is eliminated, but it may cause overshoot. For example: Ki = 0.5, the error accumulation value is 30, then I = 15.

[0050] 6、Derivative control (D = Kd * dE / dt) : The derivative term (D) predicts error trends to suppress system oscillation. The derivative coefficient (Kd) determines the damping effect, and the larger Kd, the more stable the system, but it may reduce the response speed. For example: Kd = 1, the error rate is -2℃ / s, then D = -2.

[0051] 7、PID output (Output = P + I + D) : Add P, I and D to get the control output. For example: P = 20, I = 15, D = -2, then Output = 33.

[0052] 8、Actuator adjustment: Adjust the actuator (such as water pump speed, valve opening, etc.) according to the PID output value. For example: Output = 33, corresponding to the water pump speed to 70%.

[0053] 9、Mold temperature feedback: After the actuator action, the mold temperature changes, and the temperature sensor collects real-time new temperature data (PV) and feeds it back to the PID controller for the next round of adjustment cycle. Through PID control, the mold temperature control system can quickly and accurately adjust the mold temperature to ensure product quality and production efficiency, and combined with the actual hardware configuration (PLC, sensor, actuator, etc.), further improve the energy saving and stability of the system.

[0054] In this paper, specific examples are used to illustrate the principles and implementation methods of the present application. The above examples are only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can modify the technical solutions described in the above embodiments or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A centralized mold temperature control system, characterized by, The application relates to a mold cooling system, which comprises the following parts: a mold cooling unit for controlling the overall temperature of a mold, including a mold temperature machine and a mold cooling pipeline; a point cooling unit for controlling the local temperature of the mold, including a point cooling machine and a point cooling pipeline; a cooling medium circulating unit for providing cooling medium for the mold cooling unit and the point cooling unit, including a cooling water tank, a water pump and a cooling tower; a centralized control unit for controlling the operation of the mold cooling unit and the point cooling unit, including a PLC controller and temperature sensors and actuators electrically connected with the PLC controller; the mold is provided with a main cooling channel and a point cooling nozzle, the mold temperature machine is connected to the inlet end of the main cooling channel through the mold cooling pipeline, the point cooling machine is connected to the inlet end of the point cooling nozzle through the point cooling pipeline, the outlet ends of the main cooling channel and the point cooling nozzle are respectively connected to the inlet end of the cooling tower through a backwater pipeline, the outlet end of the cooling tower is connected to the inlet end of the cooling water tank, and the outlet end of the cooling water tank is connected to the mold temperature machine and the point cooling machine through the water pump; the temperature sensors are used for monitoring the temperature of the mold in real time, the PLC controller adjusts the working state of the mold temperature machine and the point cooling machine according to the temperature signal fed back by the temperature sensors, and the PLC controller controls the on-off state of the mold cooling pipeline and the point cooling pipeline through the actuators. The mold comprises a fixed mold and a movable mold, and a plurality of groups of the main cooling channels and the point cooling nozzles are arranged in zones on the fixed mold and the movable mold; The mold cooling pipeline is provided with a fixed mold mold cooling distribution box and a movable mold mold cooling distribution box, the fixed mold mold cooling distribution box is connected to corresponding main cooling channels on the fixed mold through a plurality of branches, and the movable mold mold cooling distribution box is connected to corresponding main cooling channels on the movable mold through a plurality of branches; The point cooling pipeline is provided with a fixed mold point cooling distribution box and a movable mold point cooling distribution box, the fixed mold point cooling distribution box is connected to corresponding point cooling nozzles on the fixed mold through a plurality of branches, and the movable mold point cooling distribution box is connected to corresponding point cooling nozzles on the movable mold through a plurality of branches. The fixed mold is provided with a fixed mold transition plate, a plurality of channels for being connected to the main cooling channels and the point cooling nozzles on the fixed mold are arranged in the fixed mold transition plate, and the fixed mold mold cooling distribution box and the fixed mold point cooling distribution box are connected to the fixed mold transition plate. The movable mold is provided with a movable mold transition plate, a plurality of channels for being connected to the main cooling channels and the point cooling nozzles on the movable mold are arranged in the movable mold transition plate, and the movable mold mold cooling distribution box and the movable mold point cooling distribution box are connected to the movable mold transition plate. The mold temperature machine, the point cooling machine, the PLC controller and the cooling medium circulating unit are centrally arranged in a mold cooling station host.

2. The centralized mold temperature control system of claim 1, wherein: The mold cooling station host is further provided with a man-machine interface for setting and monitoring system operation parameters. The PLC controller controls the temperature of the mold through a PID controller. ​ 3. The centralized mold temperature control system of claim 2, wherein: ​ 4. The centralized mold temperature control system of claim 2, wherein: ​ 5. The centralized mold temperature control system of claim 1, wherein: ​ 6. The centralized mold temperature control system of claim 5, wherein: ​ 7. The centralized mold temperature control system of any of claims 1-6, wherein: ​

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