Variable-frequency constant-pressure cooling device for die-casting die

Abstract

The variable-frequency constant-pressure cooling device comprises a stainless steel water tank, a water tank liquid level sensor is inserted in the stainless steel water tank, and a water supplementing electromagnetic valve is arranged on a water inlet pipe of the stainless steel water tank. A high-pressure water pump, a variable-frequency water pump system, a check valve, a die-casting die cooling water inlet flow sensor, a die-casting die cooling water inlet pressure sensor and a die-casting die cooling water inlet temperature sensor are sequentially arranged on a water outlet pipe of the stainless steel water tank, the water outlet pipe is finally communicated with the die, and cooling water enters the die to cool the fixed die and the movable die at the same time. A die-casting die cooling water outlet temperature sensor and a die-casting die cooling water outlet flow sensor are arranged on the water outlet pipe connected with the die, and finally cooling water flows to the cooling water tower. The cooling speed of the die-casting die is increased, stable quality of alloy products is guaranteed, the service life of the die-casting die is guaranteed, and safe production is guaranteed.

Description

Technical Field

[0001] The invention relates to a die-casting mold cooling device, and mainly relates to a variable frequency constant pressure cooling device for a die-casting mold. Background Art

[0002] The selected mold is installed between the moving and fixed mold plates of the die-casting machine according to the needs of the die-casting product. After the die-casting machine is locked, the molten alloy liquid conveying control system pours the molten alloy liquid in the furnace into the injection chamber (feeding barrel). Under the high pressure of the die-casting machine injection system, the molten alloy liquid is injected into the die-casting mold cavity and the high pressure is maintained until the liquid alloy is completely solidified into an alloy product, and then taken out.

[0003] During the production process of die-casting products, the die-casting mold easily absorbs the heat of the high-temperature molten alloy liquid, so the die-casting mold is in a very high temperature state. If the temperature of the die-casting mold is too high, it will inevitably affect the quality of the alloy product and the life of the die-casting mold. In order to ensure the stability of the quality of the alloy product and guarantee the life of the die-casting mold, the die-casting mold generally needs to use a cooling device to control the temperature to ensure that the die-casting mold is at the optimal temperature state. The existing die-casting mold connects the cooling water to the inside of the mold for heat exchange. Due to the insufficient output of the existing cooling water pump, the flow rate of the cooling water in the pipeline is slow, resulting in a slow cooling speed of the die-casting mold.

[0004] The existing cooling water system for controlling the temperature of the die-casting mold is not equipped with a monitoring and alarm device for the inlet and outlet water flow difference and the outlet water temperature, and is not interlocked with the molten alloy liquid delivery control system and the die-casting machine. If the molten alloy liquid comes into contact with water, a safety accident may easily occur. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and provide a variable frequency constant pressure cooling device for a die casting mold.

[0006] The purpose of the present invention is achieved through the following technical solutions: A variable frequency constant pressure cooling device for a die casting mold comprises a stainless steel water tank, a water tank level sensor is inserted in the stainless steel water tank, a water supply solenoid valve is arranged on the water inlet pipe of the stainless steel water tank, a high pressure water pump, a variable frequency water pump system, a check valve, a die casting mold cooling water inlet flow sensor, a die casting mold cooling water inlet pressure sensor, and a die casting mold cooling water inlet temperature sensor are arranged on the water outlet pipe of the stainless steel water tank in sequence, the water outlet pipe is finally connected with the mold, cooling water enters the mold, and the fixed mold and the movable mold are cooled at the same time, the water outlet pipe connected to the mold is provided with a die casting mold cooling water outlet temperature sensor and a die casting mold cooling water outlet flow sensor, and finally the cooling water flows to a cooling water tower; The cooling device also includes a PLC control system for real-time monitoring of a water tank level sensor, a die-casting mold cooling water inlet flow sensor, a die-casting mold cooling water inlet pressure sensor, a die-casting mold cooling water inlet temperature sensor, a die-casting mold cooling water outlet temperature sensor, and a die-casting mold cooling water outlet flow sensor.

[0007] A further improvement of the present invention is that: the water replenishment solenoid valve is used to control the stainless steel water tank to replenish cooling water; the water tank liquid level sensor is used to monitor the liquid level status of the stainless steel water tank in real time. When the water tank liquid level is low, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to be energized and start replenishing water; when the water tank liquid level is high, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to lose power and stop replenishing water; the variable frequency water pump system is used to control the constant pressure of the high-pressure water pump.

[0008] A further improvement of the present invention is that it also includes a high-pressure diaphragm tank for eliminating water hammer and pressure jitter, which is conducive to accurately monitoring the water outlet pressure of the high-pressure water pump.

[0009] A further improvement of the present invention is that: the water outlet pressure of the high-pressure water pump is set in the HMI control system according to the process of the die-casting product, the HMI control system transmits data to the PLC control system and the variable frequency water pump system, the high-pressure water pump receives the output command of the variable frequency water pump system, and the HMI control system sets the pressure alarm value of the die-casting mold cooling water inlet, the temperature alarm value of the die-casting mold cooling water outlet, and the die-casting mold cooling water inlet and outlet flow difference alarm value.

[0010] A further improvement of the present invention is that: the alarm logic for the difference in flow rate between the inlet and outlet water of the die-casting mold cooling is that when the value of the inlet flow rate minus the outlet flow rate is greater than a certain set value, a flow difference alarm is issued; the alarm logic for the outlet water temperature of the die-casting mold cooling is that when the outlet water temperature is greater than a certain set value, a high temperature alarm is issued.

[0011] A further improvement of the present invention is that the alarm system in the PLC control system is interlocked with the molten alloy liquid delivery control system and the die-casting machine.

[0012] Compared with the prior art, the present invention has the following advantages: The present invention improves the cooling speed of the die-casting die, ensures the stable quality of the alloy product, and guarantees the life of the die-casting die.

[0013] The present invention monitors the difference in inlet and outlet flow rates and outlet water temperature of the die-casting die cooling in real time, and interlocks the monitoring alarm with the molten alloy liquid conveying control system and the die-casting machine to ensure safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the present invention; Figure 2 This is an illustration of the alarm control for the difference in inlet and outlet water flow and outlet water temperature for die-casting mold cooling; Numbers in the figure: 1-stainless steel water tank, 2-water tank level sensor, 3-water supply solenoid valve, 4-frequency conversion water pump system, 5-check valve, 6-die-casting mold cooling water inlet flow sensor, 7-die-casting mold cooling water inlet pressure sensor, 8-die-casting mold cooling water inlet temperature sensor, 9-mold, 10-die-casting mold cooling water outlet temperature sensor, 11-die-casting mold cooling water outlet flow sensor, 12-cooling water tower, 13-high-pressure water pump. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The elements and features described in one embodiment of the present invention may be combined with the elements and features shown in one or more other embodiments. It should be noted that for the purpose of clarity, the representation and description of components and processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the description. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0016] The present invention is further described below in conjunction with the accompanying drawings: A variable frequency constant pressure cooling device for a die casting mold comprises a stainless steel water tank 1, a water tank level sensor 2 is inserted into the stainless steel water tank 1, a water supply solenoid valve 3 is arranged on the water inlet pipe of the stainless steel water tank 1, a high pressure water pump 13, a variable frequency water pump system 4, a check valve 5, a die casting mold cooling water inlet flow sensor 6, a die casting mold cooling water inlet pressure sensor 7, and a die casting mold cooling water inlet temperature sensor 8 are arranged on the water outlet pipe of the stainless steel water tank 1 in sequence, the water outlet pipe is finally connected with the mold 9, the cooling water enters the mold 9, and the fixed mold and the movable mold are cooled at the same time, the die casting mold cooling water outlet temperature sensor 10 and the die casting mold cooling water outlet flow sensor 11 are arranged on the water outlet pipe connected to the mold 9, and the cooling water finally flows to the cooling water tower 12; The cooling device also includes a PLC control system for real-time monitoring of a water tank level sensor 2, a die-casting mold cooling water inlet flow sensor 6, a die-casting mold cooling water inlet pressure sensor 7, a die-casting mold cooling water inlet temperature sensor 8, a die-casting mold cooling water outlet temperature sensor 10, and a die-casting mold cooling water outlet flow sensor 11; The cooling device also includes a high-pressure diaphragm tank for eliminating water hammer and pressure jitter, which is conducive to accurately monitoring the water outlet pressure of the high-pressure water pump.

[0017] The water replenishment solenoid valve 3 is used to control the stainless steel water tank 1 to replenish cooling water; the water tank liquid level sensor 2 is used to monitor the liquid level status of the stainless steel water tank 1 in real time. When the water tank liquid level is low, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to be energized and start replenishing water; when the water tank liquid level is high, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to lose power and stop replenishing water; the variable frequency water pump system 4 is used to control the constant pressure of the high-pressure water pump.

[0018] The outlet water pressure of the high-pressure water pump is set in the HMI control system according to the process of the die-casting product. The HMI control system transmits data to the PLC control system and the variable frequency water pump system 4. The high-pressure water pump receives the output command of the variable frequency water pump system 4. The HMI control system sets the pressure alarm value of the die-casting mold cooling water inlet, the temperature alarm value of the die-casting mold cooling water outlet, and the die-casting mold cooling water inlet and outlet flow difference alarm value.

[0019] The logic of the alarm for the difference in flow rate between the inlet and outlet of the die casting die cooling water is that the value of the inlet flow minus the outlet flow is greater than a certain set value, and the flow difference alarm is issued; the logic of the alarm for the outlet water temperature of the die casting die cooling water is that the outlet water temperature is greater than a certain set value, and the high temperature alarm is issued. The alarm system in the PLC control system is interlocked with the molten alloy liquid delivery control system and the die casting machine.

[0020] Through the monitoring controller, when the difference in the inlet and outlet flow rate of the cooling water of the die-casting mold reaches the alarm setting value or the outlet water temperature of the die-casting mold reaches the alarm setting value, it is determined that an alarm is required. The switch quantity of the alarm controller communicates with the molten alloy liquid delivery control system and the die-casting machine in the "1" state, so that the molten alloy liquid delivery control system and the die-casting machine simultaneously alarm and stop running.

[0021] Through the monitoring controller, it is determined that the difference in the inlet and outlet flow rates of the cooling water of the die-casting mold has not reached the alarm setting value and the outlet water temperature of the die-casting mold has not reached the alarm setting value, and no alarm is required. The switch quantity of the alarm controller is in the "0" state and does not communicate with the molten alloy liquid delivery control system and the die-casting machine, thereby achieving normal operation of the molten alloy liquid delivery control system and the die-casting machine.

[0022] Finally, it should be noted that although the present invention and its advantages have been described in detail above, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the present invention as defined by the appended claims. Moreover, the scope of the present invention is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. It will be readily understood by those skilled in the art from the disclosure of the present invention that existing and future processes, devices, means, methods or steps that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the corresponding embodiments described herein can be used according to the present invention. Therefore, the appended claims are intended to include such processes, devices, means, methods or steps within their scope.

Claims

1. A variable frequency constant pressure cooling device for a die casting mold, characterized in that: The invention comprises a stainless steel water tank (1), a water tank level sensor (2) is inserted into the stainless steel water tank (1), a water supply solenoid valve (3) is arranged on the water inlet pipe of the stainless steel water tank (1), a high-pressure water pump (13), a variable frequency water pump system (4), a check valve (5), a die-casting mold cooling water inlet flow sensor (6), a die-casting mold cooling water inlet pressure sensor (7), and a die-casting mold cooling water inlet temperature sensor (8) are arranged on the water outlet pipe of the stainless steel water tank (1), the water outlet pipe is finally connected to the mold (9), cooling water enters the mold (9), and the fixed mold and the movable mold are cooled at the same time, a die-casting mold cooling water outlet temperature sensor (10) and a die-casting mold cooling water outlet flow sensor (11) are arranged on the water outlet pipe connected to the mold (9), and the cooling water finally flows to the cooling water tower (12); The cooling device also includes a PLC control system for real-time monitoring of a water tank liquid level sensor (2), a die-casting mold cooling water inlet flow sensor (6), a die-casting mold cooling water inlet pressure sensor (7), a die-casting mold cooling water inlet temperature sensor (8), a die-casting mold cooling water outlet temperature sensor (10), and a die-casting mold cooling water outlet flow sensor (11).

2. According to claim 1, a variable frequency constant pressure cooling device for die casting molds, characterized in that: The water replenishment solenoid valve (3) is used to control the stainless steel water tank (1) to replenish cooling water; the water tank liquid level sensor (2) is used to monitor the liquid level status of the stainless steel water tank (1) in real time. When the water tank liquid level is low, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to be energized to start replenishing water; when the water tank liquid level is high, the PLC controls the solenoid valve for replenishing cooling water in the stainless steel water tank to be de-energized to stop replenishing water; the variable frequency water pump system (4) is used to control the high-pressure water pump to maintain a constant pressure.

3. According to claim 1, a variable frequency constant pressure cooling device for die casting molds, characterized in that: It also includes a high-pressure diaphragm tank, which is used to eliminate water hammer and pressure fluctuations, which is conducive to accurately monitoring the water outlet pressure of the high-pressure water pump.

4. According to claim 1, a variable frequency constant pressure cooling device for die casting molds, characterized in that: The outlet water pressure of the high-pressure water pump is set in the HMI control system according to the process of the die-casting product. The HMI control system transmits data to the PLC control system and the variable frequency water pump system (4). The high-pressure water pump receives the output command from the variable frequency water pump system (4). The HMI control system sets the pressure alarm value of the die-casting mold cooling water inlet, the temperature alarm value of the die-casting mold cooling water outlet, and the flow difference alarm value of the die-casting mold cooling water inlet and outlet.

5. According to claim 4, a variable frequency constant pressure cooling device for die casting molds, characterized in that: The alarm logic for the difference between the inlet and outlet water flow rates of die-casting mold cooling is that when the value of the inlet flow rate minus the outlet flow rate is greater than a certain set value, a flow difference alarm is issued; the alarm logic for the outlet water temperature of die-casting mold cooling is that when the outlet water temperature is greater than a certain set value, a high temperature alarm is issued.

6. The variable frequency constant pressure cooling device for die casting mold according to claim 1, characterized in that: The alarm system in the PLC control system is interlocked with the molten alloy liquid delivery control system and the die-casting machine.

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