Cooling system of injection molding machine and cooling control method

Abstract

The invention discloses a cooling system of an injection molding machine and a cooling control method. The cooling system comprises a cooling pump, a servo motor, a servo driver, a cooler, a plurality of targets needing to be cooled and a liquid supply box used for providing a liquid cooling medium. According to the cooling system and the cooling control method, real-time starting and stopping of the cooling pump can be achieved through servo control according to monitoring and controlling of the real-time temperature of each target object needing to be cooled, excessive cooling can be effectively avoided, and therefore waste of energy consumption is avoided; besides, the rotating speed of the servo motor can be controlled through servo drive, so that the displacement of the cooling pump is controlled, real-time adjustment is carried out according to the cooling effect, intelligent speed adjustment is achieved, and each target object needing to be cooled is cooled more effectively.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent control of injection molding machines, and in particular to a cooling system and a cooling control method of an injection molding machine. Background Art

[0002] During the use of the injection molding machine, the temperature of the hydraulic oil, motor, drive, etc. will rise. The temperature rise will not only affect the quality of the product, but also affect the life of each component of the injection molding machine. Once a component is damaged, it is necessary to stop the machine for maintenance, which will affect production efficiency. Therefore, in order to maintain stable production, it is necessary to maintain the stability of the equipment temperature. Based on this, it is necessary to keep the temperature of the hydraulic oil, motor, drive, etc. stable. Injection molding machines using liquid-cooled motors and liquid-cooled drives need to use cooling motors to drive cooling pumps to control the temperature. The cooling motor uses an ordinary motor, and the start and stop of the ordinary motor follows the injection molding machine. When the injection molding machine is in production, the cooling pump continues to work. Although this method can reduce the temperature of the equipment to be cooled, it will cause energy waste due to continuous operation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a cooling system and a cooling control method for an injection molding machine, so that the injection molding machine can perform demand-based cooling according to the different temperatures of different parts to be cooled, thereby avoiding energy waste due to overcooling and achieving intelligent cooling effect.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: A cooling system for an injection molding machine comprises a cooling pump, a servo motor, a servo drive, a cooler, a plurality of target objects to be cooled and a liquid supply box for providing a liquid cooling medium, wherein the liquid supply box is connected to the liquid inlet of the cooling pump through the cooler, each of the target objects to be cooled has a cooling device, a cooling channel is arranged in the cooling device, the liquid inlet of each cooling channel is connected to the liquid outlet of the cooling pump through a liquid supply pipe that can be opened and closed independently, the liquid outlet of each cooling channel is connected to the liquid supply box, the opening and closing of the liquid supply pipe is controlled by a main control module of the injection molding machine, each of the target objects to be cooled is provided with a temperature sensor, the temperature sensor is connected to the main control module of the injection molding machine by an electrical signal to transmit the monitored real-time temperature data to the main control module of the injection molding machine, the cooling pump is driven by a servo motor, the servo drive is used to drive the servo motor, and the servo drive is controlled by the main control module of the injection molding machine.

[0005] Each of the liquid supply pipelines is provided with an electromagnetic switch valve, and the opening and closing of the electromagnetic switch valve is controlled by the main control module of the injection molding machine.

[0006] The cooling pump, the servo motor and the servo drive are integrally arranged to form an integrated servo cooling pump.

[0007] A cooling control method for an injection molding machine comprises the following steps: Preset the cooling start temperature and cooling stop temperature of each target object to be cooled on the main control module of the injection molding machine; Each temperature sensor monitors the real-time temperature of the corresponding target object to be cooled, and transmits the monitored real-time temperature data to the main control module; When the temperature of the target object to be cooled reaches the preset cooling start temperature, the following operations are performed: Start the cooling pump: the main control module controls the servo drive to work, the servo drive controls the servo motor to work, and then drives the cooling pump to start running; Open the liquid supply pipeline: the main control module controls the electromagnetic switch valve on the liquid supply pipeline corresponding to the required cooling target to open it so that the coolant can flow to the corresponding cooling device; Cooling: With the opening of the corresponding liquid supply pipeline, the relevant cooling device begins to cool the target object to be cooled; When the temperature of the object to be cooled drops to the preset cooling stop temperature or below, the following operations are performed: Close the liquid supply pipeline: The main control module controls the electromagnetic switch valve on the corresponding liquid supply pipeline of the target object to be cooled that has been cooled to close, cutting off the flow of coolant; Monitor all targets that need to be cooled: Continue to monitor the temperature of all targets that need to be cooled; Stop the cooling pump: When the temperature of all objects to be cooled reaches or is lower than the preset cooling stop temperature, the main control module will control the servo motor to stop working, thereby stopping the cooling pump.

[0008] A time interval value Δt and a target temperature change value ΔT are preset on the main control module of the injection molding machine. When the cooling pump is working, the temperature change of the target object to be cooled is monitored. If the temperature of the target object to be cooled does not reach the preset target temperature change value ΔT within the preset time interval Δt, the main control module controls the servo motor to proportionally increase the speed Q of the cooling pump and continue to monitor the temperature change of the target object to be cooled. If the temperature of the target object to be cooled still does not reach the target temperature change value ΔT within the next time interval Δt, the speed Q of the cooling pump continues to be proportionally increased until the requirements are met.

[0009] Compared with the prior art, the advantages of the present invention are: the cooling system and cooling control method can realize the real-time start and stop of the cooling pump through servo control according to the real-time temperature monitoring and supervision of each target object to be cooled, which can effectively avoid overcooling and thus avoid energy waste; in addition, the servo motor speed can be controlled by servo drive to control the displacement of the cooling pump, and real-time adjustments can be made according to the cooling effect to realize intelligent speed regulation, so as to more effectively cool each target object to be cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below with reference to the accompanying drawings.

[0012] As shown in the figure, a cooling system of an injection molding machine includes a cooling pump, a servo motor, a servo drive, a cooler, multiple targets to be cooled and a liquid supply tank for providing liquid cooling medium. The liquid supply tank is connected to the liquid inlet of the cooling pump through the cooler. Each target to be cooled has a cooling device. A cooling channel is arranged in the cooling device. The liquid inlet of each cooling channel is connected to the liquid outlet of the cooling pump through a liquid supply pipe that can be opened and closed independently. The liquid outlet of each cooling channel is connected to the liquid supply tank. The opening and closing of the liquid supply pipe is controlled by the main control module of the injection molding machine. A temperature sensor is arranged on each target to be cooled. The temperature sensor is connected to the main control module of the injection molding machine by electrical signals to transmit the monitored real-time temperature data to the main control module of the injection molding machine. The cooling pump is driven by a servo motor. The servo drive is used to drive the servo motor. The servo drive is controlled by the main control module of the injection molding machine.

[0013] In this specific embodiment, in order to enable each target object to be cooled to be independently controlled for cooling, an electromagnetic switch valve K is provided on each liquid supply pipeline, and the opening and closing of the electromagnetic switch valve K is controlled by the main control module of the injection molding machine. When cooling operation is not required, these electromagnetic switch valves K are all in a closed state. When the corresponding target object to be cooled needs to be cooled, the electromagnetic switch valve K on the liquid supply pipeline corresponding to the target object to be cooled is opened by the main control module to form a cooling liquid passage.

[0014] In this specific embodiment, the cooling pump, the servo motor and the servo drive are integrated to form an integrated servo cooling pump. The volume is small, so the space occupied by these components can be reduced, making it easier to arrange.

[0015] In this specific embodiment, the target objects to be cooled are the drive, motor and feed port of the injection molding machine.

[0016] A cooling control method for an injection molding machine comprises the following steps: Preset the cooling start temperature and cooling stop temperature of each target object to be cooled on the main control module of the injection molding machine; Each temperature sensor monitors the real-time temperature of the corresponding target object to be cooled, and transmits the monitored real-time temperature data to the main control module; When the temperature of the target object to be cooled reaches the preset cooling start temperature, the following operations are performed: Start the cooling pump: The main control module controls the servo motor to work, thereby driving the cooling pump to start running; Open the liquid supply pipeline: The main control module controls the electromagnetic switch valve K on the liquid supply pipeline corresponding to the target object to be cooled to open it so that the coolant can flow to the corresponding cooling device; Cooling: With the opening of the corresponding liquid supply pipeline, the relevant cooling device begins to cool the target object to be cooled; When the temperature of the object to be cooled drops to the preset cooling stop temperature or below, the following operations are performed: Close the liquid supply pipeline: The main control module controls the electromagnetic switch valve K on the corresponding liquid supply pipeline of the target object to be cooled that has been cooled to close, cutting off the flow of the coolant; Monitor all targets that need to be cooled: Continue to monitor the temperature of all targets that need to be cooled; Stop the cooling pump: When the temperature of all objects to be cooled reaches or is lower than the preset cooling stop temperature, the main control module will control the servo motor to stop working, thereby stopping the cooling pump.

[0017] In this specific embodiment, in order to improve the flexibility of overall cooling and improve the cooling efficiency, a time interval value Δt and a target temperature change value ΔT are preset on the main control module of the injection molding machine. When the cooling pump is working, the temperature change of the target object to be cooled is monitored. If the temperature of the target object to be cooled does not reach the preset target temperature change value ΔT within the preset time interval Δt, the main control module controls the servo motor to proportionally increase the speed Q of the cooling pump and continue to monitor the temperature change of the target object to be cooled. If the temperature of the target object to be cooled still does not reach the target temperature change value ΔT within the next time interval Δt, the speed Q of the cooling pump continues to be increased proportionally until the requirements are met.

Claims

1. A cooling system for an injection molding machine, characterized in that It includes a cooling pump, a servo motor, a servo drive, a cooler, a plurality of target objects to be cooled and a liquid supply box for providing liquid cooling medium. The liquid supply box is connected to the liquid inlet of the cooling pump through the cooler. Each of the target objects to be cooled has a cooling device. A cooling channel is arranged in the cooling device. The liquid inlet of each cooling channel is connected to the liquid outlet of the cooling pump through a liquid supply pipe that can be opened and closed independently. The liquid outlet of each cooling channel is connected to the liquid supply box. The opening and closing of the liquid supply pipe is controlled by the main control module of the injection molding machine. Each of the target objects to be cooled is provided with a temperature sensor. The temperature sensor is connected to the main control module of the injection molding machine by an electrical signal to transmit the monitored real-time temperature data to the main control module of the injection molding machine. The cooling pump is driven by a servo motor. The servo drive is used to drive the servo motor. The servo drive is controlled by the main control module of the injection molding machine.

2. A cooling system for an injection molding machine as claimed in claim 1, characterized in that Each of the liquid supply pipelines is provided with an electromagnetic switch valve, and the opening and closing of the electromagnetic switch valve is controlled by the main control module of the injection molding machine.

3. A cooling system for an injection molding machine as claimed in claim 1, characterized in that The cooling pump, the servo motor and the servo drive are integrally arranged to form an integrated servo cooling pump.

4. A cooling control method for a cooling system of an injection molding machine according to claim 1, 2 or 3, characterized in that The steps include: Preset the cooling start temperature and cooling stop temperature of each target object to be cooled on the main control module of the injection molding machine; Each temperature sensor monitors the real-time temperature of the corresponding target object to be cooled, and transmits the monitored real-time temperature data to the main control module; When the temperature of the target object to be cooled reaches the preset cooling start temperature, the following operations are performed: Start the cooling pump: The main control module controls the servo motor to work, thereby driving the cooling pump to start running; Open the liquid supply pipeline: the main control module controls the electromagnetic switch valve on the liquid supply pipeline corresponding to the required cooling target to open it so that the coolant can flow to the corresponding cooling device; Cooling: With the opening of the corresponding liquid supply pipeline, the relevant cooling device begins to cool the target object to be cooled; When the temperature of the object to be cooled drops to the preset cooling stop temperature or below, the following operations are performed: Close the liquid supply pipeline: The main control module controls the electromagnetic switch valve on the corresponding liquid supply pipeline of the target object to be cooled that has been cooled to close, cutting off the flow of coolant; Monitor all targets that need to be cooled: Continue to monitor the temperature of all targets that need to be cooled; Stop the cooling pump: When the temperature of all objects to be cooled reaches or is lower than the preset cooling stop temperature, the main control module will control the servo motor to stop working, thereby stopping the cooling pump.

5. A cooling control method for an injection molding machine as claimed in claim 4, characterized in that A time interval value Δt and a target temperature change value ΔT are preset on the main control module of the injection molding machine. When the cooling pump is working, the temperature change of the target object to be cooled is monitored. If the temperature of the target object to be cooled does not reach the preset target temperature change value ΔT within the preset time interval Δt, the main control module controls the servo motor to proportionally increase the speed Q of the cooling pump and continue to monitor the temperature change of the target object to be cooled. If the temperature of the target object to be cooled still does not reach the target temperature change value ΔT within the next time interval Δt, the speed Q of the cooling pump continues to be proportionally increased until the requirements are met.

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