CN108543927B - Constant-pressure control method of spot-cooling machine - Google Patents
Constant-pressure control method of spot-cooling machine Download PDFInfo
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- CN108543927B CN108543927B CN201810384640.5A CN201810384640A CN108543927B CN 108543927 B CN108543927 B CN 108543927B CN 201810384640 A CN201810384640 A CN 201810384640A CN 108543927 B CN108543927 B CN 108543927B
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- pressure
- way valve
- cooling machine
- command
- water pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2218—Cooling or heating equipment for dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
Abstract
The invention discloses a constant pressure control method of a point cooling machine, which comprises the steps of starting the point cooling machine, wherein a frequency converter on the point cooling machine acquires a first pressure value of a water pump on the point cooling machine and transmits the first pressure value to a PID (proportion integration differentiation) controller; the PID controller starts a pressure storage command and sends the pressure storage command to a one-way valve of the spot cooler; the one-way valve closes the pressure release valve and the exhaust valve on the one-way valve after receiving the pressure storage command, and the PID controller can be used for starting the water pump in advance and storing pressure for the one-way valve, so that the starting time of the point cooling machine can be saved, the constant pressure control of the one-way valve on the point cooling machine can be rapidly realized after the point cooling machine is started, the cooling rate of a point cooling pipe at the end of the one-way valve on a mold is improved, and the cooling effect is ensured.
Description
Technical Field
The invention relates to the technical field of die-casting cooling, in particular to a constant-pressure control method of a point cooling machine.
Background
In the production process of the die-casting die, the temperature of the die is a key factor influencing the good forming of a product, local high temperature or low temperature can seriously influence the forming of the product and the service life of the die, although the temperature of the die cannot be absolutely balanced in actual production, the temperature of each area of the die can be controlled by correctly designing the structure of the die and matching with a high-efficiency and reasonable cooling system. Because of the severe production environment and the particularity of metal die casting in the die casting production process, the die needs to repeatedly bear the temperature difference of quenching and sudden heating which is about 400 ℃ in a short time, great heat exchange variable stress can be generated, the die is easy to crack, and the die also needs to bear the scouring of high-speed aluminum liquid, so that the part of the surface of the die forming part is whitened due to overhigh temperature and higher temperature, and the part can be adhered with a die casting piece, so that the pressed part is deformed or even torn, and the die material is scrapped; meanwhile, metal die casting needs to be carried out in a metal liquid state, and the die can be opened only by cooling the metal liquid state in the die to a certain temperature below a metal solidus line, so that the cooling efficiency of the die directly influences the die casting production efficiency, and the constant-pressure control of the spot cooling machine directly influences the cooling efficiency of the die, and further influences the die casting production efficiency.
Disclosure of Invention
In order to solve the problems in the prior art, an embodiment of the present invention provides a constant-voltage control method for a spot cooler.
The technical scheme of the embodiment of the invention is as follows:
a constant-pressure control method of a spot cooler, the method comprising:
starting the point cooling machine, wherein a frequency converter on the point cooling machine acquires a first pressure value of a water pump on the point cooling machine and transmits the first pressure value to a PID controller;
the PID controller starts a pressure storage command and sends the pressure storage command to a one-way valve of the spot cooler;
and the check valve closes the pressure relief valve and the exhaust valve on the check valve after receiving the pressure storage command.
Particularly, can realize starting the water pump in advance and store up the pressure to the check valve through the PID controller among this technical scheme, so can save the start-up time of point cold machine, can realize the constant voltage control to the check valve on the point cold machine rapidly after the point cold machine starts, improve the point cold pipe at check valve terminal and to the cooling rate of mould, ensure cooling effect.
Further, after the check valve receives the pressure storage signal and closes the relief valve and the exhaust valve on the check valve, the method further comprises:
a pressure sensor on the spot cooling machine acquires a second pressure value on the one-way valve and transmits the second pressure value to the PID controller;
the PID controller judges whether the second pressure value is larger than a preset pressure value or not, if so, a pressure relief command is started and sent to a one-way valve of the point cooling machine, and the one-way valve opens a pressure relief valve and an exhaust valve on the one-way valve to relieve pressure after receiving the pressure relief command;
if not, the PID controller starts a pressurization command and transmits the pressurization command to the water pump through the frequency converter, and the water pump increases the operation power.
Specifically, can realize the real time monitoring to the pressure on the check valve through pressure sensor among this technical scheme, contrast it with the preset pressure value on the PID controller, later can realize the effective control to the water supply pressure on the check valve through relief valve, discharge valve and converter, and then improve the cooling rate of some cold tubes at check valve terminal to the mould, ensure the cooling effect.
Further, the starting of the spot cooler also comprises the following steps,
the PID controller triggers a pressure starting command according to preset pressure and transmits the pressure starting command to the water pump through the frequency converter;
and the water pump calculates the operation power of the water pump and starts the water pump to operate according to the pressure starting command.
Specifically, after the point cooling machine is started, the PID controller directly realizes the adjustment of the running power of the water pump through the frequency converter according to a preset pressure value, the quick and effective control of the water supply pressure of the one-way valve is realized, the starting time of the point cooling machine is saved, the cooling rate of a point cooling pipe at the terminal of the one-way valve to a mold is improved, and the cooling effect is ensured.
The constant-pressure control method of the point cooling machine provided by the embodiment of the invention comprises the steps of starting the point cooling machine, wherein a frequency converter on the point cooling machine acquires a first pressure value of a water pump on the point cooling machine and transmits the first pressure value to a PID (proportion integration differentiation) controller; the PID controller starts a pressure storage command and sends the pressure storage command to a one-way valve of the spot cooler; the one-way valve closes the pressure release valve and the exhaust valve on the one-way valve after receiving the pressure storage command, and the PID controller can be used for starting the water pump in advance and storing pressure for the one-way valve, so that the starting time of the point cooling machine can be saved, the constant pressure control of the one-way valve on the point cooling machine can be rapidly realized after the point cooling machine is started, the cooling rate of a point cooling pipe at the end of the one-way valve on a mold is improved, and the cooling effect is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a constant-pressure control method of a spot cooler according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a constant-pressure control method of a spot cooler according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A constant-pressure control method of a spot cooler, the method comprising, with reference to fig. 1:
s11, starting the point cooling machine, and enabling a frequency converter on the point cooling machine to obtain a first pressure value of a water pump on the point cooling machine and transmit the first pressure value to the PID controller;
s12, the PID controller starts a pressure storage command and sends the pressure storage command to a one-way valve of the spot cooler;
s13 closing a pressure relief valve and an exhaust valve on the one-way valve after the one-way valve receives the pressure storage command;
s14, a pressure sensor on the spot cooler acquires a second pressure value on the one-way valve and transmits the second pressure value to the PID controller;
s15 the PID controller judges whether the second pressure value is larger than a preset pressure value, if yes, the step S16 is executed, and if not, the step S18 is executed;
s16, the PID controller starts a pressure relief command and sends the pressure relief command to a one-way valve of the point cooling machine;
s17, after receiving the pressure relief command, the one-way valve opens a pressure relief valve and an exhaust valve on the one-way valve to relieve pressure;
s18, the PID controller starts a pressurization command and transmits the command to the water pump through the frequency converter.
And S19, increasing the running power of the water pump.
According to the constant pressure control method of the spot cooling machine, the water pump can be started in advance and the pressure of the one-way valve can be stored through the PID controller, so that the starting time of the spot cooling machine can be saved, and the constant pressure control of the one-way valve on the spot cooling machine can be quickly realized after the spot cooling machine is started; the real-time monitoring of the pressure on the one-way valve can be realized through the pressure sensor in the operation process of the spot cooling machine, the pressure is compared with the preset pressure value on the PID controller, then the effective control of the water supply pressure on the one-way valve can be realized through the pressure release valve, the exhaust valve and the frequency converter, the cooling rate of a spot cooling pipe at the terminal of the one-way valve on a mold is further improved, and the cooling effect is ensured.
Example 2
A constant-pressure control method of a spot cooler, the method comprising, with reference to fig. 2:
s21, triggering a pressure starting command by the PID controller according to a preset pressure value, and transmitting the pressure starting command to the water pump through the frequency converter;
and S22, calculating the water pump running power and starting the water pump to run according to the pressure starting command.
S23, a pressure sensor on the spot cooler acquires a second pressure value on the one-way valve and transmits the second pressure value to the PID controller;
s24 the PID controller judges whether the second pressure value is larger than the preset pressure value, if yes, the step S25 is started, if no, the step S27 is started.
S25, starting a pressure relief command and sending the pressure relief command to a one-way valve of the spot cooler;
s26, after receiving the pressure relief command, the one-way valve opens a pressure relief valve and an exhaust valve on the one-way valve to relieve pressure;
s27, the PID controller starts a pressurization command and transmits the pressurization command to the water pump through the frequency converter, and the water pump increases the operation power.
Specifically, after the point cooling machine is started in the embodiment, the PID controller directly adjusts the running power of the water pump through the frequency converter according to the preset pressure value, so that the water supply pressure of the one-way valve is quickly and effectively controlled, the starting time of the point cooling machine is saved, the cooling rate of a point cooling pipe at the terminal of the one-way valve on a mold is improved, and the cooling effect is ensured; in the operation process of the spot cooling machine, the pressure sensor can be used for monitoring the pressure on the one-way valve in real time, the pressure is compared with a preset pressure value on the PID controller, then the effective control of the water supply pressure on the one-way valve can be realized through the pressure release valve, the exhaust valve and the frequency converter, and then the cooling rate of a spot cooling pipe at the terminal of the one-way valve on a mold is improved, so that the cooling effect is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A constant-pressure control method of a spot cooler, characterized by comprising:
starting the point cooler, calculating the running power of the water pump by the water pump according to a pressure starting command, and starting the water pump to run;
a frequency converter on the spot cooling machine acquires a first pressure value of a water pump on the spot cooling machine and transmits the first pressure value to a PID controller;
the PID controller triggers a pressure starting command according to preset pressure and transmits the pressure starting command to the water pump through the frequency converter;
the PID controller starts a pressure storage command and sends the pressure storage command to a one-way valve of the spot cooler;
the one-way valve closes a pressure relief valve and an exhaust valve on the one-way valve after receiving the pressure storage command;
a pressure sensor on the spot cooling machine acquires a second pressure value on the one-way valve and transmits the second pressure value to the PID controller;
the PID controller judges whether the second pressure value is larger than a preset pressure value or not, if so, a pressure relief command is started and sent to a one-way valve of the point cooling machine, and the one-way valve opens a pressure relief valve and an exhaust valve on the one-way valve to relieve pressure after receiving the pressure relief command;
if not, the PID controller starts a pressurization command and transmits the pressurization command to the water pump through the frequency converter, and the water pump increases the operation power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810384640.5A CN108543927B (en) | 2018-04-24 | 2018-04-24 | Constant-pressure control method of spot-cooling machine |
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| CN201810384640.5A CN108543927B (en) | 2018-04-24 | 2018-04-24 | Constant-pressure control method of spot-cooling machine |
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| CN108543927A CN108543927A (en) | 2018-09-18 |
| CN108543927B true CN108543927B (en) | 2020-09-01 |
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Citations (6)
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| JP2001050188A (en) * | 1999-08-05 | 2001-02-23 | Hitachi Ltd | Pressure water supply device and its driving method |
| CN201202661Y (en) * | 2008-05-29 | 2009-03-04 | 林永德 | Constant pressure frequency conversion pump for water supply system |
| CN205062893U (en) * | 2015-10-20 | 2016-03-02 | 北京凌锐能源技术有限公司 | Circulating water system ordinary pressure exhaust level pressure moisturizing device |
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2018
- 2018-04-24 CN CN201810384640.5A patent/CN108543927B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| JPH07317697A (en) * | 1994-05-27 | 1995-12-05 | Kawamoto Seisakusho:Kk | Water feeding device |
| JP2001050188A (en) * | 1999-08-05 | 2001-02-23 | Hitachi Ltd | Pressure water supply device and its driving method |
| CN201202661Y (en) * | 2008-05-29 | 2009-03-04 | 林永德 | Constant pressure frequency conversion pump for water supply system |
| CN205062893U (en) * | 2015-10-20 | 2016-03-02 | 北京凌锐能源技术有限公司 | Circulating water system ordinary pressure exhaust level pressure moisturizing device |
| CN205530483U (en) * | 2016-04-26 | 2016-08-31 | 佳木斯大学 | Cold water constant -pressure variable -frequency control system |
| CN206233308U (en) * | 2016-10-19 | 2017-06-09 | 青岛静水机电设备股份有限公司 | Terminal pressure estimates formula non-negative pressure water-supply installation |
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