CN111251566A - High-speed high-precision injection molding machine hydraulic control loop and method - Google Patents
High-speed high-precision injection molding machine hydraulic control loop and method Download PDFInfo
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- CN111251566A CN111251566A CN202010096512.8A CN202010096512A CN111251566A CN 111251566 A CN111251566 A CN 111251566A CN 202010096512 A CN202010096512 A CN 202010096512A CN 111251566 A CN111251566 A CN 111251566A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/82—Hydraulic or pneumatic circuits
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Abstract
The invention discloses a hydraulic control loop and a hydraulic control method for an injection molding machine with high-speed and high-precision injection, belongs to the technical field of injection molding machines, and solves the problems of poor injection precision and ejection and retraction precision, slow response and incapability of accurate positioning of the hydraulic control loop of the existing injection molding machine. This injection molding machine hydraulic control of high-speed high accuracy injection is convenient when including the injection molding machine injection, pressure oil passes through the interface and arrives the liquid filling control valve group, liquid filling control valve group control pressure oil fills the accumulator, pressure oil in the accumulator passes through the liquid discharge valve group and arrives first servo valve, pressure or the flow control pressure oil that first servo valve set for through the injection molding machine system enter into the injection chamber of injection molding machine, the second servo valve is opened, pressure oil in the injection chamber of injection molding machine passes through the second servo valve and gets into the oil tank, with the injection chamber, the pressure flow that penetrates the chamber is separately controllable, promote the brake response when high-speed injection, make the injection response faster, the location is more accurate.
Description
Technical Field
The invention relates to the technical field of injection molding machines, in particular to a hydraulic control loop and a hydraulic control method for an injection molding machine with high-speed and high-precision injection.
Background
Along with the increase of the demand of the injection molding machine for high-speed and high-precision injection, the conventional injection loop adopts an energy accumulator and a single plate servo valve to control the hydraulic loops of two cavities of an injection oil cylinder, and the control characteristics are as follows: the accumulator is the pressure source of injection and provides power for injection and ejection. The single servo valve synchronously controls the oil inlet and the oil return of the injection cylinder. The circuit can meet most production requirements. The method has the following defects: 1. the through flow of a single plate type servo valve is limited, the response of a smaller specification valve of a large specification plate type servo valve is obviously insufficient, the injection precision and the response requirement are high, or a large-flow injection process is required, and the defects of the control loop are obvious. 2. Such circuits have poor injection and retraction accuracy, since the servo valve only controls the injection accuracy.
Disclosure of Invention
The invention has been made in view of the above problems, and an object of the invention is to provide a hydraulic control circuit and method for an injection molding machine with high speed and high precision injection, which can meet the requirement of high precision injection, improve the brake response during injection, and make the injection molding response faster and the positioning more accurate.
In order to achieve the above object, the present invention provides a hydraulic control circuit for an injection molding machine with high-speed and high-precision injection, comprising: the injection molding machine comprises an energy accumulator, a liquid filling control valve group, a pressure relief valve group, a liquid discharging control valve group, a first servo valve for controlling an injection cavity of the injection molding machine and a second servo valve for controlling an injection cavity of the injection molding machine, wherein the liquid filling control valve group is connected with an oil inlet of the energy accumulator, an oil outlet of the energy accumulator is connected with the liquid discharging control valve group, the liquid discharging control valve group is connected with an oil inlet of a first servo valve, an oil outlet of the first servo valve is connected with an oil inlet of the injection cavity of the injection molding machine, an oil outlet of the injection cavity of the injection molding machine is connected with an oil inlet of the second servo valve, an oil return port of the second servo valve is connected with an oil return port of the first servo valve, and an oil return port of the first servo valve is connected with an oil;
the first servo valve controls the speed and the pressure of an injection cavity of the injection molding machine through the pressure or the flow set by the injection molding machine system.
According to the hydraulic control circuit of the injection molding machine with high speed and high precision, the liquid filling control valve group comprises the first cartridge valve and the first pilot valve, and the first pilot valve is used for controlling the opening and closing of the first cartridge valve.
According to the injection molding machine hydraulic control loop with high speed and high precision, the pressure relief valve group comprises a manual pressure relief valve, an automatic pressure relief valve and an energy accumulator safety valve, the automatic pressure relief valve is arranged between the first cartridge valve and the energy accumulator, and the manual pressure relief valve and the energy accumulator safety valve are both connected with the oil outlet of the energy accumulator.
According to the hydraulic control circuit of the injection molding machine with high speed and high precision, the oil inlet of the energy accumulator is connected with the first pressure monitor and the first pressure gauge, and the first pressure monitor is used for controlling the opening and closing of the safety valve of the energy accumulator.
According to the hydraulic control circuit of the injection molding machine with high speed and high precision injection, the liquid discharge control valve group comprises a second cartridge valve and a second pilot valve, an oil inlet of the second cartridge valve is connected with an oil outlet of the energy accumulator, an oil outlet of the second cartridge valve is connected with an oil inlet of the first servo valve, and the second pilot valve is used for controlling the opening and closing of the second cartridge valve.
According to the injection molding machine hydraulic control loop for high-speed and high-precision injection, the oil inlet of the injection cavity of the injection molding machine is connected with the second pressure monitor and the second pressure gauge, and the second pressure monitor controls the opening and closing of the first servo valve.
According to the injection molding machine hydraulic control loop for high-speed and high-precision injection, the injection molding machine hydraulic control loop further comprises an interface connected with the injection molding machine hydraulic pump, and the oil inlet of the second servo valve and the oil inlet of the first cartridge valve are both connected with the interface.
A hydraulic control method for an injection molding machine for high-speed and high-precision injection, the method comprising:
when the injection molding machine injects, pressure oil reaches the liquid filling control valve group through the interface, the liquid filling control valve group controls the pressure oil to fill liquid into the energy accumulator, the pressure oil in the energy accumulator reaches the first servo valve through the liquid discharging valve group, the first servo valve controls the pressure oil to enter an injection cavity of the injection molding machine through the pressure or flow control pressure oil set by the injection molding machine system, the second servo valve is opened, and the pressure oil in the injection cavity of the injection molding machine enters an oil tank through the second servo valve;
when the injection molding machine retreats, first servo valve and second servo valve open simultaneously, and pressure oil enters into through the second servo valve and penetrates and retreat the chamber to carry out the oil return through first servo valve.
The invention has the following beneficial effects:
1. the flow and pressure can be selected for controlling during injection, the speed and pressure of the injection cavity can be accurately controlled, the requirement of high-precision injection is met, and the double closed-loop control of pressure and flow is achieved.
2. The oil inlet and the oil return of the injection and retraction cavity are also controlled by a high-response servo valve, and the injection and retraction precision can be greatly improved
3. The pressure and flow of the injection cavity and the injection and withdrawal cavity are separately controlled, and the brake response during high-speed injection is improved, so that the injection response is faster, and the positioning is more accurate.
Drawings
FIG. 1 is a schematic diagram of the hydraulic circuit of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, a hydraulic control circuit for an injection molding machine capable of high-speed and high-precision injection is characterized by comprising: the injection molding machine comprises an energy accumulator 100, a liquid filling control valve group 200, a pressure relief valve group 300, a liquid discharge control valve group 400, a first servo valve 500 for controlling an injection cavity of the injection molding machine and a second servo valve 600 for controlling an injection and retraction cavity of the injection molding machine, wherein the pressure relief valve group 300 is used for relieving pressure of the energy accumulator in the working process and after stopping working and preventing dangerous events caused by overlarge pressure, the liquid filling control valve group 200 is connected with an oil inlet of the energy accumulator 100, an oil outlet of the energy accumulator 100 is connected with the liquid discharge control valve group 400, the liquid discharge control valve group 400 is connected with an oil inlet of the first servo valve 500, an oil outlet of the first servo valve 500 is connected with an oil inlet of the injection cavity of the injection molding machine, an oil outlet of the injection cavity of the injection molding machine is connected with an oil inlet of the second servo valve 600, an oil return port of the second servo valve 600 is connected with an oil return port of the first servo valve 500, an oil return port of the first, thereby make the accurate positioning under the high-speed operation of injection, can get into the injection intracavity through first servo valve 500 control pressure oil during injection promptly to carry out the oil return through second servo valve 600, with injection and oil return separately independent control, improve the brake response of high-speed injection room, make the injection response faster, the location is more accurate.
The first servo valve 500 controls the speed and pressure of the injection cavity of the injection molding machine through the pressure set by the injection molding machine system or the flow, so that the injection molding machine can meet the high-precision injection requirement and achieve the double-closed-loop control of pressure and flow.
The liquid-filled control valve group 200 comprises a first cartridge valve 210 and a first pilot valve 220, wherein the first pilot valve 220 is used for controlling the opening and closing of the first cartridge valve 210, in normal operation, the first cartridge valve 210 is opened, so that pressure oil can pass through the first cartridge valve 210, but in order to prevent the pressure in an oil path at one end of the accumulator 100 from being too large, an accumulator can be well protected by the first pilot valve 220, and when the pressure in the oil path at one end of the accumulator 100 is too large, the first pilot valve 220 controls the first cartridge valve 210 to be closed, so that the accumulator 100 cannot be continuously pressurized.
Pressure relief valve group 300 includes manual relief valve 310, automatic relief valve 320 and energy storage ware relief valve 330, automatic relief valve 320 sets up between first cartridge valve 210 and energy storage ware 100, manual relief valve 310 and energy storage ware relief valve 330 all meet with the energy storage ware 100 oil-out, energy storage ware relief valve 330 is used for the pressure release in energy storage ware 100 course, in case the pressure value in energy storage ware 100 is too high, the pressure release is carried out to accessible energy storage ware relief valve 330, automatic relief valve 320 then is used for when whole stop work, carry out the pressure release for energy storage ware 100, and it then provides a guarantee for automatic relief valve 320 to set up manual relief valve 310, when automatic relief valve 320 can't release the pressure, utilize manual relief valve 310 to carry out the pressure release.
The first pressure monitor 110 and the first pressure gauge 120 are connected to an oil inlet of the accumulator 100, the first pressure monitor 110 is used for controlling the opening and closing of the accumulator safety valve 330, the first pressure monitor 110 is used for detecting the overall pressure of the accumulator 100, and the sensor is equivalent to a sensor, when the pressure of the accumulator 100 is sensed to be overlarge, information is fed back to the accumulator safety valve 330, and the opening of the accumulator safety valve is controlled to release the pressure.
The tapping control valve set 400 comprises a second cartridge valve 410 and a second pilot valve 420, wherein an oil inlet of the second cartridge valve 410 is connected with an oil outlet of the energy accumulator 100, an oil outlet of the second cartridge valve 410 is connected with an oil inlet of the first servo valve 500, the second pilot valve 420 is used for controlling the opening and closing of the second cartridge valve 410, and similarly, when the pressure in an oil path leading to an injection cavity is too high, the second pilot valve 420 controls the closing of the second cartridge valve 410 to prevent the second cartridge valve 410 from being continuously pressurized.
An oil inlet of an injection cavity of the injection molding machine is connected with a second pressure monitor 510 and a second pressure gauge 520, the second pressure monitor 510 controls the opening and closing of the first servo valve 500, the second pressure monitor 510 feeds back the monitored pressure condition of the injection cavity to the first servo valve 500, and the pressure oil entering the injection cavity is controlled by adjusting the size of the opening of the first servo valve 500.
The injection molding machine is characterized by further comprising a connector 700 connected with a hydraulic pump of the injection molding machine, an oil inlet of the second servo valve 600 and an oil inlet of the first cartridge valve 210 are connected with the connector 700, pressure oil enters an injection cavity through the first cartridge valve 210 through the connector 700 during injection, and pressure oil enters an injection cavity through the second servo valve 600 during injection and retreat.
A hydraulic control method for an injection molding machine with high-speed and high-precision injection comprises the following steps:
during injection of the injection molding machine, pressure oil reaches the liquid filling control valve group 200 through the interface 700, the liquid filling control valve group 200 controls the pressure oil to fill the energy accumulator 100, the pressure oil in the energy accumulator 100 reaches the first servo valve 500 through the liquid discharging valve group, the first servo valve 500 controls the pressure or flow control pressure oil set by the injection molding machine system to enter an injection cavity of the injection molding machine, the second servo valve 600 is opened, the pressure oil in the injection cavity of the injection molding machine enters an oil tank through the second servo valve 600, the injection cavity and the pressure flow of the injection cavity are separately controllable, the brake response during high-speed injection is improved, the injection response is faster, and the positioning is more accurate.
When the injection molding machine is ejected and retreated, the first servo valve 500 and the second servo valve 600 are opened simultaneously, and pressure oil enters the ejection and retreating cavity through the second servo valve 600 and returns through the first servo valve 500.
The invention provides a hydraulic control loop and a hydraulic control method for an injection molding machine with high-speed and high-precision injection, which separately control the pressure flow of an injection cavity and an injection and retraction cavity, improve the brake response during high-speed injection, enable the injection response to be faster and the positioning to be more accurate, select the flow and pressure control during the injection action, accurately control the speed and the pressure of the injection cavity, meet the requirement of high-precision injection, achieve the double closed-loop control of the pressure flow, simultaneously select the flow and pressure control of the injection and retraction cavity, and improve the pressure or flow control precision of the injection and retraction cavity by matching with the control of the injection cavity, thereby achieving the accurate positioning of an injection piston.
The technical solutions of the present invention are explained in detail above with reference to the accompanying drawings, and the described embodiments are used to help understanding the idea of the present invention. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides an injection molding machine hydraulic control return circuit of high-speed high accuracy injection which characterized in that includes: the injection molding machine comprises an energy accumulator, a liquid filling control valve group, a pressure relief valve group, a liquid discharging control valve group, a first servo valve for controlling an injection cavity of the injection molding machine and a second servo valve for controlling an injection cavity of the injection molding machine, wherein the liquid filling control valve group is connected with an oil inlet of the energy accumulator, an oil outlet of the energy accumulator is connected with the liquid discharging control valve group, the liquid discharging control valve group is connected with an oil inlet of a first servo valve, an oil outlet of the first servo valve is connected with an oil inlet of the injection cavity of the injection molding machine, an oil outlet of the injection cavity of the injection molding machine is connected with an oil inlet of the second servo valve, an oil return port of the second servo valve is connected with an oil return port of the first servo valve, and an oil return port of the first servo valve is connected with an oil;
the first servo valve controls the speed and the pressure of an injection cavity of the injection molding machine through the pressure or the flow set by the injection molding machine system.
2. The hydraulic control circuit of an injection molding machine with high speed and high precision as claimed in claim 1, wherein the charging control valve set comprises a first cartridge valve and a first pilot valve, and the first pilot valve is used for controlling the opening and closing of the first cartridge valve.
3. The hydraulic control circuit of an injection molding machine for high-speed and high-precision injection according to claim 2, wherein the pressure relief valve set comprises a manual pressure relief valve, an automatic pressure relief valve and an accumulator safety valve, the automatic pressure relief valve is arranged between the first cartridge valve and the accumulator, and the manual pressure relief valve and the accumulator safety valve are connected with an oil outlet of the accumulator.
4. The hydraulic control circuit of an injection molding machine for high-speed and high-precision injection according to claim 3, wherein a first pressure monitor and a first pressure gauge are connected to the accumulator oil inlet, and the first pressure monitor is used for controlling the opening and closing of the accumulator safety valve.
5. The hydraulic control circuit of the injection molding machine for high-speed and high-precision injection according to claim 1, wherein the liquid discharge control valve set comprises a second cartridge valve and a second pilot valve, an oil inlet of the second cartridge valve is connected with an oil outlet of the energy accumulator, an oil outlet of the second cartridge valve is connected with an oil inlet of the first servo valve, and the second pilot valve is used for controlling opening and closing of the second cartridge valve.
6. The hydraulic control circuit of an injection molding machine for high-speed and high-precision injection according to claim 1, wherein a second pressure monitor and a second pressure gauge are connected to an oil inlet of an injection cavity of the injection molding machine, and the second pressure monitor controls the first servo valve to open and close.
7. A hydraulic control method for an injection molding machine with high-speed and high-precision injection is characterized by comprising the following steps:
when the injection molding machine injects, pressure oil reaches the liquid filling control valve group through the interface, the liquid filling control valve group controls the pressure oil to fill liquid into the energy accumulator, the pressure oil in the energy accumulator reaches the first servo valve through the liquid discharging valve group, the first servo valve controls the pressure oil to enter an injection cavity of the injection molding machine through the pressure or flow control pressure oil set by the injection molding machine system, the second servo valve is opened, and the pressure oil in the injection cavity of the injection molding machine enters an oil tank through the second servo valve;
when the injection molding machine retreats, first servo valve and second servo valve open simultaneously, and pressure oil enters into through the second servo valve and penetrates and retreat the chamber to carry out the oil return through first servo valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010096512.8A CN111251566B (en) | 2020-02-17 | 2020-02-17 | High-speed high-precision injection molding machine hydraulic control loop and method |
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| CN202010096512.8A CN111251566B (en) | 2020-02-17 | 2020-02-17 | High-speed high-precision injection molding machine hydraulic control loop and method |
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| CN111251566A true CN111251566A (en) | 2020-06-09 |
| CN111251566B CN111251566B (en) | 2022-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290805A (en) * | 2021-04-09 | 2021-08-24 | 宁波伊士通技术股份有限公司 | Back pressure control method of hydraulic injection molding machine |
| CN115846614A (en) * | 2023-03-02 | 2023-03-28 | 宁波力劲科技有限公司 | Automatic oil return die casting machine knockout system and control method |
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| GB905497A (en) * | 1959-06-08 | 1962-09-12 | Tos Rakovnik | Improvements in or relating to hydraulic control apparatus |
| US3956973A (en) * | 1972-07-11 | 1976-05-18 | Basic Aluminum Castings Company | Die casting machine with piston positioning control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290805A (en) * | 2021-04-09 | 2021-08-24 | 宁波伊士通技术股份有限公司 | Back pressure control method of hydraulic injection molding machine |
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| CN115846614A (en) * | 2023-03-02 | 2023-03-28 | 宁波力劲科技有限公司 | Automatic oil return die casting machine knockout system and control method |
| CN115846614B (en) * | 2023-03-02 | 2023-05-30 | 宁波力劲科技有限公司 | Automatic oil return die casting machine material beating system and control method |
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