CN107498813B - Injection hydraulic circuit of injection molding machine for realizing high-response injection and injection control method of injection hydraulic circuit - Google Patents
Injection hydraulic circuit of injection molding machine for realizing high-response injection and injection control method of injection hydraulic circuit Download PDFInfo
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- CN107498813B CN107498813B CN201710867185.XA CN201710867185A CN107498813B CN 107498813 B CN107498813 B CN 107498813B CN 201710867185 A CN201710867185 A CN 201710867185A CN 107498813 B CN107498813 B CN 107498813B
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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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- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76775—Fluids
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection hydraulic circuit of an injection molding machine for realizing high-response injection and an injection control method thereof, wherein the injection hydraulic circuit comprises an injection oil cylinder (3) and a main oil way connected with the injection oil cylinder (3), the injection hydraulic circuit of the injection molding machine also comprises a control oil way, the control oil way consists of a second electromagnetic valve (4), a second overflow valve (5) and a cartridge valve (6), the safety pressure of a hydraulic pump system (1) is P1, the working pressure of the second electromagnetic valve (4) is P2, and P1 is larger than P2. The beneficial effects of the invention are as follows: the control oil way is added to the oil inlet (pressure oil inlet) of the injection electromagnetic reversing valve to replace a complex accumulator in the existing oil way, and the pressure oil of the injection molding machine is always kept at constant pressure and flow before injection through the cooperation action of the overflow valve and the cartridge valve, so that the injection molding machine can obtain higher injection molding response during injection molding, the injection repetition precision is improved on the basis of reducing the energy consumption of equipment, and the production efficiency of the injection molding machine is improved.
Description
Technical Field
The invention relates to an injection hydraulic circuit of an injection molding machine for realizing high-response injection and an injection control method thereof, and belongs to the technical field of oil circuit systems of injection molding machines of molds.
Background
The injection response of an injection molding machine refers to the time taken for the injection speed to accelerate from zero to maximum at injection, the shorter the time the better the performance. In particular, for injection molding of thin-walled plastic articles, a very high injection speed is required, injection response is a very critical performance indicator, and generally a faster injection response makes injection molding easier and requires less mold locking force. The traditional injection loop has no control branch, can not realize the acceleration in advance before injection, can accelerate from zero to a set value only after the start of injection action, and seriously influences the injection performance.
In order to improve injection response, most of the existing injection hydraulic circuits of injection molding machines adopt circuits with accumulators. The circuit is characterized in that an accumulator device is added at the outlet of the oil pump, the pressure oil is always supplied by the accumulator for injection, and the accumulator cannot adjust the flow and the pressure, so that an expensive proportional valve is required to control the injection oil cylinder for injection, and the oil pump is required to charge the hydraulic oil into the accumulator at the highest pressure at first no matter what speed and pressure are required for actual action, thereby causing higher energy consumption.
In addition, since the injection is always performed immediately after the mold locking, the existing injection circuit and its control method will have a process of pressure drop after the mold locking is completed, and the process cannot be identical each time, so that the state of the system pressure oil is different before each injection, and thus the injection repetition precision is poor, in order to eliminate such deviation, a delay time is often added before the injection to be stable in pressure, and thus the production efficiency is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an injection hydraulic circuit of an injection molding machine for realizing high-response injection and an injection control method thereof, which can improve the injection repetition precision and the production efficiency of the injection molding machine on the basis of reducing the equipment energy consumption.
The aim of the invention is realized by the following technical scheme: the injection hydraulic circuit of the injection molding machine comprises an injection oil cylinder and a main oil way connected with the injection oil cylinder, wherein a hydraulic pump system and a first electromagnetic reversing valve are arranged on the main oil way, the injection hydraulic circuit of the injection molding machine further comprises a control oil way, the control oil consists of a second electromagnetic valve, a second overflow valve and a cartridge valve, a control oil port and an oil inlet of the cartridge valve are communicated, an oil inlet of the cartridge valve is communicated with an oil inlet of the first electromagnetic reversing valve on the main oil way, a control oil port of the cartridge valve is switched to be connected with an oil inlet of the second overflow valve through the second electromagnetic valve, oil return ports of the second overflow valve, the cartridge valve and the second electromagnetic valve are connected to an oil tank, the safety pressure of the hydraulic pump system is P1, and the working pressure of the second electromagnetic valve is P2, wherein P1 is larger than P2.
Preferably, the hydraulic pump system comprises a hydraulic pump and a servo motor for driving the hydraulic pump, wherein an oil outlet of the hydraulic pump is connected with and disconnected from two working cavities of the injection cylinder through a first electromagnetic directional valve, and the first electromagnetic directional valve is a three-position four-way valve.
Preferably, the main oil way is provided with an overflow branch and an oil pressure sensor, the overflow branch is provided with a first overflow valve, and the first overflow valve mainly plays roles of constant pressure overflow, pressure stabilization, system unloading and safety protection in the main oil way.
Preferably, the second electromagnetic valve is a two-position three-way valve.
Preferably, the main oil way is provided with a high-pressure hose connecting structure, the high-pressure hose connecting structure can be used on some moving parts, and software has certain ductility and can be adjusted along with the movement of a movable die on the injection molding machine.
And an oil return port of the first electromagnetic reversing valve is communicated with the oil tank.
An injection control method for an injection hydraulic circuit of an injection molding machine for realizing high-response injection comprises the following steps:
S1, pressure presetting: before the injection molding machine leaves the factory, checking and adjusting the safety pressure of the second overflow valve to be P2, and simultaneously checking and adjusting the safety pressure of the hydraulic pump system to be P1, wherein P1 is 5-15bar larger than P2;
S2, accelerating in advance before injection: before injection after the injection molding machine is locked, a hydraulic pump in the hydraulic pump system is loaded, and a second electromagnetic valve is opened at the same time, so that the pressure in the system is limited to the safety pressure P2 of a second overflow valve, and the hydraulic pump is accelerated to the maximum speed Vmax at the set pressure P2 of the second electromagnetic valve;
s3, injection: when in injection, the first electromagnetic reversing valve is opened, the second electromagnetic valve is closed at the same time, pressure oil enters the injection cylinder to perform injection action, at the moment, the safety pressure P1 of the system is reached, once the injection action is started, the hydraulic pump works at the speed V1 set by the injection process, and the injection action is continued until the injection is completed.
The safety pressure P2 of the second overflow valve is 160-170bar, and the safety pressure P1 of the hydraulic pump system is 170-180 bar.
The safety pressure P1 of the hydraulic pump system is regulated by a first relief valve on the relief branch.
The process set speed V1 of the hydraulic pump during injection is smaller than the maximum speed Vmax of the hydraulic pump accelerated in advance before injection.
The beneficial effects of the invention are as follows: the control oil way is added to the oil inlet (pressure oil inlet) of the injection electromagnetic reversing valve to replace a complex energy accumulator in the existing oil way, and the pressure oil of the system before injection of the injection molding machine is always kept at constant pressure and flow through the cooperation action of the overflow valve and the cartridge valve, that is to say, the state before the injection action is always constant, so that the injection molding machine can obtain higher injection molding response during injection molding, the injection repetition precision is improved on the basis of reducing the equipment energy consumption, the production efficiency of the injection molding machine is improved, and the injection molding machine has the characteristics of simple structure and convenience in use.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural view of the control oil passage of the present invention.
In the figure, a 1-hydraulic pump system, a 2-first electromagnetic directional valve, a 3-injection oil cylinder, a 4-second electromagnetic valve, a 5-second overflow valve, a 6-cartridge valve, a 7-oil tank, a 101-hydraulic pump, a 102-servo motor, a 103-oil pressure sensor and a 104-first overflow valve are arranged.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1, the injection hydraulic circuit of the injection molding machine for realizing high-response injection comprises an injection oil cylinder 3 and a main oil way connected with the injection oil cylinder 3, wherein the main oil way is provided with a hydraulic pump system 1 and a first electromagnetic directional valve 2, the injection hydraulic circuit of the injection molding machine further comprises a control oil way, the control oil way consists of a second electromagnetic valve 4, a second overflow valve 5 and a cartridge valve 6, a control oil port of the cartridge valve 6 is communicated with an oil inlet of the first electromagnetic directional valve 2 on the main oil way, the on-off of the oil inlet of the second overflow valve 5 is switched through the second electromagnetic valve 4, the second overflow valve 5, the cartridge valve 6 and an oil return port of the second electromagnetic valve 4 are all connected to an oil tank 7, the safety pressure of the hydraulic pump system 1 is P1, and the working pressure of the second electromagnetic valve 4 is P2, and P1 is greater than P2.
The hydraulic pump system 1 comprises a hydraulic pump 101 and a servo motor 102 for driving the hydraulic pump 101, wherein an oil outlet of the hydraulic pump 101 is connected and disconnected with two working cavities of the injection cylinder 3 through a first electromagnetic directional valve 2, so that the expansion, contraction and stop working conditions of the injection cylinder 3 are realized, and the first electromagnetic directional valve 2 is a three-position four-way valve.
The main oil way on be provided with overflow branch road and oil pressure sensor 103, be provided with first overflow valve 104 on the overflow branch road, oil pressure sensor 103 can reflect the oil pressure on the main oil way in real time, is convenient for observe and record.
The second electromagnetic valve 4 is a two-position three-way valve.
The main oil way is provided with a high-pressure hose connecting structure.
The oil return port of the first electromagnetic directional valve 2 is communicated with an oil tank 7.
Specifically, as shown in fig. 1, a P port (oil inlet), a T port (oil return port) and a B port (oil outlet) are formed in the first electromagnetic directional valve 2, when the second electromagnetic valve 4 is not started, the P port of the first electromagnetic directional valve 2 is not communicated, the pressure of a control cavity (communicated with the control oil port) and a working cavity (communicated with the oil inlet) of the second electromagnetic valve 4 is the pressure P1 in a main oil path, after the second electromagnetic valve 4 is started, the P port of the first electromagnetic directional valve 2 is communicated with the B port, and the pressure in the oil path is relieved through the second overflow valve 5, so that the pressure oil of a system before injection molding of the injection molding machine is always kept constant in pressure and flow, that is, the state before injection molding is always constant, and the injection molding machine can obtain higher injection molding response during injection molding.
An injection control method for an injection hydraulic circuit of an injection molding machine for realizing high-response injection comprises the following steps:
S1, pressure presetting: before the injection molding machine leaves the factory, checking and adjusting the safety pressure of the second overflow valve 5 to be P2, and simultaneously checking and adjusting the safety pressure of the hydraulic pump system 1 to be P1, wherein P1 is 5-15bar larger than P2;
S2, accelerating in advance before injection: before injection after the injection molding machine is locked, the hydraulic pump 101 in the hydraulic pump system 1 is loaded, and simultaneously the second electromagnetic valve 4 is opened, so that the pressure in the system is limited to the safety pressure P2 of the second overflow valve 5, and the hydraulic pump 101 is accelerated to the maximum speed Vmax at the set pressure P2 of the second electromagnetic valve 4;
S3, injection: when injection is performed, the first electromagnetic directional valve 2 is opened, the second electromagnetic valve 4 is closed, pressure oil enters the injection cylinder 3 to perform injection, at the moment, the safety pressure P1 of the system is reached, once the injection starts, the hydraulic pump 101 works at the speed V1 set by the injection process, and the injection is continued until the injection is completed.
The safety pressure P2 of the second overflow valve 5 is 160-170bar, and the safety pressure P1 of the hydraulic pump system 1 is 170-180bar.
The relief pressure P1 of the hydraulic pump system 1 is regulated by a first relief valve 104 in the relief branch.
The process set speed V1 of the hydraulic pump 101 at the time of injection is smaller than the maximum speed Vmax of the hydraulic pump 101 accelerated in advance before injection.
According to the invention, the hydraulic pump 101 can reach a stable state after the acceleration time is 100-250ms after the injection molding machine is locked, then the injection molding machine can rapidly respond during injection molding, injection molding is performed at constant pressure and speed, the safety pressure P2 of the second overflow valve 5 in the injection loop is 5-15bar smaller than the safety pressure P1 of the hydraulic pump system 1, the hydraulic pump 101 can be effectively in a higher response level by the setting of the pre-acceleration before injection, compared with the existing action mode, the hydraulic pump 101 can accelerate from zero to a set value only after the injection action starts, the injection performance is seriously influenced, and the hydraulic pump 101 is in a higher response level during injection molding, so that the injection molding machine can perform injection molding at constant pressure and preset speed during injection molding, the injection molding quality is higher, and the injection response time can reach 30-60ms. The existing control mode is that after the mode locking is completed, 100 ms-300 ms of time delay (the time delay depends on the speed of system pressure reduction) is passed, at the moment, the oil pump is not loaded, the pressure in the system is waited to be reduced to a stable state, then injection is started, and the response of the injection molding machine is slow. Wherein, the switching of the second electromagnetic valve 4 and the first overflow valve 104 is controlled by a PLC.
It can be seen that the present invention adds a control oil path to the pressure oil inlet of the first electromagnetic directional valve 2. The pressure of the second solenoid valve 4 in the control oil line is set to a higher pressure P2 (which may be typically set to the maximum system pressure of the injection molding machine) but is smaller than the safety pressure P1 of the hydraulic pump system 1 (set by a relief valve provided at the hydraulic pump pressure outlet). When injection is to be performed, the second electromagnetic valve 4 is opened firstly, meanwhile, the hydraulic pump 101 is accelerated to the maximum speed at the set pressure P2 of the second electromagnetic valve 4, the time of the acceleration operation can be set by a control computer, then the first electromagnetic reversing valve 2 is opened, the second electromagnetic valve 4 is closed, pressure oil enters the injection cylinder 3 to perform injection operation, once the injection operation starts, the hydraulic pump 101 works at the speed and the pressure set by the proper injection process, and the injection operation is continued until the injection is completed.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept described herein, either as a result of the foregoing teachings or as a result of the teaching or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the invention as defined in the appended claims.
Claims (10)
1. The injection hydraulic circuit of the injection molding machine for realizing high-response injection comprises an injection oil cylinder (3) and a main oil way connected with the injection oil cylinder (3), wherein the main oil way is provided with a hydraulic pump system (1) and a first electromagnetic directional valve (2), the hydraulic pump system (1) comprises a hydraulic pump (101) and a servo motor (102) for driving the hydraulic pump (101), the injection hydraulic circuit is characterized by further comprising a control oil way, the control oil way is composed of a second electromagnetic valve (4), a second overflow valve (5) and a cartridge valve (6), a control oil port of the cartridge valve (6) is communicated with an oil inlet port of the first electromagnetic directional valve (2) on the main oil way, the control oil port of the cartridge valve (6) is switched to be connected with an oil inlet of the second overflow valve (5) through the second electromagnetic valve (4), the second overflow valve (5), the cartridge valve (6) and an oil return port of the second electromagnetic valve (4) are connected to an oil tank (7), the safety pressure of the hydraulic pump system (1) is P1, and the working pressure of the second electromagnetic valve (4) is greater than P2;
before injection after the injection molding machine is locked, a hydraulic pump (101) in the hydraulic pump system (1) is loaded, a second electromagnetic valve (4) is opened at the same time, the pressure in the system is limited to the safety pressure P2 of a second overflow valve (5), and the hydraulic pump (101) is accelerated to the maximum speed Vmax by the set pressure P2 of the second electromagnetic valve (4); wherein the injection molding response time is 30-60ms.
2. The injection hydraulic circuit of the injection molding machine for realizing high-response injection according to claim 1, wherein an oil outlet of the hydraulic pump (101) is connected and disconnected with two working cavities of the injection cylinder (3) through a first electromagnetic directional valve (2), and the first electromagnetic directional valve (2) is a three-position four-way valve.
3. The injection hydraulic circuit of the injection molding machine for realizing high-response injection according to claim 1, wherein an overflow branch and an oil pressure sensor (103) are arranged on the main oil path, and a first overflow valve (104) is arranged on the overflow branch.
4. Injection hydraulic circuit of an injection molding machine for realizing high response injection according to claim 1, wherein the second electromagnetic valve (4) is a two-position three-way valve.
5. The injection hydraulic circuit for the injection molding machine for realizing high-response injection according to claim 1, wherein the main oil way is provided with a high-pressure hose connecting structure.
6. Injection hydraulic circuit of an injection molding machine for realizing high response injection according to claim 1, characterized in that the oil return port of the first electromagnetic directional valve (2) is communicated with an oil tank (7).
7. An injection control method for an injection hydraulic circuit of an injection molding machine for realizing high-response injection according to any one of claims 1 to 6, comprising the steps of:
S1, pressure presetting: before the injection molding machine leaves the factory, checking and adjusting the safety pressure of the second overflow valve (5) to be P2, and simultaneously checking and adjusting the safety pressure of the hydraulic pump system (1) to be P1, wherein P1 is 5-15bar larger than P2;
s2, accelerating in advance before injection: before injection after the injection molding machine is locked, a hydraulic pump (101) in the hydraulic pump system (1) is loaded, and a second electromagnetic valve (4) is opened at the same time, so that the pressure in the system is limited to the safety pressure P2 of a second overflow valve (5), and the hydraulic pump (101) is accelerated to the maximum speed Vmax by the set pressure P2 of the second electromagnetic valve (4);
s3, injection: when in injection, the first electromagnetic directional valve (2) is opened, the second electromagnetic valve (4) is closed, pressure oil enters the injection cylinder (3) to perform injection action, at the moment, the safety pressure P1 of the system is reached, once the injection action is started, the hydraulic pump (101) works at the speed V1 set by the injection process, and the injection action is continued until the injection is completed.
8. The injection control method for the injection hydraulic circuit of the injection molding machine for realizing high-response injection according to claim 7, wherein the safety pressure P2 of the second overflow valve (5) is 160-170bar, and the safety pressure P1 of the hydraulic pump system (1) is 170-180bar.
9. The injection control method of an injection hydraulic circuit of an injection molding machine for achieving high-response injection according to claim 7, wherein the safety pressure P1 of the hydraulic pump system (1) is regulated by a first relief valve (104) on the relief branch.
10. The injection control method of the injection hydraulic circuit of the injection molding machine for realizing high-response injection according to claim 7, wherein the process set speed V1 of the hydraulic pump (101) during injection is smaller than the maximum speed Vmax of the hydraulic pump (101) accelerated before injection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710867185.XA CN107498813B (en) | 2017-09-22 | 2017-09-22 | Injection hydraulic circuit of injection molding machine for realizing high-response injection and injection control method of injection hydraulic circuit |
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| CN201710867185.XA CN107498813B (en) | 2017-09-22 | 2017-09-22 | Injection hydraulic circuit of injection molding machine for realizing high-response injection and injection control method of injection hydraulic circuit |
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| CN107498813B true CN107498813B (en) | 2024-09-20 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109177104B (en) * | 2018-09-29 | 2024-12-03 | 海天塑机集团有限公司 | A protective device for an injection seat of a motor |
| CN111590838A (en) * | 2020-04-16 | 2020-08-28 | 姚惠祥 | Injection reducing cylinder of injection molding machine |
| CN112109275B (en) * | 2020-09-02 | 2022-05-31 | 凯勒(南京)新材料科技有限公司 | Connecting structure of injection molding machine and mold and connecting and using method |
| CN114851498B (en) * | 2022-04-01 | 2024-06-14 | 常熟拓斯达智能装备有限公司 | Injection molding pressure stabilizing oil circuit system and injection molding machine |
| CN119116302A (en) * | 2024-11-15 | 2024-12-13 | 宁波力劲塑机智造有限公司 | Hydraulic system and injection molding machine |
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| CN201979667U (en) * | 2010-12-06 | 2011-09-21 | 浙江德库玛机械有限公司 | Accumulator-aided quick injection mechanism for injection molding machine |
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| CN207156388U (en) * | 2017-09-22 | 2018-03-30 | 成都市联余精密机械有限公司 | A kind of injection machine injection hydraulic circuit for realizing high response injection |
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| CN206344426U (en) * | 2016-11-24 | 2017-07-21 | 无锡海天机械有限公司 | A kind of integral type back pressure controls oil circuit |
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| CN201979667U (en) * | 2010-12-06 | 2011-09-21 | 浙江德库玛机械有限公司 | Accumulator-aided quick injection mechanism for injection molding machine |
| CN206254451U (en) * | 2016-12-15 | 2017-06-16 | 群达模具(深圳)有限公司 | A kind of quick response servo-control system of injection moulding machine |
| CN207156388U (en) * | 2017-09-22 | 2018-03-30 | 成都市联余精密机械有限公司 | A kind of injection machine injection hydraulic circuit for realizing high response injection |
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