CN108215108B - Quick response servo control system of injection molding machine - Google Patents
Quick response servo control system of injection molding machine Download PDFInfo
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- CN108215108B CN108215108B CN201611162099.0A CN201611162099A CN108215108B CN 108215108 B CN108215108 B CN 108215108B CN 201611162099 A CN201611162099 A CN 201611162099A CN 108215108 B CN108215108 B CN 108215108B
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- oil
- injection molding
- hydraulic pump
- cylinder
- hydraulic
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 69
- 230000004044 response Effects 0.000 title claims abstract description 35
- 239000003921 oil Substances 0.000 claims abstract description 133
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 238000005086 pumping Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000001133 acceleration Effects 0.000 description 9
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a quick response servo control system of an injection molding machine, which comprises: the hydraulic control system comprises an oil tank (1), a hydraulic pump (4), a servo motor (3), an oil return electromagnetic valve (5) and a servo electromagnetic valve (6). According to the system provided by the invention, before injection molding, the hydraulic oil pumped by the hydraulic pump is led back to the oil tank by adopting the oil return electromagnetic valve, so that the servo motor for controlling the hydraulic pump can reach the maximum rotating speed before injection molding, and the problem of slow response speed of the servo motor caused by the time required by rotating speed lifting is solved, so that when injection molding is started, the servo motor for high-speed operation controls the hydraulic pump, the hydraulic oil in the oil tank is pumped into the injection oil tank through the servo electromagnetic valve to perform injection molding, the injection molding response speed of the system is greatly improved, and the injection molding requirement of thin-wall products is met. The system has the advantages of compact structure, simple oil way, high control precision, easy debugging, excellent dynamic stability and high-precision energy-saving property of the servo motor.
Description
Technical Field
The invention relates to the technical field of injection control, in particular to a quick response servo control system of an injection molding machine.
Background
In recent years, with the acceleration of 3C products such as notebook computers, mobile phones, and personal digital assistants, the design concept of the products is being developed toward "light, thin, short, and small". Because the thin-wall product has the advantages of less material consumption, quick period and the like, the demand of people for the thin-wall product is increased, and the thin-wall injection molding technology is promoted to be rapidly developed. However, the thin-wall injection molding technology requires high injection speed and high injection acceleration in the initial injection stage, namely, high injection response in the initial injection stage, but the conventional injection molding machine is difficult to meet the requirement of the thin-wall product on the quick injection response in the initial injection stage.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a quick response servo control system of an injection molding machine. The technical scheme is as follows:
in one aspect, embodiments of the present invention provide a fast response servo control system for an injection molding machine, the injection molding machine comprising: an injection ram, the injection ram comprising: the cylinder barrel, the piston and the cylinder cover form a first inner cavity, and the cylinder barrel, the piston and the cylinder bottom form a second inner cavity;
the system comprises:
the oil tank is used for storing hydraulic oil;
the hydraulic pump is respectively communicated with the oil tank and the injection oil cylinder and is used for pumping the hydraulic oil in the oil tank into the injection oil cylinder;
the servo motor is connected with the hydraulic pump and used for controlling the hydraulic pump to work;
the oil return electromagnetic valve is respectively communicated with the oil tank and the oil outlet of the hydraulic pump and is used for guiding hydraulic oil pumped by the hydraulic pump back to the oil tank before injection molding begins; the hydraulic pump is also used for stopping the part of hydraulic oil pumped out by the hydraulic pump from being led back to the oil tank when injection molding starts;
the servo electromagnetic valve is respectively communicated with the first inner cavity, the second inner cavity of the injection cylinder, the oil outlet of the hydraulic pump and the oil tank, and is used for guiding hydraulic oil pumped by the hydraulic pump into the second inner cavity and simultaneously guiding the hydraulic oil in the first inner cavity back to the oil tank when injection molding starts.
In the fast response servo control system of the injection molding machine according to the embodiment of the invention, the servo solenoid valve includes: a first working oil port communicated with the first inner cavity, a second working oil port connected with the second inner cavity, an oil inlet connected with an oil outlet of the hydraulic pump, and an oil outlet connected with the oil tank,
the servo solenoid valve is used for conducting the oil inlet and the second working oil port when injection molding starts, and simultaneously conducting the first working oil port and the oil outlet.
In the fast response servo control system of the injection molding machine according to the embodiment of the invention, the servo solenoid valve is a two-position four-way solenoid valve or a three-position four-way solenoid valve.
In the fast response servo control system of the injection molding machine according to the embodiment of the invention, the oil return electromagnetic valve is a two-position two-way electromagnetic valve.
In the fast response servo control system of the injection molding machine according to the embodiment of the invention, the hydraulic pump is a unidirectional quantitative hydraulic pump.
In the fast response servo control system of the injection molding machine according to the embodiment of the invention, the fast response servo control system further includes: a filter connected between the hydraulic pump and the tank.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
through before moulding plastics, adopt the oil return solenoid valve to lead the hydraulic oil that the hydraulic pump pumped back to in the oil tank for the servo motor of control hydraulic pump can reach maximum rotational speed before moulding plastics, has overcome servo motor because the slow problem of response speed that the rotational speed promotes the required time and lead to, like this when beginning to mould plastics, the servo motor control hydraulic pump of high-speed operation, with the hydraulic oil in the oil tank, through servo solenoid valve, pump into the injection cylinder, carry out the work of moulding plastics, improved the response speed of moulding plastics of this system greatly, satisfied the requirement of moulding plastics of thin wall product. In addition, the system has excellent dynamic stability and response rapidness, and is compact in structure, simple in oil way, high in control precision, easy to debug, capable of performing closed-loop control on injection speed, enabling the acceleration response time of the injection speed to reach the acceleration response time of the servo electromagnetic valve, and maintaining the high-precision energy-saving characteristic of the servo motor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an injection cylinder according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fast response servo control system of an injection molding machine according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Before describing the present embodiment, a detailed description will be given of the structure of an injection cylinder in an injection molding machine controlled by a fast response servo control system of the injection molding machine with reference to fig. 1. Referring to fig. 1, the injection cylinder includes: the cylinder 701, the cylinder head 702 and the cylinder bottom 703 provided at both ends of the cylinder, the piston 704 provided in the cylinder 701, and the piston rod 705 having one end connected to the piston 704 and the other end extending out of the cylinder head 702, the cylinder 701, the piston 704, and the cylinder head 702 constitute the first inner chamber 71, and the cylinder 701, the piston 704, and the cylinder bottom 703 constitute the second inner chamber 72. When the injection cylinder 7 starts to work, hydraulic oil is injected into the second inner cavity 72, and meanwhile, the hydraulic oil in the first inner cavity 71 is led out, so that the piston 704 moves towards the cylinder cover 702 under the pushing of the hydraulic oil in the second inner cavity 72, and meanwhile, a piston rod 705 connected to the piston 704 is driven to extend out of the cylinder cover 702, so that injection molding is completed; after injection molding is completed, hydraulic oil is injected into the first inner cavity 71, and meanwhile, hydraulic oil in the second inner cavity 72 is led out, so that the piston 704 moves towards the cylinder bottom 703 under the pushing of the hydraulic oil in the first inner cavity 71, and meanwhile, the piston rod 705 is driven to retract into the cylinder 701, so that the resetting of the injection cylinder is completed.
Example 1
The embodiment of the invention provides a quick response servo control system of an injection molding machine, which is particularly suitable for preparing thin-wall products, and referring to fig. 2, the system can comprise:
and a tank 1 for storing hydraulic oil.
The hydraulic pump 4 is respectively communicated with the oil tank 1 and the injection oil cylinder 7 and is used for pumping the hydraulic oil in the oil tank 1 into the injection oil cylinder 7.
And the servo motor 3 is connected with the hydraulic pump 4 and is used for controlling the hydraulic pump 4 to work.
The oil return electromagnetic valve 5 is respectively communicated with the oil outlets of the oil tank 1 and the hydraulic pump 4 and is used for guiding the hydraulic oil pumped by the hydraulic pump 4 back to the oil tank 1 before injection molding begins; but also to stop the introduction of part of the hydraulic oil pumped out by the hydraulic pump 4 back to the tank 1 at the start of injection.
The servo solenoid valve 6 is respectively communicated with the first inner cavity 71, the second inner cavity 72 of the injection cylinder 7, the oil outlet of the hydraulic pump 4 and the oil tank 1, and is used for guiding the hydraulic oil pumped out by the hydraulic pump 4 into the second inner cavity 72 and simultaneously guiding the hydraulic oil in the first inner cavity 71 back into the oil tank 1 when injection molding starts.
It should be noted that, injection molding of the thin-wall product has higher requirements than injection molding of the conventional product, mainly, the injection molding machine has higher injection acceleration at the injection start time, so that the injection molding speed can quickly reach the injection molding requirement, namely, the injection molding response speed is required to be high. In order to meet the above requirements, in this embodiment, before injection molding starts, the servo motor 3 is started, meanwhile, under the action of the oil return electromagnetic valve 5, the hydraulic oil pumped by the hydraulic pump 4 can be led back into the oil tank 1, so that the servo motor 3 can reach the maximum rotation speed before injection molding starts, and thus, when injection molding starts, the problem that the rotation speed of the servo motor 3 needs to be increased for a long time, the starting response is slow can be effectively overcome, and the injection acceleration at the initial stage of injection molding is improved. Specifically, when injection molding starts, the oil return solenoid valve 5 and the servo solenoid valve 6 simultaneously respond quickly, the oil return solenoid valve 5 stops guiding part of the hydraulic oil pumped out by the hydraulic pump 4 back to the oil tank 1, the servo solenoid valve 6 guides the hydraulic oil pumped out by the hydraulic pump 4 into the second inner cavity 72 and simultaneously guides the hydraulic oil in the first inner cavity 71 back to the oil tank 1, so that the hydraulic oil amount introduced into the second inner cavity 72 when injection molding starts is ensured, and the injection cylinder 7 has larger injection molding acceleration.
The servo solenoid valve 6 is also used to guide the hydraulic oil pumped by the hydraulic pump 4 into the first chamber 71 and simultaneously to guide the hydraulic oil in the second chamber 72 back into the tank 1 when the injection cylinder 7 is reset. It should be noted that, the resetting of the injection cylinder 7 may be performed simultaneously with the oil return operation of the oil return solenoid valve 5, so that the hydraulic oil pumped by the hydraulic pump 4 is divided into two parts, one part of the hydraulic oil is led into the first inner cavity 71 through the servo solenoid valve 6 for resetting the injection cylinder 7, and the other part of the hydraulic oil flows back into the oil tank 1 through the oil return solenoid valve 5. Of course, the above two processes may be performed separately, which is not limited herein.
Specifically, referring to fig. 1, the servo solenoid valve 6 may include: a first working port 61 communicating with the first inner chamber 71, a second working port 62 connected with the second inner chamber 72, an oil inlet 63 connected with an oil outlet of the hydraulic pump 4, and an oil outlet 64 connected with the oil tank 1.
The servo solenoid valve 6 is used for conducting the oil inlet 63 with the second working oil port 62 and simultaneously conducting the first working oil port 61 with the oil outlet 64 when injection molding starts.
In this embodiment, the servo solenoid valve 6 may also be used to conduct the oil inlet 63 with the first working oil port 61 and conduct the second working oil port 62 with the oil outlet 64 when the injection cylinder 7 is reset.
Alternatively, the servo solenoid valve 6 may be a two-position four-way solenoid valve, or a three-position four-way solenoid valve.
In this embodiment, when the servo solenoid valve 6 is a two-position four-way solenoid valve, there are two main modes, one is to conduct the oil inlet 63 with the second working oil port 62 and conduct the first working oil port 61 with the oil outlet 64 at the beginning of injection molding; and secondly, when the injection cylinder 7 is reset, the oil inlet 63 is communicated with the first working oil port 61, and the second working oil port 62 is communicated with the oil outlet 64. At this time, the resetting of the injection cylinder 7 may be performed simultaneously with the oil return operation of the oil return solenoid valve 5. When the servo solenoid valve 6 is a three-position four-way solenoid valve, in addition to the two working modes, the servo solenoid valve can be in a third working mode, and in this working mode, all the four ports (i.e., the first working oil port 61, the second working oil port 62, the oil inlet 63, and the oil outlet 64) of the servo solenoid valve 6 are not conducted with each other. This mode of operation may be used in combination with the oil return operation of the oil return solenoid valve 5.
Alternatively, the oil return solenoid valve 5 may be a two-position two-way solenoid valve. At this time, the oil return solenoid valve 5 has two operation modes, one of which is to turn on its two operation ports (not shown in the drawing) and the other of which is to turn off its communication between its two operation ports.
Alternatively, the hydraulic pump 4 may be a unidirectional quantitative hydraulic pump, which facilitates control of the flow direction and flow rate of the hydraulic oil, and facilitates accurate control of injection speed.
Optionally, referring to fig. 2, the system may further include: a filter 2 connected between the hydraulic pump 4 and the tank 1 for filtering impurities in the hydraulic oil.
The following briefly describes a fast response servo control system of the injection molding machine to control an injection molding process of injection molding with reference to the accompanying drawings.
Before injection molding starts, the servo motor 3 is started to rotate, and meanwhile, the oil return electromagnetic valve 5 conducts oil outlets of the oil tank 1 and the hydraulic pump 4, so that hydraulic oil pumped by the hydraulic pump 4 is led back to the oil tank 1, and in the process, the rotating speed of the servo motor 3 can reach the maximum before injection molding starts, and the response speed of the servo motor 3 can be effectively improved.
At the beginning of injection molding, the oil return electromagnetic valve 5 stops conducting the oil outlets of the oil tank 1 and the hydraulic pump 4, meanwhile, the oil outlet 63 of the servo electromagnetic valve 6 is conducted with the second working oil outlet 62, the first working oil outlet 61 is conducted with the oil outlet 64 (namely, the hydraulic oil pumped out by the hydraulic pump 4 is led into the second inner cavity 72, the hydraulic oil in the first inner cavity 71 is led back into the oil tank 1), at the moment, the servo motor 3 which is always in the maximum rotation speed work controls the hydraulic pump 4 to pump the hydraulic oil out of the oil tank 1 into the second inner cavity 72, and the injection molding work starts to be performed rapidly.
When injection molding is completed, the servo motor 3 is still operated for a period of time to complete resetting of the injection cylinder 7, and at this time, the servo solenoid valve 6 conducts the oil inlet 63 with the first working oil port 61, and simultaneously conducts the second working oil port 62 with the oil outlet 64 (i.e., the hydraulic oil pumped out by the hydraulic pump 4 is led into the first inner cavity 71, and the hydraulic oil in the second inner cavity 72 is led back into the oil tank 1).
According to the quick response servo control system of the injection molding machine, before injection molding, the hydraulic oil pumped by the hydraulic pump is led back to the oil tank by the oil return electromagnetic valve, so that the servo motor for controlling the hydraulic pump can reach the maximum rotating speed before injection molding, the problem of slow response speed of the servo motor due to the time required for rotating speed lifting is solved, when injection molding is started, the servo motor for high-speed operation controls the hydraulic pump, the hydraulic oil in the oil tank is pumped into the injection oil tank through the servo electromagnetic valve to perform injection molding work, the injection molding response speed of the system is greatly improved, and the injection molding requirement of thin-wall products is met. In addition, the system has excellent dynamic stability and response rapidness, and is compact in structure, simple in oil way, high in control precision, easy to debug, capable of performing closed-loop control on injection speed, enabling the acceleration response time of the injection speed to reach the acceleration response time of the servo electromagnetic valve, and maintaining the high-precision energy-saving characteristic of the servo motor.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. A fast response servo control system for an injection molding machine, the injection molding machine comprising: an injection cylinder (7), the injection cylinder (7) comprising: a cylinder (701), a cylinder head (702) and a cylinder bottom (703) which are arranged at two ends of the cylinder, a piston (704) which is arranged in the cylinder (701), and a piston rod (705) one end of which is connected with the piston (704) and the other end of which extends out of the cylinder head (702), wherein the cylinder (701), the piston (704) and the cylinder head (702) form a first inner cavity (71), and the cylinder (701), the piston (704) and the cylinder bottom (703) form a second inner cavity (72);
characterized in that the system comprises:
the oil tank (1) is used for storing hydraulic oil;
the hydraulic pump (4) is respectively communicated with the oil tank (1) and the injection oil cylinder (7) and is used for pumping the hydraulic oil in the oil tank (1) into the injection oil cylinder (7);
the servo motor (3) is connected with the hydraulic pump (4) and used for controlling the hydraulic pump (4) to work;
the oil return electromagnetic valve (5) is respectively communicated with the oil outlets of the oil tank (1) and the hydraulic pump (4) and is used for guiding the hydraulic oil pumped by the hydraulic pump (4) back to the oil tank (1) before injection molding begins; the hydraulic pump is also used for stopping the partial hydraulic oil pumped out by the hydraulic pump (4) from being led back to the oil tank (1) when injection molding starts;
a servo electromagnetic valve (6) which is respectively communicated with a first inner cavity (71), a second inner cavity (72) of the injection cylinder (7), an oil outlet of the hydraulic pump (4) and the oil tank (1) and is used for guiding the hydraulic oil pumped out by the hydraulic pump (4) into the second inner cavity (72) and simultaneously guiding the hydraulic oil in the first inner cavity (71) back into the oil tank (1) when injection molding starts;
the servo solenoid valve (6) includes: a first working oil port (61) communicated with the first inner cavity (71), a second working oil port (62) connected with the second inner cavity (72), an oil inlet (63) connected with an oil outlet of the hydraulic pump (4) and an oil outlet (64) connected with the oil tank (1),
the servo electromagnetic valve (6) is used for conducting the oil inlet (63) and the second working oil port (62) when injection molding starts, and simultaneously conducting the first working oil port (61) and the oil outlet (64);
the oil return electromagnetic valve (5) is a two-position two-way electromagnetic valve.
2. The system according to claim 1, characterized in that the servo solenoid valve (6) is a two-position four-way solenoid valve or a three-position four-way solenoid valve.
3. The system according to claim 1, characterized in that the hydraulic pump (4) is a one-way fixed-displacement hydraulic pump.
4. A system according to any one of claims 1-3, further comprising: a filter (2) connected between the hydraulic pump (4) and the tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162099.0A CN108215108B (en) | 2016-12-15 | 2016-12-15 | Quick response servo control system of injection molding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162099.0A CN108215108B (en) | 2016-12-15 | 2016-12-15 | Quick response servo control system of injection molding machine |
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| CN108215108A CN108215108A (en) | 2018-06-29 |
| CN108215108B true CN108215108B (en) | 2024-02-27 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08127053A (en) * | 1994-10-31 | 1996-05-21 | Toshiba Mach Co Ltd | Injection device of injection molding machine |
| CN2562958Y (en) * | 2002-09-02 | 2003-07-30 | 宁波海天股份有限公司 | Pre-molding, injection hydraulic loop of injection molding machine |
| JP2009012259A (en) * | 2007-07-03 | 2009-01-22 | Nissei Plastics Ind Co | Hydraulic drive method and apparatus for injection molding machine |
| CN101793276A (en) * | 2010-02-08 | 2010-08-04 | 上海汇益控制系统股份有限公司 | Electrohydraulic servo system for two-way high-speed switch |
| CN201684804U (en) * | 2010-01-21 | 2010-12-29 | 上海埃锡尔数控机床有限公司 | Servo control system for plate bending machine |
| CN103660218A (en) * | 2013-12-04 | 2014-03-26 | 稻朗（上海）电塑科技有限公司 | A servo driving system of an injection moulding machine |
| CN104948538A (en) * | 2015-06-03 | 2015-09-30 | 福建工程学院 | Plate bending machine servo hydraulic system and construction method thereof |
-
2016
- 2016-12-15 CN CN201611162099.0A patent/CN108215108B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08127053A (en) * | 1994-10-31 | 1996-05-21 | Toshiba Mach Co Ltd | Injection device of injection molding machine |
| CN2562958Y (en) * | 2002-09-02 | 2003-07-30 | 宁波海天股份有限公司 | Pre-molding, injection hydraulic loop of injection molding machine |
| JP2009012259A (en) * | 2007-07-03 | 2009-01-22 | Nissei Plastics Ind Co | Hydraulic drive method and apparatus for injection molding machine |
| CN201684804U (en) * | 2010-01-21 | 2010-12-29 | 上海埃锡尔数控机床有限公司 | Servo control system for plate bending machine |
| CN101793276A (en) * | 2010-02-08 | 2010-08-04 | 上海汇益控制系统股份有限公司 | Electrohydraulic servo system for two-way high-speed switch |
| CN103660218A (en) * | 2013-12-04 | 2014-03-26 | 稻朗（上海）电塑科技有限公司 | A servo driving system of an injection moulding machine |
| CN104948538A (en) * | 2015-06-03 | 2015-09-30 | 福建工程学院 | Plate bending machine servo hydraulic system and construction method thereof |
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| CN108215108A (en) | 2018-06-29 |
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