CN114228084A - Dynamic accurate control hydraulic circuit for mold locking force of injection molding machine - Google Patents
Dynamic accurate control hydraulic circuit for mold locking force of injection molding machine Download PDFInfo
- Publication number
- CN114228084A CN114228084A CN202111434263.XA CN202111434263A CN114228084A CN 114228084 A CN114228084 A CN 114228084A CN 202111434263 A CN202111434263 A CN 202111434263A CN 114228084 A CN114228084 A CN 114228084A
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- Prior art keywords
- oil cylinder
- mold locking
- injection molding
- molding machine
- hydraulic circuit
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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
- B29C45/7653—Measuring, controlling or regulating mould clamping forces
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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
- B29C2945/76344—Phase or stage of measurement
- B29C2945/76391—Mould clamping, compression of the cavity
-
- 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
- B29C2945/76451—Measurement means
- B29C2945/76484—Fluid type
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of injection molding machines, and provides a hydraulic loop for dynamically and accurately controlling a mold locking force of an injection molding machine. The mold locking oil cylinder is used for outputting mold locking force; the proportional overflow valve is connected with the mold locking oil cylinder and is used for controlling the mold locking force; and the independent power assembly is used for providing power for the mold locking oil cylinder. The proportional overflow valve receives a certain current value, different current values correspond to different mold locking pressures, and the mold locking pressure generated along with the change of the current of the proportional overflow valve changes along with the change of the current, so that the pressure of the mold locking oil cylinder can be accurately controlled. In addition, the mode locking pressure can be provided by the independent power assembly, and when the mode locking oil cylinder is required to be dynamically controlled for many times, the independent power assembly provides the mode locking pressure for the mode locking oil cylinder, so that the mode locking pressure is controlled more accurately and efficiently.
Description
Technical Field
The invention belongs to the technical field of injection molding machines, and particularly relates to a hydraulic loop for dynamically and accurately controlling a mold clamping force of an injection molding machine.
Background
An injection molding machine, also known as an injection molding machine or an injection machine, is a main molding device for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by utilizing a plastic molding die, and a mold locking hydraulic circuit is an important component in the injection molding machine and provides enough pretightening force for the die in molding. But present injection molding machine can only accomplish once mode locking force control to mode locking force all can have the overshoot phenomenon because the oil circuit strikes, and along with the extension of mode locking force pressure holding time, the normal leakage of control case and disk seat, the mode locking force all can appear reducing the phenomenon, so can not satisfy the injection molding machine and carry out the accurate dynamic control of mode locking force.
In summary, in the prior art of the injection molding machine, there is a technical problem that the injection molding machine cannot accurately and dynamically control the mold clamping force.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hydraulic loop for dynamically and accurately controlling the mold clamping force of an injection molding machine, which comprises a mold clamping oil cylinder, a proportional overflow valve and an independent power assembly.
And the mold locking oil cylinder is used for outputting mold locking force.
And the proportional overflow valve is connected with the mold locking oil cylinder and is used for controlling the mold locking force.
And the independent power assembly is used for providing power for the mold locking oil cylinder.
Preferably, the independent power assembly comprises an oil pump and a motor, and the motor provides power for the oil pump.
Preferably, the injection molding machine clamping force dynamic accurate control hydraulic circuit further comprises a one-way valve and a first pipeline, wherein the one-way valve is arranged in the first pipeline, one end of the one-way valve is connected with the clamping oil cylinder, and the other end of the one-way valve is connected with the independent power assembly.
Preferably, the hydraulic circuit for dynamically and accurately controlling the mold clamping force of the injection molding machine further comprises an electromagnetic directional valve, and the electromagnetic directional valve is connected with the proportional overflow valve.
Preferably, the electromagnetic directional valve is a cartridge electromagnetic directional valve.
Preferably, the dynamic accurate control hydraulic circuit for the mold locking force of the injection molding machine further comprises a second pipeline, wherein one end of the second pipeline is connected with the mold locking oil cylinder, and the other end of the second pipeline is connected with the oil pump.
Preferably, the dynamic accurate control hydraulic circuit for the mold locking force of the injection molding machine further comprises a safety overflow valve, and the safety overflow valve is arranged between the mold locking oil cylinder and the independent power assembly.
Preferably, the injection molding machine clamping force dynamic accurate control hydraulic circuit further comprises an oil suction filter, and the oil suction filter is connected with the oil pump.
Preferably, the hydraulic circuit for dynamically and accurately controlling the mold locking force of the injection molding machine further comprises an electromagnetic reversing valve, and the electromagnetic reversing valve is arranged between the mold locking oil cylinder and the independent power assembly.
Preferably, the electromagnetic directional valve is a two-position four-way valve.
Compared with the prior art, the invention has the beneficial effects that:
1. a hydraulic loop for dynamically and accurately controlling the mold clamping force of an injection molding machine comprises a mold clamping oil cylinder, a proportional overflow valve and an independent power assembly. The mold locking oil cylinder is used for outputting mold locking force; the proportional overflow valve is connected with the mold locking oil cylinder and is used for controlling the mold locking force; and the independent power assembly is used for providing power for the mold locking oil cylinder. The proportional overflow valve receives a certain current value, different current values correspond to different mold locking pressures, and the mold locking pressure generated along with the change of the current of the proportional overflow valve changes along with the change of the current, so that the pressure of the mold locking oil cylinder can be accurately controlled. In addition, the mode locking pressure can be provided by an independent power assembly, and when the mode locking pressure is required to be dynamically controlled for many times, the independent power assembly provides the mode locking pressure for the mode locking oil cylinder, so that the pressure control is more accurate and efficient.
2. Set up motor and oil pump and provide the power supply for the mode locking hydro-cylinder, guarantee that the proportional relief valve has sufficient oil mass to carry out long-term pressure control. The pressure control can play a certain role in lubrication and heat exchange for the oil pump and the mold locking oil cylinder in an overflow mode of the proportional overflow valve, and long-time pressure maintenance can be realized.
Drawings
FIG. 1 is a schematic diagram of a hydraulic circuit of a conventional injection molding machine;
fig. 2 is a schematic diagram of a hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to the present invention.
Illustration of the drawings:
10. a mold locking oil cylinder;
20. a proportional relief valve;
30. an independent power assembly; 31. an oil pump; 32. a motor; 33. an oil absorption filter;
40. a one-way valve;
50. a first conduit;
60. an electromagnetic directional valve;
70. a safety overflow valve;
80. an electromagnetic directional valve;
90. a second conduit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described later can be combined with each other as long as they do not conflict with each other.
Referring to fig. 2, the invention provides a hydraulic circuit for dynamically and accurately controlling mold clamping force of an injection molding machine, which comprises a mold clamping oil cylinder 10, a proportional overflow valve 20 and an independent power assembly 30.
The mold locking oil cylinder 10 is used for outputting mold locking force, the proportional overflow valve 20 is connected with the mold locking oil cylinder 10 and used for controlling the mold locking force, and the independent power assembly 30 is used for providing power for the mold locking oil cylinder 10. The proportional overflow valve 20 directly generates thrust by an electromagnet, the thrust is acted on a valve core, the input voltage on the electromagnet can be changed between 0-24V, and the generated thrust is changed along with the change of the input voltage, so that continuously changed hydraulic pressure is obtained.
In the design, the proportional overflow valve 20 receives a certain current value, different current values correspond to different mold locking pressures, and the mold locking force generated along with the change of the current of the proportional overflow valve 20 changes along with the change of the current, so that the pressure of the mold locking oil cylinder 10 can be accurately controlled. In addition, the mold locking force can be provided by the independent power assembly 30, and when multiple times of dynamic control are needed, the independent power assembly 30 can provide the mold locking pressure for the mold locking oil cylinder 10, so that the pressure control is more accurate and efficient.
In one embodiment, referring to fig. 2, the independent power assembly 30 includes an oil pump 31 and a motor 32, and the motor 32 powers the oil pump 31. The motor 32 can be a three-phase asynchronous motor, which has a simple structure, is sturdy and durable, runs reliably, and has high running efficiency. The oil pump 31 can adopt a gear pump, and the motor 32 and the oil pump 31 can provide a power source for the mode locking oil cylinder 10, so that the proportional overflow valve 20 is ensured to have sufficient oil to perform long-term pressure control. The pressure control can play a certain role in lubrication and heat exchange for the oil pump 31 and the mold locking oil cylinder 10 in an overflow mode of the proportional overflow valve 20, and can realize long-time pressure maintenance.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and accurately controlling mold clamping force of an injection molding machine further includes a check valve 40 and a first pipeline 50, the check valve 40 is disposed in the first pipeline 50, one end of the check valve 40 is connected to the mold clamping cylinder 10, and the other end is connected to the independent power assembly 30. One, two or more than two check valves 40 and mold locking cylinders 10 can be arranged, and when four check valves 40 and four mold locking cylinders 10 are arranged, each check valve 40 is arranged corresponding to each mold locking cylinder 10 one by one. The first pipeline 50 is used as an independent pipeline, is connected with each mode locking oil cylinder 10 through each check valve 40, and is not communicated with the main oil way of each mode locking oil cylinder 10, so that mutual influence is avoided, the main oil of each mode locking oil cylinder 10 and the independent oil of the first pipeline 50 can be guaranteed to jointly act on each mode locking oil cylinder 10, and a hydraulic circuit is more reliable and safer.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and precisely controlling the mold clamping force of the injection molding machine further comprises a solenoid directional valve 60, and the solenoid directional valve 60 is connected with the proportional relief valve 20. Further, the solenoid directional valve 60 may be a cartridge-type solenoid directional valve 60. The use of a cartridge electromagnetic directional valve 60 facilitates installation.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and precisely controlling mold clamping force of an injection molding machine further includes a second pipeline 90, one end of the second pipeline 90 is connected to the mold clamping cylinder 10, and the other end is connected to the oil pump 31. The second pipeline 90 is connected with the first pipeline 50, a main oil path of the mold locking oil cylinder 10 is not involved, and power sources can be conveniently provided for the mold locking oil cylinder 10 through the second pipeline 90 and the first pipeline 50, so that mold locking pressure can be accurately controlled.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and precisely controlling mold clamping force of the injection molding machine further includes a safety relief valve 70, and the safety relief valve 70 is disposed between the mold clamping cylinder 10 and the independent power assembly 30. The safety overflow valve 70 is used for safety pressure control, plays a role in safety protection, can adjust the pressure of a hydraulic loop, avoids the situation of overhigh pressure, and ensures that the motor 32 of the oil pump 31 works under a rated working condition.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and precisely controlling the mold clamping force of the injection molding machine further includes an oil suction filter 33, and the oil suction filter 33 is connected to the oil pump 31. The filter can be arranged on a suction pipeline of the oil pump 31, filters out residual pollutants in an oil tank of the oil pump 31, effectively controls the hydraulic circuit to be free from pollution, improves the cleanliness of the hydraulic circuit, and further has a protection effect on the oil pump 31.
In one embodiment, referring to fig. 2, the hydraulic circuit for dynamically and precisely controlling mold clamping force of the injection molding machine may further include a solenoid directional valve 80, and the solenoid directional valve 80 is disposed between the mold clamping cylinder 10 and the independent power assembly 30. Further, the electromagnetic directional valve 80 may be a two-position four-way valve. The two-position four-way valve is adopted to control the output direction of the independent power assembly 30, pressure relief can be performed in a normal state, and the oil pump 31 is protected and energy is saved.
The working principle is as follows:
when the oil pump 31 is started, the three-phase asynchronous motor of the independent power assembly 30 is correspondingly started, the electromagnetic directional valve 80 is not powered in a normal state, the oil pump 31 of the independent power assembly 30 is in a standby state of a zero-pressure oil return tank, the safety overflow valve 70 is set to be at the maximum mold locking pressure, the motor 32 is ensured not to be overloaded, and the oil pump 31 is within the rated working pressure range. When the mold locking oil cylinder 10 needs pressure dynamic control for many times, the electromagnetic directional valve 80 and the electromagnetic directional valve 60 are powered, meanwhile, the proportional overflow valve 20 receives a certain current value, different current values correspond to different mold locking pressures, power output by the independent power assembly 30 enters the four mold locking oil cylinders 10 for starting mold locking force through the first pipeline 50, the second pipeline 90 and the check valves 40, and the proportional overflow valve 20 accurately controls the pressure of the four mold locking oil cylinders 10 in an overflow mode.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides an injection molding machine clamping force developments accurate control hydraulic circuit which characterized in that includes:
the mold locking oil cylinder is used for outputting mold locking force;
the proportional overflow valve is connected with the mold locking oil cylinder and is used for controlling the mold locking force;
and the independent power assembly is used for providing power for the mold locking oil cylinder.
2. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the independent power assembly comprises an oil pump and a motor, and the motor provides power for the oil pump.
3. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the mould locking oil cylinder is connected with the mould locking oil cylinder, and the other end of the mould locking oil cylinder is connected with the independent power assembly.
4. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the electromagnetic directional valve is connected with the proportional overflow valve.
5. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 4, wherein: the electromagnetic directional valve is a plug-in type electromagnetic directional valve.
6. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the mold locking device comprises a second pipeline, wherein one end of the second pipeline is connected with the mold locking oil cylinder, and the other end of the second pipeline is connected with the independent power assembly.
7. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the mould locking oil cylinder is arranged between the mould locking oil cylinder and the independent power assembly.
8. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 2, wherein: the oil absorption filter is connected with the oil pump.
9. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 1, wherein: the mold locking device comprises an electromagnetic reversing valve, wherein the electromagnetic reversing valve is arranged between the mold locking oil cylinder and the independent power assembly.
10. The hydraulic circuit for dynamically and accurately controlling the clamping force of an injection molding machine according to claim 9, wherein: the electromagnetic directional valve is a two-position four-way valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410174809.XA CN117921968A (en) | 2021-11-29 | 2021-11-29 | Hydraulic circuit and method for dynamically and accurately controlling mold locking force of injection molding machine |
| CN202111434263.XA CN114228084A (en) | 2021-11-29 | 2021-11-29 | Dynamic accurate control hydraulic circuit for mold locking force of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111434263.XA CN114228084A (en) | 2021-11-29 | 2021-11-29 | Dynamic accurate control hydraulic circuit for mold locking force of injection molding machine |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410174809.XA Division CN117921968A (en) | 2021-11-29 | 2021-11-29 | Hydraulic circuit and method for dynamically and accurately controlling mold locking force of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114228084A true CN114228084A (en) | 2022-03-25 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410174809.XA Pending CN117921968A (en) | 2021-11-29 | 2021-11-29 | Hydraulic circuit and method for dynamically and accurately controlling mold locking force of injection molding machine |
| CN202111434263.XA Pending CN114228084A (en) | 2021-11-29 | 2021-11-29 | Dynamic accurate control hydraulic circuit for mold locking force of injection molding machine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410174809.XA Pending CN117921968A (en) | 2021-11-29 | 2021-11-29 | Hydraulic circuit and method for dynamically and accurately controlling mold locking force of injection molding machine |
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| Country | Link |
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| CN (2) | CN117921968A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116353007A (en) * | 2023-03-02 | 2023-06-30 | 博创智能装备股份有限公司 | Intelligent pressure maintaining control method of hydraulic injection molding machine |
-
2021
- 2021-11-29 CN CN202410174809.XA patent/CN117921968A/en active Pending
- 2021-11-29 CN CN202111434263.XA patent/CN114228084A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116353007A (en) * | 2023-03-02 | 2023-06-30 | 博创智能装备股份有限公司 | Intelligent pressure maintaining control method of hydraulic injection molding machine |
| CN116353007B (en) * | 2023-03-02 | 2023-10-20 | 博创智能装备股份有限公司 | Intelligent pressure maintaining control method of hydraulic injection molding machine |
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| Publication number | Publication date |
|---|---|
| CN117921968A (en) | 2024-04-26 |
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