CN211891837U - Multiple mode locking hydraulic oil circuit structure of injection molding machine - Google Patents
Multiple mode locking hydraulic oil circuit structure of injection molding machine Download PDFInfo
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- CN211891837U CN211891837U CN201922441601.7U CN201922441601U CN211891837U CN 211891837 U CN211891837 U CN 211891837U CN 201922441601 U CN201922441601 U CN 201922441601U CN 211891837 U CN211891837 U CN 211891837U
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Abstract
The utility model discloses a multiple mode locking hydraulic oil circuit structure of an injection molding machine, which comprises an oil tank, a first oil pump, a main oil circuit oil pump, a servo motor and a mode locking high-pressure oil cylinder; a first control valve and a second control valve are arranged between oil pumps and a connecting oil path of the mold locking high-pressure oil cylinder, a third control valve is arranged between a main oil path oil pump and a connecting oil path of the mold locking high-pressure oil cylinder, and the main oil path oil pump is communicated with the third control valve, the first control valve, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil path channel; and a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve and a regulating valve, and the first oil return channel is sequentially communicated with the fourth control valve, the regulating valve and an oil tank. Through the arrangement of a plurality of oil path channels and the control of a series of hydraulic oil valves, pressure oil can be effectively conveyed to each mold locking oil cylinder, so that the mold locking force is controlled.
Description
Technical Field
The utility model belongs to the hydraulic pressure oil circuit structure field of injection molding machine especially relates to the hydraulic pressure oil circuit structure of mould locking many times of injection molding machine.
Background
In hydraulic injection molding machine molding equipment, a mold moving oil cylinder pulls a mold plate to enable two half molds to be attached, then a movable mold plate is fixed on four pull rods through a mechanical device, and then high-pressure hydraulic oil is controlled by a hydraulic system to seal a mold locking cavity, so that a certain mold locking force is generated; the injection mechanism then injects the material into the mold and then continues to maintain a pressure for a period of time until the product is cooled and formed.
However, the conventional injection molding machine has three disadvantages: 1) the process of generating the locking force by compressing the hydraulic oil in the locking cavity is divided into two stages, firstly, in a low-pressure area, a plurality of pumps all participate in working to quickly supplement the hydraulic oil in the locking cavity; secondly, in a high-pressure area, a high-pressure pump with large displacement is used for generating the mode locking high pressure; however, the inertia of the large-displacement pump is large, so that the pressure cannot be stably increased at high pressure, and the pressure overshoot reaches over 10bar, which has great influence on the service life of the clamping mechanism; 2) in the whole glue injection and pressure maintaining process, the mold locking force generated by the mold locking mechanism is unchanged, when the glue injection starting section is adopted, the injection mold is greatly deformed, the exhaust channel is extruded and narrowed, so that the exhaust in the cavity is influenced, if the air in the cavity cannot be exhausted in time, the air gradually permeates into the product in the injection molding process, and the mechanical property of the product is influenced; 3) the glue injection generally adopts a point glue feeding pressure maintaining mode, the stress of a glue feeding port is very high, the peripheral stress is very low, the warping phenomenon easily occurs, and the problem is more prominent for planar plastic parts.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a multi-time mold locking hydraulic oil circuit structure of an injection molding machine, which comprises an oil tank for storing hydraulic oil, a first oil pump and a main oil circuit oil pump for conveying the hydraulic oil, a servo motor for providing power for the oil pump, and a mold locking high-pressure oil cylinder which is communicated with the oil pump and is used for driving a mold to open and close; a first control valve for controlling the on-off of the first oil pump and a second control valve for controlling the conduction of hydraulic oil on the mode locking high-pressure oil cylinder are arranged between the oil pump and a connecting oil way of the mode locking high-pressure oil cylinder, and the oil pump, the first control valve, the second control valve and the mode locking high-pressure oil cylinder are sequentially connected to form a first oil way channel; a third control valve for controlling the on-off of the main oil way oil pump is arranged between the main oil way oil pump and a connecting oil way of the mold locking high-pressure oil cylinder, and the main oil way oil pump is communicated with the third control valve, the first control valve, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil way channel; and a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve for controlling the on-off of the first oil return channel and a regulating valve for controlling the pressure of the first oil return channel, and the first oil return channel is sequentially communicated with the fourth control valve, the regulating valve and an oil tank. Through the arrangement of a plurality of oil path channels and the control of a series of hydraulic oil valves, pressure oil can be effectively conveyed to each mold locking oil cylinder, so that the mold locking force is controlled. The pressure impact of high-pressure mold locking is eliminated, the service life of parts of the mold locking mechanism is prolonged, and meanwhile, the disappearance of air lines and shrinkage cavities in the produced product and the reduction of internal stress after molding are ensured without warping. The mechanical property and the quality of the product are improved.
The purpose of the utility model is realized by adopting the following technical scheme:
the multi-mode locking hydraulic oil circuit structure of the injection molding machine comprises an oil tank for storing hydraulic oil, a first oil pump and a main oil circuit oil pump for conveying the hydraulic oil, a servo motor for providing power for the first oil pump and the main oil circuit oil pump, and a mode locking high-pressure oil cylinder which is communicated with the oil pump and is used for driving a mold to open and close the mold;
a first control valve for controlling the on-off of the first oil pump and a second control valve for controlling hydraulic oil to conduct the mode locking high-pressure oil cylinder are arranged between the oil pump and a connecting oil path of the mode locking high-pressure oil cylinder, and the oil pump, the first control valve, the second control valve and the mode locking high-pressure oil cylinder are sequentially connected to form a first oil path channel;
a third control valve for controlling the on-off of the main oil way oil pump is arranged between the main oil way oil pump and a connecting oil way of the mold locking high-pressure oil cylinder, and the main oil way oil pump is communicated with the third control valve, the first control valve, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil way channel
And a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve for controlling the on-off of the first oil return channel and a regulating valve for controlling the pressure of the first oil return channel, and the first oil return channel is sequentially communicated with the fourth control valve, the regulating valve and an oil tank.
Further, the regulating valve is any one of a pressure regulating valve, an overflow valve, a one-way throttle valve and a proportional valve.
And furthermore, a pressure sensor for detecting the pressure of the oil way is also arranged between the second control valve and the oil way for connecting the mold locking high-pressure oil cylinder.
Furthermore, the multiple-mode-locking hydraulic oil path structure of the injection molding machine is further provided with a pressure release valve for automatically releasing pressure of the first oil path channel, and the oil pump is communicated with the pressure release valve to form a second oil return channel.
Furthermore, the multiple-mode-locking hydraulic oil path structure of the injection molding machine is also provided with a safety valve for automatically releasing pressure of the first oil path channel, and the oil pump is communicated with the safety valve to form a third oil return channel.
Further, the second oil passage is also provided with a control shuttle valve for enhancing the cut-off effect of the third control valve.
Further, a first check valve is further arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder.
Furthermore, a second one-way valve is arranged at the front end of the fourth control valve of the first oil return channel.
Further, a filter for filtering hydraulic oil is arranged between the oil tank and the oil pump.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a multiple mode locking hydraulic oil circuit structure of an injection molding machine, which comprises an oil tank for storing hydraulic oil, a first oil pump and a main oil circuit oil pump for conveying the hydraulic oil, a servo motor for providing power for the oil pump, and a mode locking high-pressure oil cylinder which is communicated with the oil pump and is used for driving a mold to open and close the mold; a first control valve for controlling the on-off of the first oil pump and a second control valve for controlling the conduction of hydraulic oil on the mode locking high-pressure oil cylinder are arranged between the oil pump and a connecting oil way of the mode locking high-pressure oil cylinder, and the oil pump, the first control valve, the second control valve and the mode locking high-pressure oil cylinder are sequentially connected to form a first oil way channel; a third control valve for controlling the on-off of the main oil way oil pump is arranged between the main oil way oil pump and a connecting oil way of the mold locking high-pressure oil cylinder, and the main oil way oil pump is communicated with the third control valve, the first control valve, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil way channel; and a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve for controlling the on-off of the first oil return channel and a regulating valve for controlling the pressure of the first oil return channel, and the first oil return channel is sequentially communicated with the fourth control valve, the regulating valve and an oil tank. Through the arrangement of a plurality of oil path channels and the control of a series of hydraulic oil valves, pressure oil can be effectively conveyed to each mold locking oil cylinder, so that the mold locking force is controlled. The scheme has the advantages that:
1. the pressure impact of the high-pressure mold locking is eliminated, and the service life of parts of the mold locking mechanism is prolonged;
2. the air lines and shrinkage cavities in the product disappear, and the mechanical property of the product is improved.
3. The internal stress is reduced after molding, the warping condition is avoided, and the product quality is improved.
Drawings
FIG. 1 is a hydraulic schematic diagram of a preferred embodiment of a multiple mold locking hydraulic oil path structure of an injection molding machine according to the present invention;
FIG. 2 is a schematic structural view of a preferred embodiment of the servo motor oil pump assembly of the present invention;
FIG. 3 is a schematic structural view of a preferred embodiment of a second control oil path control valve according to the present invention;
FIG. 4 is a schematic structural diagram of a preferred embodiment of a first oil return passage control valve according to the present invention;
fig. 5 is an electrical control schematic diagram of a preferred embodiment of the present invention.
In the figure: 1. a first control valve; 2. a pressure relief valve; 3. a safety valve; 5. a servo motor; 6. a first oil pump; 9. a third control valve; 10. a control shuttle valve; 11. a fourth control valve; 13. and adjusting the valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
The multiple mold locking hydraulic oil path structure of the injection molding machine of the utility model is shown in figures 1-5, and comprises an oil tank for storing hydraulic oil, a first oil pump 6 and a main oil path oil pump for conveying hydraulic oil, a servo motor 5 for providing power for the oil pump, and a mold locking high-pressure oil cylinder which is communicated with the oil pump and is used for driving a mold to open and close the mold;
a first control valve 1 for controlling the on-off of the first oil pump 6 and a second control valve for controlling the conduction of hydraulic oil to the mold locking high-pressure oil cylinder are arranged between the oil pump and a connecting oil path of the mold locking high-pressure oil cylinder, and the oil pump, the first control valve 1, the second control valve and the mold locking high-pressure oil cylinder are sequentially connected to form a first oil path channel;
a third control valve 9 for controlling the on-off of the main oil way oil pump is arranged between the main oil way oil pump and a connecting oil way of the mold locking high-pressure oil cylinder, and the main oil way oil pump is communicated with the third control valve 9, the first control valve 1, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil way channel;
and a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve 11 for controlling the on-off of the first oil return channel and a regulating valve 13 for controlling the pressure of the first oil return channel, and the first oil return channel is sequentially communicated with the fourth control valve 11, the regulating valve 13 and an oil tank.
Through the arrangement of the oil passage and the control of a series of hydraulic oil valves, pressure oil can be effectively conveyed to each mold locking oil cylinder, so that the mold locking force is controlled. The pressure impact of high-pressure mold locking is eliminated, the service life of parts of the mold locking mechanism is prolonged, and meanwhile, the disappearance of air lines and shrinkage cavities in the produced product and the reduction of internal stress after molding are ensured without warping. The mechanical property and the quality of the product are improved.
The repeated mode locking structure for the injection molding machine is further provided with a pressure release valve 2 used for automatically releasing pressure for the first oil passage, and the oil pump is communicated with the pressure release valve 2 and forms a second oil return passage. The Relief Valve 2(Relief Valve), also called Relief Valve, is an automatic pressure Relief device driven by static pressure of medium in front of the Valve. It opens proportionally as the pressure increases above the opening force. Mainly used for fluid occasions.
The repeated mold locking structure for the injection molding machine is further provided with a safety valve 3 used for automatically releasing pressure of the first oil path channel, and the oil pump is communicated with the safety valve 3 to form a third oil return channel. Safety Valve 3(Safety Valve) an automatic pressure relief device driven by the static pressure of the medium before the Valve. It is characterized by a fully open action with a pop-up. For gas or steam applications. Through the setting of two valve bodies of relief valve 2 and relief valve 3, can guarantee the security of first oil circuit passageway.
After the die assembly action is finished, only small force is needed for keeping the pressing die, the pressure of the oil pump does not need to be too high, the too high pressure can generate certain inertia, and meanwhile, certain service life loss is caused to the die locking high-pressure oil cylinder. The first oil return channel is designed according to the scheme, the first oil return channel is arranged between the second control valve and the communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve 11 used for controlling the on-off of the first oil return channel and a regulating valve 13 used for controlling the pressure of the first oil return channel, and the first oil return channel is communicated with the fourth control valve 11, the regulating valve 13 and the oil tank in sequence. Correspondingly, in this embodiment, a pressure sensor for detecting the pressure of the oil passage is further disposed between the second control valve and the oil passage for connecting the mold locking high-pressure oil cylinder. But the pressure of hydraulic oil in the real-time supervision oil circuit through pressure sensor's detection, when the pressure of hydraulic oil was too big, the first oil return of fourth control valve 11 control was led to and is opened, switches on partly hydraulic oil and returns the oil tank, and according to the degree of pressure size, the flow that hydraulic oil was led to the first oil return of accessible allotment governing valve 13 simultaneously reaches the effect that keeps the pressure of mode locking hydro-cylinder invariable.
Preferably, in this embodiment, the regulating valve 13 is any one of a pressure regulating valve, an overflow valve, a one-way throttle valve and a proportional valve. Of course, other valves for adjusting may be used, which is not limited herein.
In this embodiment, the second oil path is further provided with a control shuttle valve 10 for enhancing the cutting-off effect of the third control valve 9, the cutting-off effect of the third control valve 9 is enhanced through the control shuttle valve 10, it is ensured that the main oil path pump does not work in the high-pressure mode locking state and in the multiple mode locking processes, the second oil path is cut off, and the whole oil path structure is only provided with the first oil pump 6 for supplying oil to the mode-locking high-pressure oil cylinder.
And a first check valve is arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder in order to prevent the backflow of the hydraulic oil. And a second one-way valve is arranged at the front end of the fourth control valve 11 of the first oil return channel. The operation of the hydraulic oil circuit is smooth.
In this embodiment, a filter for filtering hydraulic oil is disposed between the oil tank and the oil pump. Can make the dregs in the hydraulic oil filtered through the filter setting, can not make dregs get into the oil pump, harm the oil pump.
Wherein the multiple mold locking step of the multiple mold locking hydraulic oil path structure of the injection molding machine comprises
Under the low-pressure state: and starting the servo motor 5, opening the first control valve 1 and the third control valve 9, enabling the first oil pump 6 and the main oil way oil pump to supply oil to the mold locking high-pressure oil cylinder, and closing the mold at the moment.
Under high pressure: and the conduction of the first control valve 1 is ensured, the third control valve 9 is controlled to cut off the second oil path, and the oil is supplied to the mold locking high-pressure oil cylinder only by the first oil pump 6.
And (3) multiple mode locking: and the conduction of the first control valve 1 is ensured, the third control valve 9 is controlled to cut off the second oil path channel, the oil is supplied to the mode locking high-pressure oil cylinder only by the first oil pump 6, at the moment, when the pressure sensor detects that the pressure value is greater than a set first pressure value, the fourth control valve 11 is opened, the first oil return channel is conducted, and part of hydraulic oil flows back to the oil tank again through the proportional adjustment of the regulating valve 13.
This patent is to three shortcomings of ordinary hydraulic pressure injection molding machine, specifically:
aiming at the first defect, the process of generating the locking force by compressing the hydraulic oil in the locking cavity is divided into two stages, firstly, in a low-pressure state, a main oil way pump and a first oil pump 6 both participate in working to quickly supplement the hydraulic oil in the locking cavity; secondly, in a high-pressure state, only the first oil pump 6 is adopted to generate the mode locking high pressure; however, since the first oil pump 6 belongs to a small displacement pump, its inertia is relatively small; on the control panel of the driver, the parameters of the oil pressure PID are changed, and compared with a large-displacement pump, the pressure can be stably increased, the pressure overshoot can be controlled within 2bar, and the service life of the clamping mechanism is prolonged.
To the second shortcoming, injection molding machine clamping mechanism leans on the oil pressure to close the mould after, the die cavity is whole to be the air, because at the initial stage of penetrating gluey, the plastics melt is when not filling up the die cavity, can't provide pressure for the mould inner wall, in order to guarantee that the shape of exhaust duct can not smooth and easy exhaust, the clamping force as long as guarantee not leak the material just can, along with the plastics melt fills up the die cavity gradually and can provide pressure for the mould inner wall gradually, the clamping force also needs to increase gradually, prevent the defect of the inside gas line of plastic product and shrinkage cavity, guarantee the normal shaping of product.
Aiming at the third defect, on the basis of adopting a multi-point glue feeding mode, after multi-section glue injection and pressure maintaining are carried out, high-pressure oil is kept in a mold locking oil cylinder while glue melting is carried out, and a formed product is continuously extruded through a template and a mold so as to resist the internal stress of the product caused by temperature change.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (9)
1. The hydraulic oil circuit structure for multiple mold locking of an injection molding machine is characterized in that: the mould locking device comprises an oil tank for storing hydraulic oil, a first oil pump and a main oil way oil pump for conveying the hydraulic oil, a servo motor for providing power for the first oil pump and the main oil way oil pump, and a mould locking high-pressure oil cylinder which is communicated with the oil pumps and is used for driving a mould to open and close;
a first control valve for controlling the on-off of the first oil pump and a second control valve for controlling hydraulic oil to conduct the mode locking high-pressure oil cylinder are arranged between the oil pump and a connecting oil path of the mode locking high-pressure oil cylinder, and the oil pump, the first control valve, the second control valve and the mode locking high-pressure oil cylinder are sequentially connected to form a first oil path channel;
a third control valve for controlling the on-off of the main oil way oil pump is arranged between the main oil way oil pump and a connecting oil way of the mold locking high-pressure oil cylinder, and the main oil way oil pump is communicated with the third control valve, the first control valve, the second control valve and the mold locking high-pressure oil cylinder in sequence to form a second oil way channel;
and a first oil return channel is also arranged between the second control valve and a communication oil way of the mold locking high-pressure oil cylinder, the first oil return channel comprises a fourth control valve for controlling the on-off of the first oil return channel and a regulating valve for controlling the pressure of the first oil return channel, and the first oil return channel is sequentially communicated with the fourth control valve, the regulating valve and an oil tank.
2. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: the regulating valve is any one of a pressure regulating valve, an overflow valve, a one-way throttle valve and a proportional valve.
3. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: and a pressure sensor for detecting the pressure of the oil way is also arranged between the second control valve and the oil way for connecting the mold locking high-pressure oil cylinder.
4. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: the multiple-locking hydraulic oil circuit structure of the injection molding machine is further provided with a pressure release valve used for automatically releasing pressure for the first oil circuit channel, and the oil pump is communicated with the pressure release valve and forms a second oil return channel.
5. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: the multiple-mode-locking hydraulic oil way structure of the injection molding machine is further provided with a safety valve used for automatically relieving pressure of the first oil way channel, and the oil pump is communicated with the safety valve to form a third oil return channel.
6. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: and the second oil path passage is also provided with a control shuttle valve for enhancing the cutting-off effect of the third control valve.
7. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: and a first check valve is also arranged between the second control valve and a communicating oil way of the mold locking high-pressure oil cylinder.
8. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: and a second one-way valve is arranged at the front end of the fourth control valve of the first oil return channel.
9. The multiple-mold-locking hydraulic oil path structure of an injection molding machine according to claim 1, characterized in that: and a filter for filtering hydraulic oil is arranged between the oil tank and the oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441601.7U CN211891837U (en) | 2019-12-30 | 2019-12-30 | Multiple mode locking hydraulic oil circuit structure of injection molding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922441601.7U CN211891837U (en) | 2019-12-30 | 2019-12-30 | Multiple mode locking hydraulic oil circuit structure of injection molding machine |
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| CN211891837U true CN211891837U (en) | 2020-11-10 |
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| CN201922441601.7U Active CN211891837U (en) | 2019-12-30 | 2019-12-30 | Multiple mode locking hydraulic oil circuit structure of injection molding machine |
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