CN113771320A - Differential mode locking pressure relief oil way for two-plate injection molding machine - Google Patents
Differential mode locking pressure relief oil way for two-plate injection molding machine Download PDFInfo
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- CN113771320A CN113771320A CN202110941205.XA CN202110941205A CN113771320A CN 113771320 A CN113771320 A CN 113771320A CN 202110941205 A CN202110941205 A CN 202110941205A CN 113771320 A CN113771320 A CN 113771320A
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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
- 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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
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- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a differential mode locking pressure relief oil way for a two-plate injection molding machine, which comprises a cartridge valve, two-position two-way electromagnetic reversing valves and an oil tank, wherein the cartridge valve is used for filling a pressure relief oil way; a bottom working oil port of the cartridge valve is communicated with the mold locking cavity, and a side working oil port is communicated with the mold breaking cavity to form a main channel oil way; when the mold locking and pressure releasing act, when the electromagnet of the second two-position two-way electromagnetic reversing valve is electrified, the pilot port of the cartridge valve reaches the side working oil port of the cartridge valve through the first damper, the third damper, the fourth damper and the fifth damper, and the bottom working oil port of the cartridge valve reaches the side working oil port of the cartridge valve through the second damper, the fourth damper and the fifth damper, so that the cartridge valve is slowly opened to realize differential mold locking and pressure releasing; when the mold is broken, when the electromagnet of the first two-position two-way electromagnetic reversing valve is electrified, the pilot port of the cartridge valve reaches the oil tank through the first damping, so that the cartridge valve is quickly opened to realize differential mold breaking; the advantage is that mode locking pressure release process is steady, has compromise broken mould action, and the fluid cleanliness is good.
Description
Technical Field
The invention relates to a mold locking and pressure relief technology of an injection molding machine, in particular to a differential mold locking and pressure relief oil way for a two-plate injection molding machine.
Background
In a two-plate injection molding machine, the basic actions are as follows: the method comprises the steps of mold closing, band-type brake, high-pressure mold locking, injection table feeding, injection, pressure maintaining, pre-molding, injection retreating, cooling, mold locking and pressure relief, mold breaking, brake opening, mold opening and mold taking. The mode locking pressure release action is the process of releasing oil in the mode locking cavity of the mode locking oil cylinder from high pressure to low pressure, and is the key action of the two-plate injection molding machine, and because the pressure is released instantly to generate huge energy, the impact can be generated on an oil return area, and the impact can cause vibration and further can generate oil return noise.
In order to solve the problems, the industry personnel provide a mode locking pressure relief oil way. Fig. 1 shows a conventional mold locking pressure relief oil path, which is characterized in that a two-position two-way electromagnetic directional valve V51, a damping joint Z1 and a small-diameter steel pipe (with the diameter of 8mm) are independently connected with a small-flow channel oil return tank in a mold locking cavity 11 of a mold locking oil cylinder 1, the mold locking pressure is slowly reduced to a set pressure (the set pressure is smaller than the mold locking pressure) by using the channel, and then the residual mold locking pressure is directly returned to the oil return tank through a large-flow oil return cartridge valve V59 to realize two-section mold locking pressure relief of the mold locking pressure. When the two-plate injection molding machine is in full-automatic production, the pressure of a mold cavity of a mold is reduced before cooling is finished, the two-plate injection molding machine can ensure that the mold does not expand without too large mold locking pressure, and normal production of a product is ensured, according to actual field production experience, half mold locking pressure after pressure maintaining of the product is finished is enough to ensure normal production of the product, so that a two-position two-way electromagnetic reversing valve V51 is electrified in the process of finishing cooling of the pressure maintaining of the product, oil in a mold locking cavity 11 returns to a tank through a two-position two-way electromagnetic reversing valve V51, the pressure begins to drop, the flow rate of the two-position two-way electromagnetic reversing valve V51 is small, the drift diameter of a steel pipe connected with two ends of the two-position two-way electromagnetic reversing valve V51 is small, and the damping joint Z1 is added, so that the oil flow rate of the whole channel is small, and the pressure drop is controllable; in the process that the oil pressure in the mold locking cavity 11 slowly decreases, the mold locking pressure sensor F10 detects in real time, when the mold locking pressure is detected to reach the set pressure (the set pressure is generally set to be half of the mold locking pressure), the two-position two-way electromagnetic reversing valve V51 loses electricity, at the moment, the mold locking cavity 11 only has half of the mold locking pressure of the current machine, the process is also called early pressure relief, the pressure in the pressure relief process decreases slowly, the action impact is small, the sound is light, and the pressure relief time is long. When the pressure relief action of the rotation locking mold is finished after cooling, an electromagnetic directional valve V62 serving as a switch valve and a two-position two-way electromagnetic directional valve V58 are electrified, oil ways of a port B and a port C of an oil return cartridge valve V59 are cut off when an electromagnetic directional valve V62 serving as the switch valve is electrified, a port C of an oil return cartridge valve V59 is directly communicated with an oil tank when the two-position two-way electromagnetic directional valve V58 is electrified, the port C of the oil return cartridge valve V59 has no pressure, the oil return cartridge valve V59 is opened, and residual oil in the mold locking cavity 11 is relieved to an port A oil return tank through the port B of the oil return cartridge valve V59, so that the pressure relief action of the whole mold locking mold is finished.
The two-section mode locking pressure relief of the mode locking pressure relief oil way has the following problems:
1) in order to slow down the opening speed of the valve core of the oil return cartridge valve V59, a damping Z2 is additionally arranged at the opening C of the oil return cartridge valve V59, and meanwhile, the oil return cartridge valve V59 is provided with a buffer type valve core, because the damping Z2 needs to take into account the mold breaking speed (the smaller the damping Z2 is, the better the damping Z2 is when the mold locking is decompressed, and the larger the damping Z2 is, the better the mold breaking is), the selection of the damping Z2 is not too small, if the damping Z2 is too small, the hole of the damping Z2 is easy to block when the oil is viscous in cold weather, the oil is difficult to flow, and the mold breaking speed is slow or even the mold breaking failure is caused; in addition, the actual measurement effect of the buffer type valve core is very limited, so although the mold locking pressure is reduced in the process, the opening speed of the valve core of the oil return cartridge valve V59 is still high due to large through flow, and the oil impact is still large in the pressure relief process;
2) because two-section mode locking pressure relief is established on the basis of a product process, a lot of uncertainties exist, for example, some product processes require pressure maintaining all the time, some products are injected and pressure maintaining are finished and cooled, the pressure of a lock mold is not reduced too much after the pressure maintaining of some products is finished, and the like, so that the early pressure relief function cannot be used, or the production cycle is occupied after the use, or the sound of secondary pressure relief is still large after the use, and the two-section pressure relief cannot be fully covered and applied;
3) the final large-traffic pressure release in two segmentation mode locking pressure release still directly gets back to the oil tank, lacks the absorption of energy, and the vibration that the impact arouses is still comparatively obvious, and the oil return noise of production is still comparatively obvious, and oil liquid cleanliness is also relatively poor in the oil tank.
Disclosure of Invention
The invention aims to solve the technical problem of providing a differential mode locking and pressure releasing oil way for a two-plate injection molding machine, which has the advantages of stable mode locking and pressure releasing process, small oil impact, low oil return noise, consideration of the mode breaking action, capability of quickly opening a cartridge valve during the mode breaking action, no impact on an oil tank, better oil cleanliness, no influence on other actions during the mode locking and pressure releasing, and capability of comprehensively covering and applying.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a differential type mode locking pressure release oil circuit for two board-like injection molding machines which characterized in that: the electromagnetic directional control valve comprises a cartridge valve with a valve core of 1:1, a first two-position two-way electromagnetic directional valve, a second two-position two-way electromagnetic directional valve and an oil tank; a bottom working oil port of the cartridge valve is communicated with a mold locking cavity of the mold locking oil cylinder, and a side working oil port of the cartridge valve is communicated with a mold breaking cavity of the mold locking oil cylinder to form a main channel oil way; when the electromagnet of the second two-position two-way electromagnetic reversing valve is electrified, a pilot port of the cartridge valve sequentially passes through a first damper, a third damper and a fourth damper, a channel from an oil inlet to an oil return port of the second two-position two-way electromagnetic reversing valve and a side working oil port of the cartridge valve from a fifth damper to form a first pilot control oil path, and a bottom working oil port of the cartridge valve sequentially passes through the second damper and the fourth damper, a channel from an oil inlet to the oil return port of the second two-position two-way electromagnetic reversing valve and a side working oil port of the cartridge valve from the fifth damper to form a second pilot control oil path; when the electromagnet of the first two-position two-way electromagnetic directional valve is electrified, the pilot port of the cartridge valve sequentially passes through the first damper and a passage from the oil inlet to the oil return port of the first two-position two-way electromagnetic directional valve to reach the oil tank to form a third pilot control oil path; when the mold locking and pressure releasing actions are carried out, the cartridge valve is slowly opened by utilizing the first pilot control oil way and the second pilot control oil way, and oil flows to a broken mold cavity of the mold locking oil cylinder from a mold locking cavity of the mold locking oil cylinder to realize differential mold locking and pressure releasing of two cavities of the mold locking oil cylinder; when the mold is broken, the third pilot control oil way is used for quickly opening the cartridge valve, and oil flows to a broken mold cavity of the mold locking oil cylinder from the mold locking cavity of the mold locking oil cylinder to realize differential mold breaking.
The differential mode-locking pressure-relief oil way also comprises a small-flow overflow valve, wherein a pilot port of the cartridge valve is communicated with an oil inlet of the first two-position two-way electromagnetic reversing valve, a first damping is arranged on the communicating pipe close to the pilot port of the cartridge valve, an oil return port of the first two-position two-way electromagnetic reversing valve is communicated with the oil tank, an oil inlet of the overflow valve is communicated with a mode-locking cavity of the mode-locking oil cylinder, an oil outlet of the overflow valve is communicated with an oil inlet of the second two-position two-way electromagnetic reversing valve, an oil return port of the second two-position two-way electromagnetic reversing valve is communicated with a broken cavity of the mode-locking oil cylinder, a fifth damping is arranged on the communicating pipe close to the oil return port of the second two-position two-way electromagnetic reversing valve, a bottom working oil port of the cartridge valve is communicated with an oil outlet of the overflow valve, and the communicating pipe is sequentially provided with the second damping and the fourth damping, the bottom working oil port of the cartridge valve is communicated with the pilot port of the cartridge valve, a third damper is arranged on a communication pipeline, one end of the third damper is located between the first damper and the oil inlet of the first two-position two-way electromagnetic directional valve, and the other end of the third damper is located between the second damper and the fourth damper.
The pressure of the overflow valve is set to 30 bar.
And a mould locking piston in the mould locking oil cylinder, a mould locking cavity of the mould locking oil cylinder and a hose channel of the broken mould cavity are respectively provided with a flexible device. When the mode locking pressure release action, pass through cartridge valve pressure release to broken die cavity with the high pressure oil in the lock die cavity, through mode locking piston and hose passageway buffering, inhale the shake, and then impact and noise when can reducing the mode locking pressure release realize flexible mode locking pressure release.
The pressure difference between the two ends of the first damper is controlled within 30 bar. Through the relation between the pressure difference at the two ends of the damper and the sectional area, the pressure difference at the two ends of the first damper (namely the pressure difference between a pilot port of the cartridge valve, namely a port C, and a point D in the figure 2) can be obtained through a liquid resistance calculation formula, proper sizes are selected for the first damper, the second damper, the third damper, the fourth damper and the fifth damper, the two ends of the first damper can be always maintained at lower pressure difference, and the pressure difference at the two ends of the first damper is preferably controlled within 30bar for considering the speed of mode locking pressure release.
Compared with the prior art, the invention has the advantages that:
1) no matter the electromagnet of the second two-position two-way electromagnetic reversing valve or the electromagnet of the first two-position two-way electromagnetic reversing valve is electrified, or the electromagnet of the first two-position two-way electromagnetic reversing valve and the electromagnet of the second two-position two-way electromagnetic reversing valve are electrified simultaneously, oil flows to the broken die cavity from the die locking cavity, and the oil does not directly return to the oil tank, so that the pressure difference of the two cavities of the die locking oil cylinder is greatly reduced.
2) When the mold locking and pressure releasing action is carried out, the electromagnet of the second two-position two-way electromagnetic reversing valve is electrified, the pilot port of the cartridge valve, namely the port C, enables the two ends of the first damper to always maintain lower pressure difference, the flow rate is lower when the pressure difference between the two ends of the first damper is lower, the opening speed of the valve core of the cartridge valve is slower, and high-pressure oil in the mold locking cavity flows to the mold breaking cavity and cannot be out of control, so that the whole mold locking and pressure releasing process is stable, the oil impact is small, and the oil return noise is low.
3) Meanwhile, the mold breaking action is considered, when the mold breaking action is carried out, the electromagnet of the first two-position two-way electromagnetic reversing valve is electrified, the pilot port, namely the C port, of the cartridge valve passes through the first damping oil return box, only 1 damping, namely the first damping, is passed through, and the flow rate of the first damping is reduced in a mode of reducing pressure difference through damping combination when the mold locking pressure is relieved, so that the selection of the first damping is not required to be small, the flow rate of the pilot control oil path of the cartridge valve is large, the cartridge valve can be quickly opened, oil flows to a breaking mold cavity from a mold locking cavity, and the area of the breaking mold cavity is larger than that of the mold locking cavity because the breaking mold cavity is a rodless cavity, so that the differential mold breaking is realized.
4) Two cavities of the mode locking oil cylinder are in differential pressure relief, and impact to the oil tank is avoided, so that the cleanliness of oil is good.
5) The principle of two-cavity differential pressure relief of the mode locking oil cylinder is more reasonable, other actions are not affected, and the mode locking oil cylinder can be comprehensively applied in a covering mode.
Drawings
FIG. 1 is a schematic diagram of a conventional mold locking pressure relief oil path;
FIG. 2 is a schematic diagram of a differential mode-locking pressure relief oil path according to the present invention;
fig. 3 is a simplified schematic diagram of the hydraulic principle of the first pilot control oil path and the second pilot control oil path in the differential mode-locking pressure relief oil path according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The invention provides a differential mode locking pressure relief oil way for a two-plate injection molding machine, which comprises a cartridge valve V1 with a valve core of 1:1, a first two-position two-way electromagnetic directional valve V2, a second two-position two-way electromagnetic directional valve V3 and an oil tank 20, wherein the first two-position two-way electromagnetic directional valve V2 is connected with the oil tank through a pipeline; a bottom working oil port (port A) of the cartridge valve V1 is communicated with a mold locking cavity 211 of the mold locking oil cylinder 21, and a side working oil port (port B) of the cartridge valve V1 is communicated with a broken mold cavity 212 of the mold locking oil cylinder 21 to form a main channel oil way; when the electromagnet of the second two-position two-way electromagnetic reversing valve V3 is electrified, a pilot port, namely a port C, of the cartridge valve V1 sequentially passes through a passage from a port P to a port T, namely an oil inlet, of the first damping ZN1, a third damping ZN3, a fourth damping ZN4, a passage from the port P to a port T, namely an oil inlet, of the second two-position two-way electromagnetic reversing valve V3, a passage from a port B, namely a side working oil port, of the cartridge valve V1, through the fifth damping ZN5, a bottom working oil port, namely a port A, of the cartridge valve V1 sequentially passes through a passage from the port P, namely the oil inlet, of the second two-position two-way electromagnetic reversing valve V3, the passage from the port P to the port T, and a passage from the fifth damping ZN5 to a side working oil port B, namely the port B, of the cartridge valve V1, so as to form a second pilot control oil passage; when the electromagnet of the first two-position two-way electromagnetic directional valve V2 is electrified, a pilot port, namely a port C, of the cartridge valve V1 sequentially passes through a first damping ZN1 and a passage from an oil inlet, namely a port P, of the first two-position two-way electromagnetic directional valve V2 to an oil return port, namely a port T, and reaches the oil tank 20 to form a third pilot control oil path; when the mold locking pressure relief action is performed, the cartridge valve V1 is slowly opened by using the first pilot control oil path and the second pilot control oil path, and oil flows from the mold locking cavity 211 of the mold locking oil cylinder 21 to the broken mold cavity 212 of the mold locking oil cylinder 21 to realize the differential mold locking pressure relief of the two cavities of the mold locking oil cylinder 21; during the mold breaking operation, the third pilot control oil path is used to quickly open the cartridge valve V1, and the oil flows from the mold locking cavity 211 of the mold locking cylinder 21 to the mold breaking cavity 212 of the mold locking cylinder 21 to realize differential mold breaking.
Fig. 3 shows a simplified hydraulic principle diagram of a first pilot control oil path and a second pilot control oil path, wherein the first pilot control oil path: a pilot port, namely a port C, of the cartridge valve V1 reaches a point D in the graph 2 through a first damping ZN1, reaches a point E in the graph 2 through a third damping ZN3, reaches a point F in the graph 2 through a fourth damping ZN4, and reaches a side working port, namely a port B, of the cartridge valve V1 through a fifth damping ZN 5; a second pilot control oil path: the bottom working oil port, namely the port A, of the cartridge valve V1 reaches the point E in the figure 2 through the second damping ZN2, reaches the point F in the figure 2 through the fourth damping ZN4, and reaches the side working oil port, namely the port B, of the cartridge valve V1 through the fifth damping ZN 5. When the mold locking pressure relief action starts, the pressure of a working oil port at the bottom of the cartridge valve V1, namely the port A, is mold locking pressure, and the pressure of a pilot port of the cartridge valve V1, namely the port C, is mold locking pressure because the valve core of the cartridge valve V1 is a 1:1 valve core, and the pressure of a working oil port at the side edge of the cartridge valve V1, namely the port B, is zero because the working oil port is communicated with the mold breaking cavity 212.
In this embodiment, the differential mode-locking pressure relief oil path further includes a small-flow overflow valve V4, the pressure of the overflow valve V4 is set to 30bar, a pilot port, i.e., a port C, of the cartridge valve V1 is communicated with an oil inlet, i.e., a port P, of the first two-position two-way electromagnetic directional valve V2, a pilot port, i.e., a port C, of the communicating pipe close to the cartridge valve V1 is provided with a first damping ZN1, an oil return port, i.e., a port T, of the first two-position two-way electromagnetic directional valve V2 is communicated with the oil tank 20, an oil inlet of the overflow valve V4 is communicated with the mode-locking cavity 211 of the mode-locking cylinder 21, an oil outlet of the overflow valve V4 is communicated with an oil inlet, i.e., a port P, of the second two-position two-way electromagnetic directional valve V3, an oil return port, i.e., a port T, of the second two-position two-way electromagnetic directional valve V3 is communicated with the mode-locking cavity 212 of the mode-locking cylinder 21, a damping oil return port ZN5 is provided on the communicating pipe close to the damping oil return port ZN2, a working port a bottom working port a working port V4 of the cartridge valve V1 is communicated with the communicating pipe, and a working communicating pipe are provided with the second two-position two-way electromagnetic directional valve V3, and a damping oil return port b working communicating pipe is provided with the second damping oil return port 2 and the communicating pipe A bottom working oil port, namely an A port, of the cartridge valve V1 is communicated with a pilot port, namely a C port, of the cartridge valve V1, a third damping ZN3 is arranged on a communication pipeline, one end of the third damping ZN3 is located between the first damping ZN1 and an oil inlet, namely a P port, of the first two-position two-way electromagnetic directional valve V2, and the other end of the third damping ZN3 is located between the second damping ZN2 and the fourth damping ZN 4.
In this embodiment, the mold clamping piston (not shown) in the mold clamping cylinder 21 and the hose passage (not shown) of the mold clamping cavity 211 and the mold breaking cavity 212 of the mold clamping cylinder 21 are flexible devices. When the mode locking pressure relief action, the high pressure oil in the mode locking cavity 211 is relieved to the broken cavity 212 through the cartridge valve V1, and through mode locking piston and hose channel buffering, vibration absorption, impact and noise when further can reduce the mode locking pressure relief, realize flexible mode locking pressure relief.
In the present embodiment, the pressure difference across the first damping ZN1 is controlled to be within 30 bar. Through the relation between the pressure difference at two ends of the damping and the sectional area, the pressure difference at two ends of the first damping ZN1 (namely the pressure difference between a pilot port, namely a port C, of the plug-in valve V1 and a point D in the figure 2) can be obtained through a liquid resistance calculation formula, the pressure difference is suitable for the first damping ZN1, the second damping ZN2, the third damping ZN3, the fourth damping ZN4 and the fifth damping ZN5, the two ends of the first damping ZN1 can be always kept at lower pressure difference, and the pressure release speed of the mode locking is considered, and the pressure difference at two ends of the first damping ZN1 is controlled within 30bar preferably.
In the present embodiment, the first two-position two-way electromagnetic directional valve V2 functions as a switching valve, and the second two-position two-way electromagnetic directional valve V3 functions as a pressure relief valve; the sizes of damping holes of the first damping ZN1, the second damping ZN2, the third damping ZN3, the fourth damping ZN4 and the fifth damping ZN5 can be determined through combined adjustment, and the pressure difference at two ends of the first damping ZN1 can be controlled within 30 bar.
Claims (5)
1. The utility model provides a differential type mode locking pressure release oil circuit for two board-like injection molding machines which characterized in that: the electromagnetic directional control valve comprises a cartridge valve with a valve core of 1:1, a first two-position two-way electromagnetic directional valve, a second two-position two-way electromagnetic directional valve and an oil tank; a bottom working oil port of the cartridge valve is communicated with a mold locking cavity of the mold locking oil cylinder, and a side working oil port of the cartridge valve is communicated with a mold breaking cavity of the mold locking oil cylinder to form a main channel oil way; when the electromagnet of the second two-position two-way electromagnetic reversing valve is electrified, a pilot port of the cartridge valve sequentially passes through a first damper, a third damper and a fourth damper, a channel from an oil inlet to an oil return port of the second two-position two-way electromagnetic reversing valve and a side working oil port of the cartridge valve from a fifth damper to form a first pilot control oil path, and a bottom working oil port of the cartridge valve sequentially passes through the second damper and the fourth damper, a channel from an oil inlet to the oil return port of the second two-position two-way electromagnetic reversing valve and a side working oil port of the cartridge valve from the fifth damper to form a second pilot control oil path; when the electromagnet of the first two-position two-way electromagnetic directional valve is electrified, the pilot port of the cartridge valve sequentially passes through the first damper and a passage from the oil inlet to the oil return port of the first two-position two-way electromagnetic directional valve to reach the oil tank to form a third pilot control oil path; when the mold locking and pressure releasing actions are carried out, the cartridge valve is slowly opened by utilizing the first pilot control oil way and the second pilot control oil way, and oil flows to a broken mold cavity of the mold locking oil cylinder from a mold locking cavity of the mold locking oil cylinder to realize differential mold locking and pressure releasing of two cavities of the mold locking oil cylinder; when the mold is broken, the third pilot control oil way is used for quickly opening the cartridge valve, and oil flows to a broken mold cavity of the mold locking oil cylinder from the mold locking cavity of the mold locking oil cylinder to realize differential mold breaking.
2. The differential mode-locking pressure relief oil circuit for a two-plate injection molding machine according to claim 1, characterized in that: the differential mode-locking pressure-relief oil way also comprises a small-flow overflow valve, wherein a pilot port of the cartridge valve is communicated with an oil inlet of the first two-position two-way electromagnetic reversing valve, a first damping is arranged on the communicating pipe close to the pilot port of the cartridge valve, an oil return port of the first two-position two-way electromagnetic reversing valve is communicated with the oil tank, an oil inlet of the overflow valve is communicated with a mode-locking cavity of the mode-locking oil cylinder, an oil outlet of the overflow valve is communicated with an oil inlet of the second two-position two-way electromagnetic reversing valve, an oil return port of the second two-position two-way electromagnetic reversing valve is communicated with a broken cavity of the mode-locking oil cylinder, a fifth damping is arranged on the communicating pipe close to the oil return port of the second two-position two-way electromagnetic reversing valve, a bottom working oil port of the cartridge valve is communicated with an oil outlet of the overflow valve, and the communicating pipe is sequentially provided with the second damping and the fourth damping, the bottom working oil port of the cartridge valve is communicated with the pilot port of the cartridge valve, a third damper is arranged on a communication pipeline, one end of the third damper is located between the first damper and the oil inlet of the first two-position two-way electromagnetic directional valve, and the other end of the third damper is located between the second damper and the fourth damper.
3. The differential mode-locking pressure relief oil circuit for a two-plate injection molding machine according to claim 2, characterized in that: the pressure of the overflow valve is set to 30 bar.
4. A differential mode-locking pressure-relief oil passage for a two-plate injection molding machine according to any one of claims 1 to 3, characterized in that: and a flexible device is adopted for a mold locking piston in the mold locking oil cylinder, a mold locking cavity of the mold locking oil cylinder and a hose channel of the mold breaking cavity.
5. The differential mode-locking pressure relief oil circuit for a two-plate injection molding machine according to claim 4, characterized in that: the pressure difference between the two ends of the first damper is controlled within 30 bar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110941205.XA CN113771320A (en) | 2021-08-17 | 2021-08-17 | Differential mode locking pressure relief oil way for two-plate injection molding machine |
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| CN202110941205.XA CN113771320A (en) | 2021-08-17 | 2021-08-17 | Differential mode locking pressure relief oil way for two-plate injection molding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071082A (en) * | 2022-04-29 | 2022-09-20 | 宁波长飞亚塑料机械制造有限公司 | Micro-mold opening system for realizing correlation injection molding machine and control method thereof |
| CN118082134A (en) * | 2024-04-18 | 2024-05-28 | 宁波力劲塑机智造有限公司 | Hydraulic system and special logistics machine for injection molding machine |
-
2021
- 2021-08-17 CN CN202110941205.XA patent/CN113771320A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071082A (en) * | 2022-04-29 | 2022-09-20 | 宁波长飞亚塑料机械制造有限公司 | Micro-mold opening system for realizing correlation injection molding machine and control method thereof |
| CN115071082B (en) * | 2022-04-29 | 2023-09-19 | 宁波长飞亚塑料机械制造有限公司 | Micro-die opening system for realizing correlation injection molding machine and control method thereof |
| CN118082134A (en) * | 2024-04-18 | 2024-05-28 | 宁波力劲塑机智造有限公司 | Hydraulic system and special logistics machine for injection molding machine |
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Inventor after: Zhou Donghai Inventor after: Li Jiong Inventor after: Rao Leqing Inventor after: Zhang Bin Inventor after: Zhou Jianrong Inventor after: Wei Jiayong Inventor before: Zhou Donghai Inventor before: Li Jiong Inventor before: Rao Leqing Inventor before: Zhou Jianrong Inventor before: Wei Jiayong |