CN113503280A - Injection hydraulic system and die casting machine - Google Patents
Injection hydraulic system and die casting machine Download PDFInfo
- Publication number
- CN113503280A CN113503280A CN202110792606.3A CN202110792606A CN113503280A CN 113503280 A CN113503280 A CN 113503280A CN 202110792606 A CN202110792606 A CN 202110792606A CN 113503280 A CN113503280 A CN 113503280A
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- China
- Prior art keywords
- hydraulic
- valve
- cartridge valve
- injection
- pipeline
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
- F15B2013/004—Cartridge valves
Abstract
The invention discloses an injection hydraulic system and a die casting machine. Wherein, press the hydraulic system of penetrating to be applied to the die casting machine, the die casting machine includes presses the hydro-cylinder of penetrating, it has the injection chamber to press the hydro-cylinder of penetrating, it includes to press the hydraulic system of penetrating: the first oil supply system is connected with the injection cavity pipeline; a second oil supply system; the injection acceleration system comprises a first cartridge valve, a second cartridge valve and a reversing valve, the first cartridge valve is connected with the second oil supply system through a first hydraulic pipeline and is connected with the injection cavity pipeline, the reversing valve is connected with the first hydraulic pipeline through a second hydraulic pipeline and is connected with the first cartridge valve through a third hydraulic pipeline, the second cartridge valve is connected with the third hydraulic pipeline in parallel, and the second cartridge valve is connected with an oil tank. The injection hydraulic system of the technical scheme of the invention can improve the acceleration of injection and meet the processing requirements of products.
Description
Technical Field
The invention relates to the technical field of die casting equipment, in particular to an injection hydraulic system and a die casting machine.
Background
The injection filling process of the die casting machine generally comprises 4 processes of retarding, quick, pressurizing and pressure maintaining cooling, wherein the retarding stage is used for exhausting and pushing the molten metal to a pouring gate, the quick stage is a quick filling forming process before the molten metal is cooled, and the pressurizing and pressure maintaining cooling process enables a formed product to form a compact structure. Because the temperature of the molten metal is reduced too fast, the filling time is short and the filling stroke is limited, the molten metal needs to be instantly increased from a low speed to a required high-speed filling speed in a fast stage, and the product forming effect is ensured. The shorter the time of the rapid stage from low speed to high speed, the better the filling effect, which is reflected in the technical index of injection, that is, the higher the acceleration, the shorter the acceleration time, and the shorter the corresponding acceleration distance, which is particularly important for the die-casting of the product.
In the related art, as shown in chinese patent No. CN110918937A, whose application date is 2019.11.07, the control valve is electrically reversed during acceleration lifting at a fast stage, so that both valve ports of the control valve can be communicated to the oil tank, thereby forming a dual-channel oil return, so as to shorten the hydraulic oil discharge time of the fast cartridge valve and increase the acceleration. However, in this way, because the flow rate of the control valve itself is small, the oil return time for forming the double channel is still long, and the acceleration increasing effect still cannot meet the processing requirements of some thin-wall products.
Disclosure of Invention
The invention mainly aims to provide a hydraulic system for injection, which aims to improve the acceleration of injection and meet the processing requirement of products.
In order to achieve the above object, the present invention provides an injection hydraulic system for a die casting machine, wherein the die casting machine includes an injection cylinder, the injection cylinder has an injection cavity, and the injection hydraulic system includes:
the first oil supply system is connected with the injection cavity pipeline;
a second oil supply system; and
the injection acceleration system comprises a first cartridge valve, a second cartridge valve and a reversing valve, the first cartridge valve is connected with the second oil supply system through a first hydraulic pipeline and is connected with the injection cavity pipeline, the reversing valve is connected with the first hydraulic pipeline through a second hydraulic pipeline and is connected with the first cartridge valve through a third hydraulic pipeline, the second cartridge valve is connected with the third hydraulic pipeline in parallel, and the second cartridge valve is connected with an oil tank.
Optionally, a first check valve for controlling hydraulic oil to flow to the first cartridge valve is arranged on the third hydraulic pipeline, and the second cartridge valve is connected with the first check valve in parallel.
Optionally, the number of the direction-changing valves is plural, and the plural direction-changing valves are connected in parallel between the second hydraulic line and the third hydraulic line.
Optionally, the number of the reversing valves is two, one of the reversing valves is defined as a first reversing valve, the other reversing valve is defined as a second reversing valve, and the second cartridge valve is connected to the first reversing valve and the second reversing valve at positions on the third hydraulic line in parallel.
Optionally, a second one-way valve is arranged on a pipeline connecting the first oil supply system and the first cartridge valve with the injection cavity to prevent the hydraulic oil in the injection cavity from flowing back.
Optionally, the directional valve is a solenoid directional valve.
Optionally, the second cartridge valve is further provided with an opening degree adjusting device, so that the valve opening degree of the second cartridge valve is adjusted through the opening degree adjusting device.
Optionally, an accumulator is further connected to a pipeline between the second oil supply system and the joint of the second hydraulic pipeline and the first hydraulic pipeline.
Optionally, a third check valve is further connected to a pipeline between the energy accumulator and the oil supply system to prevent the hydraulic oil from flowing back to the second oil supply system.
The invention also provides a die casting machine, which comprises an injection oil cylinder and an injection hydraulic system, wherein the injection oil cylinder is provided with an injection cavity, and the injection hydraulic system comprises:
the first oil supply system is connected with the injection cavity pipeline;
a second oil supply system; and
the injection acceleration system comprises a first cartridge valve, a second cartridge valve and a reversing valve, the first cartridge valve is connected with the second oil supply system through a first hydraulic pipeline and is connected with the injection cavity pipeline, the reversing valve is connected with the first hydraulic pipeline through a second hydraulic pipeline and is connected with the first cartridge valve through a third hydraulic pipeline, the second cartridge valve is connected with the third hydraulic pipeline in parallel, and the second cartridge valve is connected with an oil tank.
According to the hydraulic system for injection, disclosed by the technical scheme of the invention, in the process of injection, the first oil supply system is connected with the injection cavity pipeline, so that oil can be supplied for slow injection of a die casting machine. The first cartridge valve is connected with the second oil supply system through a first hydraulic pipeline, the first cartridge valve is connected with the injection cavity pipeline, and the reversing valve is connected with the first hydraulic pipeline through a second hydraulic pipeline and connected with the first cartridge valve through a third hydraulic pipeline. Therefore, when the first cartridge valve is opened to enable high-pressure hydraulic oil to enter the injection cavity, the reversing valve can be controlled to be reversed after being electrified, the second cartridge valve is opened through oil discharge of the reversing valve, the first cartridge valve is also quickly opened after the second cartridge valve is opened, and the oil discharge of the first cartridge valve can be directly discharged to an oil tank through the second cartridge valve. In the mode, because first cartridge valve directly carries out the oil extraction through the bigger second cartridge valve of flow, avoided carrying out the mode of oil extraction through the switching-over valve of low discharge among the relevant scheme, realize opening fast of first cartridge valve, make hydraulic oil get into the flow increase rate who penetrates the chamber and obtain improving by a wide margin, improved the acceleration of pressing and penetrate, satisfy the processing demand of product.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of an embodiment of a shot hydraulic system of the present invention;
fig. 2 is a schematic view of another embodiment of the shot hydraulics system of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides a hydraulic shot system 100.
Referring to fig. 1, in an embodiment of the present invention, the shot hydraulic system 100 is applied to a die casting machine including a shot cylinder 210, the shot cylinder 210 having a shot cavity 211, the shot hydraulic system 100 including:
the first oil supply system 10 is connected with the injection cavity 211 in a pipeline mode;
a second oil supply system 20; and
the injection acceleration system 30 comprises a first cartridge valve 31, a second cartridge valve 32 and a reversing valve 33, the first cartridge valve 31 is connected with the second oil supply system 20 through a first hydraulic pipeline a and is in pipeline connection with the injection cavity 211, the reversing valve 33 is connected with the first hydraulic pipeline a through a second hydraulic pipeline b and is connected with the first cartridge valve 31 through a third hydraulic pipeline c, the second cartridge valve 32 is connected with the third hydraulic pipeline c in parallel, and the second cartridge valve 32 is connected with an oil tank 40.
In practical application, the injection cylinder 210 of the die casting machine comprises a cylinder body and an injection piston which is movably arranged in the cylinder body and can extend out, wherein an injection cavity 211 is formed in the cylinder body, and when hydraulic oil enters the injection cavity 211, the injection piston can be pushed to move so as to perform injection filling movement.
The injection filling process of the die casting machine generally comprises 4 processes of retarding, quick, pressurizing and pressure maintaining cooling, wherein the retarding stage is used for exhausting and pushing the molten metal to a pouring gate, the quick stage is a quick filling forming process before the molten metal is cooled, and the pressurizing and pressure maintaining cooling process enables a formed product to form a compact structure. In the retarding stage, the reversing valve 33 is not powered, and the first cartridge valve 31 and the second cartridge valve 32 are in a closed state at the moment, so that hydraulic oil passing through the first oil supply system 10 enters the injection cavity 211 to push the injection piston to be pushed slowly; in the rapid stage, on the basis that the first oil supply system 10 continuously supplies oil, when it is detected that rapid pushing of die casting is required, the reversing valve 33 is powered on, at this time, the second cartridge valve 32 is opened by discharging oil through the reversing valve 33, the first cartridge valve 31 is opened along with the opening of the second cartridge valve 32, and high-pressure hydraulic oil of the second oil supply system 20 enters the injection cavity 211 through the first cartridge valve 31 to push the injection piston.
Therefore, the hydraulic injection system 100 according to the present invention can supply oil for a slow injection of a die casting machine by connecting the first oil supply system 10 to the injection cavity 211 through a pipe during the injection. The first cartridge valve 31 is connected to the second oil supply system 20 via a first hydraulic line a, the first cartridge valve 31 is connected to the shot chamber 211 via a line, and the selector valve 33 is connected to the first hydraulic line a via a second hydraulic line b and to the first cartridge valve 31 via a third hydraulic line c. Therefore, when the first cartridge valve 31 is opened to allow high pressure hydraulic oil to enter the shot cavity 211, the direction switching valve 33 is controlled to be switched after the direction switching valve 33 is energized, and the second cartridge valve 32 is opened by discharging oil through the direction switching valve 33, so that the first cartridge valve 31 is rapidly opened after the second cartridge valve 32 is opened, and the discharged oil from the first cartridge valve 31 can be directly discharged to the oil tank through the second cartridge valve 32. In this way, because the first cartridge valve 31 directly discharges oil through the second cartridge valve 32 with a larger flow rate, the way of discharging oil through the reversing valve 33 with a small flow rate in the related scheme is avoided, the first cartridge valve 31 is quickly opened, the rate of increasing the flow rate of hydraulic oil entering the injection cavity 211 is greatly increased, the acceleration of injection is increased, and the processing requirement of the product is met.
Further, in this application, a first check valve 50 is arranged on the third hydraulic pipeline c to control the flow direction of the hydraulic oil to the first cartridge valve 31, and the second cartridge valve 32 is connected in parallel with the first check valve 50. In the embodiment, the hydraulic oil passing through the reversing valve 33 is led to the second cartridge valve 32 and then enters the first cartridge valve 31 through the first check valve 50 connected in parallel, and the first check valve 50 can block a large flow of oil discharge generated when the first cartridge valve 31 is rapidly opened in the dynamic opening process from generating a blocking effect on the opening of the second cartridge valve 32.
In an embodiment of the present application, the number of the direction changing valves 33 is plural, and the plural direction changing valves 33 are connected in parallel between the second hydraulic line b and the third hydraulic line c. In particular, the number of directional valves 33 may be 2, 3, 4, or more. The plurality of switching valves 33 are arranged in parallel, so that the hydraulic oil in the second oil supply system 20 can flow to the first cartridge valve 31 through the plurality of switching valves 33 at the same time, that is, the flow rate between the second hydraulic line b and the third hydraulic line c is increased, and when the flow rate of the first cartridge valve 31 is large, the spring chamber of the first cartridge valve 31 can be filled quickly, so that the first cartridge valve 31 can be closed quickly even when the flow rate of the first cartridge valve 31 is large, the closing time is shortened, and quick response is realized.
Referring to fig. 2, in an embodiment, the number of the direction-changing valves 33 is two, one of the direction-changing valves 33 is defined as a first direction-changing valve 331, the other direction-changing valve 33 is defined as a second direction-changing valve 332, and the second cartridge valve 32 is connected to the first direction-changing valve 331 and the second direction-changing valve 332 at positions in parallel on the third hydraulic line c. With the arrangement, on one hand, the first direction changing valve 331 and the second direction changing valve 332 are controlled to be electrified, so that the second cartridge valve 32 is opened, and the first cartridge valve 31 is rapidly opened in the same way; on the other hand, the simultaneous arrangement of the first direction changing valve 331 and the second direction changing valve 332 can increase the oil inlet amount of the spring cavities of the first cartridge valve 31 and the second cartridge valve 32, and when the first cartridge valve 31 and the second cartridge valve 32 need to be closed, the quick closing of the first cartridge valve 31 and the second cartridge valve 32 with different specifications, particularly large specifications, can be realized.
Further, a second check valve 60 is arranged on a pipeline connecting the first oil supply system 10 and the first cartridge valve 31 with the injection cavity 211 to prevent the hydraulic oil in the injection cavity 211 from flowing back. A second check valve 60 may be mounted in the line of the inlet port of the shot cavity 211 to prevent hydraulic oil from flowing back to the first oil supply system 10 and the shot acceleration system 30.
Further, the direction changing valve 33 is an electromagnetic direction changing valve. Specifically, the direction valve 33 may be a two-position four-way electromagnetic direction valve. Because of the self-loop, the self-loop type automatic control valve is more sensitive to reaction than other automatic control valves. The power consumption of the coil of the electromagnetic reversing valve is low, and the electromagnetic reversing valve belongs to an energy-saving product; and the valve position can be automatically kept only by triggering action, so that the power consumption is low. Therefore, the response time can be further shortened by selecting the electromagnetic directional valve, and the injection acceleration can be favorably improved.
In an embodiment of the present application, the second cartridge valve 32 is further provided with an opening degree adjusting device 70, so that the valve opening degree of the second cartridge valve 32 is adjusted by the opening degree adjusting device 70. The opening degree adjusting device 70 may adopt an opening degree adjuster in the prior art, and the opening degree adjusting device 70 is additionally installed on the second cartridge valve 32, so that the valve opening degree of the second cartridge valve 32 can be adjusted according to actual conditions, different injection acceleration adjustments can be realized, and die-casting molding of different products can be realized.
Further, an accumulator 80 is connected to a pipe between the connection point of the second hydraulic pipe b and the first hydraulic pipe a and the second oil supply system 20. The accumulator 80 can convert the energy in the second oil supply system 20 into compression energy or potential energy for storage, and when the injection acceleration system 30 needs it, the compression energy or potential energy is converted into hydraulic or pneumatic energy for release and resupply. When the shot acceleration system 30 momentarily increases in pressure, it can absorb this portion of the energy to ensure that the overall system pressure is normal. Therefore, the accumulator 80 can ensure that the second oil supply system 20 provides stable high-pressure hydraulic oil, and the normal operation of the system is ensured.
Further, a third check valve 90 is connected to a pipeline between the accumulator 80 and the oil supply system to prevent the hydraulic oil from flowing back to the second oil supply system 20.
The invention further provides a die casting machine, which comprises the injection hydraulic system 100, the specific structure of the injection hydraulic system 100 refers to the above embodiments, and the die casting machine adopts all technical schemes of all the above embodiments, so that all the beneficial effects brought by the technical schemes of the above embodiments are at least achieved, and the details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a hydraulic system is penetrated to pressure, is applied to the die casting machine, the die casting machine includes the hydro-cylinder of penetrating, the hydro-cylinder of penetrating has the pressure chamber of penetrating, its characterized in that, hydraulic system is penetrated to the pressure includes:
the first oil supply system is connected with the injection cavity pipeline;
a second oil supply system; and
the injection acceleration system comprises a first cartridge valve, a second cartridge valve and a reversing valve, the first cartridge valve is connected with the second oil supply system through a first hydraulic pipeline and is connected with the injection cavity pipeline, the reversing valve is connected with the first hydraulic pipeline through a second hydraulic pipeline and is connected with the first cartridge valve through a third hydraulic pipeline, the second cartridge valve is connected with the third hydraulic pipeline in parallel, and the second cartridge valve is connected with an oil tank.
2. The shot hydraulic system of claim 1 wherein said third hydraulic line is provided with a first one-way valve controlling the flow of hydraulic oil to said first cartridge valve, said second cartridge valve being connected in parallel with said first one-way valve.
3. The shot hydraulic system of claim 1 wherein said plurality of diverter valves is in plurality, said plurality of diverter valves being connected in parallel between said second hydraulic line and said third hydraulic line.
4. The shot hydraulic system of claim 3 wherein said plurality of diverter valves is two and defines one of said diverter valves as a first diverter valve and the other of said diverter valves as a second diverter valve, said first and second diverter valves being connected to said second cartridge valve at a parallel location on said third hydraulic line.
5. The shot hydraulic system of claim 1 wherein said first oil supply system and said first cartridge valve are provided with a second check valve on the line connecting said shot chamber to prevent backflow of hydraulic oil within said shot chamber.
6. The shot hydraulic system of claim 1 wherein said reversing valve is a solenoid reversing valve.
7. The injection hydraulic system as defined in any one of claims 1 to 6 wherein said second cartridge valve is further provided with an opening degree adjustment device for adjusting the valve opening degree of said second cartridge valve by said opening degree adjustment device.
8. An injection hydraulic system as defined in any one of claims 1 to 6 wherein an accumulator is also connected to the line between the junction of said second hydraulic line and said first hydraulic line and said second oil supply system.
9. The shot hydraulic system of claim 8 wherein a third check valve is further connected in line between said accumulator and said oil supply system to prevent the backflow of hydraulic oil to said second oil supply system.
10. A die casting machine comprising an injection hydraulic system as defined in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110792606.3A CN113503280A (en) | 2021-07-13 | 2021-07-13 | Injection hydraulic system and die casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110792606.3A CN113503280A (en) | 2021-07-13 | 2021-07-13 | Injection hydraulic system and die casting machine |
Publications (1)
| Publication Number | Publication Date |
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| CN113503280A true CN113503280A (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110792606.3A Pending CN113503280A (en) | 2021-07-13 | 2021-07-13 | Injection hydraulic system and die casting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113503280A (en) |
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2021
- 2021-07-13 CN CN202110792606.3A patent/CN113503280A/en active Pending
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