CN110701345B - Injection check valve of die casting machine and die casting machine hydraulic system using same - Google Patents

Injection check valve of die casting machine and die casting machine hydraulic system using same Download PDF

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Publication number
CN110701345B
CN110701345B CN201910960326.1A CN201910960326A CN110701345B CN 110701345 B CN110701345 B CN 110701345B CN 201910960326 A CN201910960326 A CN 201910960326A CN 110701345 B CN110701345 B CN 110701345B
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China
Prior art keywords
oil
valve
hole
injection
die casting
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CN201910960326.1A
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Chinese (zh)
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CN110701345A (en
Inventor
汪宝生
冯永胜
景友燕
余楠
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Yizhimi Co ltd
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Yizhimi Co ltd
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Priority to CN201910960326.1A priority Critical patent/CN110701345B/en
Publication of CN110701345A publication Critical patent/CN110701345A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • 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
    • 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
    • F15B13/027—Check valves
    • 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
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses a pressure injection one-way valve of a die casting machine, which comprises a valve body, a mounting cavity, an oil inlet hole, an oil outlet hole, a main control oil hole, an auxiliary control oil hole, an oil groove, a valve core and an elastic reset mechanism, wherein the valve body is provided with a plurality of mounting cavities; the valve core is movably arranged in the mounting cavity along the axial direction; the oil inlet hole is arranged along the axial direction of the valve core and is in conductive connection with the mounting cavity and an external oil supply device; the oil outlet is communicated with the mounting cavity and the injection rear cavity of the external die casting device; one end of the valve core is opposite to the oil inlet hole, and the elastic reset mechanism is connected between the other end of the valve core and the mounting cavity; the invention aims to provide the injection one-way valve of the die casting machine and the hydraulic system of the die casting machine, which can realize active opening and quick closing, reduce pressure loss during slow or quick oil inlet, have large through flow, quick closing during pressurization, quick response, simple structure and convenient maintenance.

Description

Injection check valve of die casting machine and die casting machine hydraulic system using same
Technical Field
The invention relates to the technical field of check valves, in particular to a die casting machine injection check valve and a die casting machine hydraulic system using the same.
Background
The quick oil way is required to be quickly closed when the pressure is increased by injection, so that the purpose of quick pressure building is achieved, and a check valve is required to be quickly closed, and the check valve needs to have large through flow and quick response. The check valve designed by the current domestic die casting machine has the following defects: when the quick oil passes through, the oil is required to push the one-way valve open, so that certain pressure loss exists; the check valve is closed by spring pressure, the closing time of the check valve is longer when the spring pressure is small, and the pressure loss is large when oil flows through the check valve when the oil is rapidly fed due to the large spring force.
Disclosure of Invention
The invention aims to provide a die casting machine injection check valve capable of being actively opened and rapidly closed and a die casting machine hydraulic system using the same.
To achieve the purpose, the invention adopts the following technical scheme: the injection one-way valve of the die casting machine comprises a valve body, a mounting cavity, an oil inlet hole, an oil outlet hole, a main control oil hole, an auxiliary control oil hole, an oil groove, a valve core and an elastic reset mechanism; the valve core is movably arranged in the mounting cavity along the axial direction; the oil inlet hole is arranged along the axial direction of the valve core and is in conductive connection with the mounting cavity and an external oil supply device; the oil outlet is communicated with the mounting cavity and the injection rear cavity of the external die casting device; one end of the valve core is opposite to the oil inlet hole, and the elastic reset mechanism is connected between the other end of the valve core and the mounting cavity; when the valve is in a closed state, one end of the valve core is in contact sealing with the valve body, and the oil inlet hole is isolated from the oil outlet hole; when in an open state, one end of the valve core is separated from the valve body, and the oil inlet hole is communicated with the oil outlet hole; the oil groove is arranged on the outer wall of the valve core along the circumferential direction, and the main control oil hole is connected with the oil groove and an external oil supply device in a conducting manner; the auxiliary control oil hole is arranged at one end of the valve body, which is far away from the oil inlet hole, and the auxiliary control oil hole is connected with the mounting cavity and the injection rear cavity of the external die casting device in a conducting manner.
Preferably, the valve body comprises an oil way block, a mounting groove, a valve sleeve and a gland, wherein the mounting groove is arranged in the oil way block, the valve sleeve is arranged in the mounting groove, one end of the gland is connected with the opening end of the mounting groove and is matched with the oil way block to fix the valve sleeve; the mounting cavity is formed by matching an inner end surface of the gland and an inner end surface of the valve sleeve; the valve sleeve is provided with a first oil passing hole, a second oil passing hole and a third oil passing hole, and the first oil passing hole is connected with the inside of the valve sleeve and the oil inlet hole in a conducting manner; the second oil passing hole is connected with the inside of the valve sleeve and the oil outlet in a conducting manner, and the third oil passing hole is connected with the oil groove and the main control oil hole in a conducting manner; the distance between the second oil passing hole and one end of the valve sleeve, which is close to the oil inlet hole, is 3-8mm.
Preferably, the valve sleeve comprises a connecting sleeve and a connecting ring, the connecting ring and the connecting sleeve are sequentially connected along the axial direction, and the inner diameter of the connecting sleeve is smaller than the inner diameter of the connecting ring; the inner diameter of the connecting sleeve is matched with the outer diameter of the valve core, a positioning ring is formed at one end of the valve core, which is far away from the oil inlet hole, and the outer diameter of the positioning ring is matched with the inner diameter of the connecting ring; the oil groove is formed by matching the connecting sleeve, the connecting ring, the valve sleeve, the positioning ring and the valve core; the first oil passing hole is formed in the connecting sleeve along the axial direction, and the second oil passing hole is arranged on the side wall of the connecting sleeve along the circumferential direction; the oil way block is provided with an annular first oil distribution groove which is connected with the third oil passing hole in a conducting way.
Preferably, the second oil passing hole is provided with at least one, the second oil passing hole is arranged along the circumferential direction of the valve sleeve, and the inner end surface of the oil path block is provided with an annular second oil distribution groove which is in conductive connection with the second oil passing hole.
Preferably, a first connecting inclined plane is formed on the outer edge of one end of the valve core, which is close to the oil inlet hole, along the circumferential direction, a limiting ring is formed on the inner end surface of the connecting sleeve, and a second connecting inclined plane which is adaptive to the first connecting inclined plane is arranged at one end of the limiting ring.
Preferably, the connecting sleeve is provided with a first sealing ring and a second sealing ring along the circumferential direction, and the first sealing ring and the second sealing ring are respectively positioned at two sides of the second oil passing hole; the inner end of the oil way block is provided with a connecting groove, one end of the connecting sleeve is positioned in the connecting groove, and the first sealing ring is arranged between the connecting sleeve and the connecting groove; the connecting ring is provided with a third sealing ring along the circumferential direction, and the second sealing ring and the third sealing ring are respectively positioned at two sides of the third oil passing hole.
Preferably, a fourth sealing ring is arranged at one end of the gland, which is positioned in the mounting cavity, along the circumferential direction; and an oil passing notch which is connected with the auxiliary control oil hole in a conducting way is formed in the other end of the gland close to the oil inlet hole.
Preferably, the elastic reset mechanism is a telescopic spring connected between the mounting cavity and the valve core.
A hydraulic system of a die casting machine, the system comprising a rapid energy accumulator, a one-way control valve, a rapid valve, a shot cylinder, a booster valve, a booster energy accumulator and the die casting machine shot one-way valve of any one of claims 1 to 8; the quick energy accumulator is in conductive connection with the one-way control valve and the quick valve through pipelines, the quick valve is in conductive connection with an oil inlet hole of the injection one-way valve of the die casting machine through pipelines, and the one-way control valve is in conductive connection with a main control oil hole of the injection one-way valve of the die casting machine through pipelines; the oil outlet of the injection check valve of the die casting machine is in conductive connection with the injection rear cavity of the injection cylinder through a pipeline, and the auxiliary control oil hole of the injection check valve of the die casting machine is in conductive connection with the injection rear cavity of the injection cylinder through a pipeline; the pressure boosting energy accumulator is connected with the pressure boosting valve in a conducting way through a pipeline, the pressure boosting valve is connected with the pressure boosting oil cylinder through a pipeline, and the output end of the pressure boosting oil cylinder is connected with a pushing piston arranged in a post-injection cavity of the injection oil cylinder.
By adopting the structure, hydraulic oil is added or discharged into the main control oil hole and the oil groove, the aim of controlling the one-way valve to be opened or closed is achieved, the through flow is large, the control is simple, and the pressure loss is not generated when the valve core is opened; the auxiliary control oil hole and the oil outlet hole are connected with the injection rear cavity of the external injection device in a conducting way, when the pressure of the injection rear cavity reaches a preset value, the auxiliary control oil hole generates feedback, the pressure difference at the two ends of the valve core enables the valve core to be closed quickly, the reaction is quick, and the closing time is short.
Drawings
The present invention is further illustrated by the accompanying drawings, which are not to be construed as limiting the invention in any way.
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic cross-sectional view of the structure at A-A in FIG. 1;
FIG. 3 is a schematic cross-sectional view of the valve sleeve of the present invention;
fig. 4 is a schematic diagram showing connection of a hydraulic system of the die casting machine in the present invention.
Wherein: the valve body 1, the mounting cavity 2, the oil inlet hole 3, the oil outlet hole 4, the main control oil hole 5, the auxiliary control oil hole 6, the oil groove 7, the valve core 8, the positioning ring 8a, the elastic reset mechanism 9, the oil circuit block 10, the valve sleeve 11, the first oil passing hole 11a, the second oil passing hole 11b, the third oil passing hole 11c, the connecting sleeve 11d, the connecting ring 11e, the gland 12, the oil passing notch 12a, the first sealing ring 13, the second sealing ring 14, the third sealing ring 15, the fourth sealing ring 16, the quick accumulator 17, the one-way control valve 18, the quick valve 19, the injection oil cylinder 20, the booster oil cylinder 21, the booster valve 22, the booster accumulator 23, the first oil distributing groove 24, the second oil distributing groove 25 and the injection one-way valve 26 of the die casting machine.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 4, a check valve for injection molding of a die casting machine of the present embodiment includes a valve body 1, a mounting chamber 2, an oil inlet 3, an oil outlet 4, a main control oil hole 5, an auxiliary control oil hole 6, an oil groove 7, a valve core 8, and an elastic return mechanism 9.
The installation cavity 2 is arranged in the valve body 1, and the valve core 8 is movably arranged in the installation cavity 2 along the axial direction.
The oil inlet hole 3 is arranged along the axial direction of the valve core 8 and is in conductive connection with the installation cavity 2 and an external oil supply device; the oil outlet 4 is in conductive connection with the mounting cavity 2 and the injection rear cavity of the external die casting device.
One end of the valve core 8 is opposite to the oil inlet hole 3, and the elastic reset mechanism 9 is connected between the other end of the valve core 8 and the installation cavity 2.
When in a closed state, one end of the valve core 8 is in contact sealing with the valve body 1, and the oil inlet hole 3 is isolated from the oil outlet hole 4; when in an open state, one end of the valve core 8 is separated from the valve body 1, and the oil inlet hole 3 is communicated with the oil outlet hole 4.
The oil groove 7 is circumferentially arranged on the outer wall of the valve core 8, and the main control oil hole 5 is in conductive connection with an external oil supply device of the oil groove 7.
The auxiliary control oil hole 6 is arranged at one end of the valve body 1 far away from the oil inlet hole 3, and the auxiliary control oil hole 6 is connected with the mounting cavity 2 and the injection rear cavity of the external die casting device in a conducting mode.
With this structure, for convenience of description, the conduction area between the oil inlet 3 and the oil outlet 4 of the installation cavity 2, that is, the right part of the valve element 8 in the drawing is named as an oil inlet cavity, the conduction area between the oil groove 7 and the main control oil hole 5 is named as a main control cavity, and the conduction area between the installation cavity 2 and the auxiliary control oil hole 6, that is, the left part of the valve element 8 in the drawing is named as an auxiliary control cavity.
In the opening process of the one-way valve, an external oil supply device adds hydraulic oil into the oil groove 7 along the main control oil hole 5, the hydraulic oil pushes the valve core 8 to move, one end of the valve core 8 is separated from the valve body 1, the pre-opening is completed, the oil inlet hole 3 is communicated with the oil outlet hole 4, and the external oil supply device enters from the oil inlet hole 3 and then is output from the oil outlet hole 4. The hydraulic oil pushes the valve core through the oil groove 7, so that the effect of opening the one-way valve is achieved, the main oil way hydraulic oil entering through the oil inlet hole 3 does not need to push the valve core 8, pressure loss is avoided, and the output process is stable.
The one-way valve closing process, the hammer head of the injection device reaches the limit, the pressure of the injection rear cavity of the injection device gradually rises, and as the auxiliary control cavity is connected with the injection rear cavity of the injection device in a conducting manner, when the pressure of the injection rear cavity of the injection device is close to the oil inlet pressure of the oil inlet cavity, the pressure of the auxiliary control cavity is also close to the oil inlet pressure of the oil inlet cavity, at the moment, the external control valve controls the hydraulic oil in the main control cavity to be discharged, the hydraulic oil returns to the external oil supply device along the main control oil hole 5, and the valve core 8 is rapidly pushed to one side of the oil inlet hole 3 under the action of the oil discharge pressure difference of the elastic reset mechanism 9 and the main control cavity, so that one end of the valve core 8 is in contact sealing with the valve body 1.
By adopting the structure, hydraulic oil is introduced into the main control cavity in advance, and the valve core 8 is jacked up by the hydraulic oil, so that the hydraulic oil in a main oil way does not need to push the valve core 8 during oil feeding, thereby avoiding pressure loss, reducing the pressure building time of an external injection device and improving the injection speed of the external injection device; when the external injection device reaches a limit value, the pressure of the main control cavity is released, and the pressure of the auxiliary control cavity is larger than that of the oil inlet cavity, so that the effect of rapidly correlating the valve core 8 is achieved, the closing time is short, and the reaction is rapid. The invention has the advantages of active opening and quick closing.
Preferably, the valve body 1 includes an oil path block 10, a mounting groove, a valve sleeve 11 and a gland 12, the mounting groove is disposed in the oil path block 10, the valve sleeve 11 is disposed in the mounting groove, and one end of the gland 12 is connected to an opening end of the mounting groove and is matched with the oil path block 10 to fix the valve sleeve 11.
The mounting chamber 2 is formed by the cooperation of the inner end surface of the gland 12 and the inner end surface of the valve sleeve 11.
The valve sleeve 11 is provided with a first oil passing hole 11a, a second oil passing hole 11b and a third oil passing hole 11c, and the first oil passing hole 11a is connected with the inside of the valve sleeve 11 and the oil inlet hole 3 in a conducting manner; the second oil passing hole 11b is connected to the inside of the valve housing 11 and the oil outlet 4 in a conductive manner, and the third oil passing hole 11c is connected to the oil groove 7 and the main control oil hole 5 in a conductive manner.
The distance between the second oil passing hole 11b and one end of the valve sleeve 11, which is close to the oil inlet hole 3, is 3-8mm.
With the adoption of the structure, the valve core 8 is arranged in the installation cavity 2 formed by the cooperation of the valve sleeve 11 and the gland 12 and slides in the valve sleeve 11 along the axial direction, one end of the valve core 8, the first oil passing hole 11a and the second oil passing hole 11b are matched to complete the opening or closing of the one-way valve, the valve body 1 and the valve sleeve 11 are kept in close contact, good tightness is provided for the one-way valve, and the hydraulic oil in each cavity is ensured not to leak mutually. The distance between the second oil passing hole 11b and one end of the valve sleeve 11 is 3-8mm, so that the valve core 8 has larger conduction flow under a certain moving stroke.
Preferably, the valve housing 11 includes a connection sleeve 11d and a connection ring 11e, the connection ring 11e and the connection sleeve 11d are sequentially connected in an axial direction, and an inner diameter of the connection sleeve 11d is smaller than an inner diameter of the connection ring 11 e.
The inner diameter of the connecting sleeve 11d is matched with the outer diameter of the valve core 8, a positioning ring 8a is formed at one end, far away from the oil inlet hole 3, of the valve core 8, and the outer diameter of the positioning ring 8a is matched with the inner diameter of the connecting ring 11 e.
The oil groove 7 is formed by matching the connecting sleeve 11d, the connecting ring 11e, the valve sleeve 11, the positioning ring 8a and the valve core 8.
The first oil passing hole 11a is formed in the connecting sleeve 11d along the axial direction, and the second oil passing hole 11b is formed in the side wall of the connecting sleeve 11d along the circumferential direction.
The oil passage block 10 is provided with an annular first oil distribution groove 24 connected to the third oil passing hole 11c in a conductive manner.
By adopting the structure, the connecting sleeve 11d is tightly attached to the outer wall of the valve core 8, the connecting ring 11e is tightly attached to the positioning ring 8a, good sealing effect is guaranteed on both sides of the oil groove 7, good sealing performance is achieved, hydraulic oil can effectively push the valve core 8 in the oil groove 7, and accordingly the valve core 8 is opened to enable the oil inlet hole 3 and the oil outlet hole to be communicated.
The outer wall of the connecting sleeve 11d and the outer wall of the connecting ring 11e are provided with a plurality of annular grooves along the circumferential direction, so that an oil pad can be generated at the periphery of the valve core 8, the supporting effect is achieved, the sliding friction of the valve core 8 is reduced, and the valve core 8 is prevented from being blocked.
The first oil distribution groove 24 can play a role in diversion and drainage, and prevents the turbulence phenomenon of hydraulic oil.
Preferably, at least one second oil passing hole 11b is provided, the second oil passing hole 11b is provided along the circumferential direction of the valve housing 11, and an inner end surface of the oil path block 10 is provided with an annular second oil distribution groove 25 connected to the second oil passing hole 11b in a conductive manner.
With this structure, in this embodiment, four second oil passing holes 11b are provided, and every two oil passing holes are symmetrically distributed along the central axis of the valve housing 11.
The second oil passing holes 11b are circumferentially distributed and matched with the second oil distribution grooves 25, so that high-flow hydraulic oil can be introduced, and meanwhile, the hydraulic oil in the main path can be kept stable, and the turbulence phenomenon is avoided.
Preferably, a first connecting inclined plane is formed on the outer edge of one end, close to the oil inlet hole 3, of the valve core 8 in the circumferential direction, a limiting ring is formed on the inner end surface of the connecting sleeve 11d, and a second connecting inclined plane adapted to the first connecting inclined plane is arranged on one end of the limiting ring.
By adopting the structure, the valve core 8 is fixed through the matching of the first connecting inclined plane and the second connecting inclined plane, the end part of the valve core 8 is sealed, and the sealing effect between the valve core 8 and the valve sleeve 11 is improved.
Preferably, the connecting sleeve 11d is provided with a first sealing ring 13 and a second sealing ring 14 along the circumferential direction, and the first sealing ring 13 and the second sealing ring 14 are respectively located at two sides of the second oil passing hole 11 b.
The inner end of the oil path block 10 is provided with a connecting groove, one end of the connecting sleeve 11d is positioned in the connecting groove, and the first sealing ring 13 is arranged between the connecting sleeve 11d and the connecting groove.
The connecting ring 11e is provided with a third sealing ring 15 along the circumferential direction, and the second sealing ring 14 and the third sealing ring 15 are respectively located at two sides of the third oil passing hole 11 c.
By adopting the structure, the first sealing ring 13, the second sealing ring 14 and the third sealing ring 15 are matched, so that the valve sleeve 11 and the oil way block 10 are kept in close contact, the main oil inlet cavity, the main control cavity and the auxiliary control cavity are kept sealed, hydraulic oil cannot permeate between the cavities, the sealing effect of the valve core 8 is improved, and the moving accuracy of the valve core 8 is improved.
Preferably, a fourth sealing ring 16 is circumferentially arranged at one end of the gland 12 located in the installation cavity 2; the other end of the gland 12, which is close to the oil inlet hole 3, is provided with an oil passing notch 12a which is in conductive connection with the auxiliary control oil hole 6.
With the adoption of the structure, the gland 12 is in sealing connection with the oil circuit block 10 through the fourth sealing ring 16, so that the tightness of the auxiliary control cavity is ensured; the hydraulic oil enters or flows out of the auxiliary control cavity through the auxiliary control oil hole 6 and the oil passing notch 12a in a matched mode, the pressure in the auxiliary control cavity is increased when the hydraulic oil enters, the valve core 8 is pushed to move to close the one-way valve, the pressure in the auxiliary control cavity is reduced when the hydraulic oil flows out, and the valve core 8 is driven by the hydraulic oil in the main control cavity to move to open the one-way valve.
Preferably, the elastic return mechanism 9 is a telescopic spring connected between the mounting cavity 2 and the valve core 8.
By adopting the structure, the action of pushing and resetting the valve core 8 rapidly is realized through the pressure fit of the telescopic spring and the hydraulic oil in the auxiliary control cavity, the reaction speed of the check valve is improved, the time required by locking the valve core 8 is reduced, and the action of closing the check valve rapidly is realized.
A hydraulic system for a die casting machine, the system comprising a fast accumulator 17, a one-way control valve 18, a fast valve 19, a shot cylinder 20, a booster cylinder 21, a booster valve 22, a booster accumulator 23 and a die casting machine shot check valve 26 according to any one of claims 1 to 8.
The quick accumulator 17 is in conduction connection with the one-way control valve 18 and the quick valve 19 through a pipeline, the quick valve 19 is in conduction connection with the oil inlet 3 of the injection one-way valve 26 of the die casting machine through a pipeline, and the one-way control valve 18 is in conduction connection with the main control oil hole 5 of the injection one-way valve 26 of the die casting machine through a pipeline.
The oil outlet 4 of the injection check valve 26 of the die casting machine is connected with the injection post-cavity of the injection cylinder 20 in a conducting way through a pipeline, and the auxiliary control oil hole 6 of the injection check valve 18 of the die casting machine is connected with the injection post-cavity of the injection cylinder 20 in a conducting way through a pipeline.
The booster accumulator 23 is in conductive connection with the booster valve 22 through a pipeline, the booster valve 22 is connected with the booster cylinder 21 through a pipeline, and the output end of the booster cylinder 21 is connected with a pushing piston arranged in the injection post-injection cavity of the injection cylinder 20.
With this structure, when the hydraulic system is in a stationary state, the one-way control valve 18 is opened, the quick valve 19 is closed, and hydraulic oil from the quick accumulator 17 passes through the one-way control valve 18 to enter the main control oil hole 5 and push the valve spool 8 to open.
When the hydraulic system is in the injection state, the one-way control valve 18 is kept in an open state, the quick valve 19 is opened, hydraulic oil flows from the quick accumulator 17 to the oil inlet hole 3 through the quick valve 19, and then the hydraulic oil flows out of the oil outlet and enters the injection rear cavity of the injection cylinder 20 and pushes the piston of the injection cylinder 20.
When the hydraulic system is in a pressurized state, hydraulic oil enters the pressurizing oil cylinder 21 from the pressurizing energy accumulator 23 through the pressurizing valve 22, the output end of the pressurizing oil cylinder 21 pushes the piston, and the pressure of the injection cavity of the injection oil cylinder 20 is increased.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (9)

1. The injection one-way valve of the die casting machine is characterized by comprising a valve body, a mounting cavity, an oil inlet hole, an oil outlet hole, a main control oil hole, an auxiliary control oil hole, an oil groove, a valve core and an elastic reset mechanism;
the valve core is movably arranged in the mounting cavity along the axial direction;
the oil inlet hole is arranged along the axial direction of the valve core and is in conductive connection with the mounting cavity and an external oil supply device; the oil outlet is communicated with the mounting cavity and the injection rear cavity of the external die casting device;
one end of the valve core is opposite to the oil inlet hole, and the elastic reset mechanism is connected between the other end of the valve core and the mounting cavity;
when the valve is in a closed state, one end of the valve core is in contact sealing with the valve body, and the oil inlet hole is isolated from the oil outlet hole; when in an open state, one end of the valve core is separated from the valve body, and the oil inlet hole is communicated with the oil outlet hole;
the oil groove is arranged on the outer wall of the valve core along the circumferential direction, and the main control oil hole is connected with the oil groove and an external oil supply device in a conducting manner;
the auxiliary control oil hole is arranged at one end of the valve body, which is far away from the oil inlet hole, and the auxiliary control oil hole is connected with the mounting cavity and the injection rear cavity of the external die casting device in a conducting manner.
2. The injection one-way valve of the die casting machine according to claim 1, wherein the valve body comprises an oil path block, a mounting groove, a valve sleeve and a gland, the mounting groove is arranged in the oil path block, the valve sleeve is arranged in the mounting groove, one end of the gland is connected with the opening end of the mounting groove and is matched with the oil path block to fix the valve sleeve;
the mounting cavity is formed by matching an inner end surface of the gland and an inner end surface of the valve sleeve;
the valve sleeve is provided with a first oil passing hole, a second oil passing hole and a third oil passing hole, and the first oil passing hole is connected with the inside of the valve sleeve and the oil inlet hole in a conducting manner; the second oil passing hole is connected with the inside of the valve sleeve and the oil outlet in a conducting manner, and the third oil passing hole is connected with the oil groove and the main control oil hole in a conducting manner;
the distance between the second oil passing hole and one end of the valve sleeve, which is close to the oil inlet hole, is 3-8mm.
3. The injection one-way valve of a die casting machine according to claim 2, wherein the valve sleeve comprises a connecting sleeve and a connecting ring, the connecting ring and the connecting sleeve are sequentially connected along the axial direction, and the inner diameter of the connecting sleeve is smaller than the inner diameter of the connecting ring;
the inner diameter of the connecting sleeve is matched with the outer diameter of the valve core, a positioning ring is formed at one end of the valve core, which is far away from the oil inlet hole, and the outer diameter of the positioning ring is matched with the inner diameter of the connecting ring;
the oil groove is formed by matching the connecting sleeve, the connecting ring, the valve sleeve, the positioning ring and the valve core;
the first oil passing hole is formed in the connecting sleeve along the axial direction, and the second oil passing hole is arranged on the side wall of the connecting sleeve along the circumferential direction;
the oil way block is provided with an annular first oil distribution groove which is connected with the third oil passing hole in a conducting way.
4. The injection check valve of claim 2, wherein at least one second oil passing hole is formed in the second oil passing hole, the second oil passing hole is formed in the circumferential direction of the valve sleeve, and an annular second oil distribution groove in conductive connection with the second oil passing hole is formed in the inner end surface of the oil path block.
5. The injection one-way valve of claim 3, wherein a first connecting inclined plane is formed on the outer edge of one end of the valve core, which is close to the oil inlet hole, in the circumferential direction, a limiting ring is formed on the inner end surface of the connecting sleeve, and a second connecting inclined plane which is adaptive to the first connecting inclined plane is arranged on one end of the limiting ring.
6. The injection one-way valve of claim 3, wherein the connecting sleeve is provided with a first sealing ring and a second sealing ring along the circumferential direction, and the first sealing ring and the second sealing ring are respectively positioned at two sides of the second oil passing hole;
the inner end of the oil way block is provided with a connecting groove, one end of the connecting sleeve is positioned in the connecting groove, and the first sealing ring is arranged between the connecting sleeve and the connecting groove;
the connecting ring is provided with a third sealing ring along the circumferential direction, and the second sealing ring and the third sealing ring are respectively positioned at two sides of the third oil passing hole.
7. The injection one-way valve of a die casting machine according to claim 2, wherein a fourth sealing ring is circumferentially arranged at one end of the gland in the mounting cavity; and an oil passing notch which is connected with the auxiliary control oil hole in a conducting way is formed in the other end of the gland close to the oil inlet hole.
8. The injection check valve of claim 1, wherein the resilient return mechanism is a telescoping spring connected between the mounting cavity and the valve core.
9. A hydraulic system of a die casting machine, which is characterized by comprising a rapid energy accumulator, a one-way control valve, a rapid valve, a shot oil cylinder, a booster valve, a booster energy accumulator and the shot one-way valve of the die casting machine as claimed in any one of claims 1 to 8;
the quick energy accumulator is in conductive connection with the one-way control valve and the quick valve through pipelines, the quick valve is in conductive connection with an oil inlet hole of the injection one-way valve of the die casting machine through pipelines, and the one-way control valve is in conductive connection with a main control oil hole of the injection one-way valve of the die casting machine through pipelines;
the oil outlet of the injection one-way valve of the die casting machine is in conductive connection with the injection rear cavity of the injection oil cylinder through a pipeline, and the auxiliary control oil hole of the injection one-way valve of the die casting machine is in conductive connection with the injection rear cavity of the injection oil cylinder through a pipeline;
the pressure boosting energy accumulator is connected with the pressure boosting valve in a conducting way through a pipeline, the pressure boosting valve is connected with the pressure boosting oil cylinder through a pipeline, and the output end of the pressure boosting oil cylinder is connected with a pushing piston arranged in a post-injection cavity of the injection oil cylinder.
CN201910960326.1A 2019-10-10 2019-10-10 Injection check valve of die casting machine and die casting machine hydraulic system using same Active CN110701345B (en)

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CN111730292A (en) * 2020-06-30 2020-10-02 浙江金森机械有限公司 Efficient production process of overflow valve sleeve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025857A (en) * 1999-07-15 2001-01-30 Toshiba Mach Co Ltd Injection device in die casting machine and injection controlling method thereof
CN101108412A (en) * 2007-07-10 2008-01-23 宁波东方压铸机床有限公司 Injection oilchannel device of hot room die casting machine
CN102205407A (en) * 2011-04-20 2011-10-05 常州华晨机械制造有限公司 One-way valve injection device for die casting machine
CN211175507U (en) * 2019-10-10 2020-08-04 广东伊之密精密机械股份有限公司 Injection check valve of die casting machine and die casting machine hydraulic system applying injection check valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025857A (en) * 1999-07-15 2001-01-30 Toshiba Mach Co Ltd Injection device in die casting machine and injection controlling method thereof
CN101108412A (en) * 2007-07-10 2008-01-23 宁波东方压铸机床有限公司 Injection oilchannel device of hot room die casting machine
CN102205407A (en) * 2011-04-20 2011-10-05 常州华晨机械制造有限公司 One-way valve injection device for die casting machine
CN211175507U (en) * 2019-10-10 2020-08-04 广东伊之密精密机械股份有限公司 Injection check valve of die casting machine and die casting machine hydraulic system applying injection check valve

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