CN218227749U - High-response injection hydraulic circuit of injection molding machine - Google Patents
High-response injection hydraulic circuit of injection molding machine Download PDFInfo
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- CN218227749U CN218227749U CN202221888065.0U CN202221888065U CN218227749U CN 218227749 U CN218227749 U CN 218227749U CN 202221888065 U CN202221888065 U CN 202221888065U CN 218227749 U CN218227749 U CN 218227749U
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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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76595—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76685—Injection unit accumulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a high-response injection hydraulic circuit of an injection molding machine, which comprises a motor, a hydraulic pump, an oil tank, an injection oil cylinder, a screw, a glue melting motor, a first electro-hydraulic reversing valve and a second electro-hydraulic reversing valve; the oil-saving control system also comprises a pilot oil way connected with the oil inlet pipeline, and the pilot oil way is connected with a pressure reducing valve and an energy accumulator; an oil inlet of the pressure reducing valve is connected with an oil inlet pipeline, and an oil outlet of the pressure reducing valve is connected with an oil inlet of the energy accumulator; an oil outlet of the energy accumulator is respectively connected with pilot valves of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve through pilot oil paths; the oil outlet of the first electro-hydraulic reversing valve is connected with the oil outlet of the second electro-hydraulic reversing valve; the utility model discloses set up the pilot oil circuit, first electric liquid switching-over valve, the second electric liquid switching-over valve of glue and melten gel are penetrated in control is connected through the pilot oil circuit all the time, opens main valve core when the pilot valve electro-magnet of first electric liquid switching-over valve, second electric liquid switching-over valve is got electric, has shortened the opening time of electric liquid switching-over valve, reduces the energy consumption when improving response speed.
Description
Technical Field
The utility model relates to an injection molding machine oil circuit control technical field especially relates to a high response injection hydraulic circuit of injection molding machine.
Background
At present, an injection molding machine can be divided into a hydraulic injection molding machine and a full-electric injection molding machine from a power system, the hydraulic injection molding machine is most widely applied by a servo pump technology, the principle is that a servo motor drives an oil pump to output pressure oil according to the instruction and the load condition of a controller, the pressure oil is directly conveyed to a hydraulic cylinder or a control element through a longer hydraulic pipeline and then reaches the hydraulic cylinder to realize each action of the injection molding machine, and the problems of slow injection response and the like are caused due to the fact that the pressure oil passes through the longer hydraulic pipeline and the pressure loss along the way and the additional pipeline filling time are caused; especially for injection molding of thin-walled plastic articles, very high injection speeds are usually required, injection response is a very critical performance criterion, and generally faster injection response makes injection molding easier and requires less mold clamping force.
The traditional injection circuit has no pilot control branch, can not realize early acceleration before injection, can only accelerate from zero to a set value after the injection action starts, has low injection response speed and influences the injection performance.
Disclosure of Invention
Therefore, in order to solve the problems existing in the prior art, the utility model aims to provide a high-response injection hydraulic circuit of an injection molding machine, which is characterized in that a first electro-hydraulic reversing valve and a second electro-hydraulic reversing valve for controlling glue injection and glue melting are always connected through a pilot oil circuit by setting a pilot oil circuit, pilot electromagnets of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve are electrified, and simultaneously, a main valve core is opened, so that the opening time of the electro-hydraulic reversing valves is shortened, and the response speed is greatly improved; and a simultaneous control mode is adopted, so that the sensitivity is high, and the control flow is more stable.
The purpose of the utility model is realized by adopting the following technical scheme:
a high-response injection hydraulic circuit of an injection molding machine comprises a motor, a hydraulic pump, an oil tank, an injection oil cylinder, a screw, a glue melting motor, a first electro-hydraulic reversing valve and a second electro-hydraulic reversing valve; the motor and the hydraulic pump are connected with the oil tank and are used for controlling the output of pressure oil; the first electro-hydraulic directional valve is connected with the motor, the hydraulic pump, the oil tank and the injection oil cylinder through an oil inlet pipeline; the second electro-hydraulic reversing valve is connected with the glue melting motor and used for driving the screw rod; the oil return pipeline is used for returning oil of the injection oil cylinder and the glue melting motor to the oil tank; the system also comprises a pilot oil way connected with the oil inlet pipeline, and the pilot oil way is connected with a pressure reducing valve and an energy accumulator for pressure regulation; an oil inlet of the pressure reducing valve is connected with the oil inlet pipeline, and an oil outlet of the pressure reducing valve is connected with an oil inlet of the energy accumulator; an oil outlet of the energy accumulator is respectively connected with pilot valves of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve through the pilot oil path; and the oil outlet of the first electro-hydraulic reversing valve is connected with the oil outlet of the second electro-hydraulic reversing valve.
As a further improvement of the scheme, the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve are three-position four-way electro-hydraulic reversing valves, and a main valve core of the first electro-hydraulic reversing valve comprises an oil inlet P1, an oil outlet A1, an oil outlet B1 and an oil return port T1; the main valve core of the second electro-hydraulic reversing valve comprises an oil inlet P2, an oil outlet A2, an oil outlet B2 and an oil return port T2; the oil inlet P1 and the oil inlet P2 are both connected with the oil inlet pipeline; and the oil return port T1 and the oil return port T2 are connected with the oil return pipeline.
As a further improvement of the scheme, an oil outlet A1 of the first electro-hydraulic reversing valve is connected with a releasing cavity of the injection oil cylinder, an oil outlet B1 of the first electro-hydraulic reversing valve and an oil outlet B2 of the second electro-hydraulic reversing valve are connected with an injection cavity of the injection oil cylinder; and an oil outlet A2 of the second electro-hydraulic reversing valve is connected with an oil inlet of the glue melting motor, and an oil outlet of the glue melting motor is connected with the oil return pipeline. The two valves are connected in parallel, so that the oil passing amount during injection is improved.
As a further improvement of the scheme, the pressure reducing valve is a superposition type pressure reducing valve; the overlapped pressure reducing valve comprises an oil inlet P3, an oil outlet A3, an oil outlet B3 and an oil return port T3; the oil inlet P3 is connected with the oil inlet pipeline; the oil return port T3 is connected with the oil return pipeline; the oil outlet A3 is connected with the pilot oil way.
As a further improvement of the scheme, a check valve is arranged between the pressure reducing valve and the energy accumulator.
As a further improvement of the scheme, the high-response injection hydraulic circuit is also provided with a stop valve; the stop valve is connected with the pilot oil way and the oil return pipeline.
As a further improvement of the scheme, a pressure gauge for displaying the pressure value of the pilot oil way is further arranged on the pilot oil way.
As a further improvement of the scheme, the hydraulic control system further comprises a controller for controlling the high-response injection hydraulic circuit.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the utility model discloses a set up the pilot oil circuit, the first electricity liquid switching-over valve of glue and melten gel is penetrated in the control, the second electricity liquid switching-over valve is connected through the pilot oil circuit all the time, opens the main valve core when the pilot valve electro-magnet of first electricity liquid switching-over valve, second electricity liquid switching-over valve is electrified, has shortened the opening time of electricity liquid switching-over valve, has improved response speed greatly; the simultaneous control mode is adopted, so that the sensitivity is high, and the control flow is more stable;
2. in addition, an energy accumulator is arranged on the pilot oil path and is matched with the pilot oil path to keep a certain pressure on control pressure ports of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve all the time, when an electromagnet at one end of the pilot oil path is electrified, pressure oil opens the main valve core through the pilot valve to complete opening of the oil path, energy consumption is reduced, meanwhile, advance acceleration is realized, opening efficiency of the electro-hydraulic reversing valves is further improved, and response speed is guaranteed;
3. the utility model discloses set up the relief pressure valve, conveniently adjust the pressure to the pilot oil of electro-hydraulic directional control valve, cooperate the manometer, real-time response and adjust the pressure through the pilot oil circuit according to required pressure size, make the pressure of pilot oil circuit more stable, just so guarantee the stability of electro-hydraulic directional control valve switching-over, the injection molding machine is moulded plastics with invariable pressure and predetermined speed when moulding plastics, greatly reduced hydraulic pressure oil circuit's control energy consumption when the injection molding quality is higher;
4. the utility model adopts the pilot oil circuit to replace the control of a plurality of pilot valves in the prior art, changes the layout and the connection mode of the electro-hydraulic directional valve, reduces and shortens the connection of external pipelines, and leads the design of the oil circuit to be more compact and simple and the production cost to be low; meanwhile, the response speed is higher, and the injection quality is improved;
5. two in the utility model the electricity liquid switching-over valve is parallelly connected, the oil mass of crossing when being favorable to improving the injection.
Drawings
Fig. 1 is a schematic diagram illustrating a control principle of a high-response injection hydraulic circuit according to a preferred embodiment of the present invention.
In the figure: 1. a motor; 2. a hydraulic pump; 3. an oil tank; 4. an injection oil cylinder; 41. an injection cavity; 42. loosening and withdrawing the cavity; 5. a screw; 6. a melt adhesive motor; 7. a first electro-hydraulic directional valve; 8. a second electro-hydraulic directional valve; 9. a pressure reducing valve; 10. an accumulator; 11. a non-return valve; 12. a stop valve; 13. a pressure gauge; 14. a controller; a. an oil inlet pipeline; b. an oil return line; c. the pilot oil path.
Detailed Description
In order to facilitate understanding of the present invention, the technical solution and advantages of the high-response injection hydraulic circuit of the present invention will be described in further detail with reference to the accompanying drawings and embodiments. The specific structure and features of the high-response injection hydraulic circuit are described below by way of example and should not constitute any limitation to the present invention. Also, any technical features mentioned (including implicit or explicit) below, as well as any technical features shown or implicit in the drawings, may be continued to be combined or deleted arbitrarily between them, thereby forming more other embodiments that may not be mentioned directly or indirectly in the present disclosure. The preferred embodiments of the present invention are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, unless otherwise specified, the terms "top", "bottom", "left", "right", "relative" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1, a high-response injection hydraulic circuit of an injection molding machine comprises a motor 1, a hydraulic pump 2, an oil tank 3, an injection oil cylinder 4, a screw 5, a glue melting motor 6, a first electro-hydraulic directional valve 7 and a second electro-hydraulic directional valve 8; the motor 1 and the hydraulic pump 2 are connected with the oil tank 3 and are used for controlling the output of pressure oil; the first electro-hydraulic directional valve 7 is connected with the motor 1, the hydraulic pump 2, the oil tank 3 and the injection oil cylinder 4 through an oil inlet pipeline a; the second electro-hydraulic reversing valve 8 is connected with the glue melting motor 6 and used for driving the screw 5 to rotate; the oil return pipeline b is used for returning oil of the injection oil cylinder 4 and the glue melting motor 6 to the oil tank 3; the oil-saving device also comprises a pilot oil path c connected with the oil inlet pipeline a, wherein a pressure reducing valve 9 and an energy accumulator 10 for pressure regulation are connected to the pilot oil path c; an oil inlet of the pressure reducing valve 9 is connected with the oil inlet pipeline a, and an oil outlet of the pressure reducing valve 9 is connected with an oil inlet of the energy accumulator 10; an oil outlet of the energy accumulator 10 is respectively connected with pilot valves of the first electro-hydraulic reversing valve 7 and the second electro-hydraulic reversing valve 8 through the pilot oil path c; and an oil outlet of the first electro-hydraulic reversing valve 7 is connected with an oil outlet of the second electro-hydraulic reversing valve 8.
In the embodiment, the energy accumulator is arranged as a pressure holding device, is communicated with an oil way and continuously provides pressure, and the opening efficiency of the electro-hydraulic reversing valve is improved. Preferably, the utility model discloses a bag formula energy storage ware, its mounting means does not make the restriction, as long as it can realize corresponding beneficial effect can.
The utility model is provided with the pilot oil path, the first electro-hydraulic reversing valve 7 and the second electro-hydraulic reversing valve 8 for controlling the glue injection and the glue melting are always connected through the pilot oil path c, and the main valve core is opened while pilot electromagnets of the first electro-hydraulic reversing valve 7 and the second electro-hydraulic reversing valve 8 are electrified, so that the opening time of the electro-hydraulic reversing valves is shortened, and the response speed is greatly improved; the simultaneous control mode is adopted, so that the sensitivity is high, and the control flow is more stable;
in addition, an energy accumulator is arranged on the pilot oil path and is matched with the pilot oil path to keep a certain pressure on control pressure ports of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve all the time, when an electromagnet at one end of the pilot oil path is electrified, pressure oil opens the main valve core through the pilot valve to complete opening of the oil path, energy consumption is reduced, meanwhile, advance acceleration is realized, opening efficiency of the electro-hydraulic reversing valves is further improved, and response speed is guaranteed;
the utility model adopts the pilot oil circuit to replace the control of a plurality of groups of pilot valves in the prior art, changes the layout and the connection mode of the electro-hydraulic directional valves, reduces and shortens the connection of external pipelines, and leads the design of the oil circuit to be more compact and simpler and the production cost to be low; meanwhile, the response speed is higher, and the injection quality is improved.
As a further preferred scheme, the first electro-hydraulic reversing valve 7 and the second electro-hydraulic reversing valve 8 are both three-position four-way electro-hydraulic reversing valves, and a main valve element of the first electro-hydraulic reversing valve 7 comprises an oil inlet P1, an oil outlet A1, an oil outlet B1 and an oil return port T1; the main valve element of the second electro-hydraulic reversing valve 8 comprises an oil inlet P2, an oil outlet A2, an oil outlet B2 and an oil return port T2; the oil inlet P1 and the oil inlet P2 are both connected with the oil inlet pipeline; and the oil return port T1 and the oil return port T2 are connected with the oil return pipeline.
In the embodiment, the working principle of the first electro-hydraulic reversing valve 7 and the second electro-hydraulic reversing valve 8 refers to the working principle of a three-position four-way electro-hydraulic reversing valve in the prior art, and when an electromagnet on the left side of a pilot valve is electrified, an opening P of a main valve core is communicated with an oil path of A, and an oil path of B is communicated with an oil path of T; on the contrary, when the electromagnet on the right side of the pilot valve is electrified, the oil port P is communicated with the oil port B, and the oil ports A are communicated with the oil path of the oil port T.
As a further preferred scheme, an oil outlet A1 of the first electro-hydraulic directional valve 7 is connected with a loosening and withdrawing cavity 42 of the injection oil cylinder 4, and a pipeline of the oil outlet B1 of the first electro-hydraulic directional valve 7 is divided into two branches which are respectively connected with an injection cavity 41 of the injection oil cylinder 4 and an oil outlet B2 of the second electro-hydraulic directional valve 8; an oil outlet A2 of the second electro-hydraulic reversing valve 8 is connected with an oil inlet of the glue melting motor 6, and an oil outlet of the glue melting motor 6 is connected with the oil return pipeline b.
In the embodiment, the controller sends a control signal to enable a right electromagnet of a pilot valve of the second electro-hydraulic reversing valve to be electrified, and meanwhile, a main valve core is opened, and pressure oil flows to the glue melting motor through an oil outlet A2; after the glue melting step is finished, the controller sends a control signal, the right electromagnet of the first electro-hydraulic reversing valve is electrified, pressure oil flows to a releasing cavity of the injection oil cylinder through an oil outlet A1, oil in the injection cavity flows back to an oil tank through B1 and T1 to perform releasing action, the releasing step is finished, the controller sends the control signal, the right electromagnet of the first electro-hydraulic reversing valve is electrified, and the pressure oil flows to the injection cavity of the injection oil cylinder through an oil outlet B1 to perform glue injection action.
In the embodiment, plastic is conveyed to the front end of the screw from a feed opening (not shown in the figure) by the screw during glue melting, the plastic at the front end of the screw generates pressure and pushes the screw backwards, the first electro-hydraulic reversing valve is in a middle position at the moment, T1 is switched on for A1, and B1 is cut off; the second electro-hydraulic reversing valve is electrified at the right side, P2 is connected with A2, and B2 is connected with T2; when the screw rod moves backwards, the piston of the injection oil cylinder is pushed to move backwards, and the oil in the injection cavity returns to the oil tank through the B2 and the T2.
In the embodiment, the two electro-hydraulic reversing valves are connected in parallel, so that the improvement of the oil passing amount during injection is facilitated.
As a further preferable scheme, the pressure reducing valve 9 is a superposition type pressure reducing valve; the overlapped pressure reducing valve comprises an oil inlet P3, an oil outlet A3, an oil outlet B3 and an oil return port T3; the oil inlet P3 is connected with the oil inlet pipeline a; the oil return port T3 is connected with the oil return pipeline b; the oil outlet A3 is connected with the pilot oil path c. In the present embodiment, the pressure reducing valve is a superposition type pressure reducing valve purchased from Rexroth, germany, and the working principle of the pressure reducing valve refers to the working principle of the superposition type pressure reducing valve in the prior art.
The utility model discloses set up stack formula relief pressure valve conveniently adjusts the pressure to electro-hydraulic directional valve pilot oil, and the cooperation manometer, real-time response adjusts the pressure through the pilot oil circuit according to required pressure size, makes the pressure of pilot oil circuit more stable, just so guarantees the stability that electro-hydraulic directional valve commutates, and the injection molding machine is moulded plastics with invariable pressure and predetermined speed when moulding plastics, the control energy consumption of greatly reduced hydraulic pressure oil circuit when the quality of moulding plastics is higher. Through long-term practice, the utility model discloses compare prior art's hydraulic circuit's whole energy consumption and descend more than 1/4.
Preferably, a check valve 11 is provided between the pressure reducing valve 9 and the accumulator 10. The check valve 11 is provided to perform a one-way control function on the pilot oil path c, thereby preventing pressure loss due to internal leakage of the stack type pressure reducing valve.
As a further preferable scheme, the high-response injection hydraulic circuit is also provided with a stop valve 12; the stop valve 12 is connected with the pilot oil path c and the oil return line b. In this embodiment, the stop valve is provided to open the stop valve 12 to release the pressure in the pilot oil path when the pilot oil path needs to be maintained, so as to prevent the internal pressure of the accumulator 10 from causing hydraulic oil leakage or injury to the operator.
Preferably, a pressure gauge 13 for displaying a pressure value of the pilot oil path c is further disposed on the pilot oil path c. The pressure gauge 13 is arranged to display the pressure value of the pilot oil path, and the pressure of the pilot oil path can be set by adjusting the pressure of the stacked pressure reducing valve.
As a further preferable solution, the hydraulic circuit of the present invention further includes a controller 14 for controlling the high-response injection hydraulic circuit.
The speed-up principle of the injection hydraulic circuit of the utility model is that pressure oil enters a pilot oil circuit through an oil inlet pipeline, the pressure reducing valve fills liquid into the energy accumulator, the pressure oil respectively passes through the pilot valves of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve, and the magnet of the pilot valve is electrified to open the main valve core to perform injection action or glue melting action;
the utility model discloses injection hydraulic circuit's control process as follows:
(1) And setting: setting relevant parameters on the controller interface;
(2) And liquid filling: the controller sends a control signal, the motor drives the hydraulic pump to rotate, the pressure oil fills the accumulator, and the pressure oil is unloaded through the pressure reducing valve after reaching a set value; at the moment, the pilot oil way keeps certain pressure on a pilot oil port of the first electro-hydraulic reversing valve and a pilot oil port of the second electro-hydraulic reversing valve;
(3) Melting glue: the controller sends a control signal to enable a right electromagnet of a pilot valve of the second electro-hydraulic reversing valve to be electrified, and meanwhile, the main valve core is opened, and pressure oil flows to the glue melting motor through the oil outlet A2;
(4) Loosening: after the step of melting the rubber is finished, the controller sends a control signal, the right electromagnet of the first electro-hydraulic reversing valve is electrified, pressure oil flows to the releasing cavity of the injection oil cylinder through the oil outlet A1, and oil in the injection cavity flows back to the oil tank through the oil outlet B1 and the oil outlet T1 to perform releasing action.
(5) Injecting glue: after the loosening step is finished, the controller sends a control signal to enable the left electromagnet of the first electro-hydraulic reversing valve to be electrified, pressure oil flows to an injection cavity of the injection oil cylinder through the oil outlet B1 to perform glue injection action, and meanwhile oil of the glue melting motor is controlled to flow back to the oil tank.
Namely, the melt rubber is used as the middle position of the first electro-hydraulic reversing valve, and the second electro-hydraulic reversing valve is powered on right; the loosening and the reversing are used as the right power of the first electro-hydraulic reversing valve and the middle position of the second electro-hydraulic reversing valve; the injection brake is used as a left-hand power supply of the first electro-hydraulic reversing valve, and a middle position of the second electro-hydraulic reversing valve.
The above-described embodiments are merely preferred embodiments of the present invention, and the scope of the present invention should not be limited thereto, and it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principle and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims (8)
1. A high-response injection hydraulic circuit of an injection molding machine comprises a motor, a hydraulic pump, an oil tank, an injection oil cylinder, a screw, a glue melting motor, a first electro-hydraulic reversing valve and a second electro-hydraulic reversing valve; the motor and the hydraulic pump are connected with the oil tank and used for controlling the output of pressure oil; the first electro-hydraulic directional valve is connected with the motor, the hydraulic pump, the oil tank and the injection oil cylinder through an oil inlet pipeline; the second electro-hydraulic reversing valve is connected with the glue melting motor and used for driving the screw rod; the oil return pipeline is used for returning oil of the injection oil cylinder and the glue melting motor to the oil tank; the system is characterized by also comprising a pilot oil way connected with the oil inlet pipeline, wherein the pilot oil way is connected with a pressure reducing valve and an energy accumulator for pressure regulation; an oil inlet of the pressure reducing valve is connected with the oil inlet pipeline, and an oil outlet of the pressure reducing valve is connected with an oil inlet of the energy accumulator; an oil outlet of the energy accumulator is respectively connected with pilot valves of the first electro-hydraulic reversing valve and the second electro-hydraulic reversing valve through the pilot oil path; and the oil outlet of the first electro-hydraulic reversing valve is connected with the oil outlet of the second electro-hydraulic reversing valve.
2. The high-response injection hydraulic circuit of claim 1, wherein the first electro-hydraulic directional control valve and the second electro-hydraulic directional control valve are three-position four-way electro-hydraulic directional control valves, and the main valve element of the first electro-hydraulic directional control valve comprises an oil inlet P1, an oil outlet A1, an oil outlet B1 and an oil return port T1; the main valve element of the second electro-hydraulic reversing valve comprises an oil inlet P2, an oil outlet A2, an oil outlet B2 and an oil return port T2; the oil inlet P1 and the oil inlet P2 are both connected with the oil inlet pipeline; and the oil return port T1 and the oil return port T2 are connected with the oil return pipeline.
3. The high-response injection hydraulic circuit of claim 2, wherein an oil outlet A1 of the first electro-hydraulic directional valve is connected with a release cavity of the injection cylinder, an oil outlet B1 of the first electro-hydraulic directional valve, and an oil outlet B2 of the second electro-hydraulic directional valve is connected with an injection cavity of the injection cylinder; and an oil outlet A2 of the second electro-hydraulic reversing valve is connected with an oil inlet of the glue melting motor, and an oil outlet of the glue melting motor is connected with the oil return pipeline.
4. The high response injection hydraulic circuit of claim 1, wherein the pressure relief valve is a stack pressure relief valve; the overlapped pressure reducing valve comprises an oil inlet P3, an oil outlet A3, an oil outlet B3 and an oil return port T3; the oil inlet P3 is connected with the oil inlet pipeline; the oil return port T3 is connected with the oil return pipeline; the oil outlet A3 is connected with the pilot oil way.
5. The high response injection hydraulic circuit of claim 1, wherein a check valve is disposed between the pressure reducing valve and the accumulator.
6. The high-response hydraulic injection circuit of claim 1, further comprising a shut-off valve; the stop valve is connected with the pilot oil way and the oil return pipeline.
7. The high response injection hydraulic circuit of claim 1, wherein a pressure gauge for displaying a pressure value of the pilot oil path is further provided on the pilot oil path.
8. The high-response hydraulic injection circuit of claim 1, further comprising a controller for controlling the high-response hydraulic injection circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259626.0A CN113843996A (en) | 2021-10-28 | 2021-10-28 | High-response injection hydraulic circuit of injection molding machine and pilot control method |
| CN2021112596260 | 2021-10-28 |
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| CN218227749U true CN218227749U (en) | 2023-01-06 |
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| CN202221888065.0U Active CN218227749U (en) | 2021-10-28 | 2022-07-21 | High-response injection hydraulic circuit of injection molding machine |
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|---|---|---|---|---|
| CN202764155U (en) * | 2012-01-11 | 2013-03-06 | 博创机械股份有限公司 | Servo valve control injection oil path system of large injection molding machine |
| CN204687294U (en) * | 2015-05-12 | 2015-10-07 | 广东联升精密机械制造有限公司 | And combined stream injection control loop |
| CN205033541U (en) * | 2015-08-28 | 2016-02-17 | 震雄机械（深圳）有限公司 | Injection molding machine and plastify unit hydraulic control device thereof |
| CN205744634U (en) * | 2016-07-06 | 2016-11-30 | 宁波创基机械有限公司 | A kind of improve injection machine folding mould and the device of action of injection performance |
| CN206690501U (en) * | 2016-09-27 | 2017-12-01 | 广东伊之密精密注压科技有限公司 | The injection oil piping system of two triggers |
| CN206953495U (en) * | 2017-07-07 | 2018-02-02 | 宁波巴斯顿机械科技有限公司 | A kind of high response open mold hydraulic system |
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