CN219276566U - Injection molding machine open-close die electrohydraulic reversing valve adjusting loop with shuttle valve - Google Patents
Injection molding machine open-close die electrohydraulic reversing valve adjusting loop with shuttle valve Download PDFInfo
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- CN219276566U CN219276566U CN202320260321.XU CN202320260321U CN219276566U CN 219276566 U CN219276566 U CN 219276566U CN 202320260321 U CN202320260321 U CN 202320260321U CN 219276566 U CN219276566 U CN 219276566U
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The utility model relates to an electro-hydraulic reversing valve adjusting loop with a shuttle valve for an injection molding machine opening and closing die, which is applied to the field of control of opening and closing die actions of injection molding machines and comprises an electro-hydraulic reversing valve, a shuttle valve, a hydraulic cylinder, an analog load, a differential valve, an oil tank and a valve block; wherein the electrohydraulic reversing valve, the hydraulic cylinder, the differential valve and the oil tank are connected in sequence to form a die opening and closing action loop; the front end of a pilot control oil way of the electrohydraulic reversing valve is added with a shuttle valve control oil way, and the higher-pressure oil in two cavities of the hydraulic cylinder after comparison by the shuttle valve is used as pilot-level control oil of the electrohydraulic reversing valve to form a loop for preventing the die-closing error of the electrohydraulic reversing valve, and a valve block is designed for realizing the functions; the problem of the electro-hydraulic reversing valve that the main oil circuit pressure is inhaled to empty and is caused in the mould opening and closing process is effectively solved, and the problem of oil circuit impact caused by pressure re-establishment after the mistaken closing is solved, and meanwhile the electro-hydraulic reversing valve has certain significance in prolonging the service life of the electro-hydraulic reversing valve and improving the stability of a system.
Description
Technical Field
The utility model belongs to the technical field of injection molding machines, and particularly relates to an adjusting loop of an electro-hydraulic reversing valve with a shuttle valve for opening and closing a mold of an injection molding machine.
Background
At present, when the servo driving type injection molding machine works, the output flow of a pump is controlled mainly by adjusting the rotating speed of a servo motor, and the switching of the die closing and opening actions is realized through an electrohydraulic reversing valve, in the die closing action, when the differential action of a hydraulic cylinder is switched to the normal working action, the hydraulic cylinder and a movable die plate still move forwards at a higher speed due to the inertia action, so that the oil inlet cavity of an oil cylinder is locally sucked, and the oil pressure of a main oil way is instantaneously zero.
The existing electro-hydraulic reversing valves generally adopt an internal control oil way, when the main oil way has instantaneous zero pressure, the electro-hydraulic reversing valve can be closed by mistake, so that the flow output by a pump cannot be filled into an oil cylinder chamber, and when the pressure of the main oil way is recovered, the electro-hydraulic reversing valve is opened again to work; the hydraulic impact can be generated in the process of mistakenly closing and reopening the electrohydraulic reversing valve, so that the stability of die assembly action is influenced, the service life is prolonged, the whole die assembly working period is prolonged, and the production operation efficiency is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides an adjusting loop of an electro-hydraulic reversing valve for an open-close die of an injection molding machine with a shuttle valve, which solves the problem that the electro-hydraulic reversing valve is closed or re-opened by mistake in die assembly of the injection molding machine, avoids the phenomenon of service life reduction and oil circuit impact of the electro-hydraulic reversing valve caused by the problem, and improves the stability of die assembly action and the overall working efficiency.
In order to achieve the above purpose, the utility model discloses the following technical scheme:
an adjusting loop of an electro-hydraulic reversing valve for an injection molding machine opening and closing die with a shuttle valve comprises the electro-hydraulic reversing valve, the shuttle valve, a valve block, a hydraulic cylinder, an analog load, a differential valve and an oil tank; the electrohydraulic reversing valve, the shuttle valve, the hydraulic cylinder, the simulated load, the differential valve and the oil tank are fixedly connected with the valve block;
the hydraulic cylinder is provided with a cylinder body, a rod cavity and a rodless cavity are arranged in the cylinder body, the differential valve is provided with an A port, a P port and a T port, the rod cavity is communicated with the A port of the differential valve, and the rodless cavity is connected with the P port of the differential valve to form a differential loop; the differential valve T port is communicated with the electrohydraulic reversing valve B port; the electro-hydraulic reversing valve comprises a pilot valve and a main valve, wherein the pilot valve of the electro-hydraulic reversing valve is provided with a pilot control oil port X, and the main valve of the electro-hydraulic reversing valve is provided with a main oil inlet P, a main oil return port T, a working oil port A and a working oil port B; the rodless cavity of the hydraulic cylinder is communicated with a working oil port A of a main valve of the electro-hydraulic reversing valve, and a main oil inlet P of the main valve of the electro-hydraulic reversing valve is communicated with a main oil way of the hydraulic cylinder; the working oil port B of the main valve of the electro-hydraulic reversing valve is communicated with the port T of the differential valve, and the main oil return port T of the main valve of the electro-hydraulic reversing valve and the differential valve are communicated with an oil tank; the main oil inlet P of the main valve of the electro-hydraulic reversing valve is connected with a pump port;
the shuttle valve is provided with a P1 oil port, a P2 oil port and a P3 oil port, the P1 oil port of the shuttle valve is connected with a rodless cavity of the hydraulic cylinder, the P2 oil port of the shuttle valve is connected with a rod cavity of the hydraulic cylinder, and the P3 oil port of the shuttle valve is connected with a pilot control oil port X of the pilot valve of the electro-hydraulic reversing valve;
the valve block comprises a shell and an internal runner arranged in the shell, cover plates of the electro-hydraulic reversing valve, the differential valve and the shuttle valve are respectively fixed with the shell through connecting pieces, plugging devices are arranged at the joints of the side surface of the shell of the valve block and the internal runner, and the internal runner comprises an oil inlet runner, an oil return runner, runners respectively connected with an X port, a P port, an A port, a T port and a B port of the electro-hydraulic reversing valve, runners respectively connected with an oil port P1, an oil port P2 and an oil port P3 of the shuttle valve, runners respectively connected with the P port, the A port and the T port of the differential valve and runners respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder; the oil inlet flow passage is communicated with the P-port flow passage of the electro-hydraulic reversing valve, the oil return flow passage is communicated with the T-port flow passage of the electro-hydraulic reversing valve, the X-port flow passage of the electro-hydraulic reversing valve is communicated with the P3-port flow passage of the shuttle valve, the A-port flow passage of the electro-hydraulic reversing valve, the P1-port flow passage of the shuttle valve and the P-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rodless cavity of the hydraulic cylinder, the P2-port flow passage of the shuttle valve and the A-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rod cavity of the hydraulic cylinder, and the T-port flow passage of the differential valve is communicated with the B-port flow passage of the electro-hydraulic reversing valve;
the simulated load is connected with a piston rod of the hydraulic cylinder, and the hydraulic cylinder outputs force and displacement outwards so as to drive the load to move.
Preferably, the P1 oil port of the shuttle valve is connected with the rodless cavity of the hydraulic cylinder through a first pipeline, and the P2 oil port of the shuttle valve is connected with the rod cavity of the hydraulic cylinder through a second pipeline.
Preferably, the fuel tank is an open fuel tank.
Preferably, the first pipeline and the second pipeline are both high-pressure-resistant hoses.
Preferably, the oil inlet flow passage is communicated with the P-port flow passage of the electro-hydraulic reversing valve through 90-degree internal elbows, the oil return flow passage is communicated with the T-port flow passage of the electro-hydraulic reversing valve through two 90-degree internal elbows, the X-port flow passage of the electro-hydraulic reversing valve is communicated with the P3-port flow passage of the shuttle valve through 90-degree internal elbows, the A-port flow passage of the electro-hydraulic reversing valve, the P1-port flow passage of the shuttle valve and the P-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rodless cavity of the hydraulic cylinder through 90-degree internal elbows, the P2-port flow passage of the shuttle valve and the A-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rod cavity of the hydraulic cylinder through 90-degree internal elbows, and the T-port flow passage of the differential valve is communicated with the B-port flow passage of the electro-hydraulic reversing valve through 90-degree internal elbows.
Preferably, the cover plates of the electro-hydraulic reversing valve, the differential valve and the shuttle valve are fixedly connected with the shell through four bolts respectively.
Preferably, the plugging device is a hexagon-shaped plug screw, and three hexagon-shaped plug screws are arranged on the front surface of the valve block shell and below the valve block shell.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The hydraulic reversing valve is provided with the valve block, the electro-hydraulic reversing valve, the shuttle valve, the hydraulic cylinder, the simulated load, the differential valve and the oil tank are fixedly connected with the valve block, and a plurality of flow passages are arranged in the valve block and are connected with other parts.
(2) The structure of the utility model can also effectively reduce meaningless false closing and reopening actions of the electrohydraulic reversing valve, thereby reducing hydraulic impact in the using process and prolonging the service life of the hydraulic element.
(3) The utility model solves the problem of the mistaken closing of the electrohydraulic reversing valve, avoids time delay caused by the mistaken closing and reopening, can effectively shorten the action period of opening and closing the die and improves the working efficiency of the injection molding machine.
Drawings
FIG. 1 is a schematic diagram of the principle structure of the present utility model;
FIG. 2 is an isometric view of the overall structure of an electro-hydraulic reversing valve adjustment loop for an injection molding machine with a shuttle valve according to the present utility model;
FIG. 3 is an isometric view of a valve block of the present utility model;
FIG. 4 is a rear view of the valve block of the present utility model;
FIG. 5 is a left side view of the valve block of the present utility model;
FIG. 6 is a front view of a valve block of the present utility model;
FIG. 7 is a three-dimensional schematic of the overall structure of the present utility model;
FIG. 8 is a three-dimensional schematic of the rear view of the overall structure of the present utility model;
fig. 9 is a three-dimensional transparent physical schematic of the internal structure of the shuttle valve cover plate and the shuttle valve according to the present utility model.
Some of the figures are described below:
1-electrohydraulic reversing valve, 2-shuttle valve, 3-hydraulic cylinder, 4-analog load, 5-differential valve, 6-oil tank, 7 valve block, 61-oil inlet, 62-oil return port, 11-inner flow port communicated with X port of electrohydraulic reversing valve, 12-inner flow port communicated with A port of electrohydraulic reversing valve, 13-inner flow port communicated with T port of electrohydraulic reversing valve, 14-inner flow port communicated with P port of electrohydraulic reversing valve, 15-inner flow port communicated with B port of electrohydraulic reversing valve, 16-bolt hole for fixing the electrohydraulic reversing valve on valve block, 21-P1 oil port, 22-P2 oil port, 23-P3 oil port, 24-bolt hole for fixing shuttle valve cover plate on valve block, 3a 1-inner flow port communicated with rodless cavity, 3a 2-inner flow port communicated with rod cavity, 51-inner flow port communicated with A port of differential valve, 52-inner flow port communicated with P port of differential valve, 53-inner flow port communicated with T port of differential valve, 8-second port of differential valve, and pipeline, 8-second port of differential valve and pipeline, and valve port of solenoid valve on valve and 8-port of pipeline.
Detailed Description
Exemplary embodiments, features and aspects of the present utility model will be described in detail below with reference to the attached drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In the embodiment of the utility model, an injection molding machine open-close die electrohydraulic reversing valve adjusting circuit with a shuttle valve is provided, and as shown in fig. 1 and 7-9, the injection molding machine open-close die electrohydraulic reversing valve adjusting circuit comprises an electrohydraulic reversing valve 1, a shuttle valve 2, a hydraulic cylinder 3, an analog load 4, a differential valve 5, an oil tank 6 and a valve block 7. The electrohydraulic reversing valve 1, the hydraulic cylinder 3, the differential valve 5 and the oil tank are sequentially connected to form a basic mold opening and closing action loop. The P1 oil port 21 of the shuttle valve 2 is communicated with the rodless cavity of the hydraulic cylinder 3, the P2 oil port 22 of the shuttle valve 2 is communicated with the rod cavity of the hydraulic cylinder 3, namely the pressure of the P1 oil port 21 of the shuttle valve 2 is the same as the pressure of the rodless cavity, and the pressure of the P2 oil port 22 of the shuttle valve 2 is the same as the pressure of the rod cavity. The oil with higher pressure compared by the shuttle valve 2 is communicated with the pilot control oil port X of the pilot valve of the electro-hydraulic reversing valve 1 through the P3 oil port 23 of the shuttle valve 2 to form an adjusting loop for preventing the electro-hydraulic reversing valve 1 from being closed by mistake. The P1 oil port of the shuttle valve is connected with the rodless cavity of the hydraulic cylinder through a first pipeline 9, and the P2 oil port of the shuttle valve is connected with the rod cavity of the hydraulic cylinder through a second pipeline 10.
As shown in fig. 2, the hydraulic reversing valve comprises an electrohydraulic reversing valve 1, a shuttle valve 2, a valve block 7, a hydraulic cylinder 3, a simulated load 4, a differential valve 5 and an oil tank 6; the electrohydraulic reversing valve 1, the shuttle valve 2, the hydraulic cylinder 3, the simulated load 4, the differential valve 5 and the oil tank 6 are fixedly connected with the valve block 7.
The hydraulic cylinder 3 is provided with a cylinder body, a rod cavity and a rodless cavity are arranged in the cylinder body, the differential valve 5 is provided with an A port, a P port and a T port, the rod cavity is communicated with the A port of the differential valve 5, and the rodless cavity is connected with the P port of the differential valve 5 to form a differential loop; the T port of the differential valve 5 is connected to the main oil passage. The electro-hydraulic reversing valve 1 comprises a pilot valve and a main valve, the pilot valve of the electro-hydraulic reversing valve 1 is provided with a pilot control oil port X, and the main valve of the electro-hydraulic reversing valve 1 is provided with a main oil inlet P, a main oil return port T, a working oil port A and a working oil port B. The rodless cavity of the hydraulic cylinder 3 is communicated with a working oil port A of a main valve of the electro-hydraulic reversing valve 1, and a main oil inlet P of the main valve of the electro-hydraulic reversing valve 1 is communicated with a main oil way of the hydraulic cylinder 3. The working oil port B of the main valve of the electro-hydraulic reversing valve 1 is communicated with the T port of the differential valve 5, and the main oil return port T of the main valve of the electro-hydraulic reversing valve 1 and the differential valve 5 are communicated with an oil tank. The main oil inlet P of the main valve of the electrohydraulic reversing valve 1 is connected with a pump opening.
The shuttle valve 2 is provided with a P1 oil port 21, a P2 oil port 22 and a P3 oil port 23, the P1 oil port 21 of the shuttle valve 2 is connected with a rodless cavity of the hydraulic cylinder 3, the P2 oil port 22 of the shuttle valve 2 is connected with a rod cavity of the hydraulic cylinder 3, and the P3 oil port 23 of the shuttle valve 2 is connected with a pilot control oil port X of a pilot valve of the electro-hydraulic reversing valve 1.
As shown in fig. 2 to 6, the valve block 7 comprises a housing and an internal flow passage arranged in the housing, cover plates of the electro-hydraulic reversing valve 1, the differential valve 5 and the shuttle valve 2 are respectively fixed with the housing through connecting pieces, and plugging devices are arranged at the joints of the side surfaces of the housing of the valve block and the internal flow passage. The internal runner comprises an oil inlet runner, an oil return runner, runners respectively connected with an X port, a P port, an A port, a T port and a B port of the electrohydraulic reversing valve, runners respectively connected with a P1 port, a P2 port and a P3 port of the shuttle valve, runners respectively connected with a P port, an A port and a T port of the differential valve, and runners respectively leading to a rodless cavity and a rod cavity of the hydraulic cylinder. Three inner hexagonal plugs 8 are arranged on the front surface of the valve block shell and below the valve block shell.
The side wall of the valve block is respectively provided with an oil inlet 61, an oil return port 62, an inner flow passage 11 communicated with an X port of the electro-hydraulic reversing valve, an inner flow passage 12 communicated with an A port of the electro-hydraulic reversing valve, an inner flow passage 13 communicated with an T port of the electro-hydraulic reversing valve, an inner flow passage 14 communicated with an P port of the electro-hydraulic reversing valve, an inner flow passage 15 communicated with an B port of the electro-hydraulic reversing valve, an inner flow passage 3a1 communicated with a rodless cavity, an inner flow passage 3a2 communicated with a rod cavity, an inner flow passage 51 communicated with an A port of the differential valve, an inner flow passage 52 communicated with an P port of the differential valve and an inner flow passage 53 communicated with an T port of the differential valve.
The oil inlet flow passage is communicated with the P-port flow passage of the electrohydraulic reversing valve 1 through 90-degree internal elbows, the oil return flow passage is communicated with the T-port flow passage of the electrohydraulic reversing valve 1 through two 90-degree internal elbows, the X-port flow passage of the electrohydraulic reversing valve 1 is communicated with the P3-port flow passage of the shuttle valve 2 through 90-degree internal elbows, the A-port flow passage of the electrohydraulic reversing valve 1, the P1-port flow passage of the shuttle valve 2 and the P-port flow passage of the differential valve 5 are respectively communicated with the flow passage leading to the rodless cavity of the hydraulic cylinder 3 through 90-degree internal elbows, and the P2-port flow passage of the shuttle valve 2 and the A-port flow passage of the differential valve 5 are respectively communicated with the flow passage leading to the rod cavity of the hydraulic cylinder 3 through 90-degree internal elbows, and the T-port flow passage of the differential valve 5 is communicated with the B-port flow passage of the electrohydraulic reversing valve 1 through 90-degree internal elbows.
The simulated load is connected with a piston rod of the hydraulic cylinder 3 and is used for representing the outward output force and displacement of the hydraulic cylinder 3 so as to drive the load to move.
The cover plates of the electrohydraulic reversing valve, the differential valve and the shuttle valve are fixedly connected with the shell through four bolts respectively. The housing is provided with bolt holes 16 for securing the electro-hydraulic reversing valve to the valve block, bolt holes 24 for securing the shuttle valve cover plate to the valve block, and bolt holes 54 for securing the differential valve to the valve block.
In the embodiment of the utility model, the shuttle valve 2 belongs to a bidirectional control valve, oil ports at the left end and the right end of the shuttle valve 2 are respectively communicated with a rodless cavity and a rod cavity of a movable mould oil cylinder, and an oil port output of the shuttle valve is communicated with a pilot valve oil inlet of the electrohydraulic reversing valve 1 to form a core control part for preventing the electrohydraulic reversing valve 1 from being closed by mistake, namely the shuttle valve selects oil with larger pressure in the pressure of the two cavities to output to a pilot control oil port X port 101 of the electrohydraulic reversing valve 1.
The electro-hydraulic reversing valve 1 is a pilot control valve, the pilot valve stage is an electromagnetic reversing valve, the main valve stage is a hydraulic reversing valve, the control mode is internal control leakage, the pilot-stage oil inlet oil way, namely a pilot control oil port X port 101, is communicated with an internal main oil way, and oil is controlled to enter a main valve control cavity to control the switching of the opening and closing actions of the injection molding machine.
The differential valve 5 is a pilot control valve, pilot control oil of the differential valve is derived from a main oil way, and after the pilot electromagnet is electrified, a valve core of the differential valve acts under the control oil pressure, and oil return oil of a rod cavity is communicated with oil inlet oil of a rodless cavity through the differential valve, so that a differential function is realized.
The specific use method of the utility model is as follows:
in the process of closing the mould of the injection moulding machine, when the differential motion of the hydraulic cylinder is finished and the oil way is switched to a non-differential loop, the zero pressure is caused by suction of the oil way of the rodless cavity of the hydraulic cylinder due to the inertia effect, but the movement speed of the piston rod is very fast, the oil return flow is relatively large.
In the process of opening the mould of the injection moulding machine, when the hydraulic cylinder is about to reach the end position of opening the mould, the rotating speed of the motor is reduced, the flow rate of oil is reduced, and under the inertia effect, the rod cavity of the hydraulic cylinder is partially sucked, but at the moment, the pressure of the rodless cavity is not zero under the effect of the back pressure of oil return; under the action of the shuttle valve, the pilot control oil pressure of the electro-hydraulic reversing valve is rodless cavity pressure and is not zero pressure value of the rod cavity, so that the electro-hydraulic reversing valve cannot be closed.
In summary, the shuttle valve is added on the control oil path at the front end of the pilot valve of the electro-hydraulic reversing valve, and the injection molding machine mold opening and closing hydraulic valve block comprising the electro-hydraulic reversing valve, the differential valve and the shuttle valve is designed, so that the problem of mistaken closing of the electro-hydraulic reversing valve caused by suction of an oil inlet path is avoided, the stability and the reliability of the mold opening and closing action process of the injection molding machine are improved, and the method has important significance for prolonging the service life of hydraulic elements and improving the processing work efficiency of plastic products to a certain extent.
The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.
Claims (7)
1. An injection molding machine opens and shuts mould electrohydraulic switching valve adjustment circuit with shuttle valve, its characterized in that: the hydraulic control system comprises an electrohydraulic reversing valve, a shuttle valve, a valve block, a hydraulic cylinder, an analog load, a differential valve and an oil tank; the electrohydraulic reversing valve, the shuttle valve, the hydraulic cylinder, the simulated load, the differential valve and the oil tank are fixedly connected with the valve block;
the hydraulic cylinder is provided with a cylinder body, a rod cavity and a rodless cavity are arranged in the cylinder body, the differential valve is provided with an A port, a P port and a T port, the rod cavity is communicated with the A port of the differential valve, and the rodless cavity is connected with the P port of the differential valve to form a differential loop; the T port of the differential valve is communicated with the B port of the main valve of the electro-hydraulic reversing valve; the electro-hydraulic reversing valve comprises a pilot valve and a main valve, wherein the pilot valve of the electro-hydraulic reversing valve is provided with a pilot control oil port X, and the main valve of the electro-hydraulic reversing valve is provided with a main oil inlet P, a main oil return port T, a working oil port A and a working oil port B; the rodless cavity of the hydraulic cylinder is communicated with a working oil port A of a main valve of the electro-hydraulic reversing valve, and a main oil inlet P of the main valve of the electro-hydraulic reversing valve is communicated with a main oil way of the hydraulic cylinder; the working oil port B of the main valve of the electro-hydraulic reversing valve is communicated with the port T of the differential valve, and the main oil return port T of the main valve of the electro-hydraulic reversing valve and the differential valve are communicated with an oil tank; the main oil inlet P of the main valve of the electro-hydraulic reversing valve is connected with a pump port;
the shuttle valve is provided with a P1 oil port, a P2 oil port and a P3 oil port, the P1 oil port of the shuttle valve is connected with a rodless cavity of the hydraulic cylinder, the P2 oil port of the shuttle valve is connected with a rod cavity of the hydraulic cylinder, and the P3 oil port of the shuttle valve is connected with a pilot control oil port X of the pilot valve of the electro-hydraulic reversing valve;
the valve block comprises a shell and an internal runner arranged in the shell, cover plates of the electro-hydraulic reversing valve, the differential valve and the shuttle valve are respectively fixed with the shell through connecting pieces, plugging devices are arranged at the joints of the side surface of the shell of the valve block and the internal runner, and the internal runner comprises an oil inlet runner, an oil return runner, runners respectively connected with an X port, a P port, an A port, a T port and a B port of the electro-hydraulic reversing valve, runners respectively connected with an oil port P1, an oil port P2 and an oil port P3 of the shuttle valve, runners respectively connected with the P port, the A port and the T port of the differential valve and runners respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder; the oil inlet flow passage is communicated with the P-port flow passage of the electro-hydraulic reversing valve, the oil return flow passage is communicated with the T-port flow passage of the electro-hydraulic reversing valve, the X-port flow passage of the electro-hydraulic reversing valve is communicated with the P3-port flow passage of the shuttle valve, the A-port flow passage of the electro-hydraulic reversing valve, the P1-port flow passage of the shuttle valve and the P-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rodless cavity of the hydraulic cylinder, the P2-port flow passage of the shuttle valve and the A-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rod cavity of the hydraulic cylinder, and the T-port flow passage of the differential valve is communicated with the B-port flow passage of the electro-hydraulic reversing valve;
the simulated load is connected with a piston rod of the hydraulic cylinder, and the hydraulic cylinder outputs force and displacement outwards so as to drive the load to move.
2. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 1, wherein: the P1 oil port of the shuttle valve is connected with the rodless cavity of the hydraulic cylinder through a first pipeline, and the P2 oil port of the shuttle valve is connected with the rod cavity of the hydraulic cylinder through a second pipeline.
3. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 1, wherein: the oil tank is an open type oil tank.
4. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 2, wherein: the first pipeline and the second pipeline are both high-pressure-resistant hoses.
5. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 2, wherein: the oil inlet flow passage is communicated with the P-port flow passage of the electrohydraulic reversing valve through 90-degree internal elbows, the oil return flow passage is communicated with the T-port flow passage of the electrohydraulic reversing valve through two 90-degree internal elbows, the X-port flow passage of the electrohydraulic reversing valve is communicated with the P3-port flow passage of the shuttle valve through 90-degree internal elbows, the A-port flow passage of the electrohydraulic reversing valve, the P1-port flow passage of the shuttle valve and the P-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rodless cavity of the hydraulic cylinder through 90-degree internal elbows, the P2-port flow passage of the shuttle valve and the A-port flow passage of the differential valve are respectively communicated with the flow passage leading to the rod cavity of the hydraulic cylinder through 90-degree internal elbows, and the T-port flow passage of the differential valve is communicated with the B-port flow passage of the electrohydraulic reversing valve through 90-degree internal elbows.
6. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 2, wherein: and the cover plates of the electro-hydraulic reversing valve, the differential valve and the shuttle valve are fixedly connected with the shell through four bolts respectively.
7. The electro-hydraulic switching valve trim circuit of an injection molding machine with a shuttle valve of claim 2, wherein: the plugging device is an inner hexagonal plug screw, and three inner hexagonal plug screw are arranged on the front surface of the valve block shell and below the valve block shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320260321.XU CN219276566U (en) | 2023-02-20 | 2023-02-20 | Injection molding machine open-close die electrohydraulic reversing valve adjusting loop with shuttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320260321.XU CN219276566U (en) | 2023-02-20 | 2023-02-20 | Injection molding machine open-close die electrohydraulic reversing valve adjusting loop with shuttle valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219276566U true CN219276566U (en) | 2023-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320260321.XU Active CN219276566U (en) | 2023-02-20 | 2023-02-20 | Injection molding machine open-close die electrohydraulic reversing valve adjusting loop with shuttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219276566U (en) |
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2023
- 2023-02-20 CN CN202320260321.XU patent/CN219276566U/en active Active
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