CN216732807U - Hydraulic circuit of injection molding machine mold closing unit - Google Patents
Hydraulic circuit of injection molding machine mold closing unit Download PDFInfo
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- CN216732807U CN216732807U CN202123209304.3U CN202123209304U CN216732807U CN 216732807 U CN216732807 U CN 216732807U CN 202123209304 U CN202123209304 U CN 202123209304U CN 216732807 U CN216732807 U CN 216732807U
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Abstract
The utility model provides a hydraulic circuit of a mold closing unit of an injection molding machine, which adopts a bypass valve, the oil inlet end of the bypass valve is connected to a rodless cavity of a quick oil cylinder, the oil outlet end of the bypass valve is connected to a hydraulic oil tank through an electromagnetic switch valve, therefore, about half of the return oil flow from the rodless cavity can be shunted through the bypass valve, so that when the mold closing unit of the injection molding machine acts, the hydraulic oil flow of the P end of the proportional directional valve communicated with the B end and the A end of the proportional directional valve communicated with the T end is basically consistent, therefore, the drift diameter of the proportional reversing valve can be selected according to half of the oil return amount of the rodless cavity, after the proportional reversing valve with smaller drift diameter is adopted, the effective control range of the electric signal is completely the same when the mold is opened and closed, the control precision of the opening size of each end of the proportional reversing valve is higher, namely the hydraulic flow can be more accurately controlled, and therefore the mold closing and opening actions of the mold closing unit of the injection molding machine can be more accurately controlled. In addition, the proportional reversing valve with the smaller drift diameter can save cost.
Description
Technical Field
The utility model belongs to the technical field of the injection molding machine, concretely relates to hydraulic circuit of injection molding machine compound die unit.
Background
Two-plate hydraulic injection molding machines generally use two small-diameter large-stroke cylinders to achieve the rapid mold opening and closing movement of a movable mold, and the two cylinders are generally called rapid cylinders in the industry. In order to increase the amount of injection-molded products per unit time, the fast cylinder is required to be operated at a faster speed.
The structure of the quick oil cylinder of the injection molding machine is a single-piston rod type double-acting hydraulic cylinder, and the quick oil cylinder is characterized in that the action areas of a die closing cavity (rod cavity) and a die opening cavity (rodless cavity) of the oil cylinder are generally 1: 2, namely:
when the mold is closed, oil is fed into the rod cavity, oil is returned from the rodless cavity, and the area ratio of the two cavities of the oil cylinder ensures that the flow of hydraulic oil discharged from the rodless cavity is 2 times of the flow of hydraulic oil entering the oil cylinder, so the drift diameter of the hydraulic proportional reversing valve is required to be selected according to the rodless cavity with larger throughput flow in the two cavities.
Therefore, in order to solve the above problems, there is a need for a hydraulic circuit of an injection molding machine having a corresponding optimized design, which is capable of achieving higher control accuracy.
SUMMERY OF THE UTILITY MODEL
For solving the above problem, a hydraulic circuit of injection molding machine compound die unit with high control accuracy is provided, the utility model adopts the following technical scheme:
the utility model provides a hydraulic circuit of injection molding machine compound die unit, including hydraulic tank, the hydraulic pump, the proportional directional control valve, the check valve, solenoid valve and quick hydro-cylinder, this quick hydro-cylinder has cylinder body and piston rod, this piston rod separates this cylinder body for there being pole chamber and no pole chamber, the oil feed end of hydraulic pump is connected to hydraulic tank, the end that produces oil of hydraulic pump is connected to the P mouth of proportional directional control valve, the A mouth of proportional directional control valve is connected to there being the pole chamber, no pole chamber is connected to the B mouth of proportional directional control valve and the oil feed end of check valve respectively, the T mouth of proportional directional control valve and the end that produces oil of check valve all are connected to hydraulic tank through the solenoid valve, a serial communication port, still include: the bypass valve is provided with an oil inlet end and an oil outlet end, wherein the oil inlet end of the bypass valve is connected to the rodless cavity, the oil outlet end of the bypass valve is connected to the hydraulic oil tank through the electromagnetic switch valve, and the drift diameter of the proportional reversing valve corresponds to half of the oil return amount of the rodless cavity.
The utility model provides a hydraulic circuit of injection molding machine compound die unit can also have such technical characteristic, and wherein, the bypass valve still has a control end for hydraulically controlled reversing valve.
The utility model provides a hydraulic circuit of injection molding machine compound die unit can also have such technical characteristic, still includes: the bypass electromagnetic switch valve is used for controlling the on-off of the bypass valve and is provided with an oil inlet end and an oil outlet end; and a bypass safety valve for limiting the pressure in the hydraulic circuit, having an oil inlet end and an oil outlet end, wherein the control end of the bypass safety valve is connected to the oil inlet end of the bypass safety valve, the oil outlet end of the bypass safety valve is connected to the oil inlet end of the bypass electromagnetic switch valve, and the oil outlet end of the bypass electromagnetic switch valve is connected to the oil inlet end of the hydraulic electromagnetic switch valve.
Utility model with the functions and effects
According to the utility model discloses a hydraulic circuit of injection molding machine compound die unit, owing to adopted the bypass valve, and the oil feed end of bypass valve is connected to the rodless chamber of quick hydro-cylinder, the oil outlet end of bypass valve is connected to hydraulic tank through the electromagnetic switch valve, therefore can shunt about half the return flow that comes from the rodless chamber through the bypass valve, when making injection molding machine compound die unit move, the P end of proportional reversing valve leads to the B end, the hydraulic oil flow that the A end leads to the T end is unanimous basically, consequently the latus rectum of proportional reversing valve just can be selected according to half of the return flow of rodless chamber, adopt the proportional reversing valve of littleer latus rectum, the effective control range of electrical signal is the same when die sinking and compound die, the control accuracy of the opening size of each end of proportional reversing valve is higher, also can control hydraulic flow more accurately, thereby the compound die and the die sinking action of more accurate control injection molding machine compound die unit, the problem of conventional hydraulic circuit has effectively been solved. In addition, the proportional reversing valve with the smaller drift diameter can save cost.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic circuit of a mold closing unit of an injection molding machine according to an embodiment of the present invention.
Reference numerals:
a hydraulic circuit 100 of a mold closing unit of an injection molding machine; a hydraulic oil tank 101; a hydraulic pump 102; an electrically proportional reversing valve 103; a hydraulic relief valve 104; a quick cylinder 105; a cylinder 1051; a rod lumen 1051 a; a rodless chamber 1051 b; a piston rod 1052; a bypass valve 106; a small bore orifice 107; a bypass safety valve 108; a bypass electromagnetic opening/closing valve 109; a hydraulic electromagnetic opening/closing valve 110; a check valve 111; a large orifice 112.
Detailed Description
In order to make the utility model realize that technical means, creation characteristics, achievement purpose and efficiency are easily understood and known, it is right to combine embodiment and attached drawing below the utility model discloses an injection molding machine compound die unit's hydraulic circuit does specifically to explain.
< example >
The embodiment provides a hydraulic circuit of a mold closing unit of an injection molding machine, which is used for closing and opening a mold by driving the mold closing unit through a quick oil cylinder, wherein the mold closing unit is provided with a Movable Mold Plate (MMP) and a Fixed Mold Plate (FMP).
Fig. 1 is a schematic structural diagram of a hydraulic circuit of a mold closing unit of an injection molding machine according to an embodiment of the present invention.
As shown in fig. 1, a hydraulic circuit 100 of an injection molding machine clamping unit includes a hydraulic oil tank 101, a hydraulic pump 102, an electric proportional directional valve 103, an injection molding machine relief valve 104, a quick cylinder 105, a bypass valve 106, a small orifice 107, a bypass relief valve 108, a bypass solenoid open-close valve 109, a hydraulic solenoid open-close valve 110, a check valve 111, and a large orifice 112.
The hydraulic oil tank 101 stores hydraulic oil for performing hydraulic pressure.
The hydraulic pump 102 is used for pumping hydraulic oil from the hydraulic oil tank 101 to flow the hydraulic oil to the quick oil cylinder 105, thereby performing a hydraulic drive actuator operation. The hydraulic pump 102 has an oil suction port S (i.e., an oil inlet end) and a high-pressure oil discharge port P (i.e., an oil outlet end).
The electric proportional directional valve 103 is used for proportionally controlling the pressure and the flow of the quick oil cylinder 105 according to an input electric signal. The electro-proportional directional valve 103 has a P terminal, a T terminal, an A terminal and a B terminal. In this embodiment, the electro-proportional directional valve 103 is connected to a control device such as an industrial personal computer, and the size of the opening of each end of the electro-proportional directional valve 103, that is, the flow rate of each end, is determined by the voltage value input by the program in the industrial personal computer.
The injection molding machine safety valve 104 is interlocked with a mechanism, an electrical safety induction switch, and a safety control loop, and the injection molding machine safety valve 104 can be communicated only when all control signals related to the injection molding machine safety are not triggered. The quick oil cylinder 105 is used for driving a mold clamping unit of the injection molding machine to act.
As shown in fig. 1, the quick cylinder 105 has a cylinder 1051 and a piston rod 1052, and the piston of the piston rod 1052 divides the cylinder 1051 into a rod chamber 1051a and a rodless chamber 1051 b. The end of the piston rod 1052 (i.e. the output of the ram 105) is connected to the clamping unit.
The bypass valve 106 is used to divert the return oil flow from the rodless chamber 1051b and has an oil inlet end, an oil outlet end, and an electrical control end. In this embodiment, the bypass valve 106 is a pilot operated directional control valve, and the on/off of the pilot operated directional control valve is determined by comparing values of a first pilot operated force x, a second pilot operated force y, and a spring force z acting on the bypass valve 106. The spring force z is a small spring force that ensures that the bypass valve 106 is in the open state in the initial state.
The small orifice 107 and the large orifice 112 are used to change the pressure of the hydraulic oil in the hydraulic circuit 100, and provide a control pressure to the bypass valve 106, thereby controlling the on/off of the bypass valve 106.
The bypass relief valve 108 serves to define the maximum operating pressure of this portion of the circuit at which the rodless chamber 1051b returns, avoiding an over-pressure condition.
The bypass electromagnetic opening/closing valve 109 controls the flow direction of the hydraulic oil in the pilot circuit of the bypass valve 106.
The combination of the hydraulic electromagnetic switch valve 110 and the check valve 111 forms a differential circuit, when the mold is opened, oil enters the rodless cavity 1051b of the quick oil cylinder 105, oil is discharged from the rod cavity 1051a, and the hydraulic electromagnetic switch valve 110 is closed, so that the hydraulic oil discharged from the rod cavity 1051a cannot return to the hydraulic oil tank 101, but only flows to the rodless cavity 1051b through the check valve 111, so that the flow of the rod cavity 1051a is quickly supplemented to the rodless cavity 1051b, and the mold opening speed is increased. Since the area ratio of the rod chamber 1051a to the rodless chamber 1051b is 1: 2, the differential circuit can double the mold opening speed.
In addition, the injection molding machine safety valve 104, the bypass safety valve 108, the bypass electromagnetic switch valve 109, the hydraulic electromagnetic switch valve 110, and the check valve 111 all have an oil inlet end, an oil outlet end (i.e., an oil return end), and a control end, and the control ends are connected to control devices such as an industrial personal computer, and operate under the control of a predetermined program in the industrial personal computer.
As shown in fig. 1, an oil inlet end of a hydraulic pump 102 is connected to a hydraulic oil tank 101, an oil outlet end of the hydraulic pump 102 is connected to a P end of an electric proportional directional control valve 103, an a end of the electric proportional directional control valve 103 is connected to an oil inlet end of an injection molding machine safety valve 104, an oil outlet end of the injection molding machine safety valve 104 is connected to a rod chamber 1051a of a quick cylinder 105, a rodless chamber 1051B is connected to both a B end of the electric proportional directional control valve 103 through a large orifice 112 and an oil inlet end of a check valve 111, a T end of the electric proportional directional control valve 103 and an oil outlet end of the check valve 111 are connected to an oil inlet end of a hydraulic solenoid switch valve 110, an oil outlet end of the hydraulic solenoid switch valve 110 is connected to the hydraulic oil tank 101, an oil inlet end of a bypass valve 106 is connected to the rodless chamber 1051B, an oil inlet end of the bypass valve 106 is connected to an oil inlet end of the hydraulic solenoid switch valve 110, a control end of the bypass valve 106 is connected to an oil inlet end of the bypass safety valve 108, the oil outlet end of the bypass safety valve 108 is connected to the oil inlet end of the bypass electromagnetic switch valve 109, the oil outlet end of the bypass electromagnetic switch valve 109 is also connected to the oil inlet end of the hydraulic electromagnetic switch valve 110, and the control end of the bypass valve 106 is also connected to the B end of the electro-proportional directional valve 103 through the small hole orifice 107.
When the mold closing unit is driven to close the mold, hydraulic oil is sucked from the hydraulic oil tank 101 through an oil suction port S of the hydraulic pump 102 and is injected into a P end of the electric proportional reversing valve 103 through a high-pressure oil outlet P of the hydraulic pump 102, at the moment, a proportional electromagnet at a b end of the electric proportional reversing valve 103 is electrified under the control of an industrial personal computer, so that an oil passage of the electric proportional reversing valve 103 is switched from a middle position to a right position, namely the P end is communicated with an A end, meanwhile, the electromagnet of the safety valve 104 of the injection molding machine is electrified and conducted, high-pressure hydraulic oil enters a rod cavity 1051a of the quick oil cylinder 105 through the safety valve 104 of the injection molding machine, the volume of the rod cavity 1051a is increased, the piston of the piston rod 1052 is pushed to move, the piston rod 1052 is retracted, and at the moment, a movable mold plate of the mold closing unit is close to a fixed mold plate.
Meanwhile, the hydraulic oil in the rodless cavity 1051B is compressed, about half of the oil return quantity passes through the end B of the electric proportional directional valve, the end B is communicated with the end T, the other half of the hydraulic oil passes through the bypass valve 106, the end A of the electric proportional directional valve is communicated with the end T, and then the hydraulic electromagnetic switch valve 110 is not electrified, so that the hydraulic oil in the rodless cavity 1051B returns to the hydraulic oil tank 101, and the die closing action is completed.
When the mold closing unit is driven to open the mold, hydraulic oil is sucked from the hydraulic oil tank 101 through an oil suction port S of the hydraulic pump 102 and is injected into a P end of the electric proportional reversing valve 103 through a high-pressure oil outlet P of the hydraulic pump 102, at the moment, under the control of an industrial personal computer, a proportional electromagnet at an end a of the electric proportional reversing valve 103 is electrified, so that the electric proportional reversing valve 103 is switched from a middle position to a left position, namely the P end of the electric proportional reversing valve 103 is communicated with an end B, and the end A is communicated with an end T, so that high-pressure hydraulic oil enters a rodless cavity 1051B of the quick oil cylinder 105, the volume of the hydraulic oil in the rodless cavity 1051B is increased to push a piston to move, a piston rod is pushed out, a movable mold plate is far away from a fixed mold plate, and the mold opening action is completed. At this time, the hydraulic oil in the rod chamber 1051a is compressed and discharged to the outside, and the electromagnet of the safety valve 104 of the injection molding machine is simultaneously electrified, so that the hydraulic oil in the rod chamber 1051a is communicated to the T-end from the a-end of the electric proportional directional valve 103.
Further, the mold opening is divided into slow mold opening and fast mold opening. When the mold is opened at a slow speed, under the control of the industrial personal computer, the hydraulic electromagnetic switch valve 110 is not electrified, and hydraulic oil in the rod cavity 1051a returns to the hydraulic oil tank 101, so that the mold closing unit completes the slow mold opening action.
When the mold is opened quickly, under the control of an industrial personal computer, the hydraulic electromagnetic switch valve 110 is electrified, hydraulic oil discharged from the rod cavity 1051a cannot return to the hydraulic oil tank 101, but can only be collected to the rodless cavity 1051b through the check valve 111, so that the mold opening speed is increased by adding the flow output by the hydraulic pump 102 and the flow collected from the rod cavity 1051a, and the quick mold opening action is completed.
As described above, the bypass valve 106 is opened (i.e., opened) only during the mold closing operation, and the first hydraulic control force x is pressurized to be close to the quick cylinder 105 and the second hydraulic control force y is pressurized to be close to the electro-proportional switching valve 103 in the hydraulic circuit 100.
During mold closing, the rod chamber 1051a is filled with oil, the rodless chamber 1051b is drained passively, the first hydraulic control force x close to the quick oil cylinder 105 is at the upstream of the second hydraulic control force y, so pressure is built rapidly under the back pressure of the large-hole throttling hole 112, and the second hydraulic control force y needs to be built slowly through double damping of the large-hole throttling hole 112 and the small-hole throttling hole 107. Therefore, in the acceleration section and the constant speed section in the mold closing process, the first hydraulic control force x is larger than the resultant force of the second hydraulic control force y and the spring force z, the bypass valve 106 is opened, and the rodless cavity 1051a returns oil quickly. When the pressure of the second hydraulic control force y is slowly built up and the resultant force of the second hydraulic control force y and the spring force z is larger than the first hydraulic control force x, the bypass valve 106 is disconnected, the oil return of the rodless cavity 1051a only can pass through the electric proportional reversing valve 103, the movable die plate is close to the fixed die plate at the moment, the quick oil cylinder 105 enters a deceleration section, and at the moment, the deceleration of the die closing action is realized through the good opening control of the electric proportional reversing valve 103.
When the mold is opened, oil enters the rodless cavity 1051a, the second hydraulic control force y close to the electro-proportional directional valve 103 is located at the upstream of the first hydraulic control force x, the second hydraulic control force y builds pressure under the action of back pressure of the large-hole throttling hole 112, the first hydraulic control force x needs to build pressure slowly through the large-hole throttling hole 112, and meanwhile, the bypass valve 106 is always in an off state under the action of the spring force z.
Furthermore, the bypass relief valve 108 of the pilot circuit of the bypass valve 106 defines the highest working pressure of this part of the circuit returning from the rodless chamber 1051 a; when the mold opening load is large and the mold is required to be increased, the bypass electromagnetic switch valve 109 is forcibly electrified under the control of the industrial personal computer to forcibly disconnect the bypass valve 106, so that the stability and the safety of the hydraulic circuit 100 are ensured.
Examples effects and effects
According to the hydraulic circuit 100 of the mold clamping unit of the injection molding machine provided by the embodiment, because the bypass valve 106 is adopted, the oil inlet end of the bypass valve 106 is connected to the rodless cavity 1051B of the quick oil cylinder 105, and the oil outlet end of the bypass valve 106 is connected to the hydraulic oil tank 101 through the hydraulic electromagnetic switch valve 110, about half of the return oil flow from the rodless cavity 1051B can be diverted through the bypass valve 106, so that when the mold clamping unit of the injection molding machine acts, the hydraulic oil flow of the end B communicated with the end P and the end a communicated with the end T of the electric proportional reversing valve 103 are basically consistent, therefore, the drift diameter of the electric proportional reversing valve 103 can be selected according to half of the return oil flow of the rodless cavity 1051B, after the proportional reversing valve with a smaller drift diameter is adopted, the effective control range of an electric signal is completely the same during mold opening and mold clamping, the control precision of the opening size of each end of the electric proportional reversing valve 103 is higher, that is, the hydraulic flow can be controlled more accurately, therefore, the mold closing and opening actions of the mold closing unit of the injection molding machine are controlled more accurately, and the problems in the conventional hydraulic circuit are effectively solved. In addition, the adoption of the electric proportional reversing valve with smaller drift diameter can save cost.
In addition, the hydraulic circuit 100 of the present embodiment further includes a bypass relief valve 108 and a bypass electromagnetic on-off valve 109, the bypass relief valve 108 defines the highest working pressure of the part of the circuit where the rodless chamber 1051b returns oil, and the bypass electromagnetic on-off valve 109 forcibly opens the bypass valve 106 when the mold opening load is large and the mold opening needs to be increased, thereby ensuring the stability and safety of the hydraulic circuit 100.
The above embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above embodiments.
Claims (3)
1. The utility model provides a hydraulic circuit of injection molding machine compound die unit, includes hydraulic tank, hydraulic pump, proportional reversing valve, check valve, hydraulic pressure solenoid switch valve and quick hydro-cylinder, and this quick hydro-cylinder has cylinder body and piston rod, and this piston rod separates this cylinder body for there being the pole chamber and no pole chamber, the inlet end of hydraulic pump is connected to hydraulic tank, the end that produces oil of hydraulic pump is connected to proportional reversing valve's P end, proportional reversing valve's A end is connected to there is the pole chamber, no pole chamber is connected to respectively proportional reversing valve's B end and the inlet end of check valve, proportional reversing valve's T end and the end that produces oil of check valve all is connected to hydraulic pressure solenoid switch valve's inlet end, hydraulic pressure solenoid switch valve's the end that produces oil is connected to hydraulic tank, its characterized in that still includes:
a bypass valve having an oil inlet end and an oil outlet end,
wherein the oil inlet end of the bypass valve is connected to the rodless cavity,
the oil outlet end of the bypass valve is connected to the hydraulic oil tank through the electromagnetic switch valve,
the drift diameter of the proportional reversing valve corresponds to half of the oil return amount of the rodless cavity.
2. The hydraulic circuit of a clamping unit of an injection molding machine as claimed in claim 1, characterized in that:
the bypass valve is a hydraulic control type reversing valve and is also provided with a control end.
3. The hydraulic circuit of an injection molding machine clamp unit of claim 2, further comprising:
the bypass electromagnetic switch valve is used for controlling the on-off of the bypass valve and is provided with an oil inlet end and an oil outlet end; and
a bypass safety valve for limiting the pressure in the hydraulic circuit, having an oil inlet end and an oil outlet end,
wherein the control end of the bypass valve is connected to the oil inlet end of the bypass safety valve,
the oil outlet end of the bypass safety valve is connected to the oil inlet end of the bypass electromagnetic switch valve,
the oil outlet end of the bypass electromagnetic switch valve is connected to the oil inlet end of the hydraulic electromagnetic switch valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123209304.3U CN216732807U (en) | 2021-12-20 | 2021-12-20 | Hydraulic circuit of injection molding machine mold closing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123209304.3U CN216732807U (en) | 2021-12-20 | 2021-12-20 | Hydraulic circuit of injection molding machine mold closing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216732807U true CN216732807U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123209304.3U Active CN216732807U (en) | 2021-12-20 | 2021-12-20 | Hydraulic circuit of injection molding machine mold closing unit |
Country Status (1)
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|---|---|
| CN (1) | CN216732807U (en) |
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2021
- 2021-12-20 CN CN202123209304.3U patent/CN216732807U/en active Active
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