CN211901117U - Hydraulic control system for injection molding machine - Google Patents
Hydraulic control system for injection molding machine Download PDFInfo
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- CN211901117U CN211901117U CN201922456236.7U CN201922456236U CN211901117U CN 211901117 U CN211901117 U CN 211901117U CN 201922456236 U CN201922456236 U CN 201922456236U CN 211901117 U CN211901117 U CN 211901117U
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Abstract
The utility model discloses a hydraulic control system for an injection molding machine, which comprises a servo motor, a fixed displacement pump, a one-way valve, a logic valve, an oil tank and an actuating element; an oil inlet of the constant delivery pump is communicated with the oil tank, and an oil outlet of the constant delivery pump is communicated with an inlet of the one-way valve through a first oil pipe; the outlet of the one-way valve, the execution element and the inlet of the logic valve are communicated in sequence; the outlet of the logic valve is communicated with the oil tank; the control port of the logic valve is communicated with the first oil pipe through a second oil pipe; the servo motor is in transmission connection with the fixed displacement pump and is used for driving the fixed displacement pump to pump oil in the oil tank and convey the oil to the first oil pipe and the second oil pipe; the second oil pipe is configured such that oil in the second oil pipe can flow back to the first oil pipe when the servo motor is turned off. The utility model discloses a servo motor, constant delivery pump, check valve, logic valve's cooperation realizes that the high pressure is to the conversion of low pressure, need not the servo motor reversal, can alleviate servo motor problem of generating heat to it is long when shortening the pressure release.
Description
Technical Field
The utility model relates to a model manufacturing shaping field especially relates to a hydraulic control system that injection molding machine was used.
Background
An injection molding machine is a common device used in injection molding production, and the working principle of the injection molding machine is to inject the plasticized plastic in a molten state into a closed mold cavity by means of the thrust of an actuating element (a screw or a plunger), and to obtain a product after solidification and shaping. At present, a hydraulic system is often adopted to provide power for an actuating element, the hydraulic system outputs pressure oil to the actuating element so as to drive the actuating element to act, and in one molding cycle of an injection molding machine, the molding cycle comprises the actions of mold opening and closing, glue melting, glue injection and pressure maintaining, mold supporting, seat platform advancing and retreating and the like, and the pressure and the flow of the pressure system required by each action are different, so that the pressure of the pressure oil provided by the hydraulic system is often required to be adjusted.
In the traditional injection molding machine taking a servo motor as a power source, the required flow and pressure are different in different stages of the injection molding process of the injection molding machine, and the difference of the flow is mainly determined by the rotating speed of the motor; the pressure difference is realized mainly by pressure switching of a hydraulic system, when high pressure is switched to low pressure, the switching mode is mainly realized by reversing the servo motor, the pressure of the system is reduced, the repeated forward and reverse rotation of the motor is switched, the servo motor is seriously heated and is easy to damage, and an executing element of the existing injection molding machine is connected with an oil tank through an overflow valve, so that the pressure relief time is long.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a hydraulic control system for injection molding machine, its cooperation through servo motor, constant delivery pump, check valve, logic valve realizes the conversion of high pressure to the low pressure, need not the servo motor reversal, can alleviate servo motor problem of generating heat to shorten the pressure release time.
The purpose of the utility model is realized by adopting the following technical scheme:
a hydraulic control system for an injection molding machine comprises a servo motor, a fixed displacement pump, a one-way valve, a logic valve, an oil tank and an execution element; an oil inlet of the fixed displacement pump is communicated with the oil tank, and an oil outlet of the fixed displacement pump is communicated with an inlet of the one-way valve through a first oil pipe; the outlet of the one-way valve, the execution element and the inlet of the logic valve are communicated in sequence; the outlet of the logic valve is communicated with the oil tank; the control port of the logic valve is communicated with the first oil pipe through a second oil pipe; the servo motor is in transmission connection with the fixed displacement pump and is used for driving the fixed displacement pump to pump oil in the oil tank and convey the oil to the first oil pipe and the second oil pipe; the second oil pipe is provided such that oil in the second oil pipe can flow back to the first oil pipe when the servo motor is turned off.
Further, a damping hole is arranged between the second oil pipe and the control port of the logic valve, and the second oil pipe and the control port of the logic valve are communicated with each other through the damping hole.
Furthermore, an oil inlet of the constant delivery pump is connected with an oil inlet pipe, and the oil inlet pipe extends into the oil tank.
Furthermore, an outlet of the logic valve is connected with an oil outlet pipe, and the oil outlet pipe extends into the oil tank.
Further, a pressure gauge is further arranged between the one-way valve and the dosing pump, and the pressure gauge is used for detecting oil pressure between the dosing pump and the one-way valve.
Further, the hydraulic control system for the injection molding machine further comprises a multi-way joint; an oil outlet of the fixed displacement pump is communicated with an inlet of the multi-way joint through a third oil pipe; the first oil pipe is communicated with a first outlet of the multi-way joint and an inlet of the one-way valve; the second oil pipe is communicated with a second outlet of the multi-way joint and a control port of the logic valve; the pressure gauge is communicated with the third outlet of the multi-way connector.
Further, the hydraulic control system for the injection molding machine further comprises a controller and a pressure sensor, wherein the pressure sensor is used for detecting the pressure value of the quantitative oil outlet and sending the pressure value to the controller; the controller is provided with a preset value and is used for closing or restarting the servo motor when the pressure value is equal to the preset value.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses an adopt the cooperation of servo motor, constant delivery pump and logic valve, when servo motor drove the constant delivery pump oil pumping and through first oil pipe to the check valve and through the control mouth of second oil pipe to the logic valve, at this moment, under the effect of the spring force and the oil pressure of logic valve, the logic valve closed, so, the constant delivery pump constantly passes through the check valve to the executive component oil delivery, realizes the high pressure; after the servo motor is closed, oil in the second oil pipe flows back to the first oil pipe, the oil pressure at the control port of the logic valve is gradually reduced, the logic valve can be opened by the oil entering the execution element, and the oil is discharged from the overflow valve, so that the pressure relief is realized; therefore, the high-voltage to low-voltage switching can be realized by turning off the servo motor, the reverse rotation of the servo motor is not needed, and the heating problem of the servo motor can be relieved; and moreover, the pressure flows to the oil tank through the logic valve, and the logic valve can achieve the performance of large flow, so that the pressure relief requirement can be completed in a short time.
Drawings
Fig. 1 is a schematic diagram of the structure of the hydraulic control system for the injection molding machine of the present invention.
In the figure: 10. a servo motor; 20. a constant delivery pump; 30. a one-way valve; 40. a logic valve; 41. a control port of the logic valve; 42. an inlet of a logic valve; 43. an outlet of the logic valve; 50. an oil tank; 60. a pressure gauge; 70. a first oil pipe; 80. a second oil pipe; 90. an actuator; 100. a third oil pipe; 110. an oil inlet pipe; 120. an oil outlet pipe; 130. a damping hole; 140. a controller; 150. a pressure sensor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
A hydraulic control system for an injection molding machine shown in fig. 1 includes a servo motor 10, a fixed displacement pump 20, a check valve 30, a logic valve 40, an oil tank 50, and an actuator 90; an oil inlet of the specific fixed displacement pump 20 is communicated with the oil tank 50. The oil outlet of the fixed displacement pump 20 is communicated with the inlet of the one-way valve 30 through a first oil pipe 70; the outlet of the check valve 30, the actuator 90 and the inlet 42 of the logic valve are in communication in sequence; the outlet 43 of the logic valve communicates with the tank 50; the control port 41 of the logic valve communicates with the first oil line 70 through the second oil line 80; the servo motor 10 is in transmission connection with the fixed displacement pump 20 and is used for driving the fixed displacement pump 20 to pump oil in the oil tank 50 and convey the oil to the first oil pipe 70 and the second oil pipe 80; the second oil pipe 80 is provided such that the oil in the second oil pipe 80 can flow back to the first oil pipe 70 when the servo motor 10 is turned off. Here, the logic valve 40 is a conventional component, and it is known in the art that the logic valve 40 is closed by its own spring force.
On the basis of the above structure, when the hydraulic control system for the injection molding machine is used, when the injection molding machine needs to provide high-pressure oil, the servo motor 10 is driven to drive the fixed displacement pump 20 to pump oil, the oil respectively enters the check valve 30 and the control port 41 of the logic valve through the first oil pipe 70 and the second oil pipe 80, the oil flowing to the check valve 30 enters the actuator 90, at this time, the oil pressure loss generated by the first pipeline, the second pipeline and the actuator 90 is generated, at this time, the oil pressure F1 of the inlet 42 of the logic valve is basically equal to the oil pressure F2 of the control port 41 of the logic valve, at this time, the pressure F applied to the control port 41 of the logic valve (i.e. in the spring cavity of the logic valve 40) is the sum of the oil pressure F2 and the spring force F3 of the logic valve 40, at this time, F > F1, so that the valve core of the logic valve 40 is pressed by the force F and is, that is, when the fixed displacement pump 20 continuously delivers oil in the direction of the check valve 30, the oil entering the actuator 90 can only be continuously accumulated at this point, and the pressure can be increased, that is, high-pressure oil is obtained; when the injection molding machine needs to provide low-pressure oil, namely, when the injection molding machine needs to be switched from high pressure to low pressure, the servo motor 10 is turned off, at this time, the oil in the second oil pipe 80 flows towards the first oil pipe 70 and flows back to the oil in the first oil pipe 70, because the oil pressure required by the reversal of the fixed displacement pump 20 is far greater than the opening oil pressure of the one-way valve 30, at this time, the oil in the first oil pipe 70 flows to the execution element 90 through the one-way valve 30 and flows to the inlet 42 of the logic valve, at this time, the oil pressure of the control port 41 of the logic valve is reduced, when the oil pressure of the inlet 42 of the logic valve is greater than the sum of the oil pressure of the control port 41 of the logic valve and the spring force of the; therefore, the high-voltage to low-voltage conversion is realized, the reverse rotation of the servo motor 10 is not needed, and the heating problem of the servo motor 10 is relieved.
Specifically, when the servo motor 10 is turned off, the oil pressure of one end of the second oil pipe 80 close to the logic valve 40 is greater than that of the other end of the second oil pipe 80, and at this time, under high-low pressure difference, the oil of the component can flow back to the first oil pipe 70; in the embodiment, one end of the second oil pipe 80 close to the control port 41 of the logic valve can be arranged above the other end of the second oil pipe 80, and at this time, when the servo motor 10 is closed, the oil can flow back to the first oil pipe 70 under the action of the gravity of the oil.
In order to avoid hydraulic shock of oil when entering or exiting the control port 41 of the logic valve, it is preferable that a damping hole 130 is provided between the second oil pipe 80 and the control port 41 of the logic valve and communicates with each other through the damping hole 130, so that the flow rate of oil entering or exiting the logic valve 40 is controlled through the damping hole 130 to thereby slow down the shock; in practical use, a damper is arranged between the second oil pipe 80 and the control port 41 of the logic valve, and the damping hole 130 is opened on the damper.
Specifically, an oil inlet of the fixed displacement pump 20 is connected to an oil inlet pipe 110, and the oil inlet pipe 110 extends into the oil tank 50, it can be understood that one end of the oil inlet pipe 110 is connected to the oil inlet of the fixed displacement pump 20, and the other end extends into the oil tank 50; an oil inlet of the fixed displacement pump 20 is communicated with the oil tank 50 through an oil inlet pipe 110. And/or, the outlet 43 of the logic valve is connected with a delivery line 120, and the delivery line 120 extends into the oil tank 50.
Preferably, a pressure gauge 60 is further disposed between the check valve 30 and the fixed displacement pump 20, and the pressure gauge 60 is used for detecting the oil pressure between the fixed displacement pump 20 and the check valve 30; thus, the oil pressure state can be intuitively known by reading the value of the pressure gauge 60.
More preferably, the hydraulic control system for an injection molding machine further comprises a multi-way joint; the oil outlet of the fixed displacement pump 20 is communicated with the inlet of the multi-way joint through a third oil pipe 100; the first oil pipe 70 communicates the first outlet of the multi-way joint and the inlet of the check valve 30; the second oil pipe 80 is communicated with a second outlet of the multi-way joint and a control port 41 of the logic valve; the pressure gauge 60 is communicated with a third outlet of the multi-way connector; thus, the oil outlet of the constant delivery pump 20 is respectively connected with a plurality of components through the multi-way joint, so that the installation is simplified, and the integral structure is simpler; it is understood here that the manifold has at least one inlet and at least three outlets, and in practical use, the manifold can be a four-way joint, a five-way joint, etc., and the unused outlets or inlets of the manifold can be blocked by the structure of the plugs.
In order to avoid damage to the hydraulic control system for the injection molding machine due to too high oil pressure, preferably, the hydraulic control system for the injection molding machine further comprises a controller 140 and a pressure sensor 150, wherein the pressure sensor 150 is used for detecting a pressure value of the quantitative oil outlet and sending the pressure value to the controller 140; the controller 140 is provided with a preset value, wherein the preset value is the highest oil pressure value which can be borne by the hydraulic control system for the injection molding machine; the controller 140 is used to shut down or restart the servo motor 10 when the pressure value is equal to a preset value, so that overpressure is avoided.
Specifically, the controller 140 may further set a preset program according to the injection molding product, for example, the preset program includes that when the received pressure value does not reach the required oil pressure value a, the controller 140 controls the servo motor 10 to drive the fixed displacement pump 20 to pump oil, and when the received pressure value reaches or exceeds the oil pressure value a, the controller 140 controls the servo motor 10 to be turned off or restarted, and the specific preset program is based on the actual requirement; at this time, the controller 140 may further connect to an alarm, and the controller 140 controls the alarm to give an alarm when the oil pressure value a is reached or exceeded.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (7)
1. A hydraulic control system for an injection molding machine, characterized in that: the device comprises a servo motor, a fixed displacement pump, a one-way valve, a logic valve, an oil tank and an execution element; an oil inlet of the fixed displacement pump is communicated with the oil tank, and an oil outlet of the fixed displacement pump is communicated with an inlet of the one-way valve through a first oil pipe; the outlet of the one-way valve, the execution element and the inlet of the logic valve are communicated in sequence; the outlet of the logic valve is communicated with the oil tank; the control port of the logic valve is communicated with the first oil pipe through a second oil pipe; the servo motor is in transmission connection with the fixed displacement pump and is used for driving the fixed displacement pump to pump oil in the oil tank and convey the oil to the first oil pipe and the second oil pipe; the second oil pipe is provided such that oil in the second oil pipe can flow back to the first oil pipe when the servo motor is turned off.
2. A hydraulic control system for an injection molding machine as claimed in claim 1, wherein: and a damping hole is arranged between the second oil pipe and the control port of the logic valve and is communicated with each other through the damping hole.
3. A hydraulic control system for an injection molding machine as claimed in claim 1, wherein: an oil inlet of the constant delivery pump is connected with an oil inlet pipe, and the oil inlet pipe extends into the oil tank.
4. A hydraulic control system for an injection molding machine as claimed in claim 1, wherein: and an outlet of the logic valve is connected with an oil outlet pipe, and the oil outlet pipe extends into the oil tank.
5. A hydraulic control system for an injection molding machine as claimed in claim 1, wherein: and a pressure gauge is further arranged between the one-way valve and the dosing pump and used for detecting the oil pressure between the dosing pump and the one-way valve.
6. The hydraulic control system for an injection molding machine according to claim 5, wherein: the hydraulic control system for the injection molding machine further comprises a multi-way joint; an oil outlet of the fixed displacement pump is communicated with an inlet of the multi-way joint through a third oil pipe; the first oil pipe is communicated with a first outlet of the multi-way joint and an inlet of the one-way valve; the second oil pipe is communicated with a second outlet of the multi-way joint and a control port of the logic valve; the pressure gauge is communicated with the third outlet of the multi-way connector.
7. The hydraulic control system for an injection molding machine according to claim 5, wherein: the hydraulic control system for the injection molding machine further comprises a controller and a pressure sensor, wherein the pressure sensor is used for detecting the pressure value of the quantitative oil outlet and sending the pressure value to the controller; the controller is provided with a preset value and is used for closing or restarting the servo motor when the pressure value is equal to the preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922456236.7U CN211901117U (en) | 2019-12-30 | 2019-12-30 | Hydraulic control system for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922456236.7U CN211901117U (en) | 2019-12-30 | 2019-12-30 | Hydraulic control system for injection molding machine |
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| Publication Number | Publication Date |
|---|---|
| CN211901117U true CN211901117U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922456236.7U Active CN211901117U (en) | 2019-12-30 | 2019-12-30 | Hydraulic control system for injection molding machine |
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| CN (1) | CN211901117U (en) |
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- 2019-12-30 CN CN201922456236.7U patent/CN211901117U/en active Active
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