CN218030861U - Pressure return pressure control oil circuit for injection molding machine mold core - Google Patents
Pressure return pressure control oil circuit for injection molding machine mold core Download PDFInfo
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- CN218030861U CN218030861U CN202221869976.9U CN202221869976U CN218030861U CN 218030861 U CN218030861 U CN 218030861U CN 202221869976 U CN202221869976 U CN 202221869976U CN 218030861 U CN218030861 U CN 218030861U
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Abstract
The utility model discloses a pressure return pressure control oil circuit for a mold core of an injection molding machine, which relates to the field of injection molding machines and utilizes a damping hole arranged on a pressure type cartridge valve to lead pressure oil in a rodless cavity to a two-position electromagnetic directional valve when the injection molding machine injects the oil and input the pressure oil into a proportional pressure valve through the two-position electromagnetic directional valve; the proportional pressure valve controls the communication state of the first oil port and the third oil port of the pressure type cartridge valve according to the pressure value of pressure oil input by the two-position electromagnetic directional valve, and when the pressure value reaches the set value of the proportional pressure valve, the first oil port and the third oil port of the pressure type cartridge valve are in the communication state, so that when the mold core pushes the ejector rod to move towards the rodless cavity in advance due to the increase of the pressure in the mold cavity, return oil in the rodless cavity flows to the oil tank through a communication channel of the first oil port and the third oil port of the pressure type cartridge valve, and the function of pressing back of the mold core connected with the ejector rod to move towards the rodless cavity in the injection process is achieved.
Description
Technical Field
The utility model relates to an injection molding machine field especially relates to a pressure return pressure control oil circuit for injection molding machine core.
Background
In the production process, the ejector rod is connected with a mold core in the mold cavity, the ejector rod needs to control the mold core in the mold to be pushed to the bottom before injection of the injection molding machine (namely, the ejector rod needs to be pushed to the bottom in the direction of the cavity with the rod), and aiming at some special molds and processes, the mold core needs to be pressed back passively along with the increase of the pressure in the mold cavity in the injection process (namely, the pressing back function that the mold core connected with the ejector rod moves in the direction of the cavity without the rod needs to be realized in the injection process), and due to the requirements of the process or products, the pressing back pressure needs to be regulated and controlled flexibly, and the control loop of the ejection device on the existing injection machine cannot realize the functions of pressing back and the function that the pressing back pressure can be regulated flexibly.
SUMMERY OF THE UTILITY MODEL
Aiming at some special dies and processes, in order to realize the function of pressing back of the core moving towards the direction of the rodless cavity and the function of flexibly adjusting the pressing back pressure, the utility model provides a pressing back pressure control oil circuit for the core of the injection molding machine, one end of the ejector rod is connected with the core in the die cavity; before injection of the injection molding machine, the ejector rod is in a jacking in-place state, and the control oil way comprises:
a first oil port of the three-position electromagnetic directional valve is connected with an oil outlet of the hydraulic pump, a fourth oil port is connected with a rod cavity of the ejector rod propulsion oil cylinder, a second oil port is connected with an oil tank, and a third oil port is connected with a rodless cavity of the ejector rod propulsion oil cylinder;
a first oil port of the pressure type cartridge valve is connected to a connecting line between a third oil port of the three-position electromagnetic directional valve and the rodless cavity, a second oil port of the pressure type cartridge valve is connected with one end of the two-position electromagnetic directional valve, and the third oil port is connected with an oil tank and is simultaneously connected to a first oil port of the proportional pressure valve; the other end of the two-position electromagnetic directional valve is connected with a second oil port of the proportional pressure valve;
the pressure type cartridge valve is provided with a damping hole for guiding pressure oil in the rodless cavity to the two-position electromagnetic directional valve during injection of the injection molding machine and inputting the pressure oil into the proportional pressure valve through the two-position electromagnetic directional valve; the proportional pressure valve controls the communication state of the first oil port and the third oil port of the pressure type cartridge valve according to the pressure value of pressure oil input by the two-position electromagnetic directional valve so as to realize the function of pressing back when the core connected with the ejector rod moves towards the direction of the rodless cavity and the control of the pressing back pressure when the core moves towards the direction of the rodless cavity in the injection process;
when the injection molding machine injects, the three-position electromagnetic directional valve is in a neutral position state, and the neutral position state is that only the second oil port to the fourth oil port are in a communication state.
Furthermore, an electromagnet and a one-way valve with the flow direction facing to a second oil port of the pressure type cartridge valve are arranged on the two-position electromagnetic directional valve, and when the electromagnet is not electrified, the second oil port of the pressure type cartridge valve is connected with the one-way valve on the two-position electromagnetic directional valve; when the electromagnet is electrified, the two-position electromagnetic directional valve is switched into a conducting state, so that the second oil port of the pressure type cartridge valve and the second oil port of the proportional pressure valve are in a communicating state.
Furthermore, a hydraulic control one-way valve with a forward flow direction facing the rod cavity is arranged on a connecting line between a fourth oil port of the three-position electromagnetic directional valve and the rod cavity, and a control point of the hydraulic control one-way valve is arranged on a connecting line between a third oil port of the three-position electromagnetic directional valve and the rodless cavity.
Furthermore, a first oil port of the pressure type cartridge valve is connected to a connecting line between a hydraulic control one-way valve control point and the rodless cavity.
Compared with the prior art, the utility model discloses contain following beneficial effect at least:
(1) The utility model utilizes the damping hole arranged on the pressure type cartridge valve to lead the pressure oil in the rodless cavity to the two-position electromagnetic directional valve when the injection molding machine injects, and the pressure oil is input into the proportional pressure valve through the two-position electromagnetic directional valve; the proportional pressure valve controls the communication state of the first oil port and the third oil port of the pressure type cartridge valve according to the pressure value of pressure oil input by the two-position electromagnetic directional valve, when the pressure value reaches the set value of the proportional pressure valve, the first oil port and the third oil port of the pressure type cartridge valve are in the communication state, so that when the mold core pushes the ejector rod to move towards the rodless cavity in advance due to the increase of the pressure in the mold cavity during injection, return oil in the rodless cavity flows to the oil tank through a communication channel of the first oil port and the third oil port of the pressure type cartridge valve, the function of pressing back of the mold core connected with the ejector rod to move towards the rodless cavity in the injection process is realized, meanwhile, the set value of the proportional pressure valve can be flexibly adjusted as required, and the flexible adjustment of the pressing back pressure is realized;
(2) When the injection molding machine injects, the second oil port to the fourth oil port of the three-position electromagnetic directional valve are in a communicated state so as to input oil in the oil tank into the rod cavity, and the rod cavity is prevented from generating vacuum when the mold core moves towards the direction of the rodless cavity;
(3) When the three-position electromagnetic reversing valve is in a middle position state, the rodless cavity is in a closed state, oil can not be fed into the rodless cavity, oil can not be discharged from the rodless cavity due to the fact that the hydraulic control one-way valve is arranged in the rod cavity, and the hydraulic control one-way valve is used for achieving the function of stopping the ejector rod in the middle position state;
(4) The utility model discloses based on pressure back pressure control oil circuit, realized that the ejector pin moves back, the ejector pin advances, the ejector pin stops when realized that the core is toward the nimble adjustment of the pressure back function and the pressure back pressure of no pole chamber direction motion, satisfied customer's demand for special mould and technology have obtained very big application and popularization on general injection molding machine.
Drawings
FIG. 1 is a schematic diagram of a pressure return pressure control circuit for an injection molding machine core.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example one
In order to realize the function of pressing back of the mold core moving towards the direction of the rodless cavity and the function of flexibly adjusting the pressing back pressure, as shown in fig. 1, the utility model provides a pressing back pressure control oil circuit for the mold core of the injection molding machine, one end of the ejector rod is connected with the mold core in the mold cavity (the end of the concrete ejector rod close to the rod cavity is connected with the mold core in the mold cavity); before injection of the injection molding machine, the ejector rod is in a jacking in-place state, and the pressure in the mold cavity is increased, so that the mold core pushes the ejector rod to move towards the direction of the rodless cavity in advance, and the control oil way comprises:
a first oil port P1 of the three-position electromagnetic directional valve V22 is connected with an oil outlet P of the hydraulic pump, a fourth oil port A is connected with a rod cavity of the ejector rod propulsion oil cylinder, a second oil port T1 is connected with an oil tank T, and a third oil port B is connected with a rodless cavity of the ejector rod propulsion oil cylinder;
the pressure type cartridge valve V10.1 is characterized in that a first oil port B of the pressure type cartridge valve V10.1 is connected to a connecting line between a third oil port B of the three-position electromagnetic directional valve and a rodless cavity, a second oil port C is connected with one end of the two-position electromagnetic directional valve V10.3, and the third oil port T1 is connected with an oil tank T and is simultaneously connected to a first oil port T1 of a proportional pressure valve V10.2; the other end of the two-position electromagnetic directional valve V10.3 is connected with a second oil port C1 of the proportional pressure valve V10.2;
the pressure type cartridge valve V10.1 is provided with a damping hole for guiding pressure oil in a rodless cavity to the two-position electromagnetic directional valve V10.3 when the injection molding machine injects, and the pressure oil is input into the proportional pressure valve V10.2 through the two-position electromagnetic directional valve V10.3; the proportional pressure valve V10.2 controls the communication state of the first oil port B and the third oil port T1 of the pressure type cartridge valve V10.1 according to the pressure value of pressure oil input by the two-position electromagnetic directional valve V10.3 so as to realize the function of pressing back when the core connected with the ejector rod moves towards the direction of the rodless cavity and the control of the pressing back pressure when the core moves towards the direction of the rodless cavity in the injection process;
when the injection molding machine injects, the three-position electromagnetic directional valve V22 is in a neutral state, and the neutral state is that only the second oil port T1 to the fourth oil port a are in a communication state (the first electromagnet D204 and the second electromagnet D205 of the three-position electromagnetic directional valve V22 are not energized).
During injection, the pressure in the mold cavity is increased, so that the core in the mold cavity pushes the ejector rod to move towards the rodless cavity in advance, the state is not ejection and retreat under normal conditions, and therefore, the three-position electromagnetic directional valve V22 is still in a neutral state under the state. In fig. 1, the position state of the jack is a state of being pushed back to the proper position.
The two-position electromagnetic directional valve V10.3 is provided with an electromagnet D100.1 and a check valve with a second oil port C facing the flow direction of the pressure type cartridge valve V10.1, and when the electromagnet D100.1 is not electrified, the second oil port C of the pressure type cartridge valve V10.1 is connected with the check valve on the two-position electromagnetic directional valve V10.3; when the electromagnet D100.1 is energized, the two-position electromagnetic directional valve V10.3 is switched into a conducting state (i.e., switched to the arrow position in fig. 1V10.3), so that the second port C of the pressure type cartridge valve V10.1 and the second port C1 of the proportional pressure valve V10.2 are in a communicating state.
A hydraulic control one-way valve V41 with a forward flow direction (i.e., the flow direction from A1 to A2) facing the rod cavity is arranged on a connecting line connecting the fourth oil port a of the three-position electromagnetic directional valve V22 and the rod cavity, and a control point B of the hydraulic control one-way valve V41 is arranged on a connecting line connecting the third oil port B of the three-position electromagnetic directional valve V22 and the rodless cavity.
And a first oil port B of the pressure type cartridge valve V10.1 is connected to a connecting line between a pilot-controlled check valve control point B and the rodless cavity.
The utility model utilizes the damping hole arranged on the pressure type cartridge valve V10.1 to lead the pressure oil in the rodless cavity to the two-position electromagnetic directional valve V10.3 when the injection machine injects, and the pressure oil is input into the proportional pressure valve V10.2 through the two-position electromagnetic directional valve V10.3; the proportional pressure valve V10.2 controls the communication state of the first oil port B and the third oil port T1 of the pressure type cartridge valve V10.1 according to the pressure value of pressure oil input by the two-position electromagnetic directional valve V10.3, when the pressure value reaches the set value of the proportional pressure valve V10.2, the first oil port B and the third oil port T1 of the pressure type cartridge valve V10.1 are in the communication state, so that when the mold core pushes the ejector rod to move towards the direction of the rodless cavity due to the increase of the pressure in the mold cavity during injection, return oil in the rodless cavity flows to the oil tank through a communication channel of the first oil port B and the third oil port T1 of the pressure type cartridge valve V10.1, the pressure return function that the mold core connected with the ejector rod moves towards the direction of the rodless cavity during injection is realized, and meanwhile, the set value of the proportional pressure valve V10.2 can be flexibly adjusted as required, and the flexible adjustment of the pressure return is realized.
Example two
The utility model also provides a pressure return pressure control method for injection molding machine core is applied to foretell pressure return pressure control oil circuit, include:
when the injection molding machine injects, the two-position electromagnetic directional valve V10.3 is controlled to be powered on, so that the two-position electromagnetic directional valve V10.3 is switched into a conducting state, at this time, the pressure oil in the rodless cavity is led to the two-position electromagnetic directional valve V10.3 through the damping hole on the pressure type cartridge valve V10.1 and flows into the proportional pressure valve V10.2 through the two-position electromagnetic directional valve V10.3, when the pressure value of the pressure oil flowing into the proportional pressure valve V10.2 reaches the set value of the proportional pressure valve V10.2, the second oil port C1 of the proportional pressure valve V10.2 is communicated with the first oil port T1, at this time, the pressure oil is released, so that the pressure type cartridge valve V10.1 is opened, namely the first oil port B of the pressure type cartridge valve V10.1 is communicated with the third oil port T1, and the pressure oil in the rodless cavity flows back to the oil tank.
When the injection molding machine injects, the second oil port T1 to the fourth oil port a of the three-position electromagnetic directional valve V22 are in a communication state (the three-position electromagnetic directional valve V22 is in a neutral state) so as to input the pressure oil in the oil tank T into the rod cavity.
During injection of the injection molding machine, the second oil port T1 of the three-position electromagnetic directional valve V22 to the fourth oil port A are in a communicated state, so that pressure oil in the oil tank T is input into a rod cavity, and when the core moves towards the direction of the rodless cavity, the rod cavity is vacuumized.
When the three-position electromagnetic directional valve V22 is in a neutral state, the rodless cavity is in a closed state and can not take oil and can not produce oil, the rod cavity can only take oil and can not produce oil due to the hydraulic control one-way valve V41, and the push rod stopping function is realized by the hydraulic control one-way valve V41 in the neutral state.
When the injection machine injects, the two-position electromagnetic directional valve V10.3 is controlled to be electrified to be switched into a conducting state, and pressure oil in the rodless cavity is led to the two-position electromagnetic directional valve V10.3 by utilizing the damping hole arranged on the pressure type cartridge valve V10.1 and is input into the proportional pressure valve V10.2 through the two-position electromagnetic directional valve V10.3; the proportional pressure valve V10.2 controls a communication state of the first port B and the third port T1 of the pressure type cartridge valve V10.1 according to a pressure value of pressure oil input by the two-position electromagnetic directional valve V10.3, specifically, when the pressure value reaches a set value of the proportional pressure valve V10.2, the second port C1 of the proportional pressure valve V10.2 is communicated with the first port T1, at this time, the first port B and the third port T1 of the pressure type cartridge valve V10.1 are in a communication state due to pressure oil relief, so that when the mold cavity pressure is increased to enable the mold core to push the ejector rod to move towards the rodless cavity in advance, return oil in the rodless cavity flows to the oil tank through a communication channel of the first port B and the third port T1 of the pressure type cartridge valve V10.1, thereby realizing a function of pressure return of the mold core connected with the ejector rod to move towards the rodless cavity in the injection process, and simultaneously, the set value of the proportional pressure valve V10.2 can be flexibly adjusted as required, thereby realizing flexible adjustment of pressure return oil.
EXAMPLE III
The utility model also provides a ejector pin advances control method for injection molding machine ejector pin is applied to foretell pressure back pressure control oil circuit, include:
the first electromagnet D204 for controlling the three-position electromagnetic directional valve V22 is powered on, at this time, the first oil port P1 to the third oil port B and the fourth oil port a to the second oil port T1 of the three-position electromagnetic directional valve V22 are in a conduction state, the pressure oil in the oil outlet P of the hydraulic pump flows to the rodless cavity through the communication channel of the first oil port P1 to the third oil port B, and when the pressure oil flows to the control point B of the hydraulic control one-way valve V41, the hydraulic control one-way valve V41 is reversely opened under the action of the pressure oil (to conduct the flow direction from A2 to A1), at this time, the return oil in the rod cavity flows to the oil tank T through the communication channel of the hydraulic control one-way valve V41 and the fourth oil port a of the three-position electromagnetic directional valve V22 to the second oil port T1 in sequence, so as to realize the push rod feeding function.
The utility model also provides a ejector pin moves back control method for injection molding machine ejector pin is applied to foretell pressure back pressure control oil circuit, include:
the second electromagnet D205 of the three-position electromagnetic directional valve V22 is controlled to be powered on, at this time, the third oil port B to the second oil port T1 and the first oil port P1 to the fourth oil port a of the three-position electromagnetic directional valve V22 are in a conducting state, and the pressure oil in the oil outlet P of the hydraulic pump sequentially flows to the rod cavity through the communication passage from the first oil port P1 to the fourth oil port a and the hydraulic control check valve V41; the return oil in the rodless cavity flows into the oil tank T through a communication channel from the third oil port B of the three-position electromagnetic directional valve V22 to the second oil port T1, so that the ejector rod retreating function is realized.
The utility model discloses based on pressure back pressure control oil circuit, realized that the ejector pin moves back, the ejector pin advances, the ejector pin stops when realized that the core is toward the nimble adjustment of the pressure back function and the pressure back pressure of no pole chamber direction motion, satisfied customer's demand for special mould and technology have obtained very big application and popularization on general injection molding machine.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, the descriptions in the present application as to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Claims (4)
1. A pressure return pressure control oil path for a mold core of an injection molding machine is characterized in that one end of an ejector rod is connected with the mold core in a mold cavity; before injection of the injection molding machine, the ejector rod is in a jacking in-place state, and the control oil way comprises:
a first oil port of the three-position electromagnetic directional valve is connected with an oil outlet of the hydraulic pump, a fourth oil port is connected with a rod cavity of the ejector rod propulsion oil cylinder, a second oil port is connected with an oil tank, and a third oil port is connected with a rodless cavity of the ejector rod propulsion oil cylinder;
a first oil port of the pressure type cartridge valve is connected to a connecting line between a third oil port of the three-position electromagnetic directional valve and the rodless cavity, a second oil port of the pressure type cartridge valve is connected with one end of the two-position electromagnetic directional valve, and the third oil port is connected with an oil tank and is simultaneously connected to a first oil port of the proportional pressure valve; the other end of the two-position electromagnetic directional valve is connected with a second oil port of the proportional pressure valve;
the pressure type cartridge valve is provided with a damping hole for guiding pressure oil in the rodless cavity to the two-position electromagnetic directional valve during injection of the injection molding machine and inputting the pressure oil into the proportional pressure valve through the two-position electromagnetic directional valve; the proportional pressure valve controls the communication state of the first oil port and the third oil port of the pressure type cartridge valve according to the pressure value of pressure oil input by the two-position electromagnetic directional valve so as to realize the function of pressing back when the core connected with the ejector rod moves towards the direction of the rodless cavity and the control of the pressing back pressure when the core moves towards the direction of the rodless cavity in the injection process;
when the injection molding machine injects, the three-position electromagnetic directional valve is in a middle position state, and the middle position state is that only the second oil port and the fourth oil port are in a communication state.
2. The pressure return pressure control oil circuit for the injection molding machine core as claimed in claim 1, wherein the two-position electromagnetic directional valve is provided with an electromagnet and a check valve with a flow direction facing a second oil port of the pressure type cartridge valve, and when the electromagnet is not powered, the second oil port of the pressure type cartridge valve is connected with the check valve on the two-position electromagnetic directional valve; when the electromagnet is electrified, the two-position electromagnetic directional valve is switched into a conducting state, so that the second oil port of the pressure type cartridge valve and the second oil port of the proportional pressure valve are in a communicating state.
3. The pressure-return pressure-control oil circuit for the mold core of the injection molding machine as claimed in claim 1, wherein a pilot-operated check valve having a forward flow direction facing the rod cavity is disposed on a connection line connecting the fourth oil port of the three-position electromagnetic directional valve and the rod cavity, and a control point of the pilot-operated check valve is disposed on a connection line connecting the third oil port of the three-position electromagnetic directional valve and the rodless cavity.
4. The pressure-return pressure-control oil circuit for the injection molding machine core as claimed in claim 3, wherein the first oil port of the pressure-type cartridge valve is connected to a connecting line between the pilot-controlled check valve control point and the rodless cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221869976.9U CN218030861U (en) | 2022-07-08 | 2022-07-08 | Pressure return pressure control oil circuit for injection molding machine mold core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221869976.9U CN218030861U (en) | 2022-07-08 | 2022-07-08 | Pressure return pressure control oil circuit for injection molding machine mold core |
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| Publication Number | Publication Date |
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| CN218030861U true CN218030861U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221869976.9U Active CN218030861U (en) | 2022-07-08 | 2022-07-08 | Pressure return pressure control oil circuit for injection molding machine mold core |
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| CN (1) | CN218030861U (en) |
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2022
- 2022-07-08 CN CN202221869976.9U patent/CN218030861U/en active Active
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