CN218439976U - Closed hydraulic control system with multiple execution units for injection molding machine - Google Patents
Closed hydraulic control system with multiple execution units for injection molding machine Download PDFInfo
- Publication number
- CN218439976U CN218439976U CN202221878297.8U CN202221878297U CN218439976U CN 218439976 U CN218439976 U CN 218439976U CN 202221878297 U CN202221878297 U CN 202221878297U CN 218439976 U CN218439976 U CN 218439976U
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- way
- port
- working
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a closed hydraulic control system with multiple execution units for an injection molding machine, which is characterized by comprising an oil tank, a control unit, an energy unit, a first execution unit and a second execution unit; the energy unit comprises a bidirectional closed pump, and the control unit comprises a three-position six-way reversing valve; the oil outlet end of the two-way closed pump is connected with the oil inlet of the three-position six-way reversing valve through a first working oil way, and the oil inlet end of the two-way closed pump is connected with the oil return port of the three-position six-way reversing valve through a second working oil way; the first working oil port of the three-position six-way reversing valve is connected with the first oil port of the first execution unit, the second working oil port of the three-position six-way reversing valve is connected with the second oil port of the first execution unit, the third working oil port of the three-position six-way reversing valve is connected with the first oil port of the second execution unit, and the fourth working oil port of the three-position six-way reversing valve is connected with the second oil port of the second execution unit. The hydraulic system has the advantages of simple structure and more stable and reliable whole hydraulic system.
Description
Technical Field
The utility model relates to a hydraulic control system especially relates to a closed hydraulic control system for injection molding machine with many execution units.
Background
The hydraulic control system of an injection molding machine is an important component of the injection molding machine, and is applied to control injection, sol dissolving, mold opening and ejection and the like of the injection molding machine. The patent number is 202121936219.4's chinese utility model discloses a hydraulic control system for injection molding machine, including oil tank, energy resource unit and execution unit, the energy resource unit includes servo driver, servo motor and two-way closed pump, the oil tank is for two-way closed pump fuel feeding, servo motor is driven by servo driver, two-way closed pump is driven by servo motor, the oil feed end of two-way closed pump links to each other through first working oil circuit with execution unit's oil return end, the oil feed end of two-way closed pump links to each other through second working oil circuit with execution unit's oil feed end. Above-mentioned hydraulic control system for injection molding machine has saved the control adjusting device among the conventional hydraulic system, has solved the pump valve and has opened the problem that asynchronous results in the execution unit starting to strike, has avoided traditional hydraulic system to realize hydraulic shock and energy loss that switching-over and speed governing brought through control adjusting device effectively, compares with the hydraulic control system on traditional injection molding machine, has accurate, high-efficient and energy-conserving advantage.
If the closed hydraulic system is applied to an injection molding machine with a plurality of execution units, a plurality of corresponding valves are required to be arranged for control, namely, one working device is correspondingly provided with one valve for control, each increase of one working device means that one valve is additionally arranged, the failure rate is increased due to the increase of control elements, the reliability of the hydraulic system is reduced, and meanwhile, the increase of the control elements brings great difficulty to the overall design of the injection molding machine with limited installation position or space.
Disclosure of Invention
An object of the utility model is to provide a closed hydraulic control system for injection molding machine with many execution units to prior art's defect and not enough.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
a closed hydraulic control system with multiple working devices for an injection molding machine comprises an oil tank, a control unit, an energy unit, a first execution unit and a second execution unit; the energy unit comprises a first servo driver, a first servo motor and a bidirectional closed pump, the oil tank supplies oil to the bidirectional closed pump, the first servo motor is driven by the first servo driver, and the bidirectional closed pump is driven by the first servo motor; the control unit comprises a three-position six-way reversing valve; the oil outlet end of the bidirectional closed pump is connected with the oil inlet of the three-position six-way reversing valve through a first working oil path, and the oil inlet end of the bidirectional closed pump is connected with the oil return port of the three-position six-way reversing valve through a second working oil path; the first working oil port of the three-position six-way reversing valve is connected with the first oil port of the first execution unit, the second working oil port of the three-position six-way reversing valve is connected with the second oil port of the first execution unit, the third working oil port of the three-position six-way reversing valve is connected with the first oil port of the second execution unit, and the fourth working oil port of the three-position six-way reversing valve is connected with the second oil port of the second execution unit.
The three-position six-way reversing valve comprises a valve body and a valve rod, a valve cavity for installing the valve rod is formed in the valve body, six valve body oil ports are formed in the valve body and are respectively an oil inlet of the three-position six-way reversing valve, an oil return port of the three-position six-way reversing valve, a first working oil port of the three-position six-way reversing valve, a second working oil port of the three-position six-way reversing valve, a third working oil port of the three-position six-way reversing valve and a fourth working oil port of the three-position six-way reversing valve, each valve body oil port is communicated with the valve cavity through an independent valve body flow passage arranged inside the valve body, the valve rod is provided with four valve rod oil ports matched with the valve body oil ports in position, the four valve rods are communicated with one another in pairs to form two independent valve rod flow passages, and the valve rods are rotatably arranged in the valve cavity. The three-position six-way reversing valve with the structure is simple in structure, can be suitable for being used in a hydraulic system with multiple working devices, realizes that one valve controls two different working devices to work and reverse, can effectively simplify the hydraulic system with the multiple working devices, and ensures the reliability of the hydraulic system.
The valve body comprises a valve shell with a through cavity which is communicated from left to right, a first valve cover and a second valve cover are respectively arranged at the left end and the right end of the valve shell in a sealing mode, the left end and the right end of the through cavity are respectively covered by the first valve cover and the second valve cover, so that a closed valve cavity is formed among the first valve cover, the valve shell and the second valve cover, and six valve body oil ports are formed in the valve shell;
first valve gap have first installation department, first installation department tight fit stretch into install the valve case left end, second valve gap second installation department has, first installation department tight fit stretch into install the valve case right-hand member head, the outer wall of first installation department with the inner wall that link up the chamber the outer wall of second installation department with the inner wall that link up the chamber between be provided with the sealing member respectively. Simple structure, the installation of the valve rod in the valve body of being convenient for, and ensure stable sealed.
First installation department has the installation cavity of rotating, the second installation department the second installation cavity of rotating has, the valve rod about both ends respectively coaxial be provided with first rotation installation section and second rotation installation section, first rotation installation section rotationally install first rotation installation cavity in, the second rotate the installation section rotationally install the second rotate the installation cavity in. A stable installation space is provided for the rotary installation of the valve rod through the first rotary installation cavity and the second rotary installation cavity.
The first rotating installation section is connected with the first rotating installation cavity in a rotating mode, and the second rotating installation section is connected with the second rotating installation cavity in a rotating mode through bearings. Simple structure, it is with low costs, realize stable rotation and connect.
The second valve bonnet be provided with the second rotate the coaxial and induction cavity that is linked together of installation cavity, the second valve bonnet on be provided with three inductive switch, three inductive switch correspond the three operating position of tribit six-way switching-over valve respectively, three inductive switch's inductive probe stretch into the setting and be in the induction cavity in, the second rotate the installation section and extend right and be provided with coaxial response section, the response section set up the induction cavity in, the response section on be provided with one with the induction switch cooperation induction screw that uses. Through the cooperation of response screw and three inductive switch, realize the accurate switching of three operating position of tribit six-way switching-over valve, simple structure, control accuracy is high.
And a sealing element is arranged between the outer wall of the second rotary mounting section and the inner wall of the induction chamber. A stable sealing is achieved to avoid the risk of oil leakage.
The valve rod is provided with a rotary driving mechanism for driving the valve rod to rotate; the rotary driving mechanism comprises a second servo motor, the second servo motor is connected with a speed reducer, a mounting cavity matched with an output shaft of the speed reducer is coaxially arranged on the second rotary mounting section, and the output shaft of the speed reducer extends into the induction cavity and is tightly mounted in the mounting cavity. The valve rod is driven to rotate by the rotation driving mechanism so as to complete the switching among a plurality of working positions, and the switching efficiency is improved; the rotation driving mechanism is simple in structure, the rotation driving force is mainly provided by the second servo motor, and the speed reducer is used for reducing the rotating speed of the second servo motor, so that the situation that the valve rod is not easy to control as a whole due to the fact that the rotating speed is too high is prevented; the rotating reversing response of the valve rod driven by the second servo motor is fast, the position control precision is high, and the requirement of a high-response hydraulic system can be met.
The second servo motor is controlled by a second servo driver, the second servo driver is controlled by a controller, and the inductive switch is in electric signal connection with the controller. Realize holistic automation and accurate control.
And the first working oil path and the second working oil path are respectively provided with a pressure sensor, and the pressure sensors are in electric signal connection with the first servo driver. The two pressure sensors are used for respectively collecting oil pressure of the first working oil way and oil pressure of the second working oil way, the collected oil pressure is fed back to the first servo driver, the first servo motor feeds back current rotating speed information to the first servo driver through the encoder, the first servo driver feeds back received information to the controller on the injection molding machine, the received information is compared with a value set in the controller, the output value of the first servo driver for the first servo motor is correspondingly adjusted, dynamic control of the rotating speed of the first servo motor is achieved, and accurate closed-loop control of pressure and flow is achieved.
The oil supplementing unit comprises an oil supplementing valve group and an oil supplementing power group, the oil supplementing power group comprises an oil supplementing pump and a three-phase asynchronous motor for driving the oil supplementing pump, and the oil supplementing valve group comprises a first overflow valve, a second overflow valve, a third overflow valve, a fourth overflow valve, a flushing valve, a first check valve and a second check valve;
two oil inlet ends of the flushing valve are respectively connected with the first working oil way and the second working oil way, an oil outlet end of the flushing valve is connected with an oil inlet end of the first overflow valve, and an oil return end of the first overflow valve is connected with the oil tank;
the oil inlet end of the second overflow valve is connected with the first working oil way, and the oil return end of the second overflow valve is connected with the second working oil way; the oil inlet end of the third overflow valve is connected with the second working oil way, and the oil return end of the third overflow valve is connected with the first working oil way; the oil outlet end of the first check valve is connected with the first working oil way, the oil outlet end of the second check valve is connected with the second working oil way, a common oil way formed by connecting the oil inlet ends of the first check valve and the second check valve is connected with the oil outlet end of the oil supplementing pump, and the oil inlet end of the oil supplementing pump is connected with the oil tank;
the oil tank is characterized in that a common oil path formed by connecting the oil inlet ends of the first one-way valve and the second one-way valve is connected with the oil tank through the fourth overflow valve, the common oil path formed by connecting the oil inlet ends of the first one-way valve and the second one-way valve is connected with the oil inlet end of the fourth overflow valve, and the oil return end of the fourth overflow valve is connected with the oil tank. Through above-mentioned structure can effectively solve the fluid leakage that whole hydraulic system takes place in the course of the work and the fluid problem that generates heat, ensure the stable operation of whole hydraulic system.
The oil supply system is characterized in that an oil absorption filter is arranged between the oil inlet end of the oil supply pump and the oil tank, a first port of the oil absorption filter is connected with the oil tank, and a second port of the oil absorption filter is connected with the oil inlet end of the oil supply pump. An oil absorption filter is arranged at the position, and residual pollutants in the oil tank can be filtered out through the oil absorption filter, so that the oil supplementing pump is protected.
The oil outlet end of the oil replenishing pump is provided with a high-pressure filter, a first port of the high-pressure filter is connected with the oil outlet end of the oil replenishing pump, and a common oil path formed by connecting the oil inlet end of the fourth overflow valve, the oil inlet end of the first one-way valve and the oil inlet end of the second one-way valve is respectively connected with a second port of the high-pressure filter. The high-pressure filter is arranged at the position, so that pollutants can be prevented from entering the whole hydraulic system through the high-pressure filter, the pollution concentration of the hydraulic system is effectively controlled, and important elements such as the bidirectional closed pump and the like are protected.
The oil return ends of the first overflow valve and the fourth overflow valve are connected with the oil tank through a cooler, the oil return ends of the first overflow valve and the fourth overflow valve are respectively connected with a first port of the cooler, and a second port of the cooler is connected with the oil tank. The cooler is used for cooling hot oil flushed back from the first working oil circuit or the second working oil circuit, the hot oil is cooled by the cooler to become cold oil, the cold oil enters the oil tank, and the cold oil is recycled, so that the heating condition of the whole system in operation is effectively controlled, and the stable and efficient operation of the whole system is ensured.
And an oil drainage port of the bidirectional closed pump is connected with the oil tank. The leaked hot oil can be cooled in the oil tank and recycled.
The flushing valve is a three-position three-way valve. Simple structure and convenient control.
The first execution unit is a bidirectional rotating hydraulic motor, and the second execution unit is an equal-area double-rod hydraulic oil cylinder. The first execution unit selects a two-way rotating hydraulic motor, the second execution unit selects an equal-area double-rod hydraulic oil cylinder, oil inlet and oil outlet flow are the same, and circulating work of a closed system is achieved.
Compared with the prior art, the utility model has the advantages of: the three-position six-way reversing valve is used for controlling the two execution units to work respectively, the structure is simple, the number of control elements is saved, the failure rate is reduced, the whole hydraulic system is more stable and reliable, and the hydraulic system is suitable for being used by an injection molding machine with a limited installation position or space aiming at the hydraulic system.
Drawings
FIG. 1 is a hydraulic schematic diagram of the present invention;
FIG. 2 is a schematic view of the overall structure of the three-position six-way directional valve of the present invention;
fig. 3 is a schematic sectional structural view of the valve housing according to the present invention;
FIG. 4 is a first cross-sectional structural view of the valve stem of the present invention;
FIG. 5 is a second cross-sectional structural view of the valve stem of the present invention;
FIG. 6 is a third cross-sectional structural view of the valve stem of the present invention;
FIG. 7 is a schematic view of a partial cross-sectional structure of a three-position six-way reversing valve according to the present invention;
fig. 8 is the schematic cross-sectional structure diagram of the first valve cover, the second valve cover and the valve housing of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in the figure, the closed hydraulic control system for the injection molding machine with the multiple working devices comprises an oil tank 1, a control unit, an energy unit, a first execution unit 20 and a second execution unit 5; the energy unit comprises a first servo driver 2, a first servo motor 3 and a bidirectional closed pump 4, an oil tank 1 supplies oil to the bidirectional closed pump 4, the first servo motor 3 is driven by the first servo driver 2, and the bidirectional closed pump 4 is driven by the first servo motor 3; the control unit comprises a three-position six-way reversing valve G; the oil outlet end of the two-way closed pump 4 is connected with an oil inlet P port of the three-position six-way reversing valve G through a first working oil path E, and the oil inlet end of the two-way closed pump 4 is connected with an oil return port T port of the three-position six-way reversing valve G through a second working oil path F; a first working oil port A of the three-position six-way reversing valve G is connected with a first oil port of the first execution unit 20, a second working oil port B of the three-position six-way reversing valve G is connected with a second oil port of the first execution unit 20, a third working oil port C of the three-position six-way reversing valve G is connected with a first oil port of the second execution unit 5, and a fourth working oil port D of the three-position six-way reversing valve G is connected with a second oil port of the second execution unit 5.
In this embodiment, the three-position six-way reversing valve G includes a valve body and a valve rod G1, a valve cavity Q1 for mounting the valve rod G1 is provided in the valve body, the valve body has six valve body oil ports, which are respectively an oil inlet port P of the three-position six-way reversing valve G, an oil return port T of the three-position six-way reversing valve G, a first working oil port a of the three-position six-way reversing valve G, a second working oil port B of the three-position six-way reversing valve G, a third working oil port C of the three-position six-way reversing valve G, and a fourth working oil port D of the three-position six-way reversing valve G, each valve body oil port is communicated with the valve cavity Q1 through an independent valve body flow passage provided inside the valve body, wherein the oil inlet/return chambers (here, P-inlet/return) are respectively formed between the valve body flow passages that correspond to the valve cavity Q1, the four oil ports G11 respectively correspond to four oil passages (G12, G13, G14, G15G 12, and the valve rod G1 are rotatably communicated with the valve cavity Q1, and the two oil passages are formed in the valve cavity Q1. When the valve rod G1 is in the first working position, the six oil ports of the PTABCD are not communicated with each other and are all sealed; when the valve rod G1 is in the second working position, the P is communicated with the C, the T is communicated with the D, and the A and the B are sealed; when the valve rod G1 is in the third working position, the P-way A, the T-way B, the C and the D are sealed. The three-position six-way reversing valve G with the structure is simple in structure, can be suitable for being used in a hydraulic system with multiple working devices, realizes that one valve controls two different working devices to work and reverse, can effectively simplify the hydraulic system with the multiple working devices, and ensures the reliability of the hydraulic system.
In this embodiment, the valve body includes a valve housing G2 having a through cavity G201 penetrating left and right, a first valve cover G3 and a second valve cover G4 are respectively mounted on left and right ends of the valve housing G2 in a sealing manner, the first valve cover G3 and the second valve cover G4 seal the left and right ends of the through cavity G201, so that a sealed valve cavity Q1 is formed among the first valve cover G3, the valve housing G2 and the second valve cover G4, and six valve body oil ports are disposed on the valve housing G2. The structure is simple, and the valve rod G1 is convenient to install in the valve body.
In this embodiment, the first valve cover G3 has a first mounting portion G31, the first mounting portion G31 is inserted into the left end of the valve housing G2, the second valve cover G4 has a second mounting portion G41, the first mounting portion G31 is inserted into the right end of the valve housing G2, and sealing members G5 are respectively disposed between the outer wall of the first mounting portion G31 and the inner wall of the through cavity G201, between the outer wall of the second mounting portion G41 and the inner wall of the through cavity G201. Simple structure, easily assembly and sealed stable.
In this embodiment, the first mounting portion G31 has a first rotation mounting cavity G311, the second mounting portion G41 has a second rotation mounting cavity G411, the left and right ends of the valve rod G1 are respectively and coaxially provided with a first rotation mounting section G101 and a second rotation mounting section G102, the first rotation mounting section G101 is rotatably mounted in the first rotation mounting cavity G311, and the second rotation mounting section G102 is rotatably mounted in the second rotation mounting cavity G411. A stable installation space is provided for the rotational installation of the valve stem G1 through the first and second rotational installation chambers G311 and G411.
In this embodiment, the first rotation mounting section G101 and the first rotation mounting cavity G311, and the second rotation mounting section G102 and the second rotation mounting cavity G411 are rotatably connected by bearings G6, respectively. Simple structure, it is with low costs, realize stable rotation and connect.
In this specific embodiment, the second valve cover G4 is provided with an induction chamber G42 coaxial with and communicated with the second rotating installation chamber G411, the second valve cover G4 is provided with three induction switches (G71, G72, G73), the three induction switches (G71, G72, G73) respectively correspond to three working positions of the three-position six-way reversing valve, induction probes of the three induction switches (G71, G72, G73) extend into the induction chamber G42, the second rotating installation section G102 extends rightward to be provided with a coaxial induction section G103, the induction section G103 is arranged in the induction chamber G42, and the induction section G103 is provided with an induction screw G8 matched with the induction switches (G71, G72, G73). Through the cooperation of the induction screw G8 and the three induction switches (G71, G72 and G73), the accurate switching of three working positions of the three-position six-way reversing valve is realized, the structure is simple, and the control accuracy is high.
In this embodiment, a seal G5 is provided between the outer wall of the second rotary mounting section G102 and the inner wall of the sensing chamber G42. A stable sealing is achieved to avoid the risk of oil leakage.
In this embodiment, the valve rod G1 is provided with a rotation driving mechanism for driving the valve rod G1 to rotate. The valve rod G1 is driven to rotate through the rotation driving mechanism so as to complete switching among a plurality of working positions, and switching efficiency is improved.
In this embodiment, the rotation driving mechanism includes a second servo motor G9, the second servo motor G9 is connected to a speed reducer G10, a mounting cavity G1021 matched with an output shaft G1001 of the speed reducer G10 is coaxially arranged on the second rotation mounting section G102, and the output shaft G1001 of the speed reducer G10 extends into the induction cavity G42 and is tightly fitted and mounted in the mounting cavity G1021. The rotary driving mechanism is simple in structure, rotary driving force is mainly provided by the second servo motor G9, and the speed reducer G10 is used for reducing the rotating speed of the second servo motor G9 and preventing the valve rod G1 from being difficult to control integrally due to the fact that the rotating speed is too high; the response of driving the valve rod G1 to rotate and reverse through the second servo motor G9 is fast, the position control precision is high, and the requirement of a high-response hydraulic system can be met.
In this embodiment, the second servo motor G9 is controlled by a second servo driver G91, the second servo driver G91 is controlled by a controller (not shown), and the inductive switches G71, G72, G73 are electrically connected to the controller. Realize holistic automation and accurate control.
In this embodiment, the seal G5 is a seal ring. Low cost and stable sealing.
In this embodiment, a pressure sensor 6 is disposed on each of the first working oil path E and the second working oil path F, and the pressure sensor 6 is electrically connected to the first servo driver 2. The two pressure sensors 6 are used for respectively collecting oil pressure of the first working oil way E and oil pressure of the second working oil way F, the collected oil pressure is fed back to the first servo driver 2, the first servo motor 3 feeds back current rotating speed information to the first servo driver 2 through the encoder, the first servo driver 2 feeds back received information to a controller on the injection molding machine, the received information is compared with a value set in the controller, the output value of the first servo driver 2 for the first servo motor 3 is correspondingly adjusted, dynamic control of the rotating speed of the first servo motor 3 is realized, and pressure and accurate closed-loop control of flow are realized.
In this specific embodiment, the system further comprises an oil supplementing unit, wherein the oil supplementing unit comprises an oil supplementing valve group and an oil supplementing power group, the oil supplementing power group comprises an oil supplementing pump 7 and a three-phase asynchronous motor 8 for driving the oil supplementing pump 7, and the oil supplementing valve group comprises a first overflow valve 9, a second overflow valve 10, a third overflow valve 11, a fourth overflow valve 15, a flushing valve 12, a first check valve 13 and a second check valve 14;
two oil inlet ends of the flushing valve 12 are respectively connected with the first working oil path E and the second working oil path F, an oil outlet end of the flushing valve 12 is connected with an oil inlet end of a first overflow valve 9, and an oil return end of the first overflow valve 9 is connected with the oil tank 1;
the oil inlet end of the second overflow valve 10 is connected with the first working oil path E, and the oil return end of the second overflow valve 10 is connected with the second working oil path F; the oil inlet end of the third overflow valve 11 is connected with the second working oil way F, and the oil return end of the third overflow valve 11 is connected with the first working oil way E; the oil outlet end of the first check valve 13 is connected with a first working oil path E, the oil outlet end of the second check valve 14 is connected with a second working oil path F, a common oil path formed by connecting the oil inlet ends of the first check valve 13 and the second check valve 14 is connected with the oil outlet end of the oil supplementing pump 7, and the oil inlet end of the oil supplementing pump 7 is connected with the oil tank 1;
the common oil path formed by connecting the oil inlet ends of the first one-way valve 13 and the second one-way valve 14 is connected with the oil tank 1 through the fourth overflow valve 15, the common oil path formed by connecting the oil inlet ends of the first one-way valve 13 and the second one-way valve 14 is connected with the oil inlet end of the fourth overflow valve 15, and the oil return end of the fourth overflow valve 15 is connected with the oil tank 1. Through the structure, the problems of oil leakage and oil heating of the whole hydraulic system in the working process can be effectively solved, and the stable operation of the whole hydraulic system is ensured.
In this embodiment, an oil suction filter 16 is disposed between the oil inlet end of the oil replenishing pump 7 and the oil tank 1, a first port of the oil suction filter 16 is connected to the oil tank 1, and a second port of the oil suction filter 16 is connected to the oil inlet end of the oil replenishing pump 7. An oil suction filter 16 is provided at this position, and the oil suction filter 16 can filter out the pollutants remaining in the oil tank 1 to protect the oil replenishment pump 7.
In this embodiment, the oil outlet end of the oil replenishing pump 7 is provided with a high pressure filter 17, a first port of the high pressure filter 17 is connected to the oil outlet end of the oil replenishing pump 7, and a common oil path formed by connecting the oil inlet end of the fourth relief valve 15 and the oil inlet ends of the first check valve 13 and the second check valve 14 is connected to a second port of the high pressure filter 17, respectively. The high-pressure filter 17 is arranged at the position, pollutants can be prevented from entering the whole hydraulic system through the high-pressure filter 17, the pollution concentration of the hydraulic system is effectively controlled, and important elements such as the bidirectional closed pump 4 and the like are protected.
In this embodiment, the oil return ends of the first overflow valve 9 and the fourth overflow valve 15 are connected to the oil tank 1 through a cooler 18, the oil return ends of the first overflow valve 9 and the fourth overflow valve 15 are respectively connected to a first port of the cooler 18, and a second port of the cooler 18 is connected to the oil tank 1. The cooler 18 is used for cooling hot oil flushed back from the first working oil circuit E or the second working oil circuit F, and the hot oil is cooled by the cooler 18 to become cold oil and enters the oil tank 1 to be recycled, so that the heating condition of the whole system in operation is effectively controlled, and the stable and efficient operation of the whole system is ensured.
In this embodiment, the drain port of the two-way closed pump 4 is connected to the oil tank 1. The leaked hot oil can be cooled in the oil tank 1 and recycled.
In this embodiment, the flush valve 12 is a three-position, three-way valve. Simple structure and convenient control.
In this embodiment, the first actuator 20 is a two-way rotary hydraulic motor, and the second actuator 5 is an equal-area double-rod hydraulic cylinder. Two-way rotary hydraulic motor is selected for use to first execution unit 20, and equal-area two-out-rod hydraulic cylinder is selected for use to second execution unit 5, realizes that the oil feed is the same with the flow that produces oil, realizes the cycle work of closed system.
The first servo motor 3 drives the bidirectional closed pump 4 to respectively work in a forward direction and a reverse direction, and oil pressure and flow are controlled; the bidirectional closed pump 4 can rotate in the forward direction and the reverse direction and can work normally; the two pressure sensors 6 are used for collecting oil pressure of the two working oil paths and feeding the oil pressure back to the first servo driver 2; the first check valve 13 and the second check valve 14 are communicated with oil in a one-way mode, so that the oil is prevented from being flushed back to the oil supplementing pump 7 when oil is supplemented; the second overflow valve 10 and the third overflow valve 11 are used for preventing the pressure of the first working oil path E and the second working oil path F from being overloaded and limiting the highest pressure during working, the first overflow valve 9 mainly plays a role in maintaining the pressure of the oil supplementing pump, and the fourth overflow valve 15 plays a role in limiting the pressure of the oil supplementing pump 7; when the first working oil path E and the second working oil path F have pressure difference, the flushing valve 12 is opened by high pressure, the oil of the oil supplementing pump 7 is supplemented into the working oil path with lower oil pressure, and then the oil returns to the tank 1 through the flushing valve 12 and the first overflow valve 9, because the oil supplementing pump 7 is supplemented with the filtered cold oil and the flushed hot oil, the oil in the working oil path can be filtered and cooled in the circulating process; the oil supplementing pump 7 is a fixed displacement pump and is driven by a three-phase asynchronous motor 8; the cooler 18 is hot oil that cools the first working oil path E and the second working oil path F back; the oil tank 1 is used for supplying cold oil to the oil supplementing pump 7 and the bidirectional closed pump 4 and collecting hot oil returned from a working oil circuit.
The specific working principle is as follows: when the bidirectional rotary bidirectional hydraulic motor 20 and the equal-area double-outlet-rod hydraulic oil cylinder 5 do not work, the three-position six-way reversing valve G is located at the middle position, the PTABCD oil ports are sealed and are not communicated with each other, and the bidirectional rotary hydraulic motor 20 and the equal-area double-outlet-rod hydraulic oil cylinder 5 are kept in the fixed positions.
When the bidirectional rotary hydraulic motor 20 needs to work in a forward rotation mode, the three-position six-way reversing valve G is switched to a left working position, at the moment, the port P is communicated with the port A, the port B is communicated with the port T, the port C and the port D are sealed, the first servo motor 3 drives the bidirectional closed pump 4 to rotate in the forward rotation mode, the first working oil path E is an oil inlet oil path, the second working oil path F is an oil outlet oil path, oil in the second working oil path F enters the bidirectional rotary hydraulic motor 20 through the port T and the port B of the three-position six-way reversing valve G, oil returning of the bidirectional rotary hydraulic motor 20 enters the first working oil path E through the port A and the port P of the three-position six-way reversing valve G, and the bidirectional rotary hydraulic motor 20 works in the forward rotation mode. When the bidirectional rotary hydraulic motor 20 needs to work reversely, the three-position six-way reversing valve G is kept unchanged, and only the first servo motor 3 needs to drive the bidirectional closed pump 4 to rotate reversely, the first working oil path E is an oil outlet path, the second working oil path F is an oil inlet path, oil in the first working oil path E enters the bidirectional rotary hydraulic motor 20 through the port P and the port a of the three-position six-way reversing valve G, oil returned by the bidirectional rotary hydraulic motor 20 enters the second working oil path F through the port B and the port T of the three-position six-way reversing valve G, and the bidirectional rotary hydraulic motor 20 works reversely. The two pressure sensors 6 feed back current pressure information to the first servo driver 2, the first servo motor 3 feeds back current rotating speed information to the first servo driver 2 through the encoder, the first servo driver 2 feeds back received information to a controller on the injection molding machine, the received information is compared with a value given by the controller, an output value of the first servo driver 2 to the first servo motor 3 is correspondingly adjusted, the first servo motor 3 is dynamically controlled, and accurate closed-loop control of pressure flow in the working process of the bidirectional rotating hydraulic motor 20 is achieved.
When the piston rod of the equal-area double-outlet-rod hydraulic oil cylinder 5 needs to move forwards to work, the three-position six-way reversing valve G is switched to the right working position, the port P is communicated with the port C, the port D is communicated with the port T, the port A and the port B are sealed, the first servo motor 3 drives the two-way closed pump 4 to rotate forwards, the first working oil path E is an oil inlet path, the second working oil path F is an oil outlet path, oil of the second working oil path F enters the equal-area double-outlet-rod hydraulic oil cylinder 5 through the port T and the port D of the three-position six-way reversing valve G, oil returning of the equal-area double-outlet-rod hydraulic oil cylinder 5 enters the first working oil path E through the port C and the port P of the three-position six-way reversing valve G, and the piston rod of the equal-area double-outlet-rod hydraulic oil cylinder 5 moves forwards to work. When the piston rod of the equal-area double-outlet-rod hydraulic oil cylinder 5 needs to move backwards to work, the three-position six-way reversing valve G is kept unchanged, only the first servo motor 3 needs to reversely drive the two-way closed pump 4 to reversely rotate, the first working oil way E is an oil outlet way, the second working oil way F is an oil inlet way, oil in the first working oil way E enters the equal-area double-outlet-rod hydraulic oil cylinder 5 through a P port and a C port of the three-position six-way reversing valve G, oil returned by the equal-area double-outlet-rod hydraulic oil cylinder 5 enters the second working oil way F through a D port and a T port of the three-position six-way reversing valve G, and the piston rod of the equal-area double-outlet-rod hydraulic oil cylinder 5 moves backwards to work. The two pressure sensors 6 feed back current pressure information to the first servo driver 2, the first servo motor 3 feeds back current rotating speed information to the first servo driver 2 through the encoder, the first servo driver 2 feeds back received information to a controller on the injection molding machine, the received information is compared with a value given in the controller, the output value of the first servo driver 2 to the first servo motor 3 is correspondingly adjusted, the first servo motor 3 is dynamically controlled, and accurate closed-loop control of pressure flow in the working process of the equal-area double-rod hydraulic oil cylinder 5 is achieved.
After the energy unit and the oil supplementing unit are started, the bidirectional closed pump 4 drives the bidirectional rotary hydraulic motor 20 or the equal-area double-outlet-rod hydraulic oil cylinder 5 to work, a first working oil path E and a second working oil path F generate pressure difference, the flushing valve 12 is opened by the oil pressure on the high-pressure side of the working oil path, oil of the oil supplementing pump 7 is filtered by the high-pressure filter 17 and then is supplemented into the low-pressure working oil path through the check valve connected with the low-pressure working oil path, and redundant oil flows back to the oil tank 1 through the flushing valve 12, the first overflow valve 9 and the cooler 18. The surplus oil supplied through the oil replenishment unit is returned to the oil tank 1 through the fourth spill valve 15 and the cooler 18. When the first working oil path E or the second working oil path F has overpressure, the oil pressure at the overpressure side opens the second overflow valve 10 or the third overflow valve 11, and the overflowed oil flows into the low-pressure side, so that the system is prevented from being overloaded.
Claims (10)
1. A closed hydraulic control system with multiple execution units for an injection molding machine is characterized by comprising an oil tank, a control unit, an energy unit, a first execution unit and a second execution unit; the energy unit comprises a first servo driver, a first servo motor and a bidirectional closed pump, the oil tank supplies oil to the bidirectional closed pump, the first servo motor is driven by the first servo driver, and the bidirectional closed pump is driven by the first servo motor; the control unit comprises a three-position six-way reversing valve; the oil outlet end of the two-way closed pump is connected with the oil inlet of the three-position six-way reversing valve through a first working oil path, and the oil inlet end of the two-way closed pump is connected with the oil return port of the three-position six-way reversing valve through a second working oil path; the first working oil port of the three-position six-way reversing valve is connected with the first oil port of the first execution unit, the second working oil port of the three-position six-way reversing valve is connected with the second oil port of the first execution unit, the third working oil port of the three-position six-way reversing valve is connected with the first oil port of the second execution unit, and the fourth working oil port of the three-position six-way reversing valve is connected with the second oil port of the second execution unit.
2. The closed hydraulic control system of claim 1, wherein the three-position six-way directional control valve comprises a valve body and a valve rod, the valve body is internally provided with a valve cavity for mounting the valve rod, the valve body is provided with six valve body oil ports, the six valve body oil ports are respectively an oil inlet of the three-position six-way directional control valve, an oil return port of the three-position six-way directional control valve, a first working oil port of the three-position six-way directional control valve, a second working oil port of the three-position six-way directional control valve, a third working oil port of the three-position six-way directional control valve and a fourth working oil port of the three-position six-way directional control valve, each valve body oil port is communicated with the valve cavity through an independent valve body flow passage arranged in the valve body, the valve rod is provided with four valve rod oil ports matched with the valve rod in position, the four valve rod oil ports are communicated with each other to form two independent flow passages, and the valve rod oil ports are rotatably arranged in the valve cavity.
3. The closed hydraulic control system for injection molding machines with multiple execution units as claimed in claim 2, wherein the valve body comprises a valve housing with a through cavity penetrating from left to right, the left and right ends of the valve housing are respectively provided with a first valve cover and a second valve cover in a sealing manner, the first valve cover and the second valve cover seal the left and right ends of the through cavity, so that the first valve cover, the valve housing and the second valve cover form the closed valve cavity therebetween, and six valve body oil ports are arranged on the valve housing;
first valve gap have first installation department, first installation department tight fit stretch into install the valve case left end, second valve gap second installation department has, first installation department tight fit stretch into install the valve case right-hand member head, the outer wall of first installation department with the inner wall that link up the chamber the outer wall of second installation department with the inner wall that link up the chamber between be provided with the sealing member respectively.
4. The closed hydraulic control system with multiple execution units for injection molding machine according to claim 3, wherein the first installation portion has a first rotation installation cavity, the second installation portion has a second rotation installation cavity, the left and right ends of the valve rod are respectively and coaxially provided with a first rotation installation section and a second rotation installation section, the first rotation installation section is rotatably installed in the first rotation installation cavity, and the second rotation installation section is rotatably installed in the second rotation installation cavity.
5. The closed hydraulic control system for injection molding machines with multiple actuating units as claimed in claim 4, wherein the second valve cover has a sensing chamber coaxial with and communicating with the second rotary installation chamber, the second valve cover has three sensing switches, the three sensing switches respectively correspond to three working positions of the three-position six-way reversing valve, the sensing probes of the three sensing switches are inserted into the sensing chamber, the second rotary installation section is provided with a coaxial sensing section extending rightwards, the sensing section is provided in the sensing chamber, and the sensing section is provided with a sensing screw matched with the sensing switch.
6. The closed hydraulic control system for injection molding machines with multiple actuators as claimed in claim 5, wherein the valve stem is provided with a rotary drive mechanism for rotating the valve stem; the rotary driving mechanism comprises a second servo motor, the second servo motor is connected with a speed reducer, a mounting cavity matched with an output shaft of the speed reducer is coaxially arranged on the second rotary mounting section, and the output shaft of the speed reducer extends into the induction cavity and is tightly mounted in the mounting cavity.
7. The closed hydraulic control system for injection molding machines having multiple actuators as claimed in claim 6, wherein said second servo motor is controlled by a second servo driver, said second servo driver being controlled by a controller, said inductive switch being in electrical signal communication with said controller.
8. The closed hydraulic control system with multiple execution units for the injection molding machine according to claim 1, further comprising an oil supplementing unit, wherein the oil supplementing unit comprises an oil supplementing valve group and an oil supplementing power group, the oil supplementing power group comprises an oil supplementing pump and a three-phase asynchronous motor for driving the oil supplementing pump, and the oil supplementing valve group comprises a first overflow valve, a second overflow valve, a third overflow valve, a fourth overflow valve, a flushing valve, a first check valve and a second check valve;
two oil inlet ends of the flushing valve are respectively connected with the first working oil way and the second working oil way, an oil outlet end of the flushing valve is connected with an oil inlet end of the first overflow valve, and an oil return end of the first overflow valve is connected with the oil tank;
the oil inlet end of the second overflow valve is connected with the first working oil way, and the oil return end of the second overflow valve is connected with the second working oil way; the oil inlet end of the third overflow valve is connected with the second working oil way, and the oil return end of the third overflow valve is connected with the first working oil way; the oil outlet end of the first check valve is connected with the first working oil way, the oil outlet end of the second check valve is connected with the second working oil way, a common oil way formed by connecting the oil inlet ends of the first check valve and the second check valve is connected with the oil outlet end of the oil supplementing pump, and the oil inlet end of the oil supplementing pump is connected with the oil tank;
the oil tank is characterized in that a common oil path formed by connecting the oil inlet ends of the first one-way valve and the second one-way valve is connected with the oil tank through the fourth overflow valve, the common oil path formed by connecting the oil inlet ends of the first one-way valve and the second one-way valve is connected with the oil inlet end of the fourth overflow valve, and the oil return end of the fourth overflow valve is connected with the oil tank.
9. The closed hydraulic control system with multiple actuators for injection molding machine according to claim 8, wherein an oil suction filter is disposed between the oil inlet of the oil supply pump and the oil tank, a first port of the oil suction filter is connected to the oil tank, and a second port of the oil suction filter is connected to the oil inlet of the oil supply pump;
the oil outlet end of the oil replenishing pump is provided with a high-pressure filter, a first port of the high-pressure filter is connected with the oil outlet end of the oil replenishing pump, and a common oil path formed by connecting the oil inlet end of the fourth overflow valve, the oil inlet end of the first one-way valve and the oil inlet end of the second one-way valve is respectively connected with a second port of the high-pressure filter;
the oil return ends of the first overflow valve and the fourth overflow valve are connected with the oil tank through a cooler, the oil return ends of the first overflow valve and the fourth overflow valve are respectively connected with a first port of the cooler, and a second port of the cooler is connected with the oil tank.
10. The closed hydraulic control system for injection molding machines having multiple actuators as claimed in claim 1, wherein the first actuator is a two-way rotary hydraulic motor and the second actuator is an equal-area double-out-rod hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221878297.8U CN218439976U (en) | 2022-07-20 | 2022-07-20 | Closed hydraulic control system with multiple execution units for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221878297.8U CN218439976U (en) | 2022-07-20 | 2022-07-20 | Closed hydraulic control system with multiple execution units for injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218439976U true CN218439976U (en) | 2023-02-03 |
Family
ID=85090843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221878297.8U Active CN218439976U (en) | 2022-07-20 | 2022-07-20 | Closed hydraulic control system with multiple execution units for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218439976U (en) |
-
2022
- 2022-07-20 CN CN202221878297.8U patent/CN218439976U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100424361C (en) | Closed electrohydraulic controlling system | |
| EP3039299B1 (en) | Electro-hydraulic actuator | |
| CN109630504B (en) | Oil inlet and outlet independent control system with pressure compensation function | |
| CN104847750B (en) | Electro-hydraulic combined type linear actuator | |
| CN108412847B (en) | Electro-hydrostatic actuator with load compensation and high position precision and control method | |
| KR20100016505A (en) | Hydroelectric device for closed-loop driving the control jack of a variable compression rate engine | |
| CN110966270A (en) | Digital electro-hydrostatic actuator system | |
| EP1167778B1 (en) | Rotary servo valve and punch press hydraulic servo device using the rotary servo valve | |
| CN111720375A (en) | Precision closed oil-way oil-electricity composite injection molding machine | |
| CN109798270B (en) | Multi-mode energy-saving servo actuator and method for realizing multi-mode energy saving | |
| CN111810468B (en) | Pump control hydraulic system, device and control method of turbine engine | |
| CN218439976U (en) | Closed hydraulic control system with multiple execution units for injection molding machine | |
| CN102168671A (en) | Electrical control variable plunger pump and pump control hydraulic system thereof | |
| CN218462895U (en) | Hydraulic control system for complete injection molding machine | |
| CN115355209A (en) | Closed hydraulic control system with multiple execution units for injection molding machine | |
| KR20060117577A (en) | Hybrid actuator system of electric-hydraulic united control type | |
| CN110332171B (en) | Double-speed valve and double-speed hydraulic system | |
| CN218196805U (en) | Hydraulic control system suitable for injection action of injection molding machine | |
| KR20110124843A (en) | Electric-hydraulic hybrid actuator | |
| CN115352010B (en) | Hydraulic control system for whole injection molding machine | |
| CN112253800A (en) | Multi-way valve and hydraulic distributor thereof | |
| CN216182558U (en) | Hydraulic control system for injection molding machine | |
| CN212360348U (en) | Hydraulic system and device for pump control of steam turbine servomotor | |
| JP2001208004A (en) | Hydraulic drive unit | |
| CN209875591U (en) | Shield tunneling machine propulsion system with single-piston-rod symmetrical hydraulic oil cylinders connected in series |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |