阅读说明：本技术 一种环保节能型压铸机电液控制系统 (Environment-friendly energy-saving die casting machine electrohydraulic control system ) 是由 不公告发明人 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种环保节能型压铸机电液控制系统,具体涉及压铸机技术领域,包括传动液箱及装载传动液箱的压铸机,且压铸机还包括一套电液控制系统,所述压射缸组件的顶端分别固定设有蓄能器和增压器,所述电液控制系统包括安装在压射缸组件上的压力传感器和速度传感器,所述控制箱内置PLC控制器,且PLC控制器的外部分别有设有D/A转换器和A/D转换器,所述压射缸组件外部电性连接有比例节流阀,所述蓄能器和压射缸组件之间电性连接有比例减压阀。本发明中,实现速度及压力的无级调节,使得系统的运行更加平稳,发热量有所减小,机体能耗有所降低,更加节能环保,且具有较好的人机交互功能,操作方便,且获得产品的质量较高。(The invention discloses an environment-friendly energy-saving die casting machine electrohydraulic control system, and particularly relates to the technical field of die casting machines, which comprises a transmission liquid box, a die casting machine for loading the transmission liquid box and a set of electrohydraulic control system, wherein the top end of an injection cylinder assembly is respectively and fixedly provided with an energy accumulator and a supercharger, the electrohydraulic control system comprises a pressure sensor and a speed sensor which are arranged on the injection cylinder assembly, a PLC (programmable logic controller) is arranged in the control box, a D/A converter and an A/D converter are respectively arranged outside the PLC, a proportional throttle valve is electrically connected outside the injection cylinder assembly, and a proportional pressure reducing valve is electrically connected between the energy accumulator and the injection cylinder assembly. According to the invention, stepless regulation of speed and pressure is realized, so that the system is more stable to operate, the heat productivity is reduced to some extent, the energy consumption of the machine body is reduced to some extent, the energy is saved, the environment is protected, the man-machine interaction function is better, the operation is convenient, and the quality of the obtained product is higher.)

1. The utility model provides an environmental protection and energy saving type die casting machine electric liquid control system, includes transmission fluid case (1) and the die casting machine of loading transmission fluid case (1), its characterized in that: the die casting machine is characterized by comprising a pressure injection cylinder assembly (2), a die assembly, a PLC control box (3) and a hydraulic pump (30), and further comprising an electro-hydraulic control system, wherein the top end of the pressure injection cylinder assembly (2) is respectively and fixedly provided with an energy accumulator (5) and a supercharger (6), the electro-hydraulic control system comprises a pressure sensor (15) and a speed sensor (17) which are installed on the pressure injection cylinder assembly (2), the control box (3) is internally provided with a PLC controller (16), the outside of the PLC controller (16) is respectively provided with a D/A converter (19) and an A/D converter (20), the pressure sensor (15) and the speed sensor (17) are respectively connected with a signal conditioning circuit (18), and the pressure sensor (15) and the speed sensor (17) are electrically connected with the A/D converter (20) through the signal conditioning circuit (18), the external part of the injection cylinder assembly (2) is electrically connected with a proportional throttle valve (9), a proportional pressure reducing valve (8) is electrically connected between the energy accumulator (5) and the injection cylinder assembly (2), the proportional pressure reducing valve (8) and the proportional throttle valve (9) are respectively and electrically connected with a D/A converter (19), a wireless communication module (24) is arranged in the PLC controller (16), the PLC controller (16) is wirelessly connected with an upper computer (25) and a touch screen (4) through the wireless communication module (24), the touch screen (4) is fixedly arranged on the external part of the control box (3), an external port of the PLC controller (16) is provided with a switching value input port (22) and a switching value output port (23), and the switching value input port (22), a signal conditioning circuit (18), a pressure sensor (15) and a speed sensor (17) form a forward channel of a PLC control system, and a backward channel of the PLC control system is formed among the switching value output port (23), the injection cylinder assembly (2), the proportional pressure reducing valve (8) and the proportional throttle valve (9).

2. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 1, characterized in that: the proportional pressure reducing valve (8) and the proportional throttle valve (9) are all electro-hydraulic proportional control valves, the proportional pressure reducing valve (8) is consistent with the proportional throttle valve (9), the proportional throttle valve (9) comprises a stepping motor (901), a housing (902) is fixedly arranged on the outer surface of one end of the stepping motor (901), a valve seat (903) is fixedly arranged at the other end of the housing (902), a ball screw (904) connected with the stepping motor (901) is arranged inside the housing (902), a connecting rod (905) is fixedly connected to the outside of the ball screw (904), a valve core (907) is fixedly connected to one end of the connecting rod (905), and a valve sleeve (906) is arranged inside the valve seat (903).

3. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 2, characterized in that: an inlet (908) and an outlet (909) are fixedly formed in the outer portion of the valve seat (903), a zero displacement sensor (910) is fixedly mounted at the top end of the shell (902), and the zero displacement sensor (910) is electrically connected with the PLC (16) through a D/A sensor (19).

4. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 1, characterized in that: the hydraulic system is arranged on the transmission liquid box (1) and the die casting machine and comprises a second electromagnetic reversing valve (10) electrically connected with the injection cylinder assembly (2), the injection cylinder assembly (2) and the energy accumulator (5) are provided with a first electromagnetic reversing valve (7), the energy accumulator (5) and the supercharger (6) are provided with fourth electromagnetic reversing valves (14), and overflow valves (13) are connected in series to the outer portions of the fourth electromagnetic reversing valves (14).

5. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 4, characterized in that: the outsides of the two fourth electromagnetic directional valves (14) are respectively connected with a third electromagnetic directional valve (11), and the outsides of the two third electromagnetic directional valves (11) are respectively connected with a proportional combination valve (12).

6. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 1, characterized in that: the injection cylinder assembly (2) comprises a base shell (201), an energy accumulator (5) and a supercharger (6) are fixedly arranged on the base shell (201), the energy accumulator (5), the supercharger (6) and the base shell (201) are arranged in a penetrating mode, a supercharging piston (204) is arranged at one end, close to the supercharger (6), of the inside of the base shell (201), a base (205) is fixedly arranged on one side, close to the supercharging piston (204), of the inside of the base shell (201), a supercharging piston rod (206) is transversely inserted into the inside of the base (205), and the supercharging piston rod (206) is fixedly connected with the supercharging piston (204).

7. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 6, characterized in that: the outer side wall of one side of the base shell (201) is fixedly provided with a sleeve (210), a floating piston (209) is arranged inside the sleeve (210), and one end, far away from the pressurizing piston (204), of the pressurizing piston rod (206) is fixedly connected with the floating piston (209).

8. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 7, characterized in that: a piston (207) is inserted into the sleeve (210), a material injection punch (208) is fixedly arranged at one end, penetrating through the sleeve (210), of the piston (207), a material injection chamber (202) is inserted into the outer portion of the material injection punch (208), and a pouring gate (203) is formed in one end, close to the material injection punch (208), of the top end of the material injection chamber (202).

9. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 8, characterized in that: penetrate material room (202) and keep away from one end fixedly connected with die holder (26) of penetrating material drift (208), one side of die holder (26) is fixed and is equipped with movable mould seat (27), the outside fixed mounting of control box (3) has die clamping cylinder (29), the fixed support bedplate (33) that is equipped with of one end that control box (3) were kept away from in die clamping cylinder (29), and support and be equipped with connecting rod hinge (28) between bedplate (33) and movable mould seat (27).

10. The electro-hydraulic control system of the environmental-friendly energy-saving die casting machine according to claim 6, characterized in that: a clamping rod (32) and a clamping seat (31) which are clamped with each other are arranged between one end, close to the pressurizing piston (204), of the base (205) and the pressurizing piston (204), and a spring (21) is fixedly arranged between one end, close to the pressurizing piston (204), of the base (205) and the pressurizing piston (204) and on the inner side of the clamping rod (32) and the clamping seat (31).

Technical Field

The invention relates to the technical field of die casting machines, in particular to an environment-friendly energy-saving die casting machine electrohydraulic control system.

Background

A die casting machine is an industrial casting apparatus that presses an alloy liquid under pressure into a die that is mounted on a die plate and maintains the high pressure until it solidifies to form a product. Die casting machines can be classified into various types according to a pouring method, a pressure chamber arrangement form, and the like. They are roughly classified into cold chamber die casting machines, hot type die casting machines, horizontal cold chamber die casting machines, vertical cold type die casting machines, and the like.

The important function of the control system of the die casting machine is to detect the working conditions of various inductive switches, electronic scales, buttons and various sensors in real time in the die casting production process, and issue control commands according to corresponding programs to execute the control of the opening, closing and opening size of corresponding hydraulic valves to complete the whole die casting operation process, and the hydraulic system of the die casting machine is the core of the whole system and provides energy for the whole machine to drive the normal operation of components such as a die adjusting mechanism, a die locking mechanism, a push-out mechanism, an injection mechanism and the like;

therefore, in order to improve the quality of a cast product, considering the dynamic and static characteristics of a hydraulic control device, the accuracy of a control system, effective adjustment of die casting parameters and the like, production practices prove that die castings with clear outlines and compact structures mainly depend on reasonable regulation and control of an injection process, and therefore an environment-friendly and energy-saving die casting machine electrohydraulic control system is provided.

Disclosure of Invention

Therefore, the invention provides an electro-hydraulic control system of an environment-friendly energy-saving die casting machine, and aims to solve the problems that an existing electro-hydraulic control system of the die casting machine is poor in effective regulation effect, product quality is difficult to improve, and the energy consumption of the die casting machine is high.

In order to achieve the above purpose, the invention provides the following technical scheme:

according to the first aspect of the invention, the electro-hydraulic control system of the environment-friendly energy-saving die casting machine comprises a transmission liquid tank and a die casting machine for loading the transmission liquid tank, wherein the die casting machine comprises a pressure injection cylinder assembly, a die assembly, a PLC (programmable logic controller) control box and a hydraulic pump, the electro-hydraulic control system also comprises a set of electro-hydraulic control system, the top end of the pressure injection cylinder assembly is respectively and fixedly provided with an energy accumulator and a supercharger, the electro-hydraulic control system comprises a pressure sensor and a speed sensor which are arranged on the pressure injection cylinder assembly, the PLC control box is internally provided with a PLC, the outside of the PLC is respectively provided with a D/A converter and an A/D converter, the pressure sensor and the speed sensor are respectively connected with a signal conditioning circuit, the pressure sensor and the speed sensor are electrically connected with the A/D converter through the signal conditioning circuit, the PLC is characterized in that a proportional pressure reducing valve is electrically connected between the energy accumulator and the injection cylinder assembly, the proportional pressure reducing valve and the proportional throttle valve are electrically connected with a D/A converter respectively, a wireless communication module is arranged in the PLC, the PLC is wirelessly connected with an upper computer and a touch screen through the wireless communication module, the touch screen is fixedly installed outside the control box, an external port of the PLC is provided with a switching value input port and a switching value output port, the switching value input port, the signal conditioning circuit, the pressure sensor and the speed sensor form a forward channel of the PLC control system, and a backward channel of the PLC control system is formed among the switching value output port, the injection cylinder assembly, the proportional pressure reducing valve and the proportional throttle valve.

Furthermore, the proportion relief pressure valve all chooses the electric liquid proportional control valve for use with the proportion choke valve, and the proportion relief pressure valve is unanimous with the proportion choke valve structure, the proportion choke valve includes step motor, step motor's one end external surface is fixed and is equipped with the shell, the other end of shell is fixed and is equipped with the disk seat, and the inside of shell is equipped with the ball screw that is connected with step motor, ball screw's outside fixedly connected with connecting rod, the one end fixedly connected with case of connecting rod, the inside of disk seat is equipped with the valve barrel.

Further, the outside of disk seat is fixed and is seted up import and export, the top fixed mounting of shell has zero displacement sensor, zero displacement sensor passes through DA sensor and PLC controller electric connection.

Furthermore, a hydraulic system is arranged on the transmission liquid box and the die casting machine, the hydraulic system comprises a second electromagnetic reversing valve electrically connected with the injection cylinder assembly, a first electromagnetic reversing valve is arranged between the injection cylinder assembly and the energy accumulator, fourth electromagnetic reversing valves are arranged outside the energy accumulator and the supercharger, and an overflow valve is connected in series with the fourth electromagnetic reversing valve.

Furthermore, the outsides of the two fourth electromagnetic directional valves are respectively connected with a third electromagnetic directional valve, and the outsides of the two third electromagnetic directional valves are respectively connected with a proportional combination valve.

Further, the injection cylinder assembly comprises a base shell, the energy accumulator and the supercharger are fixedly arranged on the base shell, the energy accumulator, the supercharger and the base shell are arranged in a penetrating mode, a supercharging piston is arranged at one end, close to the supercharger, of the inside of the base shell, a base is fixedly arranged on one side, close to the supercharging piston, of the inside of the base shell, a supercharging piston rod is transversely inserted into the inside of the base, and the supercharging piston rod is fixedly connected with the supercharging piston.

Further, a sleeve is fixedly mounted on the outer side wall of one side of the base shell, a floating piston is arranged inside the sleeve, and one end, far away from the pressurizing piston, of the pressurizing piston rod is fixedly connected with the floating piston.

Furthermore, a piston is inserted into the sleeve, an injection punch is fixedly arranged at one end of the piston penetrating through the sleeve, an injection chamber is inserted outside the injection punch, and a pouring gate is formed in one end, close to the injection punch, of the top end of the injection chamber.

Further, the one end fixedly connected with die holder of penetrating the material drift is kept away from to the material shooting room, the fixed movable die holder that is equipped with in one side of die holder, the outside fixed mounting of control box has the matched die jar, the fixed support bedplate that is equipped with of one end that the control box was kept away from to the matched die jar, and the fixed connecting rod hinge that is equipped with between support bedplate and the movable die holder.

Furthermore, a clamping rod and a clamping seat which are mutually clamped are arranged between one end, close to the pressurizing piston, of the base and the pressurizing piston, and a spring is fixedly arranged between one end, close to the pressurizing piston, of the base and the pressurizing piston and between the end, close to the pressurizing piston, of the base and the inner side, located between the clamping rod and the clamping seat.

The invention has the following advantages:

1. the current injection speed and oil pressure are detected by the speed sensor and the pressure sensor, the analog electric signal is converted into a digital quantity voltage signal by the A/D converter through the information conditioning circuit and is input into the PLC controller, the signal is compared with a reference signal by calculation, then the controller outputs a corresponding control voltage signal, the control signal is converted into an analog current signal through the D/A converter and acts on the proportional throttle valve and the proportional pressure reducing valve, and therefore the operation state of the die casting machine is directly mastered by adjusting the speed and the pressure in the injection process, technological parameters are conveniently modified, the machine-computer interaction function is good, and the operation is convenient.

2. Through improving the hydraulic system to the die casting machine, select for use proportion relief pressure valve and proportion choke valve through the setting to adopt PLC controller control operation, convenient nimble regulation controlled parameter accomplishes the closed-loop control of parameter, with the infinitely variable control who realizes speed and pressure, make the operation of system more steady, calorific capacity reduces to some extent, and the organism energy consumption reduces to some extent, and is more energy-concerving and environment-protective.

2. Through the spring, the clamping seat and the clamping piece which are arranged, when the ejection punch head in the injection cylinder assembly is retracted, the clamping seat can be ensured to be reset quickly and clamped with the clamping rod under the action of the elastic force of the spring, the reaction time of the injection cylinder assembly is shortened, the injection speed is improved, and products with smooth appearance, compact structure and clear outline are obtained easily.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic view of the overall structure of a die casting machine according to the present invention;

FIG. 2 is a cross-sectional view of the shot cylinder assembly provided by the present invention;

FIG. 3 is a schematic diagram of a hydraulic system provided by the present invention;

FIG. 4 is a cross-sectional view of a proportional throttle valve provided by the present invention;

FIG. 5 is a block diagram of an electro-hydraulic proportional control system provided by the present invention;

FIG. 6 is a block diagram of a control system for a die casting machine according to the present invention;

FIG. 7 is a schematic view of the structure of portion A of FIG. 6 according to the present invention;

in the figure: 1. a transmission fluid tank; 2. an injection cylinder assembly; 201. a base shell; 202. a material injection chamber; 203. a pouring gate; 204. a booster piston; 205 a base; 206. a booster piston rod; 207. a piston; 208. a material injection punch; 209. a floating piston; 210. a sleeve 3 and a control box; 4. a touch screen; 5. an accumulator; 6. a supercharger; 7. a first electromagnetic directional valve; 8. a proportional pressure reducing valve; 9. a proportional throttle valve; 901. a stepping motor; 902. a housing; 903. a valve seat; 904. a ball screw; 905. a connecting rod; 906. a valve housing; 907. a valve core; 908. an inlet; 909. an outlet; 910. a zero displacement sensor; 10. a second electromagnetic directional valve; 11. A third electromagnetic directional valve; 12. a proportional combination valve; 13. an overflow valve; 14. a fourth electromagnetic directional valve; 15. A pressure sensor; 16. a PLC controller; 17. a speed sensor; 18. a signal conditioning circuit; 19. a D/A converter; 20. an A/D converter; 21. a spring; 22. inputting a switching value; 23. outputting the switching value; 24. a wireless communication module; 25. an upper computer; 26. fixing a die holder; 27. a movable die holder; 28. a connecting rod hinge; 29. A mold clamping cylinder; 30. a hydraulic pump; 31. a card holder; 32. a clamping rod; 33. and supporting the seat board.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to the attached drawings 1-5 of the specification, the electro-hydraulic control system of the environment-friendly energy-saving die casting machine of the embodiment comprises a transmission liquid box 1 and a die casting machine for loading the transmission liquid box 1, wherein the die casting machine comprises a pressure injection cylinder assembly 2, a die assembly, a PLC (programmable logic controller) control box 3 and a hydraulic pump 30, the die casting machine further comprises a set of electro-hydraulic control system, the top end of the pressure injection cylinder assembly 2 is fixedly provided with an energy accumulator 5 and a supercharger 6 respectively, the electro-hydraulic control system comprises a pressure sensor 15 and a speed sensor 17 which are installed on the pressure injection cylinder assembly 2, the PLC control box 3 is internally provided with a PLC 16, the PLC 16 is externally provided with a D/A converter 19 and an A/D converter 20 respectively, the pressure sensor 15 and the speed sensor 17 are connected with a signal conditioning circuit 18 respectively, and the pressure sensor 15 and the speed sensor 17 are electrically connected with the A/D converter, the outside of the injection cylinder assembly 2 is electrically connected with a proportional throttle valve 9, a proportional pressure reducing valve 8 is electrically connected between the energy accumulator 5 and the injection cylinder assembly 2, the proportional pressure reducing valve 8 and the proportional throttle valve 9 are respectively electrically connected with a D/A converter 19, a wireless communication module 24 is arranged in the PLC 16, and the PLC controller 16 is wirelessly connected with an upper computer 25 and the touch screen 4 through a wireless communication module 24, the touch screen 4 is fixedly arranged outside the control box 3, the external port of the PLC 16 is provided with a switching value input port 22 and a switching value output port 23, the switching value input port 22, the signal conditioning circuit 18, the pressure sensor 15 and the speed sensor 17 form a forward channel of the PLC control system, and a backward channel of the PLC control system is formed among the switching value output port 23, the injection cylinder assembly 2, the proportional pressure reducing valve 8 and the proportional throttle valve 9.

Further, the proportional pressure reducing valve 8 and the proportional throttle valve 9 both adopt an electro-hydraulic proportional control valve, the proportional pressure reducing valve 8 and the proportional throttle valve 9 are identical in structure, the proportional throttle valve 9 comprises a stepping motor 901, a housing 902 is fixedly arranged on the outer surface of one end of the stepping motor 901, a valve seat 903 is fixedly arranged at the other end of the housing 902, a ball screw 904 connected with the stepping motor 901 is arranged inside the housing 902, a connecting rod 905 is fixedly connected to the outside of the ball screw 904, a valve core 907 is fixedly connected to one end of the connecting rod 905, and a valve sleeve 906 is arranged inside the valve seat 903.

Further, an inlet 908 and an outlet 909 are fixedly formed outside the valve seat 903, a zero displacement sensor 910 is fixedly mounted at the top end of the housing 902, and the zero displacement sensor 5 and the zero displacement sensor 910 are electrically connected with the PLC controller 16 through the D/a sensor 19.

Furthermore, a hydraulic system is arranged on the transmission fluid tank 1 and the die casting machine, the hydraulic system comprises a second electromagnetic directional valve 10 electrically connected with the injection cylinder assembly 2, a first electromagnetic directional valve 7 is arranged between the injection cylinder assembly 2 and the energy accumulator 5, fourth electromagnetic directional valves 14 are arranged outside the energy accumulator 5 and the supercharger 6, an overflow valve 13 is connected in series outside the fourth electromagnetic directional valve 14, the safe pressure of the main energy accumulator and the supercharged energy storage can be set, during the die casting operation, if the energy storage pressure exceeds the safe set pressure, the energy accumulator automatically unloads, and if the power is suddenly cut off, the electromagnetic unloading valve acts during the system operation, the pressure oil in the energy accumulator is put back to the oil tank, so that the power-off protection effect is achieved.

Furthermore, the outsides of the two fourth electromagnetic directional valves 14 are respectively connected with the third electromagnetic directional valves 11, and the outsides of the two third electromagnetic directional valves 11 are both connected with the proportional combination valve 12, so that the processing speed is high, the programmable control can be performed, and the operation is convenient.

The implementation scenario is specifically as follows: firstly, a hydraulic system and an electrohydraulic control system for providing energy for the complete machine and determining the normal operation of an injection cylinder assembly 2, an energy accumulator 5 and a supercharger 6 are arranged on a transmission liquid tank 1 and a die casting machine for loading the transmission liquid tank 1, a hydraulic pump 20 is matched with a proportional pressure reducing valve 8 and a proportional throttle valve 9 to adjust parameters of the energy accumulator 5 and the supercharger 6, the pressure control mode of the energy accumulator 5 is changed from open loop to closed loop, pressure sensors 15 are respectively arranged outside the energy accumulator 5 and the supercharger 6 to detect the pressure when the energy accumulator 5 stores energy and feed back to a PLC (programmable logic controller) 16, the PLC 16 is used for comparing the measured value with a set value, the energy storage is stopped when the requirement is met, otherwise, the energy storage is continued, in addition, when a second electromagnetic reversing valve 10 is positioned at the middle position, the energy accumulator 5 and the supercharger 6 can be respectively stored through two third electromagnetic reversing valves 11, in the rapid injection stage, the energy accumulator 5 is opened through opening, the booster 6 can be opened through the proportional pressure reducing valve 8 to complete the boosting operation in the pressure boosting injection stage, the pushing out and the withdrawing of the injection punch 208 in the injection cylinder assembly 2 can be realized through the reversing action of the second electromagnetic directional valve 10, the speed in the rapid injection stage and the pressure in the pressure boosting injection stage are respectively controlled by the proportional throttle valve 9 and the proportional pressure reducing valve 8, the controlled parameters are conveniently and flexibly adjusted, the closed-loop control of the parameters is completed, the control of the rapid injection speed selects an outlet throttling control mode, the speed control system consists of the proportional throttle valve 9, the speed sensor 17 and the PLC 16, the stepless adjustment of the speed is realized by adjusting the opening degree of a valve core 907 of the proportional throttle valve 9, the pressure control system consists of the proportional pressure reducing valve 8, the pressure sensor 15 and the PLC 6, and the stepless adjustment of the pressure is realized by adjusting the opening degree of, the oil after throttling is small in heating integrally, energy consumption loss of a die casting machine is reduced, and energy conservation and environmental protection are achieved;

the electro-hydraulic control system controls the die casting operation of the die casting machine, the injection control system aims to adjust the parameters of the injection stage according to the technological requirements of the product to enable the parameters to reach the control requirements, in order to realize the closed-loop control of the speed and the pressure, the current injection speed and the oil pressure are detected through a speed sensor 17 and a pressure sensor 15 respectively, an analog electric signal is converted into a digital quantity voltage signal through an information conditioning circuit 18 by an A/D converter 20 and is input into a PLC (programmable logic controller) 16, the signal is calculated and compared with a reference signal, then the controller outputs a corresponding control voltage signal, the control signal is converted into an analog current signal through a D/A converter 19 and acts on a proportional throttle valve 9 and a proportional pressure reducing valve 8, the speed and the pressure in the injection process are adjusted, and meanwhile, the PLC 16 is connected with an upper computer 25 and a touch screen 4 through a wireless communication module 24, the running state of the die casting machine is directly mastered, the process parameters are convenient to modify, the man-machine interaction function is good, and the operation is convenient.

Referring to the description and the accompanying drawings 1, 6 and 7, in the electro-hydraulic control system of the environment-friendly and energy-saving die casting machine of the embodiment, the injection cylinder assembly 2 includes a base shell 201, the energy accumulator 5 and the supercharger 6 are fixedly arranged on the base shell 201, the energy accumulator 5, the supercharger 6 and the base shell 201 are arranged in a penetrating manner, a supercharging piston 204 is arranged at one end of the inside of the base shell 201 close to the supercharger 6, a base 205 is fixedly arranged at one side of the inside of the base shell 201 close to the supercharging piston 204, a supercharging piston rod 206 is transversely inserted into the inside of the base 205, and the supercharging piston rod 206 is fixedly connected with the supercharging piston 204.

Further, a sleeve 210 is fixedly installed on the outer side wall of one side of the base shell 201, a floating piston 209 is arranged inside the sleeve 210, and one end, far away from the booster piston 204, of the booster piston rod 206 is fixedly connected with the floating piston 209.

Further, a piston 207 is inserted into the sleeve 210, a material injection punch 208 is fixedly arranged at one end of the piston 207 penetrating through the sleeve 210, a material injection chamber 202 is inserted outside the material injection punch 208, and a pouring port 203 is formed at one end of the top end of the material injection chamber 202 close to the material injection punch 208.

Further, one end of the injection chamber 202, which is far away from the injection punch 208, is fixedly connected with a fixed die holder 26, one side of the fixed die holder 26 is fixedly provided with a movable die holder 27, the outside of the control box 3 is fixedly provided with a die clamping cylinder 29, one end of the die clamping cylinder 29, which is far away from the control box 3, is fixedly provided with a support seat plate 33, and a connecting rod hinge 28 is fixedly arranged between the support seat plate 33 and the movable die holder 27.

Further, a clamping rod 32 and a clamping seat 31 which are clamped with each other are arranged between one end of the base 205 close to the booster piston 204 and the booster piston 204, and a spring 21 is fixedly arranged between one end of the base 205 close to the booster piston 204 and on the inner side of the clamping rod 32 and the clamping seat 31.

The implementation scenario is specifically as follows: oil in the accumulator 5 is stored and then injected into the base shell 201, meanwhile, the oil in the supercharger 6 is fully pressurized and stored and then pushed into the base shell 201, and pushes the booster piston 204 to push the booster piston rod 205 to push the floating piston 209, so that the injection punch 207 connected with the piston 207 quickly pushes the alloy liquid injected into the injection chamber 202 through the pouring gate 203, so that the alloy liquid is injected between the fixed die holder 26 and the movable die holder 27, and the whole die casting process is completed after the die-clamping cylinder 29 is pressurized and molded, at this time, a clamping rod 32 and a clamping seat 31 which are clamped with each other are arranged between one end of the base 205 close to the booster piston 204 and the booster piston 204, the booster piston 204 is close to the extrusion spring 21 towards the base 205 under the pushing of the oil, the clamping seat 31 slides on the outer surface of the clamping rod 32, and when the injection punch 208 in the injection cylinder assembly 2 is retracted through the reversing action of the second electromagnetic reversing valve, due to the elastic force of the spring 21, the quick reset of the clamping seat 31 and the clamping of the clamping rod 32 can be ensured, the reaction time of the injection cylinder assembly 2 is shortened, the injection speed is improved, and a product with smooth appearance, compact structure and clear outline is easy to obtain.

The working principle is as follows:

referring to the attached figures 1-5 of the specification, in order to realize the closed-loop control of speed and pressure, the current injection speed and oil pressure are detected by a speed sensor 17 and a pressure sensor 15 respectively, an analog electric signal is converted into a digital quantity voltage signal by an A/D converter 20 through an information conditioning circuit 18 and is input into a PLC (programmable logic controller) 16, the digital quantity voltage signal is calculated and compared with a reference signal, then the controller outputs a corresponding control voltage signal, the control signal is converted into an analog current signal through a D/A converter 19 and acts on a proportional throttle valve 9 and a proportional pressure reducing valve 8, so as to adjust the speed and the pressure in the injection process, meanwhile, the PLC 16 is connected with an upper computer 25 and a touch screen 4 through a wireless communication module 24, the operation state of the die casting machine is directly mastered, the technological parameters are convenient to modify, and the better man-machine interaction, the operation is convenient.

Referring to the accompanying drawings of the specification 1, 6 and 7, a clamping rod 32 and a clamping seat 31 which are clamped with each other are arranged between one end, close to a pressurizing piston 204, of a base 205 and the pressurizing piston 204, the pressurizing piston 204 is pushed by oil to be close to an extrusion spring 21 towards the base 205, the clamping seat 31 slides on the outer surface of the clamping rod 32, and when a shot punch 208 in a shot cylinder assembly 2 is retracted, due to the elastic force of the spring 21, the clamping seat 31 can be quickly reset and kept clamped with the clamping rod 32, the reaction time of the shot cylinder assembly 2 is shortened, the shot speed is improved, and products with smooth appearance, compact structure and clear outline are easily obtained.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.