CN-224210466-U - Electric injection molding machine with hydraulic pressure booster cylinder high-pressure mode locking

CN224210466UCN 224210466 UCN224210466 UCN 224210466UCN-224210466-U

Abstract

The invention belongs to the field of injection molding machines, and relates to an electric injection molding machine with a hydraulic pressurizing cylinder and a high-pressure mold locking function, which comprises an injection molding device, a mold closing device and a pressurizing device, wherein the pressurizing device comprises a mold opening and closing oil cylinder, a piston rod is arranged in an oil cavity, the piston rod divides the oil cavity into a liquid inlet cavity and a liquid outlet cavity, the pressurizing cylinder is further provided with the pressurizing cylinder, the pressurizing cavity is divided into an oil return cavity and a pressurizing cavity, the oil return cavity is communicated with the liquid outlet cavity of the mold opening and closing oil cylinder, the pressurizing cavity is communicated with the liquid inlet cavity of the mold opening and closing oil cylinder, a pressurizing push rod is arranged in the pressurizing cavity, the front end part of the pressurizing push rod is provided with a circulating section, an oil groove is arranged in the circulating section, the oil groove is opened towards the front end and is communicated with the pressurizing cavity, a plurality of circulating through holes are formed in the periphery of the rear end part of the circulating section, the inner ends of the circulating through holes are communicated with the oil groove, and the outer ends of the circulating through holes are communicated with the oil return cavity or the pressurizing cavity.

Inventors

MA FENMING
WANG YIFAN

Assignees

温州宏业精机有限公司

Dates

Publication Date: 20260508
Application Date: 20250630

Claims (10)

1. The electric injection molding machine with the hydraulic pressure booster cylinder and the high pressure die locking comprises an injection molding device, a die clamping device and a booster device, and is characterized in that an upper die fixing plate, an upper die, a lower die fixing plate, a floating bottom plate and a lower die holder are sequentially arranged on the die from top to bottom, and the lower die holder is fixed on a frame; The pressurizing device comprises a die opening and closing oil cylinder fixed at the lower end of a lower die holder, an oil cavity is arranged in the die opening and closing oil cylinder, a piston rod is arranged in the oil cavity, the lower end of the piston rod extends out of the lower end of the oil cylinder, the piston rod divides the oil cavity into a liquid inlet cavity and a liquid outlet cavity, the liquid inlet cavity is arranged above the piston rod, the liquid outlet cavity is arranged below the piston rod, the pressurizing device further comprises a pressurizing cylinder, the pressurizing cylinder is internally provided with a pressurizing cavity which is divided into an oil return cavity and a pressurizing cavity, the oil return cavity is communicated with the liquid outlet cavity of the die opening and closing oil cylinder, the pressurizing cavity is communicated with the liquid inlet cavity of the die opening and closing oil cylinder, a pressurizing push rod is arranged in the pressurizing cavity, the pressurizing push rod penetrates through the oil return cavity to enter the pressurizing cavity, the front end part of the pressurizing push rod is provided with a circulating section, the oil groove is arranged in the circulating section, the oil groove is opened towards the front end and is communicated with the pressurizing cavity, the periphery of the rear end of the circulating section is provided with a plurality of circulating through holes, the inner ends of the circulating through holes are communicated with the oil groove, the oil return cavity or the pressurizing cavity, a sealing ring is arranged between the oil return cavity and the pressurizing cavity, the pressurizing push rod passes through the sealing ring, the pressurizing push rod, and the driving device.
2. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure die locking function according to claim 1, wherein the booster device comprises two die opening and closing oil cylinders, two booster ports are arranged in the booster cavity and are respectively communicated with liquid inlet cavities of the two die opening and closing oil cylinders through booster oil pipes.
3. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure die locking function according to claim 1, wherein an oil return opening is arranged in the oil return cavity, a three-way pipe is connected to the oil return opening, one end of the three-way pipe is connected to a nitrogen barrel, and the other end of the three-way pipe is communicated with a liquid outlet cavity of the die opening and closing oil cylinder through an oil return pipe.
4. The electric injection molding machine with the hydraulic pressure booster cylinder high-pressure mold locking function according to claim 1, wherein the booster push rod front-rear driving device comprises a front bearing seat and a rear bearing seat, at least four guide posts are arranged between the front bearing seat and the rear bearing seat, a booster nut seat is sleeved on the four guide posts and can slide back and forth relative to the guide posts, the middle part of the booster nut seat is fixedly connected with a booster screw nut, a booster screw rod is further connected in the booster screw nut in a threaded manner, one end of the booster screw rod extends outwards and is fixedly connected with the output end of a booster servo motor, the rear end of the booster push rod is fixedly connected with the booster nut seat, and the front end of the booster push rod extends into the booster cylinder.
5. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure mold locking function according to claim 4, wherein the booster cylinder comprises a compression section and a gland, a compression cavity is formed in the compression section, an oil return cavity is formed in the gland, the compression section is fixed at the front end of a front bearing seat, the gland is fixed at the rear end of the front bearing seat, a through hole is formed in the front bearing seat and is communicated with the compression cavity and the oil return cavity, a sealing ring is fixed in the through hole, and a booster push rod sequentially penetrates through the oil return cavity of the gland and the sealing ring of the front bearing seat to reach the compression cavity of the compression section.
6. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure die locking function is characterized in that the die locking device comprises at least four upright posts which are in sliding connection with a lower die holder, the four upright posts can slide up and down relative to the lower die holder, the upper die fixing plate is fixedly connected with the upright posts, the lower ends of the four upright posts are fixedly connected with a bottom plate, the lower end of the lower die holder is fixedly connected with a nut fixing seat, a die locking nut is fixedly connected in the nut fixing seat, the middle part of the bottom plate is rotationally connected with a die locking screw rod, the die locking screw rod is axially fixed with the bottom plate, the upper end of the die locking screw rod extends into the nut fixing seat and is in threaded connection with the die locking nut, the lower end of the die locking screw rod is arranged below the bottom plate and is fixedly connected with a synchronous wheel, the lower end of the bottom plate is fixedly connected with a die locking servo motor, the output wheel is connected with the synchronous wheel through a synchronous belt, the die locking servo motor rotates to drive the screw rod to rotate in the die locking nut, so that the bottom plate is driven to move up and down, the upright post is driven to move up and down, and the die locking servo motor drives the upper end to move up and down.
7. The electric injection molding machine with the hydraulic pressure booster cylinder high-pressure mold locking function according to claim 6, wherein the nut fixing seat is of a hollow cylindrical structure, the lower end of the mold clamping nut is fixedly connected with the lower end of the nut fixing seat, the upper end of the mold clamping nut extends into the nut fixing seat, and the lower end of the mold clamping nut is further fixedly provided with a locking ring.
8. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure die locking function according to claim 7, wherein an ejection mechanism is further arranged in the floating bottom plate and comprises an ejector block arranged in the floating bottom plate, an ejection cylinder is fixed in the upper end part of the cavity in the nut fixing seat, and the output end of the ejection cylinder extends upwards to penetrate through the lower die holder and is fixedly connected with the ejector block.
9. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure mold locking function according to claim 6, wherein the mold clamping screw rod is axially fixed and rotationally connected with the bottom plate through two screw rod bearings.
10. The electric injection molding machine with the hydraulic pressure booster cylinder and the high-pressure die lock is characterized in that the lower end of the piston rod extends out of the lower end of the oil cylinder and is fixedly connected with the bottom plate.

Description

Electric injection molding machine with hydraulic pressure booster cylinder high-pressure mode locking Technical Field The utility model belongs to the field of injection molding machines, and relates to an electric injection molding machine with a hydraulic pressure booster cylinder and a high-pressure die locking function. Background Conventional injection molding machines typically consist of an injection system, a mold, a clamping system, and a hydraulic drive system. The hydraulic system is mainly realized by a hydraulic cylinder, and the hydraulic system is mainly used for injection molding and pressure maintaining, so that enough mold locking force is ensured during mold closing. But the hydraulic system occupies a large area and is costly. If the hydraulic system is not used for maintaining pressure, the motor can not bear the large mold locking force, and the motor is easy to wear and damage. Disclosure of Invention According to the problems, the invention provides the electric injection molding machine with the hydraulic pressure cylinder for high-pressure mold locking, and the device has the advantages that the pressure maintaining is realized through the pressure cylinder, the occupied volume is reduced, and the mold locking force is ensured. The purpose of the invention is realized in the following way: The electric injection molding machine with the hydraulic pressure booster cylinder and the high pressure die locking comprises an injection molding device, a die clamping device and a booster device, wherein an upper die fixing plate, an upper die, a lower die fixing plate, a floating bottom plate and a lower die holder are sequentially arranged on the die from top to bottom; The pressurizing device comprises a die opening and closing oil cylinder fixed at the lower end of a lower die holder, an oil cavity is arranged in the die opening and closing oil cylinder, a piston rod is arranged in the oil cavity, the lower end of the piston rod extends out of the lower end of the oil cylinder, the piston rod divides the oil cavity into a liquid inlet cavity and a liquid outlet cavity, the liquid inlet cavity is arranged above the piston rod, the liquid outlet cavity is arranged below the piston rod, the pressurizing device further comprises a pressurizing cylinder, the pressurizing cylinder is internally provided with a pressurizing cavity which is divided into an oil return cavity and a pressurizing cavity, the oil return cavity is communicated with the liquid outlet cavity of the die opening and closing oil cylinder, the pressurizing cavity is communicated with the liquid inlet cavity of the die opening and closing oil cylinder, a pressurizing push rod is arranged in the pressurizing cavity, the pressurizing push rod penetrates through the oil return cavity to enter the pressurizing cavity, the front end part of the pressurizing push rod is provided with a circulating section, the oil groove is arranged in the circulating section, the oil groove is opened towards the front end and is communicated with the pressurizing cavity, the periphery of the rear end of the circulating section is provided with a plurality of circulating through holes, the inner ends of the circulating through holes are communicated with the oil groove, the oil return cavity or the pressurizing cavity, a sealing ring is arranged between the oil return cavity and the pressurizing cavity, the pressurizing push rod passes through the sealing ring, the pressurizing push rod, and the driving device. Through the arrangement, when the circulation through hole of the pressurizing push rod advances to the pressurizing cavity, oil in the oil return cavity cannot enter the pressurizing cavity due to the action of the sealing ring, when the pressurizing push rod continues to advance to squeeze the space of the pressurizing cavity, the oil pressure in the pressurizing cavity is increased, and meanwhile the oil pressure of the liquid inlet cavity in the mold opening and closing oil cylinder is increased, so that the piston rod generates mold locking force acting on the mold. When the circulation through hole of the pressurizing push rod retreats to the oil return cavity, the oil groove of the circulation section is communicated with the pressurizing cavity, the circulation through hole is communicated with the oil groove, and the circulation through hole retreats to the oil return cavity to be communicated with the oil return cavity, so that the pressurizing cavity is communicated with the oil return cavity, no pressurizing effect is generated, oil can circulate freely, and accordingly a piston rod of the mold opening and closing oil cylinder can be reset, and mold opening is facilitated. Therefore, the device has the effect of realizing pressure maintaining through the pressurizing cylinder, not only reducing occupied volume, but also ensuring mold locking force. The pressurizing device is further arranged in a way that the pressurizing devic