CN203752404U - Electro-hydraulic compound injection molding machine - Google Patents

Abstract

The utility model relates to an electricity liquid combined type injection moulding machine, including fuselage, closing die device, compound die actuating system and plastify injection apparatus, the compound die actuating system is servo economizer system, plastify injection apparatus is electronic plastify injection apparatus. The die assembly driving system comprises a servo motor, a servo driver and an oil pump, wherein the servo motor is electrically connected with the servo driver, the servo motor is in transmission connection with the oil pump, a pump port of the oil pump is respectively communicated with an oil tank and a hydraulic pipeline, and the oil pump provides hydraulic driving energy for the die moving oil cylinder, the die locking oil cylinder, the ejection oil cylinder, the pressurization oil cylinder and the injection oil cylinder through the hydraulic pipeline; the plasticizing injection device comprises a machine barrel assembly, a hopper seat, a frame, a screw, a storage motor, an injection movable plate and an injection motor. The utility model discloses simple structure, accurate, response are quick, energy-conserving, environmental protection, low noise, need not transfer advantages such as mould and mould life height, and it shortens the shaping cycle 30 ~ 40% than ordinary type injection molding machine, and is energy-conserving 40 ~ 70%.

Description

Electro-hydraulic compound injection molding machine

technical field

The utility model relates to plastic molding equipment, in particular to an electro-hydraulic composite injection molding machine.

Background technique

The injection molding industry is facing a rapid development opportunity. In the cost structure of injection molding products, electricity costs account for a considerable proportion. The power consumption of traditional injection molding machine oil pump motors accounts for as high as 65% to 80% of the total equipment power consumption. With the increasing attention to energy issues, especially the concept of circular economy in my country recently, saving energy has become more and more important. Therefore, environmental protection and energy saving have become an important direction for the development of injection molding machines. For a long time, full hydraulic injection molding machines have occupied a dominant position in the injection molding machine market. However, with the development of all-electric injection molding machines, all-hydraulic injection molding machines are increasingly challenged. However, both injection molding machines have their own advantages and disadvantages.

The full hydraulic injection molding machine has many unique advantages in forming precision and complex-shaped products. It has developed from the traditional single-cylinder liquid-filled type and multi-cylinder liquid-filled type to the current two-platen direct pressure type, of which the two-platen direct pressure The most representative type, but its control technology is difficult, the machining precision is high, and the hydraulic technology is also difficult to master.

The all-electric injection molding machine has a series of advantages, especially in terms of environmental protection and energy saving. Due to the use of servo motors, the injection control precision is high, the speed is relatively stable, and it can be adjusted in multiple stages. However, the service life of the all-electric injection molding machine is not as good as that of the all-hydraulic injection molding machine, and the full-hydraulic injection molding machine must use a servo valve with closed-loop control to ensure accuracy. The servo valve is expensive and the cost is too high.

Utility model content

The purpose of this utility model is to provide an electro-hydraulic compound injection molding machine with simple and reasonable structure, which integrates the advantages of full hydraulic press and full electric motor, realizes precision and flexibility, wide application range, fast, energy saving, environmental protection and low noise. Forming machine to overcome the deficiencies of the prior art.

The purpose of this utility model is achieved in that:

An electro-hydraulic composite injection molding machine, comprising a body, a mold clamping device, a mold clamping drive system and a plasticizing injection device, the mold clamping device is provided with a bracket, a movable platen and a fixed platen in sequence, and the bracket and the fixed platen are arranged on the body On the top, the bracket and the fixed template are connected by a tie rod, and the movable template is slidably set on the tie rod, and the surface of the movable template facing the bracket is provided with a mold-moving cylinder, a mold-locking cylinder and an ejecting cylinder; the plasticizing injection device is slidably set on the machine body, A shooting oil cylinder for controlling the overall movement of the plasticizing injection device is arranged between the fixed platen and the injection head plate, and it is characterized in that: the mold clamping drive system is a servo energy-saving system, which includes a servo motor, a servo drive and an oil pump, and the servo motor It is electrically connected with the servo driver, the servo motor is connected with the oil pump transmission, the pump port of the oil pump is respectively connected with the oil tank and the hydraulic pipeline, and the oil pump is used for the mold transfer cylinder, the mold clamping cylinder, the ejector cylinder, the booster cylinder and the hydraulic pipeline through the hydraulic pipeline. The shooting cylinder provides hydraulic driving energy, and the booster cylinder provides high pressure for the clamping cylinder. The plasticizing injection device is an electric plasticizing injection device, which includes a barrel assembly, a hopper seat, a frame, a screw, a material storage motor, an injection moving plate and an injection motor, and the barrel assembly is fixedly arranged at the outer end of the frame and points to a fixed The outer end surface of the formwork; the hopper seat is set on the barrel assembly and communicates with the inside of the barrel assembly; the screw is inserted into the barrel assembly and connected to the storage motor drive, the storage motor is set on the storage motor bracket, and the storage motor The bracket is set on the injection moving plate, the injection moving plate is slidingly set on the frame, and the frame is slidingly matched with the body; the injection motor is set on the injection motor bracket, the injection motor bracket is set on the frame, and the injection motor is connected with the injection moving plate. To control the sliding of the injection moving plate on the frame.

The pump port of the oil pump includes an oil suction port and an oil outlet port, the oil suction port communicates with the oil tank, and the oil outlet port communicates with the hydraulic pipelines of each oil cylinder through a control valve.

The storage motor bracket is fixedly arranged on the injection movable plate, and the distance between the center of the material storage motor support and the center of the injection movable plate is adjustable.

The frame of the electric plasticizing injection device includes an injection head plate, a guide post and an injection tail plate, the injection head plate and the injection tail plate are fixedly arranged at both ends of the guide post, and the injection head plate and the injection tail plate are arranged on the linear guide rail, and the straight line The guide rail is connected with the fuselage, and the injection movable plate is arranged between the injection head plate and the injection tail plate, and is slidably matched with the guide post.

The storage motor is connected to the screw through the storage deceleration transmission pair, the injection motor is connected to the injection moving plate through the injection deceleration transmission pair and the ball screw transmission pair in turn, the injection motor bracket is set on the injection tail plate, and the center of the injection motor bracket The distance from the center of the injection tail plate is adjustable; a transmission seat and an injection force measuring plate are also arranged between the ball screw transmission pair and the injection moving plate.

The reduction ratios of the storage deceleration transmission pair and the injection deceleration transmission pair are both 3:1.

The mold clamping device is a four-cylinder full hydraulic structure, which includes four tie rods, each tie rod is arranged in parallel and fixed on the four corners of the fixed template and the rear support through the four corners of the movable template.

There are four clamping oil cylinders, and the cylinder body of each clamping cylinder is respectively set on the outside of a pull rod and fixed on the movable template. The piston of the clamping cylinder is fixed on the pull rod, and the piston divides the cylinder body into a front cavity and a The rear cavity, the front cavity and the rear cavity are connected by a cartridge valve, and the cartridge valve connects or disconnects the front cavity and the rear cavity during mold opening and closing or high-pressure mold clamping.

There are two mold-moving cylinders. The mold-moving cylinders are installed between the movable template and the support. The mold-moving cylinders are on the same level as the clamping cylinders. The front cavities of the two mold-moving cylinders communicate with each other. The back cavities of the oil cylinders communicate with each other.

The ejection oil cylinder is provided with one, which is located on the center of the moving template.

The booster cylinder provides high pressure for the four clamping cylinders, and the booster cylinders communicate with the oil pump and the clamping cylinder respectively through the control valve oil circuit.

The mold clamping device and the electric plasticizing injection device lie on the fuselage, and the servo energy-saving system, pressurized oil cylinder and oil tank are arranged in the fuselage, wherein the servo energy-saving system is located under the electric plasticizing injection device.

The shooting oil cylinder is replaced by a motor drive mechanism to adjust the displacement of the electric plasticizing injection device through the motor drive mechanism.

The beneficial effects of the utility model are as follows.

(1) The utility model has the advantages of simple structure, precision, fast response, energy saving, environmental protection, low noise, no need for mold adjustment and long service life of the mold. It shortens the molding cycle by 30-40% and saves energy by 40-70% compared with ordinary injection molding machines. .

(2) Adopting the design concept of four-cylinder full hydraulic clamping structure, electric plasticizing injection device and servo energy-saving system drive, combining the advantages of full hydraulic press and full electric motor, the pressure and speed of each action process are under real-time closed-loop control , real-time detection and feedback.

(3) This type of electro-hydraulic compound injection molding machine has high injection pressure, high precision and powerful power. It has remarkable effect and good quality on molding some transparent, easy-to-shrink and deform products and thin-walled products.

(4) Wide range of applications. Due to the large opening and closing stroke and no need for mold adjustment, it can be suitable for deep cavity or various products with complex shapes; it is easy to install inserts, hinges, etc., which is conducive to the molding of products with special requirements. ; Open the mold a little after injection and before pressure holding, which is beneficial to the exhaust of the product, and can be used to form plastic products that are prone to gas generation.

(5) The low-pressure mold protection is accurate and reliable, the service life of the whole machine and the mold is significantly improved, and the pressure has been released before the mold is opened, which reduces the vibration when the mold is opened.

(6) Energy saving, environmental protection, and low noise. After adopting the servo system, it can save 90% of the energy when maintaining pressure, and at least 50% in other actions.

(7) Easy to operate and easy to maintain.

(8) The structure is simple, the price is cheap, it is good for promotion, and it has obvious social benefits and application prospects.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

FIG. 2 is a schematic top view of the structure of FIG. 1 .

FIG. 3 is a schematic view of the right view of FIG. 1 .

Fig. 4 is a block diagram of the cyclic work flow of the utility model.

Fig. 5 is a pressure diagram of the oil circuit in the working process of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Referring to Figures 1 to 3, an electro-hydraulic composite injection molding machine includes a body 27, a mold clamping device, a mold clamping drive system, and a plasticizing injection device. The mold clamping device is provided with a bracket 1 and a movable template 5 in sequence. and the fixed template 8, the bracket 1 and the fixed template 8 are arranged on the fuselage 27, the bracket 1 is connected with the fixed template 8 through the pull rod 6, the movable template 5 is slidably arranged on the pull rod 6, and the movable template 5 is provided on the surface facing the support 1 Mold shifting cylinder 2, clamping cylinder 3 and ejecting cylinder 4; the plasticizing injection device is slidably arranged on the body 27, and a shooting device for controlling the overall movement of the plasticizing injection device is provided between the fixed platen 8 and the injection head plate 11. Oil cylinder 9, the mold clamping drive system is a servo energy-saving system 28, which includes a servo motor 29 (permanent magnet synchronous servo motor 29), a servo driver 30 and an oil pump 31, the servo motor 29 and the servo driver 30 are electrically connected, and the servo motor 29 It is connected to the oil pump 31 in transmission, and the pump port of the oil pump 31 is respectively connected with the oil tank 32 and the hydraulic pipeline. The oil cylinder 9 provides hydraulic driving energy, and the pressurized oil cylinder provides high pressure for the clamping oil cylinder. The plasticizing injection device is an electric plasticizing injection device, which includes a barrel assembly 33, a hopper seat 10, a frame, a screw 12, a storage motor 17, an injection moving plate 18 and an injection motor 35, and the barrel assembly 33 is fixedly arranged on The outer end of the frame points to the outer end surface of the fixed template 8; the hopper seat 10 is arranged on the barrel assembly 33 and communicates with the inside of the barrel assembly 33; The material storage motor 17 is arranged on the material storage motor bracket 39, and the material storage motor bracket 39 is arranged on the injection moving plate 18, and the injection moving plate 18 is slidably arranged on the frame, and the frame is slidably matched with the body 27; the injection motor 35 is arranged on the injection On the motor bracket 38, the injection motor bracket 38 is arranged on the frame, and the injection motor 35 is connected with the transmission of the injection moving plate 18 to control the sliding of the injection moving plate 18 on the frame.

The pump mouth of described oil pump 31 comprises oil suction port and oil outlet, and oil suction port is communicated with oil tank 32, and oil outlet is connected with each oil cylinder (comprising mold shifting oil cylinder 2, clamping oil cylinder 3, ejection oil cylinder 4, pressurization) through control valve. Oil cylinder 34 is communicated with the hydraulic pipeline of shooting oil cylinder 9). The storage motor support 39 is fixedly arranged on the injection movable plate 18, and the distance between the center of the storage motor support 39 and the center of the injection movable plate 18 is adjustable.

The frame of the electric plasticizing injection device includes an injection head plate 11, a guide post 22 and an injection tail plate 23, the injection head plate 11 and the injection tail plate 23 are fixedly arranged at both ends of the guide post 22, the injection head plate 11 and the injection tail plate 23 is arranged on the linear guide rail 26, and the linear guide rail 26 is connected with the fuselage 27, and the injection moving plate 18 is arranged between the injection head plate 11 and the injection tail plate 23, and is slidably matched with the guide post 22. Both ends of the guide post 22 are provided with bolts, and the bolts at both ends respectively pass through the injection head plate 11 and the injection tail plate 23 to connect with the locking nut 24 .

The storage motor 17 is connected to the screw 12 through the storage deceleration transmission pair, the injection motor 35 is connected to the injection moving plate 18 through the injection deceleration transmission pair and the ball screw transmission pair 21 in turn, and the injection motor bracket 38 is arranged on the injection tail plate 23, the distance between the center of the injection motor bracket 38 and the center of the injection tail plate 23 is adjustable; between the ball screw transmission pair 21 and the injection moving plate 18, a transmission seat 19 and an injection force measuring plate 20 are also provided.

The reduction ratios of the storage deceleration transmission pair and the injection deceleration transmission pair are both 3:1.

Above-mentioned material storage deceleration transmission pair is made of material storage driving wheel 16, material storage transmission belt 15 and material storage driven wheel 14, and material storage driving wheel 16 is connected with the rotating shaft of material storage motor 17, and material storage driven wheel 14 is connected with transmission shaft 13, The screw rod 12 is connected with the transmission shaft 13, and the storage material transmission belt 15 transmits the power of the storage material driving wheel 16 to the storage material driven wheel 14 to drive the transmission shaft 13 to rotate, thereby driving the screw rod 12 to rotate.

The injection deceleration transmission pair is composed of an injection driving wheel 36, an injection transmission belt 37 and an injection driven wheel 25. The injection driving wheel 36 is connected to the rotating shaft of the injection motor 35, and the injection driven wheel 25 is connected to the ball screw transmission pair 21. The injection transmission belt 37 will The power of the injection driving wheel 36 is transmitted to the injection driven wheel 25 to drive the ball screw transmission pair 21 to run.

The mold clamping device is a four-cylinder full hydraulic structure, which includes four tie rods 6, each tie rod 6 is arranged in parallel and fixed on the four corners of the fixed template 8 and the rear support 1 through the four corners of the movable template 5.

The clamping oil cylinder 3 is provided with four, and the cylinder body of each clamping oil cylinder 3 is set on the outside of a pull rod 6 and fixed on the movable template 5, the piston of the clamping oil cylinder 3 is fixed on the pull rod 6, and the piston pushes the cylinder body The interior is divided into a front chamber and a rear chamber, which are connected by a cartridge valve, and the cartridge valve connects or disconnects the front chamber and the rear chamber during the process of mold opening and closing or high-pressure mold clamping.

The mold-moving oil cylinder 2 is provided with two, the mold-moving oil cylinder 2 is installed between the movable template 5 and the support 1, the mold-moving oil cylinder 2 is on the same level as the mold-locking oil cylinder 3, and the front cavity of the two mold-moving oil cylinders 2 They communicate with each other, and the back chambers of the two die-moving cylinders 2 communicate with each other.

Described ejection oil cylinder 4 is provided with one, and it is positioned on movable template 5 center.

The booster cylinder 34 provides high pressure for the four clamping cylinders 3 , and the booster cylinder 34 communicates with the oil pump 31 and the clamping cylinder 3 through the control valve oil circuit respectively.

The mold clamping device and the electric plasticizing injection device lie on the fuselage 27, and the servo energy-saving system 28, pressurized oil cylinder 34 and oil tank 32 are arranged in the fuselage 27, wherein the servo energy-saving system 28 is located in the electric plasticizing injection device below.

The shooting oil cylinder 9 can be replaced by a motor drive mechanism to adjust the displacement of the electric plasticizing injection device through the motor drive mechanism. However, due to the limited installation position, the motor drive mechanism is relatively complicated. In addition, due to the storage motor 17 and The injection motors 35 all adopt servo control with high precision, so it is sufficient to use the shooting cylinder 9 to control the overall movement of the electric plasticizing injection device in this embodiment.

The electro-hydraulic compound injection molding machine also includes a computer operation control and a start-stop button set on the appearance computer panel, and the machine is in a normal working state (not shown in the figure) through computer operation control.

The mold-moving cylinder 2 and the mold-locking cylinder 3 have relatively large strokes, and the strokes can be freely controlled according to demand. The stroke space of the ejector cylinder 4 is large, and the mold-locking cylinder 3 does not need energy supply during the mold opening and closing process.

Above-mentioned fixed formwork 8 and support 1 are tightly fixed on the fuselage 27, and four pull rods 6 and the sliding feet fixed on the lower end of the movable formwork 5 that slide on the guide rail of the fuselage 27 jointly support the movable formwork 5.

As shown in FIG. 4 , a control method for an electro-hydraulic compound injection molding machine is characterized in that:

The first step is to start the servo energy-saving system 28, and transmit the hydraulic kinetic energy to each actuator cylinder through the hydraulic pipeline (the pressure change of each actuator cylinder is shown in Figure 5), and under the action of the control valve, the two mold-moving cylinders 2 push The template 5 approaches the fixed template 8, and at the same time, the cartridge valve is opened, and the clamping cylinder 3 runs together with the movable template 5 under the condition that the oil in the front cavity and the rear cavity are complementary through the oil pipe, so that the fixed template 5 and the fixed template 8 The mold 7 is locked, and then the cartridge valve is closed to disconnect the passage of the front cavity and the rear cavity of the clamping cylinder 3. At this time, the high-pressure oil of the pressurized cylinder 34 enters the high-pressure cavity close to the movable platen 5 to realize the final locking of the mold 7. tight.

In the second step, when the mold 7 is locked, the movement of the electric plasticizing injection device is controlled by the shooting cylinder 9, so that the barrel assembly 33 is in close contact with the feed port of the mold 7.

The third step is to start the injection motor 35, and drive the injection moving plate 18 to move rapidly toward the fixed platen 8 through the ball screw transmission pair 21, thereby pushing the screw 12 on the injection moving plate 18 to move, and finally melt the plastic at the front end of the screw 12 at a certain speed. Speed injection into the locked mold 7; before that, the accumulator motor 17 transfers the rotation energy to the screw 12, so that the screw 12 rotates to achieve the melting and plasticization of the plastic, and at the same time the screw 12 retreats under the action of the molten material, and pushes the injection motor. The plate 18 retreats, and the injection force measurement plate 20 located between the injection movable plate 18 and the ball screw transmission pair 21 feeds back the pressure of the injection movable plate 18 and the ball screw transmission pair 21 to the control circuit, and then the injection motor 35 And storage motor 17 makes adjustments.

In the fourth step, after the molten material fills the cavity inside the mold 7, the injection motor 35 continues to provide a certain pressure to the screw 12 to ensure that the product in the cavity of the mold 7 is cooled and shrinks, and then filled, so as to obtain a full and qualified product.

In the fifth step, the mold-moving cylinder 2 is activated, the movable platen 5 leaves the fixed platen 8, and at the same time the cartridge valve is opened, and the clamping cylinder 3 runs together with the movable platen 5 under the condition that the oil in the front cavity and the rear cavity are complementary through the oil pipe, so that the fixed platen The mold 7 on the movable template 5 and the fixed template 8 is opened to a certain distance.

The sixth step is to start the ejection cylinder 4, and the ejection cylinder 4 drives its piston rod to push the ejector plate to move quickly towards the movable template 5, so that the ejector rod (not shown in the figure) fixed on the ejector plate passes through the movable template 5 and the mold The male or female mold of 7 ejects the product to separate it from the mold 7, and takes out the product, and then the thimble cylinder quickly drives the thimble rod back.

In the above steps, the servo energy-saving system 28 keeps running, repeats the above process under the control of the computer, and performs the next round of processing.

After the fourth step, when the product is cooled and shaped (the product is cooled and shaped by the cooling water of the mold 7), the shooting cylinder 9 pushes the electric plasticizing injection device away from the fixed platen 8 to separate the barrel assembly 33 from the feed port of the mold 7 (This action can be omitted, that is, keep the position of the plasticizing injection device).

In addition, because the storage motor 17 is independent from the servo energy-saving system 28, the molten glue can be plasticized at other times except for injection and pressure holding time.

Claims (8)

1. An electro-hydraulic composite injection molding machine, comprising a fuselage, a mold clamping device, a mold clamping drive system and a plasticizing injection device, the mold clamping device is provided with a bracket, a movable template and a fixed template in turn, and the bracket and the fixed template are arranged on On the fuselage, the bracket and the fixed template are connected by tie rods, the movable template is slidably set on the tie rod, and the surface of the movable template facing the bracket is provided with a mold-moving cylinder, a mold-locking cylinder and an ejecting cylinder; the plasticizing injection device is slidably set on the fuselage On the top, there is a shooting cylinder used to control the overall movement of the plasticizing injection device between the fixed platen and the injection head plate, which is characterized in that: The mold clamping drive system is a servo energy-saving system, which includes a servo motor, a servo driver and an oil pump, the servo motor and the servo driver are electrically connected, the servo motor is connected to the oil pump, and the pump port of the oil pump is connected to the oil tank and the hydraulic pipeline respectively. The oil pump provides hydraulic driving energy for the mold transfer cylinder, mold clamping cylinder, ejector cylinder, booster cylinder and shooting cylinder through the hydraulic pipeline, and the booster cylinder provides high pressure for the mold clamping cylinder; The plasticizing injection device is an electric plasticizing injection device, which includes a barrel assembly, a hopper seat, a frame, a screw, a material storage motor, an injection moving plate and an injection motor, and the barrel assembly is fixedly arranged at the outer end of the frame and points to a fixed The outer end surface of the formwork; the hopper seat is set on the barrel assembly and communicates with the inside of the barrel assembly; the screw is inserted into the barrel assembly and connected to the storage motor drive, the storage motor is set on the storage motor bracket, and the storage motor The bracket is set on the injection moving plate, the injection moving plate is slidingly set on the frame, and the frame is slidingly matched with the body; the injection motor is set on the injection motor bracket, the injection motor bracket is set on the frame, and the injection motor is connected with the injection moving plate. To control the sliding of the injection moving plate on the frame. 2. The electro-hydraulic compound injection molding machine according to claim 1, characterized in that: the pump port of the oil pump includes an oil suction port and an oil outlet, the oil suction port is connected to the fuel tank, and the oil outlet is connected to each oil cylinder through a control valve. The hydraulic pipeline connection; The storage motor bracket is fixedly arranged on the injection movable plate, and the distance between the center of the material storage motor support and the center of the injection movable plate is adjustable. 3. The electro-hydraulic compound injection molding machine according to claim 1, characterized in that: the frame of the electric plasticizing injection device includes an injection head plate, a guide post and an injection tail plate, and the injection head plate and the injection tail plate are fixed It is arranged at both ends of the guide post, the injection head plate and the injection tail plate are arranged on the linear guide rail, and the linear guide rail is connected with the fuselage, and the injection moving plate is arranged between the injection head plate and the injection tail plate, and is slidably matched with the guide post. 4. The electro-hydraulic compound injection molding machine according to claim 3, characterized in that: the storage motor is connected to the screw through the storage deceleration transmission pair, and the injection motor is sequentially passed through the injection deceleration transmission pair and the ball screw transmission pair It is connected with the injection moving plate drive, the injection motor bracket is set on the injection tail plate, and the distance between the center of the injection motor bracket and the center of the injection tail plate is adjustable; A transmission seat and an injection force measuring plate are also arranged between the ball screw transmission pair and the injection moving plate. 5. The electro-hydraulic composite injection molding machine according to claim 4, characterized in that: the reduction ratios of the storage deceleration transmission pair and the injection deceleration transmission pair are both 3:1. 6. The electro-hydraulic compound injection molding machine according to claim 2, characterized in that: the mold clamping device is a four-cylinder full-hydraulic structure, which includes four tie rods, each tie rod is arranged in parallel and passes through the movable platen respectively The four corners are fixed on the four corners of the fixed template and the rear bracket; There are four clamping oil cylinders, and the cylinder body of each clamping cylinder is respectively set on the outside of a pull rod and fixed on the movable template. The piston of the clamping cylinder is fixed on the pull rod, and the piston divides the cylinder body into a front cavity and a The rear cavity, the front cavity and the rear cavity are connected by a cartridge valve, and the cartridge valve connects or disconnects the front cavity and the rear cavity during the process of mold opening and closing or high-pressure mold clamping; There are two mold-moving cylinders. The mold-moving cylinders are installed between the movable template and the support. The mold-moving cylinders are on the same level as the clamping cylinders. The front cavities of the two mold-moving cylinders communicate with each other. The back chambers of the oil cylinders communicate with each other; The ejection cylinder is provided with one, which is located on the center of the movable template; The booster cylinder provides high pressure for the four clamping cylinders, and the booster cylinders communicate with the oil pump and the clamping cylinder respectively through the control valve oil circuit. 7. The electro-hydraulic compound injection molding machine according to claim 6, characterized in that: the mold clamping device and the electric plasticizing injection device are placed on the machine body, and the servo energy-saving system, pressurized oil cylinder and fuel tank are arranged on the In the fuselage, the servo energy-saving system is located under the electric plasticizing injection device. 8. The electro-hydraulic compound injection molding machine according to claim 1, characterized in that: the injection cylinder is replaced by a motor drive mechanism, so as to adjust the displacement of the electric plasticizing injection device through the motor drive mechanism.