A fully electric extrusion type conversion injection molding device

Abstract

The present invention provides a fully electric extrusion-injection conversion injection molding device, which relates to the technical field of pre-plasticizing injection molding devices. The device includes a pre-plasticizing unit and an injection glue unit. A rotary valve is installed between the material passing end of the pre-plasticizing unit and the material discharging end of the injection glue unit. The pre-plasticizing unit is unidirectionally communicated with the injection glue unit through the rotary valve. The pre-plasticizing unit and the injection glue unit can extrude separately or simultaneously through the rotary valve. The extrusion pressure of the pre-plasticizing unit is greater than that of the injection glue unit. The pre-plasticizing unit and the injection glue unit are electrically connected to a control unit. The outlet end of the rotary valve monitors the pressure through the control unit, and the rotary valve is electrically connected to the control unit. This application can automatically switch between high-pressure and low-pressure extrusion working modes. By switching the mode, a sufficient amount of plasticized material can be injected into the mold cavity, achieving high injection pressure, high injection speed and stable working performance. The working method is flexible, creating conditions for molding large products.

Description

Technical Field

[0001] The present invention relates to the technical field of pre-plastic injection molding devices, and more particularly to a fully electric extrusion-injection conversion injection molding device. Background Art

[0002] In the current existing pre-plastic injection molding technology, the pre-plastic storage and injection molding actions are carried out separately. That is, when starting the pre-plastic injection molding machine equipment, the plasticized melt in unit time flows through the single screw extrusion of the extruder into the check valve and then into the pre-plastic cylinder for storage. After storage, a certain injection volume of the melt stored in the pre-plastic cylinder is then pushed into the mold cavity by the plunger in the pre-plastic cylinder for injection molding. Therefore, when selecting the pre-plastic injection molding machine equipment, it is also necessary to refer to the injection capacity in the equipment parameters and whether the injection volume of the injection molded part is within the range of the equipment injection capacity in order to produce products with excellent performance. Moreover, as the size, volume, and mass of large plastic components are getting larger and larger, the traditional and standard injection machine specifications and volumes are also becoming huge. Therefore, the matching flexibility of the equipment in the production process is reduced, and the energy consumed is also very large. This investment greatly increases the production cost of the manufacturer, resulting in a high market price for large plastic products and a relatively high investment cost. The main technical bottleneck is that it is difficult to match large-sized products with the injection volume.

[0003] Therefore, there is an urgent need for a fully electric extrusion-injection conversion injection molding device that can automatically switch between high and low pressure extrusion working modes, inject a sufficient amount of plasticized material into the mold cavity through the conversion mode, achieve stable working performance, and have a flexible working method. Summary of the Invention

[0004] The purpose of the present invention is to provide a fully electric extrusion-injection conversion injection molding device that can automatically switch between high and low pressure extrusion working modes, inject a sufficient amount of plasticized material into the mold cavity through the conversion mode, achieve high injection pressure, high-speed injection, and stable working performance, and have a flexible working method, creating conditions for molding large products. The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A fully electric extrusion-injection conversion injection molding device provided by the present invention includes a pre-plastic unit and an injection unit. A switching valve is installed between the material passing end of the pre-plastic unit and the discharge end of the injection unit. The pre-plastic unit is in one-way communication with the injection unit through the switching valve. The pre-plastic unit and the injection unit can extrude separately or simultaneously through the switching valve. The extrusion pressure of the pre-plastic unit is greater than the extrusion pressure of the injection unit. The pre-plastic unit and the injection unit are electrically connected to a control unit. The outlet end of the switching valve monitors the pressure through the control unit, and the switching valve is electrically connected to the control unit.

[0007] Preferably, it further includes:

[0008] A discharge end head, the rotary valve is installed on the discharge end head, the material passing end of the plasticizing unit and the discharge end of the injection glue unit are respectively communicated with the inlet end of the discharge end head through the rotary valve, and the pressure monitoring end of the control unit is installed near the outlet end of the discharge end head.

[0009] Preferably, the plasticizing unit includes a storage cylinder, one end of the storage cylinder is fixedly communicated with the inlet end of the discharge end head, the injection glue unit is unidirectionally communicated with one end of the storage cylinder through the rotary valve, a screw rod pushing component is arranged in the storage cylinder, a first servo motor is arranged at the other end of the storage cylinder, the screw rod pushing component is in transmission connection through the first servo motor, and the screw rod pushing component and the first servo motor are respectively electrically connected with the control unit.

[0010] Preferably, the screw rod pushing component includes a screw rod slidably connected coaxially in the storage cylinder, a piston part coaxially connected to one end of the screw rod, and a load sensor installed at the connection part of the screw rod and the piston part. The piston part is fixedly connected with one end of the screw rod through the load sensor, the screw rod is in transmission connection with the first servo motor, a storage cavity is formed between the piston part and the rotary valve, the plasticizing unit is communicated with the storage cavity through the rotary valve, and the piston part and the load sensor are respectively electrically connected with the control unit.

[0011] Preferably, the piston part includes an electronic ruler, a piston rod and a piston. One end of the piston rod is fixedly connected with one end of the screw rod through the load sensor, the other end of the piston rod is fixedly connected coaxially with the piston, the piston is axially slidably connected to the inner wall of the storage cylinder, the storage cavity is located between the piston and the rotary valve, the electronic ruler is installed on the piston rod, and the electronic ruler is electrically connected with the control unit.

[0012] Preferably, the rotary valve includes a valve body fixedly connected in the discharge end head. Three groups of material ports and a material flow channel are arranged in the valve body. The three groups of material ports are communicated with the same material flow channel, and the three groups of material ports are respectively communicated with the discharge end of the injection glue unit, the storage cavity and the outlet end of the discharge end head. A valve core is rotatably connected in the material flow channel, a second servo motor is fixedly connected to the outer surface of the discharge end head, the valve core is driven by the output shaft of the second servo motor, any two groups of the material ports are communicated through the valve core or the three groups of the material ports are communicated through the valve core, and the second servo motor is electrically connected with the control unit.

[0013] Preferably, it further includes:

[0014] A ball screw drive assembly is coaxially connected to the storage cylinder for rotation, the ball screw drive assembly is threadedly sleeved on the outside of the screw, and the ball screw drive assembly is transmission-connected to the first servo motor.

[0015] Preferably, the injection glue unit includes an extruder, a screw is rotatably connected inside the extruder, one end of the extruder is connected to a group of the material ports, and the other end of the extruder is fixedly connected to another group of the first servo motors, and the output shaft of the first servo motor is drivingly connected to the screw.

[0016] Preferably, the control unit includes an industrial controller and a pressure sensor, the industrial controller is fixedly connected to the outside of the storage cylinder or the extruder, and the sensing end of the pressure sensor is installed in the outlet end of the discharge end.

[0017] In the technical solution provided by the present invention, the pressure at the outlet of the rotary valve is monitored, that is, the pressure in the mold cavity is monitored, so as to accurately identify the filling degree status in the mold cavity; when the pre-plastic unit is unidirectionally connected to the injection glue unit through the rotary valve, the injection glue unit injects plasticized material into the pre-plastic unit; the injection glue unit mainly functions to perform low-pressure and low-speed injection molding functions, and the pre-plastic unit is mainly for high-pressure and high-speed injection molding mode; the main function of the control unit is to control the flow state of the rotary valve according to the monitored pressure value, that is, to realize the injection glue unit to inject plasticized material into the pre-plastic unit in one direction or the injection glue unit is extruded into the mold cavity alone or the pre-plastic unit is extruded into the mold cavity alone or the injection glue unit and the pre-plastic unit are extruded into the mold cavity together; on the whole, the present application can automatically switch between high and low pressure extrusion working modes, and by switching the mode, a sufficient amount of plasticized material is injected into the mold cavity, so as to realize high injection pressure and high-speed injection and its stable working performance, and the working mode is flexible, creating conditions for molding large products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is an overall schematic diagram of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of the combined state of the valve body and the valve core of the present invention;

[0021] Figure 3 is a cross-sectional schematic diagram of the valve core of the present invention;

[0022] Figure 4 It is a schematic diagram of the three sets of material inlets and the material flow channels of the present invention;

[0023] Figure 5 It is a schematic diagram of different communication states of the valve core of the present invention.

[0024] In the figure, 1 - the first servo motor; 2 - the electronic scale; 3 - the extruder; 4 - the material storage cylinder; 5 - the rotary valve; 6 - the load sensor; 7 - the nozzle; 8 - the pressure sensor; 9 - the industrial controller; 10 - the piston rod; 11 - the ball screw pair drive assembly; 20 - the material flow channel; 21 - the valve core; 22 - the valve body; 23 - the second servo motor. Specific embodiments

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts fall within the scope protected by the present invention.

[0026] Reference Figures 1-5 , a specific embodiment of the present invention provides a fully electric extrusion-injection conversion injection molding device, including a plasticizing unit and an injection unit. A rotary valve 5 is installed between the material passing end of the plasticizing unit and the material discharging end of the injection unit. The plasticizing unit is in one-way communication with the injection unit through the rotary valve 5. The plasticizing unit and the injection unit can extrude separately or simultaneously through the rotary valve 5. The extrusion pressure of the plasticizing unit is greater than that of the injection unit. The plasticizing unit and the injection unit are electrically connected to a control unit. The outlet end of the rotary valve 5 monitors the pressure through the control unit, and the rotary valve 5 is electrically connected to the control unit.

[0027] Monitoring the pressure at the outlet end of the rotary valve 5 is to monitor the pressure in the mold cavity, which is convenient for accurately identifying the filling degree state in the mold cavity; when the plasticizing unit is in one-way communication with the injection unit through the rotary valve 5, the injection unit injects plasticized material into the plasticizing unit; the main function of the injection unit is to perform low-pressure and low-speed injection molding functions, and the main function of the plasticizing unit is for high-pressure and high-speed injection molding modes; the main function of the control unit is to control the flow state of the rotary valve 5 according to the monitored pressure value, that is, to realize the injection of plasticized material from the injection unit to the plasticizing unit in one direction, or the injection unit extrudes alone into the mold cavity, or the plasticizing unit extrudes alone into the mold cavity, or the injection unit and the plasticizing unit extrude together into the mold cavity; overall, the present application can automatically switch between high-pressure and low-pressure extrusion working modes, inject sufficient plasticized material into the mold cavity through the switching mode, achieve high injection pressure, high-speed injection and its stable working performance, with flexible working methods, creating conditions for molding large products.

[0028] For further optimized solutions, it further includes:

[0029] The rotary valve 5 is installed on the discharge end, the feed end of the pre-plastic unit and the discharge end of the injection unit are connected to the inlet end of the discharge end through the rotary valve 5, and the pressure monitoring end of the control unit is installed close to the outlet end of the discharge end.

[0030] The discharge end is equivalent to a three-way structure. The pre-plastic unit is connected to the injection glue unit through the rotary valve 5, the pre-plastic unit is connected to the mold cavity through the rotary valve 5, the injection glue unit is connected to the mold cavity through the rotary valve 5, and the pre-plastic unit and the injection glue unit are connected to the mold cavity at the same time through the rotary valve 5.

[0031] To further optimize the solution, the pre-plasticizing unit includes a storage cylinder 4, one end of which is fixedly connected to the inlet end of the discharge end, the injection glue unit is unidirectionally connected to one end of the storage cylinder 4 through a rotary valve 5, a screw pushing assembly is arranged in the storage cylinder 4, and a first servo motor 1 is arranged at the other end of the storage cylinder 4, the screw pushing assembly is connected through the first servo motor 1, and the screw pushing assembly and the first servo motor 1 are electrically connected to the control unit respectively.

[0032] To further optimize the solution, the screw pushing assembly includes a screw coaxially slidably connected in the storage cylinder 4, a piston part coaxially connected to one end of the screw, and a load sensor 6 installed at the connection between the screw and the piston part. The piston part is fixedly connected to one end of the screw through the load sensor, the screw is transmission-connected to the first servo motor 1, a storage chamber is formed between the piston part and the rotary valve 5, the pre-plasticizing unit is connected to the storage chamber through the rotary valve 5, and the piston part and the load sensor are electrically connected to the control unit respectively.

[0033] When the injection glue unit is required to inject plasticized material into the pre-plasticizing unit, the piston part is located in the storage chamber near the rotary valve 5, and there is not enough plasticized material in the storage chamber; the injection glue unit is connected with one end of the storage cylinder 4 through the rotary valve 5, and the control unit controls the start of the first servo motor 1, and the first servo motor 1 drives the screw pusher assembly to operate, that is, drives the screw and the piston part to operate, and the injected plasticized material gradually fills the storage chamber; when a high-pressure and high-speed injection molding mode is required, the control unit sends a control signal, the pre-plasticizing unit is connected with the mold cavity through the rotary valve 5, and the first servo motor 1 is driven in reverse to push the plasticized material into the mold cavity through the piston part.

[0034] A further optimized solution is that the piston part includes an electronic ruler 2, a piston rod 10 and a piston. One end of the piston rod 10 is fixedly connected to one end of the screw rod through a load sensor 6, and the other end of the piston rod 10 is fixedly connected to the piston coaxially. The piston is axially slidably connected to the inner wall of the storage cylinder 4, and the storage chamber is located between the piston and the rotary valve 5. The electronic ruler 2 is installed on the piston rod 10, and the electronic ruler 2 is electrically connected to the control unit.

[0035] When the piston is pushing the plasticized material into the mold cavity, the load sensor 6 obtains the pressure value transmitted to the piston rod 10, that is, the extrusion pressure and extrusion amount can be determined. After the pressure value of the load sensor 6 is tracked, compared and calculated with the parameters pre-set in the control unit, the control unit outputs a control signal to control the first servo motor 1 to ensure the accuracy of the piston rod 10's retreat speed during the control of the pre-plastic back pressure, which can improve the homogenization degree of the melt, reduce the temperature difference, and ensure the plasticization quality.

[0036] During the synchronous movement of the piston rod 10 and the piston, whether filling the plasticized material in the storage cylinder 4 or extruding the plasticized material, the stroke of the piston is monitored by the electronic ruler 2, and its monitoring value represents the change in the molten plasticized material in the storage cylinder 4. The piston drives the electronic ruler 2 to change its stroke position as it moves, and the detected position signal is transmitted to the control unit, and the pre-stored program position signal point and the aging position are set for precise feedback to control the pressure and speed of injection molding and pre-molding and end the pre-molding or injection process.

[0037] A further optimized solution is provided, wherein the rotary valve 5 comprises a valve body 22, which is fixedly connected in the discharge end head, and three groups of material ports and material flow channels 20 are provided in the valve body 22, and the three groups of material ports are connected with the same material flow channel 20, and the three groups of material ports are respectively connected with the discharge end of the injection glue unit, the material storage cavity, and the discharge end of the discharge end head, and a valve core 21 is rotatably connected in the material flow channel 20, and a second servo motor 23 is fixedly connected to the outer surface of the discharge end head, and the valve core 21 is driven by the output shaft of the second servo motor 23, and a T-shaped channel (not marked in the figure) is provided in the valve core 21, and any two groups of material ports are connected through the T-shaped channel or three groups of material ports are connected through the T-shaped channel, and the second servo motor 23 is electrically connected to the control unit.

[0038] The valve core 21 is driven to rotate by the second servo motor 23, so that the storage cylinder 4 is connected to the injection glue unit, the storage cylinder 4 is connected to the mold cavity, and the injection glue unit is connected to the mold cavity. The storage cylinder 4 and the injection glue unit are connected to the mold cavity at the same time through the rotary valve 5, which can realize multiple functional injection modes and solve the problem of small injection capacity of the quantitative storage cylinder on the injection equipment. Changing the operation mode can appropriately meet the injection volume requirements of large injection parts, creating conditions for injection molding of large products.

[0039] Further optimization plans also include:

[0040] The ball screw drive assembly 11 is coaxially connected to the storage cylinder 4 for rotation. The ball screw drive assembly 11 is threadedly sleeved on the outside of the screw. The ball screw drive assembly 11 is transmission-connected to the first servo motor 1 .

[0041] For a further optimized solution, the injection glue unit includes an extruder 3. A screw is rotatably connected inside the extruder 3. One end of the extruder 3 communicates with a set of material inlets, and the other end of the extruder 3 is fixedly connected to another set of first servo motors 1. The output shaft of the first servo motor 1 is in transmission connection with the screw.

[0042] For a further optimized solution, the control unit includes an industrial controller 9 and a pressure sensor 8. The industrial controller 9 is fixedly connected to the outside of the storage cylinder 4 or the extruder 3, and the sensing end of the pressure sensor 8 is installed inside the outlet end of the discharge end.

[0043] During the injection molding process, the pressure sensor 8 monitors the pressure of the molten plasticized material in the mold cavity (die cavity) in real time. According to the data signal detected in real time, it is transmitted to the industrial controller 9. After comparing and referring to the pre-set parameters, the industrial controller 9 then outputs a drive signal to control the speed, direction and torque of the servo motors with respective functions, so as to judge and select the injection molding operation mode. The pressure sensor 8 can ensure the weight and position repeatability accuracy of the injection molded product, thus ensuring the quality control accuracy during the injection process.

[0044] As described above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A fully electric extrusion type conversion injection molding device, characterized in that, It comprises a pre-plasticizing unit and an injection glue unit, a rotary valve (5) is installed between the feeding end of the pre-plasticizing unit and the discharging end of the injection glue unit, the pre-plasticizing unit is unidirectionally connected with the injection glue unit through the rotary valve (5), the pre-plasticizing unit and the injection glue unit are extruded separately or simultaneously through the rotary valve (5), the extrusion pressure of the pre-plasticizing unit is greater than the extrusion pressure of the injection glue unit, the pre-plasticizing unit and the injection glue unit are electrically connected to a control unit, the outlet end of the rotary valve (5) monitors the pressure through the control unit, and the rotary valve (5) is electrically connected to the control unit; It also includes: a discharge end, the rotary valve (5) is installed on the discharge end; The rotary valve (5) comprises a valve body (22), the valve body (22) being fixedly connected to the discharge end head, the valve body (22) being provided with three groups of material ports and a material flow channel (20), the three groups of material ports being connected to the same material flow channel (20), the three groups of material ports being connected to the discharge end of the injection unit, the material storage chamber, and the discharge end of the discharge end head, respectively, a valve core (21) being rotatably connected to the material flow channel (20), a second servo motor (23) being fixedly connected to the outer surface of the discharge end head, the valve core (21) being driven by the output shaft of the second servo motor (23), any two groups of material ports being connected to each other through the valve core (21) or any three groups of material ports being connected to each other through the valve core (21), and the second servo motor (23) being electrically connected to the control unit; The pre-plasticizing unit comprises a material storage cylinder (4), one end of the material storage cylinder (4) being fixedly connected to the inlet end of the discharge end; The invention also comprises: a ball screw drive assembly (11), the ball screw drive assembly (11) being coaxially rotatably connected to the material storage cylinder (4), the ball screw drive assembly (11) being threadedly sleeved on the outside of the screw, and the ball screw drive assembly (11) being drivingly connected to the first servo motor (1).

2. The all-electric extrusion injection conversion injection molding device according to claim 1, characterized in that, The feed end of the pre-plasticizing unit and the discharge end of the injection unit are respectively connected to the inlet end of the discharge end through the rotary valve (5), and the pressure monitoring end of the control unit is installed close to the outlet end of the discharge end.

3. The all-electric extrusion-injection conversion injection molding device according to claim 2, wherein: The injection glue unit is unidirectionally connected to one end of the storage cylinder (4) via the rotary valve (5); a screw push assembly is provided in the storage cylinder (4); a first servo motor (1) is provided at the other end of the storage cylinder (4); the screw push assembly is transmission-connected via the first servo motor (1); and the screw push assembly and the first servo motor (1) are electrically connected to the control unit respectively.

4. The all-electric injection-conversion injection molding device according to claim 3, characterized in that: The screw pusher assembly comprises a screw coaxially connected to the storage cylinder (4), a piston coaxially connected to one end of the screw, and a load sensor (6) installed at the connection between the screw and the piston; the piston is fixedly connected to one end of the screw via the load sensor; the screw is transmission-connected to the first servo motor (1); a storage chamber is formed between the piston and the rotary valve (5); the pre-plasticizing unit is connected to the storage chamber via the rotary valve (5); and the piston and the load sensor are electrically connected to the control unit, respectively.

5. The all-electric injection and extrusion conversion injection molding device according to claim 4, characterized in that: The piston part comprises an electronic ruler (2), a piston rod (10) and a piston; one end of the piston rod (10) is fixedly connected to one end of the screw rod via the load sensor (6); the other end of the piston rod (10) is fixedly connected to the piston coaxially; the piston is axially slidably connected to the inner wall of the material storage cylinder (4); the material storage chamber is located between the piston and the rotary valve (5); the electronic ruler (2) is mounted on the piston rod (10); and the electronic ruler (2) is electrically connected to the control unit.

6. The fully electric extrusion type conversion injection molding device according to claim 5, characterized in that: The injection glue unit comprises an extruder (3), a screw being rotatably connected inside the extruder (3), one end of the extruder (3) being communicated with a group of the material ports, and the other end of the extruder (3) being fixedly connected with another group of the first servo motors (1), the output shaft of the first servo motor (1) being drivingly connected with the screw.

7. The all-electric injection-conversion injection molding device according to claim 6, wherein: The control unit comprises an industrial controller (9) and a pressure sensor (8); the industrial controller (9) is fixedly connected to the outside of the storage cylinder (4) or the extruder (3); and the sensing end of the pressure sensor (8) is installed in the outlet end of the outlet end.

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