Drive system and injection molding machine

Abstract

The present invention discloses a drive system and an injection molding machine, relating to the technical field of injection molding. Among them, the drive system includes a drive signal module, a power module, at least two control switches, and at least two drive motors. The drive signal module is used to output a time-sharing control signal; the power module is used to provide power; the receiving end of the control switch is connected to the output end of the power module, and the control end of the control switch is connected to the drive signal module; the output end of the control switch is connected to the drive motors one by one; the control switch is used to turn on and off according to the time-sharing control signal. The drive system can utilize the characteristics of different components of corresponding equipment such as an injection molding machine running in a time-sharing manner, and can turn on and off different control switches through the time-sharing control signal output by the drive signal module, provide drive power for the drive motors corresponding to different components to make them run, reduce the number of drive modules, and is beneficial to reducing the overall equipment cost.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to a drive system and an injection molding machine. Background Art

[0002] With the development of the economy, enterprises have higher and higher requirements for production and products. The disadvantages of hydraulic injection molding machines have become more and more obvious, and hydraulic injection molding machines in specific industries can no longer meet the requirements of production and products. For example, in industries such as medicine, food, and electronics, the advantages of all-electric injection molding machines are very obvious and the trend of industry full electrification is getting stronger.

[0003] After the injection molding machine system is fully electrified, the electrification benefits that the system can exert are also very obvious. For different components of the core mechanism (material storage, injection, mold opening and closing, ejection), servo motors, synchronous belts and wheels, and lead screws are very maturely applied. After the full electrification development of injection molding machines, the overall machine cost remains high, and reducing costs is the key to promoting the rapid increase of the full electrification rate of injection molding machines. Summary of the Invention

[0004] The main object of the present invention is to propose a drive system, aiming to reduce the overall equipment cost.

[0005] To achieve the above object, the drive system for an injection molding machine proposed by the present invention includes a drive signal module, a power module, at least two control switches, and at least two drive motors. The drive signal module is used to output a time-sharing control signal; the power module is used to provide power to the injection molding machine; the receiving end of the control switch is connected to the output end of the power module, and the control end of the control switch is connected to the drive signal module; the output end of the control switch is connected to the drive motor in one-to-one correspondence; the control switch is used to turn on and off according to the time-sharing control signal to output drive power to the drive motor.

[0006] Optionally, the drive system includes a connection module. The connection module includes at least two power lines, and the output end of the control switch is correspondingly connected to the drive motor through the power line.

[0007] Optionally, the connection module further includes a signal interface and at least two signal lines. The signal lines are correspondingly connected to the control end of the control switch. The signal lines are all connected to the signal interface, and the signal interface is detachably connected to the drive signal module; the connection module further includes at least two drive isolation modules, and the drive isolation modules are correspondingly arranged on the signal lines.

[0008] Optionally, the connection module further includes a power input interface. The input ends of the power lines are all connected to the power input interface, and the power input interface is detachably connected to the power module. The connection module further includes at least two power output interfaces, which are correspondingly connected to the output ends of the power lines, and the power output interfaces are used for detachably connecting to the drive motors.

[0009] Optionally, the connection module includes three of the power lines, the drive system includes three drive motors, and the three drive motors are respectively set as an ejection motor, a mold adjustment motor, and a shot transfer motor. The ejection motor is used to eject the product formed by injection molding. The output shaft of the mold adjustment motor is used for driving connection with the moving platen, and the output shaft of the shot transfer motor is used for connection with the injection unit assembly. The shot transfer motor is used to move the injection port of the injection unit assembly to the mold injection port.

[0010] Optionally, an encoder is provided on each of the ejection motor, the mold adjustment motor, and the shot transfer motor.

[0011] Optionally, at most one of the control switches is in a conducting state.

[0012] The present invention also provides an injection molding machine, which includes the above-mentioned drive system.

[0013] The present invention also provides an injection molding machine, which includes the above-mentioned drive system; the injection molding machine further includes an injection unit assembly and a mold base assembly. The injection unit assembly includes a screw, a barrel, and an injection driving device. The screw is sleeved in the barrel, and an injection port is provided at one end of the barrel. The injection driving device is connected to the end of the screw away from the injection port, and the injection driving device is used to axially move the screw; the mold base assembly includes a fixed platen and a moving platen, the fixed platen and the moving platen are arranged oppositely, and a mold injection port is provided on the fixed platen.

[0014] Optionally, the injection molding machine further includes a judgment device. The signal receiving end of the judgment device is electrically connected to the encoder on the shot transfer motor, and the signal output end of the judgment device is electrically connected to the control end of the shot transfer motor; when the moving distance of the shot transfer motor increases to a preset value, the output speed of the shot transfer motor decreases; and / or the injection molding machine further includes a detection device, which is used to detect whether the moving platen moves to a preset position. The signal output end of the detection device is electrically connected to the control end of the mold adjustment motor; when the moving platen moves to the preset position, the output speed of the mold adjustment motor decreases.

[0015] The technical solution of the present invention sets the drive system to include a drive signal module, a power module, at least two control switches, and at least two drive motors. The drive signal module is used to output a time-sharing control signal; the power module is used to provide power to the injection molding machine; the receiving end of the control switch is connected to the output end of the power module, and the control end of the control switch is connected to the drive signal module; the output end of the control switch is connected to the drive motor in one-to-one correspondence; the control switch is used to turn on and off according to the time-sharing control signal to output drive power to the drive motor. At this time, the drive system can utilize the characteristics of different components of corresponding equipment such as injection molding machines running in a time-sharing manner, and can turn on and off different control switches through the time-sharing control signal output by the drive signal module to provide drive power for the drive motors corresponding to different components and make them run, reducing the number of drive modules and being beneficial to reducing the overall equipment cost. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the drive system of the present invention.

[0018] Figure 2 It is a schematic structural diagram of an embodiment of the injection molding machine of the present invention.

[0019] Figure 3 It is a schematic step diagram of an embodiment of the drive system of the present invention during operation.

[0020] Explanation of the reference numerals in the drawings:

[0021]

[0022] The realization of the object of the present invention, functional features, and advantages will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0026] The present invention provides a drive system for an injection molding machine, and the drive system can be used for an injection molding machine.

[0027] Referring to Figure 1 , the drive system for the injection molding machine includes a drive signal module 200, a power module 300, at least two control switches, and at least two drive motors. The control switches can be set as relay switches. For example, it can be set to include three control switches K1, K2, and K3 referring to Figure 1 . The power module 300 can be set as a conversion power board for AC-to-DC and then to AC conversion. The drive signal module 200 is used to output a time-sharing control signal; the power module 300 is used to provide power to the injection molding machine; the receiving end of the control switch is connected to the output end of the power module 300, and the control end of the control switch is connected to the drive signal module 200; the output end of the control switch is used to be correspondingly connected to the drive motors one by one; the control switch is used to turn on and off according to the time-sharing control signal to output drive power to the drive motors.

[0028] At this time, the drive system can utilize the characteristics of different components of corresponding equipment such as an injection molding machine running in a time-sharing manner, and can turn on and off different control switches through the time-sharing control signal output by the drive signal module 200, provide drive power for the drive motors corresponding to different components to make them run, reduce the number of drive modules, and is beneficial to reducing the overall equipment cost.

[0029] Further as an optional implementation manner, referring to Figure 1The drive system includes a connection module 100, and the connection module 100 has at least two power lines 110, as can be seen from Figure 1 It is configured to include three power circuits 110. At this time, the three control switches K1, K2, and K3 are correspondingly arranged on the three power circuits 110, that is, the receiving end and the output end of the control switch are respectively connected to the input end and the output end of the power circuit 110, or one of the receiving end and the output end of the control switch is connected to the power circuit 110, and the other is connected to other components. The output end of the control switch is correspondingly connected to the drive motor through the power circuit 110. Specifically, it can be configured that the power circuit 110 and the drive motor are connected one by one, and the output end of the power circuit 110 is detachably connected to the drive motor to output drive power to the drive motor. At this time, the connection module 100 is convenient for disassembly and assembly with the drive motor, and is convenient for replacement when damaged. The output end of the power circuit 110 can be configured to connect the drive motors of different components of the injection molding machine to output drive power to the corresponding drive motor. The drive motor can be configured as the ejection motor M1, the mold adjustment motor M2, and the injection shift motor M3 described below.

[0030] As an optional embodiment, the connection module 100 further includes a signal interface J10 and at least two signal lines 120. If it is configured to include three signal lines 120, the three signal lines 120 are correspondingly connected to the control ends of the three control switches K1, K2, and K3, and the signal lines 120 are all connected to the signal interface J10. The signal interface J10 is detachably connected to the drive signal module 200, so that the connection module 100 is more convenient to disassemble and assemble with the drive signal module 200, and is convenient to replace when damaged, thereby reducing maintenance costs; the connection module 100 also includes at least two drive isolation modules G1, which are correspondingly arranged on the signal line 120, that is, the input end and the output end of the drive isolation module G1 are connected to a part of the signal line 120 or directly connected to other components (such as the signal interface J10). The drive isolation module G1 can be configured as a drive isolation circuit to ensure that the strong current of the power line 110 and the weak signal of the signal line 120 are isolated, thereby avoiding damage to the signal generating device.

[0031] As an optional implementation, the control ends of the three control switches K1, K2, and K3 are all connected to the signal interface J10 to open and close different control switches K1, K2, or K3 according to different drive signals. At this time, the connection module 100 can utilize the time-sharing operation characteristics of different components of the corresponding equipment, such as mold opening and closing, injection, ejection, mold adjustment, and shot shifting in an injection molding machine.

[0032] At this time, the connection module 100 can access different drive signals of a single drive signal module through the signal interface J10 to open and close different control switches, making different power lines 110 conductive, providing drive power for the corresponding drive motors to make them operate, reducing the number of drive signal modules, and being beneficial to reducing the overall equipment cost. In addition, the connection module 100 is convenient for disassembly and repair, which is beneficial to reducing the manufacturing and repair costs.

[0033] Further as an optional implementation manner, the connection module 100 further includes a power input interface J20. The input ends of the power lines 110 are all connected to the power input interface J20, and the power input interface J20 is detachably connected to the power module 300, so that the connection module 100 is further convenient for disassembly and repair, and is more beneficial to reducing the manufacturing and repair costs; the connection module 100 further includes at least two power output interfaces, such as being set to include three power output interfaces J31, J32, and J33. The power output interfaces J31, J32, and J33 are correspondingly connected to the output ends of the power lines 110, and the power output interfaces J31, J32, and J33 are used for detachably connecting to the drive motors, such as the ejection motor M1, the die adjustment motor M2, and the injection and transfer motor M3 described below. Thus, the output ends of the power lines 110 and the drive motors are correspondingly detachably connected in the form of the same interface.

[0034] Further as an optional implementation manner, the connection module 100 includes three power lines 110, and the drive system includes three drive motors, which are respectively set as the ejection motor M1, the die adjustment motor M2, and the injection and transfer motor M3. Refer to Figure 2 , the ejection motor M1 is used to eject the injection-molded product, and the output shaft of the die adjustment motor M2 is used for driving connection with the moving platen 411 (such as being connected through a hinge structure, a connecting rod structure, etc.), so that the moving platen 411 moves (refer to Figure 2 the direction indicated by the double arrow in, and moves under the guidance of the tie bars). The output shaft of the injection and transfer motor M3 is used for connecting with the injection unit assembly 420; for example, the injection unit assembly 420 is arranged on the guide rail, and the injection and transfer motor M3 makes the injection unit assembly 420 move on the guide rail, so that the injection and transfer motor M3 can be used to move the injection outlet 421 of the injection unit assembly 420 to the mold injection port 413, and the moving direction refers to Figure 2 the dotted line in. It should be noted that the injection unit assembly 420 can be set to include components such as an injection driving device, a feeding device, a screw, a material storage assembly, a barrel, a channel for providing additional material, and a nozzle protective cover for preventing injection leakage from splashing onto the operator. This embodiment does not limit this.

[0035] The control accuracy of the component position of some drive systems is low because the entire drive system is open-loop control. As a further optional implementation, encoders are provided on the ejector motor M1, the mold adjustment motor M2, and the shooting shift motor M3. At this time, the drive system can obtain the positions of the ejector motor M1, the mold adjustment motor M2 and the corresponding movable mold plate, the shooting shift motor M3 and the corresponding shooting platform assembly 420 through the encoder, and realize closed-loop control through the encoder, which is beneficial to improve the control accuracy of components such as the movable mold plate and the shooting platform assembly 420. As a further implementation, the encoders on the ejector motor M1, the mold adjustment motor M2, and the shooting shift motor M3 are all set to 23 bits or more, so as to achieve the control accuracy of the component position at the level of ±0.01mm, further improving the control accuracy of the components.

[0036] Reference Figure 2 The present invention also proposes an injection molding machine, which includes the above-mentioned drive system, and the injection molding machine also includes the above-mentioned shooting platform assembly 420 and the mold base assembly. Referring to the above, the shooting platform assembly 420 includes a screw, a barrel and an injection drive device. The screw is sleeved in the barrel, and one end of the barrel is provided with the above-mentioned ejection port 421. The injection drive device is connected to the end of the screw away from the ejection port 421, and the injection drive device is used to move the screw axially; the injection drive device can be set as a hydraulic motor, a linear motor, etc., and this embodiment does not limit this. The mold base assembly includes a fixed mold plate 412 and the above-mentioned movable mold plate 411. The fixed mold plate 412 is arranged opposite to the movable mold plate 411, and the fixed mold plate 412 is provided with the above-mentioned mold injection port 413. When the injection molding machine is running, the movable platen 411 is connected to the output shaft of the mold adjustment motor M2 through the movable platen 411, so that the movable platen 411 moves until the movable mold part of the mold on the movable platen 411 and the fixed mold part on the fixed platen 412 are closed; at this time, the shooting platform assembly 420 is connected to the output shaft of the shooting motor M3, and the shooting motor M3 moves the shooting port 421 of the shooting platform assembly 420 to the mold injection port 413; then, the injection drive device is used to move the screw axially to eject the fluid material from the shooting port 421; the fluid material passes through the mold injection port 413 and enters the mold until all injection molding is completed.

[0037] As a further optional embodiment, the injection molding machine further includes a judgment device. The signal receiving end of the judgment device is electrically connected to the encoder on the injection and transfer motor M3, and the signal output end of the judgment device is electrically connected to the control end of the injection and transfer motor M3. When the moving distance of the injection and transfer motor M3 increases to a preset value, the output speed of the injection and transfer motor M3 decreases. The judgment device can be set as a judgment circuit, and this judgment circuit judges the signal of the encoder on the injection and transfer motor M3 and the signal representing the preset value. At this time, the injection table assembly 420 can decelerate through the injection and transfer motor M3 when approaching the mold injection port 413 (manifested as the distance feedback by the corresponding encoder increasing to the preset value), avoiding direct collision with the mold injection port 413, reducing the risk of wear and glue leakage at the injection outlet 421, and reducing component loss.

[0038] As a further optional embodiment, the injection molding machine further includes a detection device for detecting whether the moving template 411 moves to a preset position. The signal output end of the detection device is electrically connected to the control end of the mold adjustment motor M2. When the moving template 411 moves to the preset position, the output speed of the mold adjustment motor M2 decreases. The detection device can be set as a travel switch, an infrared detection device, an ultrasonic rangefinder, etc. At this time, reducing the output speed of the mold adjustment motor M2 is beneficial to avoiding direct collision between the moving template 411 (or the mold thereon) and the fixed template 412 (or the mold thereon), and is beneficial to improving the service life of the injection molding machine.

[0039] Since this injection molding machine adopts all the technical solutions of all the above embodiments of the drive system, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0040] Refer to Figure 3 , the above drive system can operate according to the following drive method: Step S100, output a time-sharing drive signal to make different control switches turn on and off in sequence to turn on and off the power provided by the power module 300. Step S210, when the distance between the injection outlet 421 of the injection table assembly 420 and the mold injection port 413 is less than a first preset distance, reduce the output speed of the injection and transfer motor M3. Step S220, when the distance between the moving template 411 and the fixed template 412 is less than a second preset distance, reduce the output speed and / or increase the output torque of the mold adjustment motor M2.

[0041] In addition, after the step of outputting the time-sharing drive signal, make the power module 300 provide drive power, that is, first close the control switch and then provide drive power to the drive motor for cold power-on, which is beneficial to reducing current sparks.

[0042] The above drive system can be used on the above injection molding machine. Specifically, refer to Figure 1, the drive signal module 200 can output time-sharing drive signals through three channels A0, A1, and A2. For example, when the channels A0, A1, and A2 of the time-sharing drive signal output 1, 0, and 0 respectively, the control switch K1 is closed, and the control switches K2 and K3 are opened, and the ejector motor M1 can be powered on; when the channels A0, A1, and A2 of the time-sharing drive signal output 0, 1, and 0 respectively, the control switch K2 is closed, and the control switches K1 and K3 are opened, and the mold adjustment motor M2 can be powered on; when the channels A0, A1, and A2 of the time-sharing drive signal output 0, 0, and 1 respectively, the control switch K3 is closed, and the control switches K1 and K2 are opened, and the injection transfer motor M3 can be powered on. That is, the signal interface J10 in the connection module 100 accesses the channels of the time-sharing drive signal of a single drive signal module 200 (the different channels of A0, A1, and A2 do not output the "1" signal at the same time) to open and close different control switches K1, K2, and K3, so that different power lines 110 are conducted, providing drive power for the corresponding drive motors (ejector motor M1, mold adjustment motor M2, injection transfer motor M3) to make them operate, reducing the number of drive signal modules 200, which is beneficial to reducing the overall equipment cost. That is, by only making one of the channels A0, A1, and A2 conduct, the time-sharing operation of different components on the injection molding machine is realized through the time-sharing operation of the ejector motor M1, the mold adjustment motor M2, and the injection transfer motor M3. That is, in the above drive system, at most one control switch is in the on state to ensure the time-sharing operation of different components of the corresponding equipment such as the injection molding machine, that is, to avoid different components running at the same time. Of course, it is also possible to set the power module 300 to include at least two sub-modules, and the sub-modules are connected to the control switches one by one; by making at most one sub-module provide power, to ensure the time-sharing operation of different components of the corresponding equipment such as the injection molding machine, and this embodiment does not limit this.

[0043] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A drive system for an injection molding machine, characterized in that, The drive system includes: a drive signal module for outputting a time-sharing control signal; a power module for providing power to the injection molding machine; at least two control switches, the receiving end of the control switch is connected to the output end of the power module, and the control end of the control switch is connected to the drive signal module; at least two drive motors, the output end of the control switch is connected to the drive motor in one-to-one correspondence; the control switch is used to turn on and off according to the time-sharing control signal to output drive power to the drive motor; The drive system includes a connection module, and the connection module includes at least two power lines, and the output end of the control switch is connected to the drive motor correspondingly through the power line.

2. The drive system according to claim 1, characterized in that The connection module further includes a signal interface and at least two signal lines, the signal lines are connected to the control ends of the control switches correspondingly, the signal lines are all connected to the signal interface, and the signal interface is detachably connected to the drive signal module; the connection module further includes at least two drive isolation modules, and the drive isolation modules are correspondingly arranged on the signal lines.

3. The drive system according to claim 1, wherein The connection module further includes a power input interface, the input ends of the power lines are all connected to the power input interface, the power input interface is detachably connected to the power module; the connection module further includes at least two power output interfaces, the power output interfaces are connected to the output ends of the power lines correspondingly, and the power output interfaces are used for detachably connecting to the drive motor.

4. The drive system according to claim 1, characterized in that, The connection module includes three of the power lines, the drive system includes three of the drive motors, the three drive motors are respectively set as an ejection motor, a die adjustment motor, and a shot movement motor, the ejection motor is used to eject the injection molded product, the output shaft of the die adjustment motor is used for driving connection with the moving template, the output shaft of the shot movement motor is used for connection with the shot unit assembly, and the shot movement motor is used to move the shot outlet of the shot unit assembly to the mold injection port.

5. The drive system according to claim 4, characterized in that Encoders are provided on the ejection motor, the die adjustment motor, and the shot movement motor.

6. The drive system according to any one of claims 1 to 2, characterized in that, At most one of the control switches is in the on state.

7. An injection molding machine, characterized in that, The injection molding machine includes the drive system according to any one of claims 1 to 6.

8. An injection molding machine, characterized in that, The injection molding machine includes the drive system according to claim 4 or 5; the injection molding machine further includes a shot unit assembly and a mold base assembly, the shot unit assembly includes a screw, a barrel, and an injection drive device, the screw is sleeved in the barrel, a shot outlet is provided at one end of the barrel, the injection drive device is connected to the end of the screw away from the shot outlet, and the injection drive device is used to axially move the screw; the mold base assembly includes a fixed template and a moving template, the fixed template and the moving template are arranged oppositely, and a mold injection port is provided on the fixed template.

9. The injection molding machine according to claim 8, wherein, The injection molding machine further includes a judgment device, the signal receiving end of the judgment device is electrically connected to the encoder on the shot movement motor, and the signal output end of the judgment device is electrically connected to the control end of the shot movement motor; When the moving distance of the injection shifting motor increases to a preset value, the output speed of the injection shifting motor decreases; and / or the injection molding machine further includes a detection device for detecting whether the moving template moves to a preset position, and a signal output end of the detection device is electrically connected to a control end of the mold adjustment motor; when the moving template moves to the preset position, the output speed of the mold adjustment motor decreases.

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