Energy-saving plastic product injection molding production device

Abstract

The application relates to the technical field of injection machines, and discloses an energy-saving plastic product injection molding production device, which comprises a bearing rack, a feeding pipe is arranged on the bearing rack, a conveying screw is rotationally arranged in the feeding pipe, and a heating assembly is fixed to the outer side of the feeding pipe; a variable-speed assembly is arranged and comprises a first rotating wheel group, a second rotating wheel group and a transmission belt; the first rotating wheel group is in transmission connection with the conveying screw and is in transmission connection with the second rotating wheel group through the transmission belt. The first rotating wheel group is provided with a plurality of radial telescopic rods through a driving assembly, the problem that a conventional injection machine in the prior art cannot respond to material temperature changes in real time is solved, the conveying screw speed is adaptively and smoothly adjusted according to the material thermal state, and the injection speed of the material can be synchronously adjusted according to different injection temperatures of different materials.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an energy-saving injection molding production device for plastic products. Background Technology

[0002] With the continuous development of injection molding technology, the production and processing system of plastic products has become increasingly complex, and the application of various traditional injection molding machines and their drive components has increased accordingly. The daily tasks of material heating and injection molding have also become increasingly heavy.

[0003] Traditional injection molding machines and their drive components are typically used to inject molten plastic into molds for molding. During the machine startup and material heating and plasticizing stages, the thermal state of the material needs to be tracked and matched in real time to ensure that the material is fully plasticized and injected smoothly. During this process, operators need to rely on experience to manually adjust the motor speed or change pulleys of different diameters to change the injection speed. If the machine cannot respond to changes in material temperature in real time, forcibly injecting quickly at low temperatures can lead to product defects or even complete scrapping. After the work is completed, operators need to manually adjust the machine again or stop the machine to replace components as the temperature changes. Repeated manual intervention and adjustment are time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an energy-saving plastic product injection molding production device, which solves the technical problems of traditional injection molding machines being unable to respond in real time to changes in material temperature, resulting in product scrap due to forced rapid injection at low temperatures or energy waste due to low-temperature and low-speed injection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving plastic product injection molding production apparatus, comprising a support frame, a feeding pipe mounted on the support frame, a conveying screw rotatably mounted inside the feeding pipe, and a heating component fixed to the outside of the feeding pipe; a speed-changing component, comprising a first rotating wheel group, a second rotating wheel group, and a transmission belt, wherein the first rotating wheel group is drivenly connected to the conveying screw and is also drivenly connected to the second rotating wheel group via the transmission belt, the first rotating wheel group comprising a plurality of radially telescopic rods slidably distributed and a drive component; and wherein, when the drive component generates power based on the heat change of the heating component, it drives the plurality of radially telescopic rods to slide synchronously, thereby changing the radial circumference of the first rotating wheel group and adjusting the rotation speed.

[0006] Preferably, the first rotating wheel assembly further includes a fixed base plate fixed to the conveying screw, a plurality of radial telescopic rods slidingly disposed on the fixed base plate, an adjusting turntable rotatably disposed on the fixed base plate, a plurality of guide grooves being provided on the adjusting turntable, and a driving slider fixedly disposed in the corresponding guide groove on each radial telescopic rod.

[0007] Preferably, the drive assembly includes an actuator, a bearing disc fixed to the conveying screw, a guide slide fixed to the bearing disc, and a medium storage box disposed on one side of the guide slide, the medium storage box containing a medium.

[0008] Preferably, the actuator includes a push-pull piston slidably disposed in the guide cylinder and a lifting push rod connected to the push-pull piston, and a force-bearing inclined block is fixed on the adjusting turntable.

[0009] Preferably, a flow equalization damping plate is fixed inside the medium storage box, and multiple flow passages are opened on the flow equalization damping plate, with elastic deformable balls fixed in each flow passage.

[0010] Preferably, a tensioning and pressing wheel is slidably mounted on the support frame, and the tensioning and pressing wheel abuts against one side of the transmission belt.

[0011] Preferably, the drive assembly further includes an extended protective cylinder disposed on the guide slide, the lifting push rod movably passes through the extended protective cylinder, the push-pull piston includes an upper piston plate and a lower piston plate fixed on the lifting push rod, and an elastic support member disposed between the upper piston plate and the lower piston plate, and a pressure relief hole is provided on the lifting push rod.

[0012] Preferably, a transparent rotating ring is provided on the outer circumference of the bearing disc. When the pressure inside the guide slide is greater than a preset value, the lower piston plate compresses the elastic support and fits against the upper piston plate, thus exposing the pressure relief hole.

[0013] Preferably, an elastic torsion member is fitted onto the adjusting turntable, and the elastic torsion member applies a reset torque to the adjusting turntable.

[0014] Preferably, the support frame is equipped with a mold, the feed pipe is located at the injection port of the mold, and the feed pipe is connected to the feed hopper.

[0015] This invention provides an energy-saving injection molding production apparatus for plastic products. It has the following beneficial effects:

[0016] 1. This invention solves the problem in existing injection molding machines where the inability to respond in real time to material temperature changes leads to product scrap due to forced rapid injection at low temperatures or energy waste due to low-temperature, low-speed injection. By driving the radial telescopic rods to slide synchronously and change the radial circumference and rotation speed of the first rotating wheel group, the invention achieves adaptive and smooth adjustment of the conveyor screw speed according to the material temperature. It can synchronously adjust the injection speed of the material according to different injection temperatures, thus saving material.

[0017] 2. The present invention uses a medium storage box with a flow equalization damping plate and multiple flow holes to create flow resistance and delay the movement of the medium when it flows into or out of the guide slide. This effectively avoids the problem of frequent reciprocating motion of the push-pull piston and meaningless fluctuations in screw speed caused by sudden changes in the injection molding workshop environment. It greatly improves the stability of the conveying screw speed and reduces the wear of the transmission belt.

[0018] 3. This invention uses an upper piston plate, a lower piston plate, and an elastic support member, and sets pressure relief holes and drainage channels on the lifting push rod. When the internal components are stuck and the pressure inside the guide slide exceeds the preset safety threshold, the lower piston plate compresses the elastic support member to expose the pressure relief hole and allow the medium to flow out. This effectively avoids the problem of internal locking and equipment damage caused by the continuous expansion of the medium. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the transmission component structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the first rotating wheel assembly structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the fixed base plate and adjusting turntable structure of the present invention;

[0023] Figure 5 This is a partial cross-sectional schematic diagram of the drive component of the present invention;

[0024] Figure 6 This is a schematic cross-sectional view of the internal structure of the media storage box of the present invention;

[0025] Figure 7 This is a partial cross-sectional view of the push-pull piston of the present invention;

[0026] Figure 8 This is a schematic diagram of the transparent rotating ring position structure of the present invention.

[0027] Among them, 100 is the bearing frame; 110 is the mold; 200 is the feeding pipe; 210 is the heating component; 220 is the feeding hopper; 300 is the conveying screw; 400 is the speed change component; 410 is the transmission belt; 420 is the first rotating wheel assembly; 421 is the radial telescopic rod; 422 is the fixed base plate; 423 is the adjusting turntable; 424 is the guide groove; 424a is the driving slider; 425 is the force-bearing inclined block; 426 is the elastic torsion member; and 430 is the second rotating wheel assembly. 431. Transparent rotating ring; 500. Drive assembly; 510. Actuator; 511. Push-pull piston; 511a. Upper piston plate; 511b. Lower piston plate; 512. Lifting push rod; 512a. Pressure relief hole; 512c. Drainage channel; 520. Bearing disc; 530. Guide slide; 531. Extension protection cylinder; 540. Medium storage box; 541. Flow equalization damping plate; 541a. Flow hole; 542. Elastic deformation ball; 700. Tensioning extrusion wheel. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1, please refer to the appendix. Figure 1 - Appendix Figure 2 This is the first embodiment of the present invention. This embodiment provides an energy-saving plastic product injection molding production device, including a support frame 100 as the support structure of the entire device, used to fix and support other functional components. A feed pipe 200 is fixedly installed on the support frame 100, and a molten material conveying channel extending along the axial direction is formed inside it. A conveying screw 300 is arranged along the axial direction of the feed pipe 200 and is rotatably arranged in the internal cavity of the feed pipe 200 around its own axis. A heating component 210 is fixed on the outer wall of the feed pipe 200 in a wrapping or surrounding manner, used to heat and plasticize the material in the feed pipe 200.

[0030] The input shaft of the second rotating wheel set 430 of the transmission assembly 400 is connected to the output shaft of the drive motor, and the first rotating wheel set 420 is connected to the end of the conveying screw 300, which is responsible for driving the conveying screw 300 to rotate. The transmission belt 410 is simultaneously sleeved on the outer circumferential surface of the first rotating wheel set 420 and the second rotating wheel set 430 to form a transmission, transmitting the power output by the drive motor from the second rotating wheel set 430 to the first rotating wheel set 420.

[0031] Please see the appendix Figure 1 - Appendix Figure 2 The first rotating wheel assembly 420 includes multiple radial telescopic rods 421 that slide along its radial direction and a drive assembly 500. The drive assembly 500 is positioned near the heating assembly 210 and is used to sense the heat changes generated when the heating assembly 210 is working. The drive assembly 500 can directly convert the sensed heat changes into displacement force, and use this displacement force to drive the multiple radial telescopic rods 421 to extend outward or retract inward synchronously in the radial direction of the first rotating wheel assembly 420. The synchronous extension and retraction of the radial telescopic rods 421 directly changes the radius of contact between the first rotating wheel assembly 420 and the transmission belt 410, that is, changes the circumference of the first rotating wheel assembly 420. Under the premise that the length of the transmission belt 410 remains basically constant, the change in the circumference of the first rotating wheel assembly 420 will inevitably cause its own rotation speed to change relative to the rotation speed of the second rotating wheel assembly 430, thereby realizing the adjustment of the rotation speed of the conveying screw 300.

[0032] Specifically, in the initial stage of device startup, the temperature of the feed pipe 200 and the material inside it is low, requiring more heat and a longer residence time to ensure sufficient plasticization. If the conveying screw 300 rotates too fast at this time, the material will be injected into the mold before reaching the predetermined temperature, resulting in product defects.

[0033] Please see the appendix Figure 1 - Appendix Figure 2 In this embodiment, the drive assembly 500 does not generate a drive action under this low temperature state, the first rotating wheel group 420 maintains its initial minimum circumference, and the conveying screw 300 rotates at the slowest speed at this time, ensuring that the cold material has sufficient heating time in the feed pipe 200.

[0034] As the heating process continues, the heat generated by the heating component 210 accumulates inside the feed pipe 200. The drive component 500 senses the temperature rise and begins to drive the radial telescopic rod 421 to retract inward. The circumference of the first rotating wheel group 420 gradually decreases. With the rotation speed of the second rotating wheel group 430 remaining constant, the diameter of the first rotating wheel group 420 decreases, and its rotation speed increases accordingly. Therefore, the rotation speed of the conveying screw 300 automatically and smoothly increases with the rise in material temperature. When the material reaches the optimal plasticizing temperature, the conveying screw 300 also reaches the preset maximum injection speed, achieving efficient and rapid filling. Conversely, when the temperature inside the feed pipe 200 drops due to a malfunction or intermittent period, the drive component 500 drives the radial telescopic rod 421 to retract, increasing the radial circumference of the first rotating wheel group 420. The rotation speed of the conveying screw 300 then automatically decreases, providing a longer heating time for the material.

[0035] Example 2, please refer to the appendix. Figure 1-5 - Appendix Figure 8This is the second embodiment of the present invention, based on embodiment 1. Further, the first rotating wheel assembly 420 includes, in addition to multiple radial telescopic rods 421, a fixed base plate 422 and an adjusting turntable 423. The fixed base plate 422 is fixedly installed at the end of the conveying screw 300 with its central axis coinciding with the axis of the conveying screw 300. Multiple T-shaped grooves or dovetail grooves extending radially are formed on the fixed base plate 422. The multiple radial telescopic rods 421 are slidably installed in the corresponding T-shaped grooves, constraining the radial telescopic rods 421 to only... The adjusting turntable 423 slides radially back and forth along the fixed base plate 422. It is coaxially arranged with the fixed base plate 422 and rotatably mounted on the fixed base plate 422, for example, supported by needle roller bearings or sliding bearings. The adjusting turntable 423 is provided with multiple guide grooves 424. Each guide groove 424 is a through groove or blind groove that extends in a spiral or inclined straight line on the surface of the adjusting turntable 423. Each radial telescopic rod 421 is fixed with a drive slider 424a, which is slidably embedded in the corresponding guide groove 424.

[0036] Please see the appendix Figure 3 - Appendix Figure 4 When the adjusting turntable 423 rotates forward or backward relative to the fixed base plate 422, the groove wall of the guide groove 424 applies a directional tilting force to the drive slider 424a. Since the drive slider 424a is fixedly connected to the radial telescopic rod 421, and the radial telescopic rod 421 is restricted in its direction of movement by the T-shaped groove on the fixed base plate 422, this force is converted into a radial force that causes the drive slider 424a to slide in the radial direction, forcing the radial telescopic rod 421 to slide outward or inward along the radial direction of the fixed base plate 422. By reasonably designing the helix angle of the guide groove 424, a small rotation angle of the adjusting turntable 423 can be used to drive the radial telescopic rod 421 to produce a large radial displacement. Multiple guide grooves 424 are centrally symmetrically distributed on the adjusting turntable 423, ensuring that multiple drive sliders 424a are driven synchronously, thereby ensuring that the radial extension and retraction of multiple radial telescopic rods 421 are completely consistent.

[0037] Please see the appendix Figure 1 Appendix Figure 3 - Appendix Figure 5 and appendix Figure 8Preferably, the bearing disc 520 is also fixedly mounted on the conveying screw 300 in a manner that coincides with the axis of the conveying screw 300, and maintains a certain axial distance from the fixed base disc 422. The guide slide 530 is a cylindrical structure with one end closed and the other end open. Its closed end is fixedly mounted on the bearing disc 520. The medium storage box 540 is a hollow shell filled with a medium. The medium can be liquid at room temperature. Its volume expands significantly as the temperature rises and shrinks as the temperature falls. The medium filled in the medium storage box 540 is preferably phase change thermosensitive paraffin. The medium storage box 540 is connected to the closed end or side wall of the guide slide 530 through a pipeline or directly, so that the internal medium can freely flow into or out of the internal cavity of the guide slide 530.

[0038] To address the issue of delayed heat conduction caused by heat transfer from the outside of the feed pipe 200 to the inside, a heat-conducting blind hole is provided at the center of the conveying screw 300 along its axial direction. One end of the heat-conducting blind hole extends to the heated area of ​​the corresponding heating component 210, and the other end extends to the bearing disk 520. A high thermal conductivity heat pipe or a pure copper heat-conducting rod is embedded in the heat-conducting blind hole. The tail end of the high thermal conductivity heat pipe or the pure copper heat-conducting rod is directly thermally bonded to the outer wall of the medium storage box 540. The heat generated by the heating component 210 is quickly and directly transferred to the medium storage box 540 through the high thermal conductivity heat pipe, which greatly reduces thermal resistance and ensures the real-time response of the drive component 500 to temperature changes.

[0039] The actuator 510 includes a push-pull piston 511 and a lifting push rod 512. The push-pull piston 511 is slidably and sealingly installed in the inner cavity of the guide cylinder 530. One end of the lifting push rod 512 is fixedly connected to the center of the push-pull piston 511, and the other end passes through the guide cylinder 530, extends outward and abuts against a force-bearing inclined block 425 fixed on the adjusting turntable 423. The force-bearing inclined block 425 has an inclined surface that is inclined relative to the adjusting turntable 423, and the end of the lifting push rod 512 slides in contact with the inclined surface.

[0040] Please see the appendix Figure 1 and appendix Figure 4 - Appendix Figure 5In this embodiment, when the temperature of the heating component 210 rises, heat is transferred to the medium storage box 540 through thermal radiation or thermal conduction. The internal medium expands due to heat, increasing its volume. This increased volume leads to an increase in medium pressure, pushing the push-pull piston 511 to slide towards the open end within the guide slide 530. The sliding of the push-pull piston 511 causes the lifting push rod 512 to extend outward synchronously. The end of the extended lifting push rod 512 presses against the inclined surface of the force-bearing inclined block 425. Due to the guiding effect of the inclined surface, the linear motion of the lifting push rod 512 is converted into a thrust acting on the force-bearing inclined block 425, forcing the adjusting turntable 423 to overcome resistance and rotate around its own axis. Conversely, when the temperature decreases, the medium contracts, the push-pull piston 511 retracts, the lifting push rod 512 retracts, and the adjusting turntable 423 loses its thrust. Under the action of the reset torque, it rotates in the opposite direction and returns to its initial position.

[0041] Example 3, please refer to the appendix. Figure 1-6 This is the third embodiment of the present invention, which is based on embodiment 2. Further, a flow equalization damping plate 541 is fixedly installed inside the medium storage box 540. The flow equalization damping plate 541 divides the medium storage box 540 into an upstream chamber near the medium inlet and a downstream chamber near the outlet. Multiple flow holes 541a penetrating the thickness of the plate are opened on the plate surface of the flow equalization damping plate 541, thereby generating a significant damping effect on the flow of the medium.

[0042] In the injection molding workshop environment, temperature changes caused by operators opening the hatch, starting the cooling system, or controlling the heating component 210 can cause short-term rapid temperature fluctuations near the drive component 500. Without the flow equalization damping plate 541, the medium will respond to these fluctuations, causing the push-pull piston 511 to reciprocate frequently, which in turn causes the adjusting turntable 423 and the radial telescopic rod 421 to extend and retract frequently, resulting in meaningless fluctuations in the speed of the conveying screw 300 and potentially exacerbating the wear of the drive belt 410. By setting the flow equalization damping plate 541 and its flow equalization damping plate 541, the temperature of the drive component 500 can be significantly reduced. When the medium flows into or out of the guide slide 530, it must slowly pass through the holes 541a. This flow resistance creates a delay effect. When the energy is insufficient to drive a large amount of medium to pass quickly through the flow equalization damping plate 541 in a short time, it will not cause effective displacement of the push-pull piston 511. Only those temperature changes with a long duration and large amplitude can accumulate enough medium volume change pressure to push the medium slowly through the flow holes 541a, thereby driving the actuator to move. This effectively ensures the smoothness of the conveying screw 300 rotation speed.

[0043] Please see the appendix Figure 6Furthermore, inside each flow passage 541a, an elastic deformable sphere 542 made of an elastic material, such as oil-resistant and high-temperature resistant rubber, is fixedly installed. Under normal operating pressure and flow rate, the elastic deformable sphere 542 maintains its original spherical or ellipsoidal shape, forming a narrow annular gap between itself and the inner wall of the flow passage 541a. This is the normal flow path of the medium, providing the damping effect described above. When the pressure is too high, the elastic deformable sphere 542 deforms, increasing the flow rate and preventing component damage.

[0044] Example 4, please refer to the appendix. Figure 1-7 - Appendix Figure 8 This is the fourth embodiment of the present invention. Based on embodiment 2 or 3, this embodiment further and specifically includes an extension protective cylinder 531 in the drive assembly 500. The extension protective cylinder 531 is a hollow cylindrical structure sleeved on the outside of the lifting push rod 512. One end of the cylinder is sealed and connected to the open end of the guide slide cylinder 530. After the lifting push rod 512 passes through the inside of the guide slide cylinder 530, it moves through the central cavity of the entire extension protective cylinder 531.

[0045] Please see the appendix Figure 7 The push-pull piston 511 includes an upper piston plate 511a, a lower piston plate 511b, and an elastic support member. The upper piston plate 511a is fixed to the lifting push rod 512, and the lower piston plate 511b is slidably sleeved on the lifting push rod 512 and located on the side of the upper piston plate 511a closer to the medium storage box 540. The elastic support member can be a helical compression spring or an elastic washer, and is compressed between the upper piston plate 511a and the lower piston plate 511b, always providing support. The two apply mutually separate thrusts. Under normal working conditions, the elastic support will open the upper piston plate 511a and the lower piston plate 511b, maintaining a preset gap between them. The inner center of the lifting push rod 512 is provided with a drain channel 512c along the axial direction. On the side wall of the lifting push rod 512, between the upper piston plate 511a and the lower piston plate 511b, a pressure relief hole 512a is provided, which is connected to the drain channel 512c.

[0046] In this embodiment, when the lifting push rod 512 is stuck in the extended position and cannot retract for some reason, the heating component 210 will still cause the medium to continue to expand and the medium pressure to increase. At this time, since the lifting push rod 512 and the upper piston plate 511a cannot move, the continuously increasing medium pressure will be applied to the lower piston plate 511b. When the pressure value exceeds the preset safety threshold, the medium pressure pushes the lower piston plate 511b to overcome the elastic force of the elastic support and slide towards the upper piston plate 511a. The movement of the lower piston plate 511b gradually compresses the elastic support until the end face of the lower piston plate 511b is reached. The pressure relief hole 512a, which was originally located between the upper piston plate 511a and the lower piston plate 511b, is completely exposed and no longer blocked. The high-pressure medium then flows from the pressure relief hole 512a into the drainage channel 512c inside the lifting push rod 512 and flows out along the drainage channel 512c. Finally, it is directly guided into the transparent rotating ring 431 fixed on the outer circumference of the bearing disk 520.

[0047] Please see the appendix Figure 1 and appendix Figure 8 The transparent rotating ring 431 is an annular cavity made of a transparent material, such as polycarbonate. Its interior is pre-filled with a substance that changes color when wetted by a medium, such as absorbent paper that changes color when exposed to oil or pH test paper that changes color when exposed to specific chemicals. When the leaked medium flows into the transparent rotating ring 431, it comes into contact with the color-changing substance, causing the transparent rotating ring 431 to change from one color, such as colorless, to another bright warning color, such as red. During inspections, operators do not need to disassemble any parts; they can simply observe the color change of the rotating transparent ring 431 to intuitively determine that a deadlock fault has occurred inside the transmission assembly 400, thus enabling timely shutdown and maintenance.

[0048] Example 5, please refer to the appendix. Figure 1 - Appendix Figure 8 In the fifth embodiment of the present invention, the support frame 100 is provided with a mold 110, which has an injection port for receiving molten plastic. The end of the feed pipe 200 is sealed and connected to the injection port of the mold 110. A feed hopper 220 with an upward opening is connected to the feed pipe 200 near the rear end for feeding plastic granules or powder to be processed into the feed pipe 200. The input shaft of the second rotating wheel set 430 is connected to the output shaft of the drive motor through a coupling or belt drive, and the drive motor provides the power required for the operation of the entire device.

[0049] To ensure that the transmission belt 410 maintains appropriate tension when the radial circumference of the first rotating pulley group 420 changes, and to avoid slippage or excessive tightness, a tensioning squeeze wheel 700 is slidably mounted on the support frame 100. The outer circumferential surface of the tensioning squeeze wheel 700 abuts against the outer side of the slack side of the transmission belt 410. The axle of the tensioning squeeze wheel 700 is mounted on a bracket that can move along a slide rail. A compression spring or counterweight is provided behind the bracket. When the radial circumference of the first rotating pulley group 420 increases and the transmission belt 410 is tightened, the transmission belt 410 will squeeze the tensioning squeeze wheel 700 outward, pushing its bracket to slide outward against the elastic force, thereby automatically increasing the clearance space of the tensioning wheel and avoiding excessive belt tension. Conversely, when the radial circumference of the first rotating pulley group 420 decreases, the transmission belt 410 becomes loose, and the tensioning squeeze wheel 700 slides inward under the action of the spring force, tightening the belt again and maintaining the necessary tension.

[0050] Please see the appendix Figure 2 Appendix Figure 4 and appendix Figure 5 To reduce the sliding friction between the lifting push rod 512 and the force-bearing inclined block 425, a friction-reducing ball is fixedly installed at one end of the lifting push rod 512 facing the force-bearing inclined block 425. The friction-reducing ball can roll freely in the hemispherical groove at the end of the lifting push rod 512, and its exposed spherical surface maintains rolling contact with the inclined surface of the force-bearing inclined block 425. When the lifting push rod 512 extends or retracts, rolling friction replaces sliding friction, greatly reducing frictional resistance. This makes the movement of the drive assembly 500 more sensitive and smooth, and also significantly reduces the wear of the inclined surface of the force-bearing inclined block 425, ensuring the accuracy of long-term use.

[0051] To ensure that the adjusting turntable 423 can reliably return to its initial position after the medium cools and contracts, an elastic torsion member 426 is fitted on the adjusting turntable 423. The elastic torsion member 426 can be a helical torsion spring, with one end fixed to the adjusting turntable 423 and the other end fixed to the fixed base plate 422 or the support frame 100. The elastic torsion member 426 always applies a reset torque to the adjusting turntable 423, causing it to rotate towards its initial position, i.e., the position with the smallest radial circumference of the first rotating wheel group 420. During the heating process, the thrust applied by the lifting push rod 512 needs to overcome this reset torque to drive the adjusting turntable 423 to rotate. When the temperature decreases and the thrust disappears or decreases, the elastic potential energy stored in the elastic torsion member 426 is released, automatically driving the adjusting turntable 423 to rotate in the opposite direction, causing the radial telescopic rod 421 to retract.

[0052] Based on the foregoing embodiments, the present invention provides an energy-saving plastic product injection molding production device, the general working principle of which is as follows:

[0053] When the device is started or the material temperature is low, the medium in the medium storage box 540 in the drive assembly 500 is at a low temperature and its volume shrinks. At this time, the actuator 510 does not generate a driving action. The first rotating wheel group 420 maintains its initial circumference. Under the premise that the rotation speed of the second rotating wheel group 430 remains unchanged, the first rotating wheel group 420 has the largest circumference and the slowest rotation speed, thereby driving the conveying screw 300 to rotate at a low speed. This ensures that the low temperature material has sufficient heating time in the feed pipe 200 and avoids product defects caused by forced rapid injection.

[0054] The heating component 210 operates continuously, raising the temperature of the feed pipe 200 and the internal material. Heat is transferred to the medium storage box 540, causing the internal medium to expand due to heat. This increases the volume and generates pressure, pushing the push-pull piston 511 and the lifting push rod 512 inside the guide slide 530 to slide outward. The lifting push rod 512 presses against the force-bearing inclined block 425 on the adjusting turntable 423, converting linear motion into rotational motion. This drives the adjusting turntable 423 to rotate. The guide groove 424 on the adjusting turntable 423 drives multiple radial telescopic rods 421 to slide synchronously inward along the fixed base plate 422 via the drive slider 424a, gradually reducing the circumference of the first rotating wheel set 420. The reduced circumference of the first rotating wheel set 420 causes its rotation speed to increase smoothly, thereby increasing the rotation speed of the conveying screw 300. When the material reaches the optimal plasticizing temperature, the conveying screw 300 reaches the preset maximum injection speed, achieving efficient and rapid filling.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving injection molding production device for plastic products, characterized in that, include: A support frame (100) is provided with a feeding pipe (200), a conveying screw (300) is rotatably provided inside the feeding pipe (200), and a heating component (210) is fixed on the outside of the feeding pipe (200). The transmission assembly (400) includes a first rotating pulley set (420), a second rotating pulley set (430), and a drive belt (410). The first rotating pulley set (420) is drivenly connected to the conveying screw (300) and is drivenly connected to the second rotating pulley set (430) via the drive belt (410). The first rotating pulley set (420) includes a plurality of radially telescopic rods (421) that are slidably distributed and a drive assembly (500); and, When the drive assembly (500) generates power based on the heat change of the heating assembly (210), it drives the multiple radial telescopic rods (421) to slide synchronously, thereby changing the radial circumference of the first rotating wheel set (420) and adjusting the rotation speed.

2. The energy-saving plastic product injection molding production device according to claim 1, characterized in that, The first rotating wheel assembly (420) also includes a fixed base plate (422) fixed on the conveying screw (300), a plurality of radial telescopic rods (421) are slidably disposed on the fixed base plate (422) in the radial direction, an adjusting turntable (423) is rotatably disposed on the fixed base plate (422), a plurality of guide grooves (424) are opened on the adjusting turntable (423), and a driving slider (424a) is fixed on each radial telescopic rod (421) and slidably disposed in the corresponding guide groove (424).

3. The energy-saving plastic product injection molding production device according to claim 2, characterized in that, The drive assembly (500) includes an actuator (510), a bearing disk (520) fixed on the conveying screw (300), a guide slide (530) fixed on the bearing disk (520), and a medium storage box (540) disposed on one side of the guide slide (530), wherein the medium storage box (540) stores a medium.

4. The energy-saving plastic product injection molding production device according to claim 3, characterized in that, The actuator (510) includes a push-pull piston (511) slidably disposed in the guide cylinder (530) and a lifting push rod (512) connected to the push-pull piston (511). A force-bearing inclined block (425) is fixed on the adjusting turntable (423).

5. The energy-saving plastic product injection molding production device according to claim 3, characterized in that, The medium storage box (540) has a flow equalization damping plate (541) fixed inside. The flow equalization damping plate (541) has multiple flow holes (541a) and each flow hole (541a) has an elastic deformable ball (542) fixed inside.

6. The energy-saving plastic product injection molding production device according to claim 1, characterized in that, A tensioning and pressing wheel (700) is slidably mounted on the support frame (100), and the tensioning and pressing wheel (700) abuts against one side of the transmission belt (410).

7. The energy-saving plastic product injection molding production device according to claim 4, characterized in that, The drive assembly (500) also includes an extension protective cylinder (531) disposed on the guide slide (530), the lifting push rod (512) movably passes through the extension protective cylinder (531), the push-pull piston (511) includes an upper piston plate (511a) and a lower piston plate (511b) fixed on the lifting push rod (512), and an elastic support member disposed between the upper piston plate (511a) and the lower piston plate (511b), and a pressure relief hole (512a) is provided on the lifting push rod (512).

8. The energy-saving plastic product injection molding production device according to claim 7, characterized in that, A transparent rotating ring (431) is provided on the outer circumference of the bearing disc (520). When the pressure inside the guide slide (530) is greater than a preset value, the lower piston plate (511b) compresses the elastic support and fits against the upper piston plate (511a), so that the pressure relief hole (512a) is exposed.

9. The energy-saving plastic product injection molding production device according to claim 2, characterized in that, An elastic torsion member (426) is fitted on the adjusting turntable (423), and the elastic torsion member (426) applies a reset torque to the adjusting turntable (423).

10. An energy-saving plastic product injection molding production apparatus according to any one of claims 1-9, characterized in that, The support frame (100) is provided with a mold (110), the feed pipe (200) is located at the injection port of the mold (110), and the feed pipe (200) is connected to a feed hopper (220).

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