Screw propelling mechanism, injection equipment and injection molding machine

Abstract

The utility model belongs to the technical field of injection molding devices, and provides a screw propulsion mechanism, injection equipment and an injection molding machine, the screw propulsion mechanism comprises: a transmission member, the two side surfaces of which are provided with continuously arranged convex tooth parts along the axis direction; the driving part is provided with at least one pair of first gear and second gear, and the at least one pair of first gear and second gear is arranged on the two sides of the transmission part in the axis direction and engaged with the convex tooth part; wherein the screw rod is in transmission connection with one end of the transmission part. Compared with the prior art, through meshing transmission of the convex tooth parts arranged on the two sides of the transmission part and the first gear and the second gear, a precise thread groove and ball matching structure of a traditional ball screw is replaced, complex assemblies such as a ball circulation channel and a reverser are omitted, and the number of parts and machining difficulty are remarkably reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of injection molding equipment, specifically relating to a screw propulsion mechanism, injection equipment, and injection molding machine. Background Technology

[0002] Injection molding equipment is one of the core components of an injection molding machine, primarily used to heat and melt plastic material from a solid state and inject it into the mold cavity under high pressure. This system is crucial for ensuring product quality and production efficiency. Injection molding equipment typically includes the following key components: Screw: The screw not only pushes the molten plastic forward but also heats the plastic granules through its rotational motion, helping them to melt evenly; Power unit: Controls the screw's propulsion and rotation, as well as adjusting the injection pressure and speed.

[0003] In modern injection molding equipment, the axial propulsion of the screw typically relies on a ball screw pair to achieve high-precision linear transmission (e.g., the injection device, molding machine, and control method disclosed in Japanese Patent Application No. JP2012196828A). Specifically, the ball screw pair consists of a screw with precision threaded grooves, a matching nut, and circulating balls. Its working principle is as follows: a motor drives the nut to rotate, and the rolling friction of the balls within the threaded grooves converts the rotational motion into linear motion of the screw, thereby driving the screw to perform the injection action. However, this technical solution has the following significant drawbacks:

[0004] (1) High structural complexity: The ball screw pair needs to be machined with high-precision thread grooves on the screw surface and equipped with auxiliary structures such as ball circulation channels, reversers and cages, resulting in a large number of components and complex assembly process.

[0005] (2) High manufacturing cost: Ball screws have extremely high requirements for material hardness and thread groove machining accuracy, and grinding or polishing processes are required, which significantly increases production costs. In addition, precision balls, reversers and other accessories rely on imports, which further increases supply chain costs. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a screw propulsion mechanism, injection equipment and injection molding machine in light of the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a screw propulsion mechanism is proposed, including: a transmission component, on both sides of which are provided with continuously arranged convex teeth;

[0008] The driving component is provided with at least one pair of first gears and second gears, wherein the at least one pair of first gears and second gears are disposed on both sides of the transmission component along the axial direction and both mesh with the convex tooth portion; wherein,

[0009] The screw is connected to one end of the transmission component in a transmission connection.

[0010] When the driving member drives at least one pair of the first gear and the second gear to rotate, it drives the transmission member to move along the axial direction by meshing with the convex tooth portion, thereby driving the screw to move synchronously and linearly.

[0011] In the aforementioned screw propulsion mechanism, at least one pair of first gears and second gears are symmetrically distributed on both sides of the transmission member, and the rotation axes of at least one pair of first gears and second gears are perpendicular to the movement direction of the transmission member.

[0012] In the aforementioned screw propulsion mechanism, the driving component includes a first motor and a gear set. The output end of the first motor is provided with a drive wheel, which is connected to at least one pair of first gears and second gears for transmission, so as to drive the first gears and second gears to rotate when the first motor is running.

[0013] In one of the aforementioned screw propulsion mechanisms, the gear set includes:

[0014] A first driven wheel and a second driven wheel are coaxially connected to the first gear and are respectively disposed on both sides of the first gear. The first driven wheel meshes with the driving wheel.

[0015] A third driven wheel is coaxially connected to the second gear, and the third driven wheel meshes with the second driven wheel to drive the first driven wheel and the second driven wheel to rotate when the driving wheel rotates.

[0016] In the aforementioned screw propulsion mechanism, the diameters of the first gear and the second gear are equal, and the diameters of the driving wheel, the first gear, and the second gear are all smaller than the diameter of the first driven wheel.

[0017] In the aforementioned screw propulsion mechanism, two pairs of the first gear and the second gear are symmetrically distributed on both sides of the transmission component along the axial direction.

[0018] The aforementioned screw propulsion mechanism also includes:

[0019] The fixed base, the driving component and the transmission component are both disposed in the fixed base, the fixed base is provided with a guide channel, the guide channel is movably abutting against the outer side wall of the transmission component without the serrated part, so as to provide guidance for the movement of the transmission component;

[0020] A connector is connected between the screw and the transmission component to enable a transmission connection between the screw and the transmission component;

[0021] An electronic ruler is mounted on the fixed base, and the sensing end of the electronic ruler extends into the transmission component to detect the movement distance of the transmission component.

[0022] In one of the aforementioned screw propulsion mechanisms, the connecting member includes:

[0023] The main body sleeve is fitted around the outer periphery of the transmission component;

[0024] The bearing has its inner ring fitted around the outside of the transmission component, and its outer ring fixed inside the main body sleeve.

[0025] A connecting sleeve, one end of which is connected to the main body sleeve, and the other end of which is engaged with the screw;

[0026] A retaining ring is attached to the screw and the connecting sleeve to secure the connecting sleeve to the screw.

[0027] This utility model also addresses the above-mentioned technical problems by providing an injection device, comprising:

[0028] The above-mentioned screw propulsion mechanism;

[0029] A second motor is disposed between the screw and the transmission component to drive the screw to rotate.

[0030] This utility model solves the above-mentioned technical problems and also proposes an injection molding machine, including the above-mentioned injection equipment.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The transmission is achieved by meshing the convex teeth on both sides of the transmission component with the first gear and the second gear, which replaces the precision thread groove and ball fit structure of the traditional ball screw, eliminating complex components such as ball circulation channel and reverser, and significantly reducing the number of parts and processing difficulty.

[0033] (2) By symmetrically distributing at least one pair of first gears and second gears on both sides of the transmission component and making their rotation axis perpendicular to the direction of movement of the transmission component, the transmission component is ensured to be subjected to uniform force during movement, thereby improving the stability and reliability of the entire system.

[0034] (3) The linear displacement of the transmission component is detected in real time by electronic ruler, and the first motor and the second motor are controlled separately (responsible for the rotation and propulsion of the screw respectively) to realize the closed-loop adjustment of injection speed and dosage. Attached Figure Description

[0035] Figure 1 This is a perspective view of the injection device of this utility model.

[0036] Figure 2yes Figure 1 The sectional view in the image.

[0037] Figure 3 yes Figure 1 A cross-sectional view from another direction.

[0038] Figure 4 yes Figure 1 A three-dimensional view of the middle part of the structure.

[0039] In the diagram, 100 is the fixed base; 110 is the guide channel; 200 is the transmission component; 210 is the toothed part; 300 is the driving component; 310 is the first gear; 320 is the second gear; 330 is the first motor; 331 is the driving wheel; 340 is the gear set; 341 is the first driven wheel; 342 is the second driven wheel; 343 is the third driven wheel; 400 is the screw; 500 is the connecting component; 510 is the main body sleeve; 520 is the bearing; 530 is the connecting sleeve; 540 is the retaining ring; 600 is the electronic ruler; and 700 is the second motor. Detailed Implementation

[0040] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0042] like Figures 1 to 4 As shown in the figure, this solution mainly focuses on the application of the screw propulsion mechanism in injection equipment and details its specific structure. The aforementioned injection equipment is used in injection molding machines.

[0043] A screw propulsion mechanism includes: a transmission component 200 and a driving component 300.

[0044] Specifically, the transmission member 200 has continuously arranged protruding teeth 210 on both sides of its axial direction; the driving member 300 has at least one pair of first gears 310 and second gears 320, which are arranged on both sides of the transmission member 200 along the axial direction and mesh with the protruding teeth 210; the screw 400 is connected to one end of the transmission member 200; when the driving member 300 drives at least one pair of first gears 310 and second gears 320 to rotate, it drives the transmission member 200 to move along the axial direction through meshing with the protruding teeth 210, thereby driving the screw 400 to move synchronously and linearly.

[0045] The protruding tooth portion 210 can be integrally formed with the transmission component 200, or it can be separately set and then fixed to the transmission component 200 by threaded connection or welding. The tooth shape of the protruding tooth portion 210 can be one of involute tooth shape, circular arc tooth shape or triangular tooth shape, and the tooth pitch of the two protruding tooth portions 210 on both sides must match the tooth pitch of the first gear 310 and the second gear 320.

[0046] In this design, the meshing transmission between the convex teeth 210 on both sides of the transmission component 200 and the first gear 310 and the second gear 320 replaces the precision threaded groove and ball-fitting structure of the traditional ball screw, eliminating complex components such as the ball circulation channel and the reverser, significantly reducing the number of parts and the difficulty of processing. Furthermore, the convex teeth 210 on both sides of the transmission component 200 respectively mesh with the first gear 310 and the second gear 320, ensuring more even force distribution on the transmission component 200 and thus guaranteeing its stable movement.

[0047] It should be noted that at least one pair of first gears 310 and second gears 320 are symmetrically distributed on both sides of the transmission member 200, and the rotation axes of at least one pair of first gears 310 and second gears 320 are perpendicular to the direction of movement of the transmission member 200.

[0048] In this scheme, by symmetrically distributing at least one pair of first gears 310 and second gears 320 on both sides of the transmission member 200 and making their rotation axis perpendicular to the direction of movement of the transmission member 200, the transmission member 200 is ensured to be subjected to uniform force during movement, thereby improving the stability and reliability of the entire system.

[0049] In this solution, the driving component 300 includes a first motor 330 and a gear set 340. The output end of the first motor 330 is provided with a drive wheel 331. The drive wheel 331 is connected to at least one pair of first gears 310 and second gears 320 for transmission, so as to drive the first gears 310 and second gears 320 to rotate when the first motor 330 is running.

[0050] By introducing a first motor 330 and a gear set 340 into the drive unit 300, and using the drive wheel 331 to drive the first gear 310 and the second gear 320 to rotate, the structure of the drive system is simplified, making the entire device more compact and efficient. Furthermore, this design effectively amplifies the motor output torque through the gear set 340, meeting the requirements of high-load injection conditions.

[0051] Specifically, the gear set 340 includes: a first driven gear 341 and a second driven gear 342, both coaxially connected to the first gear 310 and respectively disposed on both sides of the first gear 310, the first driven gear 341 meshing with the driving gear 331; and a third driven gear 343, coaxially connected to the second gear 320, the third driven gear 343 meshing with the second driven gear 342, for driving the first driven gear 341 and the second driven gear 342 to rotate when the driving gear 331 rotates.

[0052] When working, refer to Figure 4 When the first motor 330 drives the driving wheel 331 to rotate, the driving wheel 331 drives the first driven wheel 341 to rotate. Since the first driven wheel 341, the first gear 310, and the second driven wheel 342 are coaxially arranged, they rotate synchronously when the driving wheel 331 rotates. Furthermore, because the third driven wheel 343 meshes with the second driven wheel 342 and is coaxially arranged with the second gear 320, the rotation of the second driven wheel 342 drives the third driven wheel 343 to rotate, which in turn drives the second gear 320 to rotate. This achieves synchronous driving of the first gear 310 and the second gear 320 by the first motor 330.

[0053] In this design, by introducing a gear set 340 consisting of a first driven gear 341, a second driven gear 342, and a third driven gear 343, the power transmission path is further optimized, ensuring the synchronous rotation of the first gear 310 and the second gear 320, thus improving the system's transmission efficiency and stability. Simultaneously, this design effectively reduces the risk of system failure due to single-point faults.

[0054] In a preferred embodiment, the first gear 310 and the second gear 320 are respectively machined onto the outer sides of the first and second rotating shafts, forming a ring gear structure. The first driven gear 341 and the second driven gear 342 are both fixed to the first rotating shaft via a key, while the third driven gear 343 is fixed to the second rotating shaft via a key. Bearings 520 are provided at both ends of the first and second rotating shafts along their axial direction for rotatable connection between the first and second rotating shafts and the fixed component.

[0055] Preferably, the diameters of the first gear 310 and the second gear 320 are equal, and the diameters of the driving wheel 331, the first gear 310 and the second gear 320 are all smaller than the diameter of the first driven wheel 341.

[0056] By making the diameters of the first gear 310 and the second gear 320 equal, and their diameter smaller than that of the first driven gear 341, a higher reduction ratio can be achieved, thereby amplifying the output torque of the first motor 330 to meet the requirements of high-load applications. Furthermore, this design also helps to reduce the overall size and weight of the equipment.

[0057] In another preferred embodiment, two pairs of first gears 310 and second gears 320 are symmetrically distributed on both sides of the transmission component 200 along the axial direction.

[0058] This solution also includes: a fixed base 100, a driving component 300 and a transmission component 200, all of which are disposed within the fixed base 100. A guide channel 110 is provided within the fixed base 100. The guide channel 110 movably abuts against the outer wall of the transmission component 200 without protruding teeth 210, thereby providing guidance for the movement of the transmission component 200; a connecting component 500, which is connected between the screw 400 and the transmission component 200, for providing a transmission connection between the screw 400 and the transmission component 200; and an electronic ruler 600, which is disposed on the fixed base 100, and the sensing end of the electronic ruler 600 extends into the transmission component 200, for detecting the movement distance of the transmission component 200.

[0059] By setting up the fixed base 100 and the guide channel 110, stable guiding support is provided for the transmission component 200, ensuring the precise movement of the transmission component 200. The design of the connector 500 ensures a reliable transmission connection between the screw 400 and the transmission component 200. The use of the electronic ruler 600 enables real-time detection of the movement distance of the transmission component 200, improving the control accuracy and automation level of the entire system.

[0060] In this design, the connector 500 connects the transmission component 200 and the screw 400. The movement of the transmission component 200 drives the screw 400 to move. In addition to axial movement, the screw 400 also needs to rotate within the injection equipment. To prevent the transmission component 200 from rotating when the screw 400 rotates, the connector 500 includes: a main sleeve 510, which is fitted around the outer periphery of the transmission component 200; a bearing 520, whose inner ring is fitted around the outside of the transmission component 200, and whose outer ring is fixed inside the main sleeve 510; a connecting sleeve 530, one end of which is connected to the main sleeve 510, and the other end of which is engaged with the screw 400; and a retaining ring 540, which is engaged with the screw 400 and the connecting sleeve 530 for securing the connecting sleeve 530 to the screw 400.

[0061] During operation, when the screw 400 rotates, the main body sleeve 510, connecting sleeve 530, and retaining ring 540 all rotate synchronously with the screw 400. Because a bearing 520 is installed between the main body sleeve 510 and the transmission component 200, the transmission component 200 will not rotate synchronously with the screw 400 at this time. Preferably, the bearing 520 is a tapered roller bearing 520, which bears the axial force from the transmission component 200 when the transmission component 200 drives the screw 400 to move, thereby ensuring the service life of the bearing 520.

[0062] In this design, the connecting component 500, composed of the main sleeve 510, bearing 520, connecting sleeve 530, and retaining ring 540, ensures a reliable connection between the screw 400 and the transmission component 200, while reducing movement backlash and improving the system's transmission stability and accuracy. The use of bearing 520 also effectively reduces frictional resistance and extends the equipment's service life.

[0063] The injection equipment in this solution also includes a second motor 700, which is preferably a hollow motor, wherein the hollow shaft is fixed to the rotor and connected to the connector 500 via a flat key to achieve the transmission connection between the second motor 700 and the screw 400. Thus, when the second motor 700 is working, it can drive the screw 400 to rotate via the connector 500.

[0064] The working principle of this scheme is as follows: When the first motor 330 is working, it drives the driving wheel 331 to rotate. The rotation of the driving wheel 331 drives the first gear 310 and the second gear 320 to rotate via the first driven wheel 341, the second driven wheel 342, and the third driven wheel 343. The rotation of the first gear 310 and the second gear 320 pushes the transmission component 200 to move along the axial direction, thereby driving the screw 400, which is connected to the transmission component 200 via the connecting member 500, to move linearly. When the second motor 700 is working, it drives the screw 400 to rotate via the connecting member 500.

[0065] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0067] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A screw propulsion mechanism, characterized in that, include: The transmission component has continuously arranged convex teeth on both sides of its axial direction; The driving component is provided with at least one pair of first gears and second gears, wherein the at least one pair of first gears and second gears are disposed on both sides of the transmission component along the axial direction and both mesh with the convex tooth portion; wherein, The screw is connected to one end of the transmission component in a transmission connection. When the driving member drives at least one pair of the first gear and the second gear to rotate, it drives the transmission member to move along the axial direction by meshing with the convex tooth portion, thereby driving the screw to move synchronously and linearly.

2. The screw propulsion mechanism as described in claim 1, characterized in that, At least one pair of the first gear and the second gear are symmetrically distributed on both sides of the transmission member, and the rotation axes of at least one pair of the first gear and the second gear are perpendicular to the direction of movement of the transmission member.

3. The screw propulsion mechanism as described in claim 1, characterized in that, The driving component includes a first motor and a gear set. The output end of the first motor is provided with a drive wheel. The drive wheel is connected to at least one pair of the first gear and the second gear for transmission, so as to drive the first gear and the second gear to rotate when the first motor is running.

4. A screw propulsion mechanism as described in claim 3, characterized in that, The gear set includes: A first driven wheel and a second driven wheel are coaxially connected to the first gear and are respectively disposed on both sides of the first gear. The first driven wheel meshes with the driving wheel. A third driven wheel is coaxially connected to the second gear, and the third driven wheel meshes with the second driven wheel to drive the first driven wheel and the second driven wheel to rotate when the driving wheel rotates.

5. A screw propulsion mechanism as described in claim 4, characterized in that, The diameters of the first gear and the second gear are equal, and the diameters of the driving gear, the first gear, and the second gear are all smaller than the diameter of the first driven gear.

6. A screw propulsion mechanism as described in claim 1, characterized in that, The transmission component has two pairs of first gears and second gears symmetrically distributed on both sides of its axial direction.

7. A screw propulsion mechanism as described in claim 1, characterized in that, Also includes: The fixed base, the driving component and the transmission component are both disposed in the fixed base, the fixed base is provided with a guide channel, the guide channel is movably abutting against the outer side wall of the transmission component without the serrated part, so as to provide guidance for the movement of the transmission component; A connector is connected between the screw and the transmission component to enable a transmission connection between the screw and the transmission component; An electronic ruler is mounted on the fixed base, and the sensing end of the electronic ruler extends into the transmission component to detect the movement distance of the transmission component.

8. A screw propulsion mechanism as described in claim 7, characterized in that, The connector includes: The main body sleeve is fitted around the outer periphery of the transmission component; The bearing has its inner ring fitted around the outside of the transmission component, and its outer ring fixed inside the main body sleeve. A connecting sleeve, one end of which is connected to the main body sleeve, and the other end of which is engaged with the screw; A retaining ring is attached to the screw and the connecting sleeve to secure the connecting sleeve to the screw.

9. An injection device, characterized in that, include: A screw propulsion mechanism as described in any one of claims 1 to 8; A second motor is disposed between the screw and the transmission component to drive the screw to rotate.

10. An injection molding machine, characterized in that, Including the injection device as described in claim 9.

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