A screw connection mechanism for an injection device and an injection device

Abstract

This utility model belongs to the technical field of injection devices, and provides a screw connection mechanism for injection equipment and an injection device. The connection mechanism includes: a hollow shaft, which is fixedly connected to the output end of a motor, and the inner peripheral wall of the hollow shaft is provided with a first limiting structure; a connecting sleeve, which is axially movable and disposed within the hollow shaft and connected to the screw, and the outer peripheral wall of the connecting sleeve is provided with a second limiting structure. Compared with the prior art, this utility model, by providing an inner peripheral wall with a first limiting structure within the hollow shaft and a matching second limiting structure on the outer peripheral wall of the connecting sleeve, allows the two to cooperate through multi-faceted contact. This enables the connecting sleeve and the screw to rotate synchronously when the hollow shaft rotates, while allowing the connecting sleeve to move freely along the axial direction. This structure simplifies the complexity of traditional connection structures, avoids problems such as poor fit and clearance accumulation caused by multi-stage connections or rolling elements, and improves transmission efficiency and equipment service life.

Description

Technical Field

[0001] This utility model belongs to the field of injection device technology, specifically relating to a screw connection mechanism for injection equipment and an injection device. Background Technology

[0002] The injection device includes a heating cylinder for heating and melting resin, a screw that is rotatable and retractable within the heating cylinder, a metering motor for rotating the screw, and an injection motor for retracting the screw. The screw, metering motor, and injection motor are all mounted on the same axis, resulting in low overall inertia and good responsiveness.

[0003] Traditional injection molding machines typically include a hydraulic cylinder, a motor, a connecting device, and a screw. The motor, connected to the screw via the connecting structure, drives the screw to rotate, thus providing molten material to the mold. The hydraulic cylinder enables the axial movement of the screw. The connecting structure in traditional injection molding machines is relatively complex, requires high assembly precision, and has high maintenance and replacement costs. For example, some structures using multi-stage connections or rolling elements are prone to problems such as poor fit and accumulated clearances in practical applications, which in turn affect transmission efficiency and equipment lifespan. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a screw connection mechanism for injection equipment and an injection equipment in light of the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: A screw connection mechanism for injection equipment is proposed, connected between the screw and the motor that drives the screw to rotate, for driving the screw to rotate. The connection mechanism includes:

[0006] A hollow shaft is fixedly connected to the output end of the motor, and a first limiting structure is provided on the inner peripheral wall of the hollow shaft;

[0007] A connecting sleeve, which is axially movable within the hollow shaft and connected to the screw, has a second limiting structure on its outer peripheral wall that cooperates with the first limiting structure; wherein...

[0008] The first limiting structure and the second limiting structure cooperate through multi-face contact to drive the connecting sleeve and the screw to rotate synchronously when the hollow shaft rotates, while allowing the connecting sleeve and the screw to move relative to each other along the axial direction of the hollow shaft.

[0009] In the aforementioned screw connection mechanism for an injection device, the contact surfaces of the second limiting structure are distributed at equal angular intervals along the circumferential direction to form a uniform torque transmission surface.

[0010] In the aforementioned screw connection mechanism for an injection device, the outer peripheral wall of the connecting sleeve is a polygonal cylindrical surface, and the first limiting structure is an inner peripheral wall contour adapted to the polygonal cylindrical surface.

[0011] In the aforementioned screw connection mechanism for an injection device, the second limiting structure is a spline structure, and the first limiting structure is a keyway structure located on the inner peripheral wall of the hollow shaft, wherein the spline structure and the keyway structure mesh.

[0012] In the aforementioned screw connection mechanism for an injection device, a connection is made between a screw and a motor that drives the screw to rotate, for driving the screw to rotate. The connection mechanism includes:

[0013] A hollow shaft is fixedly connected to the output end of the motor, and a first limiting structure is provided on the inner peripheral wall of the hollow shaft;

[0014] A connecting sleeve is connected to the screw, and the outer peripheral wall of the connecting sleeve is provided with a second limiting structure;

[0015] An intermediate sleeve, axially movable, is disposed between the hollow shaft and the connecting sleeve. The outer peripheral wall of the intermediate sleeve is provided with a third limiting structure that mates with the first limiting structure, and the inner peripheral wall is provided with a fourth limiting structure that mates with the second limiting structure.

[0016] The first limiting structure and the third limiting structure cooperate through multi-face contact to drive the connecting sleeve to rotate when the hollow shaft rotates, and to allow the connecting sleeve to move relative to the hollow shaft. The second limiting structure and the fourth limiting structure cooperate through multi-face contact to drive the screw to rotate when the connecting sleeve rotates.

[0017] In the aforementioned screw connection mechanism for an injection device, the outer peripheral wall of the intermediate sleeve is a polygonal cylindrical structure, forming the third limiting structure, and the first limiting structure is a hollow shaft inner peripheral wall profile that matches the polygonal cylindrical structure.

[0018] The inner peripheral wall of the intermediate sleeve is a polygonal cylindrical structure, forming the fourth limiting structure. The second limiting structure is the outer peripheral wall contour of the connecting sleeve that matches the polygonal cylindrical structure.

[0019] In the aforementioned screw connection mechanism for an injection device, the contact surface of the intermediate sleeve is provided with a plurality of rolling elements spaced apart along the axial direction of the hollow shaft.

[0020] In the aforementioned screw connection mechanism for an injection device, a connection is made between a screw and a motor that drives the screw to rotate, for driving the screw to rotate. The connection mechanism includes:

[0021] A hollow shaft is fixedly connected to the output end of the motor;

[0022] A connecting sleeve, which is axially movable within the hollow shaft and connected to the screw;

[0023] A snap-fit ​​component, disposed between the hollow shaft and the connecting sleeve, is used to drive the connecting sleeve to rotate synchronously with the screw when the hollow shaft rotates; wherein...

[0024] The contact surface of the snap-fit ​​component engages simultaneously with both the hollow shaft and the connecting sleeve.

[0025] In the aforementioned screw connection mechanism for an injection device, the snap-fit ​​component is a flat key, and both the hollow shaft and the connecting sleeve are provided with keyways that snap-fit ​​with the flat key.

[0026] This utility model also addresses the above-mentioned technical problems by providing an injection device, including the aforementioned screw connection mechanism for injection devices.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) By setting an inner peripheral wall with a first limiting structure inside the hollow shaft and setting a second limiting structure that cooperates with it on the outer peripheral wall of the connecting sleeve, the two can cooperate through multi-face contact, and can drive the connecting sleeve and the screw to rotate synchronously when the hollow shaft rotates. At the same time, the connecting sleeve is allowed to move freely along the axial direction. This structure simplifies the complexity of the traditional connection structure, avoids problems such as poor fit and gap accumulation caused by multi-stage connection or rolling elements, improves transmission efficiency and equipment service life, and has the advantages of simple structure, convenient assembly and low maintenance cost.

[0029] (2) By distributing the contact surfaces of the second limiting structure at equal angular intervals along the circumference, a uniform torque transmission surface is formed, which makes the force more uniform during the torque transmission process, reduces the phenomenon of local stress concentration, improves the smoothness and reliability of the transmission, and extends the service life of the connecting mechanism.

[0030] (3) By setting an intermediate sleeve, the transmission relationship between the hollow shaft and the connecting sleeve is realized in segments, so that the hollow shaft drives the connecting sleeve to rotate through the intermediate sleeve, and the connecting sleeve drives the screw to rotate. This segmented transmission structure can effectively alleviate the stress concentration problem between different components, while maintaining the freedom of axial movement, thereby improving the adaptability and operational stability of the connecting mechanism. While ensuring transmission efficiency, this structure further simplifies the assembly process and improves the convenience of maintenance. Attached Figure Description

[0031] Figure 1 This is a perspective view of an injection device according to this utility model.

[0032] Figure 2 yes Figure 1 Top view.

[0033] Figure 3 yes Figure 2 Sectional view along the AA direction.

[0034] Figure 4 This is an exploded view of a specific structure of the connecting mechanism in Embodiment 1.

[0035] Figure 5 This is an exploded view of another specific structure of the connecting mechanism in Embodiment 1.

[0036] Figure 6 This is an exploded view of the connecting mechanism in Embodiment 2.

[0037] Figure 7 This is an exploded view of the connecting mechanism in Embodiment 3.

[0038] In the diagram, 100 is the screw; 200 is the motor; 300 is the connecting mechanism; 310 is the hollow shaft; 311 is the first limiting structure; 320 is the connecting sleeve; 321 is the second limiting structure; 330 is the intermediate sleeve; 331 is the third limiting structure; 332 is the fourth limiting structure; 333 is the rolling element; 340 is the keyway; 400 is the hydraulic cylinder; and 410 is the piston rod. Detailed Implementation

[0039] 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.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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 indicator will also change accordingly.

[0041] like Figures 1 to 5 As shown, this solution mainly focuses on the specific structure of the connecting mechanism 300 in the injection equipment and its application in the injection equipment.

[0042] Example 1

[0043] A screw connection mechanism 300 for an injection device is connected between a screw 100 and a motor 200 that drives the screw 100 to rotate, and is used to drive the screw 100 to rotate. The connection mechanism 300 includes a hollow shaft 310 and a connecting sleeve 320.

[0044] Specifically, the hollow shaft 310 is fixedly connected to the output end of the motor 200, and the inner peripheral wall of the hollow shaft 310 is provided with a first limiting structure 311; the connecting sleeve 320 is axially movable inside the hollow shaft 310 and connected to the screw 100, and the outer peripheral wall of the connecting sleeve 320 is provided with a second limiting structure 321 that cooperates with the first limiting structure 311; wherein, the first limiting structure 311 and the second limiting structure 321 cooperate through a multi-face contact method, which is used to drive the connecting sleeve 320 and the screw 100 to rotate synchronously when the hollow shaft 310 rotates, while allowing the connecting sleeve 320 and the screw 100 to move relative to each other along the axial direction of the hollow shaft 310.

[0045] In this design, the motor 200 includes a stator, a rotor, and coils. The rotor is connected to the hollow shaft 310 and is used to drive the hollow shaft 310 to rotate when the motor 200 is working. The screw 100 is connected to the connecting sleeve 320 through a snap-fit ​​structure and is used to drive the screw 100 to rotate synchronously when the connecting sleeve 320 rotates. The piston rod 410 of the hydraulic cylinder 400 is connected to the connecting mechanism 300 through a bearing and is used to drive the screw 100 to move axially through the connecting mechanism 300 when the hydraulic cylinder 400 is working, and to keep the piston rod 410 stationary when the motor 200 drives the screw 100 to rotate.

[0046] The connecting mechanism 300 in this solution, by providing an inner peripheral wall with a first limiting structure 311 within the hollow shaft 310 and a second limiting structure 321 that cooperates with it on the outer peripheral wall of the connecting sleeve 320, allows the two to engage through multi-faceted contact. This enables the connecting sleeve 320 and the screw 100 to rotate synchronously when the hollow shaft 310 rotates, while allowing the connecting sleeve 320 to move freely along the axial direction. This structure simplifies the complexity of traditional connecting structures, avoids problems such as poor fit and clearance accumulation caused by multi-stage connections or rolling elements, improves transmission efficiency and equipment service life, and has the advantages of simple structure, convenient assembly, and low maintenance cost.

[0047] Furthermore, the contact surfaces of the second limiting structure 321 are distributed at equal angular intervals along the circumference to form a uniform torque transmission surface.

[0048] The contact surfaces of the second limiting structure 321 are distributed at equal angular intervals along the circumference to form a uniform torque transmission surface, which makes the force more uniform during the torque transmission process, reduces the phenomenon of local stress concentration, improves the smoothness and reliability of transmission, and extends the service life of the connecting mechanism 300.

[0049] It is worth mentioning that, as a specific embodiment of the connecting mechanism 300, the outer peripheral wall of the connecting sleeve 320 is a polygonal cylindrical structure, and the first limiting structure 311 is the inner peripheral wall contour of the hollow shaft 310 that is adapted to the polygonal cylindrical surface.

[0050] The polygon can be a quadrilateral, pentagon, hexagon, etc. By setting the outer peripheral wall of the connecting sleeve 320 as a polygonal cylindrical structure and matching it with the first limiting structure 311 of the inner peripheral wall of the hollow shaft 310, efficient torque transmission can be achieved while maintaining the free movement of the connecting sleeve 320 in the axial direction. This structural design is simple, easy to process and assemble, helps reduce manufacturing costs, and improves transmission accuracy.

[0051] As another specific embodiment of the connecting mechanism 300, the second limiting structure 321 is a spline structure, and the first limiting structure 311 is a keyway structure provided on the inner peripheral wall of the hollow shaft 310, wherein the spline structure and the keyway structure mesh.

[0052] The use of a spline and keyway structure as the second limiting structure 321 and the first limiting structure 311 enables higher precision and stability in torque transmission between the connecting sleeve 320 and the hollow shaft 310, while still maintaining axial relative movement capability. The spline structure has good alignment and high load-bearing capacity, further improving the reliability and service life of the connecting mechanism 300.

[0053] Example 2

[0054] A screw connection mechanism 300 for an injection device is connected between a screw 100 and a motor 200 that drives the screw 100 to rotate, and is used to drive the screw 100 to rotate. The connection mechanism 300 includes a hollow shaft 310, a connecting sleeve 320 and an intermediate sleeve 330.

[0055] Specifically, the hollow shaft 310 is fixedly connected to the output end of the motor 200, and the inner peripheral wall of the hollow shaft 310 is provided with a first limiting structure 311; the connecting sleeve 320 is connected to the screw 100, and the outer peripheral wall of the connecting sleeve 320 is provided with a second limiting structure 321; the intermediate sleeve 330 is axially movable between the hollow shaft 310 and the connecting sleeve 320, and the outer peripheral wall of the intermediate sleeve 330 is provided with a third limiting structure 331 that cooperates with the first limiting structure 311, and the inner peripheral wall is provided with a fourth limiting structure 332 that cooperates with the second limiting structure 321; wherein, the first limiting structure 311 and the third limiting structure 331 cooperate in a multi-faceted contact manner to drive the connecting sleeve 320 to rotate when the hollow shaft 310 rotates, and to allow the connecting sleeve 320 to move relative to the hollow shaft 310; the second limiting structure 321 and the fourth limiting structure 332 cooperate in a multi-faceted contact manner to drive the screw 100 to rotate when the connecting sleeve 320 rotates.

[0056] This embodiment is similar to the structure in Embodiment 1. Both adopt the shape limiting method and increase the contact area between the structures so that when the hollow shaft 310 rotates, it can drive the connecting sleeve 320 and the screw 100 to rotate synchronously, while allowing the connecting sleeve 320 to move freely along the axial direction.

[0057] In this embodiment, the transmission relationship between the hollow shaft 310 and the connecting sleeve 320 is segmented by setting an intermediate sleeve 330. The hollow shaft 310 drives the connecting sleeve 320 to rotate via the intermediate sleeve 330, and the connecting sleeve 320 then drives the screw 100 to rotate. This segmented transmission structure effectively alleviates stress concentration between different components while maintaining the freedom of axial movement, thereby improving the adaptability and operational stability of the connecting mechanism 300. This structure, while ensuring transmission efficiency, further simplifies the assembly process and improves maintenance convenience.

[0058] Furthermore, the outer peripheral wall of the intermediate sleeve 330 is a polygonal cylindrical structure, forming a third limiting structure 331, and the first limiting structure 311 is the inner peripheral wall contour of the hollow shaft 310 that matches the polygonal cylindrical structure; the inner peripheral wall of the intermediate sleeve 330 is a polygonal cylindrical structure, forming a fourth limiting structure 332, and the second limiting structure 321 is the outer peripheral wall contour of the connecting sleeve 320 that matches the polygonal cylindrical structure.

[0059] The inner and outer peripheral walls of the intermediate sleeve 330 both adopt a polygonal cylindrical structure, forming matching limiting structures with the hollow shaft 310 and the connecting sleeve 320, respectively. This makes the torque transmission between components more uniform and stable, avoiding transmission errors caused by poor fit. This structural design is reasonable, facilitates processing and assembly, and helps improve the reliability of the overall transmission system.

[0060] It is worth mentioning that the contact surface of the intermediate sleeve 330 is provided with a number of rolling elements 333 at intervals along the axial direction of the hollow shaft 310.

[0061] The rolling element 333 can be a roller or ball mounted on the intermediate sleeve 330. Arranging several rolling elements 333 on the contact surface of the intermediate sleeve 330 can significantly reduce the sliding friction resistance between the intermediate sleeve 330 and the hollow shaft 310 and connecting sleeve 320, improving transmission efficiency, reducing wear, and extending the service life of the connecting mechanism 300. The rolling element 333 also improves the dynamic response performance during transmission and enhances the operational stability of the injection equipment.

[0062] Example 3

[0063] A screw connection mechanism 300 for an injection device is connected between a screw 100 and a motor 200 that drives the screw 100 to rotate, and is used to drive the screw 100 to rotate. The connection mechanism 300 includes a hollow shaft 310, a connecting sleeve 320, and a snap-fit ​​structure.

[0064] Specifically, the hollow shaft 310 is fixedly connected to the output end of the motor 200; the connecting sleeve 320 is axially movable inside the hollow shaft 310 and connected to the screw 100; the snap-fit ​​structure is disposed between the hollow shaft 310 and the connecting sleeve 320, and is used to drive the connecting sleeve 320 to rotate synchronously with the screw 100 when the hollow shaft 310 rotates; wherein, the contact surface of the snap-fit ​​structure snaps into both the hollow shaft 310 and the connecting sleeve 320.

[0065] The biggest difference between the connecting mechanism 300 in this embodiment and the structure in Embodiment 1 is that this embodiment replaces the external limiting structure in Embodiment 1 by setting a snap-fit ​​structure between the hollow shaft 310 and the connecting sleeve 320.

[0066] By providing a snap-fit ​​connector between the hollow shaft 310 and the connecting sleeve 320, the two can rotate synchronously during rotation while maintaining relative axial movement. This snap-fit ​​connector has a simple design, high transmission torque, and effectively avoids slippage or transmission failure caused by poor fit in traditional connection structures, thereby improving the stability and reliability of the connecting mechanism 300.

[0067] Furthermore, the snap-fit ​​component is a flat key, and both the hollow shaft 310 and the connecting sleeve 320 are provided with keyways 340 that snap-fit ​​with the flat key.

[0068] In this embodiment, a flat key is used as the snap-fit ​​connector, and corresponding keyways 340 are provided on the hollow shaft 310 and the connecting sleeve 320, which enables reliable torque transmission. The structure is simple, easy to manufacture and assemble, and facilitates later maintenance and replacement. This structure has good centering and load-bearing capacity, meeting the transmission stability requirements of high-precision injection equipment.

[0069] It should be noted that in this utility model, 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 those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. 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 defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0070] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When 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 protection scope claimed by this utility model.

[0071] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model 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 this utility model or exceeding the scope defined by the appended claims.

Claims

1. A screw connecting mechanism for an injection apparatus, which is connected between a screw and a motor that drives the screw to rotate, for driving the screw to rotate, characterized in that, The connecting mechanism includes: A hollow shaft is fixedly connected to the output end of the motor, and a first limiting structure is provided on the inner peripheral wall of the hollow shaft; A connecting sleeve, which is axially movable within the hollow shaft and connected to the screw, has a second limiting structure on its outer peripheral wall that cooperates with the first limiting structure; wherein... The first limiting structure and the second limiting structure cooperate through multi-face contact to drive the connecting sleeve and the screw to rotate synchronously when the hollow shaft rotates, while allowing the connecting sleeve and the screw to move relative to each other along the axial direction of the hollow shaft.

2. A screw connecting mechanism for an injection apparatus as defined in claim 1, characterized in that The contact surfaces of the second limiting structure are distributed at equal angular intervals along the circumference to form a uniform torque transmission surface.

3. The screw connection mechanism for an injection device as described in claim 2, characterized in that, The outer peripheral wall of the connecting sleeve is a polygonal cylindrical surface, and the first limiting structure is an inner peripheral wall contour that is adapted to the polygonal cylindrical surface.

4. A screw connection mechanism for an injection device as described in claim 2, characterized in that, The second limiting structure is a spline structure, and the first limiting structure is a keyway structure provided on the inner peripheral wall of the hollow shaft. The spline structure and the keyway structure mesh with each other.

5. A screw connection mechanism for an injection device, connected between a screw and a motor that drives the screw to rotate, for driving the screw to rotate, characterized in that, The connecting mechanism includes: A hollow shaft is fixedly connected to the output end of the motor, and a first limiting structure is provided on the inner peripheral wall of the hollow shaft; A connecting sleeve is connected to the screw, and the outer peripheral wall of the connecting sleeve is provided with a second limiting structure; An intermediate sleeve, axially movable, is disposed between the hollow shaft and the connecting sleeve. The outer peripheral wall of the intermediate sleeve is provided with a third limiting structure that mates with the first limiting structure, and the inner peripheral wall is provided with a fourth limiting structure that mates with the second limiting structure. The first limiting structure and the third limiting structure cooperate through multi-face contact to drive the connecting sleeve to rotate when the hollow shaft rotates, and to allow the connecting sleeve to move relative to the hollow shaft. The second limiting structure and the fourth limiting structure cooperate through multi-face contact to drive the screw to rotate when the connecting sleeve rotates.

6. A screw connection mechanism for an injection device as described in claim 5, characterized in that, The outer peripheral wall of the intermediate sleeve is a polygonal cylindrical structure, forming the third limiting structure. The first limiting structure is the hollow shaft inner peripheral wall contour that matches the polygonal cylindrical structure. The inner peripheral wall of the intermediate sleeve is a polygonal cylindrical structure, forming the fourth limiting structure. The second limiting structure is the outer peripheral wall contour of the connecting sleeve that matches the polygonal cylindrical structure.

7. A screw connection mechanism for an injection device as described in claim 5, characterized in that, The contact surface of the intermediate sleeve is provided with a plurality of rolling elements at intervals along the axial direction of the hollow shaft.

8. A screw connection mechanism for an injection device, connected between a screw and a motor that drives the screw to rotate, for driving the screw to rotate, characterized in that, The connecting mechanism includes: A hollow shaft is fixedly connected to the output end of the motor; A connecting sleeve, which is axially movable within the hollow shaft and connected to the screw; A snap-fit ​​component, disposed between the hollow shaft and the connecting sleeve, is used to drive the connecting sleeve to rotate synchronously with the screw when the hollow shaft rotates; wherein... The contact surface of the snap-fit ​​component engages simultaneously with both the hollow shaft and the connecting sleeve.

9. A screw connection mechanism for an injection device as described in claim 8, characterized in that, The snap-fit ​​component is a flat key, and both the hollow shaft and the connecting sleeve are provided with keyways that snap-fit ​​with the flat key.

10. An injection device, comprising a screw connection mechanism for an injection device as described in any one of claims 1 to 9.

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