Electric injection moving structure of injection molding machine
By introducing a combination of a drive device with a holding brake function and an elastic component into the injection molding machine, the problems of high energy consumption and short lifespan of the drive device during the locking process of the injection mechanism are solved, achieving the effects of energy saving and life extension.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SAGAMI HEAVY IND (NINGBO) CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-15
AI Technical Summary
In existing injection molding machines, the injection mechanism consumes a lot of energy during the locking process, the drive device has a short lifespan, and it needs to withstand impact loads for a long time.
The first drive device with a holding brake function is combined with an elastic element. The locking effect is maintained by the elastic force of the elastic element, avoiding the drive device from directly bearing the impact force and absorbing part of the impact force by elastic deformation.
It saves energy, extends the life of the drive unit, reduces costs, and improves the stability of the locking effect.
Smart Images
Figure CN224240269U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding machine technology, and more specifically, to an electric injection displacement structure for an injection molding machine. Background Technology
[0002] In existing injection molding machines, the injection mechanism moves along a slide rail under the drive of the first drive unit. Specifically, before injection, the injection mechanism needs to move towards the clamping mechanism until the injection nozzle aligns with and remains in contact with the mold cavity.
[0003] In existing technologies, the clamping force is typically increased to a set value by continuously outputting torque through a first drive device, which in turn increases the clamping force via a lead screw. During injection and holding pressure, the control system dynamically adjusts the output of the first drive device to compensate for minor displacements caused by injection impact or thermal expansion, thus maintaining the clamping effect. However, the first drive device operates continuously, consuming significant energy. Furthermore, to counteract the impact force generated during injection, the load on the drive device increases instantaneously, reducing its lifespan and increasing costs. Utility Model Content
[0004] To address at least one of the aforementioned problems, this utility model first provides an electric injection transfer structure for an injection molding machine, comprising an injection mechanism, a mold clamping mechanism, an elastic element, and a first ball screw. The injection mechanism is equipped with a first drive device with a brake function. The first ball screw includes a lead screw and a lead screw nut. The lead screw nut is sleeved on the lead screw and moves along the lead screw axial direction. The first drive device is connected to and drives the lead screw to rotate. The mold clamping mechanism is provided with a connecting rod. The end of the connecting rod is provided with a limiting plate. The connecting rod passes through the outer wall of the lead screw nut and restricts the rotation of the lead screw nut. The two ends of the elastic element abut against the lead screw nut and the limiting plate, respectively.
[0005] When the lead screw rotates in the forward direction, the lead screw nut moves backward and presses the elastic element to the limit position. Then the lead screw nut stops moving, and the lead screw drives the injection mechanism to move forward until it docks with the mold locking mechanism. When the docking is successful, the first drive device brakes and locks the lead screw so that it cannot rotate, and the elastic element restricts the injection mechanism from moving backward.
[0006] Optionally, it also includes a movable plate, wherein the lead screw nut is fixedly connected to the movable plate and drives the movable plate to move, and the front and rear ends of the elastic member respectively abut against the movable plate and the limiting plate.
[0007] Optionally, there are two connecting rods, both of which slide through the movable plate. The limiting plate simultaneously fixes the two connecting rods, and the connecting rods and the movable plate cooperate to restrict the rotation of the lead screw nut.
[0008] Optionally, there are two elastic elements, each sleeved on one of the two connecting rods.
[0009] Optionally, the bottom of the injection mechanism is provided with an injection base, and the lead screw and the injection base are rotatably connected by bearings.
[0010] Optionally, the bottom of the injection base is provided with a slide rail, and the injection base is slidably connected to the slide rail.
[0011] Optionally, the first driving device is a three-phase geared motor, and the elastic element is a mechanical spring.
[0012] Optionally, the injection mechanism includes an injection assembly, which includes a first driving wheel, a first driven wheel, a first synchronous belt, a second drive device, and a second ball screw. The output shaft of the second drive device is connected to and drives the first driving wheel to rotate. The first driving wheel and the first driven wheel are connected by the first synchronous belt. The first driven wheel and the screw of the second ball screw are connected to the second ball screw and provide power to the second ball screw.
[0013] Optionally, the injection mechanism further includes a sol assembly, which includes a sol shaft, a second driving wheel, a second driven wheel, a second synchronous belt, and a third drive device. The third drive device is connected to and drives the second driving wheel to rotate. The second driving wheel and the second driven wheel are connected by the second synchronous belt. The second driven wheel is connected to the sol shaft and drives the sol shaft to rotate.
[0014] Optionally, both the second drive device and the third drive device are permanent magnet servo motors.
[0015] Compared to existing technologies that rely on the output power of the drive mechanism to compensate for displacement and achieve a locking effect, this invention maintains the locking effect by using the elastic force of the elastic element to push the injection mechanism forward after successful docking. This not only saves energy, but also allows the elastic deformation of the elastic element to absorb some of the impact force, preventing the first drive device from directly bearing extreme loads and extending the motor's lifespan. Attached Figure Description
[0016] Figure 1 This is a structural diagram of the electric injection displacement structure of the injection molding machine according to an embodiment of the present invention;
[0017] Figure 2 This is a bottom view of the electric injection displacement structure of the injection molding machine according to an embodiment of the present utility model;
[0018] Figure 3 for Figure 2 Enlarged view of section A in the middle;
[0019] Figure 4 The structure of the injection mechanism in this embodiment of the utility model Figure 1 ;
[0020] Figure 5 The structure of the injection mechanism in this embodiment of the utility model Figure 2 .
[0021] Explanation of reference numerals in the attached figures:
[0022] 1. Injection mechanism; 11. Injection base; 12. Slide rail; 13. Injection assembly; 131. First drive wheel; 132. First driven wheel; 133. First synchronous belt; 134. Second drive device; 14. Solvent assembly; 141. Second drive wheel; 142. Second driven wheel; 143. Second synchronous belt; 144. Third drive device; 2. Mold clamping mechanism; 21. Connecting rod; 22. Limiting plate; 3. Elastic element; 4. First ball screw; 41. Screw; 42. Screw nut; 43. Moving plate; 5. First drive device. Detailed Implementation
[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0024] The accompanying drawings of the embodiments of this utility model provide a coordinate system XYZ, where the positive direction of the X-axis represents the left and the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the front and the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top and the negative direction of the Z-axis represents the bottom.
[0025] This utility model embodiment provides an electric injection displacement structure for an injection molding machine, combined with Figures 1 to 5 As shown, the device includes an injection mechanism 1, a mold-locking mechanism 2, an elastic element 3, and a first ball screw 4. The injection mechanism 1 is equipped with a first drive device 5 with a brake function. The first ball screw 4 includes a screw 41 and a screw nut 42. The screw nut 42 is sleeved on the screw 41 and moves axially along the screw 41. The first drive device 5 is connected to and drives the screw 41 to rotate. The mold-locking mechanism 2 is provided with a connecting rod 21. The end of the connecting rod 21 is provided with a limiting plate 22. The connecting rod 21 passes through the outer wall of the screw nut 42 and restricts the rotation of the screw nut 42. The two ends of the elastic element 3 abut against the screw nut 42 and the limiting plate 22, respectively.
[0026] When the lead screw 41 rotates in the forward direction, the lead screw nut 42 moves backward and presses the elastic element 3 to the limit position. Then, the lead screw nut 42 stops moving, and the lead screw 41 drives the injection mechanism 1 to move forward until it docks with the mold locking mechanism 2. When the docking is successful, the first drive device 5 uses a brake to lock the lead screw 41 so that the lead screw 41 cannot rotate, and the elastic element 3 restricts the injection mechanism 1 from moving backward.
[0027] like Figure 3 As shown, in this embodiment, the limiting plate 22 has a clearance hole in the middle for avoiding the lead screw 41, and the limiting plate 22 and the lead screw 41 are slidably connected. The positive direction is either clockwise or counterclockwise, and the reverse direction is the opposite of the positive direction.
[0028] like Figure 3 As shown, optionally, it also includes a movable plate 43, the lead screw nut 42 and the movable plate 43 are fixedly connected and drive the movable plate 43 to move, and the front and rear ends of the elastic member 3 abut against the movable plate 43 and the limiting plate 22 respectively.
[0029] In this embodiment, the lead screw nut 42 is fixed to the middle of the moving plate 43 by bolts. In other embodiments, the lead screw nut 42 and the moving plate 43 can be integrally formed.
[0030] like Figure 3 As shown, optionally, there are two connecting rods 21, both of which slide through the moving plate 43. The limiting plate 22 simultaneously fixes the two connecting rods 21. The connecting rods 21 and the moving plate 43 cooperate to restrict the rotation of the lead screw nut 42.
[0031] In this embodiment, the lead screw nut 42 is located between the two connecting rods 21. The two connecting rods 21 are slidably connected to the left and right ends of the moving plate 43, respectively.
[0032] like Figure 3 As shown, optionally, there are two elastic elements 3, each sleeved on one of the two connecting rods 21.
[0033] Optionally, the bottom of the injection mechanism 1 is provided with an injection base 11, and the lead screw 41 and the injection base 11 are rotatably connected by bearings.
[0034] like Figure 1 As shown, in this embodiment, two connecting rods 21 are slidably inserted through the front end of the injection base 11. The first driving device 5 is fixedly connected to the injection base 11 and moves synchronously with the injection base 11.
[0035] Optionally, the bottom of the injection base 11 is provided with a slide rail 12, and the injection base 11 is slidably connected to the slide rail 12.
[0036] like Figure 1 As shown, in this embodiment, there are two slide rails 12, which are fixed on the external worktable and respectively located at the bottom of the left and right ends of the injection base 11, so as to make the sliding structure more stable.
[0037] Optionally, the first drive device 5 is a three-phase geared motor, and the elastic element 3 is a mechanical spring. In this embodiment, the mechanical spring is a spring specifically designed for large machine tools, which is strong and not easily damaged.
[0038] Working principle:
[0039] When the first drive device 5 drives the lead screw 41 to rotate in the forward direction, the lead screw nut 42 moves backward to squeeze the elastic element 3. When the elastic element 3 is compressed to the limit, the lead screw nut 42 can no longer move backward. Because the connecting rod 21, the moving plate 43, and the injection base 11 cooperate to restrict the rotation of the lead screw nut 42, the lead screw 41 rotates while driving the injection base 11 to move forward until it docks with the mold locking mechanism 2.
[0040] Once the docking is successful, the first drive device 5 engages the brake to lock the lead screw 41, preventing it from rotating. When the injection mechanism 1 injects glue, factors such as injection impact or thermal expansion may cause the injection mechanism 1 to tend to move backward. At this time, since neither the lead screw 41 nor the lead screw nut 42 can rotate, the backward movement of the lead screw 41 will cause the lead screw nut 42 to move backward as well. However, the elastic element 3 remains in a compressed state, and the elastic force of the elastic element 3 pushes the lead screw nut 42 to tend to move forward, thereby compensating for the backward movement and maintaining the locking effect after docking.
[0041] Compared to existing technologies that rely on the output power of the drive mechanism to compensate for displacement and achieve a locking effect, this invention maintains the locking effect by using the elastic force of the elastic element 3 to push the injection mechanism 1 forward after successful docking. This not only saves energy, but also allows the elastic deformation of the elastic element 3 to absorb some of the impact force, preventing the first drive device 5 from directly bearing extreme loads and extending the motor's lifespan.
[0042] like Figure 4 As shown, optionally, the injection mechanism 1 includes an injection assembly 13, which includes a first driving wheel 131, a first driven wheel 132, a first synchronous belt 133, a second drive device 134, and a second ball screw. The output shaft of the second drive device 134 is connected to and drives the first driving wheel 131 to rotate. The first driving wheel 131 and the first driven wheel 132 are connected by the first synchronous belt 133. The first driven wheel 132 is connected to the second ball screw and provides power to the second ball screw. Specifically, the first driven wheel 132 is connected to the lead screw (not shown) of the second ball screw and drives the lead screw of the second ball screw to rotate.
[0043] like Figure 5 As shown, optionally, the injection mechanism 1 further includes a sol assembly 14, which includes a sol shaft, a second drive wheel 141, a second driven wheel 142, a second synchronous belt 143, and a third drive device 144. The third drive device 144 is connected to and drives the second drive wheel 141 to rotate. The second drive wheel 141 and the second driven wheel 142 are connected by the second synchronous belt 143. The second driven wheel 142 is connected to the sol shaft and drives the sol shaft to rotate.
[0044] Optionally, both the second drive device 134 and the third drive device 144 are permanent magnet servo motors. The injection assembly 13 and the solvent assembly 14 are both connected to the injection base 11 and move synchronously with the injection base 11.
[0045] In the prior art, a hydraulic power system is generally used in conjunction with a hydraulic cylinder as the power source for the injection assembly 13, and a hydraulic power system is used in conjunction with a hydraulic motor as the power source for the sol assembly 14. However, hydraulic oil has high heat generation and large heat loss.
[0046] In this embodiment, the first drive device 5, the second drive device 134 and the third drive device 144 all use motors. Compared with the prior art, they not only have high power output mechanical transmission efficiency, but also reduce heat loss and have higher control precision.
[0047] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.
[0048] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0049] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0050] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0051] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0052] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.
[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0054] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.
Claims
1. An electric injection displacement structure for an injection molding machine, characterized in that, The device includes a glue injection mechanism (1), a mold clamping mechanism (2), an elastic element (3), and a first ball screw (4). The glue injection mechanism (1) is equipped with a first drive device (5) with a brake function. The first ball screw (4) includes a screw rod (41) and a screw nut (42). The screw nut (42) is sleeved on the screw rod (41) and moves along the axial direction of the screw rod (41). The first drive device (5) is connected to and drives the screw rod (41) to rotate. The mold clamping mechanism (2) is provided with a connecting rod (21). The end of the connecting rod (21) is provided with a limiting plate (22). The connecting rod (21) passes through the outer wall of the screw nut (42) and restricts the rotation of the screw nut (42). The two ends of the elastic element (3) abut against the screw nut (42) and the limiting plate (22) respectively. When the lead screw (41) rotates in the forward direction, the lead screw nut (42) moves backward and squeezes the elastic element (3) to the limit position. After the lead screw nut (42) stops moving, the lead screw (41) drives the injection mechanism (1) to move forward until it docks with the mold locking mechanism (2). When the docking is successful, the first drive device (5) brakes and locks the lead screw (41) so that the lead screw (41) cannot rotate. The elastic element (3) restricts the injection mechanism (1) from moving backward.
2. The electric injection displacement structure of the injection molding machine according to claim 1, characterized in that, It also includes a movable plate (43), the lead screw nut (42) and the movable plate (43) are fixedly connected and drive the movable plate (43) to move, and the front and rear ends of the elastic member (3) abut against the movable plate (43) and the limiting plate (22) respectively.
3. The electric injection displacement structure of the injection molding machine according to claim 2, characterized in that, There are two connecting rods (21), both of which slide through the moving plate (43). The limiting plate (22) simultaneously fixes the two connecting rods (21). The connecting rods (21) and the moving plate (43) cooperate to restrict the rotation of the lead screw nut (42).
4. The electric injection displacement structure of the injection molding machine according to claim 3, characterized in that, There are two elastic elements (3), each sleeved on one of the two connecting rods (21).
5. The electric injection displacement structure of the injection molding machine according to claim 1, characterized in that, The bottom of the injection mechanism (1) is provided with an injection base (11), and the lead screw (41) and the injection base (11) are rotatably connected by bearings.
6. The electric injection displacement structure of the injection molding machine according to claim 5, characterized in that, The bottom of the injection base (11) is provided with a slide rail (12), and the injection base (11) is slidably connected to the slide rail (12).
7. The electric injection displacement structure of the injection molding machine according to claim 1, characterized in that, The first drive device (5) is a three-phase geared motor, and the elastic element (3) is a mechanical spring.
8. The electric injection displacement structure of the injection molding machine according to any one of claims 1-7, characterized in that, The glue injection mechanism (1) includes a glue injection assembly (13), which includes a first driving wheel (131), a first driven wheel (132), a first synchronous belt (133), a second drive device (134), and a second ball screw. The output shaft of the second drive device (134) is connected to and drives the first driving wheel (131) to rotate. The first driving wheel (131) and the first driven wheel (132) are connected by the first synchronous belt (133). The first driven wheel (132) is connected to the second ball screw and provides power to the second ball screw.
9. The electric injection displacement structure of the injection molding machine according to claim 8, characterized in that, The injection mechanism (1) further includes a sol assembly (14), which includes a sol shaft, a second drive wheel (141), a second driven wheel (142), a second synchronous belt (143), and a third drive device (144). The third drive device (144) is connected to and drives the second drive wheel (141) to rotate. The second drive wheel (141) and the second driven wheel (142) are connected by the second synchronous belt (143). The second driven wheel (142) is connected to the sol shaft and drives the sol shaft to rotate.
10. The electric injection displacement structure of the injection molding machine according to claim 9, characterized in that, Both the second drive device (134) and the third drive device (144) are permanent magnet servo motors.