Automatic winding machine for EVA (Ethylene Vinyl Acetate)
By using a clamping assembly to position the core in the EVA automatic winding machine, the problem of core misalignment caused by lack of positioning of the rotating shaft is solved, and high-quality EVA winding is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-07
AI Technical Summary
In the current EVA production process, the lack of a positioning device on the rotating shaft causes the core to easily shift during replacement, affecting the winding quality.
An automatic EVA winding machine was designed, employing a clamping assembly including a bidirectional lead screw, a support bushing, first and second clamping frames, and an arc spring. The positioning and clamping of the core are achieved by rotating the bidirectional lead screw, ensuring that the center of the core coincides with the center of the bidirectional lead screw and preventing displacement.
It effectively prevents the core from shifting position during the winding process, improving the quality and consistency of EVA winding.
Smart Images
Figure CN224091259U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of winding machine technology, specifically an EVA automatic winding machine. Background Technology
[0002] EVA, or ethylene-vinyl acetate copolymer, is a general-purpose polymer. Due to its good flexibility, impact resistance, filler compatibility, and heat-sealing properties, EVA is widely used in foamed shoe materials, functional greenhouse films, packaging films, hot melt adhesives, wires and cables, and toys. The production process of EVA requires an automatic winding machine for winding.
[0003] In current technology, after EVA is discharged, it is wound around a core fixed on a rotating shaft and rotates with the rotating shaft to achieve the EVA winding process. Common rotating shafts achieve winding and unwinding of the core by inward or outward expansion of their own support plates. When the core is replaced, since there is no corresponding positioning device on the rotating shaft, the winding position of the EVA outside the core may be offset, affecting its winding quality.
[0004] Therefore, an automatic EVA winding machine is proposed to address the above problems. Utility Model Content
[0005] To address the shortcomings of existing technologies and solve the problem that common rotating shafts use their own support plates to retract or expand the core, which can cause the EVA core to shift during winding and affect its winding quality when the core is replaced due to the lack of a corresponding positioning device on the rotating shaft, an automatic EVA winding machine is proposed.
[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: An EVA automatic winding machine of this utility model includes a base, a mounting plate vertically fixed to the top of the base, a rotating circular plate clamped between the circular grooves on the side walls of the mounting plate, and multiple arc-shaped plates vertically fixed to the side walls of the rotating circular plate. These arc-shaped plates are arranged in an equally spaced array along the outer periphery of the rotating circular plate. Limiting strips are fixed between the arc-shaped inner walls of the arc-shaped plates via brackets. A clamping assembly is provided between the multiple arc-shaped plates. The clamping assembly includes a bidirectional lead screw, one end of which is fixed to the center of the side wall of the rotating circular plate via a bearing, and the other end of which is fixed to a fixed circular plate via a bearing. The fixed circular plate is fixed between one end of each of the multiple arc-shaped plates. Supporting bushings are symmetrically screwed onto the external threads of the bidirectional lead screw, and the outer wall grooves of the supporting bushings slide and engage with the multiple limiting strips.
[0007] Preferably, one of the supporting bushings has a plurality of first clamping frames vertically fixed to its outer wall, and the other supporting bushing has a plurality of second clamping frames hinged between the grooves on its outer wall. An arc-shaped spring is fixed between the second clamping frames and the grooves of the supporting bushing. The first clamping frames and the second clamping frames are respectively located between the gaps of the plurality of arc-shaped plates.
[0008] Preferably, a plurality of unloading top rods are vertically fixed to the side wall of the fixed circular plate, and one end of each of the plurality of unloading top rods can contact the side wall of a plurality of second clamping frames.
[0009] Preferably, a ring gear is fixed to the side wall of the rotating circular plate.
[0010] Preferably, a first motor is fixedly connected to the lower side wall of the mounting plate via a bracket, and an output gear is fixedly connected to the outer wall of the output shaft of the first motor, the output gear meshing with a ring gear.
[0011] Preferably, a lead screw shaft is installed at the center of the side wall of the rotating circular plate. One end of the lead screw shaft passes through the rotating circular plate and is fixedly connected to the axis of the bidirectional lead screw. The other end of the lead screw shaft is fixedly connected to a first sprocket.
[0012] Preferably, a second motor is fixedly connected to the upper side wall of the mounting plate.
[0013] Preferably, a second sprocket is fixed to the outer wall of the output shaft of the second motor, and a chain is installed between the second sprocket and the first sprocket.
[0014] The beneficial effects of this utility model are:
[0015] In this invention, the clamping assembly is installed through the cooperation between the outer arc plate of the rotating circular plate and the limiting strip plate. During the rotation of the bidirectional screw, the two supporting bushings can move closer or further apart to achieve the clamping, positioning, and unloading functions of the first and second clamping frames for the core. As the first and second clamping frames approach each other and squeeze the two ends of the core, they not only clamp and fix cores with different relative lengths and inner diameters within a certain range, but also ensure that the center position of the core is always aligned with the cross-section of the bidirectional screw after being clamped, preventing the winding position from shifting and increasing the winding quality of the EVA. Attached Figure Description
[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0017] Figure 1 This is a perspective view of the present invention;
[0018] Figure 2 This is a perspective view of the base and mounting plate in this utility model;
[0019] Figure 3 This is a three-dimensional view of a partially disassembled rotating circular plate in this utility model;
[0020] Figure 4 This is a perspective view of the clamping component in this utility model;
[0021] Legend:
[0022] 1. Base; 11. Mounting vertical plate; 2. Rotating circular plate; 21. Arc plate; 22. Limiting strip plate; 3. Clamping assembly; 31. Bidirectional lead screw; 32. Fixed circular plate; 33. Support bushing; 331. First clamping frame; 332. Second clamping frame; 333. Arc spring; 321. Unloading top rod; 23. Ring gear; 4. First motor; 41. Output gear; 34. Lead screw shaft; 341. First sprocket; 5. Second motor; 51. Second sprocket; 6. Chain. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] Specific implementation examples are given below.
[0025] Please see Figure 1 - Figure 4This utility model provides an automatic EVA winding machine, including a base 1. A mounting plate 11 is vertically fixed to the top of the base 1. A rotating circular plate 2 is fitted between the circular grooves on the side walls of the mounting plate 11. Multiple arc-shaped plates 21 are vertically fixed to the side walls of the rotating circular plate 2, and these arc-shaped plates 21 are arranged in an equally spaced array along the outer periphery of the rotating circular plate 2. Limiting strips 22 are fixed between the arc-shaped inner walls of the arc-shaped plates 21 via brackets. A clamping assembly 3 is provided between the multiple arc-shaped plates 21. The clamping assembly 3 includes a bidirectional lead screw 31, one end of which is fixed to the center of the side wall of the rotating circular plate 2 via a bearing. A fixed circular plate 32 is fixedly connected to the other end of the lead screw 31 via a bearing. The fixed circular plate 32 is fixed between one end of multiple arc-shaped plates 21. Support sleeves 33 are symmetrically threaded onto the external threads of the bidirectional lead screw 31. The grooves on the outer walls of the support sleeves 33 slide and engage with multiple limiting plates 22. Multiple first clamping frames 331 are vertically fixed to the outer wall of one support sleeve 33. Multiple second clamping frames 332 are hinged between the grooves on the outer walls of another support sleeve 33. An arc-shaped spring 333 is fixed between the second clamping frames 332 and the grooves of the support sleeve 33. The first clamping frames 331 and the second clamping frames 331... The rotating circular plate 2, located between the gaps of multiple arc-shaped plates 21 and clamped to the side wall of the mounting vertical plate 11, installs the clamping assembly 3 through the mutual cooperation between the arc-shaped plates 21 and the limiting strip 22. This ensures that the overall axis of the clamping assembly 3 is parallel to the base 1. When the core is inserted between the first clamping frame 331 and the second clamping frame 332, the rotating bidirectional screw 31 controls the two supporting bushings 33 to move closer to each other. The core is clamped and fixed through the mutual cooperation between the inclined walls and notches between the first clamping frame 331 and the second clamping frame 332, ensuring that the center of the core remains fixed after it is fixed. The EVA is kept in the middle position outside the core during the rotation of the core, rotating disc 2, and clamping assembly 3, and is aligned with the center of the double-acting screw 31. During the insertion and installation of the core, the core pressed against the second clamping frame 332 can overcome the elastic force of the arc spring 333, allowing the second clamping frame 332 to be hidden in the outer groove of the support bushing 33. After the core is installed, the second clamping frame 332 is reset under the elastic force of the arc spring 333, so that it can cooperate with the first clamping frame 331 to clamp and position the core.
[0026] like Figure 4As shown, a plurality of unloading top rods 321 are vertically fixed to the side wall of the fixed circular plate 32. One end of each of the multiple unloading top rods 321 can contact the side wall of a plurality of second clamping frames 332. During the unloading process, the bidirectional lead screw 31 is reversed, and the support bushing 33 of the second clamping frame 332 gradually approaches the fixed circular plate 32 and the unloading top rods 321. Under their compression, the elastic force of the arc spring 333 is overcome until the second clamping frame 332 deflects to the extent that the drum can be disengaged from the device, and then the unloading step is realized.
[0027] like Figure 2 and Figure 3 As shown, a ring gear 23 is fixedly connected to the side wall of the rotating circular plate 2. A first motor 4 is fixedly connected to the lower side wall of the mounting vertical plate 11 via a bracket. An output gear 41 is fixedly connected to the outer wall of the output shaft of the first motor 4. The output gear 41 meshes with the ring gear 23. The first motor 4 provides power for the overall rotation of the rotating circular plate 2 and the clamping assembly 3 through the meshing between the output gear 41 and the ring gear 23 to realize the winding of EVA outside the drum.
[0028] like Figure 2 and Figure 4 As shown, a lead screw shaft 34 is installed at the center of the side wall of the rotating circular plate 2. One end of the lead screw shaft 34 passes through the rotating circular plate 2 and is fixedly connected to the axis of the bidirectional lead screw 31. The other end of the lead screw shaft 34 is fixedly connected to a first sprocket 341. A second motor 5 is fixedly connected to the upper side wall of the mounting vertical plate 11. A second sprocket 51 is fixedly connected to the outer wall of the output shaft of the second motor 5. A chain 6 is installed between the second sprocket 51 and the first sprocket 341, which can rotate synchronously with the lead screw shaft 34 of the bidirectional lead screw 31. The first sprocket 341 is installed at one end of the lead screw shaft 34. Under the transmission force of the chain 6, the first sprocket 341 and the second sprocket 51 can rotate synchronously, thereby enabling the second motor 5 to provide rotational output force for the rotation of the bidirectional lead screw 31. During the overall rotation of the rotating circular plate 2, the clamping assembly 3, and the drum, the second motor 5 and the bidirectional lead screw 31 remain relatively stationary to prevent the clamping state of the clamping assembly 3 on the drum from being affected.
[0029] Working principle: The rotating circular plate 2, which is clamped on the side wall of the mounting vertical plate 11, installs the clamping assembly 3 through the mutual cooperation between the arc plate 21 and the limiting strip 22. This makes the overall axis of the clamping assembly 3 parallel to the base 1. When the core is inserted between the first clamping frame 331 and the second clamping frame 332, the rotating bidirectional screw 31 controls the two support bushings 33 to move closer to each other. The core is clamped and fixed by the mutual cooperation between the inclined walls and notches between the first clamping frame 331 and the second clamping frame 332, so that the core is... After fixing, its center can remain aligned with the center of the bidirectional lead screw 31. Furthermore, during the subsequent rotation of the core, rotating disc 2, and clamping assembly 3, it ensures that the EVA remains wound around the center of the core. During the insertion and installation of the core, the core pressed against the second clamping frame 332 overcomes the elastic force of the arc spring 333, allowing the second clamping frame 332 to be hidden within the outer groove of the support sleeve 33. After the core installation is complete, the elastic force of the arc spring 333 causes the second clamping frame 332 to... 32 is reset so that it can cooperate with the first clamping frame 331 to clamp and position the core. During the unloading process, the bidirectional lead screw 31 is reversed, and the support bushing 33 of the second clamping frame 332 gradually approaches the fixed circular plate 32 and the unloading top rod 321. Under their compression, it overcomes the elastic force of the arc spring 333 until the second clamping frame 332 deflects to the point that the drum can disengage from the device, and then the unloading step is realized. The first motor 4 rotates the circular plate 2 through the meshing between the output gear 41 and the ring gear 23. The clamping assembly 3 rotates as a whole to provide power for winding the EVA outside the drum. It can rotate synchronously with the screw shaft 34 of the bidirectional screw 31. The first sprocket 341 is installed at one end of the screw shaft 34. Under the transmission force of the chain 6, the first sprocket 341 and the second sprocket 51 can rotate synchronously, thereby enabling the second motor 5 to provide rotational output force for the rotation of the bidirectional screw 31. During the rotation of the rotating disc 2, the clamping assembly 3 and the drum as a whole, the second motor 5 and the bidirectional screw 31 remain relatively stationary.
[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. An automatic EVA winding machine, comprising a base (1), wherein a mounting plate (11) is vertically fixed to the top of the base (1), characterized in that: A rotating circular plate (2) is fitted between the circular grooves on the side wall of the mounting vertical plate (11). A plurality of arc-shaped plates (21) are vertically fixed to the side wall of the rotating circular plate (2). The plurality of arc-shaped plates (21) are arranged in an equally bisected array along the outer periphery of the rotating circular plate (2). Limiting strips (22) are fixed between the arc-shaped inner walls of the arc-shaped plates (21) by a bracket. A clamping assembly (3) is provided between the plurality of arc-shaped plates (21). The clamping assembly (3) includes a bidirectional lead screw. (31) One end of the bidirectional lead screw (31) is fixed to the center of the side wall of the rotating circular plate (2) through a bearing, and the other end of the bidirectional lead screw (31) is fixed to a fixed circular plate (32) through a bearing. The fixed circular plate (32) is fixed between one end of a plurality of arc plates (21). The external thread of the bidirectional lead screw (31) is symmetrically screwed with a support bushing (33). The groove on the outer wall of the support bushing (33) slides and fits with a plurality of limiting strips (22).
2. The EVA automatic winding machine according to claim 1, characterized in that: One of the support bushings (33) has a plurality of first clamping frames (331) vertically fixed to its outer wall, and another support bushing (33) has a plurality of second clamping frames (332) hinged between the grooves on its outer wall. An arc spring (333) is fixed between the second clamping frame (332) and the groove of the support bushing (33). The first clamping frames (331) and the second clamping frames (332) are respectively located between the gaps of the plurality of arc plates (21).
3. An automatic EVA winding machine according to claim 2, characterized in that: The side wall of the fixed circular plate (32) is vertically fixed with a plurality of unloading top rods (321), and one end of the plurality of unloading top rods (321) can respectively contact the side wall of a plurality of second clamping frames (332).
4. An automatic EVA winding machine according to claim 3, characterized in that: The rotating circular plate (2) has a ring gear (23) fixedly connected to its side wall.
5. An automatic EVA winding machine according to claim 4, characterized in that: A first motor (4) is fixedly connected to the lower side wall of the mounting plate (11) via a bracket. An output gear (41) is fixedly connected to the outer wall of the output shaft of the first motor (4). The output gear (41) meshes with the ring gear (23).
6. An automatic EVA winding machine according to claim 5, characterized in that: A lead screw shaft (34) is installed at the center of the side wall of the rotating circular plate (2). One end of the lead screw shaft (34) passes through the rotating circular plate (2) and is fixedly connected to the axis of the bidirectional lead screw (31). The other end of the lead screw shaft (34) is fixedly connected to a first sprocket (341).
7. An automatic EVA winding machine according to claim 6, characterized in that: A second motor (5) is fixedly connected to the upper side wall of the mounting plate (11).
8. An automatic EVA winding machine according to claim 7, characterized in that: A second sprocket (51) is fixed to the outer wall of the output shaft of the second motor (5), and a chain (6) is installed between the second sprocket (51) and the first sprocket (341).