Hot cutting mechanism of EVA material

Abstract

The utility model provides a kind of hot cutting mechanism of EVA material, including base, electric heating wire is arranged in U-shaped frame inner lower part position and is matched with upper cutting groove, limit sleeve is arranged in the side of U-shaped frame away from guide cover, end plate is arranged in the side of limit sleeve away from U-shaped frame, counterbore is inserted with hollow column, hollow column one end is connected and fixed with end plate, hollow column one end penetrates first horizontal hole, spring in compression state is set on hollow column, spring one end is inserted in counterbore, the side of end plate away from perforation is provided with round hole, pressing part is connected with end plate for limiting the position of electric heating wire one end, the utility model has the beneficial effects as follows: it provides convenience for the pressing bolt of later period dismantling electric heating wire one end position.

Description

Technical Field

[0001] This utility model relates to a heat-cutting mechanism for EVA material, belonging to the field of EVA material processing. Background Technology

[0002] EVA (ethylene-vinyl acetate copolymer), a thermoplastic material with good flexibility, impact resistance, and processability, is widely used in packaging, footwear, toys, and building materials. In the processing of EVA materials, "hot cutting" is a highly efficient molding and cutting process. By utilizing heat energy to locally melt and rapidly separate the material, it is more suitable for handling soft and easily deformable EVA products compared to traditional cold cutting. Electric heating wires, commonly used consumables in EVA hot cutting, have two rings at each end, forming fulcrums for connection to a fixed structure. One ring is connected to one end of a U-shaped frame via a pin, achieving a movable hinge; the other ring is fixed to the other end of the U-shaped frame via a clamping bolt and a compressed spring. Under the continuous action of the spring's rebound force, the electric heating wire remains taut, ensuring stable contact with the EVA material during hot cutting and preventing deviation in the cutting trajectory or uneven heat distribution due to slack.

[0003] The large amount of heat generated by the heating wire during operation is transferred to the clamping bolt through heat conduction. Prolonged exposure to high temperatures significantly accelerates the oxidation of the clamping bolt, easily forming a hard oxide layer or rust on its surface. This not only causes the oxide layer to fill the gap between the bolt and nut, but may also lead to corrosion and adhesion at the thread engagement points, making it extremely difficult to remove the clamping bolt when replacing the heating wire later—even with tools, it is difficult to loosen it smoothly, and forced removal may even cause the bolt to break or the threads to be damaged. This increases the complexity and time cost of consumable replacement, adversely affecting the continuity of hot cutting processes. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hot cutting mechanism for EVA material to solve the problems mentioned in the background technology. This utility model provides convenience for the later disassembly of the clamping bolt that restricts the position of one end of the electric heating wire.

[0005] To achieve the above objectives, this utility model provides a heat-cutting mechanism for EVA material, comprising:

[0006] The base has a guide cover installed on its upper surface to restrict EVA material. The guide cover has a U-shaped cross-section and an upper cutting groove is machined in the middle of the guide cover.

[0007] The U-shaped frame is installed at the movable end of the vertically arranged electric push rod;

[0008] An electric heating wire is positioned at the lower part of the U-shaped frame and mates with the upper cutting groove. Both ends of the electric heating wire are equipped with rings.

[0009] A limiting sleeve is provided on the side of the U-shaped frame away from the guide cover. The area of ​​the U-shaped frame near the limiting sleeve has a first horizontal hole. The first horizontal hole is arranged concentrically with the limiting sleeve. The side of the limiting sleeve away from the first horizontal hole is recessed to form a countersunk hole.

[0010] An end plate is set on the side of the limiting sleeve away from the U-shaped frame. A hollow column is inserted into the countersunk hole. One end of the hollow column is connected and fixed to the end plate. A through hole is opened in the area covered by the hollow column on the end plate. One end of the electric heating wire passes through the hollow column and the through hole. One end of the hollow column passes through the first horizontal hole. A spring in a compressed state is sleeved on the hollow column. One end of the spring is inserted into the countersunk hole. A round hole is opened on the side of the end plate away from the through hole.

[0011] The clamping element, connected to the end plate, is used to limit the position of one end of the electric heating wire.

[0012] Furthermore, the clamping element includes:

[0013] A clamping screw is inserted into a round hole. One end of the clamping screw is threaded with a clamping nut. The ring at one end of the electric heating wire is sleeved on the clamping screw.

[0014] A support ring is fitted onto the clamping screw, and the support ring is located on the side of the circular hole opposite to the clamping nut;

[0015] The short columns are provided in multiples, and the multiple short columns are installed in a ring at equal intervals on the side of the support ring facing the end plate, with the end of the short column away from the support ring contacting the end plate.

[0016] Furthermore, a pressure ring is provided between the clamping nut and the annulus at one end of the electric heating wire, and the pressure ring is sleeved on the clamping screw.

[0017] Furthermore, the outer surface of the short column has an elongated opening that penetrates the short column, and the elongated opening is arranged along the length of the short column.

[0018] Furthermore, a second horizontal hole is provided at the lower vertical part of the U-shaped frame away from the limiting sleeve. A connecting post is provided on the side of the second horizontal hole near the guide cover. An arc-shaped groove that matches the surface of the U-shaped frame is machined on the side of the connecting post away from the guide sleeve. A notch is machined on the end of the connecting post away from the arc-shaped groove. The ring at one end of the electric heating wire is installed in the notch by a pin. A threaded head is installed in the arc-shaped groove. The end of the threaded head away from the connecting post passes through the second horizontal hole and is threadedly connected to a wing nut.

[0019] Furthermore, the upper side of the limiting sleeve is provided with a connecting plate, which is connected to the U-shaped frame by bolts, and the upper end of the connecting plate is equipped with an ear plate for connecting the movable end of the electric push rod.

[0020] Furthermore, an L-shaped plate is provided on the side of the U-shaped frame away from the connecting plate. The lower end of the L-shaped plate is connected to the U-shaped frame by bolts. A vertically arranged guide hole is opened on the upper surface of the horizontal part of the L-shaped plate. A guide post is inserted into the guide hole. A positioning seat is installed on the upper end of the guide post. The positioning seat has an L-shaped structure. Two fixing holes are opened on the vertical part of the positioning seat.

[0021] Furthermore, a lower cutting groove is provided at the center of the upper surface of the base, and the lower cutting groove is aligned with the upper cutting groove.

[0022] The beneficial effects of this utility model are:

[0023] 1. Connect one end of the heating wire to one end of the U-shaped frame using the connecting post, threaded head, and wing nut. Then, pass the other end of the heating wire through the hollow post and the hole. Use the clamping screw and clamping nut to keep the relative position of one end of the heating wire and the end plate unchanged. At this time, the spring is in a compressed state. Under the action of the spring's rebound force, the heating wire is in a taut state.

[0024] 2. When using the fasteners formed by the clamping screw and clamping nut to restrict the relative position of the electric heating wire and the end plate, a structure consisting of a support ring and a short post is set between the head of the clamping screw and the round hole, and the support ring is fitted onto the clamping screw. Under the support of the structure formed by the short post and the support ring, there is a gap between the head of the clamping screw and the end plate. When the fasteners formed by the clamping screw and clamping nut cannot be separated normally due to oxidation and corrosion, the short post and the clamping screw can be cut off using the space between the support ring and the end plate. This reduces the operational difficulty when replacing the electric heating wire and saves maintenance time. Attached Figure Description

[0025] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of a heat-cutting mechanism for EVA material according to this utility model;

[0027] Figure 2 This is another perspective view of the heat-cutting mechanism for EVA material according to this utility model;

[0028] Figure 3 This is a partially exploded structural diagram of a thermal cutting mechanism for EVA material according to this utility model;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] In the picture:

[0031] 1. Base; 11. Guide cover; 12. Lower cutting groove; 13. Upper cutting groove;

[0032] 2. U-shaped frame;

[0033] 3. End plate; 31. Spring; 32. Round hole; 33. Through hole; 34. Hollow column;

[0034] 4. Limiting sleeve;

[0035] 5. Electric heating wire; 51. Ring;

[0036] 6. Connecting plate; 61. Ear plate;

[0037] 7. Guide column; 71. L-shaped plate; 72. Positioning seat;

[0038] 8. Connecting post; 81. Threaded head; 82. Wing nut;

[0039] 9. Tightening screw; 91. Support ring; 92. Tightening nut; 93. Pressure ring; 94. Short post. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0041] Please see Figures 1-3 This utility model provides a technical solution: a hot cutting mechanism for EVA material, including a base 1, a guide cover 11 for restricting the EVA material is installed on the upper surface of the base 1, the guide cover 11 has a "U" shaped cross-section, an upper cutting groove 13 is processed in the middle of the guide cover 11, and a lower cutting groove 12 is opened in the middle of the upper surface of the base 1. The lower cutting groove 12 is aligned with the upper cutting groove 13. The lower cutting groove 12 and the upper cutting groove 13 provide moving space for the electric heating wire 5. The space formed by the guide cover 11 and the base 1 restricts the movement trajectory of the EVA material.

[0042] See Figure 1 and Figure 2The U-shaped frame 2 is installed on the movable end of the vertically arranged electric push rod. The upper side of the limiting sleeve 4 is provided with a connecting plate 6, which is connected to the U-shaped frame 2 by bolts. The upper end of the connecting plate 6 is provided with an ear plate 61 for connecting the movable end of the electric push rod. The side of the U-shaped frame 2 away from the connecting plate 6 is provided with an L-shaped plate 71. The lower end of the L-shaped plate 71 is connected to the U-shaped frame 2 by bolts. The upper surface of the horizontal part of the L-shaped plate 71 is provided with a vertically arranged guide hole. A guide post 7 is inserted into the guide hole. A positioning seat 72 is installed on the upper end of the guide post 7. The positioning seat 72 is an L-shaped structure. The vertical part of the positioning seat 72 is provided with two fixing holes. During the extension and retraction of the electric push rod, the U-shaped frame 2 is driven to move up and down. At this time, the guide post 7 slides relative to the L-shaped plate 71 in the guide hole, thereby limiting the movement trajectory of the U-shaped frame 2.

[0043] See Figures 1-3 The electric heating wire 5 is located in the lower part of the U-shaped frame 2 and cooperates with the upper cutting groove 13. Both ends of the electric heating wire 5 are equipped with rings 51. The lower part of the vertical part of the U-shaped frame 2 away from the limiting sleeve 4 is provided with a second horizontal hole. A connecting post 8 is provided on the side of the second horizontal hole near the guide cover 11. The side of the connecting post 8 away from the guide cover 11 is machined with an arc groove that cooperates with the surface of the U-shaped frame 2. The end of the connecting post 8 away from the arc groove is machined with a notch. The ring 51 at one end of the electric heating wire 5 is installed in the notch by a pin. A threaded head 81 is installed in the arc groove. The end of the threaded head 81 away from the connecting post 8 passes through the second horizontal hole and is threaded with a wing nut 82. The connecting post 8, the threaded head 81 and the wing nut 82 cooperate with each other to limit the relative position of one end of the electric heating wire 5 and one end of the U-shaped frame 2.

[0044] See Figures 1-4 The limiting sleeve 4 is located on the side of the U-shaped frame 2 away from the guide cover 11. A first horizontal hole is opened in the area of ​​the U-shaped frame 2 near the limiting sleeve 4. The first horizontal hole is concentrically arranged with the limiting sleeve 4. The side of the limiting sleeve 4 away from the first horizontal hole is recessed to form a countersunk hole. The end plate 3 is located on the side of the limiting sleeve 4 away from the U-shaped frame 2. A hollow column 34 is inserted into the countersunk hole. One end of the hollow column 34 is connected and fixed to the end plate 3. A through hole 33 is opened in the area of ​​the end plate 3 covered by the hollow column 34. One end of the electric heating wire 5 passes through the hollow column 34 and the through hole 33. The other end of the hollow column 34 passes through... A spring 31 in a compressed state is fitted on the hollow column 34 through the first horizontal hole. One end of the spring 31 is inserted into the countersunk hole. A round hole 32 is opened on the side of the end plate 3 away from the through hole 33. The connection of one end of the electric heating wire 5 is achieved through the cooperation of the connecting column 8, the threaded head 81 and the wing nut 82: the threaded head 81 on the connecting column 8 passes through the second horizontal hole of the U-shaped frame 2 and is threadedly connected to the wing nut 82, fixing the ring 51 of one end of the electric heating wire 5 at the notch of the connecting column 8, thereby forming a stable connection between one end of the electric heating wire 5 and one end of the U-shaped frame 2.

[0045] The other end of the heating wire 5 passes through the hollow column 34 and the through hole 33 on the end plate 3 in sequence, and is then fixed by the cooperation of the clamping screw 9 and the clamping nut 92. The ring 51 at the other end of the heating wire 5 is placed on the clamping screw 9, and the clamping nut 92 is tightened to make it fit tightly against the end plate 3, thereby keeping the relative position of this end of the heating wire 5 and the end plate 3 fixed. At this time, the spring 31 on the hollow column 34 is in a compressed state. Under the continuous action of its rebound force, the heating wire 5 is naturally tightened, ensuring that it remains taut at all times during the hot cutting process.

[0046] See Figures 1-4 A clamping screw 9 is inserted into a circular hole 32. A clamping nut 92 is threaded onto one end of the clamping screw 9. A circular ring 51 at one end of the electric heating wire 5 is fitted onto the clamping screw 9. A support ring 91 is fitted onto the clamping screw 9 and is positioned on the side of the circular hole 32 away from the clamping nut 92. Multiple short posts 94 are arranged in a ring at equal intervals on the side of the support ring 91 facing the end plate 3. The ends of the short posts 94 away from the support ring 91 contact the end plate 3. A clamping nut 92 is positioned between the clamping nut 92 and the circular ring 51 at one end of the electric heating wire 5. A pressure ring 93 is fitted onto the clamping screw 9, increasing the contact area between the clamping nut 92 and the ring 51. A long oval opening is formed on the outer surface of the short post 94, extending along its length. This design reduces the workload of sawing the short post 94. When the fasteners consisting of the clamping screw 9 and the clamping nut 92 restrict the relative position of the heating wire 5 and the end plate 3, an assembly consisting of a support ring 91 and short posts 94 is placed between the head of the clamping screw 9 and the circular hole 32 of the end plate 3. The support ring 91 is fitted onto the clamping screw 9, and multiple short posts 94 are evenly distributed on the side of the support ring 91 facing the end plate 3, with the end of each short post 94 away from the support ring 91 contacting the end plate 3. Thus, under the combined support of the short posts 94 and the support ring 91, a certain gap is formed between the head of the clamping screw 9 and the end plate 3.

[0047] When the clamping screw 9 and clamping nut 92 become oxidized and corroded due to long-term use and cannot be properly unscrewed, the operator can use the space between the support ring 91 and the end plate 3 to cut off the short column 94 and the clamping screw 9. This design avoids the predicament of being difficult to disassemble due to the fasteners being corroded and stuck together, significantly reduces the operational complexity when replacing the electric heating wire 5, and effectively saves equipment maintenance time.

[0048] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hot-cutting mechanism for EVA material, characterized in that, include: The base (1) has a guide cover (11) for limiting EVA material installed on its upper surface. The guide cover (11) has a "U" shaped cross section and an upper cutting groove (13) is machined in the middle of the guide cover (11). U-shaped frame (2), which is installed at the movable end of the vertically arranged electric push rod; An electric heating wire (5) is set in the lower part of the U-shaped frame (2) and cooperates with the upper cutting groove (13). Both ends of the electric heating wire (5) are equipped with rings (51). The limiting sleeve (4) is set on the side of the U-shaped frame (2) away from the guide cover (11). The area of ​​the U-shaped frame (2) near the limiting sleeve (4) is provided with a first horizontal hole. The first horizontal hole is arranged concentrically with the limiting sleeve (4). The side of the limiting sleeve (4) away from the first horizontal hole is recessed to form a countersunk hole. An end plate (3) is set on the side of the limiting sleeve (4) away from the U-shaped frame (2). A hollow column (34) is inserted into the countersunk hole. One end of the hollow column (34) is connected and fixed to the end plate (3). A through hole (33) is opened in the area of ​​the end plate (3) covered by the hollow column (34). One end of the electric heating wire (5) passes through the hollow column (34) and the through hole (33). One end of the hollow column (34) passes through the first horizontal hole. A spring (31) in a compressed state is sleeved on the hollow column (34). One end of the spring (31) is inserted into the countersunk hole. A round hole (32) is opened on the side of the end plate (3) away from the through hole (33). The clamping element is connected to the end plate (3) to limit the position of one end of the electric heating wire (5).

2. The heat-cutting mechanism for EVA material according to claim 1, characterized in that: The clamping element includes: A clamping screw (9) is inserted into a round hole (32). One end of the clamping screw (9) is threaded with a clamping nut (92). The ring (51) at one end of the electric heating wire (5) is sleeved on the clamping screw (9). A support ring (91) is sleeved on the clamping screw (9), and the support ring (91) is located on the side of the round hole (32) away from the clamping nut (92); Short columns (94) are provided in multiples. The multiple short columns (94) are installed in a ring at equal intervals on the side of the support ring (91) facing the end plate (3). The end of the short column (94) away from the support ring (91) is in contact with the end plate (3).

3. The heat-cutting mechanism for EVA material according to claim 2, characterized in that: A pressure ring (93) is provided between the clamping nut (92) and the ring (51) at one end of the electric heating wire (5), and the pressure ring (93) is sleeved on the clamping screw (9).

4. The heat-cutting mechanism for EVA material according to claim 2, characterized in that: The outer surface of the short column (94) is provided with an elongated opening that penetrates the short column (94), and the elongated opening is arranged along the length direction of the short column (94).

5. The heat-cutting mechanism for EVA material according to claim 1, characterized in that: The U-shaped frame (2) has a second horizontal hole at the lower part of the vertical part away from the limiting sleeve (4). A connecting post (8) is provided on the side of the second horizontal hole near the guide cover (11). The side of the connecting post (8) away from the guide cover (11) is machined with an arc groove that matches the surface of the U-shaped frame (2). A notch is machined at the end of the connecting post (8) away from the arc groove. The ring (51) at one end of the electric heating wire (5) is installed in the notch by a pin. A threaded head (81) is installed in the arc groove. The end of the threaded head (81) away from the connecting post (8) passes through the second horizontal hole and is threaded with a wing nut (82).

6. The heat-cutting mechanism for EVA material according to claim 1, characterized in that: The upper side of the limiting sleeve (4) is provided with a connecting plate (6), which is connected to the U-shaped frame (2) by bolts. The upper end of the connecting plate (6) is equipped with an ear plate (61) for connecting the movable end of the electric push rod.

7. The heat-cutting mechanism for EVA material according to claim 6, characterized in that: The U-shaped frame (2) has an L-shaped plate (71) on the side away from the connecting plate (6). The lower end of the L-shaped plate (71) is connected to the U-shaped frame (2) by bolts. The upper surface of the horizontal part of the L-shaped plate (71) has a vertically arranged guide hole. A guide post (7) is inserted in the guide hole. A positioning seat (72) is installed on the upper end of the guide post (7). The positioning seat (72) has an L-shaped structure. The vertical part of the positioning seat (72) has two fixing holes.

8. The heat-cutting mechanism for EVA material according to claim 1, characterized in that: The base (1) has a lower cutting groove (12) at the middle of its upper surface, and the lower cutting groove (12) is aligned with the upper cutting groove (13).

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