A cutting device for EVA sheet

Abstract

This utility model relates to the field of cutting device technology, and more particularly to a cutting device for EVA sheets. It includes an operating table, with a support frame fixed above the operating table. The support frame has an L-shaped structure, and two symmetrically distributed pillars are fixed to the lower end of the support frame. The lower ends of the pillars are fixedly installed on the surface of the operating table. Several cylinders are fixedly inserted through the middle of the support frame. A piston rod is installed inside each cylinder, and a connecting plate is fixed to the lower end of the piston rod. An upper cutting blade is fixed at the center of the lower end of the connecting plate, and a lower cutting blade is fixed at the center of the operating table. This solution uses cylinders to drive the upper cutting blade and the fixed lower cutting blade to form a scissor structure, achieving fast and precise cutting. Simultaneously, symmetrically distributed pressure plates and a positioning table can clamp and position the rigid sheet. Cylinders drive the pressure plates downward to ensure the sheet is tensioned during cutting, preventing displacement and improving cutting accuracy and efficiency. It is particularly suitable for processing EVA sheets of different textures.

Description

Technical Field

[0001] This utility model relates to the field of cutting device technology, and in particular to a cutting device for EVA sheet. Background Technology

[0002] EVA sheets (ethylene-vinyl acetate copolymer sheets) typically have good softness and elasticity. The softness of this material can be adjusted according to its formulation and processing technology to meet different application requirements.

[0003] EVA sheets, due to their excellent performance and wide range of applications, have become an indispensable material in modern industry and daily life. For example, Chinese Patent Publication No. CN216781943U discloses a fixed-distance cutting device for EVA sheet production. This device includes a load-bearing frame with a cutting groove on its inner wall. A motor is mounted on the right wall of the load-bearing frame, and a reciprocating screw is installed at the motor's output end within the load-bearing frame. It also includes a sliding plate, one end of which is sleeved on the reciprocating screw, and the other end of which is sleeved on a positioning rod. A push plate is connected to the output end of a cylinder. A limit spring is connected to a limit rod at its bottom. A mounting block is embedded in the bottom of the push plate, and a cutting blade is fixedly mounted on its bottom. A fixing groove is formed in the bottom of the push plate, and a pull ring is connected to the fixing block via a pull rope. A fixing rod is fixedly mounted on the bottom of the push plate, and the fixing rod is located within the opening of the mounting block. This fixed-distance cutting device for EVA sheet production ensures the stability of the sheet during cutting and facilitates the replacement of the cutting blade.

[0004] Currently, when EVA sheets need to be cut, some sheets are thin and soft, so it is difficult to achieve a stable positioning of the cutting point by simply pressing the two ends together. At the same time, some sheets are large, and when leveling and aligning the cutting points, manual operation is time-consuming, labor-intensive, and prone to large errors. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing an EVA sheet cutting device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design an EVA sheet cutting device, including an operating table, a support frame fixed above the operating table, the support frame having an L-shaped structure, and two symmetrically distributed pillars fixed at the lower end of the support frame, the lower ends of the pillars being fixedly installed on the surface of the operating table.

[0008] Several cylinders are fixed through the middle of the support frame. A piston rod is installed inside the cylinder. A connecting plate is fixed to the lower end of the piston rod. An upper cutter is fixed at the center of the lower end of the connecting plate. A lower cutter is fixed at the center of the operating table. The upper cutter and the lower cutter are fitted together.

[0009] A cylinder two is also fixed through the upper end of the operating table. A piston rod two for extension and retraction is provided inside the cylinder two. A pressure plate one is fixed to the end of the piston rod two. The pressure plate one is symmetrically distributed along both sides of the upper cutter. A positioning platform is also fixed on the operating table. The positioning platform is symmetrically distributed along both sides of the lower cutter. The pressure plate one is positioned to match the positioning platform.

[0010] In detail, the lower end of the operating table is fixed with a bearing seat by a bracket, and a shaft is rotatably installed inside the bearing seat. The surface of the shaft is provided with two equally spaced threaded protrusions, and the two threaded protrusions distributed on both sides are arranged with opposite thread directions.

[0011] In detail, a motor is provided at the end of the shaft away from the shaft seat. The outer wall of the motor is fixed to the surface of the operating table by a bracket. The motor has a drive shaft inside, and the end of the shaft is fixedly connected to the end of the shaft by a coupling.

[0012] In detail, a threaded sleeve is installed on the surface of the threaded protrusion, and a limit platform is fixed to the upper end of the threaded sleeve by a bracket. A limit hole is opened on the surface of the operating table, and the limit platform and the inner wall surface of the limit hole are slidably and tightly attached.

[0013] In detail, the upper end of the limiting platform is provided with a positioning frame, and the bottom end of the inner wall of the positioning frame, the upper end face of the positioning platform and the upper end of the lower cutter are on the same horizontal plane.

[0014] In detail, the upper end of the positioning frame is fixedly penetrated by a cylinder three, and the cylinder three is equipped with a piston rod three for extension and retraction. The end of the piston rod three is fixed with a pressure plate two.

[0015] In detail, the limiting platform has an alignment groove inside, and an alignment block is fixed at the lower end of the positioning frame. The alignment block slides into and connects with the alignment groove.

[0016] In detail, the alignment block has pin grooves on both sides, and a locking pin is slidably sleeved inside the pin groove. The end of the locking pin has a curved structure. A spring is installed inside the pin groove. The two ends of the spring are fixedly assembled with the inner wall of the pin groove and the surface of the locking pin, respectively. An arc-shaped groove is opened on the inner wall of the alignment groove. The inner wall of the arc-shaped groove is an arc surface. The curved surface of the end of the locking pin is pressed against the inner arc surface of the arc-shaped groove.

[0017] The design scheme proposed in this utility model has the following beneficial effects in application:

[0018] 1. This solution uses cylinder one to drive the upper cutter and the fixed lower cutter to form a scissor structure, which enables fast and accurate cutting. At the same time, the symmetrically distributed pressure plate one and positioning table can clamp and position the rigid sheet. Cylinder two drives the pressure plate to press down to ensure that the sheet is tensioned during cutting, avoids displacement, and improves cutting accuracy and efficiency. It is especially suitable for processing EVA sheets of different textures.

[0019] 2. As described in 1, in response to the problem of easy deformation of soft EVA sheets, the device is designed with a bidirectional threaded shaft structure driven by a motor. The protrusions in opposite thread directions drive the two positioning frames to move in opposite directions, so as to achieve uniform tensioning of the sheet. Combined with the pressure plate clamping and fixing driven by the cylinder three, it ensures that the soft sheet remains flat during cutting, avoids wrinkles or deviation, and significantly improves the cutting quality.

[0020] 3. As described in 2, the positioning frame and the limiting platform adopt an insertion structure of alignment blocks and alignment slots, and are equipped with spring clips for quick locking. Disassembly and assembly can be completed without tools. This design not only facilitates the replacement or maintenance of the positioning frame, but also allows it to be directly removed when not needed or when it affects the spatial process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0022] Figure 2 This is a bottom view of the overall bottom of this utility model;

[0023] Figure 3 This is a schematic diagram of the overall side structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the installation of the alignment block and alignment groove of this utility model;

[0025] Figure 5 This is an enlarged schematic diagram of point A of this utility model.

[0026] In the diagram: 1. Operating table; 11. Support frame; 12. Column; 13. Cylinder 1; 14. Connecting plate; 15. Upper cutter; 16. Lower cutter; 17. Cylinder 2; 18. Pressure plate 1; 19. Positioning table; 2. Shaft seat; 21. Shaft rod; 22. Threaded protrusion; 23. Threaded sleeve; 24. Limiting platform; 25. Limiting hole; 26. Positioning frame; 27. Cylinder 3; 28. Pressure plate 2; 29. ​​Motor; 2001. Alignment block; 2002. Alignment groove; 2003. Pin groove; 2004. Locking pin; 2005. Spring; 2006. Arc groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figures 1-5 An EVA sheet cutting device includes an operating table 1, a support frame 11 fixed above the operating table 1, the support frame 11 having an L-shaped structure, and two symmetrically distributed pillars 12 fixed at the lower end of the support frame 11. The lower ends of the pillars 12 are fixedly installed on the surface of the operating table 1. Through the cooperation of the pillars 12, the support frame 11 can be stably supported.

[0029] Several cylinders 13 are fixed through the middle of the support frame 11. A piston rod is installed inside the cylinder 13. A connecting plate 14 is fixed to the lower end of the piston rod. An upper cutter 15 is fixed at the center of the lower end of the connecting plate 14. A lower cutter 16 is fixed at the center of the operating table 1. The upper cutter 15 and the lower cutter 16 are fitted together. When the sheet needs to be cut, the piston rod of the cylinder 13 extends, so that the upper cutter 15 and the lower cutter 16 form a scissor structure to cut the sheet.

[0030] A cylinder 17 is fixedly installed at the upper end of the operating table 1. A piston rod 2 for extension and retraction is installed inside the cylinder 17. A pressure plate 18 is fixed at the end of the piston rod 2. The pressure plate 18 is symmetrically distributed along both sides of the upper cutter 15. A positioning table 19 is also fixed on the operating table 1. The positioning table 19 is symmetrically distributed along both sides of the lower cutter 16. The pressure plate 18 and the positioning table 19 are positioned to fit together. The positioning table 19, together with the pressure plate 18, can directly clamp and position the two ends of a slightly harder sheet material. By extending the piston rod 2 of the cylinder 17, the pressure plate 18 can move downward to achieve compression positioning, thereby ensuring the cutting tension of the sheet material.

[0031] It should be further explained that the lower end of the operating table 1 is fixed with a bearing 2 by a bracket. The bearing 2 has a rotating shaft 21 inside. The surface of the shaft 21 is provided with two equally spaced threaded protrusions 22. The two threaded protrusions 22 distributed on both sides are arranged with opposite thread directions. Through the symmetrical arrangement of the two threaded protrusions 22, the two positioning frames 26 can move closer or further away from each other at the same time when they move, so as to stretch and tighten the relatively soft sheet material.

[0032] It should be further noted that a motor 29 is provided at the end of the shaft 21 away from the shaft seat 2. The outer wall of the motor 29 is fixed to the surface of the operating table 1 by a bracket. The motor 29 has a drive shaft inside. The end of the shaft is fixedly connected to the end of the shaft 21 by a coupling. The motor 29 is a stepper motor and has a forward and reverse switch connected to it by wires. The model of the forward and reverse switch is HY2-8.

[0033] It should be further explained that a threaded sleeve 23 is threadedly installed on the surface of the threaded protrusion 22. The upper end of the threaded sleeve 23 is fixed to a limiting platform 24 by a bracket. A limiting hole 25 is opened on the surface of the operating table 1. The limiting platform 24 is slidably attached to the inner wall of the limiting hole 25. By allowing the limiting platform 24 to slide within the limiting hole 25, it can be ensured that the positioning frame 26 can move horizontally and stably when the threaded sleeve 23 is driven.

[0034] It should be further noted that a positioning frame 26 is provided at the upper end of the limiting platform 24. The bottom end of the inner wall of the positioning frame 26, the upper end face of the positioning platform 19 and the upper end of the lower cutter 16 are on the same horizontal plane, ensuring that the sheet can be placed flat and stable as a whole.

[0035] It should be further explained that a cylinder 27 is fixedly inserted through the upper end of the positioning frame 26. The cylinder 27 has a piston rod 3 for extension and retraction inside. A pressure plate 28 is fixed to the end of the piston rod 3. By extending the piston rod 3 of the cylinder 27, the pressure plate 28 can cooperate with the bottom end of the positioning frame 26 to clamp and position the soft sheet material at both ends. At this time, the cutting point corresponds to the position of the cutter. The power of the motor 29 is turned on, and the motor 29 is started by the forward and reverse switch, so that the motor 29 can drive its shaft to rotate in both directions. This drives the shaft 21 to move together, and the threaded protrusion 22 can rotate together. In turn, the threaded sleeve 23 can move. By sliding the limiting table 24 in the limiting hole 25, the two positioning frames 26 can move in opposite directions or away from each other, realizing the tensioning operation when cutting the soft sheet material.

[0036] It should be further explained that the limiting platform 24 has an alignment groove 2002 inside, and the lower end of the positioning frame 26 is fixed with an alignment block 2001. The alignment block 2001 slides into and docks with the alignment groove 2002, which can realize the quick positioning and docking of the positioning frame 26 and the limiting platform 24.

[0037] It should be further noted that pin grooves 2003 are provided on both sides of the alignment block 2001. A retaining pin 2004 is slidably fitted inside the pin groove 2003. The end of the retaining pin 2004 has a curved surface structure. A spring 2005 is installed inside the pin groove 2003. The two ends of the spring 2005 are fixedly assembled with the inner wall surface of the pin groove 2003 and the surface of the retaining pin 2004, respectively. An arc-shaped groove 2006 is provided on the inner wall of the alignment groove 2002. The inner wall of the arc-shaped groove 2006 is an arc surface. The end curved surface of pin 2004 is pressed against the inner arc surface of arc groove 2006. When the positioning frame 26 needs to be removed, the positioning frame 26 is pulled upward to make the end curved surface of pin 2004 slide and press against the inner arc surface of arc groove 2006, allowing the compression spring 2005 of pin 2004 to enter the interior of pin groove 2003, thereby separating arc groove 2006, and then separating alignment block 2001 from alignment groove 2002, completing the disassembly of positioning frame 26.

[0038] Working method: When processing hard EVA sheets, the operator first lays the sheet flat on the surface of the positioning table 19, ensuring that its edge is aligned with the lower cutter 16. At this time, cylinder 2 17, as the core driving component, is activated, and its internal piston rod 2 extends downward, driving the symmetrically distributed pressure plate 1 18 to press down synchronously. The pressure plate 1 18 and the positioning table 19 form an upper and lower clamping structure. The clamping force can be precisely controlled by adjusting the air pressure of cylinder 2 17 to prevent the sheet from sliding or deforming. Since the hard material itself has high rigidity, only the two ends need to be fixed to maintain the flatness of the cutting area. Subsequently, the piston rod 1 of cylinder 1 13 pushes the connecting plate 14 down, so that the upper cutter 15 and the lower cutter 16 form a shearing action. The fit design of the two is similar to the scissor structure, ensuring that the cutting surface is smooth and burr-free.

[0039] For soft EVA sheets, a stretching positioning structure is required. The operator first inserts both ends of the sheet into the positioning frames 26 on both sides, and then starts the cylinder 27. Its piston rod drives the pressure plate 28 to press down, which clamps the sheet with the bottom surface of the positioning frame 26. The motor 29 is started by a forward and reverse switch, which drives the shaft 21 to rotate. Since the two threaded protrusions 22 on the shaft 21 are threads in opposite directions, the threaded sleeve 23 will move synchronously towards or away from each other when rotating. Through the sliding constraint of the limiting hole 25 and the limiting platform 24, the positioning frame 26 achieves horizontal directional displacement, thereby applying a uniform stretching force to the sheet. In the stretched state, the sheet is taut above the lower cutter 16. At this time, the cylinder 13 drives the upper cutter 15 to complete the cutting. This design effectively solves the problem of cutting wrinkles caused by the elasticity of soft materials, and the stepping characteristics of the motor 29 allow for precise control of the stretching distance, adapting to materials of different thicknesses.

[0040] When it is necessary to remove the positioning frame 26, by forcefully pulling the positioning frame 26 upward, the end curved surface of the locking pin 2004 slides and presses against the inner arc surface of the arc groove 2006, allowing the locking pin 2004 to compress the spring 2005 into the interior of the pin groove 2003, thereby separating the arc groove 2006, and then separating the alignment block 2001 from the alignment groove 2002, thus completing the disassembly of the positioning frame 26.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cutting device of EVA sheet material comprising an operating table (1), characterized in that: A support frame (11) is fixed above the operating table (1). The support frame (11) has an L-shaped structure. Two symmetrically distributed pillars (12) are fixed at the lower end of the support frame (11). The lower ends of the pillars (12) are fixedly installed on the surface of the operating table (1). A number of cylinders (13) are fixed through the middle of the support frame (11). A piston rod is provided inside the cylinder (13). A connecting plate (14) is fixed at the lower end of the piston rod. An upper cutter (15) is fixed at the center of the lower end of the connecting plate (14). A lower cutter (16) is fixed at the center of the operating table (1). The upper cutter (15) and the lower cutter (16) are fitted together. The upper end of the operating table (1) is also fixed with a cylinder two (17). The cylinder two (17) is equipped with a piston rod two for extension and retraction. The end of the piston rod two is fixed with a pressure plate one (18). The pressure plate one (18) is symmetrically distributed along both sides of the upper cutter (15). The operating table (1) is also fixed with a positioning table (19). The positioning table (19) is symmetrically distributed along both sides of the lower cutter (16). The pressure plate one (18) and the positioning table (19) are positioned to fit together.

2. The cutting device of EVA sheet material as claimed in claim 1, wherein: The lower end of the operating table (1) is fixed with a bearing seat (2) by a bracket. A shaft (21) is rotatably arranged inside the bearing seat (2). The surface of the shaft (21) is provided with two equally spaced threaded protrusions (22). The two threaded protrusions (22) distributed along both sides are arranged with opposite thread directions.

3. The cutting device of EVA sheet material as claimed in claim 2, wherein: A motor (29) is provided at the end of the shaft (21) away from the shaft seat (2). The outer wall of the motor (29) is fixed to the surface of the operating table (1) by a bracket. A drive shaft is provided inside the motor (29). The end of the drive shaft is fixedly connected to the end of the shaft (21) by a coupling.

4. The cutting device of EVA sheet material as claimed in claim 3, wherein: The threaded protrusion (22) is threaded with a threaded sleeve (23). The upper end of the threaded sleeve (23) is fixed with a limiting platform (24) by a bracket. A limiting hole (25) is opened on the surface of the operating table (1). The limiting platform (24) and the inner wall of the limiting hole (25) are slidably attached.

5. The cutting device of EVA sheet material as claimed in claim 4, wherein: The upper end of the limiting platform (24) is provided with a positioning frame (26), and the bottom end of the inner wall of the positioning frame (26), the upper end face of the positioning platform (19) and the upper end of the lower cutter (16) are on the same horizontal plane.

6. The cutting device of EVA sheet material as claimed in claim 5, wherein: The upper end of the positioning frame (26) is fixedly connected to a cylinder three (27), and the cylinder three (27) is provided with a piston rod three for telescopic movement. The end of the piston rod three is fixed with a pressure plate two (28).

7. The cutting device of EVA sheet material as claimed in claim 6, wherein: The limiting platform (24) has an alignment groove (2002) inside, and the lower end of the positioning frame (26) is fixed with an alignment block (2001). The alignment block (2001) and the alignment groove (2002) slide into and dock.

8. The cutting device of EVA sheet material as claimed in claim 7, wherein: The alignment block (2001) has pin grooves (2003) on both sides. A locking pin (2004) is slidably sleeved inside the pin groove (2003). The end of the locking pin (2004) is curved. A spring (2005) is installed inside the pin groove (2003). The two ends of the spring (2005) are fixedly assembled with the inner wall of the pin groove (2003) and the surface of the locking pin (2004), respectively. An arc groove (2006) is opened on the inner wall of the alignment groove (2002). The inner wall of the arc groove (2006) is arc-shaped. The end curved surface of the locking pin (2004) is pressed against the inner arc surface of the arc groove (2006).

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