Plastic plate forming device

Abstract

The invention provides a plastic plate forming device, and relates to the field of plastic plate processing devices. The plastic plate forming device comprises a machining table, a U-shaped frame and a shaping frame, a first mounting cavity is formed in the middle of the outer wall of the front end of the machining table, an air pump is arranged at the front end of the bottom face in the first mounting cavity, an air inlet of the air pump is fixedly connected with an air inlet pipe, and the lower end of the air inlet pipe is fixedly connected with a pipe frame; the lower ends of the U-shaped frames are fixedly connected with the machining table, and the plastic plate workpiece can be conveniently machined and formed through the dual modes of plastic suction and mold pressure application by means of cooperative use of the movable shaping frame carrying the plastic plate workpiece, the forming mold and the air pump provided with the air inlet pipe and the pipe frame. The plastic plate workpiece is prevented from being excessively stretched or compressed at the bending position of the mold, and then a stress concentration area is formed, so that the strength of the plastic plate workpiece at the bending position of the mold is improved, and the quality of a plastic plate machined and formed product is improved.

Description

Technical Field

[0001] The invention relates to the field of plastic plate processing devices, in particular to a plastic plate forming device. Background Art

[0002] Plastic plate forming device, as a key equipment for processing plastic plates into products of specific shapes, is not only widely used in plastic packaging, lighting, advertising, decoration and other industries, but also has become an indispensable tool in modern manufacturing industry due to its wide material adaptability, strong process diversity, high degree of automation, environmental protection and energy saving.

[0003] However, most of the existing plastic plate forming devices on the market are not convenient for workers to disassemble and install plastic plates, which causes workers to spend more time and energy in disassembling and installing plastic plates, which not only reduces production efficiency, but also increases labor costs and equipment maintenance costs. In addition, most of the existing plastic plate forming devices use suction molding or blow molding to process and shape plastic plates, which can easily cause the plastic plates to be over-stretched or compressed at the bends of the mold, thereby forming stress concentration areas. These areas are often fragile and are prone to quality problems such as cracks and breakage during subsequent use. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a plastic plate forming device, which solves the problem that most of the existing plastic plate forming devices use suction molding or blow molding to process and form plastic plates, which easily causes the plastic plates to be over-stretched or compressed at the bends of the mold, thereby forming stress concentration areas. These areas are often fragile and prone to quality problems such as cracks and breakage during subsequent use. It also solves the problem that most of the existing plastic plate forming devices are not convenient for workers to disassemble and install plastic plates, which causes workers to spend more time and energy when disassembling and installing plastic plates, which not only reduces production efficiency but also increases labor costs and equipment maintenance costs.

[0005] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: a plastic plate forming device, comprising a processing table, a U-shaped frame and a shaping frame, wherein a No. 1 installation cavity is provided in the middle of the front end outer wall of the processing table, an air pump is provided at the front end of the inner bottom surface of the No. 1 installation cavity, an air inlet of the air pump is fixedly connected to an air inlet pipe, a lower end of the air inlet pipe is fixedly connected to a pipe rack, the lower end of the U-shaped frame is fixedly connected to the processing table, a control panel is fixedly connected to the middle of the outer wall of one side of the U-shaped frame, a No. 2 installation cavity is provided at the upper part of the front end outer wall of the U-shaped frame, a dual-axis synchronous servo motor is provided in the middle of the inner bottom surface of the No. 2 installation cavity, two output shafts of the dual-axis synchronous servo motor are respectively fixedly connected to active shafts, active bevel gears are respectively fixedly connected to the sides of the outer wall of the active shaft away from the dual-axis synchronous servo motor, limiting grooves are respectively provided at the lower parts of the inner walls on both sides of the U-shaped frame, and driving threaded rods are respectively rotatably connected to the middle parts of the inner bottom surfaces of the limiting grooves; The upper ends of the inner walls on both sides of the U-shaped frame are fixedly connected to the mounting frame, and the inner wall of the mounting frame is fixedly connected to the ceramic electric heating plate, and the middle parts of the outer walls on both sides of the shaping frame are respectively fixedly connected to the limiting blocks, and the limiting blocks are respectively threadedly connected to the driving threaded rods, and the limiting blocks are respectively slid inside the limiting grooves, and the bottom surface of the interior of the shaping frame is clamped and connected with the plastic plate workpiece, and the upper end of the inner wall of the shaping frame is clamped and connected with the pressing frame, and the middle parts of the front end and the rear end outer wall of the pressing frame are respectively fixedly connected with wedge blocks, and the middle parts of the outer wall of one side of the wedge block away from the center of the shaping frame are respectively provided with fixing holes, and the middle parts of the front end and the rear end inner wall of the shaping frame are respectively provided with sliding grooves, and the middle parts of the inner wall of one side of the sliding groove away from the center of the shaping frame are respectively threadedly connected with adjusting threaded rods, and the side of the adjusting threaded rod away from the center of the shaping frame is respectively fixedly connected with a knob; Through the above technical scheme, by arranging an adjusting threaded rod fixedly connected with a knob inside the forming frame, a fixed block and a pressure frame for coordinated use, it is convenient for workers to install and disassemble plastic plate workpieces, thereby improving production efficiency and reducing labor costs and equipment maintenance costs.

[0006] Preferably, one side of the adjusting threaded rod close to the center of the shaping frame is rotatably connected with a fixing block, and the fixing blocks are tightly fitted with the fixing holes; Through the above technical solution, it is convenient for the staff to turn the adjusting threaded rod through the knob, so that the adjusting threaded rod pushes the fixed block to move inside the slide groove, so that the fixed block fits tightly with the fixing hole, so that the pressing frame provided with the wedge block cannot move inside the forming frame.

[0007] Preferably, the four corners of the lower surface of the installation frame are respectively provided with limiting holes, the four corners of the upper surface of the shaping frame are respectively fixedly connected with limiting columns, and the limiting columns are respectively connected with the limiting holes by snapping; Through the above technical solution, by using the limiting column and the limiting hole in coordination, it is convenient to ensure the relative position between the installation frame and the shaping frame is accurate, so that the ceramic electric heating plate can preheat and soften the plastic plate workpiece.

[0008] Preferably, a sealing groove is provided in the middle of the upper surface of the processing table, a sealing ring is fixedly connected to the edge of the lower surface of the shaping frame, and the sealing ring is connected to the sealing groove by clamping; Through the above technical solution, a sealed space is formed between the shaping frame and the processing table by using the sealing ring and the sealing groove in combination, so that when the air pump is operated, the preheated and softened plastic plate workpiece can be deformed under the action of air pressure.

[0009] Preferably, the upper ends of the driving threaded rods respectively pass through the limiting grooves and the U-shaped frame to the interior of the second mounting cavity and are fixedly connected with driven bevel gears, and the driven bevel gears are respectively meshed and connected with the driving bevel gears; Through the above technical solution, it is convenient to rotate the driving shaft provided with the driving bevel gear through the dual-axis synchronous servo motor, thereby rotating the driving threaded rod provided with the driven bevel gear.

[0010] Preferably, the middle parts of the inner walls on both sides of the second installation cavity are respectively fixedly connected with auxiliary bearings, and the inner walls of the auxiliary bearings are respectively fixedly connected with the active rotating shaft; Through the above technical solution, the stability of the rotation of the active shaft is improved through the auxiliary bearing.

[0011] Preferably, the four corners of the lower surface of the processing table are respectively fixedly connected with support legs, the center of the upper surface of the processing table is fixedly connected with a forming mold, the middle part of the front end outer wall of the No. 1 installation cavity is fixedly connected with a grid plate through a plurality of bolts, and the middle part of the front end outer wall of the No. 2 installation cavity is fixedly connected with a sealing plate through a plurality of bolts; Through the above technical scheme, the stability of the processing table is improved by the supporting legs, and the load is applied to the plastic plate workpiece through the forming mold, so that the preheated and softened plastic plate workpiece is deformed according to the shape of the mold, thereby obtaining the desired finished product shape, and the grid plate is used to maintain air circulation in the No. 1 installation cavity, so that the air pump can operate normally, and the sealing plate is used to prevent foreign objects from contacting the electrical equipment installed inside the No. 2 installation cavity.

[0012] Preferably, the multiple pipe openings at the upper end of the pipe rack all penetrate the No. 1 installation cavity and the processing table and extend to the upper end of the processing table, and the lower surface of the pressing frame is tightly fitted with the edge of the upper surface of the plastic plate workpiece; Through the above technical solution, air is pumped out from the pipe mouth of the pipe rack through an air pump and discharged from the grid plate, so that the preheated and softened plastic plate workpiece is processed and deformed under the action of air pressure, and the plastic plate workpiece is fixed inside the shaping frame through the pressing frame.

[0013] (III) Beneficial effects The present invention provides a plastic plate forming device having the following beneficial effects: 1. The present invention provides a plastic plate forming device, which is used in conjunction with a movable shaping frame carrying a plastic plate workpiece, a forming mold and an air pump provided with an air inlet pipe and a pipe rack, so that the plastic plate workpiece can be processed and formed by dual methods of vacuum forming and mold pressure, and the plastic plate workpiece can be prevented from being excessively stretched or compressed at the bend of the mold, thereby forming a stress concentration area, thereby improving the strength of the plastic plate workpiece at the bend of the mold and extending the quality of the plastic plate processed and formed products.

[0014] 2. The present invention provides a plastic plate forming device, which facilitates workers to install and disassemble plastic plate workpieces by arranging an adjusting threaded rod fixedly connected to a knob inside the forming frame, a fixed block and a pressure frame for use in combination, thereby improving production efficiency and reducing labor costs and equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention from a first viewing angle; Figure 2 is a schematic diagram of the main structure of the present invention from a second viewing angle; Figure 3 An exploded view of the present invention; Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the structure of the air pump, air intake pipe and pipe rack of the present invention; Figure 6 An exploded view of a local structure of the present invention; Figure 7 It is a partial exploded view of the local structure of the present invention; Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0016] in, 1. Processing table; 2. Support legs; 3. Sealing groove; 4. Forming mold; 5. Installation cavity No. 1; 6. Grid plate; 7. Air pump; 8. Intake pipe; 9. Pipe rack; 10. U-shaped frame; 11. Control panel; 12. Installation cavity No. 2; 13. Sealing plate; 14. Dual-axis synchronous servo motor; 15. Active shaft; 16. Active bevel gear; 17. Auxiliary bearing; 18. Limiting groove; 19. Driving threaded rod; 20. Driven bevel gear; 21. Installation frame; 22. Ceramic heating plate; 23. Limiting hole; 24. Forming frame; 25. Limiting column; 26. Limiting block; 27. Pressing frame; 28. Wedge block; 29. ​​Fixing hole; 30. Plastic plate workpiece; 31. Slide; 32. Adjusting threaded rod; 33. Knob; 34. Fixing block; 35. Sealing ring. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1-8 As shown, an embodiment of the present invention provides a plastic plate forming device, including a processing table 1, a U-shaped frame 10 and a shaping frame 24, a first installation cavity 5 is provided in the middle of the front end outer wall of the processing table 1, an air pump 7 is arranged at the front end of the bottom surface of the first installation cavity 5, an air inlet of the air pump 7 is fixedly connected to an air inlet pipe 8, a lower end of the air inlet pipe 8 is fixedly connected to a pipe rack 9, the lower ends of the U-shaped frame 10 are respectively fixedly connected to the processing table 1, a control panel 11 is fixedly connected to the middle of the outer wall of one side of the U-shaped frame 10, and a control panel 11 is fixedly connected to the front end outer wall of the U-shaped frame 10. A second installation cavity 12 is provided at the upper part of the wall, a dual-axis synchronous servo motor 14 is provided at the middle of the bottom surface of the second installation cavity 12, two output shafts of the dual-axis synchronous servo motor 14 are respectively fixedly connected with a driving shaft 15, and a driving bevel gear 16 is respectively fixedly connected to the outer wall of the driving shaft 15 away from the dual-axis synchronous servo motor 14, and a limiting groove 18 is respectively provided at the lower part of the inner wall on both sides of the U-shaped frame 10, and a driving threaded rod 19 is respectively rotatably connected to the middle of the bottom surface of the limiting groove 18; The upper ends of the inner walls on both sides of the U-shaped frame 10 are fixedly connected with the installation frames 21, and the inner walls of the installation frames 21 are fixedly connected with the ceramic electric heating plates 22. The middle parts of the outer walls on both sides of the shaping frame 24 are fixedly connected with the limit blocks 26, and the limit blocks 26 are respectively threadedly connected with the driving threaded rods 19. The limit blocks 26 slide inside the limit grooves 18, and the bottom surface of the shaping frame 24 is connected with the plastic plate workpiece 30. The upper end of the inner wall of the shaping frame 24 is connected with the pressing frame 27. The middle of the outer wall of the front end and the rear end of the frame 27 are respectively fixedly connected with a wedge block 28, and the middle of the outer wall of the wedge block 28 away from the center of the shaping frame 24 is respectively provided with a fixing hole 29, and the middle of the inner wall of the front end and the rear end of the shaping frame 24 is respectively provided with a slide groove 31, and the middle of the inner wall of the slide groove 31 away from the center of the shaping frame 24 is respectively threadedly connected with an adjusting threaded rod 32, and the side of the adjusting threaded rod 32 away from the center of the shaping frame 24 is respectively fixedly connected with a knob 33; By using a movable shaping frame 24 carrying the plastic plate workpiece 30, a forming mold 3 and an air pump 7 provided with an air inlet pipe 8 and a pipe rack 9, the plastic plate workpiece 30 can be conveniently processed and formed by the dual methods of vacuum forming and mold pressure, preventing the plastic plate workpiece 30 from being excessively stretched or compressed at the bend of the mold, thereby forming a stress concentration area, thereby improving the strength of the plastic plate workpiece 30 at the bend of the mold and extending the quality of the plastic plate processed and molded products.

[0019] One side of the adjusting threaded rod 32 close to the center of the shaping frame 24 is rotatably connected with a fixing block 34, and the fixing blocks 34 are tightly fitted with the fixing holes 29 respectively; It is convenient for the staff to rotate the adjusting threaded rod 32 through the knob 33, so that the adjusting threaded rod 32 pushes the fixing block 34 to move inside the slide groove 31, so that the fixing block 34 fits tightly with the fixing hole 29, so that the pressing frame 27 provided with the wedge block 28 cannot move inside the shaping frame 24.

[0020] The four corners of the lower surface of the installation frame 21 are respectively provided with limiting holes 23, and the four corners of the upper surface of the shaping frame 24 are respectively fixedly connected with limiting posts 25, and the limiting posts 25 are respectively connected with the limiting holes 23 by clamping; By using the limiting column 25 in conjunction with the limiting hole 23 , it is convenient to ensure that the relative position between the installation frame 21 and the shaping frame 24 is accurate, so that the ceramic electric heating plate 22 can preheat and soften the plastic plate workpiece 30 .

[0021] A sealing groove 3 is provided in the middle of the upper surface of the processing table 1, and a sealing ring 35 is fixedly connected to the edge of the lower surface of the shaping frame 24, and the sealing ring 35 is connected to the sealing groove 3 by a clamping connection; By using the sealing ring 35 in conjunction with the sealing groove 3 , a sealed space is formed between the shaping frame 24 and the processing table 1 , so that when the air pump 7 is in operation, the preheated and softened plastic plate workpiece 30 can be processed and deformed under the action of air pressure.

[0022] The upper ends of the driving threaded rods 19 respectively penetrate the limiting grooves 18 and the U-shaped frame 10 to the interior of the second installation cavity 12 and are fixedly connected with the driven bevel gears 20, and the driven bevel gears 20 are respectively meshed and connected with the driving bevel gears 16; It is convenient to rotate the driving shaft 15 provided with the driving bevel gear 16 through the dual-axis synchronous servo motor 14, thereby rotating the driving threaded rod 19 provided with the driven bevel gear 20.

[0023] Auxiliary bearings 17 are fixedly connected to the middle of the inner walls on both sides of the second installation cavity 12, and the inner walls of the auxiliary bearings 17 are fixedly connected to the active shaft 15; The auxiliary bearing 17 improves the rotation stability of the driving shaft 15 .

[0024] The four corners of the lower surface of the processing table 1 are respectively fixedly connected with support legs 2, the center of the upper surface of the processing table 1 is fixedly connected with a forming mold 4, the middle part of the front end outer wall of the No. 1 installation cavity 5 is fixedly connected with a grid plate 6 through a plurality of bolts, and the middle part of the front end outer wall of the No. 2 installation cavity 12 is fixedly connected with a sealing plate 13 through a plurality of bolts; The stability of the processing table 1 is improved by the support legs 2, and a load is applied to the plastic plate workpiece 30 through the forming mold 4, so that the preheated and softened plastic plate workpiece 30 is deformed according to the shape of the mold, thereby obtaining the desired finished product shape, and the grid plate 6 is used to maintain air circulation in the No. 1 installation cavity 5, so that the air pump 7 can operate normally, and the sealing plate 13 is used to prevent foreign objects from contacting the electrical equipment installed inside the No. 2 installation cavity 12.

[0025] The multiple pipe openings at the upper end of the pipe rack 9 all penetrate the No. 1 installation cavity 5 and the processing table 1 and extend to the upper end of the processing table 1. The lower surface of the pressing frame 27 is tightly fitted with the edge of the upper surface of the plastic plate workpiece 30; The air is pumped out from the pipe opening of the pipe rack 9 and discharged from the grid plate 6 by the air pump 7 , so that the preheated and softened plastic plate workpiece 30 is processed and deformed under the action of air pressure, and the plastic plate workpiece 30 is fixed inside the shaping frame 24 by the pressing frame 27 .

[0026] Working principle: When using the plastic plate forming device, first, the plastic plate workpiece 30 is clamped into the interior of the shaping frame 24, and then the pressing frame 27 is clamped into the interior of the shaping frame 24 so that the pressing frame 27 is closely fitted to the plastic plate workpiece 30. Secondly, the adjusting threaded rod 32 is rotated by the knob 33, so that the adjusting threaded rod 32 pushes the fixing block 34 to move inside the slide slot 31, so that the fixing block 34 is closely fitted with the fixing hole 29, so that the pressing frame 27 provided with the wedge block 28 cannot move inside the shaping frame 24. Thirdly, the dual-axis synchronous servo motor 14 is started through the control panel 11 to rotate the active shaft 15 provided with the active bevel gear 16, so that the driven shaft 15 provided with the driven bevel gear 16 is rotated. The driving threaded rod 19 of the bevel gear 20 rotates, so that the limit block 26 moves inside the limit groove 18, so that the shaping frame 24 fits with the mounting frame 21, and the ceramic electric heating plate 22 is started through the control panel 11, and the ceramic electric heating plate 22 preheats and softens the plastic plate workpiece 30. Finally, the air pump 7 is started through the control panel 11. At the same time, the dual-axis synchronous servo motor 14 is started again through the control panel 11 to move the shaping frame 24 downward, so that the sealing ring 35 provided on the shaping frame 24 cooperates with the sealing groove 3 to form a sealed space between the shaping frame 24 and the processing table 1, so that the preheated and softened plastic plate workpiece 30 is processed and deformed under the action of air pressure and pressure from the forming mold 4.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic plate forming device, comprising a processing table (1), a U-shaped frame (10) and a forming frame (24), characterized in that: A first installation cavity (5) is provided in the middle of the front end outer wall of the processing table (1); an air pump (7) is provided at the front end of the bottom surface of the first installation cavity (5); an air inlet of the air pump (7) is fixedly connected to an air inlet pipe (8); a lower end of the air inlet pipe (8) is fixedly connected to a pipe rack (9); the lower ends of the U-shaped frames (10) are respectively fixedly connected to the processing table (1); a control panel (11) is fixedly connected to the middle of the outer wall of one side of the U-shaped frame (10); a second installation cavity (12) is provided at the upper part of the front end outer wall of the U-shaped frame (10); A dual-axis synchronous servo motor (14) is disposed in the middle of the bottom surface of the second installation cavity (12); the two output shafts of the dual-axis synchronous servo motor (14) are respectively fixedly connected to a driving shaft (15); a driving bevel gear (16) is respectively fixedly connected to the outer wall of the driving shaft (15) away from the dual-axis synchronous servo motor (14); limiting grooves (18) are respectively provided at the lower part of the inner walls on both sides of the U-shaped frame (10); and a driving threaded rod (19) is rotatably connected to the middle of the bottom surface of the limiting groove (18); The upper ends of the inner walls on both sides of the U-shaped frame (10) are fixedly connected to mounting frames (21), the inner walls of the mounting frames (21) are fixedly connected to ceramic electric heating plates (22), the middle parts of the outer walls on both sides of the shaping frame (24) are fixedly connected to limiting blocks (26), the limiting blocks (26) are respectively threadedly connected to the driving threaded rods (19), the limiting blocks (26) are respectively slid inside the limiting grooves (18), the bottom surface inside the shaping frame (24) is snap-connected to a plastic plate workpiece (30), and the upper end of the inner wall of the shaping frame (24) is snap-connected to a pressing frame (27) ), the middle parts of the front and rear outer walls of the pressing frame (27) are respectively fixedly connected with wedge blocks (28), the middle parts of the outer walls of the wedge blocks (28) on the side away from the center of the shaping frame (24) are respectively provided with fixing holes (29), the middle parts of the front and rear inner walls of the shaping frame (24) are respectively provided with sliding grooves (31), the middle parts of the inner walls of the sliding grooves (31) on the side away from the center of the shaping frame (24) are respectively threadedly connected with adjusting threaded rods (32), and the side of the adjusting threaded rod (32) away from the center of the shaping frame (24) is respectively fixedly connected with a knob (33).

2. A plastic plate forming device according to claim 1, characterized in that: One side of the adjusting threaded rod (32) close to the center of the shaping frame (24) is rotatably connected to a fixing block (34), and the fixing blocks (34) are tightly fitted with the fixing holes (29).

3. A plastic plate forming device according to claim 1, characterized in that: The four corners of the lower surface of the installation frame (21) are respectively provided with limiting holes (23), the four corners of the upper surface of the shaping frame (24) are respectively fixedly connected with limiting columns (25), and the limiting columns (25) are respectively snap-connected with the limiting holes (23).

4. A plastic plate forming device according to claim 1, characterized in that: A sealing groove (3) is provided in the middle of the upper surface of the processing table (1), and a sealing ring (35) is fixedly connected to the edge of the lower surface of the shaping frame (24), and the sealing ring (35) is snap-connected to the sealing groove (3).

5. A plastic plate forming device according to claim 1, characterized in that: The upper ends of the driving threaded rods (19) respectively penetrate the limiting grooves (18) and the U-shaped frame (10) to the interior of the second mounting cavity (12) and are fixedly connected to the driven bevel gears (20), and the driven bevel gears (20) are respectively meshed and connected to the driving bevel gears (16).

6. A plastic plate forming device according to claim 1, characterized in that: Auxiliary bearings (17) are respectively fixedly connected to the middle of the inner walls on both sides of the second installation cavity (12), and the inner walls of the auxiliary bearings (17) are respectively fixedly connected to the active rotating shaft (15).

7. A plastic plate forming device according to claim 1, characterized in that: The four corners of the lower surface of the processing table (1) are respectively fixedly connected to support legs (2), the center of the upper surface of the processing table (1) is fixedly connected to a forming mold (4), the middle part of the front end outer wall of the No. 1 installation cavity (5) is fixedly connected to a grid plate (6) via a plurality of bolts, and the middle part of the front end outer wall of the No. 2 installation cavity (12) is fixedly connected to a sealing plate (13) via a plurality of bolts.

8. The plastic plate forming device according to claim 1, characterized in that: The plurality of pipe openings at the upper end of the pipe rack (9) all penetrate the No. 1 installation cavity (5) and the processing table (1) and extend to the upper end of the processing table (1), and the lower surface of the pressing frame (27) is tightly fitted to the edge of the upper surface of the plastic plate workpiece (30).

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