Composite material prepreg cutting device and use method thereof

Abstract

A composite material prepreg cutting device and its use method belong to the field of composite material cutting. It comprises a movable device, a control device and a limiting device; the movable device is sleeved on the outside of the control device, and the outside of the control device is movably connected to the limiting device. A slider is fixedly connected to the inner wall of the connecting ring I, which is sleeved on the control device. The upper end of the outer wall of the connecting ring I and the upper end of the inner wall of the rotating ring are both provided with threads, and the two are threadedly connected. A connecting rod II is hinged on the outer circumference of the rotating ring, and the other end of the connecting rod II is hinged to the connecting rod I. The other end of the connecting rod I is hinged to the outer circumference of the fixed ring, and a cutting knife is fixedly connected to the inside of the fixed ring. The present invention can not only complete the straight line and arc cutting required for the cutting of special-shaped prepregs, and is convenient for switching and operation, but also can reduce the relative sliding caused by operational errors during the cutting process, thereby avoiding deviations in the special-shaped parts after cutting and waste of materials.

Description

Technical Field

[0001] The invention relates to a composite material prepreg cutting device and a use method thereof, belonging to the field of composite material cutting. Background Art

[0002] When cutting composite prepregs, special-shaped prepregs require manual operation. During the operation of the current manual cutting tools, the cutting direction of the special-shaped parts needs to be frequently changed, which makes the base of the cutting tool very easy to slide when changing the cutting direction, and causes relative displacement with the prepreg, resulting in a change in the original reference system, which is very likely to cause the special-shaped parts after cutting to fail to meet the requirements. Therefore, it is necessary to improve it. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the background technology and to provide a composite material prepreg cutting device and a method for using the same.

[0004] The present invention achieves the above-mentioned purpose by adopting the following technical solutions:

[0005] A composite material prepreg cutting device comprises a movable device, a control device and a limiting device; the movable device is sleeved on the outside of the control device, and the outside of the control device is movably connected to the limiting device.

[0006] A method for using a composite material prepreg cutting device, the method comprising the following steps:

[0007] Step 1: When a straight line needs to be cut, push the rectangular shell downward so that the rectangular shell is adsorbed on the prepreg through the elastic rubber sleeve, and then push the rectangular block along the direction of the slide on the rectangular shell to drive the cutting knife to perform cutting parallel to the rectangular shell;

[0008] Step 2: Push the pressure plate downward, which drives the pressure rod to push the rectangular rod downward, thereby driving the connecting block close to the surface of the prepreg. Then, rotate the rectangular shell to a predetermined angle, and then press the connecting tube downward to start cutting.

[0009] Step 3: Press the pressure plate downward to push the elastic rubber pad to shrink through the pressure rod, then push the connecting ring I to the upper end of the slide groove, rotate the rotating ring, make the rotating ring rotate downward relative to the connecting ring I, and separate the threads of the two. Then, under the action of gravity, the cutting knife contacts the prepreg and performs arc cutting.

[0010] Compared with the prior art, the beneficial effects of the present invention are: the present invention can not only complete the straight line and arc cutting required for the cutting of special-shaped prepregs, facilitate switching and operation, but also reduce the relative sliding caused by operational errors during the cutting process, thereby avoiding deviation of the special-shaped parts after cutting and waste of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of a composite material prepreg cutting device of the present invention;

[0012] Figure 2 This is a front view of a movable device of a composite material prepreg cutting device of the present invention;

[0013] Figure 3 This is a top view of a movable device of a composite material prepreg cutting device of the present invention;

[0014] Figure 4 This is a schematic structural diagram of a control device and a limiting device of a composite material prepreg cutting device of the present invention;

[0015] Figure 5 This is a front view of a control device for a composite material prepreg cutting device of the present invention;

[0016] Figure 6 This is a front view of a positioning device of a composite material prepreg cutting device of the present invention;

[0017] Figure 7 It is a top view of a connecting block of a composite material prepreg cutting device of the present invention;

[0018] Figure 8 This is a schematic structural diagram of a limiting device of a composite material prepreg cutting device of the present invention;

[0019] Figure 9 This is a top view of a limiting device of a composite material prepreg cutting device of the present invention;

[0020] Figure 10 It is a top view of a sliding block of a composite material prepreg cutting device of the present invention;

[0021] Figure 11 yes Figure 8 Cross-sectional view in the AA direction;

[0022] Figure 12 yes Figure 8 Cross-sectional view in the middle BB direction;

[0023] Figure 13 yes Figure 8 Schematic diagram of the enlarged structure of C in the middle;

[0024] Figure 14 The present invention is a schematic structural diagram of a slide plate and a connecting nozzle of a composite material prepreg cutting device. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Specific implementation method 1: Figure 1-14 As shown, this embodiment describes a composite material prepreg cutting device, including a movable device 1, a control device 2 and a limiting device 3; the movable device 1 is sleeved on the outside of the control device 2, and the outside of the control device 2 is movably connected to the limiting device 3.

[0027] The movable device 1 includes a cutting blade 11, a fixed ring 12, a connecting rod I 13, a connecting rod II 14, a rotating ring 15, a connecting ring I 16, and a slider 17. The slider 17 is fixedly connected to the inner wall of the connecting ring I 16. The connecting ring I 16 is sleeved on the control device 2. The upper end of the outer wall of the connecting ring I 16 and the upper end of the inner wall of the rotating ring 15 are both threaded, and the two are threadedly connected. The outer circumferential surface of the rotating ring 15 is hinged to the connecting rod II 14, and the other end of the connecting rod II 14 is hinged to the connecting rod I 13. The other end of the connecting rod I 13 is hinged to the outer circumferential surface of the fixed ring 12. The cutting blade 11 is fixedly connected to the interior of the fixed ring 12. The upper end surface of the rotating ring 15 is provided with a red pointer mark, and the upper end surface of the connecting ring I 16 is provided with a scale mark indicating the rotation angle.

[0028] The movable device 1 also includes a threaded barrel 18 and a screw 19; one end of the threaded barrel 18 is fixedly connected to the outer circumferential surface of the fixed ring 12, and the threaded barrel 18 is arranged parallel to the connecting rod I 13; one end of the screw 19 is connected to the outer circumferential surface of the rotating ring 15 through a bearing, and the other end of the screw 19 cooperates with the threaded barrel 18 through a thread.

[0029] The control device 2 includes a connecting tube 21, a pressure plate 22, a pressure rod 23, a rectangular rod 26, a cylinder 27 and a positioning device 28; the outer wall of the connecting tube 21 is provided with a vertical groove 24 that slides with the slider 17, and the connecting ring I16 is sleeved on the outer side of the connecting tube 21. The bottom end of the connecting tube 21 is provided with a rectangular hole 25, and the rectangular hole 25 slides with the rectangular rod 26; the lower end of the rectangular rod 26 is fixedly connected to the positioning device 28; the lower end of the pressure plate 22 is fixedly connected to the pressure rod 23, and the pressure rod 23 passes through the upper end of the connecting tube 21 and is located at the upper end of the rectangular rod 26.

[0030] The positioning device 28 includes a connecting block 281, an L-shaped connecting pipe 283, a vertical pipe 286, a limiting ring 287, a connecting ring II 288 and an elastic rubber pad 289; the connecting block 281 is provided with a vertical through hole 282, and the cylinder 27 is fixedly connected to the upper end of the connecting block 281 and communicated with the through hole 282; the side surface of the connecting block 281 and the inner wall of the connecting ring II 288 are both provided with an annular groove, and the inner and outer circumferential surfaces of the limiting ring 287 are respectively connected to the inner and outer circumferential surfaces of the connecting ring II 288. The annular groove on the side of the connecting block 281 and the annular groove on the inner wall of the connecting ring II 288 are slidably matched; the lower end of the connecting ring II 288 is fixedly connected to an elastic rubber pad 289; the elastic rubber pad 289 is provided with a plurality of perforations I 290; the upper end of the limiting ring 287 is fixedly connected to a vertical pipe 286, the vertical pipe 286 is connected to the internal space of the elastic rubber pad 289, and the upper end of the vertical pipe 286 is connected to the vertical end of the L-shaped connecting pipe 283.

[0031] The positioning device 28 also includes a fixed block 284 and an insert block 285. The fixed block 284 is fixedly connected to the side of the L-shaped connecting pipe 283. The fixed block 284 is provided with an insert block 285 that vertically passes through the fixed block 284. The top outer side of the connecting block 281 is provided with a plurality of scale grooves 291. The insert block 285 slidably engages with the scale grooves 291. The lower end of the insert block 285 is provided with inclined surfaces on both sides.

[0032] The limiting device 3 includes a rectangular shell 31, a rectangular block 32, a sliding block 34, a ring 35, an inserting rod 36, an elastic rubber sleeve 37, an elastic sealing pad I 38, a slide plate 39, a connecting nozzle 40 and an elastic sealing pad II 41; the bottom end of the rectangular shell 31 is hollowed out, and the lower end of the rectangular shell 31 is fixedly connected to an elastic rubber sleeve 37 having a circumference equal to its cross section, and the bottom end of the elastic rubber sleeve 37 is provided with a perforation II 43; the bottom end of the rectangular shell 31 is provided with a slideway, and the inner part of the slideway is provided with a hole II 43; A limiting groove is provided on the wall; sliding blocks 34 are fixedly connected to both sides of the rectangular block 32, the rectangular block 32 slides with the slide, the sliding block 34 slides with the limiting groove, a vertical circular hole 33 is provided on the rectangular block 32, and the connecting cylinder 21 is connected to the circular hole 33 through a bearing; an annular groove is also provided at the lower end of the rectangular block 32, and a circular ring 35 is connected to the annular groove through a bearing, and the lower end of the circular ring 35 is fixedly connected to a rod 36 that slides with the cylinder 27; the rectangular An L-shaped connecting hole 42 is provided inside the shell 31, and the vertical end of the connecting hole 42 is connected to the elastic rubber sleeve 37. The horizontal end of the connecting hole 42 passes through the inner wall of the rectangular shell 31, and an elastic sealing gasket II 41 is fixedly connected to the inner wall of the vertical end of the connecting hole 42, and the elastic sealing gasket II 41 is provided with a cross groove 44 passing through the elastic sealing gasket II 41; two vertically arranged elastic sealing gaskets I 38 are fixedly connected to the inner wall of the horizontal end of the connecting hole 42, and a groove for sliding cooperation with the slide plate 39 is also provided on the inner wall of the connecting hole 42, and a connecting hole is provided on the slide plate 39, and a connecting hole is provided on the slide plate 39, and a connecting nozzle 40 is fixedly connected to the end of the slide plate 39 close to the elastic sealing gasket I 38, and the connecting nozzle 40 is located at the connection of the two elastic sealing gaskets I 38, and the connecting nozzle 40 props up the contact position of the two elastic sealing gaskets I 38 and the connecting nozzle 40, so that the connecting nozzle 40 is exposed inside the rectangular shell 31; the horizontal end of the L-shaped connecting pipe 283 is fixedly connected to the connecting nozzle 40.

[0033] The portion of the elastic sealing gasket I 38 that is not connected to the connecting nozzle 40 returns to a vertical state under the action of elasticity, and separates the connecting hole 42 from the interior of the rectangular shell 31 . The connecting hole 42 is only provided on the side panels on both sides along the length direction of the rectangular shell 31 .

[0034] A method for using a composite material prepreg cutting device, the method comprising the following steps:

[0035] Step 1: When a straight line needs to be cut, push the rectangular shell 31 downward so that the rectangular shell 31 is adsorbed on the prepreg through the elastic rubber sleeve 37. Then push the rectangular block 32 along the direction of the upper slide of the rectangular shell 31 to drive the cutting blade 11 to perform cutting work parallel to the rectangular shell 31.

[0036] Step 2: Push the pressing plate 22 downward, which drives the pressing rod 23 to push the rectangular rod 26 downward, thereby driving the connecting block 281 close to the surface of the prepreg. Then, rotate the rectangular shell 31 to a predetermined angle, and then press the connecting tube 21 downward to start cutting.

[0037] Step three, press the pressure plate 22 downward, push the elastic rubber pad 289 to shrink through the pressure rod 23, then push the connecting ring I16 to the upper end of the slide groove 24, rotate the rotating ring 15, make the rotating ring 15 rotate downward relative to the connecting ring I16, and separate the threads of the two, and then make the cutting knife 11 contact the prepreg under the action of gravity and perform arc cutting.

[0038] The working principle of the present invention is as follows: when using the device to cut a straight line, the connecting rods I 13, II 14 and the rectangular shell 31 are adjusted to be perpendicular. When a straight line needs to be cut, the connecting tube 21 is pushed downward, and the connecting tube 21 drives the rectangular shell 31 to move downward through the rectangular block 32 and the sliding block 34. When the elastic rubber sleeve 37 at the lower end of the rectangular shell 31 contacts the prepreg, it continues to apply force downward. The elastic rubber sleeve 37 is deformed by the force, and the air in the elastic rubber sleeve 37 is squeezed into the connecting hole 42. As the elastic rubber sleeve 37 is deformed by the force, the space is reduced and the air pressure is reduced. The cross groove 44 on the elastic sealing gasket II 41 is deformed, so that the air in the elastic rubber sleeve 37 passes through the cross groove 44 and the connecting nozzle 40 into the L-shaped connecting pipe 283 and is discharged through the cylinder 27 and the perforation I 290. After the air pressure returns to normal, the cross groove 44 returns to its original shape under the action of elasticity, separating the upper and lower ends of the elastic sealing gasket II 41. The perforation II 43 at the lower end of the elastic rubber sleeve 37 is pressed against the prepreg under the action of gravity of this device, isolating the elastic rubber sleeve 37 from the outside, and the elastic rubber sleeve 37 is restored to its original shape. The force provided by the elastic force cannot deform the cross groove 44, and the elastic rubber sleeve 37 cannot obtain air from the outside, so the elastic rubber sleeve 37 is adsorbed on the prepreg, driving the cutting knife 11 to perform cutting work parallel to the rectangular shell 31; at the same time, it pushes the connecting tube 21, and the connecting tube 21 drives the movable device 1 to move, thereby causing the cutting knife 11 to cut the prepreg. At the same time, the connecting tube 21 drives the rectangular block 32 to push the rectangular block 32 along the length direction of the slideway on the rectangular shell 31. The connecting tube 21 also drives the positioning device 27 to move together through the rectangular rod 26. Since the L-shaped connecting pipe 283 on the positioning device 27 is fixedly connected to the connecting nozzle 40, it also drives the connecting nozzle 40 to move together. The portion of the elastic sealing gasket I 38 not connected to the connecting nozzle 40 returns to a vertical state under the action of elasticity, so that the upper and lower elastic sealing gaskets I 38 are closely connected, isolating the outside air from entering. The portion of the elastic sealing gasket I 38 in contact with the connecting nozzle 40 is closely connected to the outer wall of the connecting nozzle 40 under the action of elastic force, preventing air from entering from the contact point between the two, thereby isolating the connecting hole 42 from the interior of the rectangular shell 31.

[0039] When the above-mentioned straight line cutting reaches the predetermined position and needs to be changed in direction, the pressing plate 22 is pushed downward, and the pressing plate 22 drives the pressing rod 23 to push the rectangular rod 26 downward, thereby driving the connecting block 281 to approach the surface of the prepreg, and the connecting block 281 drives the limiting ring 287 to move downward, and the limiting ring 287 drives the connecting ring II 288 to move downward, thereby driving the elastic rubber pad 289 to deform. After the elastic rubber pad 289 is deformed, part of the air inside it is squeezed into the connecting hole 42 through the vertical pipe 286, the L-shaped connecting pipe 283, and the connecting nozzle 40, thereby increasing the internal air pressure, thereby deforming the cross groove 44, squeezing the air into the elastic rubber sleeve 37, and restoring the elastic rubber sleeve 37 to its original state. At the same time, the elastic rubber pad 289, under the action of the gravity of this device, makes the perforation I 290 close to the surface of the prepreg and adsorbs , then rotate the rectangular shell 31 to a predetermined angle. The rectangular shell 31 is transparent. During the rotation of the rectangular shell 31, the rectangular shell 31 drives the vertical tube 286 and the L-shaped connecting tube 283 to rotate through the connecting nozzle 40. The connecting tube 21 is manually controlled to prevent it from rotating. The vertical tube 286 rotates to drive the limit plate 287 to rotate. At the same time, the L-shaped connecting tube 283 drives the fixed block 284 and the insert block 285 to rotate. The rotation angle is checked by the cooperation between the insert block 285 and the scale groove 291. After rotating to the predetermined angle (that is, the angle between the center line of the rectangular shell 31 in the longitudinal direction and the cutting line left by the above-mentioned cutting knife 11 reaches the predetermined angle), the connecting tube 21 is pressed downward to make the connecting tube 21 drive the rectangular frame 31 and the elastic rubber sleeve 37 to repeat the above operation and adsorb on the prepreg. Then, the cutting work can be carried out;

[0040] When the cutting angle is 90°, the above angle adjustment operation is not required. The screw 19 is rotated to shorten the total length of the threaded barrel 18 and the screw 19, and the hinge at the connecting rod I 13 and the connecting rod II 14 is moved upward, thereby shortening the total length of the connecting rod I 13 and the connecting rod II 14, so that the cutting knife 11 cuts perpendicularly to the aforementioned cutting line.

[0041] When arc cutting is required, the above-mentioned angle adjustment operation is performed, the elastic rubber pad 289 is adsorbed on the prepreg, and then the connecting ring I 16 is lifted upward, and the rotating ring 15 is rotated to move the rotating ring 15 downward to disengage the threaded connection with the connecting ring I 16, but the connecting ring 15 is still located inside the connecting ring I 16. Then, the cutting knife 11 is placed on the prepreg again, and the connecting rods I 13 and II 14 are pushed to drive the cutting knife 11 to perform arc cutting;

[0042] When the radius of the arc cutting needs to be adjusted, the elastic rubber pad 289 is adsorbed on the prepreg, and the distance between the cutting blade 11 and the connecting tube 21 is adjusted by the screw 19 and the threaded cylinder 18. Then, the rectangular shell 31 is rotated to a certain angle, and the elastic rubber sleeve 37 at its lower end is adsorbed on the prepreg. Then, the connecting tube 21 is pushed along its length direction to move the connecting tube 21 to the center of the arc cutting circle. Finally, the pressing plate 22 is pushed downward to adsorb the elastic rubber pad 289 on the prepreg, and the cutting blade 11 is pushed to cut.

[0043] After use, the elastic rubber pad 289 is adsorbed on the prepreg, and then the connecting tube 21 is pulled upward. The connecting tube 21 drives the rectangular shell 31 to move upward and then drives the insertion rod 36 to move upward, so that the cylinder 27 is connected to the outside world, and the elastic rubber pad 289 is restored to its original state.

[0044] During the above-mentioned cutting process, the elastic rubber pad 289 and the elastic rubber sleeve 37 are alternately adsorbed on the prepreg, which can avoid the device sliding relative to the prepreg due to operational errors during adjustment and operation, thereby avoiding the trouble of needing to re-determine the fixed position.

Claims

1. A composite material prepreg cutting device, characterized in that: It comprises a movable device (1), a control device (2) and a limiting device (3); the movable device (1) is sleeved on the outside of the control device (2), and the outside of the control device (2) is movably connected to the limiting device (3); The movable device (1) comprises a cutting knife (11), a fixed ring (12), a connecting rod I (13), a connecting rod II (14), a rotating ring (15), a connecting ring I (16) and a slider (17); the slider (17) is fixedly connected to the inner wall of the connecting ring I (16), the connecting ring I (16) is sleeved on the control device (2), the upper end of the outer wall of the connecting ring I (16) and the upper end of the inner wall of the rotating ring (15) are both provided with threads, and the two are threadedly connected, the outer circumferential surface of the rotating ring (15) is hinged with the connecting rod II (14), the other end of the connecting rod II (14) is hinged with the connecting rod I (13), the other end of the connecting rod I (13) is hinged to the outer circumferential surface of the fixed ring (12), and the interior of the fixed ring (12) is fixedly connected with the cutting knife (11); The movable device (1) further comprises a threaded barrel (18) and a screw (19); one end of the threaded barrel (18) is fixedly connected to the outer circumference of the fixed ring (12), and the threaded barrel (18) is arranged parallel to the connecting rod I (13); one end of the screw (19) is connected to the outer circumference of the rotating ring (15) through a bearing, and the other end of the screw (19) is engaged with the threaded barrel (18) through a thread.

2. The composite material prepreg cutting device according to claim 1, characterized in that: The control device (2) comprises a connecting tube (21), a pressure plate (22), a pressure rod (23), a rectangular rod (26), a cylinder (27) and a positioning device (28); the outer wall of the connecting tube (21) is provided with a vertical groove (24) that is slidably engaged with the slider (17); the connecting ring I (16) is sleeved on the outer side of the connecting tube (21); the bottom end of the connecting tube (21) is provided with a rectangular hole (25), and the rectangular hole (25) is slidably engaged with the rectangular rod (26); the lower end of the rectangular rod (26) is fixedly connected to the positioning device (28); the lower end of the pressure plate (22) is fixedly connected to the pressure rod (23), and the pressure rod (23) penetrates from the upper end of the connecting tube (21) and is located at the upper end of the rectangular rod (26).

3. The composite material prepreg cutting device according to claim 2, characterized in that: The positioning device (28) includes a connecting block (281), an L-shaped connecting pipe (283), a vertical pipe (286), a limiting ring (287), a connecting ring II (288) and an elastic rubber pad (289); a vertical through hole (282) is provided on the connecting block (281), and the cylinder (27) is fixedly connected to the upper end of the connecting block (281) and communicated with the through hole (282); an annular groove is provided on the side surface of the connecting block (281) and the inner wall of the connecting ring II (288), and the inner and outer circular surfaces of the limiting ring (287) are They are respectively slidably matched with the annular groove on the side of the connecting block (281) and the annular groove on the inner wall of the connecting ring II (288); the lower end of the connecting ring II (288) is fixedly connected to an elastic rubber pad (289); the elastic rubber pad (289) is provided with a plurality of perforations I (290); the upper end of the limiting ring (287) is fixedly connected to a vertical pipe (286), the vertical pipe (286) is communicated with the internal space of the elastic rubber pad (289), and the upper end of the vertical pipe (286) is communicated with the vertical end of the L-shaped connecting pipe (283).

4. The composite material prepreg cutting device according to claim 3, characterized in that: The positioning device (28) further comprises a fixed block (284) and an insert block (285); the fixed block (284) is fixedly connected to the side of the L-shaped connecting pipe (283); the fixed block (284) is provided with an insert block (285) vertically passing through the fixed block (284); a plurality of scale grooves (291) are provided on the outer side of the top end of the connecting block (281); the insert block (285) is slidably engaged with the scale grooves (291).

5. The composite material prepreg cutting device according to claim 4, characterized in that: The limiting device (3) comprises a rectangular shell (31), a rectangular block (32), a sliding block (34), a circular ring (35), an inserting rod (36), an elastic rubber sleeve (37), an elastic sealing pad I (38), a slide plate (39), a connecting nozzle (40) and an elastic sealing pad II (41); the bottom end of the rectangular shell (31) is hollowed out, the lower end of the rectangular shell (31) is fixedly connected to an elastic rubber sleeve (37) having a circumference equal to the cross-section thereof, and the bottom end of the elastic rubber sleeve (37) is provided with a perforation II (43); the bottom end of the rectangular shell (31) is provided with a slideway , a limiting groove is provided on the inner wall of the slide; sliding blocks (34) are fixedly connected to both sides of the rectangular block (32), the rectangular block (32) slides with the slide, and the sliding block (34) slides with the limiting groove. A vertical circular hole (33) is provided on the rectangular block (32), and the connecting cylinder (21) is connected to the circular hole (33) through a bearing; an annular groove is also provided at the lower end of the rectangular block (32), and a circular ring (35) is connected to the annular groove through a bearing, and the lower end of the circular ring (35) is fixedly connected to a plug rod (36) that slides with the cylinder (27); the An L-shaped communicating hole (42) is provided inside the rectangular shell (31), the vertical end of the communicating hole (42) is communicated with the elastic rubber sleeve (37), the horizontal end of the communicating hole (42) passes through the inner wall of the rectangular shell (31), and an elastic sealing gasket II (41) is fixedly connected to the inner wall of the vertical end of the communicating hole (42), and a cross groove (44) is provided on the elastic sealing gasket II (41) that passes through the elastic sealing gasket II (41); two vertically arranged elastic sealing gaskets I (38) are fixedly connected to the inner wall of the horizontal end of the communicating hole (42), and a cross groove (44) is provided on the elastic sealing gasket II (41) that passes through the elastic sealing gasket II (41); two vertically arranged elastic sealing gaskets I (38) are fixedly connected to the inner wall of the horizontal end of the communicating hole (42), and a cross groove (44) is provided on the elastic sealing gasket II (41) that passes through the elastic sealing gasket II (41) ) is also provided on the inner wall of the slide plate (39), and a connecting hole is provided on the slide plate (39), and a connecting nozzle (40) is fixedly connected to one end of the slide plate (39) close to the elastic sealing gasket I (38), and the connecting nozzle (40) is located at the connection between the two elastic sealing gaskets I (38), and the connecting nozzle (40) supports the contact position between the two elastic sealing gaskets I (38) and the connecting nozzle (40), so that the connecting nozzle (40) is exposed inside the rectangular shell (31); the horizontal end of the L-shaped connecting pipe (283) is fixedly connected to the connecting nozzle (40).

6. The composite material prepreg cutting device according to claim 5, characterized in that: The portion of the elastic sealing gasket I (38) not connected to the connecting nozzle (40) is restored to a vertical state under the action of elasticity, and separates the communicating hole (42) from the interior of the rectangular shell (31).

7. The method for using the composite material prepreg cutting device according to claim 6, characterized in that: The method of use comprises the following steps: Step 1: When a straight line needs to be cut, the rectangular shell (31) is pushed downward so that the rectangular shell (31) is adsorbed on the prepreg through the elastic rubber sleeve (37), and then the rectangular block (32) is pushed along the direction of the upper slide of the rectangular shell (31) to drive the cutting knife (11) to perform cutting work parallel to the rectangular shell (31); Step 2: Push the pressing plate (22) downward, the pressing plate (22) drives the pressing rod (23) to push the rectangular rod (26) downward, thereby driving the connecting block (281) close to the surface of the prepreg, and then rotating the rectangular shell (31) to a predetermined angle, and then pressing the connecting tube (21) downward to perform the cutting operation; Step three, press the pressure plate (22) downward, push the elastic rubber pad (289) to shrink through the pressure rod (23), and then push the connecting ring I (16) to the upper end of the slide groove (24), rotate the rotating ring (15), so that the rotating ring (15) rotates downward relative to the connecting ring I (16), and separates the threads of the two, and then under the action of gravity, the cutting knife (11) contacts the prepreg and performs arc cutting.

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